A water-based roll-coatable heat transferable woodware coating, its preparation method and use

Abstract

The application discloses a water-based roll-coating heat transfer printing woodware paint and a preparation method and application thereof, and comprises the following components in mass fraction: 55-75% of self-crosslinking water-based acrylic resin, 10-20% of water-based modified resin, 5-10% of water-based thickening resin, 0.2-1% of defoaming agent, 0.2-1% of base wetting agent, 0.5-3% of wetting dispersant, 3-6% of film forming aid, 1-5% of anti-scratch aid, 0.2-1% of leveling agent, 2-10% of deionized water, 0.1-0.5% of anti-sedimentation aid and 0-22% of other materials. The water-based roll-coating heat transfer printing woodware paint can balance the product hardness, roll-coating oil amount, roll-coating leveling property, heat transfer printing adhesion, anti-scratch and roll-coating construction performance, the heat transfer printing adhesion is less than 1 grade, the roll mark is light, the paint film is full and the hand feeling is good.

Description

Technical Field

[0001] This application belongs to the field of water-based wood coatings, specifically relating to a water-based roller-coated heat-transferable wood coating, its preparation method, and its application. Background Technology

[0002] Water-based wood coatings have been developing in China for over 20 years. Compared to oil-based wood coatings, they offer unparalleled advantages in energy conservation, environmental protection, safety, and employee health, leading to significant growth in recent years. Particularly in industries such as children's toys, water-based wood coatings have completely replaced oil-based ones due to the industry's characteristics, making it one of the most successful sub-sectors in the transition from oil-based to water-based wood coatings.

[0003] Children's toy paint is characterized by its environmental friendliness, with extremely high limits on harmful substances such as polycyclic aromatic hydrocarbons, phthalates, and harmful heavy metals in the paint. In addition, the paint must be bright and diverse in color to meet children's visual needs.

[0004] In the painting process of children's toys, the patterns and designs on the toys are generally achieved by first applying a primer and topcoat by roller coating or spraying, then screen printing for simple patterns, and heat transfer for complex patterns. The application of heat transfer involves the adhesion between the topcoat and the heat transfer film. A heat-transferable topcoat must ensure the pattern remains intact after demolding and exhibit excellent adhesion to the heat-transfer pattern. Research shows that the application process of the heat-transferable topcoat, the surface smoothness of the paint film, and the properties of the topcoat itself all affect the adhesion between the heat-transferable topcoat and the heat transfer film. When conventional wood topcoats are applied to heat transfer roller coating, uneven roller coating, heavy roller marks, low paint coverage, poor hiding power, poor adhesion after heat transfer, and incomplete demolding of the pattern. Some white topcoats have low surface tension after roller coating, resulting in defects such as the inability to adhere the heat-transfer pattern.

[0005] Furthermore, conventional application methods for children's toy coatings, such as spraying or roller coating, offer advantages. Spray coatings are simple to apply, have good leveling properties, and exhibit good adhesion to heat transfer films. Water-based roller coatings, while economical in paint and suitable for large-area flat surface applications, have relatively poor leveling properties and may leave roller marks, resulting in significantly weaker adhesion during heat transfer. To address this issue, optimization of the roller leveling properties, paint application amount, and resin selection for water-based roller-coated heat transfer coatings is necessary to achieve satisfactory heat transfer adhesion.

[0006] Some companies have researched water-based roller-coated heat transfer coatings, which use low-crosslinked acrylic resins combined with high-shear thickeners to create roller-coated heat transfer coatings. This method offers limited improvement in the high-shear viscosity of the coating, resulting in low roller-coating transfer rates and poor roller-coating leveling, which severely affects heat transfer adhesion. To address this issue, methods such as increasing the number of roller coating applications and using softer acrylic resins are typically employed. However, this increases energy and labor costs, and the heat transfer adhesion remains unstable.

