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Development of Enginnering Plastics

Engineering plastics developed rapidly since the 1950s. Although PA66 resin was successfully developed and put into production as early as 1939, it was mainly used for the manufacture of synthetic fibers. Until the 1950s, it broke through the traditional usage and is used through molding process for plastics prodcts. The real rapid development of engineering plastics is after the successful development of polyoxymethylene and polycarbonate in the late 1950s.
 
Due to its high crystallinity, polyoxymethylene is endowed with excellent mechanical properties, and for the first time, plastics are placed in the ranks of structural materials as materials that can replace metals. Later, with the successful development of copolymerization formaldehyde and the popularity of screw injection molding machines, the importance of engineering plastics in the field of materials has been further established. Polycarbonate is a transparent engineering plastic with excellent comprehensive performance and is widely used. It is one of the fastest-growing engineering plastics. In the field of engineering plastics, its output and consumption are second only to polyamide.
 
In 1961, the United States DuPont company successfully developed polyimide, opened the door to the development of special engineering plastics. The appearance of polyimide has also promoted the development of many heat-resistant engineering plastics such as polysulfone, polyphenylene sulfide and polybenzimidazole, and has had a profound impact on the development of the plastics industry.
 
In 1964, U.S. General Corporation invested its polyphenylene ether resin in industrial production.
 
In 1980, the British ICI company developed a special engineering plastic polyetheretherketone (PEEK) with a melting point of up to 336°C. PEEK has excellent heat resistance, radiation resistance and chemical resistance, and can be injection molded, which has caused widespread concern. The composite material made of glass fiber or carbon fiber with PEEK as the matrix has been applied in aviation and aerospace fields.
 
The successful development of thermotropic liquid crystal polymers in the mid-1980s was another major event in the history of special engineering plastics. The liquid crystal polymer has excellent heat resistance, and the use temperature can reach above 200°C. It has the characteristics of self-reinforcement, high strength, high modulus, chemical resistance, low melt viscosity, convenient molding, and has a very wide application in the field of electronic industry. prospect.
 
Compared with general plastics, engineering plastics can meet higher requirements in terms of mechanical properties, durability, corrosion resistance, heat resistance, etc., and processing is more convenient and can replace metal materials. Engineering plastics are widely used in electrical and electronic, automotive, construction, office equipment, machinery, aerospace and other industries. Plastic substitution of steel and plastic substitute wood has become an international trend. Engineering plastics has become the fastest growing field in the world's plastics industry. Its development not only supports the national pillar industry and the modern high-tech industry, but also promotes the transformation of traditional industries and the adjustment of product structure.
 
The application of engineering plastics in automobiles is increasing, mainly used as bumpers, fuel tanks, dashboards, body panels, doors, lamp covers, fuel pipes, radiators, and engine-related parts.
 
The Julong Automobile Division was established in 2004. In 2008, Ni-ssans confirmation of Chinas autos officially entered the automotive materials market. Automotive materials include: modified PP, PA6, PA66, heat-resistant ABS, PA/ABS, PC/ABS, ASA, PC/PBT, PET/PBT, PPS, and others.
 
Mechanically, engineering plastics can be used for mechanical parts such as bearings, gears, screw nuts, and seals, and mechanical structural parts such as housings, covers, hand wheels, handles, fasteners, and fittings.
 
In electronic and electrical engineering, engineering plastics can be used in wire and cable coatings, printed circuit boards, insulating films and other insulating materials and electrical equipment structural parts.
 
In household appliances, engineering plastics can be used in refrigerators, washing machines, air conditioners, televisions, fans, vacuum cleaners, electric irons, microwave ovens, rice cookers, radios, combination audio equipment, and lighting fixtures.
 
In the chemical industry, engineering plastics can be used in chemical equipment such as heat exchangers, chemical equipment linings, and pipe and fittings, valves, pumps and other chemical pipelines.
 
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