Jingyuan Polyethylene

Polyethylene (PE) is the most produced variety among general-purpose synthetic resins, mainly including low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), and some products with special properties. Polyethylene is a white, waxy, semi-transparent material that is soft and tough, lighter than water, non-toxic, and has excellent dielectric properties. Flammable and continues to burn after being removed from the fire source. It has a low water permeability but a relatively high permeability to organic vapor. It is insoluble in any known solvent at room temperature. Above 701, it can be slightly dissolved in solvents such as toluene, amyl acetate, and trichloroethylene. Polyethylene has excellent chemical stability. At room temperature, it is resistant to various chemical substances such as hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, and potassium hydroxide. However, nitric acid and sulfuric acid have a strong destructive effect on polyethylene.

Types of polyethylene

(1) LDPE: Low-density polyethylene, high-pressure polyethylene (2)LLDPE: Linear low-density polyethylene

(3) MDPE: Medium-density polyethylene, Bimodal polyethylene

(4) HDPE: High-density polyethylene, low-pressure polyethylene (5)UHMWPE: Ultra-high molecular weight polyethylene

(6) Modified polyethylene: CPE, cross-linked polyethylene (PEX)

(7) Ethylene copolymers: ethylene-propylene copolymers (plastics), EVA, ethylene-butene copolymers, ethylene-other olefins (such as octene POE, cycloolefins) copolymers, ethylene-unsaturated ester copolymers (EAA, EMAA, EEA, EMA, EMMA, EMAH)

Chemical properties and applications of polyethylene

Polyethylene has excellent chemical stability. At room temperature, it is resistant to various chemical substances such as hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, and potassium hydroxide. However, nitric acid and sulfuric acid have a strong destructive effect on polyethylene. Polyethylene is prone to photo-oxidation, thermal oxidation and ozone decomposition. Under the action of ultraviolet rays, it is easy to degrade. Carbon black has an excellent light shielding effect on polyethylene. After exposure to radiation, reactions such as cross-linking, chain breaking, and the formation of unsaturated groups may occur. -CH2-CH2- n, abbreviated as PE, is a thermoplastic resin produced by the polymerization of ethylene. In industry, it also includes copolymers of ethylene and a small amount of A-olefins. Polyethylene is odorless, non-toxic, and has a waxy feel. It has excellent low-temperature resistance (the lowest service temperature can reach -70 to -100℃), good chemical stability, and can resist the erosion of most acids (except for oxidizing acids). At room temperature, it is insoluble in common solvents, has low water absorption, and excellent electrical insulation performance. However, polyethylene is highly sensitive to environmental stress (chemical and mechanical effects) and has poor heat aging resistance. The properties of polyethylene vary by variety and mainly depend on its molecular structure and density. Products with different densities (0.91 to 0.96g/cm³) can be obtained by adopting different production methods. Polyethylene can be processed by the common molding methods for thermoplastics (see plastic Processing). It has a wide range of uses, mainly for manufacturing films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can also be used as high-frequency insulating materials for televisions, radars, etc.