Primer-topcoat acrylic resin coating and preparation method thereof

Abstract

The invention discloses a primer-topcoat acrylic resin coating. The primer-topcoat acrylic resin coating comprises a component A and a component B in a weight ratio of (5-7):1, wherein the component Acomprises the components in parts by weight: 50-70 parts of acrylic resin, 2-4 parts of a dispersing agent, 1-2 parts of a dispersing aid, 20-40 parts of a pigment filler, 0.1-4 parts of other aids and 5-15 parts of a solvent; the component B comprises the components in parts by weight: 65-75 parts of hexamethylene diisocyanate, 25-35 parts of butyl acetate and 0.1-0.5 part of a water absorbent.According to the coating, glycidyl tertiary carbonate modified acrylic resin with specific solid content, viscosity, hydroxyl value and molecular weight of 1600-2000 is used as matrix resin, and hexamethylene diisocyanate and an antirust pigment are matched, so that weather resistance, appearance requirements, hardness, flexibility and the like are met, and low VOC is realized. Meanwhile, one spraying procedure can be omitted in the construction process of the primer-topcoat coating, and no special requirement is needed for construction equipment.

Description

technical field [0001] The invention relates to the technical field of coatings. More specifically, it relates to an acrylic resin coating with integrated bottom and surface and a preparation method thereof. Background technique [0002] The construction machinery industry is the foundation of the development of the national economy. In recent years, with the country's continuous investment in infrastructure, the construction machinery industry has also developed by leaps and bounds. Coating operation is an important part of construction machinery production. At present, two coating systems of anti-corrosion primer and polyurethane topcoat are generally used for matching. This matching method has long construction lines, large workshop area, and many construction workers. Disadvantages. In addition, with the country's emphasis on the environment and the introduction of various environmental protection regulations, it is increasingly difficult for traditional solvent-based c...

AI Technical Summary

Problems solved by technology

Coating operation is an important part of construction machinery production. At present, two coating systems of anti-corrosion primer and polyurethane topcoat are generally used for matching. This matching method has long construction lines, large workshop area, and many construction workers. Disadvantages. In addition, with the country's emphasis on the environment and the introduction of various environmental protection regulations, it is increasingly difficult for traditional solvent-based coatings to meet customer requirements because of the large amount of volatile organic compounds emitted during the construction process. Require

[0003] At present, the traditional solvent-based coatings used in the surface coating of construction machinery generally have a solid content of less than 60%. During construction, it is necessary to add a diluent with a weight ratio of 20-40% organic solvents to assist the construction, resulting in the VOC produced during construction> 600g / L , even if the VOCs emitted after activated carbon adsorption treatment, it is difficult to meet the emission requirements stipulated by the government

[0004] In order to reduce VOC emissions from coatings, the general technical solution is to use water-based coatings, but the customer's existing equipment needs to be modified, because water vapor volatilizes during the construction process, and the coating equipment must be made of stainless steel and water-based coatings are harmful to the construction environment. High humidity requirements require customers to invest in equipment transformation, and the initial capital investment is relatively large, which is unbearable for ordinary customers

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