Nano waterproof agent and application thereof in wood floor

Abstract

The invention provides a nano waterproof agent and application thereof in a wood floor. The invention further provides a microsphere composition. The microsphere composition is prepared from the following components in parts by weight: 1 to 5 parts of polyacrylate nano microspheres, 1 to 5 parts of silane modified lignin-containing nano cellulose, 0 to 15 parts of ethylene-vinyl acetate wax, 5 to 20 parts of long-chain silane, 1 to 5 parts of alkyl glycoside and 50 to 92 parts of alcohol solvent. The nano waterproof agent comprises a component A and a component B, the component A comprises the microsphere composition or is prepared from raw materials comprising the microsphere composition, and the component B comprises a polyacrylate polymer. The nano waterproof agent disclosed by the invention has excellent waterproof and anti-seepage performance on the wood floor, and the waterproof layer has relatively strong adhesive force.

Description

Technical Field

[0001] This invention belongs to the field of decorative materials technology, specifically relating to a nano waterproofing agent and its application in wood flooring. Background Technology

[0002] Wood flooring refers to flooring made of wood or wood-based composite materials. It is aesthetically pleasing, lightweight, and a commonly used building and decoration material. Among them, impregnated paper laminate flooring (market name: engineered wood flooring) is widely used due to its high cost-effectiveness, rich patterns, and ease of maintenance, and global demand for engineered wood flooring remains high. The surface layer of engineered wood flooring is made of melamine resin impregnated decorative paper containing wear-resistant materials, providing excellent water resistance. However, the core layer is medium- or high-density fiberboard made of wood fibers and adhesives, which generally has poor water resistance, a large expansion coefficient, and is prone to warping and deformation when exposed to water. In daily use, excessive moisture from humid weather, accidental spills, or cleaning with a wet mop can cause water to seep into the locking system along the floorboard joints, causing the wood fibers to swell. This can lead to slight warping or deformation at the edges of the flooring, affecting its appearance, reducing its lifespan, and compromising the consumer experience.

[0003] Currently, there are two main ways to waterproof engineered wood flooring. One is to increase the waterproof performance of the substrate, such as adding waterproof paraffin wax during substrate preparation or using adhesives with better water resistance. However, after the locking mechanism is opened, wood fibers still leak out at the seams, causing them to absorb water and swell, leading to warping and deformation. The second method is to waterproof the seams, forming a waterproof layer at the locking point. Paraffin wax is currently the most commonly used material due to its cost-effectiveness. However, paraffin wax has poor permeability, only forming a coating on the surface of the wood fibers and unable to penetrate into the fibers themselves. This results in a low bond between the waterproof layer and the substrate, significantly reducing its waterproof performance. Furthermore, paraffin wax does not have a very low surface energy and still retains some moisture. When there is a lot of moisture on the surface of the wood flooring, water can still seep through the seams to the bottom, causing water accumulation and leading to warping and mold growth. Summary of the Invention

[0004] Based on the above analysis, this invention provides a nano-waterproofing agent and its application in wood flooring, to at least solve the problems of poor waterproofing performance, poor impermeability, and poor adhesion between the waterproof and impermeable coating and the substrate in existing wood flooring technologies. When the nano-waterproofing agent of this invention is applied to wood flooring, after the surface of the assembled floorboards is soaked in water (1 cm deep) for 24 hours in the T-shaped assembly area, there is no leakage at the assembly point, and the edges show no obvious swelling or warping, demonstrating excellent waterproofing and impermeability. Furthermore, this invention also provides a microsphere composition, which, when compounded with a hydrophobic acrylate polymer, can yield a nano-waterproofing agent with excellent waterproofing and impermeability.

[0005] In a first aspect, the present invention provides a microsphere composition comprising the following components in parts by weight: Polyacrylate nanospheres, 1-5 parts 1-5 parts of silane-modified lignin-containing nanocellulose Ethylene-vinyl acetate wax, 0-15 parts. 5 to 20 parts of long-chain silanes Alkyl glycosides, 1 to 5 parts 50 to 92 parts of alcohol solvent.

[0006] In the microsphere composition of the present invention, with the assistance of the surfactant alkyl glycoside, silane-modified nanocellulose and ethylene-vinyl acetate wax interact with polyacrylate nanospheres through π-π bond interactions and intermolecular hydrogen bonding, accumulating on the surface of the polyacrylate nanospheres and encapsulating them to form hybrid particles. Simultaneously, long-chain silanes undergo hydrolysis in alcohol solvents, also forming long-chain silane structures on the silane-modified nanocellulose, ethylene-vinyl acetate wax, polyacrylate nanospheres, and the hybrid particles formed therefrom, endowing the hybrid particles with extremely low surface energy. This microsphere composition can be compounded with waterproofing components such as polyacrylate polymers as a waterproofing agent. The low surface energy particles formed can construct a finer microstructure on the surface of the waterproofing agent coating, increasing the roughness of the waterproofing agent coating surface and enhancing the adhesion and hydrophobicity of the waterproofing agent coating.

[0007] According to some embodiments of the present invention, the polyacrylate nanospheres are selected from one or more of polymethyl acrylate nanospheres, polymethyl methacrylate nanospheres, polyethyl acrylate nanospheres, polyethyl methacrylate nanospheres, polypropyl acrylate nanospheres, polypropyl methacrylate nanospheres, polybutyl acrylate nanospheres, and polybutyl methacrylate nanospheres.

[0008] According to some embodiments of the present invention, the polyacrylate nanospheres are polymethyl methacrylate nanospheres.

[0009] According to some embodiments of the present invention, the average particle size of the polyacrylate nanospheres is 100 nm to 500 nm, preferably 200 nm to 300 nm.

[0010] According to some embodiments of the present invention, the total weight parts of the components in the microsphere composition are 100.

[0011] According to some embodiments of the present invention, the polyacrylate nanospheres in the microsphere composition are 1, 2, 3, 4, 5 parts by weight or any value therebetween.

[0012] In this invention, the "silane-modified lignin-containing nanocellulose" refers to silane-modified nanocellulose containing a certain amount of lignin. The lignin-containing nanocellulose can be obtained commercially or by chemically treating natural wood using conventional methods to remove some lignin and hemicellulose, followed by mechanical grinding.

[0013] Since nanocellulose is hydrophilic and lignin is hydrophobic, using nanocellulose containing some lignin can further improve the hydrophobic properties of the microsphere composition compared to using nanocellulose alone.

[0014] According to some embodiments of the present invention, based on the total weight of lignin and cellulose, the lignin content in the silane-modified lignin-containing nanocellulose is 1% to 15%, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0015] According to some embodiments of the present invention, based on the total weight of lignin and cellulose, the content of nanocellulose in the silane-modified lignin-containing nanocellulose is 85% to 99%, for example 85%, 88%, 90%, 92%, 95%, 99%, etc.

