Matte water-based shower-coating finish paint for floor as well as preparation method and application of matte water-based shower-coating finish paint

Abstract

The invention belongs to the technical field of coating materials, and relates to matte water-based shower coating finish paint for floors and a preparation method and application thereof.The finish paint is prepared from polyurethane acrylate, modified polyacrylate emulsion, a photoinitiator, modified nano-silica and other components through the steps of pre-dispersion, multi-stage stirring dispersion, filtering packaging and the like. The invention further discloses a matte water-based shower-coating solid wood composite floor adopting the finishing paint and a production process of the matte water-based shower-coating solid wood composite floor, the floor comprises three or more layers of base materials, a roller-coating primer layer and a shower-coating finishing paint layer, and the floor is prepared through base material pretreatment, multiple times of primer coating, finishing paint shower-coating curing and post-treatment. The finish paint is scientific in formula, overcomes the defects of shrinkage cavity, poor wear resistance and the like of the traditional water-based shower paint, and has the advantages of uniform matte paint film, hardness of more than or equal to 2H, excellent wear resistance, VOC emission of less than or equal to 5g / L, and good environmental protection property. The matched production process is efficient and controllable, product storage is stable, the floor lock catch is good in mute effect, and the floor lock catch is suitable for industrial large-scale production and meets the market requirements of high-quality wood floors.

Description

Technical Field

[0001] This invention belongs to the field of coating materials technology, and relates to wood flooring surface coating technology, and particularly to a matte water-based spray coating for flooring, its preparation method and application. Background Technology

[0002] With increasing environmental pressure, the research and application of water-based coatings are becoming more and more widespread. Currently, most flooring uses UV paint, but its environmental protection and performance cannot meet the requirements of new consumers. At present, water-based coatings have problems such as pinholes, poor wear resistance, poor hardness, and high gloss of the paint film.

[0003] To address the aforementioned issues, existing technologies have explored relevant approaches. For example, CN104610824B discloses a water-based, matte-finish topcoat for spray coating, which comprises the following components in weight percentages: 35%–45% water-based acrylic resin, 16%–20% water-based polyurethane-modified acrylic resin, 0.1%–0.2% defoamer, 3%–5% matting agent, 5%–7% film-forming aid, 0.5%–1% wetting agent, 0.5%–1% dispersant, 0.5%–1% thickener, with the balance being water. This effectively solves the problems of easy foaming, pinholes, blistering, and color fading associated with traditional water-based paints during spray coating, and provides a good surface finish, a uniform and matte gloss, and a fine paint film. However, this product still has room for improvement in terms of wear resistance and hardness, and the formulation does not involve a nanomaterial reinforcement system. CN112876963A discloses a water-based spray-coated floor paint and its preparation method. The water-based spray-coated floor paint is prepared from the following raw materials in parts by weight: 75-85 parts water-based polyurethane resin, 10-15 parts hydroxyl acrylic resin, 2-8 parts long-oil alkyd resin, 6-8 parts film-forming aid, 2-3 parts ultrafine talc powder, 2-4 parts glass powder, 0.3-1 part defoamer, 0.2-0.5 parts wetting agent, 1.5-3 parts sanding aid, and bactericide. The formula contains 0.1–0.3 parts of antifungal agent, 0.1–0.3 parts of thickener, 0.5–1.5 parts of dispersant, 0.3–0.5 parts of hand feel additive, 0.5–1.5 parts of matte powder, and 2–5 parts of water. It has high adhesion, hardness, and abrasion resistance, which can better improve the service life of the wood flooring. It also has good stability and can be stored for a long time. However, the formula is complex and the amount of matte powder added is small, so the durability of the matte effect needs to be verified.

[0004] Given the shortcomings of existing technologies, developing a water-based spray coating for floors that is environmentally friendly, quick-drying, highly stain-resistant, highly wear-resistant, highly hard, and has a stable matte finish, along with a matching efficient production process, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The primary objective of this invention is to overcome the defects of existing water-based spray coatings, such as pinholes, poor wear resistance, low hardness, and high gloss, and to provide a matte water-based spray coating for floors with a reasonable formula and simple preparation process. This coating is environmentally friendly, quick-drying, has a uniform matte finish, is wear-resistant and scratch-resistant, and has a delicate surface.

