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PVC, the world's largest production of generic plastics, you know?

PVC, the world's largest production of generic plastics, you know?

PVC (polyvinyl chloride) for the purpose of production in the world's largest and most widely general plastic, its superior characteristics and cost-effective favored by all walks of life, and many products of raw materials have been rapidly replaced by PVC, PVC plastic in our life has become a indispensable part of the daily necessities, electrical appliances, we use the charger, mobile phone, PVC wire, computer, etc. Products are made by PVC material. So the impact of PVC is huge.

PVC, the world's largest production of generic plastics, you know?

What is PVC?

Polyvinyl chloride (PVC), English abbreviation of PVC (Polyvinyl chloride), vinyl chloride monomer (vinyl chloride monomer, VCM) such as peroxide, azo compound initiator; Or a polymer formed by polymerization mechanism of free radical under the action of light and heat. The vinyl chloride homopolymer and the vinyl chloride copolymer series are called vinyl chloride resins. PVC for amorphous structure of white powder, branched degree is small, relative density 1.4, glass transition temperature of 77 ~ 90 ℃, 170 ℃ or so began to decompose to heat and light stability, in more than 100 ℃ or the sun for a long time, will decompose and produce hydrogen chloride, and further automatic catalytic decomposition, cause discoloration, physical and mechanical properties also fell rapidly, must be added in the practical application of stabilizers in order to improve the stability of heat and light.

The composition of PVC

Polyvinyl chloride is a polymer that USES a chlorine atom to replace a hydrogen atom in polyethylene. The structure of this material is as follows: [-- CH2 -- CHCl --]n. PVC is a linear polymer with most VCM monomers connected by head - tail structure. Carbon atoms are arranged in a zigzag pattern, with all atoms connected to each other by a row bond. All carbon atoms are sp3 hybridization.

Main classification of PVC

According to the application range, PVC can be divided into general PVC resin, high degree of polymerization PVC resin, crosslinked PVC resin. General PVC resin is formed by polymerization of vinyl chloride monomer under the action of initiator. High polymerization degree PVC resin refers to the resin formed by adding chain growth agent into the polymerization system of vinyl chloride monomer. The crosslinked PVC resin is a resin which is prepared by the crosslinking agent of diene and polyene in the polymerization system of vinyl chloride monomer.

The main application of PVC

In building materials, industrial products, daily necessities, plastic flooring, floor tile, artificial leather, pipe, wire and cable, packaging film, bottle, foaming materials, sealing materials, fiber, fiber wire skin, skin, shoes, handbags, bags, decorations, signs and billboards, architectural decoration supplies, furniture, hang act the role ofing, roller, pipes, toys, curtains, rolling door, auxiliary medical supplies, gloves, food tin foil and so on all has a wide range of applications.

PVC material processing

Polyvinyl chloride (PVC) plastics have different shapes and different processing methods, and can be compressed, extruded, injected and coated. The particle size, fish-eye, density, purity, foreign impurity and porosity of polyvinyl chloride resins all affect the processing performance. The viscosity and gelatinization of paste should be considered.

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