[0007] Patent document CN112646443A discloses a heat transfer roller coating composition for wood coatings and its preparation method. The roller-coated white topcoat is composed of the following parts by weight: emulsion 30-90, dispersant 0.5-3.5, wetting agent 10.05-0.4, titanium dioxide 10-35, defoamer 10.1-0.8, defoamer 0.05-0.3, pH adjuster 0.05-0.3, wetting agent 0.1-0.8, film-forming aid 1-8, co-solvent 1-5, water 1.5-12, in-can preservative 0.05-0.4, paint film mildew inhibitor 0.05-0.4, thickener 1-7, and diluent 0.1-0.8; the emulsion is a self-crosslinking acrylic emulsion (NeoCreyl). The thickener is one or more of the following: XK-12, waterborne polyurethane dispersion (NeoCreyl 2180), and polyether polyol associative rheology modifier or Newtonian polyurethane thickener. However, the method described in this literature uses a traditional acrylic emulsion combined with a high-shear waterborne thickener to achieve roller coating. This method is similar to Comparative Example 1 of this invention, resulting in low oil application during roller coating. As customers' requirements for the surface finish and heat transfer performance of children's toys increase, this type of roller coating can no longer meet the current needs of the children's toy coating market. Furthermore, the self-crosslinking acrylic emulsion NeoCreyl XK-12 used has an excessively high crosslinking density. After application, as the storage time increases, the coating further self-crosslinks, and the heat transfer performance will severely decline, failing to meet the requirements.

[0008] Patent document CN112029332A discloses a water-based antibacterial coating and its preparation method, comprising the following components: 50 parts of water-based emulsion; 20-34 parts of flower-shaped nano-titanium dioxide-acrylic resin composite particles; 1-4 parts of film-forming aid; 1-6 parts of water-based additives; 1-4 parts of water-based color paste; 2-50 parts of deionized water; the water-based emulsion is at least one of acrylate emulsion, silicone-acrylic emulsion, styrene-acrylate emulsion, polyurethane dispersion, etc.; the thickener is at least one of alkali-swelling thickener, polyurethane associative thickener, or hydroxyethyl cellulose; the flower-shaped nano-titanium dioxide-acrylic resin composite particles are a "core-shell" structure with silane-modified flower-shaped nano-titanium dioxide as the core layer and organosilicon-modified acrylic polymer as the shell layer. However, the flower-shaped nano-titanium dioxide-acrylic resin composite particles described in this literature are complex and costly to produce, and their water-based coatings have significantly low high-shear viscosity, making them suitable only for spraying. When applied by roller, the coating transfer rate is extremely low, resulting in no paint film and negligible performance in terms of feel, leveling, fullness, and heat transfer properties. Roller-coated heat transfer coatings are a type of coating that combines coating performance and application properties; roller application properties have a significant impact on the coating's heat transfer performance, fullness, and rapid stacking. Summary of the Invention

[0009] The purpose of this invention is to provide a water-based roller-coated heat-transfer wood coating, its preparation method, and its application. This coating exhibits good heat transfer adhesion during roller coating application, thus solving the technical problems of insufficient oil content, poor roller leveling, heavy roller marks, and poor heat transfer adhesion in the application of water-based roller-coated wood coatings to children's toys, panel furniture, etc. It also overcomes the shortcomings of ordinary water-based single-component roller-coated heat-transfer wood coatings, such as poor heat transfer adhesion and low gloss.

[0010] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0011] The present invention discloses a water-based roller-coated heat-transfer wood coating comprising the following components by mass fraction: 55%–75% self-crosslinking water-based acrylic resin, 10%–20% water-based modified resin, 5%–10% water-based thickening resin, 0.2%–1% defoamer, 0.2%–1% substrate wetting agent, 0.5%–3% wetting and dispersing agent, 3%–6% film-forming aid, 1%–5% scratch-resistant aid, 0.2%–1% leveling agent, 2%–10% deionized water, 0.1%–0.5% anti-settling aid, and 0%–22% other materials;

[0012] The waterborne self-crosslinking acrylic resin is an anionic, single-component, waterborne acrylic copolymer emulsion with a number-average molecular weight of 200,000 to 1,000,000, a glass transition temperature of 18 to 23°C (preferably 21°C), and a minimum film-forming temperature of 0°C. Its viscosity at 23°C is 400 to 1200 mPa·s, and its pH value is 8-9. For example, COPCRYL 8713B produced by LianGu New Materials has a moderate self-crosslinking density, excellent gloss and transparency, as well as excellent water resistance and anti-tack properties, thus balancing the physicochemical properties and thermal transfer performance of the coating.

