In the context of the recent relaxation of epidemic prevention and control, many netizens have posted messages asking Guona Technology Sauce "What kind of air purifier do we need in the post-epidemic era?" We hope that as veterans of the air purification industry, we can give professional answers to this question. Moreover, judging from the gradual increase in readings of Guona Technology Sauce's articles on air purifiers in the early stage, " post-epidemic era, how to choose an air purifier and what kind of air purifier to choose? " has become a topic of widespread concern, so I feel the need to write a systematic summary.
There are many answers to this question online, but they are not systematic and in-depth enough. Many netizens are often confused after reading them. In this regard, based on its many years of experience in the industry, Guona Technology Sauce hopes that this article can give you some more objective and professional answers. However, due to my limited level, there may still be some shortcomings. I hope you can help correct me. This article is mainly aimed at the current situation when the epidemic situation is relaxed and the haze is coming. In addition to being more concerned about the removal of particulate matter and odor removal by air purifiers, they are also very concerned about the new crown aerosol processing capabilities of air purifiers. Therefore, based on the previous creation, here is a systematic introduction to Why the new coronavirus will not be eradicated, the composition of traditional air purifiers, the key points of selecting traditional air purifiers, the shortcomings of traditional air purifiers, new anti-viral materials, anti-viral filters and the air purifiers we need in the post-epidemic era are comprehensively elaborated on seven topics that everyone is more concerned about.
Finally, combined with actual cases obtained from his own industry experience, he recommended several air purifiers that are suitable for today.
The new coronavirus will be with us for a long time
When the new coronavirus became pandemic in early 2020, Jesse Bloom, an evolutionary biologist at the Fred Hutchinson Cancer Research Center in Seattle, Washington, looked at the future of the new coronavirus. Like many virology experts, he predicts that the COVID-19 pathogen will not be eradicated. Instead, he believes that in the long term, COVID-19 will become the fifth coronavirus to permanently exist in humans. Like the other four "seasonal" coronaviruses (these four coronaviruses are HCoV-229E, HCoV-OC43, HCoV-NL63, and HCoV-HKU1), SARS-CoV-2 will give us cold-like symptoms and may spread among humans for decades or longer. For this article, you can participate in the article of Guona Technology Sauce - "
Jesse Bloom believes that studying "seasonal" coronaviruses may provide a roadmap for the evolution and pandemic of the new coronavirus. The best example is a seasonal coronavirus called 229E (HCoV-229E is a type of coronavirus that is less pathogenic and generally causes respiratory symptoms, similar to a common cold). This virus will cause us to be infected repeatedly throughout our lives.
In order to understand why 229E "entangles" us for a long time, is it because the immune response of the human host is weakened? Or does the virus evolve itself to evade and become immune to ? Jesse Bloom's team collected decades of blood samples from people who may have been exposed to 229E and tested their antibodies against different versions of the virus in the 1980s. The results were surprising: Blood samples from the 1980s contained high levels of antibodies against the 1984 version of 229E, but these antibodies were not effective against the 1990s virus. The neutralizing ability is much smaller, and the ability to neutralize the 229E variant from the 2000s and 2010s is even more minimal; the same is true for blood samples from the 1990s. People have immunity to recent viruses, but not to future viruses, which fully demonstrates that viruses are evolving to evade immunity.
Regarding the new coronavirus, Jesse Bloom’s team spent nearly two years observing its evolution, and they concluded that the new coronavirus has obvious similarities with 229E. An obvious example is that the mutations carried by the early delta virus and the recent Omicron virus significantly weakened the effectiveness of antibodies against past versions of the new coronavirus.
In the context of the recent relaxation of epidemic prevention and control, many netizens have posted messages asking Guona Technology Sauce "What kind of air purifier do we need in the post-epidemic era?" We hope that as veterans of the air purification industry, we can give professional answers to this question. Moreover, judging from the gradual increase in readings of Guona Technology Sauce's articles on air purifiers in the early stage, " post-epidemic era, how to choose an air purifier and what kind of air purifier to choose? " has become a topic of widespread concern, so I feel the need to write a systematic summary.
There are many answers to this question online, but they are not systematic and in-depth enough. Many netizens are often confused after reading them. In this regard, based on its many years of experience in the industry, Guona Technology Sauce hopes that this article can give you some more objective and professional answers. However, due to my limited level, there may still be some shortcomings. I hope you can help correct me. This article is mainly aimed at the current situation when the epidemic situation is relaxed and the haze is coming. In addition to being more concerned about the removal of particulate matter and odor removal by air purifiers, they are also very concerned about the new crown aerosol processing capabilities of air purifiers. Therefore, based on the previous creation, here is a systematic introduction to Why the new coronavirus will not be eradicated, the composition of traditional air purifiers, the key points of selecting traditional air purifiers, the shortcomings of traditional air purifiers, new anti-viral materials, anti-viral filters and the air purifiers we need in the post-epidemic era are comprehensively elaborated on seven topics that everyone is more concerned about.
Finally, combined with actual cases obtained from his own industry experience, he recommended several air purifiers that are suitable for today.
