Water-based paint and preparation method thereof

Abstract

The invention discloses a water-based paint and a preparation method thereof. The water-based paint is composed of the following components in percentage by weight: 70-90% of water-based UV resin, 2-4% of a film-forming agent, 1-5% of matting powder, 0.1-2% of a thickening agent, 0.1-3% of an auxiliary agent, 0.5-2% of a photoinitiator and the balance of deionized water. The water-based UV resin, the film-forming agent, the matting powder, the thickening agent, the auxiliary agent and the photoinitiator which are prepared by a specific method are compounded together according to a proper proportion, so that the hardness of the coating is greatly improved, the coating is good in scratch resistance, resistant to damp and heat and free of whitening, the solid content of the prepared coating is 75-90%, the water content is small, and quick drying can be achieved.

Description

Technical Field

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

[0002] With the enhancement of human environmental awareness, countries have successively formulated environmental protection laws and regulations on VOC (volatile organic compounds) emissions, and the emission standards have become increasingly stringent, aiming to encourage the promotion and use of new products that are green, environmentally friendly, energy-saving and emission-reducing. Therefore, in the field of coatings and coatings, the development and application of safe and low-VOC water-based, powder and high-solid content environmentally friendly coatings are imperative. Due to the characteristics of water-based UV coatings that can be realized in many technical ways, wide application, safety, and relatively simple construction, they have developed rapidly in developed countries such as Europe and the United States in recent years and are very popular. With the rise of many 3C electronic products in China, environmentally friendly water-based UV coatings have also begun to develop rapidly in China and have become a very active research and development field in China. Compared with traditional oil-based UV coatings, water-based UV coatings mainly include the following features: (1) reducing the curing shrinkage caused by the large amount of active diluents used, and can be used for coating non-absorbent surfaces, such as plastics; (2) cheap diluent water or thickeners can be used to conveniently control rheology, so that the coating can be used in various coating methods, such as roller coating, flow coating, spray coating, etc.; (3) no high-purity active diluents are used to adjust the viscosity, reducing toxicity and irritation problems; (4) does not contain volatile organic solvents, is not easy to burn, and is relatively safe; (5) can obtain extremely thin coatings to reduce costs; (6) equipment and containers are easy to clean. The present invention is a further development of water-based UV coatings. Summary of the invention

[0003] Based on this, the present invention provides a water-based coating and a preparation method thereof, which has the characteristics of high hardness, good scratch resistance, resistance to moisture and heat without whitening, and short drying time.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] A water-based paint is composed of the following components in weight percentage: 70-90% of water-based UV resin, 2-4% of film former, 1-5% of matting powder, 0.1-2% of thickener, 0.1-3% of auxiliary agent, 0.5-1.5% of photoinitiator and the balance of deionized water.

[0006] In some embodiments, the preparation method of the water-based UV resin is as follows: by mass, 10 to 30 parts of polyhydroxy silicone oil, 3 to 5 parts of low hydrogen silicone oil, 25 to 30 parts of maleic anhydride, 2 to 5 parts of phthalic anhydride, 5 to 10 parts of polyol, 10 to 15 parts of ethylene glycol dimethyl ether, 5 to 7 parts of ethylene glycol dibutyl ether, and 0.1 to 0.5 parts of phosphorous acid are added to a reaction kettle, first heated to 120°C, then heated to 220°C at 7°C / h, kept at 200 to 230°C for 4 to 6h until the acid value is 50 to 70mgKOH / g, then cooled to 90°C, added 6 to 9 parts of a neutralizer for neutralization for 30min to 1h, and then added 40 to 60 parts of water for high-speed stirring and emulsification to obtain a water-based UV resin; the viscosity of the polyhydroxy silicone oil is 25 to 40mm 2 / s, the mass percentage of hydroxyl is 11-14%; the viscosity of the low hydrogen silicone oil is 30-45mm 2 / s, the mass percentage of active hydrogen is 0.2~0.3%.

[0007] The water-based UV resin prepared by the present invention is modified by hydroxy silicone oil and hydrogen silicone oil, and a mixture of Omnirad 500 and IRGACURE 2959 of BASF is used as a photoinitiator to increase the crosslinking density after UV curing. The synergistic effect of the two greatly improves the hardness, scratch resistance and moisture and heat resistance of the water-based coating, and at the same time improves the surface drying time of the water-based coating.

