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Chemical properties of polyethylene liquid bottles

Carrie Oct 09,2019 Share this post:

The main raw material of the polyethylene liquid bottle is polyethylene. The PE is a thermoplastic resin obtained by polymerizing ethylene. Polyethylene is generally used to make plastic polyethylene bottles more. 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). The polyethylene bottle is insoluble in common solvents at normal temperature, has low water absorption and excellent electrical insulation.

twin neck bottle

The polyethylene liquid bottle has good chemical stability and can withstand dilute nitric acid, dilute sulfuric acid and any concentration of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia, amines, hydrogen peroxide, sodium hydroxide and potassium hydroxide at room temperature. Wait for the solution. However, it is not resistant to strong oxidizing corrosion, such as fuming sulfuric acid, concentrated nitric acid, a mixture of chromic acid and sulfuric acid. The above solvent will slowly erode the polyethylene at room temperature, and at 90-100 ° C, concentrated sulfuric acid and concentrated nitric acid will quickly erode the polyethylene to destroy or decompose.

Under the action of the atmosphere, sunlight and oxygen, polyethylene bottles will age, discolor, crack, become brittle or chalk, and lose their mechanical properties. At the molding processing temperature, the melt enthalpy is also lowered due to oxidation, and discoloration and streaking occur. Therefore, attention should be paid during molding processing, use, or material selection.

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