A water-based varnish, a method for preparing the same, and an application thereof

Abstract

The application discloses a kind of water-based varnish and its preparation method and application, the water-based varnish includes the following mass fraction components: water-based acrylic resin 35~50 parts, amino resin 10~20 parts, matte powder 1~3 parts, water-based non-ionic dispersant 0.5~2 parts, polyether modified silicone leveling agent 0.1~1 part, auxiliary 10~25 parts, water 10~30 parts;The number average molecular weight of the water-based acrylic resin is 1500~3500g / mol;The hydroxyl value of the water-based acrylic resin is 80~110mgKOH / g;The matte powder is selected from un-surface treated silicon dioxide.The water-based acrylic resin of specific molecular weight and hydroxyl value is used in the application, combined with amino resin, and un-surface treated silicon dioxide matte powder is dispersed using non-ionic dispersant, polyether modified silicone leveling agent is added, a kind of high permeability water-based varnish is obtained, the problem of its release, white, not permeable is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of industrial coatings, and particularly relates to a water-based varnish as well as a preparation method and application thereof. BACKGROUND

[0002] The overcoat varnish used in the industry of home security doors and iron doors is generally in a semi-matt state, and the gloss at an angle of 60° is between 30 and 50 GU. Such a semi-matt state does not produce strong light reflection and does not produce serious light pollution under strong light irradiation, which helps to relieve visual fatigue. With the strengthening of environmental protection trend and the consideration of production safety, the semi-matt overcoat varnish for iron doors (including the overcoat varnish for security door copper base wire drawing) has gradually transformed to water-based. However, in the use process of the water-based semi-matt overcoat varnish, it is found that the water-based semi-matt varnish is not as good as the solvent-based varnish in terms of permeability, which causes the appearance of the coating film to be slightly hazy, and further affects the heat transfer printing pattern effect. SUMMARY

[0003] In order to overcome at least one problem existing in the prior art, one of the purposes of the present application is to provide a water-based varnish which can obtain a permeability effect comparable to that of a solvent-based varnish.

[0004] The second purpose of the present application is to provide a preparation method of the above-mentioned water-based varnish.

[0005] The third purpose of the present application is to provide an application of the above-mentioned water-based varnish.

[0006] In order to achieve the above-mentioned purposes, the technical solution adopted by the present application is as follows:

[0007] The first aspect of the present application provides a water-based varnish, which comprises the following components in mass fraction: 35-50 parts of water-based acrylic resin, 10-20 parts of amino resin, 1-3 parts of matt powder, 0.5-2 parts of water-based non-ionic dispersant, 0.1-1 part of polyether modified silicone leveling agent, 10-25 parts of auxiliary agent, and 10-30 parts of water.

[0008] The number average molecular weight of the water-based acrylic resin is 1500-3500 g / mol; the hydroxyl value of the water-based acrylic resin is 80-110 mgKOH / g; and the matt powder is selected from un-surface treated silicon dioxide.

[0009] Preferably, the water-based varnish comprises the following components in mass fraction: 38-48 parts of water-based acrylic resin, 11-18 parts of amino resin, 1.2-2.8 parts of matt powder, 0.8-1.8 parts of water-based non-ionic dispersant, 0.2-0.8 parts of polyether modified silicone leveling agent, 12-22 parts of auxiliary agent, and 12-28 parts of water.

[0010] Further preferably, the water-based varnish comprises the following mass fractions of components: water-based acrylic resin 40-45 parts, amino resin 12-16 parts, matte powder 1.5-2.5 parts, water-based non-ionic dispersant 1-1.5 parts, polyether-modified silicone leveling agent 0.3-0.5 parts, auxiliary agent 15-20 parts, and water 15-25 parts.

[0011] Preferably, the number average molecular weight of the water-based acrylic resin is 1800-3200 g / mol; further preferably 2000-3000 g / mol.

[0012] Preferably, the hydroxyl value of the water-based acrylic resin is 85-105 mgKOH / g; further preferably 90-100 mgKOH / g.

[0013] In some embodiments of the present application, the water-based acrylic resin comprises at least one of R1385, R1389, or R1393.

[0014] Preferably, the amino resin is selected from partially methyl etherified amino resin; the etherification degree of the partially methyl etherified amino resin is 40-60%; further preferably 45-55%.