The new coronavirus will be with us for a long time
When the new coronavirus became pandemic in early 2020, Jesse Bloom, an evolutionary biologist at the Fred Hutchinson Cancer Research Center in Seattle, Washington, looked at the future of the new coronavirus. Like many virology experts, he predicts that the COVID-19 pathogen will not be eradicated. Instead, he believes that in the long term, COVID-19 will become the fifth coronavirus to permanently exist in humans. Like the other four "seasonal" coronaviruses (these four coronaviruses are HCoV-229E, HCoV-OC43, HCoV-NL63, and HCoV-HKU1), SARS-CoV-2 will give us cold-like symptoms and may spread among humans for decades or longer. For this article, you can participate in the article of Guona Technology Sauce - "
Jesse Bloom believes that studying "seasonal" coronaviruses may provide a roadmap for the evolution and pandemic of the new coronavirus. The best example is a seasonal coronavirus called 229E (HCoV-229E is a type of coronavirus that is less pathogenic and generally causes respiratory symptoms, similar to a common cold). This virus will cause us to be infected repeatedly throughout our lives.
In order to understand why 229E "entangles" us for a long time, is it because the immune response of the human host is weakened? Or does the virus evolve itself to evade and become immune to ? Jesse Bloom's team collected decades of blood samples from people who may have been exposed to 229E and tested their antibodies against different versions of the virus in the 1980s. The results were surprising: Blood samples from the 1980s contained high levels of antibodies against the 1984 version of 229E, but these antibodies were not effective against the 1990s virus. The neutralizing ability is much smaller, and the ability to neutralize the 229E variant from the 2000s and 2010s is even more minimal; the same is true for blood samples from the 1990s. People have immunity to recent viruses, but not to future viruses, which fully demonstrates that viruses are evolving to evade immunity.
Regarding the new coronavirus, Jesse Bloom’s team spent nearly two years observing its evolution, and they concluded that the new coronavirus has obvious similarities with 229E. An obvious example is that the mutations carried by the early delta virus and the recent Omicron virus significantly weakened the effectiveness of antibodies against past versions of the new coronavirus.At a time when much of the planet has acquired immunity to the virus through infection, vaccination or both, the rapid rise of Omicron in South Africa suggests that this new coronavirus variant has found a way to evade human immunity. We can also expect that subsequent mutations of the new coronavirus will only become more powerful, and the next generation of variants that can surpass the Omicron virus may be on the way, right?
Regardless, how the coronavirus evolves in the coming months and years will determine the outcome of this global crisis: Will the virus evolve into another common cold? Or will it evolve into a more threatening disease? It seems difficult to say at the moment. We can only say that we hope that the new coronavirus will eventually evolve into a common cold, but no matter what, it seems that it will follow us like a shadow.
Through long-term observation, Guona Technology Jiang strongly agreed with Jesse Bloom’s point of view in December last year. The new coronavirus may become normalized, and we have to be mentally prepared. Now it seems that Jesse Bloom’s point of view is completely correct. The new coronavirus is becoming normal, just like the cold.
The composition of traditional air purifiers
Now, we already know that the new coronavirus has been with us like a cold, so what can we do about it? Guona Technology Jiang believes that in addition to wearing masks and washing hands and disinfecting frequently, it is necessary for us to be equipped with anti-viral air purifiers in some relatively closed places, or places or seasons where ventilation is inconvenient. It can not only remove particles in the air, remove odors in the air, but also remove the new coronavirus existing in aerosols at the same time. It can be said to serve multiple purposes.
Here, let’s first look at the composition of a traditional air purifier. Obviously, its composition is not complicated. It consists of six parts: appearance design, structural design, filter module, fan module and operating system. For details, please see the article of Guona Technology Sauce - "
1, appearance design Design: The appearance designs of air purifiers can be described as diverse, with the main shapes being cylindrical, square, and flat; the design styles mainly include industrial style, simple style, and artistic style; the shell design can also be divided into metal and engineering plastic ; Guona Technology Jiang believes that the appearance only needs to be consistent with the home decoration style, and there is no need to be too entangled.
2. Structural design: The structural design of air purifiers mainly includes three structures: tower type, filter cartridge type and plate type. Among them, the tower type structure has the highest space utilization when the filters are stacked layer by layer. The filter cartridge type structure uses the Archimedes spiral air duct to be quieter and more energy-saving. The plate type generally has small air intake machines on both sides. Guona Technology Jiang believes that the tower type and filter cartridge type are both good choices.
3. Filter module: core accessory of air purifier. Filters on the market mainly include HEPA, activated carbon, photocatalyst , UVC, electrostatic dust collection, etc. Among them, HEPA is used to filter large particles, and activated carbon is used to absorb Attached are formaldehyde and other gaseous pollutants. Photocatalyst is used to decompose formaldehyde and other gaseous pollutants. UVC is mainly used for air disinfection. Electrostatic dust collection mainly processes particulate matter through high-voltage electrostatic mode. Guona Technology Jiang believes that the traditional composite filter module is actually a good choice. It is stable, reliable and efficient.
4. Fan module: Noise is closely related to another core component of the air purifier - the fan unit and noise reduction measures. No matter what, everyone always hopes that the noise of the equipment will be as small as possible so that we can enjoy a comfortable life. Guona Technology Jiang believes that the fan is the core component related to the life of the air purifier. If conditions permit, you can choose imported fans or fans from domestic high-quality manufacturers.
