Depending on the scope of application, PVC can be divided into: general-purpose PVC resin, high degree of polymerization PVC resin, cross-linked PVC resin. The common type PVC resin is formed by polymerization of vinyl chloride monomer under the action of Initiator. PVC resin with high polymerization degree is a resin which is polymerized by adding chain growth agent in the vinyl chloride monomer polymerization system, and cross-linked PVC resin is a resin which is polymerized by adding the crosslinking agent containing the diene and the poly 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 (the Ethylene method and the imported monomer method are customarily referred to as ethylene method).
According to polymerization method, polyvinyl chloride can be divided into four categories: suspension polyvinyl chloride, emulsion polyvinyl chloride, bulk polyvinyl chloride, solution method polyvinyl chloride. Suspension polyvinyl chloride is one of the largest production varieties, accounting for about 80% of total PVC production. Suspension polyvinyl chloride according to absolute viscosity of six models: XS-1, XS-2 ... Xs-6;xj-1, XJ-2 ..., XJ-6. The meaning of each letter in the model: X-suspension method; s-loose type; J Compact type.
According to the amount of plasticizer, PVC plastic 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 of situable, soft PVC, plasticizer content of 30-70%; PVC paste Plastic, plasticizer content of 80 Above。