Polyvinyl acetate polymerization method

[0018] Now to process The PVAc is example, non-limiting embodiment is described as follows:

[0019] 1. Ingredients

[0020] Take VAC 1000L (approximately 930kg) with a purity of 99.3%, add 200L of methanol and put it into a polymerization kettle equipped with a stirrer and a reflux condenser.

[0021] Take 0.47kg of initiator AIBME (0.05% of VAc mass) to prepare a methanol solution with a concentration of 0.8-1.5%.

[0022] 2. Polymerization

[0023] When the monomer is preheated to 59°C, add the methanol solution of initiator and chain transfer agent, polymerize at 65°C for 2 hours at a stirring speed of 5-9 rpm, then reduce the speed to 4-7 rpm, continue Polymerized for 2 hours.

[0024] 3. Separation

[0025] After the polymerization reaction is finished, the reaction liquid is transferred to a still, and methanol vapor is blown into from the bottom of the still to collect the distilled VAc, methanol and water azeotrope. Inside the kettle is PVAc methanol solution.