A white paste, an aqueous coating comprising the white paste, and a method for preparing and using the same

Abstract

The application discloses white color paste, water-based paint containing the white color paste and a preparation method thereof, and belongs to the technical field of paint; the white color paste provided by the application can obtain color paste with good dispersibility by selecting appropriate components, and the stability of the color paste is excellent; when the white color paste is further applied to water-based paint, the white color paste has good compatibility with other components in the paint, especially polyurethane modified acrylic resin, so that the coating can be endowed with excellent anti-pollution, scratch resistance, hardness, gloss, adhesion, aging resistance and other properties. Meanwhile, the application mode of the water-based paint provided by the application is simple, and the water-based paint can form a coating with excellent properties by once light curing, so that the water-based paint can be widely used in the preparation of wood-imitating devices and the performance of the wood-imitating devices is improved. Moreover, the preparation method of the white color paste and the water-based paint provided by the application is simple in operation and is beneficial to practical production and application.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and particularly relates to a white pigment, an aqueous coating containing the white pigment, a preparation method thereof, and its application. Background Technology

[0002] Wood varnishes, as a commonly used coating, are widely used in my country. However, with the growing awareness of environmental protection, the furniture market is currently trending towards wood-look furniture. The market is gradually replacing traditional wooden furniture by using plastic to create wood-look components, thus protecting forest resources. On the other hand, using wood-look components alone cannot meet consumer needs, including decorative, durable, and environmentally friendly requirements. Therefore, just as wood varnishes provide wood-look components with rich properties, wood-look varnishes also need to be coated with appropriate layers to achieve even better performance. Thus, developing new wood-look varnish coatings has become an urgent need for promoting wood-look furniture.

[0003] UV-curable coatings, especially ultraviolet (UV)-curable coatings, have been a development direction strongly promoted by the government in recent years. They offer advantages such as high curing efficiency, energy saving, and low pollution. However, most UV-curable coatings currently available are still traditional solvent-based, which are not friendly to coating application workers and the environment. Furthermore, solvent-based UV-curable coatings have a large shrinkage rate after curing, easily leading to coating defects. Therefore, water-based UV-curable coatings have become a new direction in coating research and development.

[0004] Titanium dioxide, a commonly used filler in coatings, possesses excellent colorability, scratch resistance, and certain cleaning properties, and is currently widely used in white pigments. Titanium dioxide pigments are also frequently used in wood coatings. For example, patent CN103614005B mentions the preparation of a water-based titanium dioxide pigment for wood coatings. However, currently, there is no work on titanium dioxide pigments for water-based coatings used in wood-look paints. Therefore, this invention will develop a matching titanium dioxide white pigment for water-based wood-look paints to further improve the performance of these coatings. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a white pigment paste with excellent stability and good compatibility with resin, thereby enabling the water-based coating to achieve high hardness, excellent scratch resistance and stain resistance when used on imitation wood products, as well as the preparation method and application of the water-based coating paste.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a white pigment paste comprising the following components in parts by weight:

[0007] 0.1-1 parts polyvinylpyrrolidone, 0.5-2 parts wetting agent, 1-3 parts cosolvent, 0.4-1 part coupling agent, 0.1-0.4 parts defoamer, 40-80 parts titanium dioxide, 0.5-2 parts anti-settling agent, 10-20 parts water;

[0008] The average molecular weight of the polyvinylpyrrolidone is ≥24,000.

[0009] The white pigment provided by this invention, by selecting appropriate mass fractions of components and choosing polyvinylpyrrolidone with a specific average molecular weight, makes titanium dioxide hydrophilic, resulting in a pigment with good dispersibility and excellent stability, without coarsening, stratification, or skinning during storage. Furthermore, when the white pigment provided by this invention is subsequently applied to water-based coatings, it exhibits good compatibility with other components in the coating, especially polyurethane-modified acrylic resin, thereby imparting excellent anti-fouling, scratch resistance, hardness, gloss, adhesion, and aging resistance properties to the coating.

[0010] In a preferred embodiment of the white pigment of the present invention, the mass ratio of polyvinylpyrrolidone to titanium dioxide is (0.5-0.8):(60-70).

[0011] This invention has found that the mass ratio of polyvinylpyrrolidone to titanium dioxide in white pigment paste affects the overall performance of the product. When the mass ratio of the two is within the range mentioned above, the resulting white pigment paste exhibits excellent stability, and when applied to the preparation of subsequent water-based coatings, the resulting coating exhibits excellent overall performance.