[0006] Technical solution

[0007] A matte water-based spray coating for flooring is composed of the following components in parts by weight: 70-80 parts polyurethane acrylate, 30-50 parts modified polyacrylate emulsion, 3-8 parts photoinitiator, 25-40 parts modified nano silica, 0.2-2 parts leveling agent, 0.2-2 parts defoamer, and 10-25 parts purified water.

[0008] Component descriptions:

[0009] Polyurethane acrylate: As the main film-forming resin, it has excellent abrasion resistance, flexibility and adhesion, providing basic mechanical properties for the coating film; for example, waterborne polyurethane acrylate with a solid content of 50-60% ensures film-forming efficiency and coating film density.

[0010] Modified polyacrylate emulsions: synergistic film formation with polyurethane acrylates, improving the hardness and stain resistance of the paint film. The modified emulsions have better compatibility and can reduce paint film defects; for example, hydroxyl-modified polyacrylate emulsions with a hydroxyl value of 50-80 mg KOH / g.

[0011] Photoinitiators: promote UV curing reaction and increase curing speed. For example, a photoinitiator that is a 1:1 mass ratio of 1-hydroxycyclohexylphenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-propanone can balance curing efficiency and yellowing of the paint film.

[0012] Modified nano-silica: as a reinforcing filler and matting agent, after modification with silane coupling agent, it has good compatibility with the resin system and can significantly improve the hardness, wear resistance and matte effect of the paint film. The particle size is, for example, 50-100nm, ensuring that the paint film is delicate and free of particles; the silane coupling agent is KH-550 silane coupling agent.

[0013] Leveling agents: improve the leveling properties of paint films and reduce defects such as pinholes and orange peel. For example, polyether-modified polysiloxane leveling agents need to be strictly controlled in terms of addition amount to avoid affecting the adhesion of paint films.

[0014] Defoamers: Eliminate bubbles generated during production and construction. For example, silicone defoamers have both defoaming and foam-suppressing functions, ensuring a smooth paint film surface.

[0015] Purified water: used as a dilution medium to adjust the viscosity of the topcoat. For example, deionized water with a conductivity ≤10μS / cm is used to avoid impurities affecting the performance of the paint film.

[0016] Another objective of this invention is to provide a method for preparing the above-mentioned matte water-based spray coating, which is controllable in operation, highly efficient in production, and suitable for large-scale industrial production.

[0017] The specific steps for preparing the above-mentioned matte water-based spray coating for flooring are as follows:

[0018] S1 Preparation: Weigh each component accurately according to the above mass ratio to ensure that the purity of the raw materials meets the requirements. Modified nano silica needs to be dried at 105℃ for 2 hours in advance to remove moisture.

[0019] S2 pre-dispersion: Add 30-50 parts of modified polyacrylate emulsion to the mixing tank, start the mixer, and stir at a slow and uniform speed of 300-500 rpm for 15 minutes to make the emulsion evenly dispersed.

[0020] S3 Photoinitiator Addition: While maintaining stirring, add 3-8 parts of photoinitiator to the stirred tank, adjust the stirring speed to 600-1000 rpm, and stir at medium speed for 10 minutes to ensure that the photoinitiator is completely dissolved and evenly dispersed;

[0021] S4 Modified Nano Silica Dispersion: Reduce the stirring speed to 300-500 rpm, and add 25-40 parts of modified nano silica to the mixing vessel at a uniform speed. After the addition is complete, increase the stirring speed to 1200-1500 rpm and stir at high speed for 10-15 minutes to fully disperse the modified nano silica and form a stable suspension system.

[0022] Adding S5 main resin: Reduce the stirring speed to 300-500 rpm, add 70-80 parts of polyurethane acrylate, adjust the stirring speed to 600-800 rpm, and stir at medium speed for 5 minutes to fully integrate the resin with the dispersion system;

[0023] Adding S6 auxiliary components: Maintain a stirring speed of 300-500 rpm, and add 10-25 parts of purified water, 0.2-2 parts of defoamer, and 0.2-2 parts of leveling agent to the mixing vessel in sequence, with an interval of 2 minutes between additions, to ensure that all components are mixed evenly, and continue stirring for 5 minutes;

[0024] S7 Filter Packaging: Filter the well-stirred topcoat through a 200-mesh filter to remove any impurities and incompletely dispersed particles. After filtration, seal the package and store in a cool, dry place.

