What are the common engineering plastics?

Engineering plastics generally refer to plastic materials that can be used as structural materials to withstand mechanical stress and can be used in a wide temperature range and harsh chemical and physical environments. Engineering plastics can be divided into general engineering plastics and special engineering plastics two categories. General engineering plastics usually refer to five kinds of plastics that have been industrialized on a large scale and have a wide range of applications, namely polyamide (nylon, PA), polycarbonate (PC), polyoxymethylene (POM), polyester (mainly PBT) and polyphenylene oxide (PPO).

PA, commonly known as nylon, has won people's attention due to its unique low specific gravity, high tensile strength, wear resistance, good self-lubrication, excellent impact toughness, and both rigidity and flexibility. In addition, it has simple processing, high efficiency, and light specific gravity (Only metal 17), can be processed into various products to replace metals, and is widely used in automobiles and transportation industries. Typical products include pump impellers, fan blades, valve seats, bushings, bearings, various instrument panels, automotive electrical instruments, hot and cold air control valves and other parts. About 3.6-4kg of PA products are consumed per car. PA has the largest proportion of consumption in the automotive industry, followed by electrical and electronic.

PC not only has the strength of similar non-ferrous metals, but also has ductility and toughness, its impact strength is extremely high, with a hammer can not be destroyed, can withstand the explosion of the TV screen. The transparency of the polycarbonate is excellent and can be applied to any coloring. Due to the above excellent performance of polycarbonate, it has been widely used in various safety lampshades, signal lights, transparent protective panels of stadiums and stadiums, lighting glass, high-rise building glass, automobile reflectors, windshield glass, aircraft cockpit glass, motorcycle driving helmets. The largest markets are computers, office equipment, automobiles, alternative glass and sheet materials.

Polyoxymethylene (POM) is an engineering plastic with excellent performance. It is called "steel grabbing" super steel "abroad. POM has similar metal hardness, strength and rigidity. It has good self-lubrication, good fatigue resistance and elasticity in a wide range of temperature and humidity. In addition, it has good chemical resistance. At a cost lower than many other engineering plastics, pom is replacing some markets traditionally occupied by metals, such as replacing zinc, brass, aluminum and steel to make many parts. Since its inception, pom has been widely used in electrical and electronic, machinery, instruments, daily light industry, automobile building materials, agriculture and other fields. In many new areas of application, such as medical technology, sports equipment, etc., POM also showed a good growth trend.

PBT is a kind of thermoplastic polymer. Compared with other thermoplastic engineering plastics, non reinforced PBT has better processing performance and electrical properties. PBT glass transition temperature is low, the mold temperature at 5C can be rapidly crystallized, the processing cycle is short. Polybutylene terephthalate (PBT) is widely used in the electronics, electrical and automotive industries. Due to the high insulation and temperature resistance of PBT, it can be used as the flyback transformer of TV, automobile distributor and ignition coil, office equipment shell and base, various automobile exterior parts, air conditioner fan, electronic stove base and office equipment shell.

PPO. By 2,6-two substituted phenol by oxidative coupling polymerization of thermoplastic resin, generally a good comprehensive performance of ten yellow powder. Commonly used is the synthesis of 2,6-dimethyl phenol polyphenyl ether, with excellent characteristics of the biggest is in the long-term load, with excellent dimensional stability and outstanding electrical insulation, the use of a wide range of temperature polyphenyl ether can be.

It has excellent water resistance and steam resistance, high tensile strength and impact strength, and good creep resistance. In addition, it has better wear resistance and electrical properties. Mainly used to replace stainless steel in the manufacture of surgical medical instruments. In the mechanical and electrical industry, gears, blower blades, pipes, valves, screws and other fasteners and connectors can be made. It is also used to make parts in the electronic and electrical industries, such as coil frames and printed circuit boards.