Polyurethane orange-peel coating

Abstract

The invention relates to a polyurethane orange-peel coating, which comprises a component A and a component B, wherein the component A is a diisocyanate prepolymer; the component B consists of the following components in percentage: 30-50 percent of base resin, 5-25 percent of pigment, 10-20 percent of filler, 20-30 percent of composition for adjusting the flowing property of the coating and the balance of solvent; the polyurethane orange-peel coating is prepared by uniformly mixing the component A with the component B in the weight ratio of 1:(3-6); the base resin is one or two of saturated polyester resin with the non-volatile matter content of more than or equal to 65 percent (weight) or hydroxyl acrylic resin; the composition for adjusting the flowing property of the coating consists of hydroxyl acrylic resin or saturated polyester resin which has the non-volatile matter content of more than or equal to 60 percent (weight) and contains symmetrical diurea groups, an orange-peel aid and a solvent; and the using amount of the orange-peel aid is 1-3 percent of the weight of the hydroxyl acrylic resin or the saturated polyester resin which contains symmetrical diurea groups. The coating disclosed by the invention has a good orange-peel effect, high glossiness, water resistance, oil resistance, cutting fluid resistance and high stain resistance.

Description

technical field [0001] The invention relates to a polyurethane orange-grain paint, which is especially suitable for high-performance topcoat on the surface of steel structures such as machine tools, plastic beds, instruments and meters, medical equipment, motors, electric tools, or aluminum alloys. Background technique [0002] Orange pattern paint can form a unique orange-shaped effect, elegant and generous, strong decoration, excellent weather resistance, tough coating film, good impact resistance, abrasion resistance, chemical resistance and water resistance, and it is resistant to rough The surface of the substrate has a certain covering effect, and is widely used as a high-performance topcoat on the surface of steel structures such as machine tools, plastic beds, instruments, medical equipment, motors, and electric tools, or aluminum alloys. Due to the strong concave-convex appearance and prominent patterns of the orange pattern coating, it is generally required that th...

AI Technical Summary

Problems solved by technology

However, the addition of thixotropic additives such as organic bentonite or fumed silica significantly increases the viscosity of the coating. Therefore, a large amount of solvent needs to be added to meet the requirements of construction and manufacturing. As a result, the construction solid content of the coating is reduced. When the film is formed, the shrinkage rate of the paint film is large after the solvent evaporates, and the effect of the orange pattern is reduced. In addition, organic bentonite and fumed silica have a certain degree of matting, which reduces the gloss of the paint film and affects the appearance of the orange pattern paint.

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