Self-thickening acrylic emulsion with core-shell structure and excellent water whitening resistance, and preparation method of self-thickening acrylic emulsion

Abstract

The invention discloses a self-thickening acrylic emulsion with a core-shell structure and excellent water whitening resistance, and a preparation method of the self-thickening acrylic emulsion. The self-thickening acrylic emulsion is prepared from the following raw materials in parts by mass: 100 to 200 parts of distilled water, 10 to 20 parts of alkyl methacrylate, 20 to 40 parts of acrylic hydrophilic monomer, 40 to 60 parts of alkyl acrylate, 3 to 5 parts of methacrylic hydrophobic monomer, 1 to 4 parts of a reactive anionic emulsifier, 0.5 to 1.0 part of a crosslinking monomer and 0.1 to 1.0 part of an initiator. The preparation method comprises the following steps: preparing a pre-emulsion A; preparing a pre-emulsion B; preparing a seed emulsion; dropwise adding the pre-emulsion A; and dropwise adding the pre-emulsion B. The emulsion does not influence the water-resistant and water-white-resistant effects of an original paint film in the use process of a colorful continuous phase, a finishing varnish and a real stone paint, has an obvious thickening effect, is more advantageous in cost compared with a polyurethane thickening agent, and is more advantageous in the aspects of thickening efficiency and water whitening resistance compared with a conventional self-thickening acrylic emulsion, so the self-thickening acrylic emulsion has very high practical value.

Description

technical field [0001] The invention specifically relates to the field of coatings, in particular to a self-thickening acrylic emulsion with a core-shell structure and excellent water whitening resistance and a preparation method thereof. Background technique [0002] With the rapid development of science and technology and the improvement of people's living standards, people's requirements and tastes for coatings are also improving. People are no longer satisfied with the paint for interior and exterior walls of buildings that can only provide coverage. Functional coatings are gradually favored by customers, such as colorful paints, imitation marble real stone paints, art paints and finish varnishes. The emergence of this situation is closely related to the use of self-thickening acrylic emulsion, and considering the selection of price, thickening efficiency and high thixotropy, this kind of thickener is essential. Therefore, how to develop a kind of water whitening excelle...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of science and technology and the improvement of people's living standards, people's requirements and tastes for coatings are also improving. People are no longer satisfied with the paint for interior and exterior walls of buildings that can only provide coverage. Functional coatings are gradually favored by customers, such as colorful paints, imitation marble real stone paints, art paints and finish varnishes. The emergence of this situation is closely related to the use of self-thickening acrylic emulsion, and considering the selection of price, thickening efficiency and high thixotropy, this kind of thickener is essential. Therefore, how to develop a kind of water whitening excellent, thickening Efficient self-thickening acrylic emulsion is a technical problem in this industry, which deserves to be solved and improved as soon as possible

[0003] At present, since the self-thickening acrylic emulsion uses more hydrophilic monomers, and the carboxyl group is too hydrophilic after neutralization, it is easy to locally aggregate and distribute during the drying process of the paint film, and when the paint film encounters water again During the wet process, water molecules are easily absorbed inside the paint film, resulting in a decrease in the refractive index, which is visually shown as whitening of the paint film. However, if other common hydrophobic monomers such as styrene and methyl methacrylate are used, due to their hard When the monomer structure plays a role in self-thickening, it will limit the stretching of molecular chains, resulting in low thickening efficiency