[0008] The water-based coating of the present invention has high hardness, good scratch resistance, and is resistant to moisture and heat without whitening, and can also improve the wear resistance of the water-based coating.

[0009] In some embodiments, the film former is at least one of dipropylene glycol butyl ether and tripropylene glycol butyl ether.

[0010] In some embodiments, the film-forming agent is a mixture of dipropylene glycol butyl ether and tripropylene glycol butyl ether, and the mass ratio of the dipropylene glycol butyl ether to the tripropylene glycol butyl ether is 1:(1-2).

[0011] The film-forming agents dipropylene glycol butyl ether and tripropylene glycol butyl ether in the present invention have the characteristics of high film-forming efficiency, environmental protection, low toxicity, etc. Compounding dipropylene glycol butyl ether and tripropylene glycol butyl ether in a specific ratio can greatly improve the film-forming rate of water-based paint, and the paint film is plump and beautiful.

[0012] In some embodiments, the matting agent is Degussa OK-607, the thickener is at least one of Dow RM-12W and Mingling PUR-40, and the photoinitiator is a mixture of IGM photoinitiator Omnirad500 and BASF's IRGACURE 2959.

[0013] Degussa matting agent OK-607 in the present invention is an easily dispersible, organically treated precipitated silica matting agent, with a very small average particle size of 2 microns, and is an ideal matting agent for thinner coating layers, capable of obtaining a good coating surface. It has the characteristics of easy dispersion, good transparency, small dosage, good matting properties, increased slipperiness, and good suspension properties.

[0014] The thickeners Dow RM-12W and Mingling PUR-40 in the present invention have the characteristics of low dosage and high thickening efficiency. Among them, Dow RM-12W has excellent anti-sagging performance, minimizes the impact on flow and leveling, can give the coating good thixotropy, improve the ability of paint brushes or rollers to dip paint, provide good anti-drip properties, good can structure and excellent flow / sagging balance. Compounding with Mingling PUR-40 can further promote flow / sagging balance.

[0015] IRGACURE 500 in the present invention is a liquid mixture of two photoinitiators, which is used to initiate UV polymerization reaction of unsaturated prepolymerization system and has the characteristics of small addition amount and high initiation efficiency.

[0016] In some embodiments, the auxiliary agent includes at least one of a wetting agent, a leveling agent, a defoaming agent, an anti-settling agent and a dispersant.

[0017] In some embodiments, the auxiliary agent is a mixture of a wetting agent, a leveling agent, a defoaming agent, an anti-settling agent and a dispersant.

[0018] The additive of the present invention has the characteristics of small dosage and large effect, wherein the wetting agent is BYK-346, the chemical composition of which is a polyether-modified siloxane solution, and has the function of strongly reducing surface tension and significantly improving the wetting ability of the substrate. The leveling agent can be a commercially available leveling agent. The present invention adopts Glide 450, the defoaming agent is Airex 902W, the anti-settling agent is BYK-420, the main chemical component is modified urea solution, used in emulsion and water-diluted resin system, improves anti-settling and anti-sagging performance, and is added to the formulation system of the present invention so that the additive can form a three-dimensional network structure, which can produce thixotropic flow properties, prevent sedimentation and improve sagging performance. The dispersant is Dispers752W is an anionic wetting and dispersing agent, containing an aqueous solution of a copolymer with high pigment affinity groups, with excellent transparency and good stability.

[0019] The present invention also provides a method for preparing a water-based coating, comprising the following steps: 1) adding half of the water-based UV resin, dispersant, defoamer, anti-settling agent, film-forming agent and thickener to a production cylinder, washing the cylinder with part of deionized water and adjusting the dispersion state, dispersing at a speed of 2000-2500 rpm for 10-15 minutes, wherein the washing machine is used to clean the inner periphery and the dispersion axis of the production cylinder; 2) adding the matting powder to the production cylinder of step 1), washing the cylinder with part of deionized water and adjusting the dispersion state, dispersing at a speed of 2000-2500 rpm for 10-15 minutes, and detecting the fineness of the dispersion liquid to be ≤25 microns; 3) adding the water-based UV resin, wetting agent, leveling agent and photoinitiator to the production cylinder of step 2) in sequence, dispersing at a speed of 1200-1500 rpm for 10-15 minutes; 4) adding the remaining deionized water, washing the cylinder and stirring evenly.

[0020] In some of the embodiments, vacuum degassing is also performed in step 1), step 2), step 3) and step 4).

[0021] The water-based coating and preparation method provided by the present invention have the following advantages over the prior art:

[0022] Beneficial effects:

[0023] The invention compounds water-based UV resin prepared by a specific method, a film former, a matting powder, a thickener, an auxiliary agent and a photoinitiator in an appropriate ratio, so that the hardness of the water-based coating is greatly improved, the scratch resistance is good, the moisture and heat resistance is not whitened, and the prepared water-based coating has a solid content of 75-90%, a low water content, and can achieve quick drying.

[0024] A special production process of vacuum degassing is adopted in the preparation process, so that the water-based paint can keep very few bubbles both in the production process and in the storage process. In addition, due to the use of the degassing process, the defoaming agent added to the formula is consumed very little in the production process, ensuring that the product can have good defoaming properties during construction, significantly reducing the generation of bubbles during construction, and solving the common problem of defoaming difficulty in water-based paints.

[0025] The water-based paint of the present invention can be used as interior wall paint, wood paint, etc., and can also improve adhesion, wear resistance and stain resistance when used as interior wall paint. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific embodiments.

[0027] Example 1

[0028] A water-based coating is composed of the following components in weight percentage: 70% of water-based UV resin, 2% of dipropylene glycol butyl ether, 5% of Degussa OK-607, 2% of Dow RM-12W, 0.5% of BYK-346, 0.4% of Glide 450, 0.5% of Airex 902W, 0.6% of BYK-420, 1% of Dispers 752W, 0.6% of IGM photoinitiator Omnirad 500, 0.9% of IRGACURE2959, and the balance of deionized water.

[0029] The preparation method of the water-based UV resin is as follows: by weight, 30 parts of polyhydroxy silicone oil, 3 parts of low hydrogen silicone oil, 30 parts of maleic anhydride, 2 parts of phthalic anhydride, 10 parts of polyol, 10 parts of ethylene glycol dimethyl ether, 7 parts of ethylene glycol dibutyl ether, and 0.1 part of phosphorous acid are added to a reaction kettle, first heated to 120°C, then heated to 220°C at 7°C / h, kept at 230°C for 4h until the acid value reaches 70mgKOH / g, then cooled to 90°C, added with 6 parts of a neutralizer for neutralization for 1h, and then added with 60 parts of water for high-speed stirring and emulsification to obtain a water-based UV resin; the viscosity of the polyhydroxy silicone oil is 25mm 2 / s, the mass percentage of hydroxyl is 11%; the viscosity of the low hydrogen silicone oil is 45mm 2 / s, the mass percentage of active hydrogen is 0.3%.

[0030] The preparation method of the above-mentioned embodiment 1 comprises the following steps: 1) adding half of the water-based UV resin, Dispers752W, Airex 902W, BYK-420, dipropylene glycol butyl ether and Dow RM-12W to a production tank, washing the machine with part of deionized water and adjusting the dispersion state, and dispersing at a speed of 2500 rpm for 10 minutes, wherein the washing machine is used to clean the inner periphery of the production tank and the dispersion axis; 2) adding Degussa OK-607 to the production tank of step 1), washing the machine with part of deionized water and adjusting the dispersion state, and dispersing at a speed of 2500 rpm for 10 minutes, and detecting the fineness of the dispersion liquid to be ≤25 microns; 3) adding the remaining water-based UV resin, BYK-346, Glide 450 and IGM photoinitiator Omnirad 500, IRGACURE 2959 is added to the production cylinder of step 2) in sequence, and dispersed at a speed of 1200 rpm for 15 minutes; 4) the remaining deionized water is added, and the machine is washed and stirred evenly. It also includes vacuum degassing in step 1), step 2), step 3) and step 4), and the vacuum degassing can be performed according to conventional operations.

[0031] Example 2

[0032] A water-based coating is composed of the following components in weight percentage: 90% of water-based UV resin, 4% of tripropylene glycol butyl ether, 1% of Degussa OK-607, 0.1% of Mingling PUR-40, 0.1% of Airex 902W, 0.3% of IGM photoinitiator Omnirad 5000, 0.2% of IRGACURE 2959, and the balance of deionized water.

