Water-based high-filler coatings and their preparation methods

Abstract

This invention discloses a water-based high-filler coating, comprising: 100-150 parts of mixed emulsion, 130-200 parts of filler, 1-4 parts of defoamer, 2-5 parts of dispersant, 1-4 parts of leveling agent, 1.5-4 parts of thixotropic agent, 1-4 parts of curing agent, and 2-5 parts of thickener. By using a blend of waterborne polyurethane emulsion and waterborne acrylic emulsion, the elasticity of polyurethane causes the waterborne paint layer to be subjected to a force opposite to the shrinkage direction during curing, effectively preventing shrinkage. Combined with fillers including hollow glass microspheres and bentonite, the hollow glass microspheres form a three-dimensional rigid skeleton within the waterborne paint layer. When the paint layer shrinks, it is physically supported by the spheres, thus reducing the shrinkage rate. Furthermore, the spherical structure of the hollow glass microspheres disperses and buffers the internal stress of the paint layer, preventing stress concentration and volume deformation, further reducing the shrinkage rate. Finally, the bentonite absorbs water and expands, enlarging the paint layer and preventing water penetration, thereby extending the service life of the MDF.

Description

Technical Field

[0001] This invention relates to the field of coatings, and in particular to a water-based high-filler coating and its preparation method. Background Technology

[0002] With the rapid development of my country's social economy, consumers have increasingly higher demands for quality of life. In home decoration and furniture purchases, the demand for high-end solid wood furniture has significantly increased compared to panel or engineered wood furniture. Water-based paint is a polymer material that uses water instead of the organic solvents in traditional oil-based paints as the dispersion medium. It has advantages such as being non-toxic, pollution-free, low-odor, non-flammable, and non-explosive.

[0003] Previously, water-based paints on the market had limited functions, primarily improving the feel and smoothness of the coating film through water-based polymers, but lacking excellent filling properties on MDF (medium-density fiberboard). To address this, some manufacturers developed water-based paints with superior filling properties. However, while initially completely filling the MDF, these paints undergo slight shrinkage after curing, creating tiny gaps between the paint layer and the MDF. These gaps allow water to easily seep in, shortening the lifespan of the MDF. Therefore, it is necessary to improve existing high-filling water-based paints. Summary of the Invention

[0004] In view of this, the present invention addresses the deficiencies of the prior art, and its main objective is to provide a water-based high-filler coating and its preparation method, which can effectively solve the problem that existing water-based paints with filling properties are prone to shrinkage after curing, resulting in tiny gaps between the water-based paint layer and the MDF, which are easily penetrated by water, thus shortening the service life of the MDF.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A water-based high-filler coating, comprising the following main components by weight: The mixture comprises 100-150 parts of a mixed emulsion, 130-200 parts of a filler, 1-4 parts of a defoamer, 2-5 parts of a dispersant, 1-4 parts of a leveling agent, 1.5-4 parts of a thixotropic agent, 1-4 parts of a curing agent, and 2-5 parts of a thickener; wherein the mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of the aqueous polyurethane emulsion to the aqueous acrylic emulsion of 1:(1-1.5); the filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 20-40 parts of bentonite, 10-30 parts of talc, and a mass ratio of hollow glass microspheres to barium sulfate of (2-4):1.

[0006] As a preferred embodiment, the defoamer is one of BYK024, BYK028, TEGO825, or TEGO902W.

[0007] As a preferred embodiment, the dispersant is of the type BYK-190.

[0008] As a preferred embodiment, the leveling agent is either BYK-333 or BYK-358.

[0009] As a preferred embodiment, the thixotropic agent is a polyamide wax.

[0010] As a preferred embodiment, the curing agent is a polyamide curing agent.

[0011] As a preferred embodiment, the thickener is Coapur XS83.

[0012] A method for preparing the aforementioned waterborne high-filler coating includes the following steps: adding waterborne polyurethane emulsion and waterborne acrylic emulsion into a reaction vessel, stirring at 100 r / min for 30 min, then adding the remaining components, and continuing to stir for 30 min.

[0013] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution: By using a blend of waterborne polyurethane emulsion and waterborne acrylic emulsion, the elasticity of polyurethane causes the waterborne paint layer to be subjected to a force opposite to the shrinkage direction during curing, effectively preventing shrinkage. Combined with fillers including hollow glass microspheres and bentonite, the hollow glass microspheres form a three-dimensional rigid skeleton within the waterborne paint layer. When the paint layer shrinks, it is physically supported by the spheres, thus reducing the shrinkage rate. Furthermore, the spherical structure of the hollow glass microspheres disperses and buffers the internal stress of the paint layer, preventing volume deformation caused by stress concentration, further reducing the shrinkage rate. Finally, the bentonite absorbs water and expands, enlarging the paint layer and filling the gap between the paint layer and the MDF board, preventing water penetration and extending the service life of the MDF board.

