Synthesis process of acid liquor thickening agent on basis of control of PH value of reaction system

Abstract

The invention discloses a synthesis process of an acid liquor thickening agent on the basis of control of the PH value of a reaction system. The synthesis process comprises the steps of: a, purifying a reaction monomer; b, preparing an initiating agent solution; c, weighing a defined amount of 2-methyl-2-acrylamide propanesulfonic acid solid, and dissolving the solid; d, adding and fully dissolving crylic acid and dimethyl diallyl ammonium chloride; e, regulating the PH value of the solution to be 6-8; f, transferring the mixed solution into a container, exhausting oxygen and stirring; g, adding the initiating agent solution; and h, heating a reaction system for carrying out a polymerization reaction at the temperature controlled to be 40-50 DEG C to obtain a target product. The synthesis process is capable of successfully synthesizing the acid liquor thickening agent, and has the advantages of simple steps, simplicity in operation, short synthesis time, high synthesis efficiency and low synthesis cost; various performance parameters of the synthesized acid liquor thickening agent are superior to those of the existing acid liquor thickening agent; and through controlling the temperature of the reaction system, the transformation rate and the intrinsic viscosity of the target product are increased.

Description

technical field [0001] The invention relates to a synthesis process of an acid liquid thickener based on controlling the pH value of a reaction system. Background technique [0002] Thickener is a kind of rheological additive, which can not only thicken the coating and prevent sagging during construction, but also endow the coating with excellent mechanical properties and storage stability. It is a very important class of additives for water-based paints with low viscosity. [0003] At present, there are many kinds of thickeners available in the market, mainly including inorganic thickeners, celluloses, polyacrylates and associative polyurethane thickeners. Cellulosic thickeners have a long history of use and there are many varieties, including methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, etc., which used to be the mainstream of thickeners. The most commonly used of these is hydroxyethyl cellulose. Polyacrylate thicken...

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Problems solved by technology

[0023] In the synthesis process of acid thickener, as the reaction temperature increases, the decomposition rate of the initiator increases, the number of free radicals generated in the reaction system increases, the polymerization rate accelerates, the conversion rate of the monomer increases, and the reaction reaches After a certain temperature, the conversion rate of the monomer does not change much, but if the reaction temperature is too high, the number of free radicals generated will increase, which will lead to a decrease in the degree of polymerization and a decrease in the molecular weight of the product

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