What are the main categories of PVC?

According to the different scope of application, PVC can be divided into general PVC resin, high degree of polymerization PVC resin and cross-linked PVC resin. Universal PVC resin is formed by polymerization of vinyl chloride monomer under the action of initiator; High degree of polymerization PVC resin refers to the resin polymerized by adding chain growth agent in the vinyl chloride monomer polymerization system; Crosslinked PVC resin is a resin polymerized by adding a crosslinking agent containing diene and polyene into 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 imported (EDC, VCM) monomer method (traditionally, the ethylene method and imported monomer method are collectively referred to as ethylene method).
According to polymerization methods, PVC can be divided into four categories: suspension PVC, lotion PVC, bulk PVC and solution PVC. Suspension PVC is a large variety, accounting for about 80% of the total production of PVC. Suspension PVC is divided into six types according to its 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 is often divided into: unplasticized PVC, the content of plasticizer is 0; Rigid PVC, plasticizer content less than 10%; Semi-rigid PVC with plasticizer content of 10-30%; Soft PVC with plasticizer content of 30-70%; PVC paste plastic with plasticizer content of more than 80%.
(The article is selected from Baidu Encyclopedia)