Some of the major uses of additives in pvc
2014-01-04 by seoer8
Calendula PVC ( polyvinyl chloride ) chemical and physical properties of rigid PVC is one of the most widely used plastic material. PVC material is a non -crystalline materials. PVC material in actual use, often by adding stabilizers , lubricants, auxiliary processing agents, colorants , impact agents and other additives.
PVC is PVC , bright color , corrosion-resistant , durable, due to the increase of the plasticizer , anti-aging agents of some toxic auxiliary materials in the manufacturing process , so its products are generally not stored food and medicine.
In fact, pvc-additive is a vinyl polymeric materials . Briefly, the chemical decomposition of the salt solution at a current effect. This process produces chlorine, caustic soda and hydrogen. Refining, oil or gasoline cracking to produce ethylene. When mixed chlorine and ethylene , will produce ethylene dichloride ; dichloroethene and vinyl chloride can be converted to produce , it is a fundamental part of PVC . The polymerization process of vinyl chloride molecules together form the PVC chain. Polyvinyl chloride generated in this way as a white powder. It can not be used alone , but can be mixed with other ingredients to generate a lot of products.
PVC has abundant raw materials ( oil , limestone , coke , salt and natural gas ) , manufacturing processes mature , inexpensive , versatile , and other prominent features , has become second only to polyethylene resin in the world 's second largest general-purpose resins , accounting 29% of the world's total consumption of synthetic resin . PVC is easy to process , can be processed by molding , lamination , injection molding, extrusion , calendering, blow , etc. . PVC is mainly used for the production of artificial leather, film , cable sheathing and other soft plastic products, also produces lumber, doors, windows, pipes and valves and other hard plastic products. PVC flame ( flame retardant is more than 40 ) , high chemical resistance ( resistance to concentrated hydrochloric acid at a concentration of 90% sulfuric acid concentration of 60% nitric acid and sodium hydroxide concentration of 20% ) , the mechanical strength excellent electrical insulating properties and advantages . But its poor heat resistance , softening point is 80 ℃, color begins to decompose at 130 ℃ and precipitation HCI.