High-strength wood floor and method for manufacturing the same

Abstract

The application discloses high-strength wood floor, which is assembled from bottom to top by balance layer, floor glue, base material, floor glue, decorative layer, floor glue and wear-resistant layer in sequence. The base layer is a composite material made of wood powder, modified wood powder, polyethylene and modified calcium carbonate whisker. The modified wood powder can graft polyethylene and complement the mechanical properties of polyethylene. The modified calcium carbonate whisker can absorb the modified wood powder and has high mechanical properties itself. The wear-resistant layer is made of modified filler as the curing agent and crosslinking agent of phenolic epoxy resin. The modified filler introduces a large amount of aluminum oxide to increase the wear resistance of the wear-resistant layer. The modified filler is difficult to separate from the wear-resistant layer through the reaction mode, which not only improves the wear resistance of the wear-resistant layer, but also improves the service life of the wear-resistant layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wood floor preparation, and particularly relates to a preparation method of high-strength wood floor. BACKGROUND

[0002] Wood floor is an indispensable building material in home, which not only has a good decorative effect, but also can play a sound insulation, heat insulation, humidity regulation, warm in winter and cool in summer effect. Traditional solid wood floor has problems such as difficult maintenance, high requirements for paving, etc. Once the paving is not good, a series of problems such as sound will be caused. If the indoor environment is too humid or dry, the solid wood floor is easy to arch, warp or deform. After paving, it needs to be frequently waxed and oiled, otherwise the gloss on the surface of the floor will soon disappear. The price is expensive, and the solid wood floor has always been at a high price. As a decoration, the floor needs to have good mechanical properties to ensure that it will not deform during use. The floor will be worn during use, affecting the appearance of the floor, and increasing the wear resistance of the floor can reduce the wear of the floor. Composite floor not only has good mechanical properties and wear resistance, but also uses less solid wood, and is more economical and environmentally friendly. The trend of replacing wood floor with composite wood floor is irreversible. SUMMARY

[0003] The purpose of the present application is to provide a preparation method of high-strength wood floor, which solves the problem of low strength of current wood floor.

[0004] The purpose of the present application can be achieved by the following technical solutions:

[0005] A preparation method of high-strength wood floor, the specific steps are as follows:

[0006] Step S1: disperse wood powder in ethanol, add styrene ethyl trimethoxysilane and deionized water, and react for 1-2h under the condition of rotation speed of 120-150rpm and temperature of 50-60℃, to obtain modified wood powder; disperse calcium carbonate whisker in ethanol, add KH580 and deionized water, and react for 2-3h under the condition of rotation speed of 120-150rpm and temperature of 50-60℃, to obtain modified calcium carbonate whisker.

[0007] Step S2: add wood powder, modified wood powder, polyethylene, modified calcium carbonate whisker and benzoyl peroxide into a double screw extruder, and extrude under the condition of rotation speed of 150-180rpm and temperature of 200-220℃, to obtain a pretreated substrate; irradiate the pretreated substrate with 395nm ultraviolet light for 5-10min, to obtain a substrate.

[0008] Step S3: uniformly mix stearic acid, deionized water, KH792 and tetraethyl orthosilicate, stir for 2-3h at a rotation speed of 150-180rpm and a temperature of 25-30℃, remove the filtrate, calcine the filter cake at a temperature of 540-560℃ for 2-3h, and obtain the precursor.

[0009] Step S4: uniformly mix the precursor, aluminum nitrate solution and deionized water, stir for 2-3h at a rotation speed of 150-180rpm and a temperature of 25-30℃, remove the filtrate, calcine the filter cake at a temperature of 450-480℃ for 3-5h, and obtain the filler.

[0010] Step S5: disperse the filler in tetrahydrofuran, add deionized water and KH550, stir for 1-2h at a rotation speed of 100-120rpm and a temperature of 30-40℃, remove the filtrate, obtain the modified filler, disperse the modified filler in the phenolic epoxy resin, stir for 10-15min at a rotation speed of 100-120rpm and a temperature of 20-25℃, and stand for 3-5h for curing reaction, and obtain the wear-resistant layer.

[0011] Step S6: assemble the composite floor in the order of balance layer, floor glue, base material, floor glue, decorative layer, floor glue and wear-resistant layer from bottom to top, hot-press at a temperature rising speed of 3-5℃ / min, a pressure rising rate of 60-70kPa / min, a hot-press temperature of 80-90℃ and a hot-press pressure of 60-70kPa, and keep the temperature and pressure for 70-80min, and obtain the high-strength wooden floor.

[0012] Further, the amount ratio of the wood powder, ethanol, styrene ethyl trimethoxysilane and deionized water in step S1 is 1g:20mL:10mL:30mL, and the amount ratio of the calcium carbonate whisker, ethanol, KH580 and deionized water is 1g:20mL:10mL:30mL.

[0013] Further, the weight ratio of the wood powder, modified wood powder, polyethylene, modified calcium carbonate whisker and benzoyl peroxide in step S2 is 40:20:40:10:3, the wood powder is 50-mesh wood powder, and the polyethylene is polyethylene 80000.

[0014] Further, the amount ratio of the stearic acid, deionized water, KH792 and tetraethyl orthosilicate in step S3 is 1g:40mL:1mL:10mL.

[0015] Further, the amount ratio of the precursor, aluminum nitrate solution and deionized water in step S4 is 4g:20mL:30mL, and the mass fraction of the aluminum nitrate solution is 15%.

[0016] Further, the amount ratio of the filler, tetrahydrofuran, deionized water and KH570 in step S5 is 1g:20mL:10mL:30mL, and the amount ratio of the modified filler and the phenolic epoxy resin is 1g:10mL, the phenolic epoxy resin is bisphenol A type phenolic epoxy resin, the resin epoxy equivalent weight is 180-190g / eq, and the viscosity is 9000-11000mPa·S (25℃).

[0017] Further, the balance layer in step S6 is melamine resin impregnated paper, the floor glue is PVC floor glue, and the decorative layer is melamine resin decorative paper, the thickness of the balance layer is 2-3mm, the thickness of the substrate is 4-6mm, the thickness of the decorative layer is 1-2mm, and the thickness of the wear-resistant layer is 0.4-0.6mm.

[0018] The beneficial effects of the present application are as follows:

[0019] The present application prepares a high-strength wood floor, which is assembled from bottom to top in the order of a balance layer, a floor glue, a substrate, a floor glue, a decorative layer, a floor glue and a wear-resistant layer. The substrate is a composite material made of wood powder, modified wood powder, polyethylene and modified calcium carbonate whisker. The calcium carbonate whisker is a completely crystalline without lattice defects, so the mechanical strength is extremely high. Part of the modified wood powder can coat the modified calcium carbonate by click reaction to form a material with calcium carbonate whisker as the core. The calcium carbonate whisker as the core is not easy to be mechanically damaged. Another part of the modified wood powder grafts polyethylene through free radical reaction, and the polyethylene chains mutually reinforce each other. At the same time, the modified wood powder introduces benzene rings, which have certain rigidity and can improve the mechanical properties of the substrate. The wear-resistant layer is prepared by curing reaction of modified filler and phenolic epoxy resin. The modified filler is surface treated with KH550, and the polyamine structure on the surface makes the modified filler become a curing agent and crosslinking agent of the phenolic epoxy resin. The three-dimensional network crosslinking structure and the alumina in the modified filler can both increase the wear resistance of the wear-resistant layer. The use of mesoporous silica to load alumina can make the alumina difficult to precipitate in the wear-resistant layer, thereby increasing the service life of the wear-resistant coating. The main component of mesoporous silica is silica, which has excellent high-temperature resistance, corrosion resistance and high stability. Therefore, the wear-resistant layer prepared has good wear resistance.

[0020] The base material is prepared by using wood powder, polyethylene, calcium carbonate whisker, styrene ethyl trimethoxysilane and KH580 as raw materials. The wood powder is surface modified by using styrene ethyl trimethoxysilane, so that the wood powder is grafted with styrene groups. The calcium carbonate whisker is surface modified by using KH580, so that the surface of the calcium carbonate whisker is grafted with mercapto groups. The wood powder, modified wood powder, polyethylene and modified calcium carbonate whisker are extruded by using a double screw extruder. Under the action of benzoyl peroxide, the double bonds of the partially modified wood powder are grafted with polyethylene. Under the action of ultraviolet light, the double bonds of the remaining modified wood powder and the mercapto groups of the modified calcium carbonate whisker are subjected to free radical reaction, so that the base material is prepared.

[0021] The wear-resistant layer is prepared by using KH792 as raw material. The amino groups on the surface of KH792 have weak alkalinity, so that the hydrolysis of tetraethyl orthosilicate is promoted to form silica oligomers. During the hydrolysis of tetraethyl orthosilicate, the content of ethanol in the solution is increased, so that the solubility of stearic acid is improved to form micelles. At the same time, the surface of the formed silica oligomers has hydroxyl groups, which can be hydrolyzed and condensed with the silicon hydroxyl groups of KH792 to form a silica oligomer with amino groups. Because the amino groups can react with H + ions in the solution to form NH3 + , the surface of the micelles formed by stearic acid is negatively charged, and NH3 + and stearic acid are subjected to electrostatic interaction, so that the silica oligomer with amino groups is deposited on the surface of the stearic acid micelles and is condensed by the surface silicon hydroxyl groups to form a functional silicon-based mesoporous material. By calcination, the short carbon chain with amino groups of the silicon-based mesoporous material is lost to form a precursor with a pure SiO2 skeleton structure. Then, the precursor is treated with a solution containing aluminum ions to deposit aluminum ions in the pores of the precursor. Finally, by calcination, the aluminum ions in the pores are oxidized to aluminum oxide, and the aluminum oxide and the pores are combined together through the oxygen atoms on the skeleton to complete the structural modification of the pores to prepare the filler. The filler is treated again with KH550 to form ether bonds by dehydration between KH550 and the hydroxyl groups on the surface of the filler to prepare the modified filler. The amino groups of the modified filler react with the epoxy groups of the phenolic epoxy resin to prepare the wear-resistant layer. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Embodiment 1

[0024] A preparation method of a high-strength wooden floor is as follows:

[0025] Step S1: dispersing wood powder in ethanol, adding styrene ethyl trimethoxysilane and deionized water, and reacting for 1 h at a rotation speed of 120 rpm and a temperature of 50℃ to obtain modified wood powder; dispersing calcium carbonate whiskers in ethanol, adding KH580 and deionized water, and reacting for 2 h at a rotation speed of 120 rpm and a temperature of 50℃ to obtain modified calcium carbonate whiskers.

[0026] Step S2: adding wood powder, modified wood powder, polyethylene, modified calcium carbonate whiskers and benzoyl peroxide into a twin-screw extruder, and extruding at a rotation speed of 150 rpm and a temperature of 200℃ to obtain a pretreated substrate; and photocuring the pretreated substrate under irradiation of 395 nm ultraviolet light for 5 min to obtain a substrate.

[0027] Step S3: uniformly mixing stearic acid, deionized water, KH792 and tetraethyl orthosilicate, stirring for 2 h at a rotation speed of 150 rpm and a temperature of 25℃, removing the filtrate, and calcining the filter cake at a temperature of 540℃ for 2 h to obtain a precursor.

[0028] Step S4: uniformly mixing the precursor, an aluminum nitrate solution and deionized water, stirring for 2 h at a rotation speed of 150 rpm and a temperature of 25℃, removing the filtrate, and calcining the filter cake at a temperature of 450℃ for 3 h to obtain a filler.

[0029] Step S5: dispersing the filler in tetrahydrofuran, adding deionized water and KH550, stirring for 1 h at a rotation speed of 100 rpm and a temperature of 30℃, removing the filtrate, and obtaining modified filler; dispersing the modified filler into a phenolic epoxy resin, stirring for 10 min at a rotation speed of 100 rpm and a temperature of 20℃, and standing for curing reaction for 3 h to obtain a wear-resistant layer.

[0030] Step S6: assembling the composite floor in the order of a balance layer, a floor glue, a substrate, a floor glue, a decorative layer, a floor glue and a wear-resistant layer from bottom to top, hot-pressing at a temperature rising speed of 3℃ / min, a pressure rising rate of 60 kPa / min, a hot-pressing temperature of 80℃, a hot-pressing pressure of 60 kPa, and a holding time of 70 min to obtain a high-strength wooden floor.

[0031] The amount of wood powder, ethanol, styrene ethyl trimethoxysilane and deionized water in step S1 is 1 g: 20 mL: 10 mL: 30 mL, the amount of calcium carbonate whiskers, ethanol, KH580 and deionized water is 1 g: 20 mL: 10 mL: 30 mL, the amount of wood powder is 500 g, and the amount of calcium carbonate whiskers is 100 g.

