Engineering Plastics
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Engineering Plastics

Engineering plastics can be used as engineering materials and plastics that replace metal manufacturing machine parts. Engineering plastics have excellent comprehensive properties, high rigidity, low creep, high mechanical strength, good heat resistance, and good electrical insulation. Engineering plastics can be used for a long time in harsher chemical and physical environments and can replace metals as engineering structural materials, but they are more expensive and less productive.

The Main Characteristics of Engineering Plastics Are:

● Compared with general-purpose plastics, it has excellent heat and cold resistance. Excellent mechanical properties in a wide temperature range, suitable for use as a structural material.
● Good corrosion resistance, less environmental impact, and good durability.
● Compared with metal materials, it is easy to process, has high production efficiency, and can simplify procedures and save costs.
● It has good dimensional stability and electrical insulation.
● Lightweight, high specific strength, and outstanding friction reduction and wear resistance.

Classification of Engineering Plastics

Engineering plastics can be divided into general engineering plastics and special engineering plastics.
The main varieties of the former include five general engineering plastics: polyamide, polycarbonate, polyoxymethylene, modified polyphenylene ether, and thermoplastic polyester.
The latter mainly refers to engineering plastics with heat resistance above 150°C. The main varieties are polyimide, polyphenylene sulfide, polysulfone, aromatic polyamide, polyarylate, polyphenyl ester, polyaryletherketone, liquid crystal polymer, and fluororesin, etc.

Different Engineering Plastics Application

Engineering plastics mainly include polycarbonate (PC), polyamide (PA), polyacetal (Polyoxy Methylene, POM), polyphenylene oxide (PPO), polyester (PET, PBT), Polyphenylene Sulfide (PPS), polyarylester, etc.

Polyamide( PA)

Polyamide (PA, common name: nylon) has won people's attention because of its unique low specific gravity, high tensile strength, abrasion resistance, good self-lubricity, excellent impact toughness, and both rigid and flexible properties. In addition to its simple processing and light specific gravity (only 1/7 of metal), it can be processed into various products to replace metal and is widely used in automobiles and transportation.

Typical products include pump impellers, fan blades, valve seats, bushings, bearings, various instrument panels, automotive electrical instruments, and hot and cold air control valves. Approximately, each car consumes 3.6 to 4 kilograms of nylon products. Polyamide extrusion has the largest proportion of consumption in the automotive industry, followed by electronics and electrical.

The purpose of polyamide modification is different. Polyamide modification can be divided into types such as reinforcement, toughening, flame retardant, filling, and alloy.

In order to obtain a polyamide material with higher strength and heat distortion temperature, inorganic or organic fibers or fillers are added to the polyamide matrix, and a high-strength polyamide composite material is prepared by a blending extrusion method.

Commonly used polyamide reinforcement materials include glass fiber, carbon fiber, and aramid fiber. Inorganic whiskers are also used for polyamide reinforcement.

Polycarbonate (PC)

Polycarbonate not only has strength similar to non-ferrous metals but also has ductility and toughness. Its impact strength is extremely high, it will not be damaged by hammering it, and it can withstand the explosion of the TV screen. Polycarbonate has excellent transparency and can be applied with any coloring.

Due to the above-mentioned excellent properties of polycarbonate, PC extruder has been widely used in various safety lampshades, signal lights, transparent protective panels for stadiums and stadiums, daylighting glass, high-rise building glass, automobile mirrors, windshield panels, aircraft cockpit glass, motorcycle driving helmet.

Polybutylene terephthalate (PBT)

Polybutylene terephthalate is a thermoplastic polyester. Compared with other thermoplastic engineering plastics, unreinforced PBT has better processing and electrical properties. PBT has a low glass transition temperature, and it can quickly crystallize when the mold temperature is 50°C, and the processing cycle is short.

Polybutylene terephthalate (PBT) is widely used in the electronics, electrical and automotive industries. Due to its high insulation and temperature resistance, PBT extrusion can be used as a flyback transformer for TV sets, automotive distributors and ignition coils, office equipment housings and bases, various automotive exterior parts, air conditioners, fans, and electronic stove bases.

Polyphenylene sulfide (PPS)

The advantages of PPS are:
● Good heat resistance, 180~220℃ temperature range.
● The corrosion resistance is close to that of PTFE.
● Excellent electrical performance.
● Excellent mechanical properties.
● Good flame retardancy.

 

The disadvantages of PPS are:
● The price is too high, which is a low price among high-temperature resistant plastics, but much higher than general engineering plastics.
PPS extrusion prodexts has poor toughness and brittleness characteristics.
● The viscosity is unstable during processing.

Polyoxymethylene (POM)

POM has the hardness, strength, and rigidity similar to metals, and good chemical resistance. At a lower cost 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 extrusion has been widely used in electrical and electronic, machinery, instrumentation, daily light industry, automobiles, building materials, agriculture, and other fields. In many new areas of applications, such as medical technology, sports equipment, etc., POM has also shown a good growth trend.

Polyphenylene ether (PPO)

Polyphenylene ether has excellent comprehensive properties. The biggest feature is that it has excellent dimensional stability and outstanding electrical insulation under long-term load, and has a wide operating temperature range, which can be used for a long time in the range of -127~121℃. Has excellent water resistance and steam resistance. The product has high tensile strength and impact strength, and good creep resistance. In addition, it has better wear resistance and electrical properties.

PPO extrusion is mainly used to replace stainless steel to manufacture surgical medical instruments. In the electromechanical industry, gears, blower blades, pipes, valves, screws, and other fasteners and connectors can be made. It is also used to make parts in the electronics and electrical industries, such as coil bobbins and printed circuit boards.

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