Polyvinyl chloride (PVC) is a high molecular material which uses a chlorine atom instead of a hydrogen atom in polyethylene, and contains a small amount of amorphous polymer with crystal structure. The structure of this material is as follows: -(CH2-CHCl)n-. PVC is a linear polymer, in which VCM monomers are mostly connected in a head-to-tail structure. Carbon atoms are arranged in a zigzag pattern, and all atoms are connected by σ bonds. All carbon atoms are sp3 hybrid.

Polymerization method:

Polyvinyl chloride is prepared by free radical addition polymerization. Polymerization methods are mainly divided into suspension polymerization, emulsion polymerization and bulk polymerization, with suspension polymerization as the main method, accounting for about 80% of the total PVC production.

Adding pure water, liquefied VCM monomer and dispersant into the reaction kettle, and then adding initiator and other additives. After heating to a certain temperature, VCM monomer undergoes free radical polymerization to generate PVC particles. Continuous stirring makes the particle size uniform, and the generated particles are suspended in water. In addition, there is a kind of resin for PVC paste produced by micro-suspension method, and the product performance and paste-forming performance are good.

Reference to the above content: Baidu Encyclopedia -PVC