Aqueous semi-permeable coating and method for its preparation

Abstract

The application belongs to the technical field of paint, and discloses a water-based semi-transparent paint and a preparation method thereof.The water-based semi-transparent paint 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 aid comprises alcohol ether compound, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate.The water-based semi-transparent paint has good semi-transparent coloring effect and is not prone to mold and discoloration in a high-humidity environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coatings, and particularly relates to a water-based semi-transparent coating and a preparation method thereof. BACKGROUND

[0002] The water-based semi-transparent coating is a coating product using water as a solvent or a dispersion medium, and is widely applied in the wood and furniture industries. The water-based semi-transparent coating is between a fully transparent varnish and a solid color paint, and can partially show the original texture and quality of wood after coating, and also gives the wood certain color and protection performance. The principle is that through special film-forming material and pigment formula design, the coating can form a protective film on the surface of the wood, and will not completely cover the natural texture of the wood, like covering a layer of gauze on the surface of the wood, which has a solid and simple modern beauty from a distance, and a natural beauty of wood texture when viewed closely, and truly realizes the "see wood, not paint" thin but not swollen, transparent but not muddy. The water-based semi-transparent coating has many advantages such as environmental protection, water resistance, durability, and convenient construction. According to the coating process, it includes spraying semi-transparent coating, brushing semi-transparent coating, and wiping semi-transparent coating. The traditional water-based semi-transparent coating has poor semi-transparent coloring effect, and cannot well show the hazy beauty of wood texture, and is prone to mildew and discoloration in a high-humidity environment.

[0003] Therefore, it is urgent to provide a water-based semi-transparent coating with good semi-transparent coloring effect, which is not prone to mildew and discoloration in a high-humidity environment. SUMMARY

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

[0005] The present application provides a water-based semi-transparent coating.

[0006] Specifically, a water-based semi-transparent 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.

[0007] The film-forming aid comprises an alcohol ether compound, propylene glycol phenyl ether, and dipropylene glycol methyl ether acetate.

[0008] In some embodiments of the present application, 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.

[0009] In some embodiments of the present application, 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.

[0010] In some embodiments of the present application, the water-based semi-permeable coating includes, by weight parts, 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.

[0011] In some embodiments of the present application, the water-based modified self-crosslinking acrylic resin is water-based modified self-crosslinking acrylic resin S7509 of Zhenxin New Material Co., Ltd.

[0012] In some embodiments of the present application, the antibacterial agent includes silver ion antibacterial agent and 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.

[0013] In some embodiments of the present application, the silver ion antibacterial agent is silver ion antibacterial agent DM830.

[0014] In some embodiments of the present application, the antibacterial and antiviral synergist is antibacterial and antiviral synergist SP-40.

[0015] In some embodiments of the present application, the water-based nano transparent color paste is at least one of B153-WS water-based nano transparent clear blue color paste, BK07-WS water-based nano transparent black color paste, R254-WS water-based nano transparent bright red color paste, W006-WS water-based nano transparent white color paste, and Y083-WS water-based nano transparent yellow color paste.

[0016] In some embodiments of the present application, the water-based semi-permeable coating further includes 0.05-0.3 parts of defoaming agent, 0.1-0.8 parts of wetting agent, and 0.3-1 parts of thickening agent; further preferably, the water-based semi-permeable coating further includes 0.1-0.2 parts of defoaming agent, 0.2-0.6 parts of wetting agent, and 0.5-1 parts of thickening agent.

[0017] In some embodiments of the present application, the defoaming agent includes at least one of BYK024, Tego 810, and Tego 822.

[0018] In some embodiments of the present application, the wetting agent includes at least one of BYK349, Tego 270, and Tego 4100.

[0019] In some embodiments of the present application, the thickening agent is an associative polyurethane thickening agent, such as one of Mingling PUR40, PUR44, Rongma Hasi RM-8W, RM-2050, and any combination thereof.

[0020] The present application also provides a preparation method of the water-based semi-transparent paint.

