Introduced into the main chain of vinyl chloride monomer copolymerizable thereof, obtained is a novel polymer comprising mers of the two monomers, this polymer is called a copolymer. Currently copolymers of vinyl chloride with other monomers the main varieties and properties as follows: ⑴ vinyl chloride - vinyl acetate copolymer: introducing vinyl acetate monomer may function as general plasticizer, i.e. plasticized so-called "inner "avoid general plasticizer volatilization, migration, extraction and other shortcomings, but also can reduce the melt viscosity, reduce the processing temperature, to improve the processability. Usually the copolymer of vinyl acetate content of 3 to 14%. Vinyl chloride - vinyl acetate copolymer main disadvantage is that the tensile strength, heat distortion temperature, abrasion resistance, chemical stability and thermal stability decreased. ⑵ vinyl chloride - vinylidene chloride copolymer: the plasticization of the plasticized vinyl chloride copolymer of this softening temperature, solubility and molecular - vinyl acetate copolymer is substantially the same. Its biggest feature is the small water and gas permeability, high solubility in a ketone solvent, and the ability of the dilution effect of aromatics, which can be effectively used for coating. In addition, also used to make shrink films. Due to heat, light stability than the vinyl chloride - vinyl acetate copolymer difference, the higher cost of monomer, so there is no chloride in the application - vinyl acetate widely. 1. Soft polyvinyl chloride containing a plasticizer is generally 30-50%. Because the supply of soft pvc plastic, high strength; has good air tightness and impermeability. 2. Rigid PVC is only a small amount of a plasticizer. Which is characterized by hard texture pvc plastic pipe fittings, high mechanical strength, good chemical resistance. . 3. PVC poor heat resistance, strength influenced by temperature, -20 ℃ 20 ℃, when the intensity ratio dropped to 80%. So pvc plastic parts processing, the film is not easy to keep products at low temperature; soft products temperature does not exceed 45 ℃, hard products does not exceed 60 ℃, the light will be long-term aging embrittlement. 4. PVC film in the processing, in order to prevent thermal decomposition, thermal stabilizer to be added, since the heat stabilizer contains lead salts, so that the PVC is toxic, it can not be used as food packaging. 5. PVC pest control agent in contact with the organic solvent and naphthalene, etc., will produce sticky, melting phenomenon, and easy to absorb odors; more volatile due to the plasticizer, it should not be stored for too long. Shandong pvc plastic parts, pvc plastic, sea Widex Widex provided by Qingdao Rubber Material Co., Ltd. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) strong, credible, in Qingdao, Shandong industrial products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the sea Widex and you work into the brilliant, for a better future!