Depending on the scope of application, PVC can be divided into: general-purpose PVC resin, high polymerization degree of PVC resin, cross-linked PVC resin. The general type PVC resin is formed by polymerization of vinyl chloride monomer under the action of initiator; The high polymerization degree PVC resin is the resin which is polymerized by adding the chain growth agent in the vinyl chloride monomer polymerization system. The crosslinking PVC resin is a resin which is polymerized from the crosslinking agent containing diene and alkene in the vinyl chloride monomer polymerization system.
According to the method of obtaining vinyl chloride monomer, it can be divided into calcium carbide method, ethylene method and import (EDC, VCM) monomer method (it is customary to refer to ethylene method and import monomer method collectively as Ethylene method).
According to polymerization method, polyvinyl chloride can be divided into four categories: suspension method Polyvinyl chloride, emulsion method polyvinyl chloride, bulk polyvinyl chloride, solution method polyvinyl chloride. Suspension polyvinyl chloride is the largest production of a species, accounting for about 80% of PVC production. Suspension of PVC According to absolute viscosity of six models: XS-1, XS-2 ... XS-6, XJ-1, XJ-2, XJ-6. The meanings of the letters in the model: X-suspension method; s-lax type; J Compact type.
According to the amount of plasticizer, PVC plastic is often divided into: no plasticized PVC, Plasticizer content of 0, rigid PVC, plasticizer content is less than 10%, semi-rigid PVC, plasticizer content is $number, soft PVC, plasticizer content is $number, pvc paste plastic, plasticizer content of more than 80%.