[0021] Specifically, the preparation method of the water-based semi-transparent paint comprises the following steps:

[0022] The components are mixed and dispersed to obtain the water-based semi-transparent paint.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] (1) The present application first uses a water-based modified self-crosslinking acrylic resin in combination with a water-based fluorocarbon resin. After the two resins are added in a certain proportion, they have good compatibility, strong mechanical stability, and can be mutually soluble with the water-based transparent color paste in any proportion and have excellent storage stability. The modified self-crosslinking acrylic resin used in the present application can form a network structure between the polymer chains during film formation, which can significantly improve the mechanical strength (especially the water-based modified self-crosslinking acrylic resin developed by Zhan Chen 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, such as poor mechanical stability, cold brittleness, and heat adhesion); in combination with an appropriate amount of water-based fluorocarbon resin, the coloring power and weather resistance of the paint can be significantly improved. Furthermore, it has been found that the use of alcohol ether compounds, propylene glycol phenyl ether, and dipropylene glycol methyl ether acetate as film-forming additives can effectively improve the film-forming quality of the water-based modified self-crosslinking acrylic resin and the water-based fluorocarbon resin, improve the compactness and uniformity of the coating, and exhibit more excellent coloring power and semi-transparent effect. The water-based nano transparent color paste used in the present application has fine particle size, good transparency, bright color, easy dispersion, good stability, and excellent fastness performance compared with dyes. The fine particle size of the color paste helps to improve the coloring intensity and color light performance of the color paste. The color paste has good transparency and bright color, which can provide a clear and beautiful appearance for the water-based nano semi-transparent color paste. The color paste has good stability, which ensures that the color and performance of the color paste do not change significantly during storage and use. The color paste has excellent fastness performance, which can provide more durable and stable color performance compared with dyes. In addition, the present application uses a silver ion antibacterial agent in combination with an antibacterial and antiviral synergistic agent, which can effectively prevent wood from mildewing, has high safety, good heat resistance, and chemical stability.

[0025] (2) The water-based semi-transparent paint provided by the present application has good semi-transparent coloring effect and is not prone to mildewing and discoloration in a high-humidity environment. DETAILED DESCRIPTION

[0026] In order to make the skilled in the art more clearly understand the technical solutions described in the present application, the following examples are listed for illustration. It should be pointed out that the following examples do not constitute a limitation on the scope of protection required by the present application.

[0027] The raw materials, reagents or devices in the following examples and comparative examples are commercially available or can be obtained by known methods unless otherwise specified.

[0028] Example 1

[0029] An aqueous semi-permeable coating, the components of which are shown in Table 1.

[0030] Table 1

[0031]

[0032] The preparation method of the above-mentioned aqueous semi-permeable coating includes the following steps: accurately weighing the above-mentioned components in a dispersed state in a dispersion tank and then adding them in sequence, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and filtering and packaging after detection is qualified.

[0033] Example 2

[0034] An aqueous semi-permeable coating, the components of which are shown in Table 2.

[0035] Table 2

[0036]

[0037] The preparation method of the above-mentioned aqueous semi-permeable coating includes the following steps: accurately weighing the above-mentioned components in a dispersed state in a dispersion tank and then adding them in sequence, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and filtering and packaging after detection is qualified.

[0038] Example 3

[0039] An aqueous semi-permeable coating, the components of which are shown in Table 3.

[0040] Table 3

[0041]

[0042] The preparation method of the above-mentioned aqueous semi-permeable coating includes the following steps: accurately weighing the above-mentioned components in a dispersed state in a dispersion tank and then adding them in sequence, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and filtering and packaging after detection is qualified.

[0043] Comparative Example 1

[0044] An aqueous coating, the components of which are shown in Table 4.

[0045] Table 4

[0046]

[0047] The preparation method of the above-mentioned aqueous coating comprises the following steps: accurately weighing the above-mentioned components in a dispersed state in a dispersion tank, then adding them in sequence, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and after the detection is qualified, filtering and packaging.

[0048] Comparative Example 2

[0049] An aqueous semi-transparent coating, the components of which are shown in Table 5.

[0050] Table 5

[0051]

[0052] The preparation method of the above-mentioned aqueous semi-transparent coating comprises the following steps: accurately weighing the above-mentioned components in a dispersed state in a dispersion tank, then adding them in sequence, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and after the detection is qualified, filtering and packaging.

[0053] Comparative Example 3

[0054] An aqueous semi-transparent coating, the components of which are shown in Table 6.

[0055] Table 6

[0056]

[0057] The preparation method of the above-mentioned aqueous semi-transparent coating comprises the following steps: accurately weighing the above-mentioned components in a dispersed state in a dispersion tank, then adding them in sequence, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and after the detection is qualified, filtering and packaging.

[0058] Comparative Example 4

[0059] An aqueous semi-transparent coating, the components of which are shown in Table 7.

[0060] Table 7

[0061]

[0062] The preparation method of the water-based semi-permeable coating comprises the following steps: accurately weighing the above components in a dispersion tank, adding them in sequence under dispersion state, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and filtering and packaging after detection.

[0063] Comparative Example 5

[0064] A water-based coating, the components of which are shown in Table 8.