[0013] Resins with different glass transition temperatures and self-crosslinking densities have a significant impact on heat transfer adhesion and product application performance. Resins with excessively high glass transition temperatures and crosslinking densities will result in an overly hard film with excessively high surface crosslinking, making it difficult to achieve thermal adhesion with the heat transfer film and severely affecting the heat transfer adhesion of the roller-coated film. Furthermore, the adhesion will deteriorate over time. While resins with low glass transition temperatures and low crosslinking densities have a positive impact on heat transfer adhesion, they will have a significant negative impact on the product's water resistance and anti-retack properties. Therefore, a suitable glass transition temperature and self-crosslinking density of the main film-forming material are one of the keys to designing waterborne roller-coated heat transfer coatings. The waterborne acrylic resin of this invention has a suitable glass transition temperature and crosslinking density, which provides better heat transfer performance compared to other waterborne acrylic resins, ensuring excellent heat transfer adhesion even with a smooth coating.

[0014] The waterborne modified resin is at least one of a non-film-forming rigid styrene-acrylic copolymer emulsion with a glass transition temperature of 105–125°C (preferably 108°C) or / and a waterborne self-crosslinking polyurethane modified acrylic emulsion with a glass transition temperature of 100–105°C (preferably 102°C). The non-film-forming rigid styrene-acrylic copolymer emulsion, for example, is COPCRYL 8725B produced by LianGu New Materials, used in waterborne varnishes and printing inks. It possesses excellent gloss and transparency, as well as excellent water resistance and anti-tack properties. It has good compatibility with commercially available acrylic polymers. However, it cannot form a film alone and must be used with suitable film-forming aids or mixed with film-forming acrylic emulsions with smaller particle sizes. The waterborne self-crosslinking polyurethane modified acrylic emulsion, for example, is Uacryl 5298 produced by LianGu New Materials, a waterborne rigid resin used in waterborne varnishes to provide anti-blocking properties to the system.

[0015] The water-based thickening resin is a styrene-acrylic solid resin aqueous solution with a number average molecular weight of 5500-6500 and a viscosity of 20000-25000 mPa·s at 25°C, produced by heating and dissolving styrene-acrylic copolymer, water, and dipropylene glycol monobutyl ether as raw materials under the promotion of ammonia; for example, the B2067 water-based thickening resin produced by Zhancheng New Materials. Compared with the water-based polyurethane high-shear thickeners used in traditional water-based coatings, the B2067 water-based thickening resin itself is an excellent film-forming substance with excellent sealing and adhesive properties, as well as water and alkali resistance. It can associate with the main film-forming material, and its high viscosity provides the coating's application viscosity, significantly improving the coating transfer rate and oil coverage, effectively reducing roller marks on the paint film, and improving the fullness, gloss, and smoothness of the paint film, thereby improving the heat transfer adhesion of the paint film.

[0016] The water-based thickening resin can also be prepared by a method including the following steps: 38%–45% by mass of deionized water, 3%–7% by mass of dipropylene glycol monobutyl ether, and 3%–7% by mass of ethanol are mixed evenly to obtain a mixed solvent; 42%–48% of a styrene-acrylic acid copolymer (such as Hanwha Corporation's solid resin Soluryl 60L, with a glass transition temperature of 70°C and a softening point of 80°C) is dispersed in the mixed solvent, and then 1%–5% of ammonia water is added. The mixture is gradually heated to 80±5°C under stirring and dispersed and dissolved for 2–5 hours; the mixture is then slowly cooled to room temperature to obtain a transparent water-based thickening resin.

