Material, advantages and disadvantages of PE chopping board (chopping board)

The advantage of PE chopping board is light weight and easy to carry. The disadvantage is that it hurts the kitchen knife.

Polyethylene (PE) is a thermoplastic resin polymerized from ethylene. In industry, it also includes * * * polymers of ethylene and a small amount of α-olefins. Polyethylene is odorless and non-toxic, feels like wax, and has excellent low temperature resistance (the lowest service temperature can reach-100 ~-70℃), good chemical stability and resistance to most acids and bases (not oxidative acids). Insoluble in general solvents at room temperature, low water absorption and excellent electrical insulation.

Polyethylene plastic is mainly used for water supply and drainage pipes and sanitary ware in buildings.

Extended data

nature

1. polyethylene has excellent chemical stability, and can resist the corrosion of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, potassium hydroxide and other chemicals at room temperature, but nitric acid and sulfuric acid have a strong destructive effect on polyethylene.

2. Polyethylene is prone to photooxidation, thermal oxidation and ozone decomposition, and is easily degraded under the action of ultraviolet rays. Carbon black has a good shading effect on polyethylene. After irradiation, crosslinking, chain breakage and the formation of unsaturated groups will occur.

An opalescent translucent thermoplastic is made of ethylene homopolymerization and a small amount of α -olefin polymerization. The density is 0.86-0.96g/cm3. According to density, there are low density polyethylene (including linear low density polyethylene) and ultra-low density polyethylene. Odorless and nontoxic. Resistant to chemicals, insoluble in solvents at room temperature. Low-temperature resistance, the lowest use temperature is -70 ~- 100℃. Good electrical insulation and low water absorption. Physical and mechanical properties vary with density.

Industrial low-density polyethylene mainly adopts high-pressure (1 10 ~ 200mpa) and high-temperature (150 ~ 300℃) free radical polymerization. Others use low-pressure coordination polymerization, and sometimes the same set of equipment can produce polyethylene products with density of 0.87 ~ 0.96 g/cm3, which is called full-density polyethylene process technology. Polyethylene can be processed into films, wire and cable sheaths, pipes, various hollow products, injection molded products, fibers and so on. Widely used in agriculture, packaging, electronics, machinery, automobiles, daily necessities and so on.

References:

Polyethylene _ Baidu encyclopedia