[0016] According to some embodiments of the present invention, the average particle size of the silane-modified lignin-containing nanocellulose is 50 nm to 200 nm.

[0017] According to some embodiments of the present invention, the silane-modified lignin-containing nanocellulose includes lignin-containing nanocellulose modified with a water-soluble silane coupling agent. In this invention, the water-soluble silane coupling agent includes, but is not limited to, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, etc. In this invention, using a water-soluble silane coupling agent to modify nanocellulose allows for silane modification while the nanocellulose remains dispersed, ensuring the uniformity of the nanocellulose modification. Silane-modified nanocellulose can change from hydrophilic to hydrophobic, making it suitable for use in waterproofing agents and improving waterproofing performance.

[0018] According to some embodiments of the present invention, the silane-modified lignin-containing nanocellulose is prepared by a method comprising the following steps: dispersing lignin-containing nanocellulose in water to obtain a dispersion; mixing the dispersion with a water-soluble silane coupling agent and reacting the dispersion to obtain the silane-modified lignin-containing nanocellulose. In some embodiments, the amount of the water-soluble silane coupling agent is 1-10% of the dry weight of the lignin-containing nanocellulose, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc. In some embodiments, the reaction is carried out at a pH of 4.0-5.0. In some embodiments, the reaction temperature is 40-60°C. In some embodiments, the reaction temperature is 45-55°C. In some embodiments, the reaction time is 20-60 minutes, preferably 25-40 minutes.

[0019] According to some embodiments of the present invention, the silane-modified nanocellulose in the microsphere composition is 1, 2, 3, 4, 5 parts by weight or any value therebetween.

[0020] According to some embodiments of the present invention, the ethylene-vinyl acetate wax in the microsphere composition is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 parts by weight or any value between them.

[0021] In the microsphere composition of the present invention, ethylene-vinyl acetate wax may be selectively added or omitted. The addition of ethylene-vinyl acetate wax can appropriately reduce the amount of other hydrophobic components, such as polyacrylate nanospheres and silane-modified lignin-containing nanocellulose, thereby reducing costs. In some embodiments, the ethylene-vinyl acetate wax in the microsphere composition is 2 to 15 parts by weight. In some embodiments, the ethylene-vinyl acetate wax in the microsphere composition is 2 to 10 parts by weight.

[0022] In this invention, no special requirements are made regarding the ratio and molecular weight of ethylene units and vinyl acetate units in the ethylene-vinyl acetate wax.

[0023] According to some embodiments of the present invention, the microsphere composition comprises the following components in parts by weight: 1 to 5 parts of polyacrylate nanospheres, 1 to 5 parts of silane-modified lignin-containing nanocellulose, 5 to 20 parts of long-chain silane, 1 to 5 parts of alkyl glycoside, and 65 to 92 parts of alcohol solvent.

[0024] According to some embodiments of the present invention, the microsphere composition comprises the following components in parts by weight: 1 to 5 parts of polyacrylate nanospheres, 1 to 5 parts of silane-modified lignin-containing nanocellulose, 1 to 15 parts of ethylene-vinyl acetate wax, 5 to 20 parts of long-chain silane, 1 to 5 parts of alkyl glycoside, and 50 to 91 parts of alcohol solvent.

[0025] According to some embodiments of the present invention, the long-chain silane in the microsphere composition is 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 parts by weight or any value therebetween.

[0026] In this invention, "long-chain silane" refers to a silane containing a long-chain hydrocarbon group. Examples of long-chain hydrocarbon groups include, but are not limited to, alkyl, alkenyl, or alkynyl groups having 8 or more (e.g., 8 to 24, preferably 10 to 24, more preferably 16 to 24) carbon atoms. The long-chain hydrocarbon group may optionally be replaced by one or more substituents selected from halogen, hydroxyl, amino, carboxyl, nitro, cyano, alkyl, alkoxy, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl.

[0027] According to some embodiments of the present invention, the alkyl glycoside in the microsphere composition is 1, 2, 3, 4, 5 parts by weight or any value between them.

[0028] According to some embodiments of the present invention, the alcohol solvent in the microsphere composition is 50, 55, 60, 65, 70, 75, 80, 85, 90, 91, 92 parts by weight or any value between them.

[0029] According to some embodiments of the present invention, the alkyl glycosides include C8-C18 alkyl glucosides. In this invention, "C8-C18 alkyl glucoside" refers to an alkyl glycoside synthesized from glucose and C8-C18 fatty alcohols, abbreviated as APG. According to some embodiments of the present invention, the alkyl glycosides include at least one selected from APG0810, APG0814, APG0816, APG1214, APG1216, APG1218, APG10, APG12, and APG14. In this invention, "APG0810" refers to an alkyl glucoside with carbon chains distributed from C8 to C10; "APG0814" refers to an alkyl glucoside with carbon chains distributed from C8 to C14; and "APG10" refers to an alkyl glucoside with a C10 carbon chain. According to some embodiments of the present invention, the alkyl glycosides include tetradecyl glucoside.

[0030] According to some embodiments of the present invention, the alcohol solvent includes C1 to C4 lower alcohols, such as one or more of methanol, ethanol, and isopropanol. In some embodiments, the alcohol solvent includes ethanol.

[0031] According to some embodiments of the present invention, the long-chain silane comprises one or more of silanes containing C10-C24 straight-chain or branched alkyl groups and silanes containing C10-C24 straight-chain or branched alkenyl groups. According to some embodiments of the present invention, the long-chain silane comprises one or more of silanes containing C16-C24 straight-chain alkyl groups and silanes containing C16-C24 straight-chain alkenyl groups. According to some embodiments of the present invention, the long-chain silane comprises one or more of silanes containing C18-C24 straight-chain alkyl groups and silanes containing C18-C24 straight-chain alkenyl groups. According to some embodiments of the present invention, the long-chain silane comprises one or more of silanes containing C20-C24 straight-chain alkyl groups and silanes containing C20-C24 straight-chain alkenyl groups. In the present invention, the long-chain silane may contain one or more C10-C24 straight-chain alkyl groups or branched alkyl groups.