5, sensing module: sensor module, just like our eyes, in addition to conventional temperature and humidity, it can also accurately tell us the current air particle content, formaldehyde concentration, and volatile organic compound concentration, and then intelligently control the air purifier to maximize the role of the air purifier. It can also inform us of the usage status of the filter element module. Guona Technology Jiang believes that the sensor is often a part that people tend to ignore. In fact, special attention should be paid to it, which will have a great impact on the actual experience in the later period.
6. Operating system: Intelligent operating systems are the general trend. Air purifiers that only operate on the panel are outdated. Guona Technology Jiang believes that a good air purifier must be equipped with an easy-to-operate mobile APP. In this way, the purification equipment can be automatically turned on half an hour before we go home. Home is a clean and warm home, just waiting for the owner to return, but for traditional families.
Key points for selecting traditional air purifiers
After understanding the composition of traditional air purifiers, let’s take a look at the performance and price of air purifiers and other topics that everyone is most concerned about. Because regardless of the composition of the air purifier, in the end everyone still has to look at the core performance of the air purifier that must be paid attention to, and whether it is worth buying. Here is the analysis:
1, CARD value: The CADR value refers to the clean air output ratio of the air purifier, which is the volume of air purified in one hour. Obviously, the higher the CARD value, the greater the purification speed, the higher the purification efficiency, and the larger the purification space of the air purifier. According to "Air Purifier" (GB/T) 18801-2015), the room area that can be purified = CADR value × coefficient (0.07~0.12). Guona Technology Jiang believes that the bigger the better, the CARD value should match the size of the room. Don’t blindly pursue this value when choosing.
2, CCM value: CCM value refers to the total amount of pollutants purified by the air purifier, which is divided into four levels: P1, P2, P3, and P4. The higher the value, the higher the level, and the longer the service life of the filter. Guona Technology Jiang believes that the size of the CCM value is related to the service life of the core components of the air purifier, and is also related to our later use and maintenance costs. Everyone must pay attention to it.
3. Digital display of air quality: In addition to the purification, antibacterial and anti-viral capabilities of air purifiers, we must also pay attention to whether air quality is digitally displayed. This often leads to the public wondering, "After having an air purifier, has the air quality at home improved, and how much has it improved?" Guona Technology Jiang believes that if air purification equipment manufacturers cannot solve this problem well, it will lead to a lack of public trust and the future development of the industry will be restricted.
4. Price positioning: The price positioning of air purifiers is also a very important factor. Foreign brands generally take the high-end route; domestic brands generally take the cost-effective route, and a small number of them take the high-end route. Guona Technology Jiang believes that no matter which route it is, we can choose. As the saying goes, the one that suits you is the best, isn't it?
The shortcomings of traditional air purifiers
It is undeniable that traditional air purifiers provide the possibility to improve people's home and office environment. They can remove particulate matter in the air and also remove odors in the air, such as formaldehyde, TVOC, etc. However, is still slightly inferior to in the face of the new crown aerosols that normally exist in the air during the new crown epidemic. Why do you say this? This is analyzed from the particle removal mechanism of the traditional air purifier HEPA filter.
HEPA filter is a filter material made of fiber as the base material, or a composite fiber filter material interwoven with several fibers, or fiber is directly used as the filter material. Its main filtration mechanism includes: interception effect, inertia effect, diffusion effect, gravity effect, and electrostatic effect, which are explained here respectively. As follows:
- interception effect: When particles of a certain size move along streamlines near the fiber surface, if the distance from the center of the particle to the fiber surface is less than or equal to the radius of the particle, the particles will be intercepted and deposited on the fiber surface (the fibers are intricately arranged to form countless grids).
- Diffusion effect: Particles in the air with a particle size less than 1.0um will follow the air flow and undergo irregular Brownian motion; the smaller the particles, the more intense the Brownian motion. At normal temperature, the molecular diffusion distance of particles with a particle size of 0.1um can reach 17um per second, which is several times larger than the spacing between fibers. This gives the particles more opportunity to move to the fiber surface and attach to the fiber. The smaller the particles and the lower the filtration speed, the more significant the diffusion effect will be.Particles smaller than 0.1um mainly undergo Brownian motion, and the smaller they are, the easier they are to be removed; particles larger than 0.5um mainly undergo inertial motion, and the larger they are, the easier they are to be removed; therefore, particles between 0.1~0.5um have neither obvious diffusion nor inertial effects, making them more difficult to remove.
- Inertia effect: When particles pass through the intricately arranged fiber layer with the air flow (fluid), their streamlines will make multiple turns. When the particle particle is larger or faster, when the particle turns on the streamline, due to its inertia, the particle has no time to follow the streamline and bypass the fiber, so it breaks away from the streamline, approaches the fiber, and collides with the fiber to be deposited.