[0015] In some embodiments of the present application, the partially methyl etherified amino resin comprises at least one of Zannan cytec 325, Ineos Resimene 717, or Mikasa SM5717.

[0016] Preferably, the matte powder is selected from un-surface-treated precipitated silica.

[0017] In some embodiments of the present application, the matte powder comprises at least one of De Gussa OK412, De Gussa OK500, Hongsheng 230L, or Hongsheng 560N.

[0018] Preferably, the water-based non-ionic dispersant comprises polyethylene glycol type polyol, polyethyleneimine compound, or a combination thereof.

[0019] In some embodiments of the present application, the water-based non-ionic dispersant comprises at least one of Shentu SN-1729, Longhai LH-120, or Dow CF-10.

[0020] Preferably, the polyether-modified silicone leveling agent comprises ethylene oxide polyether-modified silicone, propylene oxide polyether-modified silicone, or a combination thereof.

[0021] In some embodiments of the present application, the polyether-modified silicone leveling agent comprises at least one of Shentu SN-4341, BYK333, or Glide 432.

[0022] Preferably, the auxiliary agent comprises at least one of an amine neutralizer, a film-forming co-solvent, a wetting agent, an antifoaming agent or an adhesion promoter; further preferably, the auxiliary agent comprises an amine neutralizer, a film-forming co-solvent, a wetting agent, an antifoaming agent and an adhesion promoter.

[0023] Preferably, the auxiliary agent comprises, in mass parts: 1-3 parts of an amine neutralizer, 10-20 parts of a film-forming co-solvent, 0.1-1 part of a wetting agent, 0.1-1 part of an antifoaming agent and 0.1-1.5 parts of an adhesion promoter.

[0024] Further preferably, the auxiliary agent comprises, in mass parts: 1.5-2.8 parts of an amine neutralizer, 12-18 parts of a film-forming co-solvent, 0.2-0.7 part of a wetting agent, 0.2-0.7 part of an antifoaming agent and 0.3-1.2 parts of an adhesion promoter.

[0025] More preferably, the auxiliary agent comprises, in mass parts: 2-2.5 parts of an amine neutralizer, 13-17 parts of a film-forming co-solvent, 0.3-0.5 part of a wetting agent, 0.3-0.5 part of an antifoaming agent and 0.5-1 part of an adhesion promoter.

[0026] Preferably, the water-based varnish comprises the following components in mass parts: 35-50 parts of a water-based acrylic resin, 10-20 parts of an amino resin, 1-3 parts of a matte powder, 0.5-2 parts of a water-based non-ionic dispersant, 0.1-1 part of a polyether-modified silicone leveling agent, 1-3 parts of an amine neutralizer, 10-20 parts of a film-forming co-solvent, 0.1-1 part of a wetting agent, 0.1-1 part of an antifoaming agent, 0.1-1.5 parts of an adhesion promoter and 10-30 parts of water.

[0027] Further preferably, the water-based varnish comprises the following components in mass parts: 38-48 parts of a water-based acrylic resin, 11-18 parts of an amino resin, 1.2-2.8 parts of a matte powder, 0.8-1.8 parts of a water-based non-ionic dispersant, 0.2-0.8 part of a polyether-modified silicone leveling agent, 1.5-2.8 parts of an amine neutralizer, 12-18 parts of a film-forming co-solvent, 0.2-0.7 part of a wetting agent, 0.2-0.7 part of an antifoaming agent and 0.3-1.2 parts of an adhesion promoter, and 12-28 parts of water.

[0028] More preferably, the water-based varnish comprises the following components in mass parts: 40-45 parts of a water-based acrylic resin, 12-16 parts of an amino resin, 1.5-2.5 parts of a matte powder, 1-1.5 parts of a water-based non-ionic dispersant, 0.3-0.5 part of a polyether-modified silicone leveling agent, 2-2.5 parts of an amine neutralizer, 13-17 parts of a film-forming co-solvent, 0.3-0.5 part of a wetting agent, 0.3-0.5 part of an antifoaming agent and 0.5-1 part of an adhesion promoter, and 15-25 parts of water.

[0029] Preferably, the amine neutralizer comprises at least one of ammonia, N,N-dimethylethanolamine, triethylamine or triethanolamine.

[0030] Preferably, the film forming co-solvent comprises at least one of ethylene glycol butyl ether, propylene glycol methyl ether or diethylene glycol butyl ether.

