According to the "Management Measures for Group Standards of Wenzhou Plastic Industry Association", after evaluation by the Wenzhou Plastic Products Standardization Technical Committee, the "Recycled Polycarbonate (PC) Special Material for Plastic Home Appliance Shells" standard released by the World Expo New Materials meets the project approval conditions. The above standards are included in the first batch of Wenzhou Plastic Industry Association group standard approval plan in 2021.
Polycarbonate is a strong and tough thermoplastic resin, named after its internal groups. It can be synthesized from bisphenol A and carbon oxychloride (COCl2). The commonly used method is the melt ester exchange method (synthesis of bisphenol A and diphenyl carbonate through ester exchange and condensation reactions). Reaction principle of bisphenol A and diphenyl carbonate:
Polycarbonate is colorless and transparent, heat-resistant, impact resistant, flame retardant BI grade, and has good mechanical properties within normal usage temperatures. Compared to polymethyl methacrylate, polycarbonate has good impact resistance, high refractive index, good processability, and UL94 V-2 flame retardancy without the need for additives. Due to its excellent and constant electrical insulation properties over a wide range of temperature and humidity, polycarbonate is an excellent insulation material. At the same time, its good flame retardancy and dimensional stability have formed a broad application field in the electronic and electrical industry.
Polycarbonate resin is mainly used in the production of various food processing machinery, electric tool casings, bodies, brackets, refrigerator freezer drawers, and vacuum cleaner parts. And for important components in computers, video recorders, and color televisions that require high precision, polycarbonate materials have also shown high practical value.
Over the years, Expo new materials have actively played a role in the development of the new materials industry, fully utilizing their rich theoretical and practical experience accumulated in long-term research on new materials. They have successively edited and participated in the compilation of a series of national and local standards, making due contributions to the standardized construction and high-quality development of the entire new materials industry, demonstrating the responsibility and strength of Expo new materials.
