A kind of imitated wood reinforced wear-resistant composite floor and its preparation method

Abstract

The application discloses a kind of imitated real wood reinforced wear-resistant composite floor and preparation method thereof, it is related to reinforced composite floor technical field.The application is used to solve the technical problem that the hierarchical structure and hierarchical raw material of reinforced composite floor need to be improved, to improve the flame retardancy, strength and water resistance by crosslinking interpenetrating network or adhesive modification;Composite floor includes from outside to inside stain-resistant waterproof film layer, tackifying weather-resistant curing layer and flame-retardant reinforcing substrate layer;Flame-retardant reinforcing adhesive in flame-retardant reinforcing substrate layer compensates the risk of evaporation and board explosion of crystal water in chloromagnesium-based adhesive during hot pressing, good bonding of wood fiber powder is carried out at the same time, crosslinking interpenetrating network is formed with chloromagnesium-based adhesive, and the flame retardancy, strength and water resistance of substrate layer are improved;The introduction of stain-resistant waterproof film layer improves the stain resistance, water resistance and wear resistance of composite floor on the basis of protecting tackifying weather-resistant curing layer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of reinforced composite floor, and particularly relates to a simulated solid wood reinforced wear-resistant composite floor and a preparation method thereof. BACKGROUND

[0002] The reinforced composite floor is usually glued by fiberboard, and has the advantages of good stability, strong deformation resistance, wear resistance, high surface hardness, good compression resistance, good stain resistance, easy maintenance, convenient installation, relatively low price, and rich and varied color and texture. However, the reinforced composite floor has the disadvantages of poor foot comfort, fear of water, and being basically scrapped after soaking in water, and some inferior products may have excessive formaldehyde, which has a great impact on human health.

[0003] An invention patent with the authorized announcement number CN105415815B discloses a moisture-proof reinforced wood floor and a manufacturing method thereof. A metal film is plated on the surface of the high-density fiberboard, which effectively isolates the contact between the reinforced wood floor substrate and air water molecules, keeps the moisture in the reinforced wood floor substrate constant, and effectively solves the deformation of the reinforced wood floor caused by the change in water content. The metal film can reduce the formaldehyde release amount, and the metal film can also improve the heat conduction performance of the floor, which can be used for geothermal floor. An invention patent with the application publication number CN114645608A discloses a reinforced floor and a preparation method thereof. The reinforced floor includes a substrate and a curing layer. The raw material of the substrate contains a first base material and modified chloromagnesium cement, and the raw material of the curing layer includes a second base material and a flame-retardant modified resin. The first base material is selected from cellulose materials and / or inorganic mineral materials, and the second base material is selected from organic materials or inorganic materials. The reinforced floor has the characteristics of water resistance, flame retardation, formaldehyde-free, and high bonding strength. However, research shows that the hierarchical structure and hierarchical raw material of the reinforced composite floor need to be improved in order to improve the flame retardation, strength, and water resistance through cross-linking interpenetrating network or adhesive modification. SUMMARY

[0004] The present application aims to provide a simulated solid wood reinforced wear-resistant composite floor and a preparation method thereof, which solves the technical problem that the hierarchical structure and hierarchical raw material of the reinforced composite floor need to be improved in order to improve the flame retardation, strength, and water resistance through cross-linking interpenetrating network or adhesive modification in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] The application provides a kind of imitated wood reinforced wear-resistant composite floor, including by outside to inside sequentially arranged dirt-resistant waterproof film layer, tackifying weather-resistant curing layer and flame-retardant reinforcing substrate layer;Tackifying weather-resistant curing layer is prepared from the following ingredients by weight parts: 75-90 parts of wood fiber powder, 12-18 parts of epoxy resin, 3-10 parts of ammonium polyphosphate and 1.2-2.5 parts of N-aminoethyl piperazine;Flame-retardant reinforcing substrate layer is prepared from the following ingredients by weight parts: 110-130 parts of wood fiber powder, 0.3-0.9 parts of magnesium sulfate, 8-13 parts of magnesium chloride, 0.5-2 parts of magnesium chloride hexahydrate, 5-10 parts of calcium sulfate and 26-37 parts of flame-retardant reinforcing adhesive;Among them, the wood fiber powder is selected from poplar powder with particle size of 10-100 mesh, and the water content is less than 0.1%.