[0012] In a preferred embodiment of the white pigment of the present invention, the polyvinylpyrrolidone has an average molecular weight of 38,000-44,000.

[0013] This invention has discovered that the molecular weight of polyvinylpyrrolidone also affects the performance of the product. When the average molecular weight is further selected to be 38,000-44,000, the prepared white pigment has moderate viscosity, excellent storage stability and moderate processing difficulty. When applied to the preparation of subsequent water-based coatings, the resulting coating has excellent appearance, high hardness and other superior properties.

[0014] As a preferred embodiment of the white pigment of the present invention, at least one of the following (a)-(h) is used:

[0015] (a) The wetting agent includes at least one of organosilicon acrylate, polyether-modified polysiloxane, ethoxylated unsaturated fatty acid monoethanolamide, and polyphosphate;

[0016] (b) The cosolvent includes at least one of ethylene glycol, diethylene glycol, ethylene glycol butyl ether, and propylene glycol methyl ether;

[0017] (c) The coupling agent includes at least one of siloxane coupling agents and titanate coupling agents;

[0018] (d) The defoamer includes at least one of nonionic alkyne, polyether-modified polysiloxane, mineral oil emulsion, and acrylic emulsion;

[0019] (e) The anti-settling agent includes at least one of organic bentonite, polyamide wax, and titanate coupling agent;

[0020] (f) The titanium dioxide includes at least one of rutile titanium dioxide, anatase titanium dioxide, or nano titanium dioxide.

[0021] The present invention has found that the effects of the present invention can be achieved by selecting the above-mentioned types of wetting agents, cosolvents, coupling agents, defoamers, antisettling agents, and titanium dioxide.

[0022] In a preferred embodiment of the white pigment of the present invention, the average particle size of the white pigment is ≤30μm.

[0023] This invention has found that the average particle size of white pigment affects the storage stability of the product and its compatibility with other components in water-based coatings. When the average particle size of the selected white pigment is ≤30μm, the stability of the white pigment can be guaranteed and the water-based coating with excellent overall performance can be obtained in subsequent applications.

[0024] In a second aspect, the present invention provides a method for preparing the white pigment, the method comprising the following steps:

[0025] (1) Mix and disperse polyvinylpyrrolidone with some water, then heat to dissolve, to obtain an aqueous solution of polyvinylpyrrolidone;

[0026] (2) Wetting agent, cosolvent, coupling agent, defoamer and titanium dioxide were added to the polyvinylpyrrolidone aqueous solution in sequence, and then stirred and dispersed at room temperature;

[0027] (3) Next, add the anti-settling agent and the remaining water and continue stirring to disperse;

[0028] (4) After dispersion, grind to obtain a white paste.

[0029] In a preferred embodiment of the preparation method described in this invention, the water portion accounts for 60-95% of the total water volume.

[0030] As a preferred embodiment of the preparation method of the present invention, in step (1), the mixing and dispersing speed is 600-800 r / min, the heating and dissolving temperature is 50-60℃, and the dissolution is carried out until there are no obvious particles.

[0031] In a preferred embodiment of the preparation method of the present invention, in step (2), the stirring speed is 1400-1600 r / min and the dispersion time is 15-30 min.

[0032] As a preferred embodiment of the preparation method of the present invention, in step (3), before adding the anti-settling agent and the remaining water, the stirring speed is reduced to 800-1000 r / min, and the stirring and dispersion time is 10-20 min.

[0033] In a preferred embodiment of the preparation method of the present invention, in step (4), the material is ground until the average particle size is ≤30μm.

[0034] The present invention has found that the white pigment prepared by the preparation method of the present invention has excellent storage stability and can cooperate with the components in subsequent water-based coatings to achieve excellent coating effects.

[0035] In a third aspect, the present invention provides a water-based coating comprising the following components by mass percentage:

[0036] 30-80% polyurethane modified acrylic resin, 1-5% photoinitiator, 0.1-0.7% leveling agent, 1-10% pH adjuster, 2-7% cosolvent, 0.2-0.6% thickener, 15-45% white pigment, 3-7% matting agent, balance water;

[0037] The white pigment is the white pigment described in this invention;

[0038] The polyurethane-modified acrylic resin is a tetrafunctional polyurethane-modified acrylic resin or a hexafunctional polyurethane-modified acrylic resin.

