Water-based Low VOC high-metal texture two-component polyurethane low-temperature curing coating and preparation method thereof

Abstract

The invention discloses a water-based Low VOC high-metal texture two-component polyurethane low-temperature curing coating and a preparation method thereof. The coating comprises a main agent A and a curing agent B, the main agent A comprises the following components: 25 to 40 parts of waterborne polyurethane (PU) and acrylic dispersion resin, 0.1 to 0.3 part of a pH regulator, 2 to 5 parts of a waterborne coalescing agent, 0.3 to 1 part of a waterborne wetting agent, 0.2 to 1.0 part of a waterborne flatting agent, 20 to 40 parts of a self-made waterborne silver bar additive, 4 to 12 parts of self-made silver soaking water, 4 to 6 parts of waterborne aluminum silver paste, 0 to 6 parts of pearl powder, 0 to 10 parts of waterborne color paste, 0 to 5 parts of a functional additive, 1 to 5 parts of a thickening thixotropic agent, and 6.5 to 15 parts of deionized water; and the curing agent B comprises the following components in parts by weight: 70-80 parts of a water-based isocyanate curing agent and 20-30 parts of a curing agent diluent; and the method is characterized by mixing the main agent A and the curing agent B into the mixed structure and uniformly stirring. The invention provides the preparation method of a water-based Low VOC high-metal texture two-component polyurethane low-temperature curing coating. The good balance between the high-metal texture appearance and excellent physical and chemical resistance of a two-component polyurethane coating film under the water-based Low VOC condition is realized.

Description

technical field [0001] The present invention relates to the technical field of low-temperature curing of water-based two-component polyurethane, in particular to a water-based Low VOC high metal texture two-component polyurethane (2K PU) low-temperature curing coating and a preparation method thereof. Background technique [0002] Waterborne two-component polyurethane low-temperature curing coatings have been widely used in many fields due to their convenient construction, short curing cycle, low energy consumption and outstanding performance. Metallic paint (silver paint) is widely used in many fields such as automobiles, 3C, home appliances and craft decorations because it can provide excellent metallic texture and has the effect of changing colors with the viewing angle. The published CN101260269A patent mentions that a low-VOC water-based silver powder baking paint needs to be baked at 130°C for 30 minutes to obtain a relatively ideal surface effect and physical properti...

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Problems solved by technology

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a method for preparing a water-based Low VOC high metallic texture two-component polyurethane low-temperature curing coating, which not only solves the high energy consumption when the water-based metallic texture coating (silver paint) is dried and cured In order to solve the problem of coating, the two-component polyurethane (Water-borne 2K PU) coating film has a good balance between high metallic appearance and excellent physical and chemical resistance under the condition of water-based Low VOC

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