Method for preparing polychloroethylene with high polymerization degree

• Main Authors: CHEN FANRONG, SHU WENXIAO, HAN JINMING, SU LANHUI, WU YUPENG
• Format: Patent
• Language: Chinese; English
• Published: 18.03.2009
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention provides a method for preparing polyvinyl chloride with high polymerization degree. A mixed monomer, a dispersing agent, an initiator, soft water, a pH regulator and a composite chain extender are added into a polymerization kettle for suspension copolymerization reaction. The method is characterized in that the composite chain extender is a complex system formed by a chain extender and a chain transfer agent, wherein the chain extender can be one or more than one of diallyl fumarate, diallyl isophthalate and diallyl maleate, and the chain transfer agent can be one or more than one of lauryl mercaptan, mercaptoethanol, carbon terabromide, trichlorethylene, and thioglycollic acid alpha-ethyl hexaester; and the weight ratio of the chain extender to the chain transfer agent is between 2.8 to 1 and 3.2 to 1, and the total addition amount is between 0.08 and 0.15 percent. The complex system of the chain extender and the chain transfer agent can shorten the reaction time, solve the problem of the hard