[0033] The preparation method of the water-based UV resin is as follows: by weight, 10 parts of polyhydroxy silicone oil, 5 parts of low-hydrogen silicone oil, 25 parts of maleic anhydride, 5 parts of phthalic anhydride, 5 parts of polyol, 15 parts of ethylene glycol dimethyl ether, 5 parts of ethylene glycol dibutyl ether, and 0.5 parts of phosphorous acid are added to a reaction kettle, first heated to 120°C, then heated to 220°C at 7°C / h, kept at 200°C for 6h until the acid value reaches 50mgKOH / g, then cooled to 90°C, added with 6-9 parts of a neutralizer for neutralization for 30min, and then added with 40 parts of water for high-speed stirring and emulsification to obtain a water-based UV resin; the viscosity of the polyhydroxy silicone oil is 40mm 2 / s, the mass percentage of hydroxyl is 14%; the viscosity of the low hydrogen silicone oil is 30mm 2 / s, the mass percentage of active hydrogen is 0.2%.

[0034] The preparation method of the above-mentioned embodiment 2 comprises the following steps: 1) adding half of the water-based UV resin, Airex902W, tripropylene glycol butyl ether and Mingling PUR-40 to a production tank, washing the machine with part of deionized water and adjusting the dispersion state, dispersing at a speed of 2000 rpm for 15 minutes, wherein the washing machine is used to clean the inner periphery and the dispersion axis of the production tank; 2) adding Degussa OK-607 to the production tank of step 1), washing the machine with part of deionized water and adjusting the dispersion state, dispersing at a speed of 2000 rpm for 15 minutes, and detecting the fineness of the dispersion liquid to ≤25 microns; 3) adding the remaining water-based UV resin, and IGM photoinitiator Omnirad 500 and IRGACURE 2959 to the production tank of step 2) in sequence, dispersing at a speed of 1500 rpm for 10 minutes; 4) adding the remaining deionized water, washing the machine and stirring evenly. The method also includes vacuum degassing in step 1), step 2), step 3) and step 4), and the vacuum degassing can be performed according to conventional operations.

[0035] Example 3

[0036] A water-based coating is composed of the following components in weight percentage: 80% of water-based UV resin, 1% of dipropylene glycol butyl ether, 2% of tripropylene glycol butyl ether, 3% of Degussa OK-607, 1% of Dow RM-12W, 0.9% of BYK-346, 0.8% of Glide 450, 0.1% of Airex 902W, 0.2% of BYK-420, 0.5% of Dispers 752W, 0.5% of IGM photoinitiator Omnirad500, 0.5% of IRGACURE 2959, and the balance of deionized water.

[0037] The preparation method of the water-based UV resin is as follows: by weight, 20 parts of polyhydroxy silicone oil, 4 parts of low hydrogen silicone oil, 27 parts of maleic anhydride, 4 parts of phthalic anhydride, 8 parts of polyol, 13 parts of ethylene glycol dimethyl ether, 6 parts of ethylene glycol dibutyl ether, and 0.3 parts of phosphorous acid are added to a reaction kettle, first heated to 120°C, then heated to 220°C at 7°C / h, and kept at 220°C for 5h until the acid value reaches 60mgKOH / g, then cooled to 90°C, 7 parts of a neutralizer are added, neutralized for 50min, and then 50 parts of water are added and stirred at high speed for emulsification to obtain a water-based UV resin; the viscosity of the polyhydroxy silicone oil is 30mm 2 / s, the mass percentage of hydroxyl is 13%; the viscosity of the low hydrogen silicone oil is 40mm 2 / s, the mass percentage of active hydrogen is 0.3%.

[0038] The preparation method of the above-mentioned Example 3 comprises the following steps: 1) adding half of the water-based UV resin, Dispers752W, Airex 902W, BYK-420, dipropylene glycol butyl ether, tripropylene glycol butyl ether and Dow RM-12W to a production tank, washing the machine with part of deionized water and adjusting the dispersion state, dispersing at a speed of 2300 rpm for 13 minutes, wherein the washing machine is used to clean the inner periphery of the production tank and the dispersion axis; 2) adding Degussa OK-607 to the production tank of step 1), washing the machine with part of deionized water and adjusting the dispersion state, dispersing at a speed of 2200 rpm for 12 minutes, and detecting the fineness of the dispersion liquid to be ≤25 microns; 3) adding the remaining water-based UV resin, BYK-346, Glide 450 and IGM photoinitiator Omnirad 500, IRGACURE 2959 is added to the production cylinder of step 2) in sequence, and dispersed at a speed of 1300 rpm for 10 minutes; 4) the remaining deionized water is added, and the machine is washed and stirred evenly. It also includes vacuum degassing in step 1), step 2), step 3) and step 4), and the vacuum degassing can be performed according to conventional operations.

