What are the three types of plastic products?

Plastic product material classification

Many people know that plastic products are made of plastic, but the materials of plastic products are also divided into many kinds of materials. Let me organize the following three categories for you:

According to the scope of application, it can be divided into: general plastics, engineering plastics, special engineering plastics

1. General-purpose plastics for plastic products

1. General-purpose plastics, a type of plastic with a particularly large output, a wide range of uses, and a low price. Mainly include PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), PS (polystyrene), PF (phenolic plastic) and amino plastic. Their total output accounts for more than 75% of the total output of plastics. Many plastic products used in people's daily life are made of these general-purpose plastics.

Two, plastic products engineering plastics

2. Engineering plastics, long-term use temperature is 100-150 degrees. It can withstand a certain external force, has good mechanical properties and dimensional stability, and can maintain its excellent performance at high and low temperatures. It can be used as a plastic for engineering structural parts. Because of their high mechanical strength or special properties such as high temperature resistance, corrosion resistance, radiation resistance, etc., they can replace metals for certain unloading components or other special purposes. Commonly used are PC (polycarbonate), PA (polyamide), POM (polyoxymethylene), PSF (polysulfone), ABS, PPS (polyphenylene sulfide), CP (chlorinated polyether), PET (poly Ethylene phthalate), PBT (polybutylene terephthalate), UHMWPE (ultra-high relative molecular weight polyethylene), EP (epoxy resin), phenol-epoxy resin and PU (polyurethane), etc. . The tensile strength of engineering (and special) plastics is generally above 50MPa, the flexural modulus is above 2GPa, and the impact strength can reach 60J/m. Engineering plastics have the characteristics of low density, high chemical stability, good mechanical properties, superior electrical insulation, and easy processing and molding. They are widely used in industries such as automobiles, electrical appliances, chemicals, machinery, instruments, and meters.

3. Silicone products, special industrial plastics

3. Special engineering plastics, long-term use temperature is above 150 degrees. Plastics that have high mechanical strength and heat-resistant temperature, or have special functions, and can meet the requirements of special applications. According to whether the polymer is cross-linked or not, it can be divided into cross-linked and fee-cross-linked special engineering plastics. Commonly used cross-linked special engineering plastics include polyamino bismaleamide, polytriazine, cross-linked polyimide, heat-resistant epoxy resin, etc.; commonly used non-cross-linked types include fluoroplastics, silicone, and polyphenylene sulfide , Polyphenylester, Polyetheretherketone and Polybenzimidazole Zuo, etc. Total: PES (polyethersulfone), PPS (polyphenylene sulfide), PAR (polyarylate), PAI (polyamide-imide), PEI (polyetherimide), PEEK (polyether ether ketone) , PI (polyimide), LCP (liquid crystal polymer). It is called high performance plastics in the United States and super engineering plastics in Japan. Its main application areas are the aerospace industry, defense industry, electronics, electrical appliances and machinery manufacturing, especially the automotive industry. It is used as a structural material in rockets, satellites, aerospace, electrical appliances, automotive industry, completed products, medical equipment and sports equipment that require sufficient mechanical properties at high temperatures.

As for how many Chinese plastics there are, this question cannot be answered. It's too much. In terms of price, general-purpose plastics are the cheapest, around a dozen yuan per kilogram, and special engineering plastics are the most expensive, about a few hundred yuan per kilogram, and the quantity is small. In many cases, there is no market.