Water-based roller coating heat transfer printing wood coating as well as preparation method and application thereof

Abstract

The invention discloses a water-based roller coating heat transfer printing wood coating and a preparation method and application thereof. The water-based roller coating heat transfer printing wood coating is prepared from, by mass, 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 a defoaming agent, 0.2%-1% of a substrate wetting agent, 0.5%-3% of a wetting dispersant, 3%-6% of a coalescing agent, 1%-5% of a scratch-resistant additive, 0.2%-1% of a flatting agent, 2%-10% of deionized water, 0.1%-0.5% of an anti-settling additive and 0-22% of other materials. The water-based roller-coating heat-transfer-printing wood coating disclosed by the invention has the properties of product hardness, roller-coating oiling quantity, roller-coating leveling property, heat-transfer-printing adhesive force, scratch resistance, roller-coating constructability and the like, the heat-transfer-printing adhesive force is less than grade 1, roller marks are light, a paint film is full, and the hand feeling is good.

Description

Technical Field

[0001] The present application belongs to the field of water-based wood coatings, and specifically relates to a water-based roller-coated heat-transferable wood coating, a preparation method thereof, and an application thereof. Background Art

[0002] Water-based wood coatings have been developed in China for more than 20 years. Compared with oil-based wood coatings, water-based wood coatings have unparalleled advantages in energy saving, environmental protection, safety, and employee health. Therefore, water-based wood coatings have made great progress in recent years. Especially in the children's toys industry, due to the characteristics of the industry, the application of water-based wood coatings has completely replaced oil-based wood coatings, which is the most successful subdivision of oil-to-water conversion of wood coatings.

[0003] The characteristics of children's toy paint are environmental protection. It has extremely high requirements on the limit of harmful substances in the paint, such as polycyclic aromatic hydrocarbons, phthalates, harmful heavy metals, etc., and the paint must be brightly colored and diverse to suit children's perceptions.

[0004] In the process of painting children's toys, the patterns and designs on children's toys are generally first roller-coated or sprayed with primer and topcoat, and then the simple pattern is screen-printed, and the complex pattern is thermally transferred. The thermal transfer process involves the adhesion problem between the topcoat and the thermal transfer film. The thermal transfer topcoat must have a complete pattern after demolding and excellent adhesion to the thermal transfer pattern. According to research, the construction process of the thermal transfer topcoat, the surface flatness of the paint film, and the performance of the topcoat itself will affect the adhesion between the thermal transfer topcoat and the thermal transfer film. Conventional wood topcoat is used for thermal transfer roller coating construction, which will result in uneven roller coating, heavy roller marks, low paint application, poor hiding power, poor adhesion after thermal transfer testing, incomplete pattern demolding, and some white topcoats have low surface tension after roller coating, resulting in defects such as the inability to adhere to the thermal transfer pattern.

[0005] Moreover, the conventional construction methods of general children's toy paints are spraying or roller coating. Spraying paint is simple to apply, has good leveling, and has good adhesion to thermal transfer films. Water-based roller coating topcoat saves paint and is suitable for large-area flat plate construction, but its leveling is relatively poor and there will be roller marks, so its adhesion during thermal transfer is much worse. To solve this problem, it is necessary to optimize the roller leveling, roller oil amount, resin selection, etc. of water-based roller coating thermal transfer paint to achieve qualified thermal transfer adhesion.

[0006] Some companies have conducted research on water-based roller-coated thermal transfer coatings, which use low-crosslinked acrylic resins combined with high-shear thickeners to make roller-coated thermal transfer coatings. This method has limited improvement in the high-shear viscosity of the coating, low roller transfer rate, and poor roller leveling, which will seriously affect the thermal transfer adhesion. To solve this problem, it is generally solved by increasing the number of roller coating construction times and using softer acrylic resins, which will increase energy consumption, labor costs, and other costs, and the thermal transfer adhesion is unstable.

