A kind of highly gloss-retaining and color-retaining acrylic acid modified polyurethane topcoat and preparation method thereof

Abstract

The invention belongs to the field of coating and particularly relates to a high light-retaining and color-retaining acrylic acid modified polyurethane finishing coat and a preparation method thereof.The finishing coat contains a component A and a component B in a weight ratio of 100 to (20-30), wherein the component A contains the following raw materials in parts by weight: 40-50 parts of an acrylate emulsion, 50-60 parts of a polyurethane emulsion, 3-6 parts of an enhancer, 10-15 parts of pigments and fillers, 1-3 parts of a dispersing agent, 0.5-1 part of a defoaming agent, 0-5 parts of other aids and the balance of deionized water; and the component B is a water-based curing agent. The adopted enhancer contains a benzophenone structure with an excellent light stabilization effect andis cable of strongly absorbing ultraviolet light, so that the damage caused by the ultraviolet light to the finishing coat is avoided; and meanwhile, the enhancer has no possibility of being decomposed and decolorized, further contains an N-cyclohexyl p-methoxyaniline structure and has good ozone aging performance, radiation aging resistance and normal aging resistance, and the structure is not decolorized after being placed in air and sunlight for a long time, so that the finishing coat with high light-retaining and color-retaining properties is obtained.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to an acrylic modified polyurethane topcoat with high gloss and color retention and a preparation method thereof. Background technique [0002] Polyurethane coatings have good flexibility, impact resistance, corrosion resistance, abrasion resistance, and the appearance of the coating film is good, and it has good decorative properties. Combining it with acrylic ester can give it good adhesion at the same time and weather resistance. [0003] In order to further improve the anti-aging performance and corrosion resistance of polyurethane coatings, additives such as enhancers, anti-aging agents, and antioxidants are generally added to the coating system, but these additives are generally small molecular compounds, which are not suitable for miscibility or fixation. In the system, and generally do not contain active groups that can chemically react with the polyurethane system, so that there is...

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Problems solved by technology

[0003] In order to further improve the anti-aging performance and corrosion resistance of polyurethane coatings, additives such as enhancers, anti-aging agents, and antioxidants are generally added to the coating system, but these additives are generally small molecular compounds, which are not suitable for miscibility or fixation. In the system, and generally does not contain active groups that can chemically react with the polyurethane system, so that these additives lack chemical bonding with the system, and are easy to separate out of the system, causing adverse effects on the coating

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