[0014] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to several specific embodiments. Detailed Implementation

[0015] This invention discloses a water-based high-filler coating, which, by weight, comprises the following main components: The mixture comprises 100-150 parts of a mixed emulsion, 130-200 parts of a filler, 1-4 parts of a defoamer, 2-5 parts of a dispersant, 1-4 parts of a leveling agent, 1.5-4 parts of a thixotropic agent, 1-4 parts of a curing agent, and 2-5 parts of a thickener; wherein the mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of the aqueous polyurethane emulsion to the aqueous acrylic emulsion of 1:(1-1.5); the filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, wherein the bentonite comprises 20-40 parts; The ingredients include 10-30 parts talc powder, and hollow glass microspheres and barium sulfate in a mass ratio of (2-4):1. Specifically, the defoamer is one of BYK024, BYK028, TEGO825, or TEGO902W; the dispersant is BYK-190; the leveling agent is one of BYK-333 or BYK-358; the thixotropic agent is polyamide wax; the curing agent is a polyamide curing agent; and the thickener is Coapur XS83. The specific preparation method includes the following steps: adding waterborne polyurethane emulsion and waterborne acrylic emulsion into a reaction vessel, stirring at 100 r / min for 30 min, then adding the remaining ingredients, and continuing to stir for another 30 min.

[0016] The following detailed description is based on several specific embodiments.

[0017] Example 1 The mixture comprises 100 parts of a mixed emulsion, 150 parts of a filler, 2 parts of a defoamer, 3 parts of a dispersant, 1 part of a leveling agent, 4 parts of a thixotropic agent, 3 parts of a curing agent, and 2 parts of a thickener; wherein the mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of 1:1.2. The filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 20 parts of bentonite, 20 parts of talc, and a mass ratio of 2:1 between the hollow glass microspheres and barium sulfate.

[0018] Example 2 The mixture comprises 150 parts of a mixed emulsion, 200 parts of a filler, 3 parts of a defoamer, 3 parts of a dispersant, 4 parts of a leveling agent, 3 parts of a thixotropic agent, 3 parts of a curing agent, and 5 parts of a thickener. The mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of 1:1. The filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 30 parts of bentonite, 30 parts of talc, and a mass ratio of 3:1 between the hollow glass microspheres and barium sulfate.

[0019] Example 3 The mixture comprises 120 parts of a mixed emulsion, 130 parts of a filler, 1 part of a defoamer, 2 parts of a dispersant, 2 parts of a leveling agent, 3 parts of a thixotropic agent, 11 parts of a curing agent, and 3 parts of a thickener. The mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of 1:1.5. The filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 40 parts of bentonite, 15 parts of talc, and a mass ratio of 4:1 between the hollow glass microspheres and barium sulfate.

[0020] Example 4 The mixture comprises 150 parts of a mixed emulsion, 180 parts of a filler, 4 parts of a defoamer, 3 parts of a dispersant, 3 parts of a leveling agent, 3 parts of a thixotropic agent, 3 parts of a curing agent, and 3 parts of a thickener. The mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of 1:1.3. The filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 25 parts of bentonite, 20 parts of talc, and a mass ratio of 3:1 between the hollow glass microspheres and barium sulfate.

[0021] Example 5 The mixture comprises 130 parts of a mixed emulsion, 150 parts of a filler, 4 parts of a defoamer, 5 parts of a dispersant, 2 parts of a leveling agent, 1.5 parts of a thixotropic agent, 1 part of a curing agent, and 3 parts of a thickener. The mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of 1:1.1. The filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 30 parts of bentonite, 20 parts of talc, and a mass ratio of 2.5:1 between the hollow glass microspheres and barium sulfate.

[0022] Example 6 The mixture comprises 135 parts of a mixed emulsion, 175 parts of a filler, 2 parts of a defoamer, 3 parts of a dispersant, 2 parts of a leveling agent, 2 parts of a thixotropic agent, 4 parts of a curing agent, and 3 parts of a thickener. The mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of 1:1.2. The filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 30 parts of bentonite, 10 parts of talc, and a mass ratio of 3:1 between the hollow glass microspheres and barium sulfate.

[0023] Performance tests were conducted on the above-mentioned multiple embodiments, and the test results are shown in Table 1.

[0024]

[0025] Table 1 The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A water-based high-filler coating, characterized in that: By weight, it includes the following main components: The mixture comprises 100-150 parts of a mixed emulsion, 130-200 parts of a filler, 1-4 parts of a defoamer, 2-5 parts of a dispersant, 1-4 parts of a leveling agent, 1.5-4 parts of a thixotropic agent, 1-4 parts of a curing agent, and 2-5 parts of a thickener; wherein the mixed emulsion is composed of an aqueous polyurethane emulsion and an aqueous acrylic emulsion, with a mass ratio of the aqueous polyurethane emulsion to the aqueous acrylic emulsion of 1:(1-1.5); the filler is composed of hollow glass microspheres, bentonite, barium sulfate, and talc, with 20-40 parts of bentonite, 10-30 parts of talc, and a mass ratio of hollow glass microspheres to barium sulfate of (2-4):

1.

2. The water-based high-filler coating according to claim 1, characterized in that: The defoamer is one of the following: BYK024, BYK028, TEGO825, or TEGO902W.

3. The water-based high-filler coating according to claim 1, characterized in that: The dispersant is of model number BYK-190.

4. The water-based high-filler coating according to claim 1, characterized in that: The leveling agent is either BYK-333 or BYK-358.

5. The water-based high-filler coating according to claim 1, characterized in that: The thixotropic agent is a polyamide wax.

6. The water-based high-filler coating according to claim 1, characterized in that: The curing agent is a polyamide curing agent.

7. The water-based high-filler coating according to claim 1, characterized in that: The thickener is Coapur XS83.

8. A method for preparing a water-based high-filler coating as described in any one of claims 1-7, characterized in that: The process includes the following steps: adding waterborne polyurethane emulsion and waterborne acrylic emulsion into a reaction vessel, stirring at 100 r / min for 30 min, then adding the remaining components and continuing to stir for 30 min.

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