- Gravity effect: When moving particles pass through the filter fiber layer, they are displaced from their streamlines under the action of gravity and settle to the fiber surface. This gravity settling effect is only effective for larger particles with a particle size greater than 0.5um. Because small particles with a particle size less than 0.5um are less affected by gravity, they have already passed through the fiber layer with the air flow before settling on the fiber surface. Therefore, for particles with a particle size less than 0.5um, the gravity settling effect can be ignored.
- Electrostatic effect: When particles in the air pass through the fiber filter layer, due to friction and other reasons, both the fibers and the particles may be charged, creating an electrostatic effect that attracts the particles. However, in addition to intentionally charging the fibers and particles, if the fiber surface is charged due to friction and other effects during fiber processing, or the fiber surface is charged due to particle induction, the charge exists for a short time, and its electric field strength is also very small, and the gravitational force generated is very small and can be ignored.
It can be seen from the particle removal mechanism of the above HEPA filter that no matter what effect it is, it only intercepts and adsorbs the new coronavirus aerosol in the air. The hidden dangers have not been eliminated, and there is still a great risk of becoming a secondary pollution source. Therefore, we need to upgrade this traditional HEPA filter so that it can not only intercept aerosols containing the new coronavirus, but also inactivate the bacterial virus , thereby eliminating hidden dangers. If it can be realized, this will be a revolutionary change in traditional air purification filters. This is not an easy task and requires the support of materials scientists.
New Anti-Virus Materials
To realize the innovation of traditional HEPA filters, the participation of material scientists is required. In fact, Professor Huang Jiaxing of West Lake University is also working hard in the "
materials science industry. As early as February last year, good news came from Shanghai Juzhi New Material Technology Co., Ltd.: After several months of hard work, researchers developed a A new type of graphene-based composite anti-viral material has been successfully mass-produced, with a killing rate of 99% against the new coronavirus. For details, please refer to this article by Guona Technology Sauce - "
- "Capture": Graphene's special energy band structure and composite materials The semiconductor properties of the material , the inner cavity has a bipolar electric field effect, and it is easy to capture bacteria and viruses
- "kill": trigger ROS, produce high reactive oxygen species , other ions and free radicals adhere to the virus surface, destroy the structure and function of viral proteins and nucleic acids, the contact catalytic antibacterial and antiviral mechanism can quickly inactivate the captured bacteria and viruses
The graphene antiviral material project has a technically strong R&D team: it is based on the Solid State Ion and New Energy Materials Laboratory of the State Key Laboratory of Materials and Chemical Engineering of Nanjing University of Technology, led by Dr. Zhang Chunming, Shanghai Jiao Tong University Researcher Xiong Dingbang is the material consultant, and several doctors and masters in related fields are the backbone. This new graphene composite anti-viral material developed and mass-produced has passed the testing of ISO 18184-2019 and ISO 21702-2019 international standards. It can effectively resist a variety of viruses, bacteria and fungi, and establish a strong health protection shield. Related technologies have applied for more than 610 national invention patents.The products of this project and its downstream derivatives have been tested by third-party testing institutions such as Guangdong Microbial Analysis and Testing Center, Shanghai Microspectrum Chemical Industry, Beijing Gyeonggi Analysis and Testing Center, and Shanghai Huati Label Testing. The virus killing rate is:
- COVID -19：＞99%
- H3N2：＞99%
- H1N1：＞99.9%
After high temperature resistance, water washing resistance, nanometerization and broad-spectrum antibacterial tests, it shows that graphene antiviral materials have broad market application prospects:
- can withstand high temperatures: has passed 260℃ long-term processing and production tests
- can withstand water washing: has been washed 30 times and tested
- can be nanosized: has been made into a transparent AG anti-glare coating
- can be broad-spectrum antibacterial and antiviral: has been tested Through novel coronavirus, H1N1, H3N2, E. coli , Staphylococcus aureus , Pseudomonas aeruginosa , Candida albicans , fungi, etc.
The application development and layout of this material has been carried out in the fields of disinfection, protection, construction, textile, plastics, medical treatment, etc. It is expected that the application products that can be developed will be very wide, and the target market size will reach about 200 billion yuan. According to Dr. Zhang Chunming, the company's existing application product forms are mainly divided into graphene composite anti-viral powder, graphene composite anti-viral slurry and graphene composite anti-viral masterbatch:
1, graphene composite anti-viral powder
product form is powder, white, light gray or brown (different raw material ratios, used (different scenarios with color requirements), is the source of all subsequent applications, and can be used to prepare anti-viral fibers and fabrics such as melt-blown fabrics , non-woven fabrics, and printed fabrics, anti-viral coatings, anti-viral injection molded parts, anti-viral films, etc. Tested by a third-party testing agency, Shanghai Micropu Chemical Technology Service Co., Ltd., it has an anti-viral activity rate of >99% for the new coronavirus COVID-19.