[0039] Example 4

[0040] A water-based coating is composed of the following components in weight percentage: 80% of water-based UV resin, 1% of dipropylene glycol butyl ether, 1% of tripropylene glycol butyl ether, 2% of Degussa OK-607, 0.3% of Mingling PUR-40, 0.4% of BYK-346, 0.6% of Glide 450, 0.2% of Airex 902W, 0.4% of BYK-420, 0.4% of Dispers 752W, 0.8% of IGM photoinitiator Omnirad500, 0.5% of IRGACURE 2959, and the balance of deionized water.

[0041] The preparation method of the water-based UV resin is as follows: by weight, 13 parts of polyhydroxy silicone oil, 3 parts of low hydrogen silicone oil, 26 parts of maleic anhydride, 4 parts of phthalic anhydride, 7 parts of polyol, 14 parts of ethylene glycol dimethyl ether, 5 parts of ethylene glycol dibutyl ether, and 0.4 parts of phosphorous acid are added to a reaction kettle, first heated to 120°C, then heated to 220°C at 7°C / h, kept at 210°C for 6h until the acid value reaches 60mgKOH / g, then cooled to 90°C, added with 8 parts of a neutralizer for neutralization for 40min, and then added with 50 parts of water for high-speed stirring and emulsification to obtain a water-based UV resin; the viscosity of the polyhydroxy silicone oil is 35mm 2 / s, the mass percentage of hydroxyl is 12%; the viscosity of the low hydrogen silicone oil is 35mm 2 / s, the mass percentage of active hydrogen is 0.2%.

[0042] The preparation method of the above-mentioned Example 4 comprises the following steps: 1) adding half of the water-based UV resin, Dispers752W, Airex 902W, BYK-420, dipropylene glycol butyl ether, tripropylene glycol butyl ether and Mingling PUR-40 to a production tank, washing the machine with part of deionized water and adjusting the dispersion state, and dispersing at a speed of 2500 rpm for 10 minutes, wherein the washing machine is used to clean the inner periphery of the production tank and the dispersion axis; 2) adding Degussa OK-607 to the production tank of step 1), washing the machine with part of deionized water and adjusting the dispersion state, and dispersing at a speed of 2500 rpm for 15 minutes, and detecting the fineness of the dispersion liquid to be ≤25 microns; 3) adding the remaining water-based UV resin, BYK-346, Glide 450 and IGM photoinitiator Omnirad 500, IRGACURE 2959 is added to the production cylinder of step 2) in sequence, and dispersed for 15 minutes at a speed of 1500 rpm; 4) the remaining deionized water is added, and the machine is washed and stirred evenly. It also includes vacuum degassing in step 1), step 2), step 3) and step 4), and the vacuum degassing can be performed according to conventional operations.

[0043] Comparative Example 1

[0044] The difference from Example 3 is that the water-based UV resin in Comparative Example 1 is allnex IRR902.

[0045] Comparative Example 2

[0046] The difference from Example 3 is that the water-based UV resin in Comparative Example 2 is Urosin4617.

[0047] Comparative Example 3

[0048] The difference from Example 3 is that the water-based UV resin in Comparative Example 3 is a mixture of allnex IRR902 and allnex IRR902, and the mass ratio of allnex IRR902 to allnex IRR902 is 1:1.

[0049] Comparative Example 4

[0050] The difference from Example 3 is that in the preparation method of the water-based UV resin in Comparative Example 4, hydroxy silicone oil and hydrogen silicone oil are not added.

[0051] The water-based coatings prepared in Examples 1-4 and Comparative Examples 1-4 were tested for hardness, scratch resistance, moisture and heat resistance, and drying time. The test methods are as follows:

[0052] Hardness: GBT 6739-2006 Paint and varnish pencil method for determining paint film hardness

[0053] Scratch resistance: scratched with fingernails

[0054] Moisture and heat resistance: GBT 4893.2-2005 Determination of moisture and heat resistance of furniture surface

[0055] Drying time: GB / T 1728 "Determination of drying time of paint film and putty"

[0056] The performance indicators are shown in Table 1 below:

[0057] Table 1

[0058] index hardness Scratch resistance Heat and humidity resistance Drying time Example 1 2H Minor scratches No whitening 150s Example 2 2H No scratches No whitening 130s Example 3 3H No scratches No whitening 100s Example 4 3H No scratches No whitening 120s Comparative Example 1 B There are many scratches Severe whitening 500s Comparative Example 2 B There are many scratches Severe whitening 450s Comparative Example 3 B There are a few scratches Slightly whitish 300s Comparative Example 4 B There are a few scratches Slightly whitish 350s

[0059] It can be seen from Table 1 that the water-based coatings of Examples 1-4 of the present invention have high hardness, good scratch resistance, good moisture and heat resistance, and short drying time.