[0007] As a further improved scheme of the application, the preparation method of the flame-retardant reinforcing adhesive comprises the following steps:

[0008] A1, the hexagonal boron nitride crystal powder is placed in a muffle furnace, heated to 560-580℃ at a heating rate of 12-18℃ / min, and kept for 4 hours, and then naturally cooled to room temperature to obtain block-shaped hexagonal boron nitride powder; then heated to 600-620℃ at a heating rate of 8-12℃ / min, and kept for 3 hours, and then naturally cooled to obtain hexagonal boron nitride nanosheets;

[0009] A2, the hexagonal boron nitride nanosheets are added to N,N-dimethylformamide to prepare a 1 mol / L solution a, and then aniline is added and ultrasonically dispersed for 30 min for standby, and ammonium persulfate is added to N,N-dimethylformamide to prepare a 1 mol / L solution b; the solution a is added dropwise into the solution b, heated to 50-60℃, and kept for 24-26 hours, and then the reaction liquid is reduced pressure filtered, the filter cake is washed with ethanol, and then 2-carboxyethyl phenyl hypophosphoric acid is added and ground to obtain a flame-retardant reinforcing powder;

[0010] A3, the epoxy resin and the flame-retardant reinforcing powder are mixed by centrifugation at a speed of 1000-1200 rpm for 30 min, and then sealed at room temperature for standby.

[0011] As a further improved scheme of the application, the use amount ratio of the hexagonal boron nitride nanosheets, aniline, ammonium persulfate and 2-carboxyethyl phenyl hypophosphoric acid is 1g:25g:0.18mol:0.1-0.3g.

[0012] As a further improved scheme of the application, the dirt-resistant waterproof film layer is obtained by scraping and drying dirt-resistant waterproof film material, and the preparation method of the dirt-resistant waterproof film material comprises the following steps:

[0013] B1, polyvinyl alcohol particles are added to distilled water, stirred in a water bath at 90 DEG C for 1 hour, naturally cooled to 80 DEG C, dropwise add glutaraldehyde, stirring for 30 min, dropwise add dimethyl phthalate, stirring for 30 min, to obtain polyvinyl alcohol glue solution;

[0014] B2, to the polyvinyl alcohol glue solution, sequentially add sodium lignosulfonate, nitrile rubber powder and borax, heated to 40-60 DEG C, heat stirring for 20-30 min, to obtain a stain-resistant waterproof film material.

[0015] As a further improved aspect of the application, the amount of polyvinyl alcohol particles, glutaraldehyde, dimethyl phthalate is 18-22g: 15-20g: 3-6g; the amount of polyvinyl alcohol glue solution, sodium lignosulfonate, nitrile rubber powder, borax is 32-40g: 3-6g: 0.3-0.8g: 1.5-3g.

[0016] The application also provides a preparation method of the above-mentioned imitation wood reinforced wear-resistant composite floor, comprising the following steps:

[0017] S1, chloromagnesium-based adhesive preparation: magnesium chloride and magnesium chloride hexahydrate are added to a mixer, stirred uniformly at a speed of 400-600 rpm, and then magnesium sulfate is added, mixed uniformly, ground, and filtered to obtain a chloromagnesium-based adhesive;

[0018] S2, preparation of flame-retardant reinforced substrate layer: the chloromagnesium-based adhesive is uniformly mixed with wood fiber powder, calcium sulfate and flame-retardant reinforcing adhesive, and then hot-pressed at a pressure of 3-5 MPa at 100-120 DEG C for 3-5 min to obtain a flame-retardant reinforced substrate layer;

[0019] S3, preparation of tackifying weather-resistant curing layer: wood fiber powder, epoxy resin, ammonium polyphosphate and N-aminoethyl piperazine are added to a mixer, stirred uniformly at 120-140 DEG C, and then poured into a molding mold to obtain a tackifying weather-resistant curing layer after cooling and molding;

[0020] S4, hot pressing: the tackifying weather-resistant curing layer with appropriate size is placed on the flame-retardant reinforced substrate layer, and hot-pressed at a temperature of 160-180 DEG C and a pressure of 6-8 MPa for 1-3 min to obtain a composite floor semi-finished product after cooling and molding;

[0021] S5, scraping and drying: the stain-resistant waterproof film material is uniformly scraped on the upper surface of the composite floor semi-finished product, and naturally dried in the wind to obtain an imitation wood reinforced wear-resistant composite floor with a stain-resistant waterproof film layer.

