Engineering Plastic Engineering plastics can be used as engineering materials and replace the metal manufacturing machinery parts and other plastic. Engineering plastics have excellent overall performance, rigidity, small creep, high mechanical strength, good heat resistance, good electrical insulation, can be used in the harsh chemical and physical environment for long-term use, alternative metal as the use of engineering materials , But the price is more expensive, the output is smaller.
Engineering Plastic Engineering plastics can be divided into general engineering plastics and special engineering plastics two categories. The main varieties of the former are polyamide, polycarbonate, POM, modified polyphenylene oxide and thermoplastic polyester five general engineering plastics; the latter mainly refers to the heat resistance of more than 150 ℃ engineering plastics, the main varieties are polyimide , Polyphenylene sulfide, polysulfone, aromatic polyamide, polyarylate, polyphenylene oxide, polyaryletherketone, liquid crystal polymer and fluororesin.
Engineering plastics performance characteristics are:
(1) Compared with the general plastic, with excellent heat and cold resistance, in a wide range of temperature mechanical properties, suitable for use as a structural material;
(2) good corrosion resistance, less affected by the environment, have a good durability;
(3) compared with the metal material, easy processing, high production efficiency, and can simplify the procedures, cost savings;
(4) have good dimensional stability and electrical insulation;
(5) light weight, high strength, and has a prominent anti-friction, wear resistance.
A brief history
Engineering Plastic Engineering plastics were developed rapidly in the 1950s. Nylon 66 resin has been developed and put into production as early as 1939, but it was mainly used in the manufacture of synthetic fibers, until the 50's age to break through the traditional use of pure fiber, after forming the manufacture of plastic. The rapid development of engineering plastics, in the late 50s after the successful development of POM and polycarbonate, their appearance is of particular significance. Because of the high crystallinity of polyoxymethylene, it gives excellent mechanical properties, so that the first time the plastic as a substitute for metal materials and ranks among the ranks of structural materials. Later, with the successful development of copolymerized formaldehyde and the popularity of screw injection molding machine, to further establish the engineering plastics in the field of material important position. The polycarbonate is a comprehensive performance of the transparent engineering plastics, widely used, is one of the fastest growing engineering plastics, in the field of engineering plastics, its production and consumption second only to polyamide and ranked second.
Engineering Plastic In 1961, DuPont developed a successful polyimide, opened the road leading to the development of special engineering plastics. The presence of polyimides has also contributed to the development of many heat-resistant engineering plastics, such as polysulfone, polyphenylene sulfide and polybenzimidazole, which have had a profound impact on the development of the plastics industry.
US General Motors in 1964 to its development of polyphenylene ether resin into the industrial production.
In 1980, the British ICI company successfully developed a melting point up to 336 ℃ special engineering plastic polyether ether ketone (PEEK). PEEK has excellent heat resistance, radiation resistance and chemical resistance, and can be injection molding, which has aroused widespread concern. PEEK as the matrix, through the glass fiber or carbon fiber reinforced composite materials, has been in the field of aviation and aerospace applications.