Preparation method of dustproof and moistureproof plastic-wood floor

Abstract

The invention discloses a preparation method of a dustproof and moistureproof plastic-wood floor, and relates to the technical field of plastic-wood floors. The preparation method comprises the following steps: modifying the surfaces of nano-scale silicon dioxide particles, introducing organic amine for functionalization, and carrying out quaternization by using alkyl halide to improve the charge property and hydrophobicity of the surfaces of the nano-scale silicon dioxide particles; secondly, the plant fibers are preliminarily modified by using methyltrimethoxysilane, and then the surface layers of the plant fibers are coated with modified nano silicon dioxide to form a super-hydrophobic particle coating, so that a micro-nano hydrophobic structure is realized, and the adhesion area of dust is reduced. The surface of the plant fiber coated with the nano-modified silicon dioxide is modified by low-temperature plasma treatment, so that the plant fiber forms a three-dimensional network structure in the base material, and the compatibility and the dispersity are improved; and finally, carrying modified nano silicon dioxide and micron-sized carbon powder on the surface of the semi-finished plastic-wood floor by utilizing a polymethyl methacrylate physical coating film to form a coarse structure to cooperate with inner and outer layer double-effect hydrophobicity. The prepared plastic-wood floor has moisture-proof and dust-proof effects.

Description

Technical Field

[0001] The invention relates to the technical field of plastic wood flooring, in particular to a method for preparing a dustproof and moisture-proof plastic wood flooring. Background Art

[0002] Dust-proof and moisture-proof plastic wood flooring is a new type of floor material that combines the advantages of plastic and wood and is widely used in homes, businesses and public places. As people's requirements for indoor environmental quality increase, traditional wooden floors and plastic floors have gradually exposed some shortcomings, such as being susceptible to moisture, easy to deform, and difficult to clean. Therefore, it is particularly important to develop a floor material that has both the natural beauty of wood and the durability and moisture resistance of plastic.

[0003] The dust and moisture resistance of plastic wood flooring is an important performance indicator, which is directly related to the aesthetics, service life, user experience and safety of the floor. Good dust and moisture resistance can effectively extend the service life of the floor, reduce maintenance costs, improve the comfort and health of the living environment, and meet the needs of different application scenarios. Therefore, when preparing plastic wood flooring, special attention should be paid to its dust and moisture resistance. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing a dustproof and moisture-proof plastic wood floor to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing dust-proof and moisture-proof plastic wood flooring, comprising the following preparation steps: (1) Soaking the organic amine functionalized nano-silica in a dimethyl sulfoxide solution of chloromethane at a solid-liquid ratio of 1-3:20, heating to 50-60°C, reacting under stirring at a speed of 60-120 rpm, and finally cooling to room temperature, filtering, washing the solid with dimethyl sulfoxide for 3 times, and then drying at 30°C for 5 hours to obtain the modified nano-silica; (2) uniformly applying the coating on the surface of the initially modified plant fiber so that the coating thickness is 1-3 μm, and drying at 60° C. for 50-100 min to obtain the coated plant fiber; introducing the coated plant fiber into a plasma atmosphere zone for plasma surface modification to obtain a modified plant fiber; (3) Dissolve polymethyl methacrylate in acetone, stir magnetically for 24 hours at a constant temperature of 0°C and a closed condition at a stirring speed of 200 rpm, then add modified nano-silicon dioxide and carbon powder with a particle size of 1-3 μm, stir electrically for 30 minutes at a stirring speed of 200 rpm to obtain a suspension; place the prepared board in the above suspension, pull and immerse it back and forth 100-200 times, and dry it at a constant temperature of 80°C for 2 hours to obtain a dust-proof and moisture-proof plastic wood floor.

[0006] Furthermore, the preparation method of the organic amine functionalized nano-silica in the step (1) is as follows: 5 parts of chloropropyltrimethoxysilane are added to 20-40 parts of cyclohexane to prepare a solution, ultrasonically dispersed for 30 minutes at a power of 50KHz, and then 3-5 parts of nano-silica are added thereto, and the solution is sealed, and then ultrasonically oscillated at a power of 50-70KHz for 1-3 hours; after the solution is completed, the sample is extracted with toluene for 8 hours, and vacuum dried at 100°C for 8 hours with a vacuum degree of -0.085MPa to obtain an intermediate product; then 1-3 parts of tetrahydropyrrole are added to 30 parts of the cyclohexane solution, and after the solution is uniformly dispersed at a power of 40-50KHz, the above 3-4 parts of the intermediate product are immersed therein, and the solution is sealed; then ultrasonically oscillated at a power of 50-70KHz for 0.5-1.5 hours; after the solution is completed, the sample is extracted with toluene for 8 hours, and then vacuum dried at 100°C for 8 hours with a vacuum degree of -0.085MPa to obtain the organic amine functionalized nano-silica.

