Scratch-resistant UV-cured wood board and processing technology thereof

Abstract

The present invention relates to the technical field of scratch-resistant wood boards, specifically a scratch-resistant UV-cured wood board and its processing technology. The process comprises the following steps: S1: polishing the surface of a wood board substrate to a smooth surface, vacuum impregnating the substrate with an acrylate monomer solution, and drying the substrate to obtain a pretreated wood board; S2: modifying inorganic nanoparticles with a silane coupling agent to obtain modified inorganic nanoparticles; uniformly mixing the modified inorganic nanoparticles with epoxy acrylate, piperazine acrylate, piperidinyl acrylate, pentaerythritol triacrylate, and a photoinitiator to obtain a UV-cured paint; and S3: coating the pretreated substrate surface with the UV-cured paint and curing the paint in an inert atmosphere to obtain a scratch-resistant UV-cured wood board.

Description

Technical Field

[0001] The invention relates to the technical field of scratch-resistant wood boards, in particular to a scratch-resistant UV-cured wood board and a processing technology thereof. Background Art

[0002] UV-cured wood board is a decorative board whose surface is treated and protected by ultraviolet curing paint, thereby enhancing its chemical resistance, moisture resistance, and deformation resistance.

[0003] In the existing process, UV-cured wood boards have the following defects: (1) Low surface hardness; surface hardness is an important indicator for evaluating its physical damage resistance. Generally, the hardness needs to be above 2H to effectively resist physical defects such as scratches. However, the current UV-cured wood boards are generally 3H; therefore, the surface hardness of UV-cured wood boards still needs to be further improved. (2) The UV-curing paint used in UV-cured wood boards has the following problems: first, the light curing rate is fast, which leads to internal stress defects, thereby causing a decrease in mechanical properties; second, the presence of trace oxygen slows down the curing rate, resulting in partial curing and local deformation, leading to a decrease in physical properties; (3) The existing flame-retardant UV-curing paint has different properties between the flame retardant and the resin, resulting in poor dispersibility and compatibility, resulting in poor mechanical properties.

[0004] In summary, solving the above problems and preparing a UV-cured wood board with good flame retardancy and scratch resistance is of great value. Summary of the Invention

[0005] The object of the present invention is to provide a scratch-resistant UV-cured wood board and a processing technology thereof, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A processing technology for scratch-resistant UV-cured wood board includes the following process steps:

[0008] S1: polishing the surface of the wood substrate to be smooth, vacuum impregnating the substrate in an acrylate monomer solution, and drying the solution to obtain a pretreated wood substrate;

[0009] S2: using a silane coupling agent to modify inorganic nanoparticles to obtain modified inorganic nanoparticles; and uniformly mixing the modified inorganic nanoparticles with epoxy acrylate, piperazine acrylate, piperidinyl acrylate, pentaerythritol triacrylate, and a photoinitiator to obtain a UV curing paint;

[0010] S3: coating the surface of the pretreated substrate with UV curing paint and curing it under an inert atmosphere to obtain a scratch-resistant UV cured wood board.

[0011] More optimally, the acrylate monomer solution comprises the following components: by weight, 100 parts of ethanol, 0.5-1 parts of glycidyl acrylate, 1-1.5 parts of hydroxyethyl acrylate, 1-1.5 parts of dihydroeugenol acrylate, and 0.1-0.5 parts of thermal initiator.

[0012] More optimally, during the vacuum impregnation process: the pressure is -0.08 to -0.09 MPa, and the impregnation time is 2 to 4 hours; during the drying process: drying at 50 to 60° C. for 2 to 3 hours, and drying at 60 to 80° C. for 24 hours.

[0013] More optimally, the UV curing paint comprises the following components: by weight, 50 to 60 parts of epoxy acrylate, 17 to 20 parts of piperazine acrylate, 8 to 10 parts of piperidinyl acrylate, 10 to 12 parts of pentaerythritol triacrylate, 3 to 5 parts of inorganic nanoparticles, and 2 to 3 parts of photoinitiator; the silane coupling agent in the modified inorganic nanoparticles accounts for 4 to 5 wt% of the nanoparticles.

[0014] More optimally, the preparation method of the piperazinyl acrylate is as follows: anhydrous piperazine, glycidyl acrylate, and p-aminobenzenesulfonic acid are uniformly mixed, and the mixture is reacted at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperazine monomer; the piperazine monomer and triethylamine are uniformly mixed, and diphenyl chlorophosphate is added dropwise under a nitrogen atmosphere, and the mixture is reacted at room temperature for 4 to 5 hours, filtered to remove impurities, and the solution is rotary evaporated to remove the solvent to obtain piperazinyl acrylate;

[0015] The preparation method of the piperidinyl acrylate comprises the following steps: uniformly mixing piperidine, glycidyl acrylate, and p-aminobenzenesulfonic acid, reacting the mixture at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperidine monomer; uniformly mixing cystamine diisocyanate in anhydrous toluene, heating the mixture to 70-80° C. under a nitrogen atmosphere, adding an organic tin-toluene solution, dropwise adding a piperidine monomer-toluene solution, reacting the mixture for 2-3 hours, and performing post-treatment to obtain the piperidinyl acrylate.

[0016] More optimally, the wood board substrate is Australian pine board; the inorganic nanoparticles include but are not limited to one or more of nano zinc dioxide, nano silicon dioxide, and nano titanium dioxide; the silane coupling agent is a silane coupling agent containing unsaturated functions, including but not limited to one or more of methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, and allyltriethoxysilane; and the photoinitiator is a TPO-type photoinitiator.

[0017] More optimally, the raw materials of the piperazine acrylate include the following components: 15 parts of piperazine monomer, 3 to 3.5 parts of triethylamine, and 24 to 28 parts of diphenyl chlorophosphate, by weight; the piperazine monomer includes the following raw materials: 4.8 to 5.3 parts of anhydrous piperazine, 14 to 16 parts of glycidyl acrylate, and 0.5 to 0.8 parts of p-aminobenzenesulfonic acid, by weight.

[0018] More optimally, the raw materials of the piperidinyl acrylate include the following components: by weight; 5 parts of cystamine diisocyanate, 0.05-0.08 parts of organotin, and 5.5-5.8 parts of piperidine monomer; the piperidine monomer includes the following raw materials: by weight; 4.8-5.3 parts of piperidine, 7-8 parts of glycidyl acrylate, and 0.5-0.8 parts of p-aminobenzenesulfonic acid.

[0019] More optimally, the coating thickness of the UV curing paint is 0.3-0.4 mm; during the curing process of the UV curing paint, dual lamp curing is used, and the xenon lamp curing light intensity is 100-150 mW / cm 2 , the light intensity of the high-pressure mercury lamp is 90-100mW / cm 2 ; The curing time is 1 to 2 minutes.

[0020] More optimally, a scratch-resistant UV-cured wood board processing process is used to obtain a scratch-resistant UV-cured wood board.

[0021] Compared with the prior art, the beneficial effects are as follows:

[0022] (1) The scheme uses an acrylate monomer solution for vacuum impregnation. In this solution, the acrylic monomers include glycidyl acrylate and hydroxyethyl acrylate, which have smaller molecular structures and are more soluble in the cell wall structure of the wood board than UV curing paint, and can produce an interfacial effect with it, thereby improving the strength of the wood board; at the same time, it contains dihydroeugenol acrylate, whose structure is similar to the lignin structure in the wood board, which promotes the impregnation property; in addition, the acrylate monomer solution contains a thermal initiator, which can be cross-linked in the wood board during the drying process, and the unreacted groups can be photocross-linked with the UV curing paint on the surface, thereby improving the interfacial effect.

[0023] In the (2) scheme, two acrylate monomers (piperazinyl acrylate and piperidinyl acrylate) were prepared based on piperazine and piperidine. These two acrylate monomers were mixed with pentaerythritol triacrylate to form a diluent, and then mixed with epoxy acrylate to form the main body of the UV curing paint. Modified inorganic nanoparticles and photoinitiators were then introduced to form the UV curing paint. This effectively enhanced the flame retardancy while improving the surface properties.

