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PC has many excellent properties and its application area is constantly expanding. However, due to its high melt viscosity, it is difficult to process and cracks easily, and its solvent resistance and abrasion resistance are poor, which limits the application of PC in many fields. Therefore, research on PC modification becomes the most important for its application research. Subject. At present, polymer alloying has become an important approach for PC modification. PC alloys have great potential for development and application in many areas of the domestic market.
——Optics and building materials As a kind of engineering plastics with good transparency, PC disc substrates are widely used worldwide. In particular, the copolymers produced by the grafting of PC and styrene have a compatibilizing effect. Such materials are more suitable for production. CD. Adding PS to the PC can reduce the activation energy of the viscous flow of the PC, thereby improving the processing fluidity of the PC. The PS can also act as a rigid organic filler in the PC. Both the PC and the PS are transparent materials, and the refractive indexes of the two are very close. Therefore, the PC/PS alloy is transparent and has good optical properties, and is particularly suitable for making spectacle lenses. In addition, the PC/PS alloy has good light transmittance and good stiffness, which makes it very popular and has potential applications in window materials, high-rise building curtain walls, airports and stadiums and transparent building materials.
——The electrical field is widely used in the field of telecommunication equipment due to its good electrical insulation performance. At present, PCs have largely replaced the original phenolic plastics. The development trend of lightweight and miniaturized communication electronics places higher demands on PC materials, and PC/ABS alloys are particularly suited to this trend. PC and ABS blends can combine the excellent properties of PC and ABS. On the one hand, they can improve the heat resistance, impact resistance and tensile strength of ABS. On the other hand, they can reduce PC cost and melt viscosity, improve processing performance, and reduce products. The sensitivity of internal stress and impact strength to the thickness of the product. At present, PC/ABS alloys are developing rapidly. The global production is about 800,000 tons/year. China's Shanghai Jieshijie, Lanzhou University and the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences have conducted a lot of research on this, and some products have been introduced to the market.
——The auto parts PC surface has good metallic luster and high strength after being metallized. It is widely used in various auto parts, but its impact toughness will be reduced during the electroplating process. Therefore, the electroplating grade PC resin has very promising development. Blended with the elastomer and the PC, the elastomer contained dispersed cracking stress, and the impact toughness was not reduced by electroplating. But now more is the use of PC / PBT alloy and thermoplastic elastomers such as ethylene / methyl methacrylate and other copolymer blends to increase its impact strength. PBT has excellent mechanical properties, chemical resistance, and easy molding. The blending of PBT and PC to obtain an alloy material can improve the flowability of PC and improve the processing performance and chemical resistance. At present, PC/PBT alloy products are mainly used for car bumpers, car seats and seats, and also for high-grade Packaging Film materials.
——The medical device raw material PC has many excellent properties and has been used in medical devices at present, but its chemical resistance is poor, and internal stress cracking is easily caused in the presence of chemicals. PET has good mechanical properties and chemical resistance. PC/PET alloys have both rigidity and heat resistance of PC, and solvent resistance of PET, and the addition of PET can also improve the processing fluidity of PC. In a PC/PET blend system, the addition of an elastomer such as polybutyl acrylate can also increase the toughness and impact strength of the alloy. In addition, PC in the application of medical devices also need to solve the aging phenomenon caused by high temperature sterilization cracks, which is the future research direction.
The research and development of PC alloys are changing with each passing day, and various PC alloys have been continuously developed and introduced to the market, such as PO/PC, PC/PCL, and various polyester and PC blend modification studies, aiming at improving the impact of PCs. Properties, processing properties, yellowing resistance, transparency, etc. to suit different applications. As an important synthetic resin, PC will maintain a high growth rate in domestic demand in the future. Experts expect that the total PC consumption in China will reach about 450,000 tons in 2005. Therefore, domestic research should continue to increase PC modification and develop performance. More excellent, more widely used PC and alloy products, focusing on the development of high-performance optical disc products, transparent glass alloy products replacing glass, flame retardant PC products required in the field of electronic appliances, good dimensional stability and resistance to cracking , PC-reinforced materials that can replace metals, non-toxic sanitary food packaging PC materials, etc., to meet the needs of PC in many domestic industrial fields.
Polycarbonate alloying research
Polycarbonate (PC) resin is the only product with good transparency among the five major engineering plastics, and it is also the fastest growing general engineering plastic in recent years. With the rapid development of industries such as automobiles, electrical and electronic equipment, building materials, and food packaging in China, the demand for PCs has increased rapidly. Over the past 10 years, it has maintained an average annual growth rate of over 30%. In 2002, domestic consumption was about 340,000 tons. There is almost no domestic production, and all of them need to be imported.