1、 According to the heat change of resin
1. Thermoplastic
It refers to a kind of plastic that can be re softened and processed by reheating after forming, but the chemical composition is unchanged. The resin is of linear structure before and after processing
It has the characteristics of melting and dissolving without chemical change. There are many such resins, such as polyethylene, polypropylene, polyvinyl chloride, polyphenylene glycol
Alkene, polyamide, polycarbonate, POM, polyester, polyphenylene ether, polymethyl methacrylate, polyurethane, fluoroplastics, polyphenylene sulfide
Ether, polysulfone, polyimide, etc.
2. Thermosetting plastics
It refers to a kind of plastic that can not be heated and softened after forming and can be processed repeatedly. The resin is linear prepolymer before processing, and chemical crosslinking occurs during processing
The reaction makes the inner part of the product become three-dimensional network structure, which is insoluble and immiscible. Such as phenolic resin, amino resin, epoxy resin and unsatisfied
And resin, etc.
2、 According to the structure of resin
This classification method is based on the characteristics of resin macromolecular chain, which can be generally divided into the following categories.
1. Polyolefin
It refers to a kind of resins and copolymers with hydrocarbon structure on the main and side chains of macromolecules, including polyethylene, polypropylene, styrene and styrene / butadiene
Diene / acrylonitrile copolymer, butadiene, polymethyl-1-pentene, ethylene / vinyl alcohol copolymer, ethylene / vinyl acetate copolymer, etc.
2. Vinyl group
It refers to a kind of resin and its copolymers with hydrocarbon structure as the main chain and non alkane substituent as the side chain, including polyvinyl chloride and polytetrafluoroethylene
Olefins, polytetrafluoroethylene and polyperfluoroethylene.
3. Polyamides
It refers to a kind of resin containing amide group in macromolecular chain, including PA6, PA66, PA610, PA46, PA1010, PA11 and PA12
And PI.
4. Polyester
It refers to a kind of resin with ester structure in macromolecular chain, including many kinds, such as pet, PBT, up, PMMA, PC
POM, par, PSF, PES, PPO, PPS, etc.
5. Other types
There are cellulose, polyurethane, phenolic, amino resin and epoxy resin.
3、 According to the application of resin
1. General purpose plastics
It refers to a kind of resin with large output, wide application range, good molding and processing, and low cost. Specific varieties include polyethylene, polypropylene, PVC
Polystyrene, phenolic resin, amino resin, unsaturated polyester and epoxy resin. General plastics are mainly used in packaging, construction, agriculture and daily use.
2. Engineering plastics
It refers to a kind of plastic with good mechanical properties, high dimensional stability and can be used at a higher temperature. It has properties close to metal and can be used for junction
Structural products such as machinery, electronics, automobile, aviation and other fields.
3. General plastics
It refers to a kind of plastic with small amount, wide application range and general performance. Mainly including polymethylmethacrylate, polyurethane, fluoroplastics and
Chlorinated polyether, etc.
4. Special plastics
A class of plastics with unique properties, high price, small output and narrow application range. Mainly including heat-resistant plastics, barrier plastics and conductive plastics
Such as polyphenylene sulfide, polysulfone, polyimide, polyaniline and ethylene% vinyl alcohol copolymer.