[0039] The water-based coating provided by this invention selects the white pigment prepared by this invention as the pigment additive, and combines it with tetrafunctional polyurethane modified acrylic resin or hexafunctional polyurethane modified acrylic resin. The two have good compatibility, so when they are subsequently prepared into a coating, the resulting coating has excellent hardness, scratch resistance, stain resistance, and aging resistance, and the coating has a good appearance and excellent adhesion.

[0040] In a preferred embodiment of the water-based coating of the present invention, the mass ratio of the polyurethane modified acrylic resin to the white pigment is 60:(10-30).

[0041] This invention has found that the mass ratio of polyurethane-modified acrylic resin to white pigment affects the overall performance of the subsequent coating. When the mass ratio of the two is further selected within the above-mentioned range, the overall performance of the obtained product is even better.

[0042] As a preferred embodiment of the water-based coating of the present invention, at least one of the following (g)-(l) is used:

[0043] (g) The photoinitiator comprises at least one of 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, 2-hydroxy-2-methylphenylpropanone and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide;

[0044] (h) The leveling agent includes at least one of polyether-modified dimethylsiloxane, polyester-modified dimethylsiloxane, organosilicon surfactant, and fluorinated surfactant polymer;

[0045] (i) The pH adjuster includes at least one of triethanolamine, methyldiethanolamine, AMP-95, and ethanolamine phosphate;

[0046] (j) The cosolvent includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, and anti-whitening agent;

[0047] (k) The thickener includes at least one of carboxymethyl cellulose, hydroxyethyl cellulose, guar gum, polyacrylamide, and polyethylene wax;

[0048] (l) The matting powder includes at least one of ultrafine silica, talc, calcium stearate, and polyethylene wax.

[0049] The present invention has found that when the selected components in the water-based coating are of the above-mentioned types, they can all have good compatibility with polyurethane-modified acrylic resin and white pigment, thereby achieving the technical effect of the present invention.

[0050] In a fourth aspect, the present invention provides a method for preparing the water-based coating, the method comprising the following steps:

[0051] The components of water-based coatings are mixed evenly to obtain water-based coatings.

[0052] In a fifth aspect, the present invention provides the application of the water-based coating in the preparation of wood-like components.

[0053] The water-based coating provided by this invention can be applied to imitation wood products. The coating formed on the imitation wood products has excellent hardness, scratch resistance, stain resistance, aging resistance and excellent appearance, which can effectively help improve the performance of imitation wood products.

[0054] For example, the wood-look device includes wood-look furniture.

[0055] In a sixth aspect, the present invention provides a method for applying the water-based coating, the method comprising: spraying the water-based coating onto a substrate surface, drying it at 50-80°C until the moisture evaporates, and then applying it at 500-2000 mJ / cm². 2 The coating is obtained by curing the film under ultraviolet light.

[0056] The water-based coating provided by this invention has a simple application method, requiring only one UV curing cycle to achieve cross-linking of the coating, and the resulting coating exhibits excellent overall performance.

[0057] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0058] The white pigment provided by this invention, by selecting appropriate mass proportions of components and compounding it with titanium dioxide using polyvinylpyrrolidone with a specific average molecular weight, enhances the hydrophilicity of titanium dioxide while achieving a pigment with good dispersibility and excellent stability, exhibiting no coarsening, stratification, or skinning during storage. Furthermore, when applied to water-based coatings, the white pigment provides good compatibility with other components, especially polyurethane-modified acrylic resins, thereby imparting excellent anti-fouling, scratch resistance, hardness, gloss, adhesion, and aging resistance to the coating. Simultaneously, the water-based coating provided by this invention is simple to apply, requiring only one photocuring step to form a high-performance coating, making it widely applicable in the preparation of imitation wood products, enhancing their performance. Moreover, the preparation methods of the white pigment and water-based coating provided by this invention are simple to operate, facilitating practical production applications. Detailed Implementation

[0059] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0060] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in the art; and unless otherwise specified, the components used in the examples and comparative examples are the same.

[0061] 1. Raw materials used in white pigment paste:

[0062] PVP-1: PVP-K30, with an average molecular weight of 38,000, provided by Yuemei Chemical Co., Ltd.

[0063] PVP-2: PVP-K32, with an average molecular weight of 44,000, provided by Yuemei Chemical Co., Ltd.

[0064] PVP-3: PVP-K25, with an average molecular weight of 24,000, provided by Yuemei Chemical Co., Ltd.

[0065] PVP-4: PVP-K60, with an average molecular weight of 210,000, provided by Yuemei Chemical Co., Ltd.