[0022] As described above, due to the adoption of the above technical solutions, the application has the following advantages:

[0023] 1. The imitation wood reinforced wear-resistant composite floor of the present application comprises, from outside to inside, a stain-resistant waterproof film layer, a tackiness weather-resistant curing layer and a flame-retardant reinforcing substrate layer; the flame-retardant reinforcing substrate layer mainly comprises wood fiber powder, a chloromagnesium-based adhesive prepared by compounding magnesium sulfate, magnesium chloride and magnesium chloride hexahydrate, and a halogen-resistant reinforcing agent calcium sulfate and a flame-retardant reinforcing adhesive; the flame-retardant reinforcing adhesive compensates for the risk of evaporation and board explosion of the crystallization water in the chloromagnesium-based adhesive during hot pressing, and forms a crosslinked interpenetrating network with the chloromagnesium-based adhesive to improve the flame retardancy, strength and waterproofness of the substrate layer; the tackiness weather-resistant curing layer mainly comprises wood fiber powder, an adhesive epoxy resin, a flame retardant ammonium polyphosphate and a curing agent N-aminoethyl piperazine; the epoxy resin is well bonded to the wood fiber powder, the ammonium polyphosphate is dispersed in the crosslinked network of the epoxy resin, and after the reaction and curing of the N-aminoethyl piperazine, an interface with adhesion, flame retardancy and corrosion resistance is formed on the surface; the introduction of the stain-resistant waterproof film layer improves the stain resistance, waterproofness and wear resistance of the composite floor, and the texture is similar to that of real wood.

[0024] 2. The flame-retardant reinforcing adhesive of the present application first separates the two-dimensional layered hexagonal boron nitride crystal powder by high-temperature calcination to increase the interlayer spacing; aniline is in-situ polymerized under the oxidation of ammonium persulfate, which not only avoids the agglomeration of boron nitride, but also synthesizes a polyaniline boron nitride hybrid material with good chemical stability and conductivity; doping with halogen-free flame retardant 2-carboxyethyl phenyl hypophosphoric acid and then grinding obtains a flame-retardant reinforcing powder with significantly improved limiting oxygen index, stability and strength; the flame-retardant reinforcing powder is dispersed in the crosslinked network of the epoxy resin, and a covalent bond of the reinforcing interfacial interaction is formed between polyaniline and the epoxy chain, which has good adhesion and flame retardancy.

[0025] 3. The stain-resistant waterproof film layer of the present application, polyvinyl alcohol and glutaraldehyde undergo a hydroxy aldehyde condensation reaction, and then mixed with diethyl phthalate to obtain a polyvinyl alcohol adhesive solution; the polyvinyl alcohol adhesive solution is compounded with biodegradable sodium lignosulfonate, wear-resistant and toughening nitrile rubber powder and borax with strong complexing ability of hydroxyl groups to obtain a stain-resistant waterproof film material; after drying, it can form a complexed water hydroxyl group, and has good wear resistance, toughness and waterproofness. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Fig. 1The layer structure diagram of the imitation solid wood reinforced wear-resistant composite flooring of the present invention is shown;

[0028] Fig. 2 A flowchart illustrating the preparation method of the imitation solid wood reinforced wear-resistant composite flooring of the present invention is shown.