[0007] Furthermore, in the step (1), the concentration of methyl chloride in the dimethyl sulfoxide solution of methyl chloride is 70 wt %.

[0008] Furthermore, the preparation method of the preliminary modified plant fiber in step (2) is: take 0.3-0.6g of plant fiber into a small beaker, place it together with 100μL methyltrimethoxysilane and 200μL deionized water in a sealed container, and heat it at 95-105°C for 4-6h to complete the preliminary modification of the plant fiber.

[0009] Furthermore, the preparation method of the plant fiber coating liquid in step (2) is as follows: take 0.2-0.8g of modified nano-silica, add it to 20ml of tetrahydrofuran and ultrasonicate for 1h as liquid A, and the ultrasonic power is 35kHz; take 0.35-1.05g of polydimethoxysilane, add it to 20ml of tetrahydrofuran and ultrasonicate for 30min, and the ultrasonic power is 35kHz, then add 0.035g of benzoyl peroxide, a curing agent of polydimethoxysilane, and continue ultrasonicate for 10min to obtain liquid B; mix liquid A and liquid B and stir for 10min, and the stirring speed is 120rpm to obtain the plant fiber coating liquid.

[0010] Furthermore, the plasma modification parameters in step (2) are: the distance between the upper surface of the fiber bundle and the nozzle is 5 MM, the distance between the lower surface of the fiber bundle and the nozzle is less than 20 MM, the power is 40 W, the plasma is helium, and the processing time is 2-24 s.

[0011] Furthermore, the preparation method of the board in step (3) is: hot mixing the modified plant powder with a mixed powder of PVC powder, dimethyldichlorosilane, calcium stearate, and a stabilizer, mixing the raw material components evenly by a high-speed mixer, preparing a mixture at 100-140° C., feeding the mixture into an extruder or an injection molding machine, refining the mixture at 125° C. to produce a sheet, and hot pressing the sheet at 120° C. and 30 MPa.

[0012] Furthermore, the mass ratio of the modified plant powder, PVC powder, dimethyldichlorosilane, calcium stearate and stabilizer is 15-25:100:2-9:1-3:1-10.

[0013] Furthermore, the stabilizer is 2,6-di-tert-butyl-4-methylphenol.

[0014] Furthermore, in step (3), the mass volume ratio of polymethyl methacrylate, acetone, modified nano-silicon dioxide and carbon powder is 0.5-1:1:0.1-0.3:0.1-0.2.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: The invention coats plant fibers with modified nano-silicon dioxide for plasma treatment, adds polyethylene to prepare plastic wood flooring, and then coats a layer of modified nano-silicon dioxide to achieve hydrophobic and dustproof effects.

[0016] First, organic amine functionalization is introduced into the surface modification of nano-scale silica particles, and alkyl halides are used for quaternization to improve the charge and hydrophobicity of the surface. The quaternary ammonium group neutralizes the charge by forming an ionic molecular layer on the surface of the plastic wood floor, thereby achieving the purpose of antistatic. This ionic molecular layer can effectively neutralize the static charge on the surface of the material and prevent static electricity accumulation on the surface of the plastic wood floor. The surface of the silica after alkyl halides quaternization has a long carbon chain, and the long-chain alkane can form a protective layer, because these long-chain molecules can self-assemble into a hydrophobic layer on the surface of the material to prevent water penetration. Secondly, methyltrimethoxysilane is used to preliminarily modify the plant fiber, and polydimethylsiloxane is used as a binder to coat the modified nano-silica on the surface of the plant fiber to form a super-hydrophobic particle coating, which is evenly dispersed in the three-dimensional network structure of the crossed plant fibers, realizing a micro-nano hydrophobic structure. Its microscopic rough surface can reduce the adhesion area of ​​dust. At the same time, nano-silica has a certain self-cleaning ability, making it difficult for dust to adhere and easy to clean; low-temperature plasma treatment is then used to modify the surface of the plant fiber coated with nano-modified silica to expose more active binding sites, so that the plant fibers are combined with each other in the base material to form a three-dimensional network structure, while improving the compatibility and dispersibility of the plant fibers and polyethylene; finally, polymethyl methacrylate physical coating is used to load modified nano-silica and micron-sized carbon powder on the surface of the semi-finished plastic wood floor to form a rough structure that synergizes the inner and outer layers with double-effect hydrophobicity. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the test methods for various indicators of a dust-proof and moisture-proof plastic wood flooring produced in the following examples as follows: Dustproof: The samples of the embodiment and the comparative example were made into a size of 10 cm×10 cm×2 cm, and then their surface resistivity was tested according to the requirements of IEC60093.