[0066] PVP-5: PVP-K15, with an average molecular weight of 7600, provided by Yuemei Chemical Co., Ltd.

[0067] Titanium dioxide 1: Rutile titanium dioxide, provided by Shandong Hongying Chemical Co., Ltd.

[0068] Titanium dioxide 2: Anatase titanium dioxide, provided by Shandong Hongying Chemical Co., Ltd.

[0069] Titanium dioxide 3: Nano titanium dioxide, provided by Shandong Hongying Chemical Co., Ltd.

[0070] Wetting agent: Polysiloxane, wet270, provided by DIG;

[0071] Cosolvent: Ethylene glycol butyl ether, commercially available;

[0072] Coupling agent: Silane coupling agent, KH-560, provided by Shin-Etsu;

[0073] Defoamer: Organosilicon polymer, BYK-028, supplied by BYK Reagents;

[0074] Anti-settling agent: Modified urea solution, BYK-410, provided by BYK Reagents;

[0075] 2. Raw materials used in water-based coatings:

[0076] Polyurethane modified acrylic resin 1: L-9380W, tetrafunctional group, provided by Lankeluo;

[0077] Polyurethane modified acrylic resin 2: SW7800s, hexafunctional group, provided by Sanwang Chemical.

[0078] Polyurethane modified acrylic resin 3: WU3202X, bifunctional group, provided by Wuxing Resin;

[0079] Polyurethane modified acrylic resin 4: QDSRAYS UV090, nine functional groups, provided by Sidon New Materials;

[0080] Photoinitiator 1: Hydroxycyclohexanephenyl ketone, 184, supplied by BASF;

[0081] Photoinitiator 2: 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1173, supplied by BASF;

[0082] Photoinitiator 3: 2,4,6-trimethylbenzoyl diphenylphosphine oxide, TPO, supplied by BASF;

[0083] Leveling agent: Glide4100, a silicone twin structure surfactant, supplied by DIG;

[0084] pH adjuster: Dimethylethanolamine (DMEA), supplied by BASF;

[0085] Cosolvent: Diethylene glycol methyl ether, commercially available;

[0086] Thickener: Nonionic polyurethane, Pur44, provided by Mingling;

[0087] Matting agent: Polymethyl urea resin, M6, provided by Yabo Qiu Bo.

[0088] Example 1

[0089] This invention provides a white pigment paste, the components (parts by mass) of which are shown in Table 1;

[0090] Table 1

[0091]

[0092] The preparation method of the white pigment 1 is as follows:

[0093] (1) Add PVP-1 to a portion of water (77% of the total water mass), start the disperser and adjust the speed to 600 r / min, and dissolve it at a constant temperature of 50℃ until there are no obvious particles.

[0094] (2) Add wetting agent, cosolvent, coupling agent, defoamer and titanium dioxide 1 to the solution obtained in step (1) in sequence, and adjust the speed of the disperser to 1400 r / min, disperse at room temperature for 30 min until the slurry is uniform;

[0095] (3) Reduce the speed of the disperser to 1000 r / min, add the anti-settling agent and the remaining water to the above slurry, and continue to disperse at room temperature for 15 min;

[0096] (4) Grind the above dispersed slurry until the average particle size is ≤30μm to obtain color paste 1.

[0097] The preparation method of color paste 2-14 is the same as that of color paste 1. If the relevant components are not available, they can be omitted.

[0098] Examples 2-15 and Comparative Examples 1-9

[0099] Examples 2-15 and Comparative Examples 1-9 of this invention provide a water-based coating, the components (mass percentage) of which are shown in Tables 2-4;

[0100] Table 2

[0101]

[0102] Table 3

[0103]

[0104]

[0105] Table 4

[0106]

[0107]

[0108] The preparation method of the water-based coating provided in Example 2 is as follows: the components are mixed evenly to obtain the water-based coating.

[0109] The preparation methods of the waterborne coatings in Examples 3-15 and Comparative Examples 1-9 are consistent with those in Example 2.

[0110] Comparative Example 10

[0111] The present invention provides a water-based coating in comparative example, the only difference from Example 2 being the use of commercially available white pigment (provided by Shandong Wenqi New Materials) instead of white pigment.

[0112] Example 1

[0113] The storage stability of white pigments 1-14 was verified by the example of the present invention. Specifically, the pigments were placed at 50°C for 7 days and the sedimentation phenomenon was observed by the naked eye. The observation results are shown in Table 5.

