Detailed explanation of material properties of the

Detailed description of material properties of engineering plastics industry research

five kinds of materials are the most widely used in general engineering plastics, which are called the five major engineering plastics, including polyamide (PA), Polyoxymethylene (POM), PPO (polyphenylene oxide), polycarbonate (PC) and polybutylene terephthalate/ethylene glycol (pbt/pet). Each material has different uses according to different prices and properties

polyamide (PA), also known as nylon, is an engineering plastic with the earliest development and the largest number of harmful materials contained in auto parts and interior decoration materials. The reason why it is called nylon is the trade name when DuPont invented polyamide. Polyamide can be divided into many varieties according to the types of monomers and production methods. Nylon 66 and nylon 6 are the most common, accounting for more than 90% of all polyamides used., Nylon 6 has good elasticity, high impact strength and large water absorption. Nylon 66 has better performance than nylon 6, high strength and good wear resistance. Nylon 610 is similar to nylon 66, but it has small water absorption and low stiffness. Nylon 1010 is translucent, with small water absorption and good cold resistance. It is suitable for making general mechanical parts, wear-resistant parts, transmission parts, as well as chemical, electrical, instrument and other parts

polycarbonate (PC) not only has the strength similar to non-ferrous metals, but also has ductility and strong toughness. Its impact strength is extremely high. It can not be damaged by hammering with 1 scratch resistance, and can withstand the explosion of TV fluorescent screen. Polycarbonate has excellent transparency and can be colored in any way. Due to the above excellent properties of polycarbonate, it has been widely used in various safety lampshades, signal lights, transparent protective plates of gymnasiums and stadiums, lighting glasses, high-rise building glasses, automobile reflectors, windshield plates, aircraft cockpit glass, motorcycle helmets. The most used markets are computers, office equipment, automobiles, alternative glass and sheets, and CD and DVD discs are one of the most potential markets

Polyoxymethylene (POM) is a thermoplastic engineering plastic with high density and high crystallinity. (3) Regularly check the accuracy of the hardness tester with a standard hardness block, and never allow the test on the support surface; It has good physical, mechanical and chemical properties, especially excellent friction resistance. It is precisely because these excellent chemical and physical properties can be comparable to steel, and the weight is lighter than steel. It is called (3) the pen and paper with automatic plotter are saigang. It has good comprehensive performance, high strength and stiffness, good abrasion resistance, small water absorption, good dimensional stability, but poor thermal stability, easy to burn, and easy to aging in the atmosphere. It is suitable for making wear-resistant parts, transmission parts, chemical and instrument parts

the density of polyphenylene oxide (PPO) is the lightest of the five widely used engineering plastics. At the same time, it has excellent electrical insulation and dimensional stability, water resistance, cooking resistance, good mechanical strength, tensile strength, creep resistance, high impact strength at low temperature, and is not easy to absorb water. However, the disadvantages are not easy to process, high cost and easy to be corroded by chemicals. It is used to make camera parts, car dashboard, electrical housing, switches, engine covers and so on

both polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) are thermoplastic polyesters. PBT has good processing and electrical properties, low glass transition temperature, rapid crystallization when the mold temperature is 50 ℃, and short processing cycle. PBT is widely used in electronic, electrical and automotive industries. Due to its high insulation and temperature resistance, PBT can be used as flyback transformer of TV, automobile distributor and ignition coil, shell and base of office equipment, various external components of automobile, fan of air conditioner, base of electronic stove and shell of office equipment

in addition to directly using the five general-purpose engineering plastics, in order to improve its performance, plastic modification technology has been produced. The performance of modified engineering plastics has been improved and the application scope of engineering plastics has been further expanded. The doping of glass fiber greatly improves the strength and toughness of plastics. Other treatment methods such as copolymerization modification have also produced a variety of other new products with excellent properties