Wood flooring panels formed with nano hybrid UV coating

Abstract

The present invention discloses a wood flooring board used for finishing floors of buildings and manufactured to have aesthetic appeal, water resistance, durability, chemical resistance, scratch resistance, and stain resistance. The wood flooring board comprises: a wood flooring substrate layer constituting the basic skeleton of the wood flooring board; a decorative film layer laminated to the upper surface of the wood flooring substrate layer to provide an aesthetic appeal with diverse textures and colors; and a UV coating film layer having a UV coating mixed with nano-silicon dioxide formed on the upper surface for the purpose of achieving scratch resistance and stain resistance, and laminated on the upper surface of the decorative film layer to form the uppermost layer of the wood flooring board.

Description

Technical Field

[0001] The present invention discloses a wood flooring board used for finishing floors of buildings and manufactured to have aesthetic appeal, water resistance, durability, chemical resistance, scratch resistance, and stain resistance. More specifically, the present invention discloses a wood flooring board formed with a nano-hybrid UV coating, which includes: a wood flooring substrate layer formed in a plate shape, constituting the basic skeleton of the wood flooring board; a decorative film layer laminated to the upper surface of the wood flooring substrate layer to provide an aesthetic appeal with diverse textures and colors; a UV coating film layer, which is a film with a UV coating mixed with nano-silicon dioxide formed on the upper surface in order to have scratch resistance and stain resistance, and is laminated on the upper surface of the decorative film layer to form the uppermost layer of the wood flooring board. Background Art

[0002] Recently, in order to improve the living culture and make the interior more upscale and give the entire living space a natural wood texture, the commonly used construction method is to attach wooden flooring panels to the indoor floor to show the original wood texture of the wood. The wooden flooring panels are divided into laminate flooring, plywood flooring and original wood flooring according to their material.

[0003] Laminate flooring, which uses fiberboard as a base material, offers excellent wear resistance, durability, and stain resistance, and is easy to maintain. However, due to limitations in decorative paper and surface pigmentation, it lacks a woody texture. Laminate flooring consists of an upper laminate layer, a middle base layer, and a lower layer to block moisture from below. Fiber is separated from the wood, added with a waterproof resin, and then compressed under high temperature and pressure to form a high-density fiberboard (HDF) base material. The surface is reinforced with high-pressure laminate (HPL) or low-pressure laminate (LPL).

[0004] Furthermore, the laminate flooring can achieve various colors or designs depending on the type of decorative paper. However, due to the limitations of the decorative paper and the melanin deposition on the surface, the wood texture of the laminate flooring is weaker than that of the original wood flooring or plywood flooring.

[0005] The wooden floor is made by directly processing natural logs into wooden floor boards, which are divided into wooden floor strips and wooden floor blocks according to their appearance. Wooden floor strips with a width of 18 to 68 mm and a thickness of 8 to 25 mm are called wooden floor strips, and plank-shaped wooden floor blocks with a width of 75 to 175 mm and a thickness of 8 to 22 mm are called wooden floor blocks. Wooden floor blocks are superior in texture or pattern, and have good impact absorption performance, and are used as flooring materials in classrooms and other places.

[0006] This type of wood flooring is made directly from logs, giving it an excellent texture and is therefore considered the highest grade flooring material. Its materials mainly use broad-leaved trees such as maple, broad-leaf birch, and ash. However, most of the logs need to be imported, making them expensive. Its poor wear resistance makes its surface easily damaged, it is noisy, and it is prone to discoloration and fading. Compared with other wood floors, its thermal conductivity is lower and it requires regular varnishing, making it inconvenient to manage.

[0007] On the other hand, plywood flooring uses plywood as the base material and has a wood grain coating on the surface. The wood grain coating on the surface makes its texture natural and is less susceptible to deformation caused by moisture or heat. However, there are many problems. For example, like original wood flooring, its surface is weak and is easily scratched, stained, and discolored and faded due to ultraviolet light.

[0008] The prior art of flooring materials including laminate flooring, original wood flooring and plywood flooring as mentioned above can be exemplified as follows: Korean Patent Gazette No. 10-1725863 discloses a laminate flooring board composed of a laminated board, which is sequentially laminated with integrated veneer (veneer) or mixed light hardwood (MLH) with a thickness of 0.1 to 3 mm. The invention relates to a method for manufacturing a light hardwood (Light Hardwood) veneer, three laminated veneers with a thickness of 2 to 7 mm, and an HPM sheet, and then performing low-temperature hot pressing at a temperature of 50 to 100°C and a pressure of 10 to 15 kgf / cm. The HPM sheet is sequentially combined with printed gravure paper, a non-woven fabric or paper or synthetic resin cloth with a thickness of 0.1 to 1 mm, and an integrated veneer with a thickness of 0.2 to 3 mm. The lower part of the HPM sheet is provided with three laminated veneers with a thickness of 2 to 7 mm. The lower part of the three veneers is sequentially combined with an integrated veneer with a thickness of 0.1 to 3 mm or a mixed light hardwood (MLH) veneer.

[0009] However, the wooden flooring used in the prior art allows moisture from the floor to penetrate due to temperature differences. The penetrated moisture causes the veneer located below to be deformed or swollen by water. As mentioned above, it is fragile to moisture, and its surface has low scratch resistance, making it prone to scratches or cracks. In particular, although the wooden flooring used in the prior art is coated with a coating liquid to impart scratch resistance to the upper surface of the manufactured wooden flooring used in the present invention, the uneven coating is formed due to the uneven surface of the manufactured wooden flooring used in the present invention and the uneven coating. As a result, the coating is easily peeled off when the wooden flooring comes into contact with external objects during use. Summary of the Invention

[0010] The present invention aims to solve the problems of the prior art. The purpose of the present invention is to provide a wooden flooring board, which is a wooden flooring board having aesthetics, water resistance, durability, chemical resistance, scratch resistance, and pollution resistance, and a film-shaped UV coating film layer is located at the top layer. The wooden flooring board is provided with a wooden flooring substrate layer, a decorative film layer, and a UV coating film layer laminated on top of each other. The wooden flooring substrate layer is made by mixing stone powder and adhesive to improve water resistance and durability, and the aesthetics is enhanced by the decorative film layer with diverse textures and colors. The UV coating film layer formed with a UV coating mixed with nano-silicon dioxide is formed on the top layer of the wooden flooring board to improve scratch resistance, surface hardness and pollution resistance, so that the wooden flooring board has excellent quality.

[0011] The wooden floor board with UV coating that can achieve the above purpose includes: a wooden floor substrate layer, which is formed in a board shape and constitutes the basic skeleton of the wooden floor board; a decorative film layer, which is laminated to the upper surface of the wooden floor substrate layer and provides an aesthetic feeling with diverse textures and colors; a UV coating film layer, which is a film-shaped layer with a UV coating mixed with nano-silicon dioxide formed on the upper surface in order to have scratch resistance and stain resistance, and is laminated to the upper surface of the decorative film layer to form the top layer of the wooden floor board.

[0012] Another feature of the present invention is that the wooden floor substrate layer is formed by mixing 80 to 90 parts by weight of stone powder and 10 to 20 parts by weight of an adhesive.

[0013] Moreover, another feature of the present invention is that polyester polyol prepared by condensation reaction of adipic acid, propylene glycol, diethylene glycol and 1,6-hexanediol, isophorone diisocyanate and 2-hydroxyethyl acrylate mixed with nano-silica are mixed to prepare polyurethane acrylate resin and used as the base resin to prepare UV coating liquid, and then the UV coating liquid is coated on the upper surface of the basic film layer to form the UV coating mixed with nano-silica.

[0014] Furthermore, another feature of the present invention is that the 2-hydroxyethyl acrylate mixed with nano-silica is mixed as follows: after removing metal ions contained in the acidic silica sol by adsorption using a cation exchange resin, an organic solvent and a silane coupling agent are added and mixed to modify the mixture to make it hydrophobic, remove moisture, and concentrate the mixture; then, the mixture is surface-treated with a titanate coupling agent; and then, the mixture is mixed with 2-hydroxyethyl acrylate and the surfaces of the silica sol particles are coated with 2-hydroxyethyl acrylate to achieve hybridization.

[0015] According to the present invention as described above, a wood flooring board is provided, which is a laminate of a wood flooring substrate layer, a decorative film layer, and a UV coating film layer. The wood flooring substrate layer is made by mixing stone powder and an adhesive in a certain ratio, thereby improving water resistance and durability. The decorative film layer having a variety of textures and colors can enhance the aesthetics. A UV coating film having a UV coating mixed with nano-silicon dioxide is attached to the top layer of the wood flooring board to form a UV coating film layer. Therefore, when the wood flooring is used and contacts external objects, the scratch resistance and surface hardness can be improved, thereby providing a wood flooring board with aesthetics, water resistance, durability, chemical resistance, scratch resistance, and stain resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic perspective view showing an exploded state of the wooden flooring board according to the present invention.

[0017] Description of Reference Numerals

[0018] 1: Wooden flooring

[0019] 2: Wood floor substrate layer

[0020] 3: Insertion protrusion

[0021] 4: Slot

[0022] 5: Sound-absorbing material layer

[0023] 6: Decorative film layer

[0024] 7: UV coating film DETAILED DESCRIPTION

[0025] The configuration of the present invention will be described in detail below.

[0026] The wood flooring board 1 of the present invention is used for finishing the floor of a building and provides aesthetics, water resistance, durability, chemical resistance, scratch resistance, stain resistance, such as Figure 1 As shown, it includes: a wooden floor substrate layer 2, which is formed in a plate shape and constitutes the basic skeleton of the wooden floor board 1; a decorative film layer 6, which is laminated to the upper surface of the wooden floor substrate layer 2 to provide an aesthetic feeling with a variety of textures and colors; a UV coating film layer 7, which is a film-shaped film with a UV coating mixed with nano-silicon dioxide formed on the upper surface for the purpose of having scratch resistance and stain resistance, and is laminated on the upper surface of the decorative film layer 6 to form the uppermost layer of the wooden floor board 1.

[0027] The wooden floor substrate layer 2 is formed in a plate shape and constitutes the basic skeleton of the wooden floor board 1. In order to allow the wooden floor substrate layer 2 and the wooden floor substrate layers formed on other wooden floor boards to be inserted and combined with each other, an insertion protrusion 3 is protrudingly formed on one side of the edge surface of the wooden floor substrate layer 2, and a slot 4 is formed on the other side to accommodate the insertion protrusion 3 for insertion and combination, so that the wooden floor boards can be combined with each other in an insertion manner on a plane.

[0028] Furthermore, the wood floor substrate layer 2 is formed to a thickness of about 4 to 10 mm and is formed by mixing 70 to 90 parts by weight of stone powder and 10 to 30 parts by weight of an adhesive to improve water resistance and durability.

[0029] On the other hand, a sound-absorbing material layer 5 made of irradiation crosslinked polyethylene foam (IXPE) with a thickness of 1 to 2 mm can be attached to the lower surface of the wooden floor substrate layer 2 to improve the sound absorption of the wooden floor board 1 and reduce interlayer noise.

[0030] The decorative film layer 6 is bonded to the upper surface of the wooden floor substrate layer 2 by lamination treatment, so that the wooden floor board 1 has a variety of textures and colors to provide an aesthetic feeling. The decorative film layer 6 is printed with tree grain textures on a synthetic resin material film such as PVC to finish in a way that looks like a natural tree.

[0031] The UV coating film layer 7 is a film morphological element that imparts scratch resistance and stain resistance to the wood flooring board. It is bonded to the upper surface of the decorative film layer 6 by lamination treatment to form the top layer of the wood flooring board 1. It is composed of a basic film layer and a UV coating mixed with nano-silica.

[0032] The UV coating mixed with nano-silicon dioxide is formed by coating the upper surface of the basic film layer with a UV coating liquid, wherein the UV coating liquid is a coating liquid made of polyurethane acrylate resin as a base resin.

[0033] Preferably, the basic film layer constituting the UV coating film layer 7 is formed of a PVC material with a thickness of 0.08 to 0.5 mm.

[0034] Furthermore, the UV coating liquid used to form the UV coating layer 7 mixed with nano-silica is a coating liquid made of a polyurethane acrylate resin as a base resin, and is manufactured through a base resin manufacturing step and a UV coating liquid manufacturing step. Therefore, the prepared UV coating liquid is applied to the upper surface of the base film layer and UV-cured to form the UV coating layer mixed with nano-silica.

[0035] The process of preparing the UV coating liquid and the process of forming the UV coating layer on the upper surface of the base film layer using the prepared UV coating liquid will be described in detail below according to each step.

[0036] 1. Base resin manufacturing steps

[0037] First, the base resin manufacturing step is a process of adding polyester polyol, isophorone diisocyanate (IPDI), 2-hydroxyethyl acrylate mixed with nano-silica, and other additives and then mixing them to produce a polyurethane acrylate resin as the base resin of the UV coating liquid.

[0038] The polyester polyol is used to improve the tensile strength, elongation, and toughness of UV coatings. It is produced by condensing 200-250 parts by weight of adipic acid, 55-75 parts by weight of propylene glycol, 80-96 parts by weight of diethylene glycol, and 70-90 parts by weight of 1,6-hexanediol. As a catalyst for the condensation reaction, 0.3-0.6 parts by weight of Fascat 4100 from PMC Corporation (USA) is added and mixed.

[0039] A polyurethane acrylate resin serving as a base resin is prepared by adding 280 to 350 parts by weight of isophorone diisocyanate, 520 to 630 parts by weight of 2-hydroxyethyl acrylate mixed with nano-silica, a certain amount of a viscosity modifier, a defoamer, a dispersant, a catalyst, and a surface conditioner (slip agent) to 400 to 520 parts by weight of the polyester polyol prepared as described above, and mixing the mixture.

[0040] On the other hand, 400 to 520 parts by weight of the polyester polyol is added and mixed with respect to the total weight of the polyurethane acrylate resin as the base resin. If the amount of polyester polyol added is less than 400 parts by weight, the tensile strength, elongation, and toughness of the UV coating are reduced, and if the amount added exceeds 520 parts by weight, the UV coating becomes excessively softened.

[0041] The isophorone diisocyanate is used as a displacement diisocyanate compound to improve the tensile strength, elongation, and toughness of the UV coating. 280 to 350 parts by weight of the isophorone diisocyanate is added and mixed with the polyurethane acrylate resin as the base resin. If the amount of isophorone diisocyanate added is less than 280 parts by weight, the polyurethane acrylate resin cannot be synthesized due to insufficient reactive groups. If the amount of isophorone diisocyanate added exceeds 350 parts by weight, the storage stability of the polyurethane acrylate resin will be impaired.

[0042] The 2-hydroxyethyl acrylate mixed with nano-silica is used as an aliphatic acrylate compound to improve the scratch resistance, surface hardness and UV curability of the UV coating. 520 to 630 parts by weight is added and mixed with the total weight of the polyurethane acrylate resin as the base resin. When the added amount of the 2-hydroxyethyl acrylate mixed with nano-silica is less than 520 parts by weight, the scratch resistance and durability are reduced. When the added amount exceeds 630 parts by weight, the UV coating will be easily peeled off from the basic film layer.

[0043] Moreover, the 2-hydroxyethyl acrylate mixed with nano-silica is prepared by the following steps:

[0044] Cationic exchange resin is used to adsorb and remove metal ions contained in the acidic silica sol;

[0045] An organic solvent and a silane coupling agent are added to the silica sol from which metal ions have been removed, and the mixture is modified to be hydrophobic.

[0046] After removing the water from the hydrophobic silica sol and concentrating it, the surface is treated with a titanate coupling agent.

[0047] The surface-treated silica sol and 2-hydroxyethyl acrylate are mixed and the surface of the silica sol particles is coated with 2-hydroxyethyl acrylate to form a hybrid.

[0048] The 2-hydroxyethyl acrylate mixed with nano-silica can improve the scratch resistance and durability of the UV coating by virtue of the silica component.

[0049] In particular, the acidic silica sol uses nanoparticles having an average particle diameter within a range of 10 to 20 nm.

[0050] During the manufacturing process of the polyurethane acrylate resin, other additives such as a certain amount of viscosity modifier, defoamer, dispersant, catalyst, and surface modifier (Slip agent) are added and mixed.

[0051] The viscosity modifier reduces viscosity during the reaction between the polyester polyol and isophorone diisocyanate, activating stirring and the reaction. It also improves the tensile strength, elongation, and hardness of the UV coating and exhibits UV curability. In the present invention, 100 to 150 parts by weight of 1,6-hexanediol diacrylate is added as a viscosity modifier relative to the total weight of the polyurethane acrylate resin and mixed. If the viscosity modifier is added in an amount less than 100 parts by weight, the viscosity is too high, hindering the smooth isocyanate or acrylate denaturation reaction and reducing the elongation and toughness of the UV coating. If the viscosity modifier is added in an amount exceeding 150 parts by weight, the UV coating becomes excessively soft and unusable. The defoamer is used to eliminate bubbles generated during stirring and the reaction. The defoamer is added in an amount of 0.007 to 0.01 parts by weight relative to the total weight of the polyurethane acrylate resin. The dispersant is added in an amount of 0.3 to 0.6 parts by weight relative to the total weight of the polyurethane acrylate resin.

[0052] 0.2 to 0.4 parts by weight of dibutyltin dilaurate as the isocyanate catalyst is added to the total weight of the urethane acrylate resin and mixed.

[0053] The surface conditioner (slip agent) is used to improve the anti-fouling property of the UV coating. 0.4 to 0.6 parts by weight of silicone acrylate as the surface conditioner is added to the total weight of the polyurethane acrylate resin and then mixed.

[0054] Furthermore, during the production of the polyurethane acrylate resin, 4 to 6 parts by weight of an organic solvent such as methanol is added to remove unreacted residual isocyanate to stabilize the polyurethane acrylate resin.

[0055] The specific manufacturing process of the polyurethane acrylate resin as the base resin is as follows.

[0056] First, 200-250 parts by weight of adipic acid, 55-75 parts by weight of propylene glycol, 80-96 parts by weight of diethylene glycol, 70-90 parts by weight of 1,6-hexanediol, and 0.3-0.6 parts by weight of a polyester polyol catalyst are added to a reaction vessel. The mixture is heated at 140-150° C. for 1-2 hours, the temperature is raised to 200-220° C., and then heated for 4-6 hours. A dehydration reaction is then carried out at 110-130° C. for 1.5-2.5 hours to produce a polyester polyol by a condensation reaction.

[0057] Next, 100-150 parts by weight of 1,6-hexanediol diacrylate as a viscosity modifier is added to 400-520 parts by weight of polyester polyol at room temperature. Then, 280-350 parts by weight of isophorone diisocyanate, 0.007-0.01 parts by weight of a defoamer, and 0.3-0.6 parts by weight of a dispersant are added and stirred. 0.2-0.4 parts by weight of dibutyltin dilaurate is added as an isocyanate catalyst, and an isocyanate denaturation reaction is carried out for 1.5-2.5 hours. Then, 520-630 parts by weight of 2-hydroxyethyl acrylate mixed with nanosilica, 0.4-0.6 parts by weight of silicone acrylate as a surface modifier, and 4-6 parts by weight of methanol as an organic solvent are added and mixed. The mixture is then subjected to an acrylate denaturation reaction for 1-2 hours to produce a polyurethane acrylate resin. The resulting polyurethane acrylate resin is used as the base resin for UV coating liquids.

[0058] 2. UV coating liquid manufacturing steps

[0059] A certain amount of viscosity modifier, defoamer, dispersant, matting agent, UV initiator, surface modifier (slip agent) and leveling agent are added to the polyurethane acrylate resin as the base resin produced in the base resin production step and mixed to prepare a UV coating liquid.