[0019] Moisture-proof: The samples of the embodiment and the comparative example were made into a size of 10 cm×10 cm×2 cm, and then 2 μL of water was dropped on the surface of the plastic wood board to test the contact angle of the water drop on the surface of the plastic wood board.

[0020] Example 1; (1) 5 parts of chloropropyltrimethoxysilane were added to 20 parts of cyclohexane to prepare a solution, ultrasonically sonicated for 30 minutes at a power of 50 kHz, and after uniform dispersion, 3 parts of nano-silicon dioxide were added thereto, and the solution was sealed, and then ultrasonically oscillated at a power of 50 kHz for 1 hour; after the solution was finished, the sample was extracted with toluene for 8 hours, and vacuum dried at 100°C for 8 hours with a vacuum degree of -0.085 MPa to obtain an intermediate product; then 1 part of tetrahydropyrrole was added to 30 parts of the cyclohexane solution, and after uniform dispersion at a power of 40 kHz, the above 3 parts of the intermediate product were immersed in it. and sealed; then subjected to ultrasonic oscillation at a power of 50KHz for 0.5h; after the end, the sample was extracted with toluene for 8h, and then vacuum dried at 100℃ for 8h, with a vacuum degree of -0.085MPa, to obtain organic amine functionalized nano-silica; the organic amine functionalized nano-silica was immersed in a dimethyl sulfoxide solution with a concentration of 70wt% chloromethane at a solid-liquid ratio of 1:20, heated to 50℃, reacted under stirring at a speed of 60rpm, and finally cooled to room temperature, filtered, and the solid was washed with dimethyl sulfoxide 3 times, and then dried at 30℃ for 5h to obtain modified nano-silica; (2) Take 0.3g of plant fiber and put it in a small beaker. Place it in a sealed container with 100μL of methyltrimethoxysilane and 200μL of deionized water. Heat it at 95℃ for 4h to complete the preliminary modification of the plant fiber. Take 0.2g of modified nano-silica and add it to 20ml of tetrahydrofuran and ultrasonicate it for 1h as liquid A. The ultrasonic power is 35kHz. Take 0.35g of polydimethoxysilane and add it to 20ml of tetrahydrofuran and ultrasonicate it for 30min. The ultrasonic power is 35kHz. Then add 0.035g Benzoyl peroxide, a curing agent of polydimethoxysilane, is ultrasonically treated for 10 minutes to obtain liquid B; liquid A and liquid B are mixed and stirred for 10 minutes at a stirring speed of 120 rpm to obtain a plant fiber coating liquid; the coating is evenly applied on the surface of the initially modified plant fiber to make the coating thickness of 1 μm, and dried at 60°C for 50 minutes to obtain a coated plant fiber; the coated plant fiber is introduced into a plasma atmosphere zone for plasma surface modification, the upper surface of the fiber bundle is 5MM away from the nozzle, the lower surface of the fiber bundle is less than 20MM away from the nozzle, the power is 40W, the plasma is helium, and the processing time is 2s to obtain a modified plant fiber; (3) The modified plant powder is hot mixed with a mixed powder of PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer 2,6-di-tert-butyl-4-methylphenol. The mass ratio of the modified plant powder, PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer is 15:100:2:1:1. The raw material components are mixed evenly by a high-speed mixer. The mixture is prepared at 100°C and put into an extruder or injection molding machine. The mixture is smelted at 125°C to produce sheets. The sheets are hot-pressed at 120°C and 30MPa to form sheets. Polymethyl methacrylate is dissolved in propylene glycol. ketone, magnetically stirred for 24 hours at a constant temperature of 0°C and closed conditions, the stirring speed was 200 rpm, and then modified nano-silica and carbon powder with a particle size of 1 μm were added, the mass volume ratio of polymethyl methacrylate, acetone, modified nano-silica and carbon powder was 0.5:1:0.1:0.1, and electric stirring was performed for 30 minutes at a stirring speed of 200 rpm to obtain a suspension; the prepared board was placed in the above suspension, pulled and immersed back and forth 100 times, and dried at a constant temperature of 80°C for 2 hours to obtain a dust-proof and moisture-proof plastic wood floor.

[0021] Example 2; (1) 5 parts of chloropropyltrimethoxysilane were added to 30 parts of cyclohexane to prepare a solution, ultrasonically sonicated for 30 minutes at a power of 50 kHz, and after uniform dispersion, 4 parts of nano-silicon dioxide were added thereto, and the solution was sealed, and then ultrasonically oscillated at a power of 60 kHz for 2 hours; after the end, the sample was extracted with toluene for 8 hours, and vacuum dried at 100°C for 8 hours with a vacuum degree of -0.085 MPa to obtain an intermediate product; then 2 parts of tetrahydropyrrole were added to 30 parts of the cyclohexane solution, and after uniform dispersion at a power of 45 kHz, the above 3.5 parts of the intermediate product were immersed in into it and sealed; then ultrasonic oscillate at a power of 60KHz for 1 hour; after the end, extract the sample with toluene for 8 hours, and then vacuum dry it at 100℃ for 8 hours, with a vacuum degree of -0.085MPa, to obtain organic amine functionalized nano-silica; soak the organic amine functionalized nano-silica in a dimethyl sulfoxide solution with a concentration of 70wt% chloroform at a solid-liquid ratio of 2:20, heat it to 55℃, react under stirring at a speed of 90rpm, and finally cool it to room temperature, filter it, take the solid and wash it with dimethyl sulfoxide for 3 times, and then dry it at 30℃ for 5 hours to obtain modified nano-silica; (2) Take 0.45g of plant fiber and put it in a small beaker. Place it in a sealed container with 100μL of methyltrimethoxysilane and 200μL of deionized water. Heat it at 100℃ for 5h to complete the initial modification of the plant fiber. Take 0.5g of modified nano-silica and add it to 20ml of tetrahydrofuran and ultrasonicate it for 1h as liquid A. The ultrasonic power is 35kHz. Take 0.7g of polydimethoxysilane and add it to 20ml of tetrahydrofuran and ultrasonicate it for 30min. The ultrasonic power is 35kHz. Then add 0.035g Benzoyl peroxide, a curing agent of polydimethoxysilane, is ultrasonically treated for 10 minutes to obtain liquid B; liquid A and liquid B are mixed and stirred for 10 minutes at a stirring speed of 120 rpm to obtain a plant fiber coating liquid; the coating is evenly applied on the surface of the initially modified plant fiber to make the coating thickness 2 μm, and dried at 60° C. for 75 minutes to obtain a coated plant fiber; the coated plant fiber is introduced into a plasma atmosphere zone for plasma surface modification, the upper surface of the fiber bundle is 5 MM away from the nozzle, the lower surface of the fiber bundle is less than 20 MM away from the nozzle, the power is 40 W, the plasma is helium, and the processing time is 13 s to obtain a modified plant fiber; (3) The modified plant powder is hot mixed with a mixed powder of PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer 2,6-di-tert-butyl-4-methylphenol. The mass ratio of the modified plant powder, PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer is 20:100:5.5:2:5.5. The raw material components are mixed evenly by a high-speed mixer, and a mixed material is obtained at 120°C. The mixed material is put into an extruder or an injection molding machine, and the mixed material is smelted at 125°C to produce a sheet. The sheet is hot-pressed at 120°C and 30MPa to form a sheet. Polymethyl methacrylate is dissolved in In acetone, magnetic stirring is carried out at 0°C constant temperature and closed conditions for 24 hours, and the stirring speed is 200 rpm. Then, modified nano-silica and carbon powder with a particle size of 2 μm are added, and the mass volume ratio of polymethyl methacrylate, acetone, modified nano-silica and carbon powder is 0.75:1:0.2:0.15. Electric stirring is carried out for 30 minutes, and the stirring speed is 200 rpm to obtain a suspension. The prepared board is placed in the above suspension, pulled and immersed back and forth 150 times, and dried at a constant temperature of 80°C for 2 hours to obtain a dust-proof and moisture-proof plastic wood floor.