[0031] Preferably, the wetting agent comprises at least one of acetylenic diol compound, modified polysiloxane, non-ionic surfactant or fluorosurfactant.

[0032] In some embodiments of the present application, the wetting agent comprises at least one of Wet 270, BYK 349, 104E or TWIN 4100.

[0033] Preferably, the defoaming agent comprises at least one of polydimethylsiloxane, mineral oil or acrylate-based defoaming agent.

[0034] In some embodiments of the present application, the defoaming agent comprises at least one of BYK 028, AD01 or TEGO 425.

[0035] Preferably, the adhesion promoter comprises at least one of epoxy phosphate adhesion promoter, titanate adhesion promoter or high molecular polyester adhesion promoter.

[0036] A second aspect of the present application provides a preparation method of the water-based varnish of the first aspect of the present application, comprising the following steps: blending the water-based acrylic resin, the amino resin, the matte powder, the water-based non-ionic dispersant, the polyether-modified silicone leveling agent and the auxiliary agent, then performing high-speed dispersion, finally adding water to perform low-speed mixing to obtain the water-based varnish; the rotation speed of the high-speed dispersion is greater than that of the low-speed mixing.

[0037] Preferably, the rotation speed of the high-speed dispersion is 1000-1500 r / min.

[0038] Preferably, the time of the high-speed dispersion is 25-30 min.

[0039] In some embodiments of the present application, the high-speed dispersion is performed until the fineness of the blend is ≤15 μm.

[0040] Preferably, the rotation speed of the low-speed mixing is 500-800 r / min.

[0041] Preferably, the time of the low-speed mixing is 5-10 min.

[0042] A third aspect of the present application provides a coating layer prepared from the water-based varnish of the first aspect of the present application.

[0043] Preferably, the 60° angle glossiness of the coating is 30-50 GU; further preferably, 35-48 GU.

[0044] In some embodiments of the present application, the coating is an iron gate heat transfer printing coating; further, the iron gate heat transfer printing coating is prepared by the following method: the water-based varnish is coated on an iron gate, and the iron gate heat transfer printing coating is obtained by treating the iron gate using a heat transfer printing process.

[0045] The water-based varnish provided by the present application can transfer various exquisite patterns and colors to the surface of an iron gate, adding artistic atmosphere and individual characteristics to the iron gate. Meanwhile, the heat transfer printing coating has high adhesion, good wear resistance, strong weather resistance and other characteristics, and can protect the surface of the iron gate from damage and prolong the service life of the iron gate.

[0046] The fourth aspect of the present application provides an application of the water-based varnish of the first aspect of the present application in building material coating, furniture coating or indoor decoration.

[0047] In some embodiments of the present application, the building material coating includes door furniture coating, wall coating and the like; the door furniture can be a wooden door, an iron door and the like, and is particularly suitable for an iron door.

[0048] The present application has the following advantages compared with the prior art:

[0049] Specifically, compared with the prior art, the present application has the following advantages:

[0050] 1. The water-based acrylic resin with a number average molecular weight of 2000-3000 g / mol and a hydroxyl value of 90-100 mgKOH / g is used in the present application. The high resin molecular weight can effectively improve the spray adaptability, improve the anti-sagging performance of the coating film, and improve the wet film wetting and spreading on the substrate, which helps to improve the adhesion. However, too high molecular weight will result in high dilution ratio, reduce the solid content of construction, and lead to no film thickness feeling and poor fullness of the dry film after curing. Therefore, the water-based acrylic resin with a specific molecular weight range in the present application has fast surface drying, which can meet the anti-sagging requirements and obtain good fullness.

[0051] 2、Matt powder in the coating curing process, due to the solvent volatilization and shrinkage of the coating film, eventually migrate to the surface of the coating film forming flat sheet, because it can scatter light, light scattering, so as to achieve the effect of extinction, but the matt powder surface is easy to be contaminated and friction damage, affect its color and gloss. Therefore, the surface of matt powder treatment to improve its stability and service life is particularly important. At present, there are mainly chemical treatment, physical treatment, coating treatment and other surface treatment methods. After surface treatment, matt powder feel better, more excellent suspension; and the surface of the matt powder without treatment is more cost-effective, better wettability in water-based system, higher transparency after film forming. The invention is to add the surface of the matt powder, so that it can be mixed with the water-based non-ionic dispersant in the preparation of water-based varnish, and better dispersion effect can be obtained.

[0052] 3、The high molecular superdispersant commonly used in water-based industrial coatings has good pigment dispersion effect, so it can obtain higher gloss and stability than other types of dispersants. However, increasing gloss is contrary to the matt coating, which obviously does not meet the formula design principle. The water-based non-ionic dispersant used in the present application contains pigment affinity group polymer and surface active substance (mainly polyethylene glycol type polyol and polyethylene imine derivative etc.), which can reduce surface tension, has strong adsorption, can make the matt powder arrange in direction, and can relatively reduce the gloss of the coating film after adding.

[0053] 4、In the existing leveling agent, the terminal hydroxyl silicone leveling agent can react with amino group during curing process to provide permanent slip feeling; the fluorocarbon modified silicone has strong anti-porosity ability and good thermal stability, which can promote leveling; the two types of leveling agents are good for the hand feeling of the coating film and the wettability to the substrate, but they have little effect on the gloss change of the coating film. The acrylate leveling agent has more advantages in the final leveling dynamic, that is, the final flatness of the coating film will be better than that of the silicone leveling agent, and the gloss will be higher than that of other types of leveling agents, but the surface tension will be higher than that of the silicone leveling agent, so the leveling dynamic is not as strong as the silicone. The polyether modified silicone leveling agent used in the present application has good compatibility with resin, low surface tension and good control of surface flow effect, and the use of polyether modified silicone can make the gloss of the coating layer decrease by 30-40% under the condition of the same amount of matt powder, and the non-ionic dispersant can also reduce the gloss of the coating film more than the high molecular dispersant, which means that the use of polyether modified silicone leveling agent and non-ionic wetting dispersant can effectively reduce the amount of matt powder in the formula, and thus improve the permeability of the coating film. DETAILED DESCRIPTION

[0054] The present application will be further described in details by specific examples. It should be understood that the following examples are only used to further illustrate the present application, and should not be construed as limiting the scope of the present application. Some non-essential improvements and adjustments made by those skilled in the art according to the principles set forth in the present application are within the scope of the present application. The following examples are only one example in the appropriate range, i.e. those skilled in the art can make appropriate selection within the scope of the present application according to the description herein, and are not limited to the specific data of the following examples. The raw materials, reagents or devices used in the following examples and comparative examples are commercially available or can be obtained by known methods unless otherwise specified.

[0055] It should be noted that the specific information of some raw materials used in the examples and comparative examples of the present application is as follows:

[0056] Aqueous acrylic resin D: number average molecular weight of 3000 g / mol, hydroxyl value of 95 mgKOH / g, grade of Zhen Tian R1385;

[0057] Partially methyl etherified amino resin: grade of Zhanxin cymel 325;

[0058] Mat powder A: uncoated silica, grade of 560N;

[0059] Mat powder OK412: surface treated silica;

[0060] Mat powder C803: surface treated silica;

[0061] Aqueous dispersant B: non-ionic dispersant, grade of SN-1729;

[0062] Aqueous dispersant 32500: super dispersant, purchased from Lubrizol;

[0063] Leveling agent C: polyether modified silicone, grade of SN-4341;

[0064] Leveling agent EFKA3772: fluorocarbon modified acrylate;

[0065] Wetting agent: grade of Tego 4100;

[0066] Defoaming agent: grade of Tego 825;

[0067] Adhesion promoter: grade of Changxing 4901-B-72;

[0068] Amine neutralizer: N,N-dimethylethanolamine;

[0069] Film-forming cosolvent: ethylene glycol butyl ether;

[0070] Film forming co-solvent: diethylene glycol butyl ether.

[0071] Examples 1-5 and Comparative Examples 1-8

[0072] Examples 1-5 and Comparative Examples 1-8 each provide a water-based varnish, the specific components are shown in Table 1 and Table 2, and the specific preparation method is as follows:

[0073] The other components except ionized water are blended, and then high-speed dispersed at 1000-1500 r / min for 25-30 minutes, ionized water is added after detecting fineness ≤ 15 μm, and then low-speed mixed at 500-800 r / min for 5-10 min, to obtain the water-based varnish.

[0074] Table 1 Components and their amounts (unit: mass parts) of Examples 1-5 and Comparative Examples 1-4

[0075]

[0076]

[0077] Table 2 Components and their amounts (unit: mass parts) of Comparative Examples 5-8

[0078]

[0079] Performance test

[0080] The water-based varnish of Examples 1-5 and Comparative Examples 1-8 is sprayed to make a plate, and the specific steps are as follows:

[0081] First, the water-based varnish of Examples 1-5 and Comparative Examples 1-8 is diluted to 25 seconds of spraying, and is sprayed on a black powder coating base plate, with a dry film controlled between 12-15 μm, 150 degree baking and curing for 20 minutes, and after cooling for 1 hour, the following performance tests are carried out:

[0082] Adhesion: determined according to GB / T 9286-2021; 0 level is qualified;

[0083] Hardness: determined according to GB / T 6739-2022; 2H is qualified;

[0084] Impact performance: determined according to GB / T 1732-2020; 50 kg·cm is qualified;

[0085] Transparency: determined according to GB / T 9754-2007; the ratio of 20° gloss to 60° gloss is compared, the larger the ratio, the higher the transparency;

[0086] Dilution ratio: 100 parts of varnish is diluted with water to 2 cups of viscosity value 25 seconds, and the ratio of the weight before dilution to the weight of pure water required for dilution.

[0087] The performance test results are shown in Table 3.

[0088] Table 3 Performance test results of Examples 1-5 and Comparative Examples 1-8

[0089]

[0090] As can be seen from Table 3, Examples 1-5 and Comparative Examples 1-4, the ratio of 20° gloss to 60° gloss (A / B value) of Examples 1-5 are all ≥0.3, while the A / B value of Comparative Examples 1-4 is 0.20-0.25, all less than Examples 1-5, it can be seen that the permeability of Examples 1-5 is better, and the appearance visual results also show that Examples 1-5 have better permeability.

[0091] In Comparative Examples 1-2, no leveling agent is added, and a high molecular super dispersant is used. The high molecular super dispersant has good pigment dispersion effect, so relatively, it can obtain higher gloss and stability than other types of dispersants. However, improving gloss is contrary to the design principle of matte paint, obviously does not meet the design principle. The water-based non-ionic dispersant used in Examples 1-5 of the present application contains pigment affinity group polymer and surfactant (mainly polyethylene glycol type polyol and polyethylene imine derivative, etc.), which can reduce surface tension, has strong adsorption, can make the matte powder arrange in a certain direction, and can relatively reduce the gloss of the coating film after adding.

[0092] Comparative Examples 3-4 do not add dispersant, and a fluorocarbon modified acrylate leveling agent is used. Fluorocarbon modified silicone has strong anti-pitting ability and good thermal stability, which can promote leveling; it has good help to the hand feeling of the coating film and the wetting of the substrate, but it does not play a big role in changing the gloss of the coating film. The polyether modified silicone leveling agent used in Examples 1-5 of the present application has good compatibility with the resin, low surface tension and good control of surface flow effect, and the use of polyether modified silicone can reduce the gloss of the coating by 30-40% under the condition of the same amount of matte powder. In addition, the non-ionic dispersant can also reduce the gloss of the coating film more than the high molecular dispersant, which means that after adding polyether modified silicone and non-ionic wetting dispersant, the two can effectively reduce the amount of matte powder in the formula, and thus improve the permeability of the coating film.

[0093] And, the surface treated silica is used in Comparative Examples 1-4, the matt powder after surface treatment has better hand feeling and more excellent suspension, but is not conducive to dispersion in the water-based system; and the matt powder without surface treatment has higher cost performance, has better wettability in the water-based system, and has higher transparency after film formation. The matt powder without surface treatment is added in Example 1-5, which can be better mixed with the water-based non-ionic dispersant in the preparation process of the water-based varnish, and better dispersion effect is obtained.