[0007] Patent document CN112646443A discloses a thermal transfer roller coating wood coating combination and a preparation method thereof, wherein the roller coating white topcoat is prepared from the following weight parts: 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, cosolvent 1-5, water 1.5-12, can preservative 0.05-0.4, paint film mildewproof agent 0.05-0.4, thickener 1-7, diluent 0.1-0.8; the emulsion is a self-crosslinking acrylic emulsion (NeoCreyl XK-12), aqueous polyurethane dispersion (NeoCreyl2180), and the thickener is one or more of polyether polyol associative rheological additive and Newtonian polyurethane thickener. However, the method of the document is to use a traditional acrylic emulsion with a high shear aqueous thickener to achieve the purpose of roller coating. This method is similar to Comparative Example 1 of the present invention. The amount of oil applied during roller coating is low. As customers have higher requirements for the surface effect and thermal transfer performance of children's toys, this type of roller coating technology can no longer meet the requirements of customers in the current children's toy coating market. In addition, the crosslinking density of the self-crosslinking acrylic emulsion NeoCreyl XK-12 used is too high. After the workpiece is constructed, as the storage time increases, the coating further self-crosslinks, and the thermal transfer performance will seriously decrease, which cannot meet the requirements.

[0008] Patent document CN112029332A discloses a water-based antibacterial coating and a preparation method thereof, comprising the following components: 50 parts of an aqueous emulsion; 20-34 parts of flower-shaped nano titanium dioxide-acrylic resin composite particles; 1-4 parts of a film-forming aid; 1-6 parts of an aqueous aid; 1-4 parts of an aqueous color paste; 2-50 parts of deionized water; the aqueous emulsion is at least one of an acrylic emulsion, a silicone-acrylic emulsion, a styrene-acrylate emulsion, a polyurethane dispersion, etc.; the thickener is at least one of an alkali-swellable thickener, a 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 a core layer and an organosilicon-modified acrylic polymer as a shell layer. However, the flower-shaped nano titanium dioxide-acrylic resin composite particles in the document are complex to produce and costly, and the high shear viscosity of the water-based coating is significantly low, which makes it only suitable for spraying. When roller coating is applied, the coating transfer rate is extremely low, and there will be no paint film, and there will be no talk of hand feel, leveling, fullness, thermal transfer performance, etc. Roller-coated thermal transfer coating is a coating variety that combines coating performance and construction performance. Roller coating construction has a huge impact on the thermal transfer performance, fullness, and rapid stacking of the coating. Summary of the invention

[0009] The purpose of the present invention is to provide a water-based roller-coated heat-transferable wood coating and a preparation method and application thereof. The coating is roller-coated and has good heat transfer adhesion, so as to solve the technical problems of insufficient oiling, poor roller leveling, heavy roller marks, poor heat transfer adhesion, etc. in roller coating construction of water-based wood coatings for children's toys, panel furniture, etc., and solve the shortcomings of poor heat transfer adhesion and low gloss of ordinary water-based single-component roller-coated heat transfer wood coatings.

[0010] In order to solve the above technical problems, the technical solution of the present invention is as follows:

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

[0012] The water-based self-crosslinking acrylic resin is an anionic single-component water-based 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), a minimum film-forming temperature of 0°C, a viscosity of 400 to 1200 mPa.s at 23°C, and a pH value of 8-9; for example, COPCRYL 8713B produced by Liangu New Materials, which has a moderate self-crosslinking density, excellent gloss and transparency, as well as excellent water resistance and anti-rebound performance, and can take into account the physical and chemical properties and thermal transfer performance of the coating;

[0013] Resins with different glass transition temperatures and self-crosslinking densities have a great influence on thermal transfer adhesion and product construction performance. Resins with too high glass transition temperatures and crosslinking densities will make the paint film too hard after film formation and the surface crosslinking is too high, making it difficult to thermally adhere to the thermal transfer film, seriously affecting the thermal transfer adhesion of the roller coating film, and the thermal transfer construction adhesion will become worse and worse over time; while resins with low glass transition temperatures and low crosslinking densities have a positive effect on thermal transfer adhesion, they will have a great negative impact on the physical properties of the product such as water resistance and anti-rebound, so the main film-forming material with appropriate glass transition temperatures and self-crosslinking densities is one of the keys to designing water-based roller thermal transfer coatings; the water-based acrylic resin of the present invention has appropriate glass transition temperatures and crosslinking densities, and can provide better thermal transfer performance than other water-based acrylic resins, ensuring excellent thermal transfer adhesion when the coating film is flat;

[0014] The water-based modified resin is at least one of a non-film-forming hard styrene-acrylic copolymer emulsion with a glass transition temperature of 105-125°C (preferably 108°C) or / and a water-based self-crosslinking polyurethane modified acrylic emulsion with a glass transition temperature of 100-105°C (preferably 102°C). The non-film-forming hard styrene-acrylic copolymer emulsion may be COPCRYL 8725B produced by Liangu New Materials, which is used for water-based varnish and printing ink, has excellent gloss and transparency, as well as excellent water resistance and anti-rebound performance. It has good compatibility with popular acrylic polymers on the market, and it cannot form a film alone. It must be used with a suitable film-forming aid or mixed with a film-forming acrylic emulsion with a smaller particle size; the water-based self-crosslinking polyurethane modified acrylic emulsion may be Uacryl 5298 produced by Liangu New Materials, which is a water-based hard resin used for water-based varnishes to provide anti-adhesion properties for 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 a heating dissolution process under the promotion of ammonia using styrene acrylic copolymer, water and dipropylene glycol monobutyl ether as raw materials; for example, the B2067 water-based thickening resin produced by Zhanchen New Materials. Compared with the water-based polyurethane high shear thickener used in traditional water-based coatings, the B2067 water-based thickening resin itself is an excellent film-forming substance with excellent sealing and bonding effects, and has water and alkali resistance. It can be associated with the main film-forming material, and use its own high viscosity to provide the construction viscosity of the coating, greatly improve the coating transfer rate and oiling amount, effectively reduce the roller mark of the paint film, and improve the fullness, gloss and flatness of the paint film, thereby improving the thermal transfer adhesion of the paint film.

[0016] The water-based thickening resin can also be prepared by a method comprising the following steps: 38% to 45% by mass of deionized water, 3% to 7% of dipropylene glycol monobutyl ether and 3% to 7% of ethanol are mixed uniformly to obtain a mixed solvent; 42% to 48% of a styrene acrylic copolymer (such as Hanwha'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 1% to 5% of ammonia water is added, and the temperature is gradually raised to 80±5°C under stirring, and the mixture is dispersed and dissolved for 2 to 5 hours; the temperature is slowly lowered to room temperature to obtain a transparent water-based thickening resin.

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

[0018] Preferably, the substrate wetting agent is at least one of polyether modified polydimethylsiloxane (e.g. BYK346 from BYK Chemical) and / or silicone twin structure surfactant (e.g. TEGO Twin 4100 from Evonik Specialty Chemicals), which is used to promote rapid surface wetting and penetration of the coating into the substrate and reduce 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 (for example: BYK Disperbyk 190) or / and a copolymer aqueous solution containing pigment adsorption groups (for example: Evonik Specialty Chemicals TEGO Dispers 755W), which plays a wetting, dispersing and stabilizing role on pigments and fillers.

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

[0021] Preferably, the anti-scratch additive is at least one of an aqueous polyethylene wax emulsion (e.g., BYK Aquacer 513) and a modified polyethylene micronized wax (e.g., BYK CERAFLOUR 929N), which provides scratch resistance, hardness and a good hand feel in the coating film. The anti-scratch performance is best when the addition amount of the anti-scratch additive is 4% Aquacer 513 or 1% to 2% 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 Chemical and TEGO 450 from Evonik Specialty Chemicals, which promotes the flow and leveling of the coating, reduces roller marks and bubbles on loose substrates, etc. In this system, when the addition amount of the leveling agent is 0.5%, the effect of reducing roller marks and bubbles on loose substrates is the best.

