Main Classification Of Pvc

According to the different scope of application, PVC can be divided into: general-purpose PVC resin, high degree of polymerization PVC resin, cross-linked PVC resin. Universal PVC resin is formed by polymerization of vinyl chloride monomer under the action of initiator; PVC resin with high degree of polymerization refers to the resin polymerized by adding chain growth agent in vinyl chloride monomer polymerization system; Crosslinked PVC resin is polymerized by adding a crosslinking agent containing dienes and polyenes 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 imported (EDC, VCM) monomer method (ethylene method and imported monomer method are commonly 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 the largest variety, accounting for about 80% of the total output of PVC. Suspension PVC is divided into six types according to the 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 amount of plasticizer content, PVC plastic olefin plastics are often divided into: non plasticized PVC, plasticizer content is 0; Rigid PVC with plasticizer content less than 10%; Semi rigid PVC with plasticizer content of 10-30%; Soft PVC with plasticizer content of 30-70%; The content of plasticizer in PVC paste plastic is more than 80%.