2, graphene composite anti-virus slurry
- anti-virus white oil slurry for special fiber : in the field of safety protection, protective gloves and fabrics have been made in the field of special ultra-high molecular weight polyethylene fiber, and have been tested by third parties The Guangdong Microbiological Analysis and Testing Center tested the killing rate test and water-washing resistance test of H3N2, E. coli, Staphylococcus aureus and other bacteria and viruses, and achieved >99% killing data, and has passed the export certification
- water-based anti-viral slurry for post-finishing fabrics: In the field of apparel fabrics, 2.2-meter width 100 has been tested on a small scale The 0-meter-long printed fabric sample was tested by the third-party testing agency Huati Testing and Certification Group Co., Ltd. . It has good water resistance and antibacterial rate against Staphylococcus aureus (before and after 10 times of washing, the antibacterial effect has not been attenuated, >99%). It is expected to be applied to clothing fabrics
- special glass coating water-based and alcohol-based antiviral slurry: mainly used in mobile phones, computers, vehicle-mounted monitors, etc.
- medical devices coating water-based and alcohol-based antiviral slurry: In the field of medical devices, normal medical devices require routine sterilization and sterilization operations. This antiviral coating can maintain the sterility of the device surface and has a broad application space. Tested by a third-party testing agency, the Beijing Gyeonggi Analysis and Testing Center, the antiviral activity rate against the new coronavirus COVID-19 is >99%
3. Graphene composite antiviral masterbatch
- Personal and medical protection: In the field of medical protection, the antiviral, antibacterial and filtration efficiency tests of meltblown cloth and masks have been completed, and all have reached product listing standards.The melt-blown cloth developed has been tested by the third-party testing agency Huati Testing and the Beijing Gyeonggi Analysis and Testing Center. The antiviral activity rate against pathogens such as COVID-19, E. coli, and Staphylococcus aureus is >99%
- Air conditioning and fresh air system for closed and semi-enclosed spaces : In the field of building protection, the anti-virus filter element can be applied to various closed/semi-enclosed spaces
- Special plastic injection molding parts: In the field of precision optics, KL Optics has been used in special applications This graphene composite antiviral masterbatch is added to lenses and frames, and the antiviral activity rate against the new coronavirus COVID-19 is close to 99%.
- Cold chain packaging film: In the packaging field, we are working with downstream companies to verify that the antiviral factors in packaging products can kill or inhibit viruses at low temperatures. Production effect
It can be said that the advent of this graphene anti-virus material provides us with a good idea to solve the anti-virus problem of HEPA filters, but there is still one step left, that is, to integrate this material into the traditional HEPA filter. Can it be achieved?
anti-virus filter
Just when we were worried about whether the graphene anti-viral material developed by Juzhi could be smoothly integrated into the HEPA filter, after more than 5 months of hard work by scientific researchers, Juzhi (Suzhou) Nanotechnology Co., Ltd. located in Suzhou Industrial Park successfully developed a graphene composite antibacterial and antiviral filter element. This solution may have been the first in the world at the time. For details, see this article from Guona Technology Sauce - "
Guona Technology Sauce believes that the release of this solution will add new solutions and new options to improve the safety of public places, especially places with large flow of people and relatively closed places. It is a major event in the field of health and cleanliness:
- Compared with traditional ultraviolet antibacterial and antiviral solutions, the advantages of this graphene composite antibacterial and antiviral filter solution are very obvious: no need for electricity, more energy-saving, no ozone release, more environmentally friendly
- Compared with traditional filter elements, this solution incorporates antibacterial and antiviral functions, achieving the purpose of one core with multiple uses. Users only need to replace the filter element regularly to get a safer, cleaner and healthier living environment.
- Compared with filter elements with antibacterial functions on the market, this solution is not a simple coating or spraying, but is fully integrated into the filter element. It has obvious weather resistance advantages and does not have obvious problems such as unevenness and shedding. 5
- Importantly, the source of the material used in this filter element is neither a traditional organic system nor a simple inorganic system, but a composite system of graphene and inorganic antibacterial materials through complex physical and chemical processing such as dispersion, surface and complexation. It has high-efficiency, broad-spectrum antibacterial and antiviral characteristics.
Guona Technology Jiang believes that the advent of the graphene composite antibacterial and antiviral filter element means that the antiviral function of traditional HEPA filters is fully achievable and is of great significance.
The air purifier we need in the post-epidemic era
Based on the advent of the above-mentioned graphene composite antibacterial and antiviral filter element, Guona Technology Jiang believes that it can now answer the question "In the current epidemic, how to choose an air purifier and what kind of air purifier to choose?" .
To put it simply, needs to upgrade the traditional air purifier. Here, it only needs to equip the HEPA filter with anti-virus capabilities, that is, use a similar graphene composite antibacterial and antiviral filter element to replace the traditional filter , which only has the function of filtering particulate matter and removing odors. Only by using such air purifiers with anti-viral functions can we better cope with the normalization of the epidemic, reduce environmental risks, and protect us and those we care about, especially the elderly and children. What do you think of this? Please leave a message to discuss.
It is worth mentioning that the Guona Technology Sauce team once customized a solution for a well-known private school in Jiangsu, using two air purifiers in terms of brand, performance and price, namely MayAir 400S and MayAir 401 air purifiers, combined with the graphene composite antibacterial and antiviral filter element produced by Juzhi Suzhou Company, which can be combined and used in school classrooms and teachers' offices.Of course, this case can not only be used in schools, but also in KTVs, mahjong rooms, hotels, shopping malls, offices and homes, especially in relatively confined spaces. Through the air circulation of the purification equipment, the new crown aerosol in the air is intercepted on the filter and then killed, which is safer, more stable, and has no side effects caused by ozone, ultraviolet, etc.
