Polycarbonate, the Chinese name is polycarbonate.
Polycarbonate is a thermoplastic resin containing -[O-R-O-CO]-links in the molecular backbone. According to the molecular structure Polycarbonate with different ester groups can be divided into aliphatic, alicyclic, and aliphatic-aromatic types. Among them, aromatic polycarbonate is of practical value, and bisphenol A-type polycarbonate is the most important. The molecular weight is usually 3- 100,000. PC is an amorphous, odorless, non-toxic, highly transparent colorless or slightly yellow thermoplastic engineering plastic with excellent physical and mechanical properties, especially excellent impact resistance, tensile strength, flexural strength, compression High strength; small creep, dimensional stability; good heat resistance and low temperature resistance, stable mechanical properties, dimensional stability, electrical properties and flame retardancy in a wide temperature range, can be used between 60~ Used for a long time at 120℃; has no obvious melting point and is in a molten state at 220-230℃; due to the high rigidity of the molecular chain, the resin melt viscosity is high; the water absorption rate is small, the shrinkage rate is small, the dimensional accuracy is high, the dimensional stability is good, and the film is breathable It has little resistance; it is a self-extinguishing material; it is stable to light, but not resistant to ultraviolet light, and has good weather resistance; it is resistant to oil, acid, strong alkali, oxidizing acids, amines, and ketones; it is soluble in chlorinated hydrocarbons and aromatic Solvents can easily cause hydrolysis and cracking in water for a long time. The disadvantages are that due to poor fatigue strength, stress cracking is easy to occur, solvent resistance is poor, and wear resistance is poor. PC can be injection molded, extruded, molded, blow molded, thermoformed, and printed. , bonding, coating and machining, the most important processing method is injection molding. It must be pre-dried before molding, and the moisture content should be less than 0.02%. Trace amounts of moisture processed at high temperatures will cause the product to have a white and turbid color, silver wire and Bubbles, PC has considerable forced high elastic deformation ability at room temperature. It has high impact toughness, so it can be processed by cold pressing, cold drawing, cold rolling and other cold forming processes. The molecular weight of PC for extrusion should be greater than 30,000, and a gradient should be used Compression type screw, length-to-diameter ratio 1:18~24, compression ratio 1:2.5, can be used for extrusion blow molding, injection-blow, injection-pull-blow methods to form high-quality, highly transparent bottles. There are many types of PC alloys, improved PC has defects such as high melt viscosity (processability) and easy stress cracking of products. PC forms alloys or mixtures with different polymers to improve material properties. Specifically, they include PC/ABS alloy, PC/ASA alloy, PC/PBT Alloy, PC/PET alloy, PC/PET/elastomer hybrid, PC/MBS hybrid, PC/PTFE alloy, PC/PA alloy, etc., which have the performance advantages of the two materials and reduce costs. , such as PC/ABS alloy, PC mainly contributes high heat resistance, good toughness and impact strength, high strength, and flame retardancy, while ABS can improve formability, apparent quality, and reduce density. The three major advantages of PC The application fields are glass assembly industry, automobile industry and electronic and electrical appliance industry, followed by industrial machinery parts, optical discs, packaging, computers and other office equipment, medical and health care, films, leisure and protective equipment, etc. PC can be used as door and window glass, PC laminates are widely used in protective windows in banks, embassies, detention centers and public places, and are used in aircraft canopies, lighting equipment, industrial safety baffles and bulletproof glass. PC boards can be used for various signs, such as gasoline pumps Dials, car dashboards, warehouses and open-air commercial signs, dot sliding indicators, PC resin is used in car camera systems, instrument panel systems and interior decoration systems, as headlight covers, reinforced car front and rear baffles, reflective mirror frames, Door frame covers, operating rod sheaths, baffles, and PC are used as junction boxes, sockets, plugs and sleeves, gaskets, TV conversion devices, connectors for communication cables under telephone line brackets, switch boxes, telephone switchboards, Switchboard components, relay shells, PC can be used as low-load parts, used in household appliance motors, vacuum cleaners, shampooers, coffee machines, toasters, handles of power tools, various gears, worm gears, bushings, guides, Shelves in refrigerators. PC is an ideal material for CD storage media. PC bottles (containers) are transparent, light in weight, good in impact resistance, and resistant to certain high temperatures and corrosive solution washing. They are recyclable bottles (containers). PC and PC The alloy can be used as computer frames, casings and auxiliary machines, and printer parts. Modified PC is resistant to high-energy radiation sterilization, cooking and baking sterilization, and can be used in blood collection specimen equipment, blood oxygenators, surgical instruments, kidney dialyzers, etc., PC It can be used as helmets and hard hats, protective masks, sunglasses and sports goggles. PC film is widely used in printing charts, medical packaging, membrane commutators, etc.