In the mechanical parts processing industry, plastics are often used as raw materials for further processing. Now there are many types of plastics on the market. So what kind of plastic should be selected when processing mechanical parts?
1. ABS plastic
ABS resin is one of the five major synthetic resins. It has excellent impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical properties. It also has the characteristics of easy processing, stable product dimensions, good surface gloss, etc. What's more, it is easy to paint and color. It can also be used for secondary processing such as surface metal spraying, electroplating, welding, hot pressing and bonding. This wide range of engineering thermoplastics is widely used in machinery, automobiles, electronic appliances, instrumentation, textiles and construction and other industrial fields. ABS is usually a pale yellow or milky white granular amorphous resin, which is one of the most widely used engineering plastics.
The material has the most superior comprehensive properties, including mechanical strength, stiffness, toughness, mechanical shock absorption and wear resistance. These characteristics, coupled with good electrical insulation and chemical resistance, make nylon 6 a "universal grade" material for the manufacture of mechanical structural parts and maintainable parts.
Polyvinyl chloride, abbreviated as PVC in English, is a vinyl chloride monomer (VCM) in peroxide, azo compound and other initiators; or with the effect of light and heat formed by polymerization according to the free radical polymerization reaction mechanism polymers. Vinyl chloride homopolymer and vinyl chloride copolymer are collectively referred to as vinyl chloride resin. PVC used to be the world's largest production of general-purpose plastics, and is widely used in building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, fibers, etc.
Polycarbonate (PC for short) is a high molecular weight polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it can be divided into aliphatic, aromatic, aliphatic-aromatic and other types. Among them, the lower mechanical properties of aliphatic and aliphatic-aromatic polycarbonates limit their application in engineering plastics. The three major application fields of PC engineering plastics are glass assembly industry, automobile industry and electronics and electrical industry, followed by industrial machinery parts, optical discs, packaging, computers and other office equipment, medical and health care, films, leisure and protective equipment, etc.
Polypropylene is a kind of thermoplastic resin made by polymerization of propylene. The relative density is small, only 0.89-0.91, which is one of the lightest varieties in plastics. Due to the high crystallinity, the surface rigidity and scratch resistance of this material are very good. PP does not have the problem of environmental stress cracking.