High-performance waterborne double-component polyurethane metal paint composition and application thereof

Abstract

The invention discloses a high-performance waterborne double-component polyurethane metal paint composition which comprises a component A and a component B, wherein the component A to the component Bis 1:0.1-1: 0.5. The component A comprises, in weight percent, 30-70% of waterborne hydroxyl acrylic resin. The component B comprises, in weight percent, 40-80% of isocyanate curing agents, 10-30 parts of polycarbodiimide, preferably, according to the total weight of the component B, the component B further comprises trimethylchlorosilane, and the weight percent of the trimethylchlorosilane is lager than 0% and smaller than or equal to 5%. A film formed by the paint has the advantages of high hardness and gloss, good plumpness and low VOCs (volatile organic compounds). The film has excellent corrosion resistance, warm water resistance and water boiling resistance. The invention further provides an application of the metal paint composition.

Description

technical field [0001] The invention belongs to the technical field of water-based paint preparation methods, and specifically discloses a high-performance water-based two-component polyurethane metal paint composition and an application thereof. Background technique [0002] As a functional material, paint occupies a very important position in the national economy. The relatively authoritative book "Painting Technology" in the Chinese coatings industry defines it as follows: "Painting is a material that can be coated on the surface of an object by different construction techniques to form a firm adhesion, a certain strength, and a continuous coating. Solid film. The film formed in this way is commonly called a coating film, also known as a paint film or a coating." Coatings can provide protection and decoration for substrates (metal, wood, etc.). In recent years, the coatings industry, especially the Chinese coatings industry, has developed very rapidly. The World Federat...

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Problems solved by technology

But on the one hand, even under alkaline conditions, the polycarbodiimide crosslinking agent and the hydroxyacrylic resin will react slowly during the storage process, especially the pH of the hydroxypropyl resin will generally decrease during the storage process, which will further accelerate its reaction. On the other hand, the pH of the system is high after the two components are mixed, and the reaction of carbodiimide is slow, so it is impossible to achieve rapid crosslinking in the film forming process

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