Polyvinyl chloride (PVC for short) is an important organic synthetic material in China. Its products have good physical and chemical properties and are widely used in industry, construction, agriculture, daily life, packaging, power public utility And other fields.

From the perspective of product classification, PVC belongs to the synthetic resin category of the three major synthetic materials (synthetic resin, synthetic fiber, synthetic rubber (information, market)), including five major general-purpose resins, polyethylene PE, polyvinyl chloride PVC, polypropylene PP, polystyrene PS, and ABS resins.

Introduction to PVC

Polyvinyl chloride is a non-toxic, odorless white powder. It has high chemical stability and good plasticity. Except for a few organic solvents, it can withstand any concentration of hydrochloric acid, less than 90% sulfuric acid, 50-60% nitric acid and less than 20% caustic soda at normal temperature, and is also quite stable for salts; PVC has poor thermal stability and light resistance. It can start to decompose and release hydrogen chloride (HCl) gas above 140 ℃, causing discoloration of PVC. It has excellent electrical insulation and generally does not burn. It can burn on the flame and emit HCl, but it will self extinguish when leaving the flame. It is a "self extinguishing" and "flame retardant" substance. It is mainly used to produce transparent sheets, 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.

PVC is made of vinyl chloride monomer through free radical polymerization. The polymerization degree n is generally in the range of 500~20000. Its molecular structure formula is as follows: