Water-based UV paint suitable for SPC floor and coating process

Abstract

The invention discloses a water-based UV paint suitable for an SPC floor and a coating process, and relates to the technical field of plate paints.The water-based UV paint suitable for the SPC floor comprises polyester acrylic resin, polyurethane acrylic resin, deionized water, a coalescing agent, a thickening agent, an anti-settling agent, a wetting agent, a dispersing agent, a defoaming agent, wear-resistant powder, wax powder, matting powder and a photoinitiator; a leveling agent; the water-based UV paint uses deionized water as a solvent, does not contain free monomers, has extremely low VOCs content, can be in direct contact with the paint by a human body, and has no harm to the human body; and the paint is non-flammable, non-explosive and fireproof, and is safer and more reliable to store.

Description

Technical Field

[0001] This invention relates to the field of panel paint technology, specifically to a water-based UV paint and coating process suitable for SPC flooring. Background Technology

[0002] Currently, SPC flooring products on the market typically use oil-based paint for surface treatment. The main components of oil-based paint are resin, photoinitiator, reactive monomers, and additives. Reactive thinners can irritate the skin; if contact with skin is not treated promptly, it can cause varying degrees of chemical burns, leading to erythema or even blisters. Workers must avoid contact with the paint during operation. Furthermore, due to paint evaporation, it can be inhaled and potentially harmful to health. VOC emissions during production are also relatively high, necessitating advanced environmental protection equipment. Summary of the Invention

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide a water-based UV paint and coating process suitable for SPC flooring, which solves the problem of the great harm caused by the use of oil-based paint.

[0004] Technical solution

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] A water-based UV paint suitable for SPC flooring includes polyester acrylic resin, polyurethane acrylic resin, deionized water, film-forming aid, thickener, anti-settling agent, wetting agent, dispersant, defoamer, abrasion-resistant powder, wax powder, matting powder, photoinitiator, and leveling agent.

[0007] Furthermore, the water-based paint formulation components, by the percentage of each component in the total mass, are as follows: polyester acrylic resin 20-30%; polyurethane acrylic resin 30-40%; deionized water 5-10%; film-forming aid 1-3%; thickener 1-3%; anti-settling agent 0.2-0.5%; wetting agent 0.5-0.8%; dispersant 0.3-0.6%; defoamer 0.5-0.8%; abrasion-resistant powder 4-6%; wax powder 1-3%; matting agent 4-6%; photoinitiator 3-5%; leveling agent 0.3-0.6%.

[0008] Furthermore, the film-forming aid is a dodecyl alcohol ester.

[0009] Water-based paint layers use deionized water as a solvent, have no free monomers, and will not cause harm to the human body. They can be directly contacted by the human body. During use, not much organic gas is generated, and the VOC (volatile organic compound) content is extremely low, which meets environmental protection regulations and reduces environmental pollution and usage risks during the production process.

[0010] A coating process for water-based UV paint applicable to the above-mentioned SPC flooring is also disclosed. The water-based UV paint is prepared by mixing raw materials, the board is pretreated, and then a primer and a topcoat are applied in sequence, followed by water cooling.

[0011] Furthermore, the coating process for both the primer and the topcoat is as follows: water-based UV paint is applied to the board surface using a coating roller, a fan is used to blow air onto the board surface to quickly dry the moisture in the paint, an oven is used to heat and dry the residual moisture in the paint, and a UV lamp is used to semi-cur the water-based UV paint to create the paint surface.

[0012] Furthermore, the drying process specifically involves: entering a bridge-type or box-type drying tunnel at a temperature of 60-80℃ to thoroughly dry the residual moisture and some of the co-solvents in the paint.

[0013] Furthermore, the UV semi-curing process involves using a UV light source such as a medium-pressure mercury lamp to bring the paint surface to a "semi-cured" or "touch-dry" state.

[0014] Furthermore, the pretreatment of the board includes dust removal and leveling preheating. The leveling preheating of the board is carried out in a constant temperature oven or infrared heating zone with a temperature of 40-60℃, so that the surface temperature of the board is raised uniformly.

[0015] Furthermore, the topcoat has a lower degree of semi-curing than the primer.

[0016] Furthermore, the coating roller has a hardness of 25HA.

[0017] Beneficial effects

[0018] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0019] 1. Environmentally friendly and safe: Water-based UV paint uses deionized water as a solvent, contains no free monomers, has extremely low VOC content, and is safe for direct human contact without harm to the body; the paint is non-flammable, non-explosive, fireproof, and safer to store.

[0020] 2. Superior performance: Water-based UV-cured coatings generally have better film flexibility than oil-based UV-cured coatings, making them particularly suitable for materials that expand and contract with temperature changes. They are almost free from problems such as film cracking and easy breakage of the coated material. Their resistance to yellowing and weathering is also superior to that of oil-based UV-cured coatings.

[0021] 3. High production efficiency: UV curing speed is fast, which greatly shortens the production cycle compared with other water-based paints.

[0022] 4. Low overall cost: No expensive environmental protection equipment is required, and energy consumption is relatively low. Attached Figure Description

[0023] Figure 1The equipment layout of this invention is based on the production flow chart. Detailed Implementation

[0024] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Combined with appendix Figure 1 A water-based UV paint suitable for SPC flooring, the water-based paint formulation components are: polyester acrylic resin, polyurethane acrylic resin, deionized water, film-forming aid, thickener, anti-settling agent, wetting agent, dispersant, defoamer, abrasion-resistant powder, wax powder, matting powder, photoinitiator, and leveling agent.

[0026] Polyester acrylic resin and polyurethane acrylic resin are the core components of water-based paints, determining the basic properties of the paint film. Both resins are typically modified water-based dispersions or emulsions. Polyester acrylic resin generally offers excellent fullness, leveling, and gloss. Polyurethane acrylic resin generally offers excellent abrasion resistance, chemical resistance, toughness, and adhesion. Combining them is intended to leverage their respective strengths and compensate for their weaknesses, resulting in a paint film with superior overall performance, balancing hardness and toughness, gloss, and fullness.

[0027] Deionized water serves as a solvent or dispersion medium, replacing traditional organic solvents in paints (such as banana oil and xylene). Deionized water is non-toxic, odorless, non-flammable, and environmentally friendly. It is used to prevent impurities such as metal ions in the water from affecting resin stability or causing paint film defects.

[0028] Film-forming aids help resin particles deform and fuse after moisture evaporation, forming a continuous, dense, and transparent paint film. Film-forming aids act as temporary co-solvents, lowering the minimum film-forming temperature of the resin. Without them, after moisture evaporation at low temperatures, resin particles may remain as independent powders, unable to adhere and form a film, leading to cracking and chalking of the paint film. The preferred film-forming aid is dodecyl alcohol ester, which has high film-forming efficiency, good hydrolytic stability, and a slow evaporation rate, providing sufficient time for leveling and fusion.

[0029] Thickeners, anti-settling agents, wetting agents, dispersants, defoamers, and leveling agents are all processing and application aids. Although the amount of these aids used is small, they are crucial to the production, storage, and application performance of paints.

[0030] Thickeners regulate rheological properties, prevent sedimentation, and ensure storage stability. They work synergistically with anti-settling agents and are crucial for storage stability. They also control workability, prevent sagging, and can affect film formation and appearance. They are used in conjunction with anti-settling agents, leveling agents, and other components.

[0031] Anti-settling agents are usually a type of thickening thixotropic agent. When paint is stored statically, they form a three-dimensional network structure that supports solid particles, preventing them from settling and clumping. This ensures that the paint can be easily re-stirred after opening the can. When used in conjunction with a thickener, the anti-settling effect is even better.

[0032] Wetting agents are used to reduce the surface tension of the system, allowing the paint to better wet the surface of the object being coated (such as wood and metal) and prevent pinholes.

[0033] Dispersants are used during production and storage to keep solid particles such as abrasion-resistant powder and matting powder stably suspended in water, preventing them from re-aggregating and settling, and ensuring the uniformity of the system.

[0034] Defoamers are used during production (high-speed mixing) and application (brushing, rolling) to suppress the generation of foam and eliminate existing foam, preventing defects such as pinholes and fisheyes from appearing after the paint film dries.

[0035] Leveling agents are used to improve the flow characteristics of paint after application, enabling the paint film to level automatically, forming a smooth and flat surface, and reducing brush marks, orange peel, and other defects.

[0036] Thickeners, anti-settling agents, wetting agents, dispersants, defoamers, and leveling agents can all be directly selected from similar products on the market, saving costs while ensuring performance.

[0037] Abrasion-resistant powders are used to significantly improve the wear resistance and scratch resistance of paint films, thus extending their lifespan. Commonly used powders include alumina and silicon carbide.

[0038] Wax powder is used to float on the surface of the paint film, providing a smooth feel, scratch resistance, and anti-blocking properties. It can also affect the matte finish and texture to some extent.

[0039] Matte powders reduce the gloss of paint films and achieve a matte or semi-matte finish by creating micro-roughness on their surfaces, which scatters light. Common examples include silica.

[0040] Photoinitiators are a key component unique to UV-curable waterborne paints. Under ultraviolet light of a specific wavelength, photoinitiators absorb light energy and generate active free radicals, which initiate a rapid polymerization and cross-linking reaction of unsaturated double bonds in the resin, causing the paint film to instantly solidify from a liquid state.

[0041] The water-based paint formulation components, by the percentage of each component in the total mass, are as follows: polyester acrylic resin 20-30%; polyurethane acrylic resin 30-40%; deionized water 5-10%; film-forming aid 1-3%; thickener 1-3%; anti-settling agent 0.2-0.5%; wetting agent 0.5-0.8%; dispersant 0.3-0.6%; defoamer 0.5-0.8%; abrasion-resistant powder 4-6%; wax powder 1-3%; matting agent 4-6%; photoinitiator 3-5%; leveling agent 0.3-0.6%.

[0042] A coating process for water-based UV paint uses roller coating. The matching coating roller has a hardness of 25HA. The coating roller is required to be flat and smooth to facilitate overall coating effect. After complete curing, the surface should be flat and not rough. Specifically:

[0043] The above raw materials are thoroughly mixed to obtain water-based UV paint;

[0044] Water-based UV paint consists of two parts when applied to boards: a primer and a topcoat.

[0045] Pre-treatment of the board material is performed.

[0046] Dust is removed from the surface of the board using a dust collector to ensure a clean surface.

[0047] The board is preheated by a leveling heating box, which allows the paint to adhere better to the board surface;

[0048] First, apply a primer. The primer application process is as follows:

[0049] Water-based UV paint is applied to the board surface as a primer using a coating roller;

[0050] Use a fan to blow air onto the board surface to quickly dry the moisture in the paint.

[0051] The residual moisture in the paint is dried by heating in an oven.

[0052] Use a UV lamp to semi-cur the water-based UV coating, thus creating a primer.

[0053] Then apply the topcoat; the topcoat application process is the same as the primer application process.

[0054] Water-based UV paint is applied to the board surface as a topcoat using a coating roller;

[0055] Use a fan to blow air onto the board surface to quickly dry the moisture in the paint.

[0056] The residual moisture in the paint is dried by heating in an oven.

[0057] Use a UV lamp to semi-cur the water-based UV coating, thus creating the topcoat.

[0058] Afterwards, the painted boards are passed through a water tank to cool them and release stress, thus completing the coating process.

[0059] The core objective of this process is to form a dense, smooth, highly adhesive, wear-resistant, scratch-resistant, and aesthetically pleasing protective film on the surface of the board. The entire process can be divided into four stages: pretreatment, primer coating, topcoat coating, and post-treatment.

[0060] Phase 1: Preprocessing.

[0061] Dust removal: A high-pressure ion fan is used in conjunction with a roller brush or vacuum adsorption system. The board first passes through a roller brush to remove larger particles, and then passes through a high-pressure ion air zone to blow away fine dust and neutralize the static electricity generated on the board surface due to friction, preventing the re-adsorption of dust.

[0062] It is used to remove all visible and invisible dust, sawdust, and other impurities from surfaces, and prevents secondary dust contamination caused by static electricity.

[0063] Eliminate pinholes and pitting: Any residual dust will create defects on the paint film, affecting smoothness and protective performance. At the same time, a clean surface allows the paint to bond more tightly to the fiber of the board.

[0064] Leveling and preheating: The board material is passed through a constant temperature oven or infrared heating zone at 40-60℃ for 1-3 minutes, the time of which is adjusted according to the thickness and material of the board. This ensures a uniform increase in surface temperature and evaporates any trace moisture that may have been absorbed during storage. Preheating also enhances the molecular activity of the board surface, making it more conducive to paint wetting and spreading.

[0065] Preheating the board allows the paint to penetrate the board's ducts more easily, creating a strong "anchoring" effect. After the paint is applied, the reduced temperature difference between the paint and the board surface results in more stable flow, making it easier to form a smooth paint film and reducing the "orange peel" effect. This lays the foundation for subsequent moisture evaporation and shortens the drying time.

[0066] Second stage: Primer application.

[0067] The main functions of the primer layer are to fill, seal, and apply a base coat.

[0068] Precision Coating: Utilizing high-precision micro-engraved rollers or comma-shaped doctor blade roller coaters. By precisely controlling the cell depth of the rollers, the pressure between the rollers and the doctor blade, and the roller speed ratio, water-based UV paint is evenly transferred to the substrate at a set thickness (typically 10-30 micrometers). This quantitative and uniform paint delivery ensures consistent subsequent curing results, avoiding areas that are too thick or too thin. It achieves virtually no waste, with a coating efficiency exceeding 95%. Furthermore, different surface effects, such as matte, glossy, and textured, can be achieved by changing rollers with different textures. Different surface finishes can also be created by adjusting the matte powder in the paint or adding a clear coat.

[0069] Pre-evaporation of moisture (fan blowing): Immediately after coating, the surface is moved into a high-wind zone, where a high-volume, low-temperature circulating air system (such as an air knife) is used to blow away moisture from the paint surface, causing it to initially lose its fluidity and form a "film".

[0070] The paint is initially thickened before entering the oven to prevent dripping on vertical or inclined surfaces. This reduces the load on subsequent ovens and shortens the production line length.

[0071] Infrared / Hot Air Drying: The air enters a bridge-type or box-type drying tunnel at a temperature of 60-80℃. A hot air circulation system ensures uniform temperature. Precise temperature and airflow control are required at this stage to ensure complete evaporation of moisture. This thoroughly dries any remaining moisture and some of the co-solvents from the paint.

[0072] If the moisture in water-based UV paint is not completely removed, steam will be generated during UV curing, leading to blistering, pinholes, or incomplete curing of the paint film. Physical drying should be completed before curing to allow the paint film to shrink fully and adhere tightly to the board.

[0073] UV semi-curing: This involves irradiating the paint with a UV light source such as a medium-pressure mercury lamp at a specific wavelength (e.g., 365nm) and energy (e.g., 300-500mJ / cm²). The energy and irradiation time are precisely controlled to achieve a "semi-cured" or "touch-dry" state. This triggers a photoinitiator reaction in the paint, causing the resin monomers to cross-link and polymerize, but the reaction is not complete.

[0074] The semi-cured primer layer has sufficient hardness to withstand the application of the topcoat, while retaining a certain degree of activity, allowing it to chemically bond with the topcoat (interlayer adhesion). The semi-cured state also gives the paint film a certain degree of toughness, making it less likely to produce sandpaper marks or be completely worn through during sanding.

[0075] Third stage: Topcoat application.

[0076] The topcoat layer primarily provides the final visual effect (such as gloss and feel) and the highest resistance to abrasion, scratches, and chemicals. Its process is based on the same principle as the primer, but with higher requirements.

[0077] Coating: The topcoat rollers require higher precision to ensure a final mirror finish or feel. The film thickness may be slightly less than that of the primer.

[0078] Drying and Curing: Process parameters (temperature, air velocity, UV energy) may need to be fine-tuned to match the topcoat's formulation characteristics. The topcoat undergoes full curing to retain better leveling and overall performance after final curing.

[0079] Fourth stage: Post-treatment (water cooling)

[0080] After the sheet material comes out of the UV oven, it is immediately cooled through a water curtain or water mist channel at room temperature or low temperature (15-25℃), or indirectly through cooling rollers.

[0081] Because UV curing is an exothermic reaction, the substrate temperature is very high (up to 70-90℃). Rapid cooling prevents the substrate from deforming or warping due to thermal stress. Rapid cooling also releases stress within the substrate; thermal expansion and contraction during coating and resin curing shrinkage accumulate internal stress. Sudden cooling effectively "freezes" and releases this stress, improving product dimensional stability. For some water-based UV systems, moisture can promote the final stable state of unreacted monomers.

[0082] It can ensure the flatness of the product; improve the durability of the paint film, reduce internal stress, and effectively prevent the paint film from cracking due to changes in temperature and humidity during subsequent use.

[0083] Once cooled to room temperature, the boards can be inspected and packaged, improving efficiency.

[0084] The above process combines the environmental advantages of water-based paints with the high performance and efficiency of UV paints. The preheating temperature, coating amount, drying temperature and time, and UV energy involved in the process can all be strictly parameterized and monitored according to the specific material of the board, the paint formula, and the performance of the equipment.

[0085] The entire painting workshop, especially the coating section, should maintain a high level of cleanliness and constant temperature and humidity, which are essential conditions for producing high-end products. Online film thickness gauges and defect detection systems should be installed at key workstations such as after coating and after curing to achieve real-time quality control.

[0086] Example 1:

[0087] The flooring is placed on the coating line through the above production process.

[0088] Paint is applied to the surface of a coating roller at a rate of 8-12 g / m². The coating amount is controlled by adjusting the speed ratio between the coating roller and the steel roller, as well as the height of the coating roller. An air duct is used to dry as much of the water in the paint as a solvent, and then an oven is used to completely dry the paint. Therefore, the air duct needs to be as long as possible with a large air volume, and the oven needs to be equipped with an exhaust system to prevent excessive humidity inside the oven, which would result in poor drying.

[0089] Considering the textured surface of the board, the paint needs to penetrate into the embossing; therefore, the primer needs to be applied using a brush roller. Due to paint adhesion requirements, the primer needs to be applied using a three-lamp UV machine for semi-curing. Then the topcoat is applied. After the topcoat is applied, the paint is cooled with water. Failure to do so may cause internal stress in the board to lead to shrinkage and warping, resulting in substandard quality.

[0090] Comparative Example 1:

[0091] This comparative example uses the mainstream oil-based UV paint and its production process currently available for SPC flooring.

[0092] Paint formulation: The paint system is mainly based on acrylate oligomers and contains 30%-50% reactive diluents (such as TPGDA, HDDA, etc.) to adjust the viscosity. The system is water-free, and the solvent is the aforementioned reactive monomers.

[0093] Production process:

[0094] The pretreatment process is similar to that of this invention, involving dust removal. No preheating to remove moisture is required. The paint is fed via a roller coater, with the coating amount controlled at 8-12 g / m². After coating, the paint directly enters a UV curing device equipped with mercury lamps for curing. Because it contains no water, no air drying or baking steps are needed, resulting in extremely fast curing.

[0095] However, this comparative model requires a powerful VOC collection and treatment system to handle the organic gases emitted during the production process. Furthermore, the paint film has poor flexibility and is prone to cracking during the thermal expansion and contraction of SPC flooring. Its resistance to yellowing and weathering is also inferior to the water-based UV paint of this invention.

[0096] Comparative Example 2:

[0097] Conventional water-based paint (non-UV curing) process

[0098] This comparative example uses environmentally friendly but non-UV-cured conventional water-based acrylic paint to demonstrate the advantages of the "UV-curing" characteristic of this invention.

[0099] Paint formulation: Water-based acrylic emulsion is the main film-forming substance, combined with additives (film-forming aids, wetting agents, etc.). Its curing mechanism is physical drying, that is, after the water evaporates, the emulsion particles fuse to form a film.

[0100] Production process:

[0101] The pretreatment is the same, and the paint is applied by roller coating.

[0102] After coating, the board must pass through a long drying tunnel with multiple temperature zones. First, it levels and slowly evaporates most of the moisture in a low-temperature zone (e.g., 60-80°C), then undergoes final curing in a higher-temperature zone (e.g., 80-100°C). The entire drying and curing process takes significantly longer than UV curing, typically several minutes or even longer. No UV lamps are required, but the drying tunnel is energy-intensive.

[0103] While conventional water-based acrylic paints have lower VOCs, they have slower curing speeds and lower production efficiency; the hardness and abrasion resistance of the paint film are inferior to those of UV-cured paints; they require longer leveling and drying times, resulting in higher energy consumption.

[0104] Example 1 (Water-based UV Paint Process): By adopting water-based UV paint and its optimized production process, the limitations of Comparative Example 1 (Oil-based UV Paint Process) and Comparative Example 2 (Conventional Water-based Paint Process) are effectively overcome. The specific advantages are as follows:

[0105] Environmental protection and safety:

[0106] Comparative Example 1 uses oil-based UV paint containing 30%-50% reactive diluent, generating a large amount of VOCs (volatile organic compounds), requiring an expensive VOC collection and treatment system. In contrast, Example 1 uses water-based UV paint with deionized water as a solvent, resulting in extremely low VOC content and eliminating the need for additional VOC treatment equipment, thus reducing the environmental burden. Furthermore, the paint is non-flammable and non-explosive, making it safer to store and use, and it is safe for direct human contact without harm to health.