[0032] The weight ratio of the wood powder, modified wood powder, polyethylene, modified calcium carbonate whisker and benzoyl peroxide in step S2 is 40:20:40:10:3, the wood powder is 50 mesh wood powder, the polyethylene is polyethylene 80000, and the amount of wood powder is 1000g.

[0033] The amount ratio of stearic acid, deionized water, KH792 and tetraethyl orthosilicate in step S3 is 1g:40mL:1mL:10mL, and the amount of stearic acid is 5g.

[0034] The amount ratio of the precursor, aluminum nitrate solution and deionized water in step S4 is 4g:20mL:30mL, the mass fraction of the aluminum nitrate solution is 15%, and the amount of the precursor is 20g.

[0035] The amount ratio of the filler, tetrahydrofuran, deionized water and KH570 in step S5 is 1g:20mL:10mL:30mL, the amount ratio of the modified filler and the phenolic epoxy resin is 1g:10mL, the phenolic epoxy resin is bisphenol A type phenolic epoxy resin, the resin epoxy equivalent weight is 180-190g / eq, the viscosity is 9000-11000mPa·S(25℃), the amount of the filler is 20g, and the amount of the modified filler is 22g.

[0036] The balance layer in step S6 is melamine resin impregnated paper, the floor glue is PVC floor glue, and the decorative layer is melamine resin decorative paper, the thickness of the balance layer is 2mm, the thickness of the substrate is 4mm, the thickness of the decorative layer is 1mm, and the thickness of the wear-resistant layer is 0.4mm.

[0037] Example 2

[0038] A preparation method of a high-strength wood floor, the specific steps are as follows:

[0039] Step S1: disperse the wood powder in ethanol, add styrene ethyl trimethoxysilane and deionized water, and react under the condition of a rotation speed of 150rpm and a temperature of 60℃ for 2h to prepare modified wood powder, and disperse the calcium carbonate whisker in ethanol, add KH580 and deionized water, and react under the condition of a rotation speed of 150rpm and a temperature of 60℃ for 3h to prepare modified calcium carbonate whisker.

[0040] Step S2: add the wood powder, modified wood powder, polyethylene, modified calcium carbonate whisker and benzoyl peroxide into a double screw extruder, extrude under the condition of a rotation speed of 180rpm and a temperature of 220℃ to prepare pretreated substrate, and irradiate the pretreated substrate under 395nm ultraviolet light for 10min to prepare substrate.

[0041] Step S3: uniformly mix stearic acid, deionized water, KH792 and tetraethyl orthosilicate, stir for 3h under the condition of 180rpm and 30℃, remove the filtrate, and calcine the filter cake at 560℃ for 3h to obtain a precursor.

[0042] Step S4: uniformly mix the precursor, aluminum nitrate solution and deionized water, stir for 3h under the condition of 180rpm and 30℃, remove the filtrate, and calcine the filter cake at 480℃ for 5h to obtain a filler.

[0043] Step S5: disperse the filler in tetrahydrofuran, add deionized water and KH550, stir for 2h under the condition of 120rpm and 40℃, remove the filtrate, and obtain a modified filler. Disperse the modified filler into a phenolic epoxy resin, stir for 15min under the condition of 120rpm and 25℃, and stand for 5h to obtain a wear-resistant layer.

[0044] Step S6: assemble the composite floor in the order of balance layer, floor glue, base material, floor glue, decorative layer, floor glue and wear-resistant layer from bottom to top, and hot-press under the condition of temperature increasing rate of 5℃ / min, pressure increasing rate of 70kPa / min, hot-press temperature of 90℃, hot-press pressure of 70kPa, and holding time of 80min to obtain a high-strength wooden floor.

[0045] The amount ratio of wood powder, ethanol, styrene ethyl trimethoxysilane and deionized water in step S1 is 1g:20mL:10mL:30mL, the amount ratio of calcium carbonate whisker, ethanol, KH580 and deionized water is 1g:20mL:10mL:30mL, the amount of wood powder is 500g, and the amount of calcium carbonate whisker is 100g.

[0046] The weight ratio of wood powder, modified wood powder, polyethylene, modified calcium carbonate whisker and benzoyl peroxide in step S2 is 40:20:40:10:3, the wood powder is 50 mesh wood powder, the polyethylene is polyethylene 80000, and the amount of wood powder is 1000g.

[0047] The amount ratio of stearic acid, deionized water, KH792 and tetraethyl orthosilicate in step S3 is 1g:40mL:1mL:10mL, and the amount of stearic acid is 5g.

[0048] The amount ratio of precursor, aluminum nitrate solution and deionized water in step S4 is 4g:20mL:30mL, the mass fraction of aluminum nitrate solution is 15%, and the amount of precursor is 20g.

[0049] The amount ratio of the filler, tetrahydrofuran, deionized water and KH570 in step S5 is 1g:20mL:10mL:30mL, and the amount ratio of the modified filler and the phenolic aldehyde epoxy resin is 1g:10mL, the phenolic aldehyde epoxy resin is bisphenol A type phenolic aldehyde epoxy resin, the resin epoxy equivalent weight is 180-190g / eq, the viscosity is 9000-11000mPa·S(25℃), the amount of the filler is 20g, and the amount of the modified filler is 22g.

[0050] The balance layer in step S6 is melamine resin impregnated paper, the floor glue is PVC floor glue, and the decoration layer is melamine resin decorative paper, the thickness of the balance layer is 3mm, the thickness of the substrate is 6mm, the thickness of the decoration layer is 2mm, and the thickness of the wear-resistant layer is 0.6mm.

[0051] Example 3

[0052] A preparation method of a high-strength wooden floor, and the specific steps are as follows:

[0053] Step S1: disperse the wood powder in ethanol, add styrene ethyl trimethoxysilane and deionized water, and react under the condition of a rotation speed of 135rpm and a temperature of 55℃ for 1.5h to prepare modified wood powder, disperse the calcium carbonate whisker in ethanol, add KH580 and deionized water, and react under the condition of a rotation speed of 135rpm and a temperature of 55℃ for 2.5h to prepare modified calcium carbonate whisker.

[0054] Step S2: add the wood powder, modified wood powder, polyethylene, modified calcium carbonate whisker and benzoyl peroxide into a double screw extruder, extrude under the condition of a rotation speed of 165rpm and a temperature of 210℃ to prepare a pretreated substrate, and irradiate the pretreated substrate under 395nm ultraviolet light for 8min to prepare a substrate.

[0055] Step S3: mix the stearic acid, deionized water, KH792 and tetraethyl orthosilicate uniformly, stir under the condition of a rotation speed of 165rpm and a temperature of 28℃ for 2.5h, remove the filtrate, calcine the filter cake under the condition of a temperature of 550℃ for 2.5h to prepare a precursor.

[0056] Step S4: mix the precursor, aluminum nitrate solution and deionized water uniformly, stir under the condition of a rotation speed of 165rpm and a temperature of 28℃ for 2.5h, remove the filtrate, and calcine the filter cake under the condition of a temperature of 465℃ for 4h to prepare a filler.

[0057] Step S5: The filler was dispersed in tetrahydrofuran, deionized water and KH550 was added, stirred at a speed of 110 rpm and a temperature of 35℃ for 1.5h, the filtrate was removed, and the modified filler was prepared. The modified filler was dispersed into the phenolic epoxy resin, stirred at a speed of 110 rpm and a temperature of 22℃ for 12min, and cured for 4h to prepare the wear-resistant layer.

[0058] Step S6: The composite floor was assembled in the order of balance layer, floor glue, base material, floor glue, decorative layer, floor glue and wear-resistant layer from bottom to top, and hot-pressed under the conditions of temperature rising speed of 4℃ / min, pressure rising rate of 65kPa / min, hot-pressing temperature of 85℃, hot-pressing pressure of 65kPa, and holding time of 75min to prepare the high-strength wooden floor.

[0059] The amount of wood powder, ethanol, styrene ethyl trimethoxysilane and deionized water in step S1 was 1g:20mL:10mL:30mL, the amount of calcium carbonate whisker, ethanol, KH580 and deionized water was 1g:20mL:10mL:30mL, the amount of wood powder was 500g, and the amount of calcium carbonate whisker was 100g.

[0060] The weight ratio of wood powder, modified wood powder, polyethylene, modified calcium carbonate whisker and benzoyl peroxide in step S2 was 40:20:40:10:3, the wood powder was 50 mesh wood powder, the polyethylene was polyethylene 80000, and the amount of wood powder was 1000g.