[0022] Example 3; (1) Add 5 parts of chloropropyltrimethoxysilane to 40 parts of cyclohexane to prepare a solution, ultrasonicate for 30 minutes at a power of 50KHz, and after uniform dispersion, add 5 parts of nano-silicon dioxide thereto, seal it, and then ultrasonicate at a power of 70KHz for 3 hours; after completion, extract the sample with toluene for 8 hours, and vacuum dry it at 100°C for 8 hours with a vacuum degree of -0.085MPa to obtain an intermediate product; then add 3 parts of tetrahydropyrrole to 30 parts of cyclohexane solution, and after uniform dispersion at a power of 50KHz, immerse the above 4 parts of the intermediate product therein , and sealed; then ultrasonic oscillate at a power of 70KHz for 1.5 hours; after the end, extract the sample with toluene for 8 hours, and then vacuum dry it at 100℃ for 8 hours, with a vacuum degree of -0.085MPa, to obtain organic amine functionalized nano-silica; soak the organic amine functionalized nano-silica in a dimethyl sulfoxide solution with a concentration of 70wt% chloromethane at a solid-liquid ratio of 3:20, heat it to 60℃, react it under stirring at a speed of 120rpm, and finally cool it to room temperature, filter it, take the solid and wash it with dimethyl sulfoxide 3 times, and then dry it at 30℃ for 5 hours to obtain modified nano-silica; (2) Take 0.6g of plant fiber and put it in a small beaker. Place it in a sealed container with 100μL of methyltrimethoxysilane and 200μL of deionized water. Heat it at 105℃ for 6h to complete the preliminary modification of the plant fiber. Take 0.8g of modified nano-silica and add it to 20ml of tetrahydrofuran and ultrasonicate it for 1h as liquid A. The ultrasonic power is 35kHz. Take 1.05g of polydimethoxysilane and add it to 20ml of tetrahydrofuran and ultrasonicate it for 30min. The ultrasonic power is 35kHz. Then add 0.035g Benzoyl peroxide, a curing agent of polydimethoxysilane, is ultrasonically treated for 10 minutes to obtain liquid B; liquid A and liquid B are mixed and stirred for 10 minutes at a stirring speed of 120 rpm to obtain a plant fiber coating liquid; the coating is evenly applied on the surface of the initially modified plant fiber to make the coating thickness of 3 μm, and dried at 60°C for 100 minutes to obtain a coated plant fiber; the coated plant fiber is introduced into a plasma atmosphere zone for plasma surface modification, the upper surface of the fiber bundle is 5 MM away from the nozzle, the lower surface of the fiber bundle is less than 20 MM away from the nozzle, the power is 40 W, the plasma is helium, and the processing time is 24 s to obtain a modified plant fiber; (3) The modified plant powder is hot mixed with a mixed powder of PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer 2,6-di-tert-butyl-4-methylphenol. The mass ratio of the modified plant powder, PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer is 25:100:9:3:10. The raw material components are mixed evenly by a high-speed mixer, and a mixed material is prepared at 140°C. The mixed material is put into an extruder or an injection molding machine, and the mixed material is smelted at 125°C to produce a sheet. The sheet is hot-pressed at 120°C and 30MPa to form a sheet. Polymethyl methacrylate is dissolved in In acetone, magnetic stirring is carried out at a constant temperature of 0°C and closed conditions for 24 hours, and the stirring speed is 200 rpm. Then, modified nano-silica and carbon powder with a particle size of 3 μm are added, and the mass volume ratio of polymethyl methacrylate, acetone, modified nano-silica and carbon powder is 1:1:0.3:0.2. Electric stirring is carried out for 30 minutes, and the stirring speed is 200 rpm to obtain a suspension. The prepared board is placed in the above suspension, pulled and immersed back and forth 200 times, and dried at a constant temperature of 80°C for 2 hours to obtain a dust-proof and moisture-proof plastic wood floor.

