Coating film removing agent and polymerization method for improving porosity of polyvinyl chloride resin

Abstract

The invention relates to a coating film removing agent and a polymerization method for improving the porosity of a polyvinyl chloride resin, and belongs to the field of polymer polymerization. According to the present invention, the coating film removing agent comprises a glyceride compound and an organic solvent, wherein the glyceride compound is formed by mixing one or more than two materials selected from glyceryl monostearate, mixed glyceryl stearate, glyceryl laurate and glyceryl palmitate according to any ratio, the organic solvent is formed by mixing one or more than two materials selected from benzene, toluene, xylene, acetone, methanol and butanol according to any ratio, and a ratio of the glyceride compound to the organic solvent is 1:3-49; during the polymerization of polyvinylchloride, the use amount of the coating film removing agent is 0.2-15%; and the prepared polyvinyl chloride resin has significantly-increased pore structures on the particle surface, reduced apparentdensity, increased surface pore structure and increased DOP absorption, such that the results show that the internal porosity is increased, and the internal pore structure is increased.

Description

technical field [0001] The invention discloses a film remover and a polymerization method for increasing the porosity of polyvinyl chloride resin, belonging to the field of polymer polymerization. Background technique [0002] As one of the five major plastics, polyvinyl chloride resin has good processability and excellent mechanical and chemical properties, and has been widely used in construction, agriculture, chemical industry and daily life. Different from plastics such as polyethylene and polypropylene, the processing and formulation of polyvinyl chloride resin are more complicated. Before processing and preparing products, many additives including plasticizers, stabilizers, lubricants, reinforcing agents, etc. need to be mixed with resin powder Fully mixed, especially the absorption of liquid additives such as plasticizers and stabilizers is extremely critical, and the pore structure, size and distribution on the surface and inside of polyvinyl chloride resin particles...

AI Technical Summary

Problems solved by technology

The technical key of this process lies in the timing, dosage and method of adjusting the pH value of the polymerization water phase, which can easily affect the stability of the polymerization system

[0004] Patent CN 101717459B proposes the use of three types of polyvinyl alcohol composites with high degree of alcoholysis (78-95%), medium degree of alcoholysis (70-80%), and low degree of alcoholysis (40-60%) as dispersants. Each is 0.001-0.10% of the weight of vinyl chloride monomer, and it is prepared by adding polyvinyl alcohol with low alcoholysis degree in different conversion rate periods, but the effect of increasing the resin pore structure is not obvious, and the uniformity of the resin pore structure is not significantly improved. At the same time, it increases the difficulty of polymerization operation and reduces the quality stability of the product

[0005] Patent CN102453175B proposes to use a mixture of polyvinyl alcohol and hydroxypropyl methylcellulose as the main dispersant, and at the same time use a C4-C10 n-alkane functional additive as a porosity regulator. Although it has a certain effect, the internal structure of the resin particles is improved. Limited effect, limited reduction effect of the surface film in the resin particle structure that has an important influence on chlorination

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