Emulsion of sunlight irradiation crosslinking hud polymer, preparation method and application

Abstract

This invention relates to an acrylate copolymer, more specifically, a sunlight radiation-crosslinked polymer emulsion, its preparation method and its application. The polymer emulsion is composed of: water 50-70 wt.%, emulsifier 0.5-5.0 wt.%,, initiator 0.2-1.0 wt.%, alkyl acrylate 3-40 wt.%, alkyl methacrylate 3-40 wt.%, hydroxyalkyl (meth)acrylate 1.0-10 wt.%, alkyl acrylic acid 0.5-10 wt.%, other acrylate functional monomers 0.5-10 wt.%,, and self-crosslinking monomer 0.5-5.0 wt.%. The self-crosslinked core-shell emulsion is composed of cores with a higher glass transition temperature, and shells with a lower glass transition temperature. The emulsion has such advantages as low film-forming temperature, low film-forming aid consumption, and high hardness of the film, and is environmentally friendly.

Description

technical field [0001] The invention relates to an acrylate copolymer, in particular to a solar radiation crosslinked core-shell polymer emulsion and its preparation method and application. Background technique [0002] Compared with traditional solvent-based coatings, acrylic water-based coatings use water as the dispersion medium, so they have the advantages of saving resources and energy, not polluting the environment, non-toxic, non-flammable, and low cost, and can be widely used in construction, metal, etc. and wood surface coating. The homogeneous polymers obtained by ordinary emulsion polymers are contradictory in the hardness of the coating film and the film-forming temperature. To obtain a high-hardness coating film, a polymer with a high glass transition temperature is required, and it is necessary to increase the film-forming temperature when forming a film. The amount of additives will increase the VOC of water-based coatings, which is not conducive to environme...

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Problems solved by technology

U.S. Patent No. 7,091,278 (2006.8.15) uses water-based hydroxyacrylic resin and isocyanate crosslinking agent to prepare two-component water-based coatings, but the two-component coatings have short pot life, need to be configured on site, and the preparation ratio is not easy to be accurate.

US4772680 adopts room temperature cross-linked emulsion of acetoacetate group and hydrazide, but there is a shortcoming of high toxicity of raw materials

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