[0024] Piperazine acrylate is first grafted with glycidyl acrylate by reacting amino groups with epoxy groups, and then grafted with diphenyl chlorophosphate by reacting the hydroxyl groups formed by the grafting reaction with chlorine, thereby forming a flame-retardant piperazine acrylate. The grafting of diphenyl chlorophosphate not only increases flame retardancy, but also increases affinity with epoxy acrylate due to the phenyl group it contains, and enhances rigidity and improves wear resistance.

[0025] Among them, piperidinyl acrylate is firstly formed by reacting amino groups with epoxy groups to graft glycidyl acrylate, and then the hydroxyl groups formed by the grafting reaction are reacted with isocyanate to graft the piperidinyl monomer onto both ends of cystamine diisocyanate, thereby forming a piperidinyl acrylate with a disulfide bond; wherein, piperidinyl acrylate is also flame retardant and can assist in synergizing piperazinyl acrylate to enhance flame retardancy; and the disulfide bond contained is a reversible bond, which can help enhance chain breaking movement and cause cross-linking reformation, thereby reducing the internal stress of UV curing and improving the surface mechanical properties.

[0026] (3) The scheme limits the type and content of photoinitiators. The reason is that the type and content of photoinitiators have a certain impact on the surface hardness. Compared with photoinitiators such as Irgacure500, TPO initiators have better introduction and photocuring performance. Regarding the content, in general, in order to enhance the efficiency of photocuring, a larger amount of photoinitiator is introduced. However, introducing too much will result in a shorter polymer matrix chain length, resulting in lower hardness. In addition, the residual photoinitiator will produce side effects such as yellowing and degradation.

[0027] Of course, when the photoinitiator content is low, it may affect the photocuring rate, resulting in poor curing performance. Therefore, in this scheme, tertiary amines of piperazine acrylate and piperidinyl acrylate are used to effectively enhance the efficiency of photoinitiated polymerization and make up for the disadvantage of low photoinitiator content. At the same time, dual-lamp curing and inert gas curing atmosphere are used to effectively suppress the effect of trace oxygen, thereby improving photocuring performance, suppressing defects, and improving surface performance. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] It should be noted that the purchase manufacturers of all raw materials involved in the present invention are exemplified without any special restrictions: the following parts are by mass; anhydrous piperazine (CAS: 110-85-0), piperidine (CAS: 110-89-4), diphenyl chlorophosphate (CAS: 2524-64-3), glycidyl acrylate (CAS: 106-90-1), p-aminobenzenesulfonic acid (CAS: 121-57-3), hydroxyethyl acrylate (CAS: 818-61-1), epoxy acrylate (brand is Jusheng, product number is JS7516), pentaerythritol triacrylate (CAS: 3524-68-3), TPO photoinitiator (Chivacure TPO photoinitiator, provided by Shanghai Puzhan Industrial Co., Ltd.); Preparation of dihydroeugenol acrylate: 5 parts of dihydroeugenol, 0.8 parts of triethylamine, and 0.003 parts of p-hydroxyanisole were added sequentially to 10 parts of THF and mixed uniformly. 2.7 parts of acryloyl chloride were added dropwise under an ice bath, and the mixture was reacted at 40°C for 5 hours, followed by post-treatment to obtain dihydroeugenol acrylate; Preparation of cystamine diisocyanate: 9 parts of triphosgene were introduced into 50 parts of anhydrous dichloromethane to obtain reaction solution A; 11 parts of cystamine dihydrochloride and 23 parts of pyridine were added to 150 parts of anhydrous dichloromethane, and reaction solution A was added dropwise under an ice bath; after the addition was completed, the mixture was reacted at -10°C for 6 hours, extracted, and dried to obtain cystamine diisocyanate.

[0030] Example 1: A process for producing a scratch-resistant UV-cured wood board, comprising the following steps:

[0031] S1: (1) 0.6 parts of glycidyl acrylate, 1.4 parts of hydroxyethyl acrylate, 1.5 parts of dihydroeugenol acrylate, and 0.3 parts of azobisisobutyronitrile were added to 100 parts of ethanol in sequence and mixed evenly to obtain an acrylate monomer solution; (2) the surface of the Australian pine board was polished smooth and vacuum impregnated in the acrylate monomer solution: the pressure was -0.0859 MPa, and the impregnation time was 3 hours; drying: drying at 60°C for 2 hours and drying at 80°C for 24 hours to obtain a pretreated wood board;

[0032] S2: (1) The preparation method of the piperazine acrylate is as follows: 5 parts of anhydrous piperazine, 15 parts of glycidyl acrylate, and 0.6 parts of p-aminobenzenesulfonic acid are mixed evenly, and the mixture is reacted at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperazine monomer; 15 parts of piperazine monomer and 3.2 parts of triethylamine are mixed evenly, and 26 parts of diphenyl chlorophosphate are added dropwise under a nitrogen atmosphere to react at room temperature for 4 to 5 hours, the mixture is filtered to remove impurities, and the solvent is removed by rotary evaporation to obtain piperazine acrylate;

[0033] (2) The preparation method of the piperidinyl acrylate is as follows: 5 parts of piperidine, 7.5 parts of glycidyl acrylate, and 0.6 parts of p-aminobenzenesulfonic acid are mixed uniformly, and reacted at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperidinyl acrylate; 5 parts of cystamine diisocyanate are added to 50 parts of anhydrous toluene and mixed uniformly, and heated to 80° C. under a nitrogen atmosphere, and an organic tin-toluene solution (0.08 parts of dibutyltin dilaurate, 10 parts of toluene) is added, and a piperidinyl acrylate monomer-toluene solution (5.6 parts, 20 parts of toluene) is added dropwise, and reacted for 3 hours, and post-treated to obtain piperidinyl acrylate;

[0034] (3) Dispersing 5 parts of nano zinc oxide and methacryloyloxypropyltrimethoxysilane (accounting for 5 wt% of the nanoparticles) in 150 parts of anhydrous toluene, ultrasonically dispersing the mixture evenly, adding reflux for 2 hours, cooling and centrifuging to obtain modified nanoparticles;

[0035] (4) the modified nanoparticles were mixed with 54.5 parts of epoxy acrylate, 18 parts of piperazinyl acrylate, 10 parts of piperidinyl acrylate, 10 parts of pentaerythritol triacrylate, and 2.5 parts of TPO photoinitiator to obtain a UV curing paint;

[0036] S3: UV curing paint is applied to the surface of the pre-treated substrate with a coating thickness of 0.35 mm. In a nitrogen atmosphere, a double lamp is used for curing. The xenon lamp curing light intensity is 120 mW / cm 2 , the light intensity of the high-pressure mercury lamp is 100mW / cm 2 ; Curing time is 80 seconds; obtain scratch-resistant UV cured wood board.

[0037] Example 2:

[0038] S1: (1) 0.5 parts of glycidyl acrylate, 1.5 parts of hydroxyethyl acrylate, 1 part of dihydroeugenol acrylate, and 0.3 parts of azobisisobutyronitrile were added to 100 parts of ethanol in sequence and mixed evenly to obtain an acrylate monomer solution; (2) the surface of the Australian pine board was polished smooth and vacuum impregnated in the acrylate monomer solution at a pressure of -0.0859 MPa for 3 hours; and dried at 60°C for 2 hours and at 80°C for 24 hours to obtain a pretreated wood board;

[0039] S2: (1) The preparation method of the piperazine acrylate is as follows: 5 parts of anhydrous piperazine, 15 parts of glycidyl acrylate, and 0.6 parts of p-aminobenzenesulfonic acid are mixed evenly, and the mixture is reacted at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperazine monomer; 15 parts of piperazine monomer and 3.2 parts of triethylamine are mixed evenly, and 26 parts of diphenyl chlorophosphate are added dropwise under a nitrogen atmosphere to react at room temperature for 4 to 5 hours, the mixture is filtered to remove impurities, and the solvent is removed by rotary evaporation to obtain piperazine acrylate;

[0040] (2) The preparation method of the piperidinyl acrylate is as follows: 5 parts of piperidine, 7.5 parts of glycidyl acrylate, and 0.6 parts of p-aminobenzenesulfonic acid are mixed uniformly, and reacted at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperidinyl acrylate; 5 parts of cystamine diisocyanate are added to 50 parts of anhydrous toluene and mixed uniformly, and heated to 80° C. under a nitrogen atmosphere, and an organic tin-toluene solution (0.08 parts of dibutyltin dilaurate, 10 parts of toluene) is added, and a piperidinyl acrylate monomer-toluene solution (5.6 parts, 20 parts of toluene) is added dropwise, and reacted for 3 hours, and post-treated to obtain piperidinyl acrylate;

[0041] (3) Dispersing 4 parts of nano zinc oxide and methacryloyloxypropyltrimethoxysilane (accounting for 5 wt% of the nanoparticles) in 150 parts of anhydrous toluene, ultrasonically dispersing the mixture evenly, adding reflux for 2 hours, cooling and centrifuging to obtain modified nanoparticles;

[0042] (4) the modified nanoparticles were mixed with 52 parts of epoxy acrylate, 20 parts of piperazinyl acrylate, 10 parts of piperidinyl acrylate, 12 parts of pentaerythritol triacrylate, and 2 parts of TPO photoinitiator to obtain a UV curing paint;

[0043] S3: UV curing paint is applied to the surface of the pre-treated substrate with a coating thickness of 0.35 mm. In a nitrogen atmosphere, a double lamp is used for curing. The xenon lamp curing light intensity is 120 mW / cm 2 , the light intensity of the high-pressure mercury lamp is 100mW / cm 2 ; Curing time is 80 seconds; obtain scratch-resistant UV cured wood board.

[0044] Example 3:

[0045] S1: (1) 1 part of glycidyl acrylate, 1 part of hydroxyethyl acrylate, 1 part of dihydroeugenol acrylate, and 0.3 part of azobisisobutyronitrile were added to 100 parts of ethanol in sequence and mixed evenly to obtain an acrylate monomer solution; (2) the surface of the Australian pine board was polished smooth, and vacuum impregnated in the acrylate monomer solution at a pressure of -0.0859 MPa for 3 hours; and dried at 60°C for 2 hours and at 80°C for 24 hours to obtain a pretreated wood board;

[0046] S2: (1) The preparation method of the piperazine acrylate is as follows: 5 parts of anhydrous piperazine, 15 parts of glycidyl acrylate, and 0.6 parts of p-aminobenzenesulfonic acid are mixed evenly, and the mixture is reacted at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperazine monomer; 15 parts of piperazine monomer and 3.2 parts of triethylamine are mixed evenly, and 26 parts of diphenyl chlorophosphate are added dropwise under a nitrogen atmosphere to react at room temperature for 4 to 5 hours, the mixture is filtered to remove impurities, and the solvent is removed by rotary evaporation to obtain piperazine acrylate;

[0047] (2) The preparation method of the piperidinyl acrylate is as follows: 5 parts of piperidine, 7.5 parts of glycidyl acrylate, and 0.6 parts of p-aminobenzenesulfonic acid are mixed uniformly, and reacted at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperidinyl acrylate; 5 parts of cystamine diisocyanate are added to 50 parts of anhydrous toluene and mixed uniformly, and heated to 80° C. under a nitrogen atmosphere, and an organic tin-toluene solution (0.08 parts of dibutyltin dilaurate, 10 parts of toluene) is added, and a piperidinyl acrylate monomer-toluene solution (5.6 parts, 20 parts of toluene) is added dropwise, and reacted for 3 hours, and post-treated to obtain piperidinyl acrylate;

[0048] (3) Dispersing 3 parts of nano zinc oxide and methacryloyloxypropyltrimethoxysilane (accounting for 5 wt% of the nanoparticles) in 150 parts of anhydrous toluene, ultrasonically dispersing the mixture evenly, adding reflux for 2 hours, cooling and centrifuging to obtain modified nanoparticles;

[0049] (4) the modified nanoparticles were mixed with 59 parts of epoxy acrylate, 17 parts of piperazinyl acrylate, 8 parts of piperidinyl acrylate, 10 parts of pentaerythritol triacrylate, and 3 parts of TPO photoinitiator to obtain a UV curing paint;

[0050] S3: UV curing paint is applied to the surface of the pre-treated substrate with a coating thickness of 0.35 mm. In a nitrogen atmosphere, a double lamp is used for curing. The xenon lamp curing light intensity is 120 mW / cm 2 , the light intensity of the high-pressure mercury lamp is 100mW / cm 2 ; Curing time is 80 seconds; obtain scratch-resistant UV cured wood board.

[0051] Comparative Example 1: Cystamine diisocyanate was replaced with 1,6-hexamethylene diisocyanate, and the remaining steps were the same as in Example 1.

[0052] Comparative Example 2: piperazinyl acrylate was replaced by 1,6-hexanediol diacrylate; piperidinyl acrylate was replaced by triethylene glycol diacrylate; the remaining steps were the same as in Example 1.

[0053] Comparative Example 3: The mass parts of piperazinyl acrylate and piperidinyl acrylate were exchanged, and the remaining steps were the same as in Example 1.

[0054] Comparative Example 4: The photoinitiator was replaced with Irgacure 500, and the remaining steps were the same as in Example 1.

[0055] Performance Test 1: The scratch-resistant UV wood panels prepared in the Examples and Comparative Examples were scratched five times at a 40° angle, with a vertical pressure of 1 kg, over a length of 3 cm, according to the method in GB / T 15036.2. If no scratches were left on the surface, the surface hardness was determined. The UV-curable paints prepared in the Examples and Comparative Examples were cured to form a film, and the limiting oxygen index (LOI) was measured according to ASTM D2863 to determine flame retardancy. The data are shown in the following table:

[0056] Surface hardness LOI (%) Example 1 5H 33.2 Example 2 5H 32.4 Example 3 4H 31.3 Comparative Example 1 4H 30.8 Comparative Example 2 3H 23.5 Comparative Example 3 4H 28.9 Comparative Example 4 4H 33.1

[0057] Performance Test 2: The scratch-resistant UV wood board prepared in Example 1 was subjected to a 5N force and abrasion for 100 seconds using a paint film abrasion instrument, as per the method in GB / T 15036.2. The abrasion value was 34 mg, indicating excellent wear resistance.

[0058] Conclusion: From the data of Example 1, it can be seen that: in this application, Australian pine board is used as the base material, the surface is coated with UV curing paint, and after double-lamp curing, a scratch-resistant UV-cured wood board with a smooth and bright surface is obtained. The color is long-lasting and the paint does not fall off, and the surface hardness is high, wear-resistant and scratch-resistant, and durable. At the same time, the surface paint film has good flame retardancy, which can increase the safety of application. Comparing the data of Example 1 with the data of Comparative Examples 1 to 4, it can be seen that: in Comparative Example 1, since cystamine diisocyanate is replaced with 1,6-hexamethylene diisocyanate, stress defects are increased, thereby causing the surface performance to decline; in Comparative Example 2, since piperazine acrylate and piperazine acrylate are not introduced, all properties are greatly reduced; in Comparative Example 3, since the mass parts of piperazine acrylate and piperidinyl acrylate are interchanged, the surface hardness and flame retardancy are reduced; in Comparative Example 4, since the photoinitiator is changed to Irgacure500, the surface performance is significantly reduced.

[0059] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A process for producing a scratch-resistant UV-cured wood board, characterized by: The process includes the following: S1: The surface of the wood substrate was polished smooth and then vacuum impregnated in an acrylate monomer solution; drying to obtain a pretreated wood board; S2: using a silane coupling agent to modify inorganic nanoparticles to obtain modified inorganic nanoparticles; and uniformly mixing the modified inorganic nanoparticles with epoxy acrylate, piperazine acrylate, piperidinyl acrylate, pentaerythritol triacrylate, and a photoinitiator to obtain a UV curing paint; S3: coating the surface of the pretreated substrate with UV curing paint and curing it under an inert atmosphere to obtain a scratch-resistant UV cured wood board.

2. The process for processing a scratch-resistant UV-cured wood board according to claim 1, characterized in that: The acrylic acid ester monomer solution comprises the following components: by weight, 100 parts of ethanol, 0.5 to 1 parts of glycidyl acrylate, 1 to 1.5 parts of hydroxyethyl acrylate, 1 to 1.5 parts of dihydroeugenol acrylate, and 0.1 to 0.5 parts of a thermal initiator.

