Polrvinyl chloride heat-resistance modifier and preparation method thereof

Abstract

The invention discloses a polrvinyl chloride heat-resistance modifier and a preparation method thereof. The heat-resistance modifier is a methyl methacrylate-alpha-methyl styrene-N-phenylmaleimide terpolymer. Methyl methacrylate and alpha-methyl styrene account for 60 to 80 percent of the total mass of the modifier, N-phenylmaleimide terpolymer accounts for 20 to 40 percent of the total mass of the modifier, and the mass ratio of methyl methacrylate to alpha-methyl styrene is 1:1; and in a polymerization process, the mass ratio of monomer to water is (30-40):(60-70), the polymerization temperature is 60 to 80 DEG C, a peroxide initiator, an alkyl sulfate or alkane sulfonate emulsifier and a thiol molecular weight regulator are added at the same time, the reaction time is 6 to 9 hours, anda pressure type spray dryer is used for spray drying in a post-treatment process. Compared with the conventional heat-resistance modifier, the performance is high, the form of product particles is desirable, the yield is high, fewer raw material varieties are adopted, the cost is low, the spray drying post-treatment process is simple, and the Vicat softening point of the prepared heat-resistance modified resin is obviously improved, and the processability is high.

Description

technical field

[0001] The invention belongs to the field of modifier preparation, and in particular relates to a polyvinyl chloride heat-resistant modifier and a preparation method thereof. Background technique

[0002] As we all know, the usual polyvinyl chloride (PVC) processing has the following disadvantages: high brittleness, poor thermal stability, low heat distortion temperature, and Vicat softening point is only about 85°C. These disadvantages limit the scope of use of PVC resin. Although the use of CPE, MBS, ACR and other additives basically solves the impact resistance and processability problems of PVC, it fails to solve the heat resistance problem.

[0003] For this reason, people have adopted the method of preparing chlorinated polyvinyl chloride (CPVC) to modify, although this method can increase the glass transition temperature of PVC, but its thermal stability, processability and impact resistance have declined, and the application Subject to certain restr...