Five of the most commonly used materials in general-purpose engineering plastics are referred to as the five engineering plastics, including polyamide (PA), polyoxymethylene (POM), PPO (polyphenylene oxide), and polycarbonate (PC). Polybutylene terephthalate/polyethylene terephthalate (PBT/PET). Each material has different uses depending on the price and performance.

Polyamide (PA), also known as nylon, is the earliest and most developed engineering plastic. The reason why nylon is called is the product name when DuPont invented polyamide. According to the type of preparation of monomers and production methods, polyamide is divided into multiple varieties. Nylon 66 and nylon 6 are the most common and account 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 low water absorption and low rigidity. Nylon 1010 is translucent, low water absorption, good cold resistance, suitable for the production of general mechanical parts, wear-reducing wear-resistant parts, transmission parts, and chemical, electrical, instrumentation and other parts.

Polycarbonate (PC) not only has the strength similar to non-ferrous metals, but also possesses both ductility and toughness. Its impact strength is extremely high. It can't be damaged by percussion with a hammer, and it can withstand the explosion of a TV screen. Polycarbonates are excellent in transparency and can be colored. Due to the above-mentioned excellent properties of polycarbonate, it has been widely used in various safety lamp shades, signal lamps, transparent protective plates for stadiums, stadiums, lighting glass, high-rise building glass, automotive mirrors, windshield plates, aircraft cockpit glass, motorcycles Car driving safety helmet. The most used markets are computers, Office Equipment, automobiles, alternative glass and sheets, and CDs and DVDs are among the most promising markets.

Polyoxymethylene (POM) is a high-density, high-crystallinity thermoplastic engineering plastic. Has good physical, mechanical and chemical properties, especially excellent friction properties. It is precisely because these excellent chemical and physical properties can be comparable to steel, and lighter than steel, known as "Saigang." It has good overall performance, high strength and rigidity, good abrasion and wear resistance, small water absorption, good dimensional stability, but poor thermal stability, easy to burn, and easy to age in the atmosphere. Suitable for the production of wear-resisting parts, transmission parts, and chemical, instrumentation and other parts.

The density of polyphenylene oxide (PPO) is the lightest among the five general-purpose engineering plastics. It also has excellent electrical insulation and dimensional stability, water resistance, resistance to cooking, good mechanical strength, resistance to tensile and creep, and resistance to low temperatures. High impact strength, not easy to absorb water. However, the disadvantage is that it is not easy to process, the cost is high, and it is easily corroded by chemicals. Used to make camera parts, car dashboards, electrical enclosures, switches, hoods, and more.

Polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) are thermoplastic polyesters. PBT processing performance and electrical properties are good, the glass transition temperature is low, the mold temperature can be rapidly crystallized at 50 degrees, the processing cycle is short. PBT is widely used in the electronics, electrical and automotive industries. Because PBT's high insulation and temperature resistance can be used as TV's flyback transformers, automotive distribution board and ignition coils, office equipment housings and bases, various automotive exterior parts, air conditioner fans, electronic stove bases, and office Equipment shell.

In addition to the direct use of the five general-purpose engineering plastics, in order to improve its performance, a plastic modification technology has been created, and the improved performance of the modified engineering plastics has further expanded the scope of application of engineering plastics. The doping of glass fibers greatly increases the strength and toughness of the plastic. Other processing methods such as copolymerization modification also produced a variety of other new products with excellent performance.

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