[0017] Preferably, the defoamer is at least one of polyether siloxane copolymer defoamers (e.g., Evonik Specialty Chemicals TEGOFoamex 810, TEGOAirex 902W).

[0018] Preferably, the substrate wetting agent is at least one of polyether-modified polydimethylsiloxane (e.g., BYK 346 from BYK Chemicals) and / or organosilicon twin structure surfactant (e.g., Evonik Specialty Chemicals TEGO Twin 4100), used to promote rapid surface wetting and penetration of the coating onto the substrate, reducing coating defects.

[0019] Preferably, the wetting and dispersing agent is at least one of a high molecular weight block copolymer solution containing pigment affinity groups (e.g., BYK Disperbyk 190) or / and an aqueous solution of a copolymer containing pigment adsorption groups (e.g., Evonik Specialty Chemicals TEGO Dispers 755W), which plays a role in wetting, dispersing and stabilizing pigments and fillers.

[0020] Preferably, the film-forming aid is dipropylene glycol monomethyl ether or / and dipropylene glycol butyl ether, which can promote emulsion film formation and reduce the risk of coating cracking.

[0021] Preferably, the anti-scratch agent is at least one of water-based polyethylene wax emulsion (e.g., BYK Aquacer 513) and modified polyethylene micronized wax (e.g., BYK CERAFLOUR 929N), which provides scratch resistance, hardness, and a good hand feel in the coating film. The scratch resistance is optimal when the amount of anti-scratch agent added is 4% of Aquacer 513 or 1% to 2% of CERAFLOUR 929N.

[0022] Preferably, the leveling agent is a polyether-modified polydimethylsiloxane solution or / and an acrylic polymer leveling agent, such as BYK333 from BYK Chemicals or TEGO 450 from Evonik Specialty Chemicals. This promotes coating flow and leveling, and reduces roller marks and bubbles on loose substrates. In this system, the leveling agent has the best effect in reducing roller marks and bubbles on loose substrates when the amount added is 0.5%.

[0023] Preferably, the anti-settling agent is a modified urea solution and / or a special modified polyamide solution, such as BYK7420ES (modified urea solution) or DISPARLONAQH800 (special modified polyamide), and the preferred dosage of the anti-settling agent is 0.1%.

[0024] Preferably, the other materials are at least one of pigments, matting agents, antioxidants, and anti-yellowing agents, which can further improve the performance of water-based wood coatings.

[0025] More preferably, the pigment is rutile titanium dioxide, such as CR510 titanium dioxide from Jinzhou Titanium Industry, which provides hiding power and whiteness to the coating film; the matting agent is silica matting powder, such as SYLOID 7000 (silica matting powder) from Grace Chemicals, which adjusts the gloss of the coating film; the amount of matting agent added is 0-3%.

[0026] The present invention discloses a method for preparing a water-based roller-coated heat-transfer wood coating, comprising the following steps: S1, mixing the self-crosslinking water-based acrylic resin and water-based modified resin evenly, then adding the defoamer, substrate wetting agent, and wetting and dispersing agent, and stirring and mixing evenly to obtain a first mixture; S2, adding an anti-settling agent, other materials, and part of the water-based thickening resin to the first mixture, and stirring and mixing evenly to obtain a second mixture; S3, adding the film-forming aid and part of deionized water to the second mixture, and stirring and mixing evenly to obtain a third mixture; S4, adding the anti-scratch aid and leveling agent to the third mixture, and stirring and mixing evenly to obtain a fourth mixture; S5, adding the remaining deionized water and water-based thickening resin to the fourth mixture to adjust the viscosity, thereby obtaining the water-based roller-coated heat-transfer wood coating.

[0027] Preferably, the stirring speed in step S1 is 600-800 r / min; the stirring speed in step S2 is 1000-1500 r / min, and the stirring time is 25-35 min; the stirring speed in steps S3-S5 is 600-800 r / min.

[0028] Preferably, the fineness of the second mixture is ≤25μm, which can reduce pinholes in water-based roller-coated heat-transfer wood coatings after film formation.

