Water-based semi-permeable coating and preparation method thereof

Abstract

The invention belongs to the technical field of coatings, and discloses a water-based semi-permeable coating and a preparation method thereof. The water-based semi-permeable coating is prepared from the following components in parts by weight: 40 to 55 parts of water-based modified self-crosslinking acrylic resin, 10 to 20 parts of water-based fluorocarbon resin, 15 to 30 parts of deionized water, 2 to 12 parts of coalescing agent, 0.5 to 2 parts of antibacterial agent and 3 to 8 parts of water-based nano transparent color paste, the film-forming agent comprises an alcohol ether compound, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate. The water-based semi-permeable coating provided by the invention has a good semi-permeable coloring effect, and is not easy to mildew and discolor in a high-humidity environment.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based semi-permeable coating and a preparation method thereof. Background Art

[0002] Water-based semi-permeable coating is a coating product that uses water as a solvent or dispersion medium. It is widely used in wood products, furniture and other industries. Water-based semi-permeable coating is between fully transparent varnish and solid color paint. After coating, it can partially reveal the original texture and texture of the wood, while giving the wood a certain color and protective properties. The principle is that through the special film-forming substance and pigment formula design, the coating can form a protective film on the surface of the wood without completely covering the natural texture of the wood, just like covering the surface of the wood with a layer of gauze. From a distance, it has the simple and modern beauty of solid color, and from a close distance, it has the natural beauty of wood texture, truly realizing the "see wood but not paint" thin but not swollen, transparent but not muddy. Water-based semi-permeable coating has many advantages such as environmental protection, water resistance and durability, and convenient construction. It is classified according to the coating process, including spray semi-permeable coating, brush semi-permeable coating and wipe semi-permeable coating. Traditional water-based semi-permeable coating has poor semi-permeable coloring effect, cannot well show the hazy beauty of wood texture, and is prone to mold and discoloration in a high humidity environment.

[0003] Therefore, there is an urgent need to provide a water-based semi-permeable coating with good semi-permeable coloring effect and which is not prone to mold and discoloration in a high-humidity environment. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a water-based semi-permeable coating and a preparation method thereof. The water-based semi-permeable coating provided by the present invention has a good semi-permeable coloring effect and is not prone to mold and discoloration in a high-humidity environment.

[0005] The invention provides a water-based semi-permeable coating.

[0006] Specifically, a water-based semi-permeable coating comprises, by weight: 40-55 parts of a water-based modified self-crosslinking acrylic resin, 10-20 parts of a water-based fluorocarbon resin, 15-30 parts of deionized water, 2-12 parts of a film-forming aid, 0.5-2 parts of an antibacterial agent, and 3-8 parts of a water-based nano transparent color paste; The film-forming agent includes alcohol ether compounds, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate.

[0007] In some embodiments of the present invention, the mass ratio of the alcohol ether compound to the propylene glycol phenyl ether and the dipropylene glycol methyl ether acetate is (3-7): (1-2): 1; preferably, the mass ratio of the alcohol ether compound to the propylene glycol phenyl ether and the dipropylene glycol methyl ether acetate is (3-5): (1-2): 1.

[0008] In some embodiments of the present invention, the alcohol ether compound includes at least one of dipropylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol butyl ether, and diethylene glycol butyl ether.

[0009] In some embodiments of the present invention, the water-based semi-permeable coating comprises, by weight: 45-50 parts of water-based modified self-cross-linking acrylic resin, 15-20 parts of water-based fluorocarbon resin, 20-25 parts of deionized water, 4-10 parts of film-forming aid, 0.5-1.5 parts of antibacterial agent and 5-7 parts of water-based nano transparent color paste.

[0010] In some embodiments of the present invention, the water-based modified self-cross-linking acrylic resin is the water-based modified self-cross-linking acrylic resin S7509 produced by Zhanchen New Materials Co., Ltd.

