Minnan.com June 1 (Minnan.com reporter Stefanie You) In order to implement the dual-wheel drive strategy of "strengthening industries and developing cities", the "New Materials Science and Technology Achievements Special Promotion Conference" guided by the Quanzhou Municipal Science and Technology Bureau and hosted by the Quanzhou Productivity Promotion Center, the Fujian Institute of Material Structure of the Chinese Academy of Sciences and Quanzhou Normal University was held in Jinjiang on May 31. More than 40 shoe companies from the province and the city participated in the promotion meeting. Wu Lixin, a researcher at the Fujian Institute of Material Structure, Chinese Academy of Sciences and director of the Fujian Provincial Functional Resin and Composite Materials Engineering Research Center, demonstrated the technical achievements.
New Material Technology Promotion Conference
Participants are consulting Dr. Wu Lixin (left) related information
Wu Lixin introduced that in November 2020, the Fujian Institute of Material Structure of the Chinese Academy of Sciences and Jiayi Plastics signed an industry-university cooperation agreement, jointly committed to the development of EVA's supercritical first-forming technology; in May 2022, the project was recommended by the Quanzhou Science and Technology Bureau to apply for the STS project of the Fujian Academy of Sciences.
This technology uses supercritical nitrogen foaming forming technology to solve the technical problems of high heat shrinkability and large size difference after forming, and the need for secondary molding. Compared with the existing supercritical secondary forming technology, it has the advantages of low equipment demand, short forming cycle and significantly reduced costs. The shoes produced are lightweight, elastic, anti-slip and wear-resistant. The new generation of supercritical forming technology does not contain chemical foaming agents. It is not only environmentally friendly, but also has bright colors and clear surface patterns. It is expected to replace traditional shoemaking technology in large quantities and help shoe companies across the city expand their high-end market.
Wu Lixin introduced that the advantages of this technology are: First of all, through material synthesis and formula design, the molding size of EVA shoes can be flexibly adjusted within the 4-digit range, and the foaming behavior of the shoes can be effectively adjusted to solve the major heat shrinkage problem in supercritical primary molding. Secondly, the new technology can reduce the pressure requirements for the injection machine, and can reduce the maintenance cycle of the mold and extend the service life.
in terms of promotion and application: First, in terms of raw material cost, although the price of supercritical primary forming EVA special material is more expensive than ordinary materials, the shoe material produced is small in proportion and can achieve 100% full recycling of scraps and defective materials generated during the forming process, so there will be no significant improvement.
Second, in terms of equipment purchase and depreciation, since the purchase cost of autoclaves with large batch production is very high, for the initial promotion stage of the enterprise, you can find manufacturers of existing autoclaves to produce OEM. The production cost per pair is 5 to 10 yuan. After the scale is formed, the autoclave will be added for production.