[0032] According to some embodiments of the present invention, the long-chain silane comprises the general formula (R 1 ) n Si(OR 2 ) 4-n Silanes, wherein n is 1, 2 or 3, R 1 Selected from C10-C24 straight-chain or branched alkyl groups, and C10-C24 straight-chain or branched alkenyl groups, R 2Selected from hydrogen atoms, C1-C10 straight-chain or branched alkyl groups, C1-C10 straight-chain or branched haloalkyl groups, C1-C10 straight-chain or branched heteroalkyl groups, C3-C12 cycloalkyl groups, C3-C12 heterocycloalkyl groups, C6-C15 aryl groups, and C3-C15 heteroaryl groups. When n is 2 or 3, each R... 1 Same or different. When n is 1, each R 2 Same or different. In some implementations, R 1 Selected from C16-C24 straight-chain alkyl and C16-C24 straight-chain alkenyl groups. In some embodiments, R 1 Selected from C18-C24 straight-chain alkyl and C18-C24 straight-chain alkenyl groups. In some embodiments, R 1 Selected from C18-C24 straight-chain alkenyl groups. In some embodiments, R 2 Selected from hydrogen atoms, C1-C10 straight-chain or branched alkyl groups, and C1-C10 straight-chain or branched haloalkyl groups. In some embodiments, R 2 Selected from hydrogen atoms, C1-C6 straight-chain or branched alkyl groups, and C1-C6 straight-chain or branched haloalkyl groups. In some embodiments, R 2 It is selected from hydrogen atoms, C1-C4 straight-chain or branched alkyl groups, and C1-C4 straight-chain or branched haloalkyl groups.

[0033] According to some embodiments of the present invention, the long-chain silane includes docosyltriethoxysilane.

[0034] In a second aspect, the present invention provides a nano-waterproofing agent comprising component A and component B, wherein component A comprises the microsphere composition described in the first aspect of the present invention, or is prepared from raw materials comprising the microsphere composition described in the first aspect of the present invention, and component B comprises a polyacrylate polymer.

[0035] According to some embodiments of the present invention, the mass ratio of component A to component B is 1:(1 to 6), for example, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6 or any value between them.

[0036] According to some embodiments of the present invention, component A is prepared by a method comprising the following steps: mixing and reacting the silane-modified nanocellulose, polymethyl methacrylate nanospheres, optionally ethylene-vinyl acetate wax, alkyl glycoside, long-chain silane, and an alcohol solvent; heating the product after reaction to remove the solvent, thereby obtaining component A. In some embodiments, the reaction temperature is 35-70°C, for example, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, etc. In some embodiments, the reaction time is 1-3 hours. In some embodiments, the heating temperature is 66-90°C, for example, 66°C, 70°C, 75°C, 80°C, 85°C, 90°C, etc.

[0037] According to some embodiments of the present invention, in component B, the polyacrylate polymer includes polymers formed by homopolymerization or copolymerization of acrylate monomers under the action of an organosilicon coupling agent.

[0038] In some embodiments, the acrylate monomer comprises one or more of C1-C24 fatty alcohol acrylates and C1-C24 fatty alcohol methacrylates. In some embodiments, the acrylate monomer comprises one or more of C1-C20 fatty alcohol acrylates and C1-C20 fatty alcohol methacrylates. In some embodiments, the acrylate monomer comprises a combination of at least one of C1-C8 fatty alcohol acrylates and C1-C8 fatty alcohol methacrylates with at least one of C10-C20 fatty alcohol acrylates and C10-C20 fatty alcohol methacrylates. In some embodiments, the acrylate monomer comprises one or more of methyl methacrylate, methyl acrylate, isobornyl methacrylate, ethyl methacrylate, n-butyl methacrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, sec-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, n-octyl methacrylate, isooctyl acrylate, lauryl acrylate, tetradecyl acrylate, hexadecyl acrylate, and octadecyl acrylate. In some embodiments, the acrylic monomers include lauryl acrylate, methyl acrylate, and isooctyl acrylate.

[0039] In some embodiments, the organosilicon coupling agent comprises one or more of the following: methacrylates containing C1-C10 alkoxysilyl groups, acrylates containing C1-C10 alkoxysilyl groups, methacrylates containing C1-C10 alkylsilyl groups, and acrylates containing C1-C10 alkylsilyl groups. In some embodiments, the organosilicon coupling agent comprises methacrylates containing C1-C10 alkoxysilyl groups, methacrylates containing C1-C10 alkylsilyl groups, and acrylates containing C1-C10 alkylsilyl groups. In some embodiments, the organosilicon coupling agent comprises methacrylates containing C1-C6 alkoxysilyl groups, methacrylates containing C1-C6 alkylsilyl groups, and acrylates containing C1-C6 alkylsilyl groups. In some embodiments, the organosilicon coupling agent comprises propyl 3-(triethoxysilyl)methacrylate, ethyl 2-(trimethylsilyloxy)methacrylate, and triisopropylsilyl acrylate.

[0040] In this invention, organosilicon coupling agents such as 3-(triethoxysilyl)methacrylate, 2-(trimethylsiloxy)ethyl methacrylate, and triisopropylsilyl acrylate can react with the organic groups of acrylate monomers such as lauryl acrylate, methyl acrylate, and isooctyl acrylate to obtain acrylic polymers with excellent hydrophobic properties. These polymers can form polymer brushes on the surface of waterproof coatings, giving the coating surface extremely low surface energy. Furthermore, under external wear, new polymer brushes can form to achieve a certain self-healing function.

[0041] In some embodiments, the mass ratio of the acrylate monomer to the organosilicon coupling agent is (11 ~ 40):(3 ~ 15), preferably (15 ~ 35):(3 ~ 15).

[0042] In some embodiments, the homopolymerization or copolymerization reaction is carried out in the presence of an initiator. In some embodiments, the initiator includes, but is not limited to, one or more of organic peroxides, persulfates, and azo initiators, preferably including acyl peroxides, such as benzoyl peroxide. In some embodiments, the mass ratio of the initiator to the acrylate monomer is (1-5):(11-40), preferably (1-5):(15-35).

[0043] In some embodiments, the homopolymerization or copolymerization reaction is carried out in an organic solvent. In some embodiments, the organic solvent includes, but is not limited to, oxygen-containing heterocyclic organic solvents, such as tetrahydrofuran. In some embodiments, the mass ratio of the organic solvent to the acrylate monomer is (35-84):(11-40), preferably (35-84):(15-35).

[0044] In some embodiments, the homopolymerization or copolymerization reaction is further carried out in the presence of a thickener. In some embodiments, the thickener includes, but is not limited to, silicate thickeners, such as trimethylsilyloxysilicate. Organosilicon thickeners can not only adjust the viscosity of the waterproofing agent, but also improve the adhesion and water resistance of the coating. In some embodiments, the mass ratio of the thickener to the acrylate monomer is (1~5):(11~40), preferably (1~5):(15~35).

[0045] According to some embodiments of the present invention, in component B, the polyacrylate polymer is prepared from raw materials comprising the following parts by weight: Acrylic ester monomers, 11 to 40 parts, such as 11, 15, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40 parts, etc.; 3 to 15 parts of organosilicon coupling agent, for example, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 parts, etc.; Thickener 1 to 5 parts, for example 1, 2, 3, 4, 5 parts, etc.; Initiator 1 to 5 parts, for example 1, 2, 3, 4, 5 parts, etc.; Organic solvent 35 to 84 parts, for example 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 84 parts, etc.