[0011] In some embodiments of the present invention, the antibacterial agent includes a silver ion antibacterial agent and an antibacterial and antiviral synergist. Preferably, the mass ratio of the silver ion antibacterial agent to the antibacterial and antiviral synergist is (0.5-1):1.

[0012] In some embodiments of the present invention, the silver ion antibacterial agent is silver ion antibacterial agent DM830.

[0013] In some embodiments of the present invention, the antibacterial and antiviral enhancer is the antibacterial and antiviral enhancer SP-40.

[0014] In some embodiments of the present invention, the aqueous nano transparent color paste is at least one of B153-WS aqueous nano transparent clear blue paste, BK07-WS aqueous nano transparent black paste, R254-WS aqueous nano transparent bright red paste, W006-WS aqueous nano transparent white paste, and Y083-WS aqueous nano transparent yellow paste.

[0015] In some embodiments of the present invention, the water-based semi-permeable coating further includes 0.05-0.3 parts of a defoamer, 0.1-0.8 parts of a wetting agent, and 0.3-1 parts of a thickener; further preferably, the water-based semi-permeable coating further includes 0.1-0.2 parts of a defoamer, 0.2-0.6 parts of a wetting agent, and 0.5-1 parts of a thickener.

[0016] In some embodiments of the present invention, the defoaming agent includes at least one of BYK024, Tego 810, and Tego 822.

[0017] In some embodiments of the present invention, the wetting agent includes at least one of BYK349, Tego270, and Tego4100.

[0018] In some embodiments of the present invention, the thickener is an associative polyurethane thickener, such as Mingling PUR40, PUR44, Rohm and Haas RM-8W, RM-2050, Hemmings Deqian 299, or any combination thereof.

[0019] The invention also provides a method for preparing the water-based semi-permeable coating.

[0020] Specifically, a method for preparing a water-based semi-permeable coating comprises the following steps: The components are mixed and dispersed to prepare a water-based semi-permeable coating.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention first selects a water-based modified self-crosslinking acrylic resin and a water-based fluorocarbon resin for use. After the two resins are added in a certain proportion, they have good compatibility and strong mechanical stability. They can be miscible with water-based transparent color paste in any proportion and have excellent storage stability. The modified self-crosslinking acrylic resin used in the present invention can crosslink the polymer chains to form a network structure when forming a film, which can significantly improve the mechanical strength (especially the water-based modified self-crosslinking acrylic resin developed by Zhanchen Company, which uses a large number of crosslinking groups or crosslinking systems. When the acrylic resin is dried to form a film, a polymer with a network structure is generated through the reaction between the crosslinking groups, thereby changing the characteristics of the acrylic resin being hot-sticky and cold-brittle and having poor mechanical stability); with an appropriate amount of water-based fluorocarbon resin, the tinting power and weather resistance of the coating can be significantly improved. Furthermore, the study found that the use of alcohol ether compounds, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate as film-forming aids can effectively improve the film-forming quality of water-based modified self-crosslinking acrylic resin and water-based fluorocarbon resin, improve the density and uniformity of the coating, and present a more excellent tinting power and translucent effect. The water-based nano transparent color paste selected by the present invention has fine particle size, good transparency, bright color, easy dispersion, good stability, and excellent fastness performance compared with dyes. The color paste has fine particle size, and this fine particle size helps to improve the tinting strength and color light performance of the color paste. The color paste has good transparency and bright color, which can enable the water-based nano semi-transparent color paste to provide a clear and bright appearance for the product. The color paste has good stability, ensuring that its color and performance will not change significantly during storage and use. The color paste has excellent fastness performance and can provide a more durable and stable color performance compared with dyes. In addition, the present invention adopts a silver ion antibacterial agent compounded with an antibacterial and antiviral synergist, and the two synergistically enhance the effect, which can effectively prevent wood from getting moldy, and has the advantages of high safety, good heat resistance, and chemical stability.