Important statement: The articles published here are the original works of the author Guona Technology Sauce, and the copyright belongs to Guona Technology Sauce. Some pictures are from the Internet. Please indicate the original author and source when reprinting!
6. Operating system: Intelligent operating systems are the general trend. Air purifiers that only operate on the panel are outdated. Guona Technology Jiang believes that a good air purifier must be equipped with an easy-to-operate mobile APP. In this way, the purification equipment can be automatically turned on half an hour before we go home. Home is a clean and warm home, just waiting for the owner to return, but for traditional families.
Key points for selecting traditional air purifiers
After understanding the composition of traditional air purifiers, let’s take a look at the performance and price of air purifiers and other topics that everyone is most concerned about. Because regardless of the composition of the air purifier, in the end everyone still has to look at the core performance of the air purifier that must be paid attention to, and whether it is worth buying. Here is the analysis:
1, CARD value: The CADR value refers to the clean air output ratio of the air purifier, which is the volume of air purified in one hour. Obviously, the higher the CARD value, the greater the purification speed, the higher the purification efficiency, and the larger the purification space of the air purifier. According to "Air Purifier" (GB/T) 18801-2015), the room area that can be purified = CADR value × coefficient (0.07~0.12). Guona Technology Jiang believes that the bigger the better, the CARD value should match the size of the room. Don’t blindly pursue this value when choosing.
2, CCM value: CCM value refers to the total amount of pollutants purified by the air purifier, which is divided into four levels: P1, P2, P3, and P4. The higher the value, the higher the level, and the longer the service life of the filter. Guona Technology Jiang believes that the size of the CCM value is related to the service life of the core components of the air purifier, and is also related to our later use and maintenance costs. Everyone must pay attention to it.
3. Digital display of air quality: In addition to the purification, antibacterial and anti-viral capabilities of air purifiers, we must also pay attention to whether air quality is digitally displayed. This often leads to the public wondering, "After having an air purifier, has the air quality at home improved, and how much has it improved?" Guona Technology Jiang believes that if air purification equipment manufacturers cannot solve this problem well, it will lead to a lack of public trust and the future development of the industry will be restricted.
4. Price positioning: The price positioning of air purifiers is also a very important factor. Foreign brands generally take the high-end route; domestic brands generally take the cost-effective route, and a small number of them take the high-end route. Guona Technology Jiang believes that no matter which route it is, we can choose. As the saying goes, the one that suits you is the best, isn't it?
The shortcomings of traditional air purifiers
It is undeniable that traditional air purifiers provide the possibility to improve people's home and office environment. They can remove particulate matter in the air and also remove odors in the air, such as formaldehyde, TVOC, etc. However, is still slightly inferior to in the face of the new crown aerosols that normally exist in the air during the new crown epidemic. Why do you say this? This is analyzed from the particle removal mechanism of the traditional air purifier HEPA filter.
HEPA filter is a filter material made of fiber as the base material, or a composite fiber filter material interwoven with several fibers, or fiber is directly used as the filter material. Its main filtration mechanism includes: interception effect, inertia effect, diffusion effect, gravity effect, and electrostatic effect, which are explained here respectively. As follows:
- interception effect: When particles of a certain size move along streamlines near the fiber surface, if the distance from the center of the particle to the fiber surface is less than or equal to the radius of the particle, the particles will be intercepted and deposited on the fiber surface (the fibers are intricately arranged to form countless grids).
- Diffusion effect: Particles in the air with a particle size less than 1.0um will follow the air flow and undergo irregular Brownian motion; the smaller the particles, the more intense the Brownian motion. At normal temperature, the molecular diffusion distance of particles with a particle size of 0.1um can reach 17um per second, which is several times larger than the spacing between fibers. This gives the particles more opportunity to move to the fiber surface and attach to the fiber. The smaller the particles and the lower the filtration speed, the more significant the diffusion effect will be.Particles smaller than 0.1um mainly undergo Brownian motion, and the smaller they are, the easier they are to be removed; particles larger than 0.5um mainly undergo inertial motion, and the larger they are, the easier they are to be removed; therefore, particles between 0.1~0.5um have neither obvious diffusion nor inertial effects, making them more difficult to remove.
- Inertia effect: When particles pass through the intricately arranged fiber layer with the air flow (fluid), their streamlines will make multiple turns. When the particle particle is larger or faster, when the particle turns on the streamline, due to its inertia, the particle has no time to follow the streamline and bypass the fiber, so it breaks away from the streamline, approaches the fiber, and collides with the fiber to be deposited.
- Gravity effect: When moving particles pass through the filter fiber layer, they are displaced from their streamlines under the action of gravity and settle to the fiber surface. This gravity settling effect is only effective for larger particles with a particle size greater than 0.5um. Because small particles with a particle size less than 0.5um are less affected by gravity, they have already passed through the fiber layer with the air flow before settling on the fiber surface. Therefore, for particles with a particle size less than 0.5um, the gravity settling effect can be ignored.
