PVC resin
PVC is a PVC plastic with bright color, corrosion resistance, firmness and durability. Due to the addition of plasticizer, anti-aging agent and other toxic auxiliary materials in the manufacturing process, its products generally do not store food and drugs.
PVC is actually a vinyl polymer. To put it simply, the aqueous solution of salt undergoes chemical decomposition under the action of electric current. This process produces chlorine, caustic soda and hydrogen. Refining and cracking petroleum or gasoline can produce ethylene. When chlorine and ethylene are mixed, dichloroethylene will be produced; Dichloroethylene can also be converted into chlorinated vinyl, which is a basic component of PVC. During polymerization, chlorinated vinyl molecules are linked together to form a PVC chain. The PVC produced in this way is white powder. It cannot be used alone, but can be mixed with other ingredients to produce many products.
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PVC has the outstanding characteristics of rich raw materials (petroleum, limestone, coke, salt and natural gas), mature manufacturing process, low price, wide use, etc. It has become the second largest general resin in the world after polyethylene resin, accounting for 29% of the total consumption of synthetic resin in the world. PVC is easy to process, and can be processed by molding, lamination, injection molding, extrusion, calendering, blow molding, etc. PVC is mainly used to produce plastic soft products such as artificial leather, film, wire sheath, etc. It can also produce plastic hard products such as plates, doors and windows, pipes and valves.
PVC has the advantages of flame retardancy (flame retardancy value is above 40), high chemical resistance (resistance to concentrated hydrochloric acid, sulfuric acid with concentration of 90%, nitric acid with concentration of 60% and sodium hydroxide with concentration of 20%), good mechanical strength and electrical insulation. However, its heat resistance is poor, the softening point is 80 ℃, and it starts to decompose and discolor at 130 ℃, and HCI is precipitated.
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