[0060] The UV coating liquid is prepared by adding and mixing 450-550 parts by weight of polyurethane acrylate resin as a base resin, 160-200 parts by weight of 1,6-hexanediol diacrylate as a viscosity modifier, 5-10 parts by weight of a defoaming agent, 4-8 parts by weight of a dispersant, 75-95 parts by weight of a matting agent for removing surface gloss, 70-90 parts by weight of a UV initiator for ultraviolet light curing, 5-9 parts by weight of silicone acrylate as a surface modifier for improving surface pollution resistance, and 3-5 parts by weight of a leveling agent for improving the smoothness of the UV coating liquid.

[0061] Furthermore, the UV coating solution may be further added with 30 to 40 parts by weight of polyethylene glycol diacrylate and mixed as needed to improve the toughness of the UV coating.

[0062] 3. UV coating generation steps

[0063] A UV coating liquid is coated on the upper surface of a basic film layer made of PVC material with a thickness of about 10 to 30 μm, and then irradiated with ultraviolet light for UV curing to form a UV coating mixed with nano-silicon dioxide.

[0064] As described above, a prototype of a wood flooring board 1 having a nano-hybrid UV coating according to the present invention was produced, and the water resistance, chemical resistance, heat resistance, stain resistance, wear resistance, and scratch resistance were measured. Three identical prototypes were used for each test, and each test was commissioned to the Korea Construction and Living Environment Testing Institute.

[0065] (1) Water resistance test

[0066] The weight of each test piece was measured before drying and after drying for 24 hours to obtain the moisture content. Each test piece was immersed in water at 20°C for 24 hours and the thickness change before and after immersion was measured to obtain the water absorption thickness expansion rate.

[0067] (2) Chemical resistance test

[0068] The acid resistance of each prototype was tested by immersing it in 5% acetic acid for 6 hours, then washing it with water and drying it for 24 hours, and then observing its deformation. The alkali resistance of each prototype was tested by immersing it in 1% sodium carbonate for 6 hours, then washing it with water and drying it for 24 hours, and then observing its deformation. The diluent resistance of each prototype was tested by immersing it in a general diluent for 6 hours, then washing it with water and drying it for 24 hours, and then observing its deformation.

[0069] (3) Heat resistance test

[0070] Each sample was placed in a heated container and kept at 80°C for 2 hours, followed by cooling at room temperature for 2 hours. This process was repeated 4 times to test heat resistance.

[0071] (4) Pollution resistance test

[0072] The surface of each test product was painted with black, red, and blue ink and crayon for 10 mm. After 4 hours, the surface was wiped with a wet cloth and visually inspected to see if there was any ink remaining.

[0073] (5) Wear resistance test

[0074] The surface wear resistance of each test product was measured using a Taber's Abration Resistance Test.

[0075] (6) Scratch resistance

[0076] For each test product, a constant load was applied to an indenter using a Clemens scratch hardness tester, and the minimum load at which scratches or flaws occurred on the coating surface was measured while gradually increasing the load.

[0077] (7) Test results

[0078] Table 1

[0079]

[0080] As shown in the test results in Table 1, the average moisture content of the wood flooring board 1 of the present invention is 0.43%, and the water absorption thickness expansion rate is 0.23%. Both the moisture content and the water absorption thickness expansion rate are low, indicating that it has excellent water resistance. The test results of acid resistance, alkali resistance, and diluent resistance show that no abnormalities occurred on the prototype, indicating that it has excellent chemical resistance.

[0081] Moreover, the test results of heat resistance and pollution resistance show that the prototype has no abnormalities and its heat resistance and pollution resistance are excellent, especially in terms of wear resistance. Its wear value and wear amount are both 0, while the scratch resistance is a low 3N. It can be seen that the UV coating mixed with nano-silica that forms the top surface layer of the wooden flooring board 1 of the present invention exhibits higher surface hardness, toughness and tensile strength, etc., so it can be seen that its scratch resistance and wear resistance are excellent.

[0082] The foregoing describes the embodiments of the present invention, but the scope of the present invention is not limited thereto. All modifications and changes that can be easily modified by a person having ordinary knowledge in the technical field to which the present invention belongs and are considered to be equivalent should be included.

[0083] Industrial applications

[0084] According to the present invention as described above, the present invention provides a wood flooring board having a wood flooring substrate layer, a decorative film layer and a UV coating film layer laminated thereon. The wood flooring substrate layer is made by mixing stone powder and an adhesive in a certain ratio, thereby improving water resistance and durability. The decorative film layer having a variety of textures and colors can enhance aesthetics. A UV coating film having a UV coating mixed with nano-silicon dioxide is attached to the top layer of the wood flooring board to form a UV coating film layer. Therefore, when the wood flooring is used and contacts external objects, the scratch resistance and surface hardness and other properties can be improved, thereby providing a wood flooring board having aesthetics, water resistance, durability, chemical resistance, scratch resistance and pollution resistance. Therefore, the wood flooring board has great industrial uses.

Claims

1. A wood flooring board formed with a nano hybrid UV coating, characterized in that: Wood flooring panels that are UV coated include: The wooden floor substrate layer (2) is formed in a plate shape and constitutes the basic skeleton of the wooden floor board (1); A decorative film layer (6) laminated to the upper surface of the wooden floor substrate layer (2) to provide an aesthetically pleasing aesthetic with diverse textures and colors; The UV coating film layer (7) is a film having a UV coating mixed with nano-silicon dioxide formed on the upper surface in order to have scratch resistance and stain resistance, and is laminated on the upper surface of the decorative film layer (6) to form the uppermost layer of the wooden floor board (1). The film-shaped UV coating layer (7) is composed of a basic film layer and a UV coating layer mixed with nano-silicon dioxide. The UV coating mixed with nano-silicon dioxide is formed by coating the upper surface of the basic film layer with UV coating liquid. The UV coating liquid is a coating liquid made of polyurethane acrylate resin as a base resin. The polyurethane acrylate resin as the base resin of the UV coating liquid is prepared by adding 400-520 parts by weight of polyester polyol, 280-350 parts by weight of isophorone diisocyanate, 520-630 parts by weight of 2-hydroxyethyl acrylate mixed with nano-silica, a viscosity modifier, a defoamer, a dispersant, a catalyst and a surface modifier and mixing them. The polyester polyol is prepared by condensing 200-250 parts by weight of adipic acid, 55-75 parts by weight of propylene glycol, 80-96 parts by weight of diethylene glycol and 70-90 parts by weight of 1,6-hexanediol.

2. The wood flooring board with a nano hybrid UV coating according to claim 1, characterized in that: The wooden floor substrate layer (2) is formed by mixing 70-90 parts by weight of stone powder and 10-30 parts by weight of adhesive.

3. The wood flooring board with a nano hybrid UV coating according to claim 1 or 2, characterized in that: A sound-absorbing material layer (5) with a thickness of 1-2 mm and made of irradiated cross-linked polyethylene foam is attached to the lower surface of the wooden floor substrate layer (2).

4. The wood flooring board with a nano hybrid UV coating according to claim 1, characterized in that: The 2-hydroxyethyl acrylate mixed with nano-silica is mixed as follows: After removing the metal ions contained in the acidic silica sol by adsorption using a cation exchange resin, an organic solvent and a silane coupling agent are added and mixed to modify the sol to be hydrophobic, remove the water, and concentrate the sol. The sol is then surface treated with a titanate coupling agent and mixed with 2-hydroxyethyl acrylate to coat the surface of the silica sol particles with 2-hydroxyethyl acrylate for hybridization.

5. The wood flooring board with a nano hybrid UV coating according to claim 1, characterized in that: The UV coating liquid is prepared by adding 450-550 parts by weight of polyurethane acrylate resin as a base resin, 160-200 parts by weight of 1,6-hexanediol diacrylate as a viscosity modifier, 5-10 parts by weight of a defoamer, 4-8 parts by weight of a dispersant, 75-95 parts by weight of a matting agent, 70-90 parts by weight of a UV initiator, 5-9 parts by weight of silicone acrylate as a surface modifier, and 3-5 parts by weight of a leveling agent, and then mixing.

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