Polyethylene has good chemical stability, and can resist dilute nitric acid, dilute sulfuric acid and any concentration of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia water, amines, hydrogen peroxide, sodium hydroxide, potassium hydroxide and other solutions at room temperature. But it is not resistant to strong oxidation corrosion, such as mixed solution of fuming sulfuric acid, concentrated nitric acid, chromic acid and sulfuric acid.
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Chlorosulfonated polyethylene: When polyethylene reacts with chlorine containing sulfur dioxide, some hydrogen atoms in the molecule are replaced by chlorine and a small amount of sulfonyl chloride groups to obtain chlorosulfonated polyethylene. The main industrial method is suspension method. Chlorosulfonated polyethylene has good ozone resistance, chemical corrosion resistance, oil resistance, heat resistance, light resistance, wear resistance and tensile strength. It is an elastomer with good comprehensive performance and can be used to make equipment parts that come into contact with food.
The heat resistance of polyethylene is not high, but increases with the increase of relative molecular weight and crystallinity. Good low temperature resistance, brittle temperature can generally reach below -50℃; With the increase of relative molecular weight, the lowest molecular weight can reach-140℃. The linear expansion coefficient of polyethylene is relatively large, and the highest coefficient can reach (20 ~ 24 )×10-5/k. High thermal conductivity.
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