[0060] In the absence of conflict, the above embodiments and features in the embodiments can be combined with each other. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the protection scope of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A water-based paint, characterized in that: The invention is composed of the following components in percentage by weight: 70-90% of water-based UV resin, 2-4% of film former, 1-5% of matting powder, 0.1-2% of thickener, 0.1-3% of auxiliary agent, 0.5-1.5% of photoinitiator and the balance of deionized water.

2. The water-based paint according to claim 1, characterized in that: The preparation method of the water-based UV resin is as follows: by weight, 10 to 30 parts of polyhydroxy silicone oil, 3 to 5 parts of low hydrogen silicone oil, 25 to 30 parts of maleic anhydride, 2 to 5 parts of phthalic anhydride, 5 to 10 parts of polyol, 10 to 15 parts of ethylene glycol dimethyl ether, 5 to 7 parts of ethylene glycol dibutyl ether, and 0.1 to 0.5 parts of phosphorous acid are added to a reaction kettle, first heated to 120°C, and then heated to 220°C at 7°C / h. ℃, 200-230℃, keep warm for 4-6h until the acid value is 50-70mgKOH / g, then cool to 90℃, add 6-9 parts of neutralizer and neutralize for 30min-1h, then add 40-60 parts of water, stir and emulsify at high speed to obtain water-based UV resin; the viscosity of the polyhydroxy silicone oil is 25-40mm2 / s, the mass percentage of hydroxyl is 11-14%; the viscosity of the low hydrogen silicone oil is 30-45mm 2 / s, the mass percentage of active hydrogen is 0.2~0.3%.

3. The water-based paint according to claim 1, characterized in that: The film former is at least one of dipropylene glycol butyl ether and tripropylene glycol butyl ether.

4. The water-based paint according to claim 3, characterized in that: The film-forming agent is a mixture of dipropylene glycol butyl ether and tripropylene glycol butyl ether, and the mass ratio of the dipropylene glycol butyl ether to the tripropylene glycol butyl ether is 1:(1-2).

5. The water-based paint according to claim 1, characterized in that: The matting powder is Degussa OK-607, the thickener is at least one of Dow RM-12W and Mingling PUR-40, and the photoinitiator is a mixture of IGM photoinitiator Omnirad 500 and BASF's IRGACURE 2959.

6. The water-based paint according to claim 1, characterized in that: The auxiliary agent includes at least one of a wetting agent, a leveling agent, a defoaming agent, an anti-settling agent and a dispersant.

7. The water-based paint according to claim 6, characterized in that: The auxiliary agent is a mixture of a wetting agent, a leveling agent, a defoaming agent, an anti-settling agent and a dispersant.

8. A method for preparing a water-based coating as claimed in any one of claims 1 to 7, characterized in that: The method comprises the following steps: 1) adding half of the water-based UV resin, dispersant, defoamer, anti-settling agent, film-forming agent and thickener to a production tank, washing the tank with part of deionized water and adjusting the dispersion state, dispersing the mixture at a speed of 2000-2500 rpm for 10-15 minutes, wherein the washing machine is used to clean the inner periphery and the dispersion axis of the production tank; 2) adding the matting powder to the production tank of step 1), washing the tank with part of deionized water and adjusting the dispersion state, dispersing the mixture at a speed of 2000-2500 rpm for 10-15 minutes, and detecting the fineness of the dispersion liquid to be ≤25 microns; 3) adding the remaining water-based UV resin, wetting agent, leveling agent and photoinitiator to the production tank of step 2) in sequence, dispersing the mixture at a speed of 1200-1500 rpm for 10-15 minutes; and 4) adding the remaining deionized water, washing the tank and stirring the mixture evenly.

9. The method according to claim 8, characterized in that The invention also includes vacuum degassing in step 1), step 2), step 3) and step 4).