Polypropylene is a polymer formed by addition polymerization of propylene. It is a white waxy substance with a transparent and light appearance. The density is 0.89 ~ 0.9 1g/cm3, flammable, the melting point is 165℃, it softens around 155℃, and the service temperature range is -30 ~ 140℃. It can resist the corrosion of acid, alkali, salt solution and various organic solvents below 80℃, and can be decomposed under high temperature and oxidation.
Polypropylene is widely used in the production of clothing, blankets and other fiber products, medical equipment, automobiles, bicycles, parts, transportation pipelines, chemical containers and so on. It is also used for the packaging of food and medicine.
Extended data:
Gas phase bulk method of pp material:
Process characteristics:
No solvent is introduced into (1) system, and propylene monomer is polymerized in gas phase in the reactor;
(2) Short process, less equipment, safe production and low production cost;
(3) Polymerization reactors include fluidized bed (bicarbonate/Shell UNIPOI process), vertical stirred bed (BASF Novolen process) and horizontal stirred bed (Amoco/El Paso process).
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