Main classification According to the scope of applicati […]
Main classification
According to the scope of application, PVC can be divided into: general-purpose PVC resin, high-polymerization PVC resin, cross-linked PVC resin. The general-purpose PVC resin is formed by polymerization of vinyl chloride monomer under the action of an initiator; the high polymerization degree PVC resin refers to a resin obtained by polymerizing a chain extender in a vinyl chloride monomer polymerization system; the crosslinked PVC resin is A resin obtained by polymerizing a crosslinking agent containing a diene and a polyene into a vinyl chloride monomer polymerization system.
According to the method for obtaining vinyl chloride monomer, it can be divided into calcium carbide method, ethylene method and imported (EDC, VCM) monomer method (the ethylene method and the imported monomer method are commonly referred to as ethylene method).
According to the polymerization method, polyvinyl chloride can be classified into four major categories: suspension polyvinyl chloride, emulsion polyvinyl chloride, bulk polyvinyl chloride, and solution polyvinyl chloride. The suspension method of polyvinyl chloride is the largest variety of production, accounting for about 80% of the total PVC production. The suspension method of polyvinyl chloride is divided into six models according to absolute viscosity: 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-tight type.
According to the content of plasticizer, PVC plastic olefin plastic is often divided into: no plasticized PVC, plasticizer content is 0; rigid PVC, plasticizer content is less than 10%; semi-rigid PVC, plasticizer content It is 10-30%; soft PVC, plasticizer content is 30-70%; polyvinyl chloride paste plastic, plasticizer content is more than 80%.