[0022] (2) The water-based semi-permeable coating provided by the present invention has a good semi-permeable coloring effect and is not prone to mold and discoloration in a high-humidity environment. DETAILED DESCRIPTION

[0023] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0024] Unless otherwise specified, the raw materials, reagents or devices in the following examples and comparative examples can be obtained from conventional commercial sources or by existing known methods.

[0025] Example 1 A water-based semi-permeable coating, the components of which are shown in Table 1.

[0026] Table 1 The preparation method of the above-mentioned water-based semi-permeable coating comprises the following steps: in a dispersion tank, the above-mentioned components are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and after passing the inspection, it is filtered and packaged.

[0027] Example 2 A water-based semi-permeable coating, the components of which are shown in Table 2.

[0028] Table 2 The preparation method of the above-mentioned water-based semi-permeable coating comprises the following steps: in a dispersion tank, the above-mentioned components are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and after passing the inspection, it is filtered and packaged.

[0029] Example 3 A water-based semi-permeable coating, the components of which are shown in Table 3.

[0030] Table 3 The preparation method of the above-mentioned water-based semi-permeable coating comprises the following steps: in a dispersion tank, the above-mentioned components are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and after passing the inspection, it is filtered and packaged.

[0031] Comparative Example 1 A water-based paint, the components of which are shown in Table 4.

[0032] Table 4 The preparation method of the above-mentioned water-based paint includes the following steps: in a dispersion tank, the above-mentioned components are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and filtering and packaging are performed after passing the inspection.

[0033] Comparative Example 2 A water-based semi-permeable coating, the components of which are shown in Table 5.

[0034] Table 5 The preparation method of the above-mentioned water-based semi-permeable coating comprises the following steps: in a dispersion tank, the above-mentioned components are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and after passing the inspection, it is filtered and packaged.

[0035] Comparative Example 3 A water-based semi-permeable coating, the components of which are shown in Table 6.

[0036] Table 6 The preparation method of the above-mentioned water-based semi-permeable coating comprises the following steps: in a dispersion tank, the above-mentioned components are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and after passing the inspection, it is filtered and packaged.

[0037] Comparative Example 4 A water-based semi-permeable coating, the components of which are shown in Table 7.

[0038] Table 7 The preparation method of the above-mentioned water-based semi-permeable coating comprises the following steps: in a dispersion tank, the above-mentioned components are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and after passing the inspection, it is filtered and packaged.

[0039] Comparative Example 5 A water-based paint, the components of which are shown in Table 8.

[0040] Table 8 The preparation method of the above-mentioned water-based paint includes the following steps: in a dispersion tank, the above-mentioned materials are accurately weighed in a dispersed state and added in sequence, stirring continuously, the rotation speed is controlled at 2000r / min, the dispersion is uniform, the fineness is less than 20μm, the coating film has no shrinkage holes, and filtering and packaging are performed after passing the inspection.

[0041] Performance Testing The coating method of water-based semi-permeable coating is as follows: (1) Prepare water-based semi-permeable coating, cleaning cloth and test board. The test board is cherry wood veneer.

[0042] (2) Test board processing: Use a grinder to remove burrs and stains on the surface.

[0043] (3) Pour the paint onto a clean cloth and use the clean cloth to rub it in a spiral shape to allow the water-based semi-permeable paint to enter the wood fiber ducts.

[0044] The above method was used to apply the water-based coatings prepared in the embodiment and the comparative example (the amount of coating was kept the same), and then dried at room temperature for 2 hours. Then, a wood clear primer was applied on the cherry wood veneer, and after polishing, a wood clear topcoat was applied. The coating amount of the wood clear primer and the wood clear topcoat was 80 g / m 2 .

