Method for preparing water-soluble solid styrene/acrylic resin and application thereof

Abstract

The invention discloses a method for preparing water-soluble solid styrene / acrylic resin and application thereof. The method prepares the required resin by simultaneously performing free radical polymerization reaction and esterification reaction on an aromatic vinyl unsaturated monomer, an aliphatic vinyl unsaturated monomer, an unsaturated carboxylic acid monomer, fat alkanol, an initiating agent and an alpha-methyl styrene dimer in a reactor. In the method, the alpha-methyl styrene dimer is added as a chain transfer agent to reduce the branching degree and avoid the generation of gel and the blockage of the reactor; and simultaneously, the added fat alkanol performs esterification reaction with acroleic acid to inhibit the esterification reaction between an alcohol ether solvent and the acroleic acid, thus the viscosity of the reaction mixture is controlled effectively, and the finally prepared resin has narrow molecular weight distribution (Mw / Mn is less than 2.0), low molecular weight (Mw is less than 10,000), few organic volatile matters, and good wetting dispersion of pigment, and can be applied to preparing water color ink, coating or oil polish.

Description

technical field [0001] The invention relates to the field of polymer polymerization, in particular to a preparation method and application of a water-soluble solid styrene / acrylic resin. Background technique [0002] Styrene / acrylic resin (referred to as styrene-acrylic resin) is a copolymer based on vinyl monomers such as styrene, α-methylstyrene, acrylic acid, acrylate, acrylamide, and methyl methacrylate. A class of water-soluble polymers. [0003] Styrene / acrylic resin has excellent adhesion, film-forming, dispersibility, thickening and flocculation properties, and is widely used in the fields of ink, paint, papermaking, textile, food, medicine, cosmetics and water treatment. [0004] Usually, the synthesis method of styrene / acrylic resin is to prepare styrene / acrylic ester copolymer solution by solution polymerization of styrene monomer and acrylic monomer in the presence of organic solvent, and then directly supply ink in the form of solution , Paint manufacturers, m...

AI Technical Summary

Problems solved by technology

However, the shortcomings of this technology are: the organic solvents used are generally flammable and toxic, which brings a burden to storage and transportation; VOC emissions are high and pollute the environment; Reasonable other types of solvents, so that the good solubility of acrylic resins in various solvents has not been fully utilized

But water content in mixed solvent is lower than 20% (weight) dipropylene glycol methyl ether and acrylic acid generation esterification, reduces the acid value of final product; If water content is higher than 45% (weight), moisture will evaporate in a large amount, just The viscosity of the reaction mixture cannot be effectively controlled, and the internal pressure of the reactor will increase a lot, which is unsafe