Preparation method of styrene-acrylic emulsion and water-based paint

Abstract

The invention discloses a preparation method of a styrene-acrylic emulsion, which comprises the following steps: preparing a hard core from the following raw materials in parts by weight: 140-180 parts of a hard monomer and 2-6 parts of acrylic acid, preparing a soft shell, wherein the soft shell comprises the following raw materials in parts by weight: 70-90 parts of a hard monomer and 30-50 parts of butyl acrylate, and preparing an outer-layer soft shell, wherein the outer-layer soft shell comprises the following raw materials in parts by weight: 30-50 parts of a hard monomer, 70-90 parts ofbutyl acrylate, 2-7 parts of methyl methacrylate and 4-8 parts of diacetone acrylamide and the hard monomer is composed of styrene and methyl methacrylate in a mass ratio of (10-180): (0-160). The invention also discloses water-based paint which comprises the following components in parts by weight: 93-96 parts of the styrene-acrylic emulsion, 0.1-0.8 part of a film forming aid, 0.1-0.3 part of adefoaming agent and 0.1-0.7 part of a leveling agent. The mass part of the film forming aid added into the water-based paint is 0.8% or below, so that the water-based paint is excellent in environmental protection property and high in drying speed and the water-based paint is high in hardness after being dried.

Description

technical field [0001] The invention relates to the field of water-based paint, in particular to a preparation method of a styrene-acrylic emulsion and a water-based paint. Background technique [0002] In order to make the coating have higher hardness at room temperature, it is necessary to ensure that it is in a glassy state at room temperature, and the glass transition temperature of the coating should be appropriately higher than room temperature; in order to make the coating form a film quickly, the minimum film-forming temperature needs to be appropriately lower than room temperature , otherwise the paint will produce whitening, cracking, and even powder in severe cases. The method of obtaining acrylic paint with hard core and soft shell particles by seed emulsion polymerization can obtain styrene-acrylic emulsion with higher glass transition temperature and lower minimum film forming temperature, which is a hot research direction of water-based paint at present. [0...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is: the styrene-acrylic emulsion with hard core and soft shell obtained by the seed emulsion polymerization method needs to add a large amount of film-forming aids when preparing the coating in the later stage, resulting in slow drying speed of the coating and low VOC content in the coating. high problem

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