Common knowledge of PVC

2022-09-23 14:16:30 Rowling

Common knowledge of PVC

Main classification

According to the different scope of application, PVC can be divided into: 

general PVC resin, high degree of polymerization PVC resin, cross-linked PVC resin. General-purpose PVC resin is formed by the polymerization of vinyl chloride monomer under the action of an initiator; high degree of polymerization PVC resin refers to a resin that is polymerized by adding a chain extender to the vinyl chloride monomer polymerization system; cross-linked PVC resin is A resin obtained by adding a crosslinking agent containing diene and polyene to the vinyl chloride monomer polymerization system.

According to the method of obtaining vinyl chloride monomer, it can be divided into calcium carbide method, ethylene method and imported (EDC, VCM) monomer method (the ethylene method and the imported monomer method are commonly referred to as the ethylene method).

According to the polymerization method, PVC can be divided into four categories: suspension method PVC, emulsion method PVC, bulk method PVC, solution method PVC. Suspension-processed polyvinyl chloride is the one with the largest output, accounting for about 80% of the total output of PVC. Suspension PVC is divided into six models according to absolute viscosity: XS-1, XS-2...XS-6; XJ-1, XJ-2..., XJ-6. The meaning of each letter in the model: X-suspension method; S-loose type; J-tight type.

According to the content of plasticizer, PVC plastics are often divided into: non-plasticized PVC, plasticizer content is 0; rigid PVC, plasticizer content is less than 10%; semi-rigid PVC, plasticizer content For soft PVC, the plasticizer content is 30-70%; for PVC paste plastic, the plasticizer content is more than 80%.

Preparation method

PVC Polyvinyl chloride can be made by substitution reaction of ethylene, chlorine and catalyst. Due to its fire and heat resistance, PVC is widely used in a variety of products in all walks of life: wire sheathing, optical fiber sheathing, shoes, handbags, bags, accessories, signs and billboards, building decoration products, furniture, hanging accessories , rollers, hoses, toys, curtains, rolling doors, auxiliary medical supplies, gloves, cling wrap for certain foods, certain fashions, etc.

Author Rowling


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