Jiuzhi Plastics Net - the five general plastics

1.PE

Polyethylene is the highest yield in the plastics industry. Polyethylene is a thermoplastic resin obtained by polymerizing ethylene. Industrially, copolymers of ethylene and a small amount of an α-olefin are also included. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature can reach -100~-70 °C), good chemical stability, and can resist most acid and alkali corrosion (not resistant to oxidation) Nature of acid). It is insoluble in common solvents at room temperature, has low water absorption and excellent electrical insulation. Polyethylene is generally used in plastic wrap, vest-type plastic bags, plastic food bags, baby bottles, kettles, and the like.

2.PP

Polypropylene is a thermoplastic resin obtained by polymerizing propylene. Polypropylene is a non-toxic, odorless, tasteless, milky white high crystalline polymer with a density of only 0.90--0.91 g/cm3, which is one of the lightest varieties of all plastics. It is particularly stable to water, with a water absorption rate of only 0.01% and a molecular weight of about 811,000. Good formability, but due to large shrinkage rate (1%~2.5%). Thick-walled products are easy to sag. For some parts with high dimensional accuracy, it is difficult to meet the requirements, and the surface gloss of the product is good. Polypropylene is generally used in microwave ovens, pots, plastic buckets, woven bags, and the like.

3.PVC

Polyvinyl chloride is a polymer of vinyl chloride monomer in an initiator such as a peroxide or an azo compound; or a polymer obtained by a free radical polymerization mechanism under the action of light or heat. PVC materials are often added with stabilizers, lubricants, auxiliary processing agents, impact agents and other additives in actual use. It has non-flammability, high strength, weather resistance and excellent geometric stability. Polyvinyl chloride is generally used in plastic wrap, plastic shoes and leather products, films, plastic bags. Special Note: When PVC is made of soft plastic such as plastic wrap or plastic bag, a large amount of auxiliary materials must be added, some of which are toxic. The harmful substances in this material may cause cancer after being released.

4.PS

Polystyrene refers to a polymer synthesized by free radical addition polymerization of styrene monomer. It is a colorless and transparent thermoplastic with a glass transition temperature higher than 100 ° C, so it is often used to make various Disposable containers that need to withstand the temperature of boiling water, as well as disposable foam lunch boxes. In addition, polystyrene is also used in combs, boxes, ballpoint pens, children's toys, plastic shopping bags, and the like. Special attention: When producing disposable tableware, a large amount of illegal additives such as heavy metals will be used, and water, vinegar, oil, etc. contained in the food will dissolve each other and enter the human body, which may cause diseases such as indigestion, local pain and liver system diseases.

5.ABS

ABS is an acrylonitrile-butadiene-styrene copolymer. ABS is a thermoplastic polymer structure with high strength, good toughness and easy processing. The ABS resin is a terpolymer of acrylonitrile, 1,3-butadiene, and styrene. It can be normal in the environment of -25 ° C ~ 60 ° C, and has good formability, the surface of the processed product is smooth, easy to dye and electroplating. Moreover, it can be blended with a variety of resins into a blend. ABS is mainly used for alloys, plastics and ABS grades.