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

[0024] Preferably, the other materials are at least one of a pigment, a matting agent, an antioxidant, and an anti-yellowing agent, which can further improve the performance of the water-based wood coating.

[0025] More preferably, the pigment is rutile titanium dioxide, such as Jinzhou Titanium Industry CR510 titanium dioxide, which provides hiding power and whiteness for the coating; the matting agent is silica matting powder, such as American Grace SYLOID 7000 (silicon dioxide matting powder), which adjusts the glossiness of the coating; the addition amount of the matting agent is 0-3%.

[0026] The preparation method of a water-based roller-coated heat-transferable wood coating of the present invention comprises the following steps: S1, after the self-crosslinking water-based acrylic resin and the water-based modified resin are mixed evenly, the defoamer, the substrate wetting agent and the wetting dispersant are added thereto, and the mixture is stirred and mixed evenly to obtain a first mixture; S2, an anti-settling aid, other materials and a part of the water-based thickening resin are added to the first mixture, and the mixture is stirred and mixed evenly to obtain a second mixture; S3, the film-forming aid and a part of deionized water are added to the second mixture, and the mixture is stirred and mixed evenly to obtain a third mixture; S4, the anti-scratch aid and the leveling agent are added to the third mixture, and the mixture is stirred and mixed evenly to obtain a fourth mixture; S5, the remaining deionized water and the water-based thickening resin are added to the fourth mixture to adjust the viscosity, and the water-based roller-coated heat-transferable wood coating is obtained.

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

[0028] Preferably, the fineness of the second mixture is ≤25 μm, which can reduce the shrinkage holes after the water-based roller-coated heat-transferable wood coating is formed into a film.

[0029] The water-based roller-coated heat-transferable wood coating described in the present invention is used for 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 the characteristics of excellent heat transfer adhesion, and its surface can be heat-transfer constructed.

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

[0031] In the formula of the present invention, a self-crosslinking water-based acrylic resin with a specific glass transition temperature and self-crosslinking density is selected as the main film-forming substance, and a hard and tough water-based modified resin is compounded, so that the coating film has both moderate film hardness and excellent heat transfer performance, and has certain anti-stickiness and flexibility, ensuring that the paint film does not crack, so as to be suitable for large-scale mechanical roller coating construction; and then thickening is performed by a water-based thickening resin, which increases the roller coating high shear viscosity through its own high viscosity and the associative thickening effect with the main resin, provides construction viscosity, and can greatly improve the transfer rate and leveling of the roller coating coating. Compared with conventional water-based polyurethane thickeners, under the same roller coating construction, the water-based thickening resin of the present invention can provide a higher paint film fullness and good roller coating leveling, ensuring a flat paint surface, thereby ensuring effective contact between the transfer film and the paint surface during thermal transfer construction, thereby improving thermal transfer adhesion and the overall coating effect.

[0032] The water-based roller-coated thermal transfer wood coating of the present invention can take into account the performances such as product hardness, roller coating oil amount, roller coating leveling, thermal transfer adhesion, scratch resistance, roller coating construction performance, etc. The thermal transfer adhesion is less than level 1, the roller mark is light, the paint film is plump, and the hand feel is good. The product performance meets the requirements of GB / T23999-2009, and is particularly suitable for roller coating construction and pattern thermal transfer construction of children's toys, panel furniture, etc.; and 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 ethers or ether esters, total content of benzene series, APEO content requirements, etc., and the content of polycyclic aromatic hydrocarbons can reach Class I requirements, which meets the national standard requirements for general children's toy paints. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application is further described in detail in conjunction with the embodiments below. It should be noted that the embodiments of the present invention are only used to explain the contents of the present application and do not constitute a limitation on the technical solutions of the present application.

