PVC: polyvinyl chloride (PolyVinyl Chloride: PVC) is a polymer that uses a chlorine atom instead of a hydrogen atom in polyethylene. PVC is an amorphous white powder with less degree of branching. The molecular weight of PVC in industrial production is generally in the range of 5~12 million, with great polydispersity, and the molecular weight increases with the decrease of polymerization temperature. Without fixed melting point, 80~85 began to soften at 130 degrees C and became viscoelastic at 160~180. Its tensile strength is about 60MPa, the impact strength is 5~10kJ/m2, and it has excellent dielectric properties.
The stability of light and heat, at 100 DEG C or after long time exposure to sunlight, will decompose and produce hydrogen chloride, and automatic catalytic decomposition of change, in the practical application must be added in order to improve the stability of heat and light stabilizer of the. PVC is very hard and can only be dissolved in a few solvents such as cyclohexanone, two dichloroethane and tetrahydrofuran. It is stable for organic and inorganic acids, alkalis and salts, and the chemical stability decreases with the increase of the use temperature.
Is the PVC material, with thermal insulation, sealing and damping characteristics are widely used in household appliances, automobile manufacturing rubber products, but also in the production process, in order to make PVC become soft and need to add plenty of plasticizer, the plasticizer is easy to be released at high temperature, contact the human body will harm good health. Because of its harm to human body, countries such as Europe, America, Japan and South Korea are restricting the products which use PVC as raw material.