- Electrostatic effect: When particles in the air pass through the fiber filter layer, due to friction and other reasons, both the fibers and the particles may be charged, creating an electrostatic effect that attracts the particles. However, in addition to intentionally charging the fibers and particles, if the fiber surface is charged due to friction and other effects during fiber processing, or the fiber surface is charged due to particle induction, the charge exists for a short time, and its electric field strength is also very small, and the gravitational force generated is very small and can be ignored.
It can be seen from the particle removal mechanism of the above HEPA filter that no matter what effect it is, it only intercepts and adsorbs the new coronavirus aerosol in the air. The hidden dangers have not been eliminated, and there is still a great risk of becoming a secondary pollution source. Therefore, we need to upgrade this traditional HEPA filter so that it can not only intercept aerosols containing the new coronavirus, but also inactivate the bacterial virus , thereby eliminating hidden dangers. If it can be realized, this will be a revolutionary change in traditional air purification filters. This is not an easy task and requires the support of materials scientists.
New Anti-Virus Materials
To realize the innovation of traditional HEPA filters, the participation of material scientists is required. In fact, Professor Huang Jiaxing of West Lake University is also working hard in the "
materials science industry. As early as February last year, good news came from Shanghai Juzhi New Material Technology Co., Ltd.: After several months of hard work, researchers developed a A new type of graphene-based composite anti-viral material has been successfully mass-produced, with a killing rate of 99% against the new coronavirus. For details, please refer to this article by Guona Technology Sauce - "
- "Capture": Graphene's special energy band structure and composite materials The semiconductor properties of the material , the inner cavity has a bipolar electric field effect, and it is easy to capture bacteria and viruses
- "kill": trigger ROS, produce high reactive oxygen species , other ions and free radicals adhere to the virus surface, destroy the structure and function of viral proteins and nucleic acids, the contact catalytic antibacterial and antiviral mechanism can quickly inactivate the captured bacteria and viruses
The graphene antiviral material project has a technically strong R&D team: it is based on the Solid State Ion and New Energy Materials Laboratory of the State Key Laboratory of Materials and Chemical Engineering of Nanjing University of Technology, led by Dr. Zhang Chunming, Shanghai Jiao Tong University Researcher Xiong Dingbang is the material consultant, and several doctors and masters in related fields are the backbone. This new graphene composite anti-viral material developed and mass-produced has passed the testing of ISO 18184-2019 and ISO 21702-2019 international standards. It can effectively resist a variety of viruses, bacteria and fungi, and establish a strong health protection shield. Related technologies have applied for more than 610 national invention patents.The products of this project and its downstream derivatives have been tested by third-party testing institutions such as Guangdong Microbial Analysis and Testing Center, Shanghai Microspectrum Chemical Industry, Beijing Gyeonggi Analysis and Testing Center, and Shanghai Huati Label Testing. The virus killing rate is:
- COVID -19：＞99%
- H3N2：＞99%
- H1N1：＞99.9%
After high temperature resistance, water washing resistance, nanometerization and broad-spectrum antibacterial tests, it shows that graphene antiviral materials have broad market application prospects:
- can withstand high temperatures: has passed 260℃ long-term processing and production tests
- can withstand water washing: has been washed 30 times and tested
- can be nanosized: has been made into a transparent AG anti-glare coating
- can be broad-spectrum antibacterial and antiviral: has been tested Through novel coronavirus, H1N1, H3N2, E. coli , Staphylococcus aureus , Pseudomonas aeruginosa , Candida albicans , fungi, etc.
The application development and layout of this material has been carried out in the fields of disinfection, protection, construction, textile, plastics, medical treatment, etc. It is expected that the application products that can be developed will be very wide, and the target market size will reach about 200 billion yuan. According to Dr. Zhang Chunming, the company's existing application product forms are mainly divided into graphene composite anti-viral powder, graphene composite anti-viral slurry and graphene composite anti-viral masterbatch:
1, graphene composite anti-viral powder
product form is powder, white, light gray or brown (different raw material ratios, used (different scenarios with color requirements), is the source of all subsequent applications, and can be used to prepare anti-viral fibers and fabrics such as melt-blown fabrics , non-woven fabrics, and printed fabrics, anti-viral coatings, anti-viral injection molded parts, anti-viral films, etc. Tested by a third-party testing agency, Shanghai Micropu Chemical Technology Service Co., Ltd., it has an anti-viral activity rate of >99% for the new coronavirus COVID-19.
2, graphene composite anti-virus slurry
- anti-virus white oil slurry for special fiber : in the field of safety protection, protective gloves and fabrics have been made in the field of special ultra-high molecular weight polyethylene fiber, and have been tested by third parties The Guangdong Microbiological Analysis and Testing Center tested the killing rate test and water-washing resistance test of H3N2, E. coli, Staphylococcus aureus and other bacteria and viruses, and achieved >99% killing data, and has passed the export certification
- water-based anti-viral slurry for post-finishing fabrics: In the field of apparel fabrics, 2.2-meter width 100 has been tested on a small scale The 0-meter-long printed fabric sample was tested by the third-party testing agency Huati Testing and Certification Group Co., Ltd. . It has good water resistance and antibacterial rate against Staphylococcus aureus (before and after 10 times of washing, the antibacterial effect has not been attenuated, >99%). It is expected to be applied to clothing fabrics
- special glass coating water-based and alcohol-based antiviral slurry: mainly used in mobile phones, computers, vehicle-mounted monitors, etc.
