Preparation method of polyvinyl chloride resin with high oil absorption rate

Abstract

The invention provides a preparation method of polyvinyl chloride resin with high oil absorption rate, which is implemented by the following steps of: adding vinyl chloride, deionized water, an initiation system, a dispersion system and a function assistant into a polymerizer; under a certain polymerization temperature, reacting for a certain time, adding a terminator and then obtaining polyvinylchloride suspension; and removing an unreacted vinyl chloride monomer, centrifuging suspension, drying, and obtaining the polyvinyl chloride resin, wherein the function assistant is the mixture of several of C4-C10 nalkane and isoparaffin of the nalkane. By the method disclosed by the invention, the particle state of the polyvinyl chloride resin is improved, the interior of the obtained resin is loose and porous, so that the obtained resin has high voidage, uniform void distribution and high oil absorption rate.

Description

technical field

[0001] The invention belongs to a preparation method of polyvinyl chloride resin, in particular to a preparation method with high oil absorption rate (or high plasticizer absorption rate). Background technique

[0002] Polyvinyl chloride resin (PVC) is the resin with the second largest output in the world. Due to its low price and excellent performance, it has a wide range of applications. The resin can be synthesized by bulk method, emulsion method, and suspension method. In 2009, my country's PVC resin production capacity reached 17 million tons per year, of which the suspension method accounted for about 70-80%. Suspension polyvinyl chloride resin is under the action of dispersant and colloid preservation, the monomer is evenly dispersed in the continuous water phase by strong stirring, and the polymerization is initiated by peroxide or azo initiator at a certain temperature. Formed, the phase state is a typical heterogeneous precipitation polymerization,...

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