Engineering plastics can be used as engineering materials and plastics that replace metal parts for machine parts. Engineering plastics have excellent comprehensive performance, high rigidity, small creep, high mechanical strength, good heat resistance, good electrical insulation, long-term use in harsh chemical and physical environments, and can be used as an alternative structural material for metal. But the price is more expensive and the output is smaller. Engineering plastics have excellent heat and cold resistance, excellent mechanical properties over a wide temperature range, and are suitable for use as structural materials. Compared with general-purpose plastics, engineering plastics can achieve higher requirements in terms of mechanical properties, durability, corrosion resistance, heat resistance, etc., and are more convenient to process and can replace metal materials. Engineering plastics are widely used in electrical and electronic, automotive, construction, machinery, aerospace and other industries. It has become an international trend to replace steel and plastic. Engineering plastics has become the fastest growing field in the plastics industry in the world. Its development not only supports the national pillar industries and modern high-tech industries, but also promotes the transformation of traditional industries and product structure.
High-performance engineering plastics refer to a class of engineering plastics with a long-term use temperature above 150 °C. Despite its very high performance, the formability is not very good, and the price is high and the application is limited. According to market demand, it can be roughly divided into the following three categories.
1: Polyphenylene sulfide (PPS), fluororesin.
2: Polyarylate (PAR) and polymer liquid crystal (LCP).
3: polysulfone (PSU), polyethersulfone (PES), polyetheretherketone (PEEK), polyetherimide (PE1), polyimide (P1), polyamideimide (PAl), and the like.
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