[0094] As can be seen from Examples 1-5 and Comparative Examples 5-8, under the condition that other components and amounts are the same, only the number average molecular weight or the hydroxyl value of the water-based acrylic resin is changed, the water-based acrylic resin with a number average molecular weight of 900 is used in Comparative Example 5, and the result after curing is that the A / B value is >0.30, but the 60° gloss is >50GU, the gloss is high, and therefore more matting powder needs to be added, the A / B value will also decrease after the gloss decreases, and at the same time, the cost will increase; and because the resin molecular weight is low, the dilution ratio is very low, which will lead to an increase in the cost of using paint, and easy sagging. The water-based acrylic resin with a number average molecular weight of 4000 is used in Comparative Example 6, and the result after curing is that the dilution ratio is very high, which leads to low solid content during construction, serious dull gloss, and poor fullness. The water-based acrylic resin with a hydroxyl value of 65mgKOH / g is used in Comparative Example 7, and the result after curing is that the adhesion is obviously decreased, the adhesion is not as good as that of the examples, the A / B value is less than 0.3, and the permeability is decreased. The water-based acrylic resin with a hydroxyl value of 120mgKOH / g is used in Comparative Example 8, and the result after curing is that the dilution ratio is high, and the gloss is high, which is difficult to matt, and the cost required for matting is increased.

[0095] In summary, the water-based acrylic resin with specific molecular weight and hydroxyl value, the amino resin, the non-ionic dispersant for dispersing the un-surface treated silica matt powder, and the polyether modified silicone leveling agent are used to obtain a semi-matt water-based varnish with high permeability, which solves the problems of water-based varnish blushing, whitening, and poor permeability, and has wide application in building material coating, furniture coating, or indoor decoration, and especially can obtain good permeability on the hot transfer printing coating of an iron door.

Claims

1. An aqueous clear varnish, characterized by, comprises the following components by mass fraction: water-based acrylic resin 35-50 parts, amino resin 10-20 parts, matte powder 1-3 parts, water-based non-ionic dispersant 0.5-2 parts, polyether-modified silicone leveling agent 0.1-1 part, auxiliary agent 10-25 parts, water 10-30 parts; the number average molecular weight of the water-based acrylic resin is 1500-3500 g / mol; the hydroxyl value of the water-based acrylic resin is 80-110 mgKOH / g; the matte powder is selected from un-surface-treated silicon dioxide.

2. The aqueous varnish according to claim 1, characterized in that, the amino resin is selected from partially methyl etherified amino resin; the etherification degree of the partially methyl etherified amino resin is 40-60%.

3. The aqueous varnish according to claim 1, characterized in that, the water-based non-ionic dispersant comprises polyethylene glycol type polyol, polyethyleneimine compound or a combination thereof.

4. The aqueous varnish according to claim 1, characterized in that, the polyether-modified silicone leveling agent comprises oxirane polyether-modified silicone, oxetane polyether-modified silicone or a combination thereof.

5. The aqueous varnish according to claim 1, characterized in that, the auxiliary agent comprises at least one of amine neutralizer, film-forming co-solvent, wetting agent, defoaming agent or adhesion promoter.

6. The aqueous varnish according to claim 1, characterized in that, the auxiliary agent comprises, by mass fraction: amine neutralizer 1-3 parts, film-forming co-solvent 10-20 parts, wetting agent 0.1-1 part, defoaming agent 0.1-1 part, adhesion promoter 0.1-1.5 parts.

7. The water-based varnish according to claim 5 or 6, characterized in that, the amine neutralizer comprises at least one of ammonia, N,N-dimethylethanolamine, triethylamine or triethanolamine; and / or, the film-forming co-solvent comprises at least one of ethylene glycol butyl ether, propylene glycol methyl ether or diethylene glycol butyl ether; and / or, the wetting agent comprises at least one of acetylenic diol compound, modified polysiloxane, non-ionic surfactant or fluorine-containing surfactant; and / or, the defoaming agent comprises at least one of polydimethylsiloxane, mineral oil or acrylate-based defoaming agent; and / or, the adhesion promoter comprises at least one of epoxy phosphate adhesion agent, titanate adhesion agent or high molecular polyester adhesion agent.

8. A process for the preparation of an aqueous varnish according to any one of claims 1 to 7, characterized in that, comprises the following steps: blending the water-based acrylic resin, amino resin, matte powder, water-based non-ionic dispersant, polyether-modified silicone leveling agent and auxiliary agent, then performing high-speed dispersion, finally adding water to perform low-speed mixing to obtain the water-based varnish.

9. A coating characterized in that, obtained from the water-based varnish according to any one of claims 1-7.

10. The coating of claim 9, wherein, the 60° angle gloss of the coating is 30-50 GU.

11. The coating of claim 9, wherein, the coating is an iron door heat transfer printing coating.

12. Use of the water-based varnish according to any one of claims 1-7 in building material coating, furniture coating or interior decoration.

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