Smell-free styrene-acrylic emulsion and clean-smell coating with emulsion as film forming matter

Abstract

The invention provides a preparation method of a styrene-acrylic emulsion with VOC lower than 100 ppm and a coating containing the emulsion. The VOC of the final emulsion coating can be controlled to be lower than 100 ppm. The emulsion has excellent color contrast properties, mechanical stability and water resistance, alkali resistance and scrubbing resistance of a paint film, and is suitable for being used as a building coating emulsion.

Description

technical field [0001] The invention relates to a deodorizing styrene-acrylic emulsion and a deodorizing paint using the emulsion as a film-forming substance. Background technique [0002] Latex paint has entered the Chinese home improvement market for more than 30 years. It can be said that in the minds of ordinary Chinese consumers, latex paint is a synonym for "building wall paint". At present, due to the increasing attention to environmental protection issues, paint manufacturers in Europe, America, and Japan have successively launched low-VOC or even zero-VOC latex paints, and the film-forming materials used have developed from early vinyl acetate series to acrylate copolymer emulsion series with better water resistance. , this is because the residual monomer vinyl acetate in the emulsion of vinegar-acrylic paint has high hydrophilicity, which is not only extremely difficult to eliminate chemically, but also difficult to remove even by distillation. Therefore, the odor ...

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Problems solved by technology

[0003] The present inventor has carried out in-depth research for the purpose of solving the problems of high residual monomer content and large pungent odor in the styrene-acrylic copolymer emulsion used in domestic architectural coatings, thereby further improving the competitiveness of domestic coating emulsions, and found that Through: (1) selection of specific monomers and cross-linking monomers; (2) strict control of impurities in the raw materials used in emulsion polymerization, such as the impurity content of monomers, such as xylene and ethylbenzene content in styrene; (3) Using reactive emulsifiers for emulsion polymerization to synthesize styrene-acrylic emulsions, reducing the odor brought by conventional small molecule non-reactive emulsifiers; (4) After the emulsion is added dropwise and polymerized, an odorless initiator before and after decomposition is used as a post-elimination process (5) After the emulsion is synthesized, high-temperature nitrogen and falling film evaporation technology are used to extract and distill the residual monomer and other organic impurities in the monomer raw material; the VOC of the final emulsion can be controlled at less than 100ppm Within, architectural coating emulsion with excellent color development, mechanical stability, paint film water resistance, alkali resistance and scrub resistance

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