- medical devices coating water-based and alcohol-based antiviral slurry: In the field of medical devices, normal medical devices require routine sterilization and sterilization operations. This antiviral coating can maintain the sterility of the device surface and has a broad application space. Tested by a third-party testing agency, the Beijing Gyeonggi Analysis and Testing Center, the antiviral activity rate against the new coronavirus COVID-19 is >99%
3. Graphene composite antiviral masterbatch
- Personal and medical protection: In the field of medical protection, the antiviral, antibacterial and filtration efficiency tests of meltblown cloth and masks have been completed, and all have reached product listing standards.The melt-blown cloth developed has been tested by the third-party testing agency Huati Testing and the Beijing Gyeonggi Analysis and Testing Center. The antiviral activity rate against pathogens such as COVID-19, E. coli, and Staphylococcus aureus is >99%
- Air conditioning and fresh air system for closed and semi-enclosed spaces : In the field of building protection, the anti-virus filter element can be applied to various closed/semi-enclosed spaces
- Special plastic injection molding parts: In the field of precision optics, KL Optics has been used in special applications This graphene composite antiviral masterbatch is added to lenses and frames, and the antiviral activity rate against the new coronavirus COVID-19 is close to 99%.
- Cold chain packaging film: In the packaging field, we are working with downstream companies to verify that the antiviral factors in packaging products can kill or inhibit viruses at low temperatures. Production effect
It can be said that the advent of this graphene anti-virus material provides us with a good idea to solve the anti-virus problem of HEPA filters, but there is still one step left, that is, to integrate this material into the traditional HEPA filter. Can it be achieved?
anti-virus filter
Just when we were worried about whether the graphene anti-viral material developed by Juzhi could be smoothly integrated into the HEPA filter, after more than 5 months of hard work by scientific researchers, Juzhi (Suzhou) Nanotechnology Co., Ltd. located in Suzhou Industrial Park successfully developed a graphene composite antibacterial and antiviral filter element. This solution may have been the first in the world at the time. For details, see this article from Guona Technology Sauce - "
Guona Technology Sauce believes that the release of this solution will add new solutions and new options to improve the safety of public places, especially places with large flow of people and relatively closed places. It is a major event in the field of health and cleanliness:
- Compared with traditional ultraviolet antibacterial and antiviral solutions, the advantages of this graphene composite antibacterial and antiviral filter solution are very obvious: no need for electricity, more energy-saving, no ozone release, more environmentally friendly
- Compared with traditional filter elements, this solution incorporates antibacterial and antiviral functions, achieving the purpose of one core with multiple uses. Users only need to replace the filter element regularly to get a safer, cleaner and healthier living environment.
- Compared with filter elements with antibacterial functions on the market, this solution is not a simple coating or spraying, but is fully integrated into the filter element. It has obvious weather resistance advantages and does not have obvious problems such as unevenness and shedding. 5
- Importantly, the source of the material used in this filter element is neither a traditional organic system nor a simple inorganic system, but a composite system of graphene and inorganic antibacterial materials through complex physical and chemical processing such as dispersion, surface and complexation. It has high-efficiency, broad-spectrum antibacterial and antiviral characteristics.
Guona Technology Jiang believes that the advent of the graphene composite antibacterial and antiviral filter element means that the antiviral function of traditional HEPA filters is fully achievable and is of great significance.
The air purifier we need in the post-epidemic era
Based on the advent of the above-mentioned graphene composite antibacterial and antiviral filter element, Guona Technology Jiang believes that it can now answer the question "In the current epidemic, how to choose an air purifier and what kind of air purifier to choose?" .
To put it simply, needs to upgrade the traditional air purifier. Here, it only needs to equip the HEPA filter with anti-virus capabilities, that is, use a similar graphene composite antibacterial and antiviral filter element to replace the traditional filter , which only has the function of filtering particulate matter and removing odors. Only by using such air purifiers with anti-viral functions can we better cope with the normalization of the epidemic, reduce environmental risks, and protect us and those we care about, especially the elderly and children. What do you think of this? Please leave a message to discuss.
It is worth mentioning that the Guona Technology Sauce team once customized a solution for a well-known private school in Jiangsu, using two air purifiers in terms of brand, performance and price, namely MayAir 400S and MayAir 401 air purifiers, combined with the graphene composite antibacterial and antiviral filter element produced by Juzhi Suzhou Company, which can be combined and used in school classrooms and teachers' offices.Of course, this case can not only be used in schools, but also in KTVs, mahjong rooms, hotels, shopping malls, offices and homes, especially in relatively confined spaces. Through the air circulation of the purification equipment, the new crown aerosol in the air is intercepted on the filter and then killed, which is safer, more stable, and has no side effects caused by ozone, ultraviolet, etc.
Important statement: The articles published here are the original works of the author Guona Technology Sauce, and the copyright belongs to Guona Technology Sauce. Some pictures are from the Internet. Please indicate the original author and source when reprinting!
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