PVC suspension polymerization
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PVC suspension polymerization
The monomer is suspended and dispersed in the aqueous phase in a microdroplet manner, and the selected oil-soluble initiator is dissolved in the monomer, and the polymerization reaction is carried out in the droplets, and the polymerization heat is absorbed by water in time, in order to ensure the droplets In the form of beads dispersed in water, it is necessary to add a suspension stabilizer such as gelatin, polyvinyl alcohol, methyl cellulose, hydroxyethyl cellulose or the like. Most of the initiators use organic peroxides and azo compounds, such as diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate, diethylhexyl peroxydicarbonate and azobisisoheptanenitrile, and Nitrogen diisobutyronitrile and the like. The polymerization was carried out in a polymerization vessel with a stirrer. After polymerization, the material flows into a monomer recovery tank or a stripper to recover the monomer. Then, it flows into the mixing kettle, is washed with water, centrifuged and dehydrated, and dried to obtain a finished resin product. The vinyl chloride monomer should be removed from the resin as much as possible. For PVC for food packaging, the free monomer content should be controlled below 1ppm. In order to ensure that a resin having a specified molecular weight and molecular weight distribution range is obtained during polymerization and to prevent explosion, it is necessary to control the temperature and pressure of the polymerization process. The particle size and particle size distribution of the resin are controlled by the agitation speed and the choice and amount of suspension stabilizer. The quality of the resin is characterized by particle size and particle size distribution, molecular weight and molecular weight distribution, apparent density, porosity, fisheye, thermal stability, color, impurity content, and free flow of the powder. Convergence