[0029] The present invention discloses a water-based roller-coated heat-transferable wood coating, which is applied to the roller coating of wooden children's toys, boards, wooden panel furniture and / or wooden packaging products to form a topcoat coating; the topcoat coating has excellent heat transfer adhesion and its surface can be used for heat transfer application.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] In the formulation of this invention, a self-crosslinking waterborne acrylic resin with a specific glass transition temperature and self-crosslinking density is selected as the main film-forming substance, and compounded with a hard and tough waterborne modified resin. This gives the coating film both moderate film hardness and excellent heat transfer performance, as well as a certain degree of anti-sticking and flexibility, ensuring that the film does not crack, making it suitable for large-scale mechanical roller coating. Furthermore, a waterborne thickening resin is used for thickening. Through its own high viscosity and the associative thickening effect with the main resin, it increases the high shear viscosity for roller coating, providing the necessary application viscosity, which can significantly improve the paint transfer rate and leveling properties during roller coating. Compared with conventional waterborne polyurethane thickeners, under the same roller coating conditions, the waterborne thickening resin of this invention can provide higher film fullness and better roller coating leveling properties, ensuring a smooth paint surface. This ensures effective contact between the transfer film and the paint surface during heat transfer, thereby improving heat transfer adhesion and overall coating effect.

[0032] The water-based roller-coated heat-transfer wood coating of this invention can balance the properties of product hardness, roller coating oil content, roller coating leveling, heat transfer adhesion, scratch resistance, and roller coating workability. The heat transfer adhesion is less than level 1, the roller marks are light, the paint film is full, and the hand feel is good. The product performance meets the requirements of GB / T23999-2009. It is particularly suitable for roller coating and pattern heat transfer construction of children's toys and panel furniture. Moreover, it meets the requirements of GB18581-2020 in terms of VOC content, formaldehyde content, total lead and soluble heavy metals, total content of ethylene glycol ether or ether ester, total content of benzene series compounds, and APEO content. The polycyclic aromatic hydrocarbon content can reach the Class I requirements, which meets the national standard general requirements for children's toy paint. Detailed Implementation

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be noted that the embodiments of this invention are merely illustrative of the content of this application and do not constitute a limitation on the technical solutions of this application.

[0034] Examples 1-3 and Comparative Examples 1-2

[0035] The mass fractions of raw materials and components of the water-based roller-coated heat-transferable clear coatings of Examples 1-3 and the water-based wood anti-indentation coatings of Comparative Examples 1-2 are listed in Table 1. The preparation methods include the following steps:

[0036] S1, self-crosslinking waterborne acrylic resin and waterborne modified resin are stirred into a dispersion tank and mixed evenly. Then, defoamer, substrate wetting agent and wetting and dispersing agent are added to it. Stir and disperse at 600 r / min for 15 min and mix evenly to obtain the first mixture.

[0037] S2, add anti-settling agent, other materials and part of water-based thickening resin to the first mixture, stir and disperse at 1200 r / min for 35 min to make the fineness ≤25um, and mix evenly to obtain the second mixture;

[0038] S3, after mixing the film-forming aid and part of the deionized water, slowly add it to the second mixture while stirring at a speed of 700 r / min, and stir and disperse for 12 min to obtain the third mixture;

[0039] S4, add anti-scratch agent and leveling agent to the third mixture while stirring at 700 r / min, and stir until uniform to obtain the fourth mixture;

[0040] S5. Add the remaining deionized water and water-based thickening resin to the fourth mixture to adjust the viscosity, and obtain a water-based roller-coated heat-transfer wood coating.

[0041] Table 1. Mass fractions of raw materials and components in Examples 1-3 and Comparative Examples 1-2, in %

[0042]

[0043]

[0044] Comparative Example 1 is a comparative example of Example 3, the difference being that Comparative Example 1 uses the water-based thickener RHEOLATE 212, a non-ionic associative rheology modifier.