[0046] According to some embodiments of the present invention, in component B, the polyacrylate polymer is prepared by a method comprising the following steps: mixing and reacting 11-40 parts by weight of acrylate monomer, 3-15 parts by weight of organosilicon coupling agent, 1-5 parts by weight of thickener, 1-5 parts by weight of initiator, and 35-84 parts by weight of organic solvent; heating the product after reaction to remove the organic solvent, thereby obtaining the polyacrylate polymer. According to some embodiments of the present invention, the reaction temperature is 35-70°C, for example, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, etc. According to some embodiments of the present invention, the reaction time is 1-3 hours. According to some embodiments of the present invention, the heating temperature is 66-80°C, for example, 66°C, 70°C, 75°C, 80°C, etc.

[0047] According to some embodiments of the present invention, the polyacrylate polymer is prepared by a method comprising the following steps: mixing and reacting 1-10 parts by weight of lauryl acrylate, 5-15 parts by weight of methyl acrylate, 5-15 parts by weight of isooctyl acrylate, 1-5 parts by weight of propyl 3-(triethoxysilyl)methacrylate, 1-5 parts by weight of ethyl 2-(trimethylsiloxy)methacrylate, 1-5 parts by weight of triisopropylsilyl acrylate, 1-5 parts by weight of trimethylsiloxysilicate, 1-5 parts by weight of benzoyl peroxide, and 35-84 parts by weight of tetrahydrofuran; heating the product after reaction to remove the tetrahydrofuran, thereby obtaining the polyacrylate polymer. According to some embodiments of the present invention, the reaction temperature is 35-70°C, for example, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, etc. According to some embodiments of the present invention, the reaction time is 1-3 hours. According to some embodiments of the present invention, the heating temperature is 66 to 80°C, for example, 66°C, 70°C, 75°C, 80°C, etc.

[0048] In some embodiments, in the preparation method of the polyacrylate polymer, lauryl acrylate can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 parts by weight or any value between them; methyl acrylate can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 parts by weight or any value between them; isooctyl acrylate can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 parts by weight or any value between them; 3-(triethoxysilyl)methacrylate can be 1, 2, 3, 4, 5 parts by weight or any value between them; 2-(trimethylsiloxy)ethyl methacrylate can be 1, 2, 3, 4, 5 parts by weight or any value between them; triisopropylsilyl acrylate can be 1, 2, 3, 4, 5 parts by weight or any value between them; trimethylsiloxysilicate 1 ~ 5 parts; benzoyl peroxide may be 1, 2, 3, 4, 5 parts by weight or any value between them; tetrahydrofuran may be 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 84 parts by weight or any value between them.

[0049] According to some embodiments of the present invention, the total weight parts of the raw materials for preparing the polyacrylate polymer are 100.

[0050] Thirdly, the present invention provides a self-curing nano-waterproofing agent solution, which includes the nano-waterproofing agent described in the second aspect of the present invention and a polar solvent.

[0051] When immersed in a polar solvent system, the nano-waterproofing agent can easily penetrate into the interior of the wood fiber, causing the hydroxyl groups of the wood fiber to cross-link and couple with the siloxy groups and carboxylic acid groups, forming chemical bonds and enhancing the bonding force.

[0052] In this invention, the polar solvent includes, but is not limited to, organic solvents containing at least one functional group of hydroxyl, ether, or ester groups, or combinations thereof.

[0053] According to some embodiments of the present invention, the polar solvent includes polar organic solvents containing both hydroxyl and ether bonds, polar organic solvents containing at least two ester groups, or combinations thereof.

[0054] According to some embodiments of the present invention, the self-curing nano waterproofing agent solution comprises: 10 to 20 parts by weight of waterproofing agent and 80 to 90 parts by weight of polar solvent.

[0055] According to some embodiments of the present invention, the polar solvent includes propylene glycol methyl ether and / or dimethyl nylonate. In some embodiments, the polar solvent includes propylene glycol methyl ether and dimethyl nylonate.

[0056] According to some embodiments of the present invention, the self-curing nano waterproofing agent solution comprises: 10 to 20 parts by weight of nano waterproofing agent, 35 to 40 parts by weight of propylene glycol methyl ether, and 45 to 50 parts by weight of dimethyl nylonate.

[0057] In the self-curing nano-waterproofing agent solution of the present invention, the nano-waterproofing agent can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 parts by weight or any value therebetween; propylene glycol methyl ether can be 35, 36, 37, 38, 39, 40 parts by weight or any value therebetween; dimethyl nylonate can be 45, 46, 47, 48, 49, 50 parts by weight or any value therebetween.

[0058] Fourthly, the present invention provides a waterproof and leak-proof wood flooring, wherein the surface of the locking part is coated with the self-curing nano waterproofing agent solution described in the third aspect of the present invention.

[0059] The waterproof and leak-proof wood flooring of the present invention can achieve the following effect: after the assembled flooring is soaked in water (1cm deep) for 24 hours on the surface of the T-shaped assembly area, there is no leakage at the wood flooring assembly point, and the edges do not show obvious swelling or warping.

[0060] Fifthly, the present invention provides the application of the nano-waterproofing agent described in the second aspect or the self-curing nano-waterproofing agent solution described in the third aspect in wood flooring.

[0061] In this invention, the wood flooring includes, but is not limited to, engineered wood flooring.

[0062] According to some embodiments of the present invention, the application includes: applying the self-curing nano waterproofing agent solution to the surface of the wood flooring interlocking area, followed by heating and curing treatment.

[0063] According to some embodiments of the present invention, the heating temperature is 50 to 70°C. According to some embodiments of the present invention, the heating time is 1 to 5 minutes.

[0064] Compared with the prior art, the present invention has the following beneficial effects: (1) The microsphere composition provided by this invention has interactions between its components, which can be compounded with the waterproof component polyacrylate polymer to improve its waterproof performance. With the assistance of alkyl glycoside surfactants, silane-modified nanocellulose microparticles and ethylene-vinyl acetate wax droplets will aggregate and encapsulate the polyacrylate nanospheres on their surface through π-π bond interactions and intermolecular hydrogen bonding, forming hybrid microparticles. At the same time, long-chain silanes undergo hydrolysis in the alcohol system, which will also form long-chain silane structures on the modified nanocellulose microparticles, ethylene-vinyl acetate wax, polyacrylate nanospheres, and the hybrid microparticles, giving the microparticles extremely low surface energy. These low surface energy microparticles can construct a finer microstructure on the coating surface, improve the roughness of the coating surface, and enhance the adhesion and hydrophobicity of the coating.

[0065] (2) The nano waterproofing agent provided by the present invention combines microsphere components with low surface energy with polyacrylate polymers with excellent hydrophobic properties. While enhancing the adhesion and hydrophobicity of the coating, it can form a polymer brush on the surface of the waterproof coating, so that the surface of the coating has extremely low surface energy. At the same time, it can form a new polymer brush under external wear to achieve a certain self-repair function.