[0023] Comparative Example 1: The difference between Comparative Example 1 and Example 2 is that step (1) is different. Step (1) is changed to: 5 parts of chloropropyltrimethoxysilane are added to 30 parts of cyclohexane to prepare a solution, ultrasonically sonicated for 30 minutes at a power of 50 kHz, and after uniform dispersion, 4 parts of nano-silicon dioxide are added thereto, and the solution is sealed, and then ultrasonically oscillated at a power of 60 kHz for 2 hours; after the end, the sample is extracted with toluene for 8 hours, and vacuum dried at 100°C for 8 hours, with a vacuum degree of -0.085 MPa, to obtain an intermediate product; then 2 parts of tetrahydropyrrole are added to 30 parts of the cyclohexane solution, and after uniform dispersion at a power of 45 kHz, the above 3.5 parts of the intermediate product are immersed therein, and the solution is sealed; then ultrasonically oscillated at a power of 60 kHz for 1 hour; after the end, the sample is extracted with toluene for 8 hours, and then vacuum dried at 100°C for 8 hours, with a vacuum degree of -0.085 MPa, to obtain modified nano-silicon dioxide; the remaining steps are the same as Example 2.

[0024] Comparative Example 2: The difference between Comparative Example 2 and Example 2 is that step (2) is different. Step (2) is changed to: take 0.5g of modified nano-silica, add it to 20ml of tetrahydrofuran and ultrasonicate it for 1h as liquid A, and the ultrasonic power is 35kHz; take 0.7g of polydimethoxysilane and add it to 20ml of tetrahydrofuran and ultrasonicate it for 30min, and the ultrasonic power is 35kHz, and then add 0.035g The curing agent of polydimethoxysilane is benzoyl peroxide, and the ultrasonic treatment is continued for 10 minutes to obtain liquid B; liquid A and liquid B are mixed and stirred for 10 minutes at a stirring speed of 120 rpm to obtain a plant fiber coating liquid; the coating is evenly applied on the surface of the plant fiber to make the coating thickness of 2 μm, and dried at 60° C. for 75 minutes to obtain a coated plant fiber; the coated plant fiber is introduced into a plasma atmosphere zone for plasma surface modification, the upper surface of the fiber bundle is 5 MM away from the nozzle, the lower surface of the fiber bundle is less than 20 MM away from the nozzle, the power is 40 W, the plasma is helium, and the processing time is 13 s to obtain a modified plant fiber; the remaining steps are the same as in Example 2.

[0025] Comparative Example 3: The difference between Comparative Example 3 and Example 2 is that step (2) is different. Step (2) is changed to: 0.45g of plant fiber is placed in a small beaker, and placed in a sealed container together with 100μL of methyltrimethoxysilane and 200μL of deionized water, and heated at 100°C for 5h to complete the preliminary modification of the plant fiber; 0.5g of modified nano-silica is added to 20ml of tetrahydrofuran and ultrasonicated for 1h as liquid A, and the ultrasonic power is 35kHz; 0.7g of polydimethoxysilane is added to 20ml of tetrahydrofuran and ultrasonicated for 30min, and the ultrasonic power is 35kHz, and then 0.035g of The curing agent of polydimethoxysilane is benzoyl peroxide, and the ultrasonic treatment is continued for 10 minutes to obtain liquid B; liquid A and liquid B are mixed and stirred for 10 minutes at a stirring speed of 120 rpm to obtain a plant fiber coating liquid; the coating is evenly applied on the surface of the initially modified plant fiber to make the coating film thickness of 2 μm, and dried at 60° C. for 75 minutes to obtain a modified plant fiber; the remaining steps are the same as in Example 2.

