Regarding the current situation of halogen-free flame-retardant ABS and the difference with halogen-containing flame-retardant ABS
ABS is a terpolymer of acrylonitrile , butadiene and styrene . As one of the five major synthetic resins , it is currently the largest production and most widely used polymer. It organically integrates the various properties of PS, SAN and BS, and has excellent mechanical properties of toughness, hardness and rigidity. In order to meet the requirements of flame retardant performance in accordance with UL94 V-0 (1.6mm), while taking into account both mechanical properties and tinting properties, especially maintaining a certain toughness, so that the notch impact strength of the material is not greatly affected, there are many solutions in the field of halogen flame retardant.
Also in the field of halogen-free flame retardant, red phosphorus flame retardant is a halogen-free flame retardant solution with high flame retardant efficiency. It meets the two requirements of flame retardant performance and mechanical properties. However, the ABS flame retardant material made of it cannot meet the coloring performance requirements due to its dark color, and can only be used in black or dark occasions. The current situation is: ABS halogen-free flame retardant modification under the premise that the three basic conditions of flame retardant performance, mechanical performance and coloring performance must be met at the same time, has always been a recognized problem in the field of flame retardant modification all over the world. No very good mature solutions have been found at home and abroad. The main reasons for analysis are mainly as follows:
One of the reasons: As a terpolymer, ABS itself has a halogen-free flame retardant solution that is very difficult to implement. In fact, compared with ABS, other monomer polymers (such as nylon, PBTh, PP, PC, PET, etc.), because only one needs to solve the halogen-free flame retardant of a pure polymer, the halogen-free flame retardant of these materials is often relatively easy to achieve, and many countries have already had good solutions. ABS is very different. It needs to meet the halogen-free flame retardant of three materials: acrylonitrile, butadiene and styrene at the same time. These three component materials often require different flame retardant mechanisms. In view of this, although many countries have been exploring for many years, so far, they have not yet formed a halogen-free flame retardant solution with an addition amount of less than 30%.
Reason 2: Some halogen-free flame retardant solutions that have been successfully developed in the world mainly include: dehydration and cooling flame retardant system based on aluminum hydroxide or magnesium hydroxide , expansion flame retardant system based on polyamine amine, flame retardant system based on alkyl or aryl phosphate (or phosphonate) flame retardant plasticizer, etc. The addition amount of flame retardant systems such as
generally needs to be above 35%. If the filling amount is too large, or the plasticization effect is too large, it has a great impact on the performance of the material, especially the impact strength of the notch, and therefore cannot meet the above three basic conditions.
For example, according to technical personnel from a listed company in the domestic engineering plastics field, Germany's Clariant (currently the most well-known halogen-free flame retardant manufacturer) has successfully developed the ABS halogen-free flame retardant after 5 years. The current gap impact strength can only reach about 2.2KJ/M2, which is far from meeting the requirements of downstream users.
Source: Network
