Preparation method of large-grain size latex particles

Abstract

The invention relates to a preparation method of latex particles with grain sizes from 500nm to 1000nm. Agglomerating agent is copolymer of alkyl acrylate and carboxyl monomer, wherein the weight percentage of the carboxyl monomer is 3-60%, and the weight percentage of the alkyl acrylate is 97-40%; mixed emulsifying agent is fatty acid soap and alkane sulfonate, ferrous sulfate, rongalit, ethylenediaminetetraacetic acid tetrasodium salt and sodium hydrogensulfite are reducing agent, the reaction temperature is 75 DEG C, a first section of initiating agent is water-soluble initiating agent, a second section of initiating agent is oil-soluble initiating agent, and the average grain diameters are adjusted by cross-linking agent from 50 to 250nm to obtain the agglomerating agent; and the large-grain size latex comprises the components based on the parts by weight: 100 parts of the primary latex, 0.5-4 parts of the agglomerating agent, and 0.05-0.8 part of KOH solution under the agglomerating temperature of 20-80 DEG C. The method is used for preparing the large-grain size latex of synthetic resin, so that the low-temperature shock resistance of the resin can be improved, and the processed large-grain size latex can be used for producing the high-grade automobile lamp.

Description

Technical field: [0001] The invention relates to a method for preparing latex particles with a particle diameter of 500nm to 1000nm. Background technique: [0002] The particle size of latex polymer particles prepared by conventional methods is usually less than 150nm, which we call primary latex. The latex with this particle size cannot meet the application requirements in many aspects. For example, the particle size of the grafted trunk latex used in the preparation of ABS is required to be between 250 and 450nm. Therefore, it is necessary to use an agglomeration method to change the small particle size into a large particle size latex. . [0003] There are many methods for preparing large particle size latex, including freezing agglomeration, chemical agglomeration, pressure agglomeration, and polymer latex agglomeration. [0004] The agglomeration particle size of the freezing agglomeration method is uncontrollable and consumes a lot of energy. [0005] It is difficul...

AI Technical Summary

Problems solved by technology

Two problems need to be solved. One is to solve the related problems of the special agglomerating agent used in the preparation of super-large particle size latex, including the stability of the agglomerating agent synthesis reaction, so as to achieve the purpose of stable reaction, easy control of heat release, and less gel separation. At the same time, solve the problems of agglomerating agent particle size control, molecular weight control, low conversion rate of agglomerating agent synthesis, molecular structure control, etc., solve agglomeration problems, including agglomeration effect and agglomeration speed, and seek ways to increase agglomeration rate , but also to solve the problem of particle size and viscosity control of large particle size latex, to solve the stability of agglomerated latex to storage time, temperature, monomer, pH, to solve the mixing stability, heat resistance stability, and stability of large particle size latex The problem of alkali resistance stability, the second is to solve the problems of agglomerated latex graft stability and its application in ABS manufacturing