[0025] The third objective of this invention is to provide a matte water-based coated solid wood composite floor using the above-mentioned topcoat and its manufacturing process. This floor not only has excellent environmental performance, but also has a long service life and good locking and noise reduction effect, which can meet the market demand for high-quality wood flooring.

[0026] A matte water-based coated solid wood composite flooring includes three or more layers of substrate, a roller-coated primer layer, and a coated topcoat layer, wherein the coated topcoat layer is prepared using the aforementioned matte water-based coated topcoat for flooring; the substrate is a three or more layers of solid wood composite board with a moisture content of 8-12%; the roller-coated primer layer includes a UV water-based high-hardness primer, a UV water-based high-definition primer, and a UV water-based wear-resistant primer.

[0027] The production process of the above-mentioned matte water-based coated engineered wood flooring includes the following steps:

[0028] A. Substrate Pretreatment: Select three-layer or multi-layer solid wood composite boards with a moisture content of 8-12%. Finely sand the surface of the boards to a grit of 180-240 to remove burrs and impurities. Then, perform tenoning to ensure precise locking mechanisms. Finally, apply a color-retaining agent using a roller coating method, with a coating amount of 8-10 g / m². 2 Allow to air dry naturally for 10-15 minutes to prevent the substrate from discoloring;

[0029] B. First coat of primer: Apply UV water-based high-hardness primer (brand name SW5603) using roller coating process, with a coating amount of 14-16 g / m². 2 Immediately proceed with UV drying to a semi-dry state, with curing energy controlled at 80-100 J / cm², and the total coating and drying time controlled within 14-15 seconds to enhance the adhesion between the paint film and the substrate.

[0030] C. Second primer coating: Apply UV water-based high-definition primer (brand name SW5601), with a roller coating amount of 14-16 g / m². The coating and drying time should be controlled within 14-15 seconds. After drying, lightly polish with 400-600 grit sandpaper to remove surface micro-particles and improve the smoothness of the paint film.

[0031] D. Third coat of primer: Apply a second coat of UV water-based high-hardness primer (brand name SW5603), roller coating application rate 14-16 g / m². 2 The color is evenly applied using a brush, followed by UV drying until semi-dry, with a curing energy of 80–100 J / cm². 2 The coating and drying time should be controlled within 11-12 seconds; then, apply UV water-based abrasion-resistant primer (brand name SW5602) and UV water-based high-definition paint (brand name SW5601) sequentially by roller, with each coat having a coverage of 12-14 g / m². 2 After coating, the paint film is uniformly colored with a brush and polished with 400-600 grit sandpaper to enhance its wear resistance and surface smoothness.

[0032] E. Topcoat Coating and Curing: The prepared matte water-based topcoat is heated to 50°C and circulated through a curtain sprayer to ensure stable topcoat temperature. The primer-treated floor is placed on a single conveyor belt at a speed of 70-80 m / min, with a topcoat application rate of 35-40 g / m². 2 After coating, the floor first passes through a 7-10 meter infrared drying and leveling zone at a temperature of 60-70℃ to ensure even coating spread. It then enters the UV curing zone, where the UV lamp drying energy is controlled at 120-150 J / cm². 2 Ensure the paint film is completely cured;

[0033] F. Post-processing: After the cured floor is cooled to room temperature, it is lightly sanded and trimmed with 800-1000 grit sandpaper to remove excess paint film from the edges. Then it is inspected, graded and packaged.

