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1、Task 7-1 Understand PVC3Learning Goal1 24Brief description of the properties of PVCBrief description of the classification of PVCBrief description of the application scope of PVCBrief description of polymerization method of PVCLearning Goal3Understand PVCWhat is it?Washing powder?Salt?Baking soda?.N
2、o,no,no,this is PVC powder.Properties of PVC(1)The chemical formula(CH2CHCl)n and the degree of polymerization is 5901500.(2)The average formula quantity is 3687093750;(3)Appearance:white powder;(4)Relative Density 1.351.45(5)Heat capacity 1.0451.463 J/g.temperature(0100)(6)Particle diameter 60150 u
3、m(7)The softening point is 7585 (8)The thermal decomposition point 100 begins to degrade and release hydrogen chloride;Properties of PVC(9)Combustion properties can be burned and degraded in a flame,releasing hydrogen chloride,carbon monoxide and benzene,etc.,but it is self-extinguishing when it lea
4、ves the flame(10)The electrical PVC has the higher density,the electric breakdown resistance,the aging resistance,which can be used for 10000 V low voltage cable and the cable sheath(11)Solvent resistance Except for aromatic hydrocarbons,HCFCs,ketones and esters,it is more stable to water,gasoline,a
5、lcohol,etc.(12)The acid-alkali resistance is stable in acid,alkali medium and salt solution(13)Under the action of light and oxygen,PVC resin decomposes gradually,that is agingUse of PVCClassification of PVCClassification of PVCSoftness and hardnessSoft polyvinyl chloride hard polyvinyl chlorideDegr
6、ee of polymerizationGeneral PVC,High-Polymerization PVC,Cross-linked PVCSource of raw materialsCalcium carbide-acetylene PVC,natural gas-acetylene PVC,ethylene oxychloride PVCProduction method of PVCProduction method of PVCSuspension polymerizationA polymerization method in which vinyl chloride mono
7、mer is suspended in water in the form of droplets.Suspension law accounts for about 90%of the total output.Ontology polymerizationA polymerization method using vinyl chloride monomer as the main body with(or without)a small amount of initiator.Emulsion polymerizationMethod for polymerization of monomers in water.Solution polymerizationMethod for polymerization of monomers and initiators in suitable solvents.Types and uses of PVCPVC Type,Grade and Main UsesSummary1.Properties of PVC2.Application scope of PVC3.Classification of PVC4.Method of polymerization of PVC
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