[0045] Comparative Example 2 is a comparative example of Example 3, except that Comparative Example 2 uses 3 parts of Zhancheng New Material B2067 water-based thickener resin and 2 parts of water-based thickener Deqian Hemings RHEOLATE 212 nonionic associative rheology modifier.

[0046] Test Experiment Example

[0047] The water-based roller-coated heat-transferable clear coatings of Examples 1-3 and the water-based roller-coated heat-transferable clear coatings of Comparative Examples 1-2 were tested according to GB / T23999-2009, GB18581-2020, roller coating mechanical construction and heat transfer construction methods. The test results are shown in Table 2. The roller coating construction test conditions are as follows: cherry wood veneer board - roller coating of water-based roller-coated clear primer (3 rollers) - drying: 60-70℃ / 15s - roller coating of water-based roller-coated clear primer (2 rollers) - drying: 60-70℃ / 15s - roller coating of water-based roller-coated clear topcoat (3 rollers) - drying: 60-70℃ / 60s + air cooling / 60s - heat transfer construction.

[0048] Table 2 Performance test results of Examples 1-3 and Comparative Examples 1-2

[0049]

[0050]

[0051]

[0052] As shown in Table 2, the water-based roller-coated heat transfer clear coatings of Examples 1-3 used COPCRYL 8713B with a glass transition temperature of 21°C and a suitable crosslinking density as the main resin, and were compounded with Uacryl, a water-based modified resin with a glass transition temperature of 102°C. 5298 improves upon the deficiencies in hardness and anti-blocking properties of the base resin while maintaining its heat transfer performance, thus enhancing the overall performance of water-based roller-coated heat transfer coatings. The use of water-based thickening resin B2067 significantly increases the high shear viscosity of the coating, improving roller coating coverage. Under roller coating conditions, roller coating workability is significantly improved, with less roller marks, better scratch resistance, better anti-blocking of workpieces after stacking, and excellent heat transfer adhesion, all demonstrating good heat transfer performance. Other properties such as hardness, scratch resistance, and chemical resistance also fully meet the requirements of general water-based wood coatings. Moreover, the product performance complies with the requirements of two standards: GB18581-2020 Limits of Hazardous Substances in Wood Coatings and GB / T23999-2009 Water-based Wood Coatings for Interior Decoration.

[0053] It can also be seen that in Examples 1 and 2, as the amount of water-based modified resin Uacryl 5298 decreases, the hardness of the paint film and the anti-blocking properties of the offline stack also decrease. In Example 3, reducing the amount of water-based thickening resin will decrease the viscosity, and the amount of oil applied by the roller will decrease as the amount of water-based thickening resin decreases.

[0054] As can be seen from the comparison between Example 3 and Comparative Examples 1-2, water-based thickening resin B2067 is a water-soluble high-viscosity thickening resin. Unlike ordinary water-based polyurethane associative thickeners that increase system viscosity through association, its high viscosity and high solids content resin system can bring extremely high shear viscosity to the coating of the present invention, thereby improving the coating transfer rate of roller coating. Compared with the coating system using ordinary water-based polyurethane associative thickeners, the roller coating transfer rate of the coating of the present invention can be increased by nearly 2 times. The high oil content brings high fullness of the paint film, good leveling properties, and light roller marks. A smooth paint film with light roller marks can ensure that the transfer film can effectively contact the paint surface during heat transfer construction, which is a necessary condition for good heat transfer adhesion.