[0034] Beneficial effects

[0035] The matte water-based spray coating formulation of this invention is scientifically formulated. Through the synergistic effect of polyurethane acrylate and modified polyacrylate emulsion, combined with the enhancement and matting effect of modified nano-silica, it effectively solves the problems of easy bubbling, pinholes, and excessive gloss in traditional water-based spray coatings. The gloss of the coating film is controlled at 10-15° (60° angle), resulting in a uniform matte finish and a delicate surface. The modified nano-silica added to the topcoat significantly improves the wear resistance and hardness of the coating film. Testing shows that the pencil hardness of the coating film is ≥2H, and the wear resistance (Taber abrasion tester, 1kg load, 500 revolutions) weight loss is ≤5mg, far superior to existing technologies, extending the service life of the flooring. The preparation method of this invention is simple to operate, with precise control of stirring speed and time in each step, ensuring full dispersion of all components, good product stability, and a shelf life of over 12 months, making it suitable for large-scale industrial production. Solid wood composite flooring prepared using the topcoat and production process of this invention exhibits excellent environmental performance, with low VOC emissions. With emissions ≤5g / L, it meets national environmental protection standards. Meanwhile, the topcoat applied to the locking mechanism can fill the gaps between the locking mechanisms, effectively reducing the noise of the locking mechanism after the floor is installed and improving the user experience. In the production process, the coating parameters of the primer and topcoat are optimized, the UV curing efficiency is high, the total production cycle is short, and the production cost is controllable, resulting in significant economic benefits and market competitiveness. Detailed Implementation

[0036] The present invention will be described in detail below with reference to embodiments to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following embodiments. Unless otherwise specified, the raw materials and equipment involved in the embodiments are all conventional commercially available products in the art.

[0037] Example 1

[0038] Preparation of matte water-based spray coating for flooring

[0039] Raw material ratio (parts by weight): 75 parts polyurethane acrylate, 40 parts modified polyacrylate emulsion, 5 parts photoinitiator (1-hydroxycyclohexylphenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-propanone compounded in a mass ratio of 1:1), 30 parts modified nano silica (particle size 80nm, modified with KH-550 silane coupling agent), 1 part leveling agent (polyether modified polysiloxane), 1 part defoamer (organosilicon), and 20 parts purified water.

[0040] Preparation steps:

[0041] The modified nano-silica was dried at 105℃ for 2 hours and then set aside.

[0042] Add 40 parts of modified polyacrylate emulsion to the mixing tank, stir slowly at 300 rpm, and stir at 25°C for 15 minutes;

[0043] Add 5 parts of photoinitiator, adjust the stirring speed to 800 rpm, and stir at medium speed for 10 minutes;

[0044] Reduce the speed to 300 rpm, add 30 parts of modified nano-silica at a uniform speed, then increase the speed to 1400 rpm and stir at high speed for 12 minutes;

[0045] Reduce the speed to 300 rpm, add 75 parts of polyurethane acrylate, adjust to 700 rpm, and stir at medium speed for 5 minutes;

[0046] Maintain a speed of 300 rpm, and add 20 parts purified water, 1 part defoamer, and 1 part leveling agent in sequence, with a 2-minute interval between each addition, and stir for 5 minutes.

[0047] Filtered with a 200-mesh screen and sealed in packaging.

[0048] Production of matte water-based coated engineered wood flooring

[0049] Substrate pretreatment: Select three-layer solid wood composite board with a moisture content of 10%, sand with 180-grit sandpaper, and after tenoning, apply a color-retaining agent by roller with a coating amount of 9g / m². 2 Let it air dry for 12 minutes;

[0050] First coat of primer: Roller-coated SW5603 UV water-based high-hardness primer, coverage 15g / m² 2 UV drying (curing energy 90 J / cm²) 2 (Total time: 14.5s)

[0051] Second primer coat: Roller-coated SW5601 UV water-based high-definition primer, coverage 15g / m² 2 Drying time 14s, polished with 400-grit sandpaper;

[0052] Third coat of primer: Roller-coated SW5603 UV water-based high-hardness primer, coverage 15g / m² 2 Even color distribution with brush, UV drying (curing energy 90J / cm²) 2 ), time 11.5s; followed by roller coating of SW5602 UV water-based abrasion-resistant primer (coating weight 13g / m²). 2 ) and SW5601 UV water-based high-definition paint (coating weight 13g / m²) 2 ), respectively homogenize color and polish;

[0053] Topcoat spraying: The topcoat is heated to 50℃, the conveyor belt speed is 75 m / min, and the coating amount is 38 g / m. 2 7-meter infrared drying and leveling (65℃), UV curing energy 130J / cm² 2 ;

[0054] Post-processing: After cooling, trim the edges with 800-grit sandpaper, inspect and package.

[0055] Example 2

[0056] Preparation of matte water-based spray coating for flooring

[0057] Raw material ratio (parts by weight): 70 parts polyurethane acrylate, 30 parts modified polyacrylate emulsion, 3 parts photoinitiator (1-hydroxycyclohexylphenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-propanone compounded in a 1:1 ratio), 25 parts modified nano silica (particle size 50nm, modified with KH-550 silane coupling agent), 0.2 parts leveling agent (polyether modified polysiloxane), 0.2 parts defoamer (organosilicon), and 10 parts purified water;

[0058] Preparation steps:

[0059] The modified nano-silica was dried at 105℃ for 2 hours and then set aside.

[0060] Add 30 parts of modified polyacrylate emulsion to the mixing tank, stir slowly at 400 rpm, and stir at 25°C for 15 minutes;

[0061] Add 3 parts of photoinitiator, adjust the stirring speed to 600 rpm, and stir at medium speed for 10 minutes;

[0062] Reduce the speed to 400 rpm, add 25 parts of modified nano-silica at a uniform speed, then increase the speed to 1200 rpm and stir at high speed for 10 minutes;

[0063] Reduce the speed to 400 rpm, add 70 parts of polyurethane acrylate, adjust to 600 rpm, and stir at medium speed for 5 minutes;

[0064] Maintain a speed of 400 rpm, and add 10 parts purified water, 0.2 parts defoamer, and 0.2 parts leveling agent in sequence, with a 2-minute interval between each addition, and stir for 5 minutes.

[0065] Filtered with a 200-mesh screen and sealed in packaging.

[0066] Production of matte water-based coated engineered wood flooring

[0067] Substrate pretreatment: Select multi-layer solid wood composite board with a moisture content of 8%, sand with 200-grit sandpaper, and after tenoning, apply a color-retaining agent by roller with a coating amount of 8g / m². 2 Let it air dry for 10 minutes;

[0068] First coat of primer: Roller-coated SW5603 UV water-based high-hardness primer, coverage 14g / m² 2 UV drying (curing energy 80 J / cm) 2 ), total time 14s;

[0069] Second primer coat: Roller-coated SW5601 UV water-based high-definition primer, coverage 14g / m² 2 Drying time 14s, polished with 500-grit sandpaper;

[0070] Third coat of primer: Roller-coated SW5603 UV water-based high-hardness primer, coverage 14g / m² 2 Even color application with brush, UV drying (curing energy 80J / cm²) 2 ), time 11s; followed by roller coating of SW5602 UV water-based abrasion-resistant primer (coating weight 12g / m²). 2 ) and SW5601 UV water-based high-definition paint (coating weight 12g / m²) 2 ), respectively homogenize color and polish;

[0071] Topcoat spraying: The topcoat is heated to 50℃, the conveyor belt speed is 70 m / min, and the coating amount is 35 g / m. 2 8-meter infrared drying and leveling (60℃), UV curing energy 120J / cm² 2 ;

[0072] Post-processing: After cooling, trim the edges with 900-grit sandpaper, inspect and package.

[0073] Example 3

[0074] Preparation of matte water-based spray coating for flooring

[0075] Raw material ratio (parts by weight): 80 parts polyurethane acrylate, 50 parts modified polyacrylate emulsion, 8 parts photoinitiator (1-hydroxycyclohexylphenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-propanone compounded in a 1:1 ratio), 40 parts modified nano silica (particle size 100nm, modified with KH-550 silane coupling agent), 2 parts leveling agent (polyether modified polysiloxane), 2 parts defoamer (organosilicon), and 25 parts purified water;

[0076] Preparation steps:

[0077] The modified nano-silica was dried at 105℃ for 2 hours and then set aside.

[0078] Add 50 parts of modified polyacrylate emulsion to the mixing tank, stir slowly at 500 rpm, and stir at 25°C for 15 minutes;

[0079] Add 8 parts of photoinitiator, adjust the stirring speed to 1000 rpm, and stir at medium speed for 10 minutes;

[0080] Reduce the speed to 500 rpm, add 40 parts of modified nano-silica at a uniform speed, then increase the speed to 1500 rpm and stir at high speed for 15 minutes;

[0081] Reduce the speed to 500 rpm, add 80 parts of polyurethane acrylate, adjust to 800 rpm, and stir at medium speed for 5 minutes;

[0082] Maintain a speed of 500 rpm, and add 25 parts purified water, 2 parts defoamer, and 2 parts leveling agent in sequence, with a 2-minute interval between each addition, and stir for 5 minutes.

[0083] Filtered with a 200-mesh screen and sealed in packaging.

[0084] Production of matte water-based coated engineered wood flooring

[0085] Substrate pretreatment: Select multi-layer solid wood composite board with a moisture content of 12%, sand with 240-grit sandpaper, and after tenoning, apply a color-retaining agent by roller with a coating amount of 10g / m². 2 Let it air dry for 15 minutes;

[0086] First coat of primer: Roller-coated SW5603 UV water-based high-hardness primer, coverage 16g / m² 2 UV drying (curing energy 100J / cm) 2 ), total time 15s;

[0087] Second primer coat: Roller-coated SW5601 UV water-based high-definition primer, coverage 16g / m² 2 Drying time 15s, polish with 600-grit sandpaper;

[0088] Third coat of primer: Roller-coated SW5603 UV water-based high-hardness primer, coverage 16g / m² 2 Even color application with brush, UV drying (curing energy 100J / cm²) 2 ), time 12s; then roll-coated with SW5602 UV water-based abrasion-resistant primer (coating weight 14g / m²). 2 ) and SW5601 UV water-based high-definition paint (coating weight 14g / m²) 2 ), respectively homogenize color and polish;

[0089] Topcoat spraying: The topcoat is heated to 50℃, the conveyor belt speed is 80 m / min, and the coating amount is 40 g / m. 2 ; 10-meter infrared drying and leveling (70℃), UV curing energy 150J / cm² 2 ;

[0090] Post-processing: After cooling, trim the edges with 1000-grit sandpaper, inspect and package.

[0091] Performance testing

[0092] The performance of the matte water-based spray-coated topcoat and solid wood composite flooring prepared in Examples 1-3 was tested. The testing standards were in accordance with GB / T 18583-2008 "Limits of Harmful Substances in Adhesives for Interior Decoration and Renovation Materials" and GB / T 15102-2017 "Impregnated Paper Laminate Wood Flooring". The test results are shown in the table below:

[0093]

[0094] The test results show that the topcoat and flooring prepared in this embodiment of the invention have better performance than the industry standard requirements, with good matte effect, wear resistance, environmental protection performance and storage stability, and significant quiet locking effect.

[0095] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A matte water-based spray coating for flooring, characterized in that, It is composed of the following components in parts by weight: 70-80 parts polyurethane acrylate, 30-50 parts modified polyacrylate emulsion, 3-8 parts photoinitiator, 25-40 parts modified nano silica, 0.2-2 parts leveling agent, 0.2-2 parts defoamer, and 10-25 parts purified water.

2. The matte water-based spray coating for flooring according to claim 1, characterized in that: The polyurethane acrylate is a waterborne polyurethane acrylate with a solid content of 50-60%; the modified polyacrylate emulsion is a hydroxyl-modified polyacrylate emulsion with a hydroxyl value of 50-80 mgKOH / g; the photoinitiator is a mixture of 1-hydroxycyclohexylphenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-propanone in a mass ratio of 1:

1.

3. The matte water-based spray coating for flooring according to claim 1, characterized in that: The modified nano-silica has a particle size of 50-100 nm and is modified by a silane coupling agent; the silane coupling agent is KH-550 silane coupling agent; the leveling agent is a polyether-modified polysiloxane leveling agent; the defoamer is an organosilicon defoamer; and the conductivity of the purified water is ≤10 μS / cm.

4. A method for preparing a matte water-based spray-coating topcoat for flooring as described in any one of claims 1-3, characterized in that, Includes the following steps: S1 Preparation: Weigh each component according to the mass ratio described in claim 1, wherein the modified nano-silica needs to be dried at 105°C for 2 hours in advance to remove moisture; S2 Pre-dispersion: Add the modified polyacrylate emulsion to the mixing tank and stir at a slow and uniform speed of 300-500 rpm for 15 minutes to make the emulsion evenly dispersed. S3 photoinitiator addition: While stirring, add the photoinitiator, adjust the stirring speed to 600-1000 rpm, and stir for 10 minutes; S4 modified nano silica dispersion: Reduce the stirring speed to 300-500 rpm, add the modified nano silica at a uniform speed, and after the addition is complete, increase the stirring speed to 1200-1500 rpm and stir at high speed for 10-15 minutes to form a stable suspension system; Add S5 main resin: Reduce the stirring speed to 300-500 rpm, add polyurethane acrylate, adjust the stirring speed to 600-800 rpm, and stir for 5 minutes; Add S6 auxiliary components: Maintain a stirring speed of 300-500 rpm, add purified water, defoamer, and leveling agent in sequence, with an interval of 2 minutes between additions, to ensure that all components are mixed evenly, and continue stirring for 5 minutes; S7 Filter Packaging: Filter the well-stirred topcoat through a 200-mesh filter to remove any impurities and incompletely dispersed particles. After filtration, seal the package and store in a cool, dry place.

5. The method for preparing a matte water-based spray-coating topcoat for flooring according to claim 4, characterized in that: The high-speed stirring time in step S4 is 12-15 minutes.

6. A matte water-based coated engineered wood flooring, characterized in that: It includes three or more layers of substrate, a roller-coated primer layer, and a curtain-coated topcoat layer, wherein the curtain-coated topcoat layer is prepared from any of the matte water-based curtain-coated topcoats for flooring as described in claims 1-3 or from the matte water-based curtain-coated topcoat for flooring prepared by the method described in claims 4 or 5.

7. The matte water-based coated solid wood composite flooring according to claim 6, characterized in that: The substrate is a three-layer or multi-layer solid wood composite board with a moisture content of 8-12%; the roller-coated primer layer includes UV water-based high-hardness primer, UV water-based high-definition primer, and UV water-based wear-resistant primer.

8. A manufacturing process for matte water-based coated engineered wood flooring as described in any one of claims 6-7, characterized in that, Includes the following steps: A. Substrate pretreatment: Select three-layer or multi-layer solid wood composite board, sand it, make tenons, then roll-apply a color-preserving agent and let it air dry naturally; B. First coat of primer: Roller-apply UV water-based high-hardness primer and immediately UV dry until semi-dry; C. Second primer coating: Roller-coated UV water-based high-definition primer, followed by light polishing after drying; D. Third coat of primer: Roller-coated UV water-based high-hardness primer, after brush color uniformity, UV dried to semi-dry, then roller-coated UV water-based abrasion-resistant primer and UV water-based high-definition paint, respectively brush color uniformity and polishing treatment. E. Topcoat application and curing: The flooring described in any of claims 1-3 is heated with a matte water-based topcoat and then circulated onto the surface of the flooring treated with a primer using a curtain sprayer, followed by infrared drying and leveling, and UV curing. F. Post-processing: After the floor has cured, it is cooled to room temperature, sanded and trimmed, then inspected, graded, and packaged.

9. The manufacturing process of matte water-based coated solid wood composite flooring according to claim 8, characterized in that: In step A, the sanding grit is 180-240 grit, and the color-retaining agent coating amount is 8-10 g / m². 2 Allow to air dry for 10-15 minutes; in step B, the application rate of the UV water-based high-hardness primer is 14-16 g / m². 2 UV curing energy is 80-100 J / cm. 2 The total coating and drying time is 14-15 seconds; in step C, the coating amount of the UV water-based high-definition primer is 14-16 g / m². 2 The coating and drying time is 14-15 seconds, and polishing is done with 400-600 grit sandpaper.

10. The manufacturing process of matte water-based coated solid wood composite flooring according to claim 8, characterized in that: In step D, the application rate of the UV water-based high-hardness primer is 14-16 g / m². 2 UV curing energy is 80-100 J / cm 2 The coating and drying time is 11-12 seconds; the coating weight of both the UV water-based abrasion-resistant primer and the UV water-based high-definition paint is 12-14 g / m². 2 Polishing is done using 400-600 grit sandpaper; in step E, the topcoat heating temperature is 50℃, the conveyor belt speed is 70-80 meters / minute, and the topcoat application rate is 35-40 g / m. 2 The infrared drying leveling zone is 7-10 meters long, and the leveling temperature is 60-70℃; the UV curing energy is 120-150 J / cm². 2 In step F, 800-1000 grit sandpaper is used for sanding and trimming.

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