3. The process for processing a scratch-resistant UV-cured wood board according to claim 1, characterized in that: During the vacuum impregnation process: the pressure is -0.08 to -0.09 MPa, and the impregnation time is 2 to 4 hours; during the drying process: drying at 50 to 60° C. for 2 to 3 hours, and drying at 60 to 80° C. for 24 hours.

4. The process for processing a scratch-resistant UV-cured wood board according to claim 1, characterized in that: The UV curing paint comprises the following components: by weight, 50 to 60 parts of epoxy acrylate, 17 to 20 parts of piperazine acrylate, 8 to 10 parts of piperidinyl acrylate, 10 to 12 parts of pentaerythritol triacrylate, 3 to 5 parts of inorganic nanoparticles, and 2 to 3 parts of photoinitiator; the silane coupling agent in the modified inorganic nanoparticles accounts for 4 to 5 wt% of the nanoparticles.

5. The process for processing a scratch-resistant UV-cured wood board according to claim 4, characterized in that: The preparation method of the piperazinyl acrylate comprises: uniformly mixing anhydrous piperazine, glycidyl acrylate, and p-aminobenzenesulfonic acid, reacting the mixture at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperazine monomer; uniformly mixing the piperazine monomer and triethylamine, dropwise adding diphenyl chlorophosphate under a nitrogen atmosphere, reacting the mixture at room temperature for 4 to 5 hours, filtering to remove impurities, and rotary evaporating the solution to remove the solvent to obtain the piperazinyl acrylate; The preparation method of the piperidinyl acrylate comprises the following steps: uniformly mixing piperidine, glycidyl acrylate, and p-aminobenzenesulfonic acid, reacting the mixture at room temperature for 24 hours under a nitrogen atmosphere to obtain a piperidine monomer; uniformly mixing cystamine diisocyanate in anhydrous toluene, heating the mixture to 70-80° C. under a nitrogen atmosphere, adding an organic tin-toluene solution, dropwise adding a piperidine monomer-toluene solution, reacting the mixture for 2-3 hours, and performing post-treatment to obtain the piperidinyl acrylate.

6. The process for processing a scratch-resistant UV-cured wood board according to claim 1, characterized in that: The wood board substrate is Australian pine board; the inorganic nanoparticles include one or more of nano zinc dioxide, nano silicon dioxide, and nano titanium dioxide; the silane coupling agent is a silane coupling agent containing unsaturated functions, including one or more of methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, and allyltriethoxysilane; and the photoinitiator is a TPO-type photoinitiator.

7. The process for processing a scratch-resistant UV-cured wood board according to claim 5, characterized in that: The raw materials of the piperazine acrylate include the following components: 15 parts of piperazine monomer, 3 to 3.5 parts of triethylamine, and 24 to 28 parts of diphenyl chlorophosphate, calculated by weight; the piperazine monomer includes the following raw materials: 4.8 to 5.3 parts of anhydrous piperazine, 14 to 16 parts of glycidyl acrylate, and 0.5 to 0.8 parts of p-aminobenzenesulfonic acid, calculated by weight.

8. The process for processing a scratch-resistant UV-cured wood board according to claim 5, characterized in that: The raw materials of the piperidinyl acrylate include the following components: in parts by weight; 5 parts of cystamine diisocyanate, 0.05-0.08 parts of organotin, 5.5-5.8 parts of piperidine monomer; the piperidine monomer includes the following raw materials: calculated by weight; 4.8-5.3 parts of piperidine, 7-8 parts of glycidyl acrylate, and 0.5-0.8 parts of p-aminobenzenesulfonic acid.

9. The process for processing a scratch-resistant UV-cured wood board according to claim 5, characterized in that: The coating thickness of the UV curing paint is 0.3-0.4 mm; during the curing process of the UV curing paint, dual lamp curing is used, and the xenon lamp curing light intensity is 100-150 mW / cm 2 , the light intensity of the high-pressure mercury lamp is 90-100mW / cm 2 ; The curing time is 1 to 2 minutes.

10. The scratch-resistant UV-cured wood board obtained by the processing process of the scratch-resistant UV-cured wood board according to any one of claims 1 to 9.