[0066] (3) The nano waterproofing agent provided by the present invention can easily penetrate into the interior of wood fibers under the immersion of polar solvent system, so that the hydroxyl groups of wood fibers can form cross-linking and coupling with siloxy groups and carboxylic acid groups, forming chemical bonds, enhancing the bonding force, and improving the waterproof and anti-permeability effect of wood flooring. Attached Figure Description

[0067] Figure 1 This is a scanning electron microscope image of the waterproof coating of the waterproof and leak-proof wood flooring in Example 1. Detailed Implementation

[0068] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0069] Unless otherwise defined, the technical terms used in the following embodiments and comparative examples have the same meanings as commonly understood by those skilled in the art. Unless otherwise specified, the reagents used in the following embodiments and comparative examples are all conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments and comparative examples can all be obtained commercially or by existing methods; unless otherwise specified, the reagent dosages are those used in conventional experimental operations; unless otherwise specified, the experimental methods are all conventional methods.

[0070] In the following embodiments and comparative examples of this invention, the tests on the water resistance of wood flooring were all conducted with reference to the NALFA (North American Laminate Flooring Association) test method for the water resistance of laminate flooring surfaces, "NALFA Laminate Surface Swell Test - Assembled Joint". The specific test methods are as follows: Three pieces of engineered wood flooring were cut and spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the cylindrical tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the cylindrical tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level in the cylindrical tube was checked to see if there was a significant drop. Then, the water in the cylindrical tube was drained, and the residual water stains on the floor surface were wiped off. The splicing joints were observed to see if there was any expansion or warping, and if there was any obvious water seepage at the bottom of the floor. A qualitative rating was given, as shown in Table 1.

[0071] Table 1

[0072] The polymethyl methacrylate nanospheres used in the following examples and comparative examples of this invention were purchased from Comai New Materials Co., Ltd., with an average particle size of 100-500 nm.

[0073] The ethylene-vinyl acetate wax used in the following examples and comparative examples of this invention was purchased from Qiaoyin New Materials Co., Ltd., and the model is Luwax EVA1.

[0074] Example 1 Preparation of modified cellulose nanoparticles: Natural wood is chemically treated to remove some lignin and hemicellulose, and then mechanically ground to obtain nanocellulose containing 2-5 wt% lignin. The nanocellulose containing 2-5 wt% lignin is dispersed in water to form a 0.5% mass fraction dispersion. Then, γ-aminopropyltriethoxysilane (2% of the dry weight of the nanocellulose containing 2-5 wt% lignin) is added, the pH is adjusted to 4-5 with acetic acid, and the mixture is stirred at 50°C for 30 min to obtain silane-modified nanocellulose.

[0075] Preparation of waterproof and leak-proof wood flooring: 1) Weigh 1 part by weight of modified cellulose nanoparticles (particle size 50 ~ 150 nm), 1 part by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 2 parts by weight of ethylene-vinyl acetate wax, 1 part by weight of tetradecyl glucoside, 10 parts by weight of docetenyltriethoxysilane, and 85 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.5 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:6 ratio to form a nano waterproofing agent; 4) Mix 20 parts by weight of nano waterproofing agent, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0076] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The spliced ​​joints were observed for any swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring of Example 1 exhibited no swelling, warping, or water seepage, and its qualitative rating was Level 1.

[0077] The microstructure of the waterproof coating on the waterproof and leak-proof wood flooring in Example 1 is as follows: Figure 1 As shown, the waterproof coating evenly covers the wood fibers, and the surface coating has good adhesion to the wood fiber surface.

[0078] Example 2 The preparation method of the modified nanocellulose microparticles used in this embodiment is the same as that in Example 1, except that "nanocellulose containing 2 to 5 wt% lignin" is replaced with "nanocellulose containing 4 to 7 wt% lignin", and the amount of γ-aminopropyltriethoxysilane used is 4% of the dry weight of nanocellulose containing 4 to 7 wt% lignin.

[0079] Preparation of waterproof and leak-proof wood flooring: 1) Weigh 2 parts by weight of modified cellulose nanoparticles (particle size 50 ~ 150 nm), 2 parts by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 4 parts by weight of ethylene-vinyl acetate wax, 1 part by weight of tetradecyl glucoside, 12 parts by weight of docetenyltriethoxysilane, and 79 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.8 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 6 parts by weight of lauryl acrylate, 2 parts by weight of propyl 3-(triethoxysilyl)methacrylate, 2 parts by weight of trimethylsiloxysilicate, 2 parts by weight of 2-(trimethylsiloxy)ethyl methacrylate, 2 parts by weight of triisopropylsilyl acrylate, 8 parts by weight of methyl acrylate, 7 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 70 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:4 ratio to form a nano waterproofing agent; 4) Mix 16 parts by weight of nano waterproofing agent, 37 parts by weight of propylene glycol methyl ether, and 47 parts by weight of dimethyl nylonate at room temperature and stir for 2 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0080] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The spliced ​​joints were observed for any swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring of Example 2 exhibited no swelling, warping, or water seepage, and its qualitative rating was Level 1.

[0081] Example 3 The modified cellulose nanoparticles used in this embodiment are prepared using the same method as those in Example 1, except that "cellulose nanoparticles containing 2-5 wt% lignin" are replaced with "cellulose nanoparticles containing 7-10 wt% lignin", "γ-aminopropyltriethoxysilane" is replaced with "γ-glycidoxypropyltrimethoxysilane", and the amount of γ-glycidoxypropyltrimethoxysilane used is 6% of the dry weight of the cellulose nanoparticles containing 7-10 wt% lignin.

[0082] Preparation of waterproof and leak-proof wood flooring: 1) Weigh 3 parts by weight of modified cellulose nanoparticles (particle size 50 ~ 150 nm), 3 parts by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 5 parts by weight of ethylene-vinyl acetate wax, 2 parts by weight of tetradecyl glucoside, 15 parts by weight of docetenyltriethoxysilane, and 72 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 60°C for 1.8 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 8 parts by weight of lauryl acrylate, 3 parts by weight of 3-(triethoxysilyl)methacrylate, 3 parts by weight of trimethylsiloxysilicate, 3 parts by weight of 2-(trimethylsiloxy)ethyl methacrylate, 3 parts by weight of triisopropylsilyl acrylate, 10 parts by weight of methyl acrylate, 9 parts by weight of isooctyl acrylate, 2 parts by weight of benzoyl peroxide, and 59 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 60°C for 2.5 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:3 ratio to form a nano waterproofing agent; 4) Mix 14 parts by weight of nano waterproofing agent, 38 parts by weight of propylene glycol methyl ether, and 48 parts by weight of dimethyl nylonate at room temperature and stir for 2 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 5 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0083] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The spliced ​​joints were observed for any swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring of Example 3 exhibited no swelling, warping, or water seepage, and its qualitative rating was Level 1.

[0084] Example 4 The modified cellulose nanoparticles used in this embodiment are prepared using the same method as those in Example 1, except that "cellulose nanoparticles containing 2-5 wt% lignin" are replaced with "cellulose nanoparticles containing 9-12 wt% lignin", and "γ-aminopropyltriethoxysilane" is replaced with "γ-glycidoxypropyltrimethoxysilane". The amount of γ-glycidoxypropyltrimethoxysilane used is 8% of the dry weight of the cellulose nanoparticles containing 9-12 wt% lignin.

[0085] Preparation of waterproof and leak-proof wood flooring: 1) Weigh 4 parts by weight of modified cellulose nanoparticles (particle size 50-150 nm), 3 parts by weight of polymethyl methacrylate nanospheres (particle size 200-300 nm), 8 parts by weight of ethylene-vinyl acetate wax, 3 parts by weight of tetradecyl glucoside, 18 parts by weight of docetenyltriethoxysilane, and 64 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 60°C for 1.8 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 9 parts by weight of lauryl acrylate, 4 parts by weight of 3-(triethoxysilyl)methacrylate, 3 parts by weight of trimethylsiloxysilicate, 4 parts by weight of 2-(trimethylsiloxy)ethyl methacrylate, 4 parts by weight of triisopropylsilyl acrylate, 12 parts by weight of methyl acrylate, 12 parts by weight of isooctyl acrylate, 3 parts by weight of benzoyl peroxide, and 49 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 60°C for 3 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:1 ratio to form a nano waterproofing agent; 4) Mix 10 parts by weight of nano waterproofing agent, 40 parts by weight of propylene glycol methyl ether, and 50 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 5 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0086] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The spliced ​​joints were observed for any swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring in Example 4 exhibited no swelling, warping, or water seepage, and its qualitative rating was Level 1.

[0087] Example 5 The modified cellulose nanoparticles used in this embodiment are prepared using the same method as those in Example 1.

[0088] Preparation of waterproof and leak-proof wood flooring: 1) Weigh 3 parts by weight of modified cellulose nanoparticles (particle size 50 ~ 150 nm), 1 part by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 1 part by weight of tetradecyl glucoside, 10 parts by weight of docetenyltriethoxysilane, and 85 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.5 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:6 ratio to form a nano waterproofing agent; 4) Mix 20 parts by weight of nano waterproofing agent, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0089] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The spliced ​​joints were observed for any swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring in Example 5 exhibited no swelling, warping, or water seepage, and its qualitative rating was Level 1.

[0090] The weight parts of each raw material used in preparing component A and component B in the above embodiments are listed in Table 2.

[0091] Table 2

[0092] Comparative Example 1 1) Heat paraffin wax to its melting point to obtain a paraffin waterproofing agent.

[0093] 2) Apply the paraffin waterproofing agent directly to the surface of the wood flooring's locking mechanism using a roller. After natural curing, you will obtain a waterproof and leak-proof wood flooring treated with the paraffin waterproofing agent. Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The splicing points were observed for swelling or warping, and there was significant water seepage at the bottom of the floor. Testing revealed that, compared to the waterproof and leak-proof wood flooring of Example 1, the wood flooring of Comparative Example 1 had multiple swelling points, edge warping, and significant water seepage at the bottom, resulting in a qualitative rating of Level 3.

[0094] It is evident that, compared to conventional paraffin waterproofing agents, the waterproof and leak-proof wood flooring treated with the nano waterproofing agents of Examples 1 to 5 of this application significantly improves its waterproof and leak-proof performance.

[0095] Comparative Example 2 The only difference from Example 1 is that the waterproofing agent does not contain component A. Specifically: 1) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 2) Mix 20 parts by weight of component B, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylonate at room temperature and stir for 1.5 hours to obtain a self-curing waterproofing agent solution. 3) Apply the self-curing waterproofing agent solution obtained in step 2) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0096] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The splicing points were observed for swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring in Comparative Example 2 had 5 points of pinpoint swelling and 4 points of minor warping, resulting in a qualitative rating of Level 2.

[0097] Comparative Example 3 The only difference from Example 1 is that, in step 1) when preparing component A, modified nanocellulose particles are not added, and the amount of ethylene-vinyl acetate wax is adjusted to 3 parts by weight; specifically: 1) Weigh 1 part by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 3 parts by weight of ethylene-vinyl acetate wax, 1 part by weight of tetradecyl glucoside, 10 parts by weight of docetenyltriethoxysilane, and 85 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.5 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:6 ratio to form a nano waterproofing agent; 4) Mix 20 parts by weight of nano waterproofing agent, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0098] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The splicing joints were observed for swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring in Comparative Example 3 had two instances of point-like swelling and two instances of very minor warping, resulting in a qualitative rating of Level 2.

[0099] Comparative Example 4 The only difference from Example 1 is that, in step 1) when preparing component A, "modified nanocellulose microparticles" are replaced with "equal parts by weight of unmodified nanocellulose microparticles containing 2wt% to 5wt% lignin". Specifically: 1) Weigh 1 part by weight of cellulose nanoparticles (particle size 50 ~ 150 nm), 1 part by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 2 parts by weight of ethylene-vinyl acetate wax, 1 part by weight of tetradecyl glucoside, 10 parts by weight of docetenyltriethoxysilane, and 85 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.5 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:6 ratio to form a nano waterproofing agent; 4) Mix 20 parts by weight of nano waterproofing agent, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0100] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The splicing points were observed for swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing showed that the waterproof and leak-proof wood flooring in Comparative Example 4 had 3 points of pinpoint swelling and 2 points of minor warping, resulting in a qualitative rating of Level 2.

[0101] Comparative Example 5 The only difference from Example 1 is that, in step 1) when preparing component A, "docosapentyltriethoxysilane" is replaced with "an equal part by weight of vinyltriethoxysilane", specifically: 1) Weigh 1 part by weight of modified cellulose nanoparticles (particle size 50 ~ 150 nm), 1 part by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 2 parts by weight of ethylene-vinyl acetate wax, 1 part by weight of tetradecyl glucoside, 10 parts by weight of vinyltriethoxysilane, and 85 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.5 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:6 ratio to form a nano waterproofing agent; 4) Mix 20 parts by weight of nano waterproofing agent, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0102] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The splicing points were observed for swelling or warping, and there was no obvious water seepage at the bottom of the floor. The test results showed that the waterproof and leak-proof wood flooring in Comparative Example 5 had one point of swelling and one very minor warping, resulting in a qualitative rating of Level 2.