[0065] Table 8

[0066]

[0067] The preparation method of the water-based coating comprises the following steps: accurately weighing the above components in a dispersion tank, adding them in sequence under dispersion state, continuously stirring, controlling the rotation speed at 2000 r / min, uniformly dispersing, the fineness being less than 20 μm, the coating film being free of shrinkage holes, and filtering and packaging after detection.

[0068] Performance detection

[0069] The coating method of the water-based semi-permeable coating is as follows:

[0070] (1) Preparing the water-based semi-permeable coating, clean cloth and test plate, and the test plate is cherry wood veneer.

[0071] (2) Test plate treatment: polishing with a sander to remove surface burrs and stains.

[0072] (3) Taking the coating and pouring it on the clean cloth, spirally rubbing with a clean cloth to guide the water-based semi-permeable coating into the wood fiber conduit.

[0073] The water-based coatings prepared in the examples and comparative examples are coated by the above method (the amount of coating is kept consistent), and dried at room temperature for 2 hours. Then, the woodware primer is coated on the cherry wood veneer, polished, and then the woodware topcoat is continuously coated. The coating amount of the woodware primer and the woodware topcoat is 80 g / m 2 .

[0074] After accelerated drying at 50℃ for 24 hours, the film appearance and gloss, mildew resistance and weather resistance are tested, and the test results are shown in Tables 9 and 10. The weather resistance is determined according to GB / T 23987, the mildew resistance is tested according to HG / T3950-2007 antibacterial coating, and the film appearance and gloss are determined and evaluated according to GB / T23999.

[0075] Table 9

[0076]

[0077] Note: The semi-transparent coloring effect, coloring power and transparency are divided into 5 grades, grade 1 to grade 5 from good to bad.

[0078] Table 10

[0079]

[0080] From Tables 9 and 10, it can be seen that the water-based semi-transparent coating prepared in the embodiment of the present application has good semi-transparent coloring effect, excellent mildew resistance and weather resistance. The difference between Comparative Example 1 and Example 1 is that the water-based acrylic resin is used to replace the water-based modified self-crosslinking acrylic resin, and the semi-transparent coloring effect and weather resistance of the water-based coating prepared in Comparative Example 1 are obviously inferior to those of Example 1. Comparative Example 2 is prepared by using only the water-based modified self-crosslinking acrylic resin without the water-based fluorocarbon resin, and the other components are the same as those in Example 1. It is tested that the coloring power and weather resistance of the coating in Comparative Example 2 are obviously inferior to those of Example 1.

[0081] From Comparative Example 1 and Comparative Examples 3 and 4, it can be seen that when only two film-forming assistants among the alcohol ether compound, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate are used, even if the total amount of the film-forming assistants is the same, the semi-transparent coloring effect, coloring power and weather resistance will be affected to different degrees. From Comparative Example 1 and Comparative Example 5, it can be seen that when the water-based nano color paste is used, it performs poorly in the semi-transparent coloring effect and weather resistance.

[0082] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An aqueous semi-permeable coating, characterized in that, The water-based semi-permeable paint comprises, by weight parts, 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 aid comprises an alcohol ether compound, propylene glycol phenyl ether and dipropylene glycol methyl ether acetate.

2. The aqueous, semi-permeable coating of claim 1, wherein, 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 aqueous, semi-permeable coating according to claim 1 or 2, characterized in that, The alcohol ether compound comprises at least one of dipropylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol butyl ether and diethylene glycol butyl ether.

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

5. The aqueous, semi-permeable coating of claim 1 or 2, wherein, The water-based modified self-crosslinking acrylic resin is a water-based modified self-crosslinking acrylic resin S7509.

6. The aqueous, semi-permeable coating of claim 1 or 2, wherein, The antibacterial agent comprises a silver ion antibacterial agent and an antibacterial and antiviral synergist.

7. The aqueous, semi-permeable coating of claim 6, wherein, The silver ion antibacterial agent is a silver ion antibacterial agent DM830, and the antibacterial and antiviral synergist is an antibacterial and antiviral synergist SP-40.

8. The aqueous, semi-permeable coating of claim 1 or 2, wherein, The water-based semi-permeable paint further comprises 0.05-0.3 parts of a defoaming agent, 0.1-0.8 parts of a wetting agent and 0.3-1 parts of a thickening agent.

9. The aqueous, semi-permeable coating of claim 8, wherein, The thickening agent is an associated polyurethane thickening agent.

10. A process for the preparation of the aqueous semi-permeable coating according to any one of claims 1 to 9, characterized in that, The method comprises the steps of mixing and dispersing the components to obtain the water-based semi-permeable paint.

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