The types of engineering plastics commonly used in China are polycarbonate, polyformaldehyde, polyamide, thermoplastic polyester and modified polyphenylene ether.
1. Polyamide:
(PA, common name: nylon) has won people’s attention because of its unique low specific gravity, high tensile strength, wear resistance, good self-lubrication, excellent impact toughness, and the performance of both rigidity and flexibility. In addition, its processing is simple, efficient, light weight (only 1/7 of metal), can be processed into various products to replace metal, and is widely used in automobile and transportation industry. Typical products include pump impellers, fan blades, valve seats, bushings, bearings, various instrument panels, automotive electrical instruments, cold and hot air control valves and other parts. Each vehicle consumes 3.6~4 kg of nylon products. Polyamide is the largest consumer in the automotive industry, followed by electronic and electrical products.
2. Polycarbonate:
(PC) has strength similar to nonferrous metal, ductility and toughness at the same time. Its impact strength is extremely high. It can not be damaged when struck with a hammer, and can withstand the explosion of TV screen. The transparency of polycarbonate is excellent, and it can be applied with any color. Due to the above excellent properties, polycarbonate has been widely used in various safety lampshades, signal lights, transparent protective panels of stadiums and stadiums, daylighting glass, glass of high-rise buildings, car reflectors, windshield panels, aircraft cockpit glass, motorcycle driving helmets. The markets with the largest consumption are computers, office equipment, automobiles, alternative glass and sheet materials. CD and DVD discs are one of the most promising markets.
3. Polyformaldehyde:
Polyoxymethylene (POM) is a kind of engineering plastics with excellent performance, which is known as “steel grabbing” and “super steel” abroad. Pom has the hardness, strength and rigidity similar to metals. 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 lower cost than many other engineering plastics, pom is replacing some markets traditionally occupied by metals, such as zinc, brass, aluminum and steel to make many parts. Since its inception, pom has been widely used in electronic and electrical, machinery, instrumentation, daily light industry, automobile, building materials, agriculture and other fields. In many new fields, such as medical technology and sports equipment, pom also shows a good growth trend.
4. PBT:
(PBT) is a thermoplastic polyester. Compared with other thermoplastic engineering plastics, non-reinforced PBT has better processing and electrical properties. The glass transition temperature of PBT is low, the mold temperature can be rapidly crystallized at 50 ℃, and the processing cycle is short. Polybutylene terephthalate (PBT) is widely used in the electronic, electrical and automotive industries. Due to the high insulation and temperature resistance of PBT, it can be used as the flyback transformer of TV, auto switchboard and ignition coil, office equipment shell and base, various external parts of car, air conditioner fan, electronic stove base, and office equipment shell.
5. Polyphenylene ether:
The chemical formula is abbreviated as PPO. Thermoplastic resin formed by oxidative coupling polymerization of 2,6-disubstituted phenol is generally in the form of earthy yellow powder. Commonly used is polyphenylene ether synthesized from 2,6-dimethylphenol, which has excellent comprehensive performance. The biggest feature is that under long-term load, it has excellent dimensional stability and outstanding electrical insulation. The use temperature range is wide, and the polyphenylene ether can be used in the range of – 127~121 ℃ for a long time. It has excellent water and steam resistance, high tensile strength and impact strength, and good creep resistance. In addition, it has good wear resistance and electrical properties. It is mainly used to replace stainless steel in manufacturing surgical medical instruments. In the electromechanical industry, it can be used to make gears, blower blades, pipes, valves, screws and other fasteners and connectors. It can also be used to make components in the electronic and electrical industries, such as coil framework and printed circuit boards.
Post time: Feb-03-2023