[0114] Table 5

[0115] Storage stability Storage stability White pigment 1 No settlement White pigment 10 Severe subsidence White pigment 2 No settlement White pigment 11 Severe subsidence White pigment 3 No settlement White pigment 12 Severe subsidence White pigment 4 No settlement White pigment 13 No settlement White pigment 5 No settlement White pigment 14 Severe subsidence White pigment 6 No settlement White pigment 7 No settlement White pigment 8 No settlement White pigment 9 No settlement

[0116] As can be seen from Table 5, the white pigment prepared using the technical solution of this invention has excellent storage stability.

[0117] When polyvinylpyrrolidone is not added to white pigment, or when other substances are used to replace polyvinylpyrrolidone, the resulting white pigment has poor storage stability and will exhibit severe sedimentation. When too much titanium dioxide is added to the white pigment, the storage stability of the white pigment will also be reduced.

[0118] Example 2

[0119] The performance of the water-based coatings prepared in Examples 2-15 and Comparative Examples 1-10 was verified by the following examples: the prepared water-based coatings were sprayed onto the surface of a substrate (Biaogeda ABS test board), baked at 60°C for 10 minutes to remove moisture from the coatings, and then subjected to a test at 700 mJ / cm². 2The film was cured under ultraviolet light, and the resulting coating thickness was 25 μm. The coating thickness was tested by attaching a film thickness sheet to a plastic substrate, measuring the cured coating thickness with a micrometer, and subtracting the thickness of the blank film thickness to obtain the coating thickness. Next, corresponding performance tests were conducted, including the following aspects:

[0120] 1. Hardness: Determined according to GB / T 6739 2006;

[0121] 2. Gloss / GU: The gloss at 60° was tested using a BGD 516 / 1 gloss meter;

[0122] 3. Adhesion: Tested according to GB / T9286 1998;

[0123] 4. Scratch resistance: Scratch the surface 10 times in the same direction with a hard object. If there are no obvious scratches, it is considered no scratch. If there are 1-2 scratches, it is considered a minor scratch. If there are 3-5 scratches, it is considered a deeper scratch. If there are more than 5 scratches, it is considered a severe scratch.

[0124] 5. Stain resistance: Tested according to GB / T 1761-1979;

[0125] 6. UV resistance: Tested according to GB / T 16422.3. Use a colorimeter to measure the b value of the sample before and after the test, and record the change value. If 0 ≤ change value < 0.3, there is no yellowing; if 0.3 ≤ change value < 0.8, there is slight yellowing; if 0.8 ≤ change value < 1.3, there is deep yellowing; if the change value ≥ 1.3, there is severe yellowing.

[0126] 7. Solvent resistance: Tested by wiping with ethanol;

[0127] 8. Appearance: Visual inspection was used, and the observation results were recorded;

[0128] The results are shown in Table 6.

[0129] Table 6

[0130]

[0131]

[0132] As can be seen from Table 6, when the technical solution of the present invention is adopted, the coating formed by the water-based coating has good hardness, gloss, adhesion, scratch resistance, stain resistance, UV aging resistance, solvent resistance and appearance. Specifically, the hardness of the obtained coating is 2H, 3H or 4H, the gloss is above 19, the adhesion is grade 0 or 3, the b value change in the UV aging test is below 0.3, that is, there is no yellowing; the number of ethanol resistance cycles is >300, and the appearance does not show roughness or particle phenomenon.

[0133] As can be seen from Examples 2 and Comparative Examples 1-2, when the functionality of the polyurethane-modified acrylic resin used is outside the scope of this invention, the resulting product has a rough surface and poor UV aging resistance. As can be seen from Examples 2 and Comparative Examples 3, when the amount of white pigment added is too small, the resulting product has poor solvent resistance and yellowing resistance. As can be seen from Examples 2 and Comparative Examples 4, when the amount of white pigment added is too large, the resulting product has poor curing and poor appearance, and its scratch resistance, solvent resistance, and UV aging resistance are all significantly worse.