[0061] The amount of stearic acid, deionized water, KH792 and tetraethyl orthosilicate in step S3 was 1g:40mL:1mL:10mL, and the amount of stearic acid was 5g.

[0062] The amount of precursor, aluminum nitrate solution and deionized water in step S4 was 4g:20mL:30mL, the mass fraction of aluminum nitrate solution was 15%, and the amount of precursor was 20g.

[0063] The amount of filler, tetrahydrofuran, deionized water and KH570 in step S5 was 1g:20mL:10mL:30mL, and the amount of modified filler and phenolic epoxy resin was 1g:10mL. The phenolic epoxy resin was bisphenol A type phenolic epoxy resin with an epoxy equivalent weight of 180-190g / eq and a viscosity of 9000-11000mPa·S(25℃). The amount of filler was 20g, and the amount of modified filler was 22g.

[0064] The balance layer is a melamine resin impregnated paper, the floor glue is a PVC floor glue, and the decorative layer is a melamine resin decorative paper. The thickness of the balance layer is 2.5 mm, the thickness of the substrate is 5 mm, the thickness of the decorative layer is 1.5 mm, and the thickness of the wear-resistant layer is 0.5 mm.

[0065] Comparative Example 1

[0066] The comparative example does not use modified wood powder compared to Example 1, and the remaining steps are the same.

[0067] Comparative Example 2

[0068] The comparative example does not use modified nano calcium carbonate whiskers compared to Example 1, and the remaining steps are the same.

[0069] Comparative Example 3

[0070] The comparative example uses aluminum oxide instead of modified fillers compared to Example 1, and uses diethylene triamine as a curing agent. The specific steps are as follows:

[0071] The aluminum oxide is dispersed into the phenolic epoxy resin, diethylene triamine is added, and stirring is carried out at a speed of 100 rpm and a temperature of 20°C for 10 min. The wear-resistant layer is prepared by standing and curing for 3-5 h.

[0072] The amount ratio of the aluminum oxide, phenolic epoxy resin, and diethylene triamine is 1 g:10 ml:0.5 ml.

[0073] Comparative Example 4

[0074] The comparative example uses fillers instead of modified fillers compared to Example 1, and uses diethylene triamine as a curing agent. The specific steps are as follows:

[0075] The fillers are dispersed into the phenolic epoxy resin, diethylene triamine is added, and stirring is carried out at a speed of 100 rpm and a temperature of 20°C for 10 min. The wear-resistant layer is prepared by standing and curing for 3 h.

[0076] The amount ratio of the fillers, phenolic epoxy resin, and diethylene triamine is 1 g:10 ml:0.5 ml.

[0077] The wear-resistant layers prepared in Examples 1-3 and Comparative Examples 3-4 are tested for the number of revolutions when obvious scratches appear using a Taber-type abrasion tester with 180-grit sandpaper, according to the standard GB / T 17657-2022, and the static bending strength of the high-strength wooden floor prepared in Examples 1-3 and Comparative Examples 1-4 is tested using a universal mechanical testing machine according to the standard GB / T 17657-2022 using the four-point bending method.

[0078] Impact strength / MPa RPM at which a distinct scratch occurs / r Example 1 45.6 10500 Example 2 46.4 11000 Example 3 47.5 11500 Comparative Example 1 42.3 10500 Comparative Example 2 40.7 10500 Comparative Example 3 44.8 8500 Comparative Example 4 45.1 9500

[0079] According to the above table, the high-strength wood floor prepared in Examples 1-3 has better mechanical properties than Comparative Examples 1-4. The high-strength wood floor prepared in Examples 1-3 has a thickness of Example 3>Example 2>Example 1, and thus the impact strength and wear resistance are also Example 3>Example 2>Example 1. Comparative Example 1 does not use modified wood powder, and there is no chemical grafting between the wood powder and polyethylene, so the impact strength is reduced. The wear-resistant layer of Comparative Example 1 is the same as that of Example 1, and thus the wear resistance is the same as that of Example 1. Comparative Example 2 does not use calcium carbonate whiskers, and lacks the reinforcing effect of calcium carbonate whiskers, resulting in a reduction in impact strength. The wear-resistant layer of Comparative Example 2 is the same as that of Example 1, and thus the wear resistance is the same as that of Example 1. Comparative Example 3 uses alumina instead of modified filler. The alumina not loaded by mesoporous material is prone to agglomeration, and cannot form chemical bonds in the wear-resistant layer, which may be precipitated in the wear test. Agglomerated alumina slightly reduces the mechanical properties of the wear-resistant layer, and greatly reduces the wear resistance. Comparative Example 4 uses filler instead of modified filler. The modified filler cannot form stable chemical bonds in the wear-resistant layer, and is precipitated in the wear test. Therefore, the impact strength of Comparative Example 4 is lower than that of the examples, and the wear resistance is slightly lower than that of the examples. In summary, the high-strength wood floor prepared in the present application has superior strength.