[0103] Comparative Example 6 The only difference from Example 1 is that, in step 1) when preparing component A, modified nanocellulose microparticles, polymethyl methacrylate nanospheres, ethylene-vinyl acetate wax, and tetradecyl glucoside are not added, and the amount of docetenyltriethoxysilane is adjusted to 15 parts by weight. Specifically: 1) Weigh 15 parts by weight of docetenyltriethoxysilane and 85 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.5 hours. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:6 ratio to form a nano waterproofing agent; 4) Mix 20 parts by weight of nano waterproofing agent, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0104] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The splicing points were observed for swelling or warping, and there was no obvious water seepage at the bottom of the floor. Testing revealed that the waterproof and leak-proof wood flooring in Comparative Example 6 had 4 points of pinpoint swelling and 4 points of minimal warping, resulting in a qualitative rating of Level 2.

[0105] Comparative Example 7 The only difference from Example 1 is that, in step 1) when preparing component A, the modified nanocellulose microparticles are replaced with modified lignin-free nanocellulose microparticles, and the modification method of nanocellulose is the same as in Example 1.

[0106] The modified cellulose nanoparticles used in this comparative example were prepared by the following method: Nanocellulose is obtained by chemically treating natural wood to remove lignin and hemicellulose, followed by mechanical grinding. The nanocellulose is dispersed in water to form a 0.5% mass fraction dispersion, and then γ-aminopropyltriethoxysilane (2% of the dry weight of nanocellulose) is added. The pH is adjusted to 4-5 with acetic acid, and the mixture is stirred at 50°C for 30 minutes to obtain silane-modified nanocellulose microparticles.

[0107] Preparation of waterproof and leak-proof wood flooring: 1) Weigh 1 part by weight of modified cellulose nanoparticles (particle size 50 ~ 150 nm), 1 part by weight of polymethyl methacrylate nanospheres (particle size 200 ~ 300 nm), 2 parts by weight of ethylene-vinyl acetate wax, 1 part by weight of tetradecyl glucoside, 10 parts by weight of docetenyltriethoxysilane, and 85 parts by weight of ethanol. Mix them and place them in a glass reactor. Stir at 65°C for 1.5 h. Then, heat to 75°C to remove the ethanol, obtaining component A. 2) Weigh 5 parts by weight of lauryl acrylate, 1 part by weight of 3-(triethoxysilyl)methacrylate, 1 part by weight of trimethylsiloxysilicate, 1 part by weight of 2-(trimethylsiloxy)ethyl methacrylate, 1 part by weight of triisopropylsilyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isooctyl acrylate, 1 part by weight of benzoyl peroxide, and 80 parts by weight of tetrahydrofuran. Mix them and place them in a glass reactor. Stir at 65°C for 2 hours. Then, heat to 75°C to remove the tetrahydrofuran, obtaining component B. 3) Mix component A and component B in a 1:6 ratio to form a nano waterproofing agent; 4) Mix 20 parts by weight of nano waterproofing agent, 35 parts by weight of propylene glycol methyl ether, and 45 parts by weight of dimethyl nylon at room temperature and stir for 1.5 hours to obtain a self-curing nano waterproofing agent solution. 5) Apply the self-curing nano waterproofing agent solution obtained in step 4) directly to the surface of the wood flooring's locking mechanism, bake at 60°C for 3 minutes, and then allow it to cure naturally to obtain wood flooring with waterproof and leak-proof functions.

[0108] Waterproof performance test of wood flooring: Three pieces of engineered wood flooring were spliced ​​together to form a T-shaped gap structure. A cylindrical tube with an inner diameter of 12cm and a height of 5cm was placed over the T-shaped splicing area, and a waterproof seal was applied around the outside of the tube. Room temperature water was injected into the tube to a depth of 1cm, and the surface of the tube was sealed with plastic film to prevent moisture evaporation. After standing for 24 hours, the water level inside the tube was checked for a significant drop. Then, the water inside the tube was drained, and the floor surface was wiped dry. The splicing points were observed for swelling or warping, and there was no obvious water seepage at the bottom of the floor. The test results showed that the waterproof and leak-proof wood flooring in Comparative Example 7 had one point of swelling and one very minor warping, resulting in a qualitative rating of Level 2.

[0109] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A microsphere composition comprising the following components in parts by weight: Polyacrylate nanospheres, 1-5 parts 1-5 parts of silane-modified lignin-containing nanocellulose Ethylene-vinyl acetate wax, 0-15 parts. 5 to 20 parts of long-chain silanes Alkyl glycosides, 1 to 5 parts 50 to 92 parts of alcohol solvent.

2. The microsphere composition according to claim 1, characterized in that, The polyacrylate nanospheres are selected from one or more of polymethyl acrylate nanospheres, polymethyl methacrylate nanospheres, polyethyl acrylate nanospheres, polyethyl methacrylate nanospheres, polypropyl acrylate nanospheres, polypropyl methacrylate nanospheres, polybutyl acrylate nanospheres, and polybutyl methacrylate nanospheres, preferably polymethyl methacrylate nanospheres; and / or Based on the total weight of lignin and cellulose, the silane-modified lignin-containing nanocellulose contains 1% to 15% lignin and / or 85% to 99% cellulose; and / or The silane-modified lignin-containing nanocellulose is selected from lignin-containing nanocellulose modified with a water-soluble silane coupling agent; preferably, the water-soluble silane coupling agent is selected from at least one of γ-aminopropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane; and / or The silane-modified lignin-containing nanocellulose is prepared by a method comprising the following steps: dispersing lignin-containing nanocellulose in water to obtain a dispersion; mixing the dispersion with a water-soluble silane coupling agent and reacting the dispersion to obtain the silane-modified lignin-containing nanocellulose; preferably, the reaction is carried out at a pH of 4.0 to 5.0; preferably, the reaction temperature is 40°C to 60°C; preferably, the amount of the water-soluble silane coupling agent is 1% to 10% of the dry weight of the lignin-containing nanocellulose; and / or The alkyl glycoside comprises C8-C18 alkyl glucoside, preferably at least one of APG0810, APG0814, APG0816, APG1214, APG1216, APG1218, APG10, APG12, and APG14; more preferably, it comprises tetradecyl glucoside; and / or The alcohol solvent includes C1 to C4 lower alcohols, preferably one or more of methanol, ethanol, and isopropanol, and more preferably ethanol.