[0107] Excellent performance:

[0108] The oil-based UV paint in Comparative Example 1 has poor film flexibility, making it prone to cracking during the thermal expansion and contraction of SPC flooring, and it also lacks sufficient resistance to yellowing and weathering. In contrast, the conventional water-based paint in Comparative Example 2 has poor film hardness and abrasion resistance. The water-based UV paint in Example 1 overcomes these shortcomings: the film has good flexibility, can adapt to the thermal expansion and contraction of the material, and almost does not crack; it also has excellent resistance to yellowing, weathering, hardness, and abrasion, ensuring the long-term aesthetics and durability of the flooring.

[0109] High production efficiency:

[0110] The conventional water-based paint in Comparative Example 2 has a slow curing speed, requiring several minutes of drying time in the oven, resulting in low production efficiency. While the oil-based UV paint in Comparative Example 1 cures quickly, it requires pretreatment. Example 1 utilizes UV curing technology, achieving extremely fast curing speed. Combined with air ducts and an oven, it rapidly removes moisture, significantly shortening the production cycle and improving production efficiency.

[0111] Low overall cost:

[0112] Comparative Example 1 requires investment in a powerful VOC treatment system, increasing equipment costs; Comparative Example 2 suffers from high operating costs due to its long, energy-intensive drying tunnel. Example 1 eliminates the need for expensive environmental protection equipment, has lower UV curing energy consumption, and features an efficient air duct and oven design with proper overall energy control, thereby reducing overall production costs.

[0113] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A water-based UV paint suitable for SPC flooring, characterized in that, Including polyester acrylic resin, polyurethane acrylic resin, deionized water, film-forming aids, thickeners, anti-settling agents, wetting agents, dispersants, defoamers, abrasion-resistant powder, wax powder, matting powder, photoinitiators, and leveling agents.

2. The water-based UV paint for SPC flooring according to claim 1, characterized in that, The water-based paint formulation components, by the percentage of each component in the total mass, are as follows: polyester acrylic resin 20-30%; polyurethane acrylic resin 30-40%; deionized water 5-10%; film-forming aid 1-3%; thickener 1-3%; anti-settling agent 0.2-0.5%; wetting agent 0.5-0.8%; dispersant 0.3-0.6%; defoamer 0.5-0.8%; abrasion-resistant powder 4-6%; wax powder 1-3%; matting agent 4-6%; photoinitiator 3-5%; leveling agent 0.3-0.6%.

3. The water-based UV paint suitable for SPC flooring according to claim 2, characterized in that, The film-forming aid is a dodecyl alcohol ester.

4. A coating process for a water-based UV paint suitable for SPC flooring according to any one of claims 1-3, characterized in that, Water-based UV paint is prepared by mixing raw materials. The substrate is pretreated, and then coated with primer and topcoat in sequence, followed by water cooling.

5. A water-based UV paint suitable for SPC flooring according to claim 4, characterized in that, The coating process for both the primer and the topcoat is as follows: water-based UV paint is applied to the board surface using a coating roller, a fan is used to blow air onto the board surface to quickly dry the moisture in the paint, an oven is used to heat the paint to dry any remaining moisture, and a UV lamp is used to semi-cur the water-based UV paint to create the paint surface.

6. A water-based UV paint suitable for SPC flooring according to claim 5, characterized in that, The drying process involves placing the paint in a bridge-type or box-type drying tunnel at a temperature of 60-80℃ to thoroughly dry any remaining moisture and some of the co-solvents in the paint.

7. A water-based UV paint suitable for SPC flooring according to claim 4, characterized in that, The UV semi-curing process involves using a UV light source, such as a medium-pressure mercury lamp, to bring the paint surface to a "semi-cured" or "touch-dry" state.

8. A water-based UV paint suitable for SPC flooring according to claim 4, characterized in that, The pretreatment of the board includes dust removal and leveling preheating. The leveling preheating of the board is carried out in a constant temperature oven or infrared heating zone with a temperature of 40-60℃, so that the surface temperature of the board is raised uniformly.

9. A water-based UV paint suitable for SPC flooring according to claim 5, characterized in that, The topcoat has a lower degree of semi-curing than the primer.

10. A water-based UV paint suitable for SPC flooring according to claim 5, characterized in that, The coating roller has a hardness of 25HA.

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