Aqueous bi-component acrylic acid-polyurethane resin and preparation method thereof

Abstract

The invention relates to an aqueous bi-component acrylic acid-polyurethane resin and a preparation method thereof. The aqueous bi-component acrylic acid-polyurethane resin comprises a component A and a component B, wherein the component A comprises n-butyl alcohol, monoethanolamine and / or n-butyl amine, hydroquinone and / or p-hydroxyanisole, glycidyl methacrylate, methyl methacrylate and / or isobornyl methacrylate, butyl acrylate and / or butyl methacrylate and / or acrylic acid laurate, hydroxyethyl acrylate, azodiisobutyronitrile, butylcellosolve and / or propylene glycol monomethyl ether, a molecular weight regulator, dimethylformamide, an acid neutralizer and water; the component B comprises butanone and / or ethyl acetate, propylene glycol methyl ether acetate, monoethanolamine and / or n-butylamine, cis-hexahydrophthalic acid glycidyl ester and / or tetrahydrophthalic acid glycidyl ester, IPDI (Isophorone Diisocyanate) and / or HDI (Hexamethylene Diisocyanate), ethylene glycol monobutyl ether and / or ethylene glycol, the acid neutralizer and the water; and the weight ratio of the component A to the component B is (4-7):1. A coating prepared from the aqueous bi-component acrylic acid-polyurethane resin is more than 150 microns in thickness and cannot generate bubbles or pinholes.

Description

technical field [0001] The invention relates to a water-based two-component acrylic-polyurethane resin, which can be cured at normal temperature. The invention also relates to a method for preparing the resin. Background technique [0002] The two-component polyurethane system has excellent mechanical properties (high film hardness, strong adhesion, high wear resistance, etc.), good chemical resistance, weather resistance and low-temperature film-forming properties, and is widely used in industrial protection, wood furniture and Automobile painting and so on. With the improvement of environmental protection regulations in various countries and the enhancement of people's awareness of environmental protection, the emission of volatile organic compounds (VOC) in traditional solvent-based two-component polyurethane is subject to more and more strict restrictions. The water-based two-component polyurethane coating is a product that combines the high-performance coating of solv...

AI Technical Summary

Problems solved by technology

[0003] Although the water-based two-component polyurethane system has many advantages, because the curing agent used contains isocyanate groups, some defects are also obvious, which also seriously limit its application, such as: short pot life, mixed isocyanate and Hydroxyl and water will also react at room temperature, which will make the system invalid, lose the crosslinking ability of the coating film, and affect the performance

In addition, during the curing process of isocyanate, it is also relatively easy to react with water, producing gas CO 2 , if the thickness of the coating film is large, the CO produced during the drying and curing process 2 If it cannot be discharged smoothly or is discharged slowly, bubbles or pinholes will be formed on the coating film, which will seriously affect the performance and appearance

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