[0026] Comparative Example 4: The difference between Comparative Example 4 and Example 2 is that there is no step (1), and steps (2) and (3) are changed to: (2) 0.7 g of polydimethoxysilane is added to 20 ml of tetrahydrofuran and ultrasonicated for 30 min at an ultrasonic power of 35 kHz, and then 0.035 g of benzoyl peroxide, a curing agent of polydimethoxysilane, is added, and the ultrasonication is continued for 10 min to obtain a plant fiber coating liquid; the coating is evenly applied on the surface of the initially modified plant fiber to make the coating thickness of 2 μm, and dried at 60° C. for 75 min to obtain a coated plant fiber; the coated plant fiber is introduced into a plasma atmosphere zone for plasma surface modification, the upper surface of the fiber bundle is 5 MM away from the nozzle, the lower surface of the fiber bundle is less than 20 MM away from the nozzle, the power is 40 W, the plasma is helium, and the processing time is 13 s to obtain a modified plant fiber; (3) The modified plant powder is hot mixed with a mixed powder of PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer 2,6-di-tert-butyl-4-methylphenol. The mass ratio of the modified plant powder, PVC powder, dimethyldichlorosilane, calcium stearate, and stabilizer is 20:100:5.5:2:5.5. The raw material components are mixed evenly by a high-speed mixer at 120°C to obtain a mixed material, which is put into an extruder or injection molding machine and is smelted at 125°C to produce sheets. The sheets are hot-pressed at 120°C and 30MPa to form sheets. Methyl methacrylate was dissolved in acetone, and magnetically stirred for 24 hours at a constant temperature of 0°C under closed conditions at a stirring speed of 200 rpm. Then, carbon powder with a particle size of 2 μm was added, and the mass volume ratio of polymethyl methacrylate, acetone and carbon powder was 0.75:1:0.15. The mixture was stirred electrically for 30 minutes at a stirring speed of 200 rpm to obtain a suspension. The prepared board was placed in the above suspension, and the board was pulled and immersed for 150 times, and dried at a constant temperature of 80°C for 2 hours to obtain a dust-proof and moisture-proof plastic wood floor. The remaining steps were the same as those in Example 2.

[0027] Effect example Table 1 below shows the performance analysis results of a dust-proof and moisture-proof plastic wood floor using Examples 1 to 3 of the present invention and Comparative Examples 1 to 4.

[0028] Table 1

[0029] From the comparison of the experimental data of dustproofness of the embodiment and the comparative example, it can be found that the present invention introduces organic amine functionalization in the surface modification of nano-scale silicon dioxide particles, and uses alkyl halides for quaternization to improve the charge and hydrophobicity of the surface. The quaternary ammonium group neutralizes the charge by forming an ionic molecular layer on the surface of the plastic wood floor, thereby achieving the purpose of antistatic. This ionic molecular layer can effectively neutralize the static charge on the surface of the material and prevent static electricity accumulation on the surface of the plastic wood floor. From the comparison of the experimental data of hydrophobicity of the embodiment and the comparative example, it can be found that the surface of the silicon dioxide after quaternization of alkyl halides of the present invention has a long carbon chain, and the long-chain alkane can form a protective layer, because these long-chain molecules can self-assemble into a hydrophobic layer on the surface of the material to prevent water penetration. Secondly, methyltrimethoxysilane is used to preliminarily modify the plant fiber, and polydimethylsiloxane is used as a binder to coat the modified nano-silica on the surface of the plant fiber to form a super-hydrophobic particle coating, which is evenly dispersed in the three-dimensional network structure of the plant dimensional intersection, realizing a micro-nano hydrophobic structure. Its microscopic rough surface can reduce the adhesion area of ​​dust. At the same time, nano-silica has a certain self-cleaning ability, making it difficult for dust to adhere and easy to clean; low-temperature plasma treatment is then used to coat the surface of the nano-modified silica plant fiber to modify the surface, exposing more active binding sites, so that the plant fibers are combined with each other in the base material to form a three-dimensional network structure, while improving the compatibility and dispersibility of the plant fibers and polyethylene; finally, polymethyl methacrylate physical coating is used to load modified nano-silica and micron-sized carbon powder on the surface of the semi-finished plastic wood floor to form a rough structure that synergizes the inner and outer layers with double-effect hydrophobicity.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a dustproof and moisture-proof plastic wood floor, characterized in that: The method comprises the following preparation steps: (1) Soaking the organic amine functionalized nano-silica in a dimethyl sulfoxide solution of chloromethane at a solid-liquid ratio of 1-3:20, heating to 50-60°C, reacting under stirring at a speed of 60-120 rpm, and finally cooling to room temperature, filtering, washing the solid with dimethyl sulfoxide for 3 times, and then drying at 30°C for 5 hours to obtain the modified nano-silica; (2) uniformly applying the coating on the surface of the initially modified plant fiber so that the coating thickness is 1-3 μm, and drying at 60° C. for 50-100 min to obtain the coated plant fiber; introducing the coated plant fiber into a plasma atmosphere zone for plasma surface modification to obtain a modified plant fiber; (3) Dissolve polymethyl methacrylate in acetone, stir magnetically for 24 hours at a constant temperature of 0°C and a closed condition at a stirring speed of 200 rpm, then add modified nano-silicon dioxide and carbon powder with a particle size of 1-3 μm, stir electrically for 30 minutes at a stirring speed of 200 rpm to obtain a suspension; place the prepared board in the above suspension, pull and immerse it back and forth 100-200 times, and dry it at a constant temperature of 80°C for 2 hours to obtain a dust-proof and moisture-proof plastic wood floor.

2. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 1, characterized in that: The preparation method of organic amine functionalized nano-silica in step (1) is as follows: 5 parts of chloropropyltrimethoxysilane are added to 20-40 parts of cyclohexane to prepare a solution, ultrasonically dispersed for 30 minutes at a power of 50KHz, 3-5 parts of nano-silica are added thereto after the solution is evenly dispersed, and then ultrasonically oscillated at a power of 50-70KHz for 1-3 hours; after the solution is completed, the sample is extracted with toluene for 8 hours, and vacuum dried at 100°C for 8 hours with a vacuum degree of -0.085MPa to obtain an intermediate product; then 1-3 parts of tetrahydropyrrole are added to 30 parts of the cyclohexane solution, and after the solution is evenly dispersed at a power of 40-50KHz, the above 3-4 parts of the intermediate product are immersed therein, and the solution is sealed; then ultrasonically oscillated at a power of 50-70KHz for 0.5-1.5 hours; after the solution is completed, the sample is extracted with toluene for 8 hours, and then vacuum dried at 100°C for 8 hours with a vacuum degree of -0.085MPa to obtain the organic amine functionalized nano-silica.

3. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 1, characterized in that: The concentration of methyl chloride in the dimethyl sulfoxide solution of methyl chloride in step (1) is 70 wt %.

4. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 1, characterized in that: The preparation method of the preliminary modified plant fiber in step (2) is as follows: 0.3-0.6 g of plant fiber is placed in a small beaker, and placed in a sealed container together with 100 μL of methyltrimethoxysilane and 200 μL of deionized water, and heated at 95-105° C. for 4-6 hours to complete the preliminary modification of the plant fiber.

5. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 1, characterized in that: The preparation method of the plant fiber coating liquid in step (2) is as follows: 0.2-0.8 g of modified nano-silicon dioxide is added to 20 ml of tetrahydrofuran and ultrasonicated for 1 h to obtain liquid A, with the ultrasonic power being 35 kHz; 0.35-1.05 g of polydimethoxysilane is added to 20 ml of tetrahydrofuran and ultrasonicated for 30 min, with the ultrasonic power being 35 kHz; then 0.035 g of benzoyl peroxide, a curing agent of polydimethoxysilane, is added, and the ultrasonication is continued for 10 min to obtain liquid B; liquid A and liquid B are mixed and stirred for 10 min at a stirring speed of 120 rpm to obtain the plant fiber coating liquid.

6. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 1, characterized in that: The plasma modification parameters in step (2) are: the distance between the upper surface of the fiber bundle and the nozzle is 5 MM, the distance between the lower surface of the fiber bundle and the nozzle is less than 20 MM, the power is 40 W, the plasma is helium, and the processing time is 2-24 s.

7. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 1, characterized in that: The preparation method of the board in step (3) is as follows: the modified plant powder is hot-mixed with a mixed powder of PVC powder, dimethyldichlorosilane, calcium stearate and a stabilizer, the raw material components are evenly mixed by a high-speed mixer, a mixture is obtained at 100-140° C., the mixture is put into an extruder or an injection molding machine, and a sheet is produced at 125° C., and a board is formed by hot pressing at 120° C. and 30 MPa.

8. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 7, characterized in that: The mass ratio of the modified plant powder, PVC powder, dimethyldichlorosilane, calcium stearate and stabilizer is 15-25:100:2-9:1-3:1-10.

9. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 7, characterized in that: The stabilizer is 2,6-di-tert-butyl-4-methylphenol.

10. The method for preparing a dustproof and moisture-proof plastic wood floor according to claim 1, characterized in that: In the step (3), the mass volume ratio of polymethyl methacrylate, acetone, modified nano-silicon dioxide and carbon powder is 0.5-1:1:0.1-0.3:0.1-0.2.

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