Claims

1. A water-based roller-coated heat-transfer wood coating, characterized in that, The product comprises the following components by mass fraction: 55%–75% self-crosslinking waterborne acrylic resin, 10%–20% waterborne modified resin, 5%–10% waterborne thickening resin, 0.2%–1% defoamer, 0.2%–1% substrate wetting agent, 0.5%–3% wetting and dispersing agent, 3%–6% film-forming aid, 1%–5% anti-scratch aid, 0.2%–1% leveling agent, 2%–10% deionized water, 0.1%–0.5% anti-settling agent, and 0%–22% other materials. The self-crosslinking waterborne acrylic resin is an anionic single-component waterborne acrylic copolymer emulsion with a number average molecular weight of 200,000 to 1,000,000, a glass transition temperature of 18 to 23°C, a minimum film-forming temperature of 0°C, a viscosity of 400 to 1200 mPa.s at 23°C, and a pH value of 8 to 9. The waterborne modified resin is a non-film-forming rigid styrene-acrylic copolymer emulsion with a glass transition temperature of 105-125°C or / and a waterborne self-crosslinking polyurethane modified acrylic emulsion with a glass transition temperature of 100-105°C. The water-based thickening resin is an aqueous solution of styrene-acrylic acid solid resin with a number average molecular weight of 5500-6500 and a viscosity of 20000-25000 mPa·s at 25°C, produced by heating and dissolving styrene-acrylic acid copolymer, water, and dipropylene glycol monobutyl ether under the promotion of ammonia. The water-based thickening resin is prepared by the following steps: 38%-45% by mass of deionized water, 3%-7% by mass of dipropylene glycol monobutyl ether, and 3%-7% by mass of ethanol are mixed uniformly to obtain a mixed solvent; 42%-48% of the styrene-acrylic acid copolymer is dispersed in the mixed solvent, and then 1%-5% ammonia is added. The mixture is gradually heated to 80±5°C under stirring and dispersed for 2-5 hours; the mixture is then slowly cooled to room temperature to obtain a transparent water-based thickening resin. The other materials are at least one of pigments, matting agents, antioxidants, and anti-yellowing agents.

2. The water-based roller-coated heat-transfer wood coating according to claim 1, characterized in that, The defoamer is a polyether siloxane copolymer defoamer; the substrate wetting agent is a polyether-modified polydimethylsiloxane or / and an organosilicon twin structure surfactant; the wetting and dispersing agent is a high molecular weight block copolymer solution containing pigment affinity groups or / and an aqueous solution of a copolymer containing pigment adsorption groups.

3. The water-based roller-coated heat-transfer wood coating according to claim 1, characterized in that, The film-forming aid is dipropylene glycol monomethyl ether or / and dipropylene glycol butyl ether; the scratch-resistant aid is at least one of water-based polyethylene wax emulsion and modified polyethylene micronized wax; the leveling agent is polyether-modified polydimethylsiloxane solution or / and acrylic polymer leveling agent; the anti-settling aid is modified urea solution or / and special modified polyamide solution, wherein the special modified polyamide solution is DISPARLON AQH800.

4. The water-based roller-coated heat-transfer wood coating according to claim 1, characterized in that, The pigment is rutile titanium dioxide; the matting agent is silica matting powder; the amount of matting agent added is 0-3%.

5. The method for preparing water-based roller-coated heat-transfer wood coatings according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. After uniformly mixing the self-crosslinking waterborne acrylic resin and waterborne modified resin, add the defoamer, substrate wetting agent, and wetting and dispersing agent, and stir to mix evenly to obtain a first mixture; S2. Add the anti-settling agent, other materials, and part of the waterborne thickening resin to the first mixture, and stir to mix evenly to obtain a second mixture; S3. Add the film-forming aid and part of deionized water to the second mixture, and stir to mix evenly to obtain a third mixture; S4. Add the anti-scratch aid and leveling agent to the third mixture, and stir to mix evenly to obtain a fourth mixture; S5. Add the remaining deionized water and waterborne thickening resin to the fourth mixture to adjust the viscosity, and obtain the waterborne roller-coated heat-transfer wood coating.

6. The method for preparing the water-based roller-coated heat-transfer wood coating according to claim 5, characterized in that, The stirring speed in step S1 is 600-800 r / min; the stirring speed in step S2 is 1000-1500 r / min, and the stirring time is 25-35 min; the stirring speed in steps S3-S5 is 600-800 r / min.

7. The method for preparing the water-based roller-coated heat-transfer wood coating according to claim 5, characterized in that, The fineness of the second mixture is ≤25μm.

8. The application of the water-based wood coatings according to any one of claims 1 to 4 in wooden children's toys, boards, wooden panel furniture and packaging products.

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