[0080] The above is merely an example and description of the present application, and those skilled in the art can make various modifications, supplements or substitutions of the described specific embodiments or use similar ways to replace, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. A method for preparing a high-strength wooden floor, characterized by: The specific steps include: Step S1: dispersing wood flour in ethanol, adding styreneethyltrimethoxysilane and deionized water, and reacting to obtain modified wood flour; dispersing calcium carbonate whiskers in ethanol, adding KH580 and deionized water, and reacting to obtain modified calcium carbonate whiskers; Step S2: adding wood flour, modified wood flour, polyethylene, modified calcium carbonate whiskers and benzoyl peroxide into a twin-screw extruder, extruding to obtain a pretreated substrate, and subjecting the pretreated substrate to photocuring to obtain a substrate; Step S3: uniformly mixing stearic acid, deionized water, KH792 and ethyl orthosilicate, stirring to remove the filtrate, and calcining the filter cake to obtain a precursor; Step S4: uniformly mixing the precursor, aluminum nitrate solution, and deionized water, stirring to remove the filtrate, and calcining the filter cake to obtain the filler; Step S5: dispersing a filler in tetrahydrofuran, adding deionized water and KH550, stirring and removing the filtrate to obtain a modified filler, dispersing the modified filler in a phenolic epoxy resin, stirring and standing, and performing a curing reaction to obtain a wear-resistant layer; the amount ratio of the filler, tetrahydrofuran, deionized water, and KH570 in step S5 is 1g:20mL:10mL:30mL, and the amount ratio of the modified filler to the phenolic epoxy resin is 1g:10mL, and the phenolic epoxy resin is a bis-A phenolic epoxy resin having an epoxy equivalent value of 180-190g / eq and a viscosity of 9000-11000mPa•s at 25°C; Step S6: assembling the composite floor from bottom to top in the order of balancing layer, floor glue, base material, floor glue, decorative layer, floor glue and wear-resistant layer, and performing hot pressing to obtain a high-strength wooden floor through heat preservation and pressing.

2. The method for preparing a high-strength wooden floor according to claim 1, characterized in that: In step S1, the amount ratio of wood powder, ethanol, styreneethyltrimethoxysilane and deionized water is 1 g:20 mL:10 mL:30 mL, and the amount ratio of calcium carbonate whiskers, ethanol, KH580 and deionized water is 1 g:20 mL:10 mL:30 mL.

3. The method for preparing a high-strength wooden floor according to claim 1, characterized in that: In step S2, the weight ratio of the wood flour, modified wood flour, polyethylene, modified calcium carbonate whiskers and benzoyl peroxide is 40:20:40:10:3, and the wood flour is 50 mesh wood flour.

4. The method for preparing a high-strength wooden floor according to claim 1, characterized in that: The amount ratio of stearic acid, deionized water, KH792 and ethyl orthosilicate in step S3 is 1 g:40 mL:1 mL:10 mL.

5. The method for preparing a high-strength wooden floor according to claim 1, characterized in that: The amount ratio of the precursor, aluminum nitrate solution and deionized water in step S4 is 4g:20mL:30mL.

6. The method for preparing a high-strength wooden floor according to claim 1, characterized in that: In step S6, the balancing layer is melamine resin impregnated paper, the floor glue is PVC floor glue, the decorative layer is melamine resin decorative paper, the balancing layer thickness is 2-3 mm, the base material thickness is 4-6 mm, the decorative layer thickness is 1-2 mm, and the wear-resistant layer thickness is 0.4-0.6 mm.

7. A high-strength wooden floor, characterized by: Prepared according to any one of the preparation methods described in claims 1-6.