[0134] As can be seen from Examples 2, 8-15, and Comparative Examples 5-9, the choice of white pigment affects the performance of the product. When polyvinylpyrrolidone was not added to the white pigment in Comparative Example 5, the resulting coating had a poor appearance, and its solvent resistance, scratch resistance, stain resistance, and UV aging resistance were all significantly worse. When the average molecular weight of the polyvinylpyrrolidone used in the white pigment in Comparative Example 6 was too low, the resulting coating had low hardness, and the product's solvent resistance, scratch resistance, stain resistance, and UV aging resistance were all significantly worse. When polyethylene glycol was used to replace polyvinylpyrrolidone in the white pigment in Example 7, the resulting coating had poor appearance and performance, and the product's solvent resistance, scratch resistance, stain resistance, and UV aging resistance were significantly worse. When the amount of titanium dioxide added to the white pigment in Example 8 was too low, the resulting coating had poor UV aging resistance, solvent resistance, scratch resistance, and hardness. When the amount of titanium dioxide added to the white pigment in Example 9 was too high, the resulting coating had poor curing, a rough surface, and decreased scratch resistance, stain resistance, and UV aging resistance.

[0135] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A water-based coating, characterized in that, The water-based coating comprises the following components by mass percentage: 60-70% polyurethane modified acrylic resin, 2-5% photoinitiator, 0.5-0.7% leveling agent, 2% pH adjuster, 2-5% cosolvent, 0.5-0.6% thickener, 15-20% white pigment, 3-4% matting agent, balance water; The polyurethane-modified acrylic resin is a tetrafunctional polyurethane-modified acrylic resin or a hexafunctional polyurethane-modified acrylic resin. The white pigment paste comprises the following components in parts by weight: 0.5-1 parts polyvinylpyrrolidone, 0.6-2 parts wetting agent, 1-3 parts cosolvent, 0.5-1 parts coupling agent, 0.2-0.4 parts defoamer, 60-80 parts titanium dioxide, 1-2 parts anti-settling agent, and 13-20 parts water; The average molecular weight of the polyvinylpyrrolidone is 38,000-44,000.

2. The water-based coating according to claim 1, characterized in that, The mass ratio of polyvinylpyrrolidone to titanium dioxide is (0.5-0.8):(60-70).

3. The water-based coating according to claim 1, characterized in that, At least one of the following (a)-(h): (a) The wetting agent includes at least one of organosilicon acrylate, polyether-modified polysiloxane, ethoxylated unsaturated fatty acid monoethanolamide, and polyphosphate; (b) The cosolvent includes at least one of ethylene glycol, diethylene glycol, ethylene glycol butyl ether, and propylene glycol methyl ether; (c) The coupling agent includes at least one of siloxane coupling agents and titanate coupling agents; (d) The defoamer includes at least one of nonionic alkyne, polyether-modified polysiloxane, mineral oil emulsion, and acrylic emulsion; (e) The anti-settling agent includes at least one of organic bentonite, polyamide wax, and titanate coupling agent; (f) The titanium dioxide includes nano-titanium dioxide.

4. The water-based coating according to claim 1, characterized in that, The titanium dioxide includes at least one of rutile titanium dioxide and anatase titanium dioxide.

5. The water-based coating according to claim 1, characterized in that, The average particle size of the white pigment is ≤30μm.

6. The water-based coating according to claim 1, characterized in that, The preparation method of the white pigment paste includes the following steps: (1) Mix and disperse polyvinylpyrrolidone with some water, then heat to dissolve, to obtain an aqueous solution of polyvinylpyrrolidone; (2) Wetting agent, cosolvent, coupling agent, defoamer and titanium dioxide were added to the polyvinylpyrrolidone aqueous solution in sequence, and then stirred and dispersed at room temperature; (3) Next, add the anti-settling agent and the remaining water and continue stirring to disperse; (4) After dispersion, grind to obtain a white paste.

7. The water-based coating according to claim 1, characterized in that, The mass ratio of the polyurethane-modified acrylic resin to the white pigment is 60:(10-30).

8. The water-based coating according to claim 1, characterized in that, At least one of the following (g)-(l): (g) The photoinitiator comprises at least one of 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, 2-hydroxy-2-methylphenylpropanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; (h) The leveling agent includes at least one of an organosilicon surfactant and a fluorinated surfactant polymer; (i) The pH adjuster includes at least one of triethanolamine, methyldiethanolamine, AMP-95, and ethanolamine phosphate; (j) The cosolvent includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, and anti-whitening agent; (k) The thickener includes at least one of carboxymethyl cellulose, hydroxyethyl cellulose, guar gum, polyacrylamide, and polyethylene wax; (l) The matting powder includes at least one of ultrafine silica, talc, calcium stearate, and polyethylene wax.

9. The application of the water-based coating as described in any one of claims 1-8 in the preparation of wood-like components.

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