3. The microsphere composition according to claim 1 or 2, characterized in that, The long-chain silane includes one or more of silanes containing C10 to C24 straight-chain or branched alkyl groups and silanes containing C10 to C24 straight-chain or branched alkenyl groups, preferably including one or more of silanes containing C16 to C24 straight-chain alkyl groups and silanes containing C16 to C24 straight-chain alkenyl groups. Preferably, the long-chain silane comprises the general formula (R 1 ) n Si(OR 2 ) 4-n Silanes, wherein n is 1, 2 or 3, R 1 Selected from C10-C24 straight-chain or branched alkyl groups and C10-C24 straight-chain or branched alkenyl groups, preferably C16-C24 straight-chain alkyl groups and C16-C24 straight-chain alkenyl groups, R 2 The atom is selected from hydrogen atoms, C1-C10 straight-chain or branched alkyl groups, C1-C10 straight-chain or branched haloalkyl groups, C1-C10 straight-chain or branched heteroalkyl groups, C3-C12 cycloalkyl groups, C3-C12 heterocycloalkyl groups, C6-C15 aryl groups, and C3-C15 heteroaryl groups. Hydrogen atoms, C1-C10 straight-chain or branched alkyl groups, and C1-C10 straight-chain or branched haloalkyl groups are preferred. Hydrogen atoms, C1-C6 straight-chain or branched alkyl groups, and C1-C6 straight-chain or branched haloalkyl groups are more preferred. More preferably, the long-chain silane includes docetenyltriethoxysilane.

4. A nano-waterproofing agent comprising component A and component B, wherein component A comprises the microsphere composition according to any one of claims 1-3, or is prepared from raw materials comprising the microsphere composition according to any one of claims 1-3, and component B comprises a polyacrylate polymer; Preferably, component A is prepared by a method comprising the following steps: The silane-modified lignin-containing nanocellulose, polymethyl methacrylate nanospheres, optional ethylene-vinyl acetate wax, alkyl glycosides, long-chain silanes, and alcohol solvents are mixed and reacted. The product after reaction is heated to remove the alcohol solvent, yielding component A. More preferably, the reaction temperature is 35-70°C, and the reaction time is 1-3 hours; More preferably, the heating temperature is 66 to 90°C.

5. The nano-waterproofing agent as described in claim 4, characterized in that, The mass ratio of component A to component B is 1:(1~6); and / or In component B, the polyacrylate polymer includes polymers formed by homopolymerization or copolymerization of acrylate monomers under the action of an organosilicon coupling agent. Preferably, the acrylate monomer includes one or more of C1-C24 fatty alcohol acrylates and C1-C24 fatty alcohol methacrylates; more preferably, it includes one or more of methyl methacrylate, methyl acrylate, isobornyl methacrylate, ethyl methacrylate, n-butyl methacrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, sec-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, n-octyl methacrylate, isooctyl acrylate, lauryl acrylate, tetradecyl acrylate, hexadecyl acrylate, and octadecyl acrylate; and even more preferably, it includes lauryl acrylate, methyl acrylate, and isooctyl acrylate. Preferably, the organosilicon coupling agent comprises one or more of the following: methacrylates containing C1-C10 alkoxysilyl groups, acrylates containing C1-C10 alkoxysilyl groups, methacrylates containing C1-C10 alkylsilyl groups, and acrylates containing C1-C10 alkylsilyl groups; more preferably, it comprises propyl 3-(triethoxysilyl)methacrylate, ethyl 2-(trimethylsilyloxy)methacrylate, and triisopropylsilyl acrylate. Preferably, the mass ratio of the acrylate monomer to the organosilicon coupling agent is (11 ~ 40):(3 ~ 15), more preferably (15 ~ 35):(3 ~ 15).

6. The nano-waterproofing agent as described in claim 5, characterized in that, The homopolymerization or copolymerization reaction is carried out in the presence of an initiator; preferably, the initiator includes one or more of organic peroxides, persulfates, and azo initiators, more preferably including acyl peroxides, and more preferably including benzoyl peroxide; preferably, the mass ratio of the initiator to the acrylate monomer is (1~5):(11~40); and / or The homopolymerization or copolymerization reaction is carried out in the presence of a thickener; preferably, the thickener comprises a silicate thickener, more preferably trimethylsilyloxysilicate; preferably, the mass ratio of the thickener to the acrylate monomer is (1~5):(11~40); and / or The homopolymerization or copolymerization reaction is carried out in an organic solvent; preferably, the organic solvent includes an oxygen-containing heterocyclic organic solvent, more preferably tetrahydrofuran; preferably, the mass ratio of the organic solvent to the acrylate monomer is (35 ~ 84): (11 ~ 40).

7. The nano-waterproofing agent according to any one of claims 4-6, characterized in that, In component B, the polyacrylate polymer is prepared by a method comprising the following steps: mixing 11-40 parts by weight of acrylate monomer, 3-15 parts by weight of organosilicon coupling agent, 1-5 parts by weight of thickener, 1-5 parts by weight of initiator and 35-84 parts by weight of organic solvent and reacting them; heating the product after reaction to remove the organic solvent to obtain the polyacrylate polymer. Preferably, the polyacrylate polymer is prepared by a method comprising the following steps: mixing and reacting 1-10 parts by weight of lauryl acrylate, 5-15 parts by weight of methyl acrylate, 5-15 parts by weight of isooctyl acrylate, 1-5 parts by weight of propyl 3-(triethoxysilyl)methacrylate, 1-5 parts by weight of ethyl 2-(trimethylsiloxy)methacrylate, 1-5 parts by weight of triisopropylsilyl acrylate, 1-5 parts by weight of trimethylsiloxysilicate, 1-5 parts by weight of benzoyl peroxide and 35-84 parts by weight of tetrahydrofuran; heating the product after reaction to remove the tetrahydrofuran, thereby obtaining the polyacrylate polymer; Preferably, the reaction temperature is 35-70°C, and the reaction time is 1-3 hours; Preferably, the heating temperature is 66 to 80°C.

8. A self-curing nano-waterproofing agent solution, comprising the nano-waterproofing agent according to any one of claims 4-7 and a polar solvent; Preferably, the polar solvent includes polar organic solvents containing both hydroxyl and ether bonds, polar organic solvents containing at least two ester groups, or combinations thereof; Preferably, the self-curing nano-waterproofing agent solution comprises: 10-20 parts by weight of nano waterproofing agent, 80-90 parts by weight of polar solvent; Preferably, the polar solvent includes propylene glycol methyl ether and / or dimethyl nylonate; More preferably, the self-curing nano waterproofing agent solution comprises: 10 to 20 parts by weight of nano waterproofing agent, 35 to 40 parts by weight of propylene glycol methyl ether, and 45 to 50 parts by weight of dimethyl nylonate.

9. A waterproof and leak-proof wood flooring, wherein the surface of the locking mechanism is coated with the self-curing nano waterproofing agent solution as described in claim 8.

10. The application of the nano-waterproofing agent according to any one of claims 4-7 or the self-curing nano-waterproofing agent solution according to claim 8 in wood flooring; Preferably, the application includes: The self-curing nano waterproofing agent solution was applied to the surface of the wood flooring locking mechanism and then heated and cured. Preferably, the heating temperature is 50 to 70°C and the heating time is 1 to 5 minutes.

Images