[0045] After accelerated drying at 50℃ for 24h, the paint film appearance and gloss, mildew resistance and weather resistance were tested. The test results are shown in Tables 9 and 10. The weather resistance was tested in accordance with GB / T 23987, the mildew resistance was tested in accordance with HG / T3950-2007 antibacterial coatings, and the paint film appearance and gloss were tested and evaluated in accordance with GB / T23999.

[0046] Table 9 Note: The semi-transparent coloring effect, tinting strength and transparency are divided into 5 levels, from level 1 to level 5 from good to bad.

[0047] Table 10 It can be seen from Tables 9 and 10 that the water-based semi-permeable coating prepared in the embodiment of the present invention has good semi-permeable coloring effect, excellent mildew resistance and weather resistance. The difference between Comparative Example 1 and Example 1 is that water-based acrylic resin is used to replace water-based modified self-crosslinking acrylic resin. The semi-permeable coloring effect and weather resistance of the water-based coating prepared in Comparative Example 1 are obviously inferior to those in Example 1. Comparative Example 2 is to use only water-based modified self-crosslinking acrylic resin without water-based fluorocarbon resin, and the other components are the same as Example 1. After testing, the tinting power and weather resistance of the coating in Comparative Example 2 are obviously inferior to those in Example 1.

[0048] Comparing Example 1 with Comparative Examples 3 and 4, it can be seen that when only two film-forming agents of alcohol ether compounds, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate are used, even if the total amount of the film-forming agent is the same, the semi-transparent coloring effect, tinting power and weather resistance will be affected to varying degrees. Comparing Example 1 with Comparative Example 5, it can be seen that when water-based nano-color paste is used, it performs poorly in both semi-transparent coloring effect and weather resistance.

[0049] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A water-based semi-permeable coating, characterized in that: The composition comprises, by weight: 40-55 parts of water-based modified self-crosslinking acrylic resin, 10-20 parts of water-based fluorocarbon resin, 15-30 parts of deionized water, 2-12 parts of film-forming aid, 0.5-2 parts of antibacterial agent and 3-8 parts of water-based nano transparent color paste; The film-forming agent includes alcohol ether compounds, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate.

2. The water-based semi-permeable coating according to claim 1, characterized in that: The mass ratio of the alcohol ether compound to the propylene glycol phenyl ether and the dipropylene glycol methyl ether acetate is (3-7):(1-2):

1.

3. The water-based semi-permeable coating according to claim 1 or 2, characterized in that: The alcohol ether compound includes at least one of dipropylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol butyl ether and diethylene glycol butyl ether.

4. The water-based semi-permeable coating according to claim 1 or 2, characterized in that: The water-based semi-permeable coating comprises, by weight: 45-50 parts of water-based modified self-crosslinking acrylic resin, 15-20 parts of water-based fluorocarbon resin, 20-25 parts of deionized water, 4-10 parts of film-forming aid, 0.5-1.5 parts of antibacterial agent and 5-7 parts of water-based nano transparent color paste.

5. The water-based semi-permeable coating according to claim 1 or 2, characterized in that: The water-based modified self-cross-linking acrylic resin is water-based modified self-cross-linking acrylic resin S7509.

6. The water-based semi-permeable coating according to claim 1 or 2, characterized in that: The antibacterial agent includes a silver ion antibacterial agent and an antibacterial and antiviral synergist.

7. The water-based semi-permeable coating according to claim 6, characterized in that: The silver ion antibacterial agent is silver ion antibacterial agent DM830; the antibacterial and antiviral synergist is antibacterial and antiviral synergist SP-40.

8. The water-based semi-permeable coating according to claim 1 or 2, characterized in that: The water-based semi-permeable coating also includes 0.05-0.3 parts of a defoamer, 0.1-0.8 parts of a wetting agent and 0.3-1 parts of a thickener.

9. The water-based semi-permeable coating according to claim 8, characterized in that: The thickener is an associative polyurethane thickener.

10. The method for preparing the water-based semi-permeable coating according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing and dispersing the components to prepare a water-based semi-permeable coating.

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