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

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

[0036] S1, stirring the self-crosslinking water-based acrylic resin and the water-based modified resin into a dispersion tank, after mixing evenly, adding a defoamer, a substrate wetting agent and a wetting dispersant thereto, stirring and dispersing at a speed of 600 r / min for 15 minutes, and mixing evenly to obtain a first mixture;

[0037] S2, adding an anti-settling aid, other materials and part of the water-based thickening resin to the first mixture, stirring and dispersing at a speed of 1200 r / min for 35 min to make the fineness ≤25 um, and mixing evenly to obtain a second mixture;

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

[0039] S4, adding an anti-scratch additive and a leveling agent to the third mixture at a stirring speed of 700 r / min, stirring and mixing to obtain a fourth mixture;

[0040] S5, adding the remaining deionized water and aqueous thickening resin to the fourth mixed material to adjust the viscosity, thereby obtaining an aqueous roller-coated heat-transferable wood coating.

[0041] Table 1 Mass fractions of raw materials and components of Examples 1 to 3 and Comparative Examples 1 to 2, unit %

[0042]

[0043]

[0044] Comparative Example 1 is a comparative example of Example 3, except that Comparative Example 1 uses a water-based thickener, Deqian Hemmings RHEOLATE 212 non-ionic associative rheological additive.

[0045] Comparative Example 2 is a comparative example of Example 3, except that Comparative Example 2 uses 3 parts of Zhanchen New Material B2067 water-based thickener resin and 2 parts of water-based thickener Deqian Hemmings RHEOLATE 212 non-ionic associative rheological additive.

[0046] Test experiment example

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

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

[0049]

[0050]

[0051]

[0052] As can be seen from Table 2, the water-based roller coating heat transfer clear coatings of Examples 1 to 3 use COPCRYL 8713B with a glass transition temperature of 21°C and a suitable crosslinking density as the main resin, and are compounded with a water-based modified resin Uacryl with a glass transition temperature of 102°C. 5298, while maintaining the thermal transfer performance of the main resin, improves the deficiencies of hardness and anti-adhesion of the main resin, and improves the comprehensive performance of water-based roller-coated thermal transfer coatings. The use of water-based thickening resin B2067 greatly improves the high shear viscosity of the coating, increases the amount of oil on the roller, and significantly improves the roller coating construction performance under roller coating conditions. The roller marks are light, the scratch resistance is good, the workpiece off-line stacking has good anti-adhesion, and the thermal transfer adhesion is excellent, all showing good thermal transfer performance. Other properties such as hardness, scratch resistance, and chemical resistance also fully meet the requirements of general water-based wood coatings, and the product performance meets the two standard requirements of GB18581-2020 Limit 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 property of the bottom line stacking also decrease. In Example 3, the viscosity decreases when the amount of water-based thickening resin is reduced, and the amount of oil applied on the roller decreases as the amount of water-based thickening resin decreases.

[0054] From the comparison between Example 3 and Comparative Examples 1 to 2, it can be seen that the water-based thickening resin B2067 is a water-soluble high-viscosity thickening resin. Unlike ordinary water-based polyurethane associative thickeners that increase the system viscosity by association, its own high viscosity and high solid resin system can bring extremely high high shear viscosity to the coating of the present invention, thereby improving the coating transfer rate during 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 application amount brings high fullness, good leveling and light roller marks to the paint film. A flat paint film with light roller marks can ensure that the transfer film can effectively contact the paint surface during thermal transfer construction, which is a necessary condition for good thermal transfer adhesion.

Claims

1. A water-based roller-coated heat-transferable wood coating, characterized in that: The invention comprises the following components by mass fraction: self-crosslinking water-based acrylic resin 55% to 75%, water-based modified resin 10% to 20%, water-based thickening resin 5% to 10%, defoaming agent 0.2% to 1%, substrate wetting agent 0.2% to 1%, wetting dispersant 0.5% to 3%, film-forming agent 3% to 6%, anti-scratch agent 1% to 5%, leveling agent 0.2% to 1%, deionized water 2% to 10%, anti-settling agent 0.1% to 0.5%, and other materials 0 to 22%; The water-based self-crosslinking acrylic resin is an anionic single-component water-based 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 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 a heating dissolution process using styrene acrylic copolymer, water and dipropylene glycol monobutyl ether as raw materials under the promotion of ammonia.

