According to product classification, PVC belongs to synthetic resins among the three major synthetic materials (synthetic resin, synthetic fiber and synthetic rubber (information and market)), including five general resins, namely polyethylene PE, polyvinyl chloride PVC, polypropylene PP, polystyrene PS and ABS resin.
Brief introduction of PVC
PVC is a nontoxic and odorless white powder. High chemical stability and good plasticity. Except for a few organic solvents, it can resist any concentration of hydrochloric acid, sulfuric acid below 90%, nitric acid below 50-60% and caustic soda below 20% at room temperature, and it is also quite stable to salts. PVC has poor thermal stability and light resistance. Hydrogen chloride (HCl) gas can be decomposed and released above 140℃, resulting in discoloration of PVC. Excellent electrical insulation, generally will not burn, can burn on the flame and release HCl, but will go out by itself when leaving the flame, so it is a kind of "self-extinguishing" and "flame retardant" substance. Mainly used in the production of transparent films, pipe fittings, gold cards, blood transfusion equipment, soft and hard pipes, plates, doors and windows, profiled materials, films, electrical insulation materials, cable sheaths, blood transfusion materials, etc.
Polyvinyl chloride is formed by free radical polymerization of vinyl chloride monomer, and the polymerization degree n is generally in the range of 500~20000.