Blister packaging machine blister polyvinyl chloride emulsion polymerization method

One of the earliest industrial production methods of PVC. In emulsion polymerization, in addition to water and vinyl chloride monomers, surfactants such as sodium alkyl sulfonate are added as emulsifiers, so that the monomers are dispersed in the water phase to form an emulsion, and water-soluble potassium persulfate or Ammonium persulfate is used as an initiator, and an "oxidation-reduction" initiation system can also be used. The polymerization process is different from the suspension method. There are also added polyvinyl alcohol as an emulsion stabilizer, dodecyl mercaptan as a regulator, and sodium bicarbonate as a buffer. There are three kinds of polymerization methods: batch method, semi-continuous method and continuous method. The polymerized product is in the form of a latex, and the particle size of the emulsion is 0.05-2 μm, which can be directly applied or spray-dried into a powdery resin. The emulsion polymerization method has a short polymerization period and is easy to control. The obtained resin has a high molecular weight and a relatively uniform degree of polymerization. It is suitable for making polyvinyl chloride paste, making artificial leather or impregnating products. The formula of emulsion polymerization is complex, and the product has a high impurity content.