2. The water-based roller-coated heat-transferable wood coating according to claim 1, characterized in that: The water-based modified resin is at least one of a non-film-forming hard styrene-acrylic copolymer emulsion with a glass transition temperature of 105-125°C and / or a water-based self-crosslinking polyurethane modified acrylic emulsion with a glass transition temperature of 100-105°C.

3. The water-based roller-coated heat-transferable wood coating according to claim 1, characterized in that: The water-based thickening resin is prepared by a method comprising the following steps: 38% to 45% by mass of deionized water, 3% to 7% by mass of dipropylene glycol monobutyl ether and 3% to 7% by mass of ethanol are uniformly mixed to obtain a mixed solvent; 42% to 48% by mass of a styrene acrylic acid copolymer is dispersed in the mixed solvent, 1% to 5% by mass of ammonia water is added, the temperature is gradually raised to 80±5° C. under stirring, and the mixture is dispersed and dissolved for 2 to 5 hours; the temperature is slowly lowered to room temperature to obtain a transparent water-based thickening resin.

4. The water-based roller-coated heat-transferable wood coating according to claim 1, characterized in that: The defoaming agent is at least one of polyether siloxane copolymer defoaming agents; the substrate wetting agent is at least one of polyether modified polydimethylsiloxane and / or silicone twin structure surfactants; the wetting dispersing agent is at least one of a high molecular weight block copolymer solution containing pigment affinity groups and / or a copolymer aqueous solution containing pigment adsorption groups.

5. The water-based roller-coated heat-transferable 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 anti-scratch aid is at least one of an aqueous polyethylene wax emulsion and a modified polyethylene micronized wax; the leveling agent is a polyether-modified polydimethylsiloxane solution or / and an acrylic polymer leveling agent; and the anti-settling aid is a modified urea solution or / and a special modified polyamide solution.

6. The water-based roller-coated heat-transferable wood coating according to claim 1, characterized in that: The other materials are at least one of pigments, matting agents, antioxidants, and anti-yellowing agents.

7. The water-based roller-coated heat-transferable wood coating according to claim 6, characterized in that: The pigment is rutile titanium dioxide; the matting agent is silicon dioxide matting powder; and the addition amount of the matting agent is 0-3%.

8. The method for preparing a water-based roller coating with heat transfer printable wood coating according to any one of claims 1 to 7, characterized in that: The steps include: S1, after the self-crosslinking water-based acrylic resin and the water-based modified resin are mixed evenly, the defoamer, the substrate wetting agent and the wetting dispersant are added thereto, and the mixture is stirred and mixed evenly to obtain a first mixture; S2, an anti-settling aid, other materials and a part of the water-based thickening resin are added to the first mixture, and the mixture is stirred and mixed evenly to obtain a second mixture; S3, the film-forming aid and a part of deionized water are added to the second mixture, and the mixture is stirred and mixed evenly to obtain a third mixture; S4, the anti-scratch aid and the leveling agent are added to the third mixture, and the mixture is stirred and mixed evenly to obtain a fourth mixture; S5, the remaining deionized water and the water-based thickening resin are added to the fourth mixture to adjust the viscosity to obtain the water-based roller-coated thermal transferable wood coating.

9. The method for preparing the water-based roller coating with heat transfer printable wood coating according to claim 8, characterized in that: The stirring speed of step S1 is 600-800 r / min; the stirring speed of step S2 is 1000-1500 r / min, stirring for 25-35 min; the stirring speed of steps S3-S5 is 600-800 r / min.

10. The method for preparing the water-based roller coating with heat transfer printable wood coating according to claim 8, characterized in that: The fineness of the second mixed material is ≤25 μm.

11. Use of the water-based wood coating according to any one of claims 1 to 7 in wooden children's toys, boards, wooden panel furniture and packaging products.

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