Self-cleaned high-weather resistance aqueous acrylic polyurethane top coating and preparation method

Abstract

The invention discloses a self-cleaned high-weather resistance aqueous acrylic polyurethane top coating and a preparation method. The top coating is a double-component aqueous acrylic polyurethane coating which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 40-60 parts of an aqueous hydroxyl acrylic dispersion, 10-20 parts of a pigment filler, 5-20 parts of graphite-phase carbon nitride, 10-20 parts of an aqueous polyaniline emulsion, 1-3 parts of an organic silicon leveling agent, 1-2 parts of a defoaming agent, 4-8 parts of filming aids, 1-2 parts of a neutralizer, 1-3 parts of a dispersing agent, 3-6 parts of an alkali dissolution type thickening agent and 5-13 parts of deionized water; the component B comprises 10-30 parts of aliphatic isocyanate and 4-10 parts of propylene carbonate. The self-cleaned high-weather resistance aqueous acrylic polyurethane top coating disclosed by the invention can be dried by self, can be also dried with heat at 80 DEG C and is rich in coating film, high in hardness and good in chemical resistance; due to introduction of the graphite-phase carbon nitride into the aqueous coating, the self cleaning property of the coating film can be improved, a great amount of labor and materials are saved, and meanwhile the wearing resistance and the thermal stability of the self-cleaned high-weather resistance aqueous acrylic polyurethane top coating are improved.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a self-cleaning highly weather-resistant water-based acrylic polyurethane topcoat and a preparation method thereof. Background technique [0002] In recent years, the problem of PM2.5 has become increasingly serious, the concentration of organic pollutants in the air has continued to increase, and the problem of environmental pollution has continued to be severe, making people pay more and more attention to environmental protection. The country has issued the latest policy, and "oil to water" is imminent. Water-based coatings not only need to meet the protection of the substrate, but also play a decorative role on the substrate. [0003] At present, in the field of water-based coatings for modified cars in China, due to the influence of the environment in which the modified cars are used, such as wind, sun, rain, etc., their water-based coatings have always had insuf...

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of water-based coatings for modified cars in China, due to the influence of the environment in which the modified cars are used, such as wind, sun, rain, etc., their water-based coatings have always had insufficient weather resistance, and there are also many defects in clear image and anti-rust performance; and During the use of modified cars, they are vulnerable to ultraviolet light and corrosion by pollutants in the air, which limit the development of the overall industry of modified cars in my country