[0029] Reference numerals: 100, stain-resistant and waterproof membrane layer; 200, tackifying and weather-resistant curing layer; 300, flame-retardant reinforced substrate layer. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figs. 1-2 As shown, this embodiment of a simulated solid wood reinforced wear-resistant composite floor includes, from the outside to the inside, a stain-resistant and waterproof membrane layer 100, an tackifying and weather-resistant curing layer 200, and a flame-retardant reinforced substrate layer 300. The tackifying and weather-resistant curing layer 200 is prepared from the following components by weight: 762g wood fiber powder, 135g epoxy resin E51, 38g ammonium polyphosphate, and 14g N-aminoethylpiperazine. The flame-retardant reinforced substrate layer 300 is prepared from the following components by weight: 1108g wood fiber powder, 5g magnesium sulfate, 83g magnesium chloride, 7g magnesium chloride hexahydrate, 55g calcium sulfate, and 280g flame-retardant reinforced adhesive. The wood fiber powder is selected from poplar powder with a particle size of 10-100 mesh and a moisture content of less than 0.1%.

[0033] The preparation method of flame-retardant reinforced adhesive includes the following steps:

[0034] A1. Hexagonal boron nitride crystal powder was placed in a muffle furnace and heated to 570°C at a heating rate of 15°C / min. The temperature was held for calcination for 4 hours and then naturally cooled to room temperature to obtain bulk hexagonal boron nitride powder. Then, the temperature was increased to 612°C at a heating rate of 10°C / min and held for calcination for 3 hours. After natural cooling, hexagonal boron nitride nanosheets were obtained.

[0035] A2, 10 g of hexagonal boron nitride nanosheet was added into N, N-dimethylformamide to prepare a 1 mol / L solution a, 250 g of aniline was added, and ultrasonic dispersion was performed for 30 min for standby, 410.8 g of ammonium persulfate was added into N, N-dimethylformamide to prepare a 1 mol / L solution b; solution a was added dropwise into solution b, and the temperature was increased to 56℃, and the reaction was stirred for 25 hours, the reaction solution was reduced pressure filtration, the filter cake was washed by ethanol, then 1.8 g of 2-carboxyethyl phenyl phosphinic acid was added, and grinding was performed to obtain a flame-retardant reinforcing powder;

[0036] A3, the epoxy resin E51 and the flame-retardant reinforcing powder were mixed at a mass ratio of 7:1 under centrifugal speed of 1100 rpm for 30 min, and the mixture was sealed for standby at room temperature.

[0037] The dirt-resistant waterproof film layer was obtained by scraping and drying the dirt-resistant waterproof film material, and the preparation method of the dirt-resistant waterproof film material included the following steps:

[0038] B1, 20 g of polyvinyl alcohol particles was added into distilled water, and stirring was performed at 90℃ water bath for 1 hour, and then the temperature was naturally reduced to 80℃, 17 g of glutaraldehyde was added dropwise, and stirring was performed for 30 min, 4 g of dimethyl phthalate was added dropwise, and stirring was performed for 30 min to obtain polyvinyl alcohol glue solution;

[0039] B2, 4.5 g of sodium lignosulfonate, 0.6 g of nitrile rubber powder and 2.3 g of borax were sequentially added into 38 g of polyvinyl alcohol glue solution, the temperature was increased to 53℃, and stirring was performed for 26 min to obtain the dirt-resistant waterproof film material;

[0040] The preparation method of the wood-like reinforced wear-resistant composite floor of the embodiment included the following steps:

[0041] S1, the preparation of the magnesium chloride-based adhesive: magnesium chloride and magnesium chloride hexahydrate were added into a mixing machine, and stirring was performed at 550 rpm until uniform, then magnesium sulfate was added, and after uniform mixing, grinding and filtration were performed to obtain the magnesium chloride-based adhesive;

[0042] S2, the preparation of the flame-retardant reinforcing substrate layer: the magnesium chloride-based adhesive was uniformly mixed with wood fiber powder, calcium sulfate and flame-retardant reinforcing adhesive, and hot pressing was performed at 108℃ and a pressure of 3.6 MPa for 5 min to obtain the flame-retardant reinforcing substrate layer;

[0043] S3, the preparation of the tackifying weather-resistant curing layer: wood fiber powder, epoxy resin E51, ammonium polyphosphate and N-aminoethyl piperazine were added into a mixing machine, and stirring was performed at 130℃ until uniform, then the mixture was poured into a forming mold, and cooling and molding were performed to obtain the tackifying weather-resistant curing layer;

[0044] S4, hot pressing and molding: the size-adapted tackifying weather-resistant curing layer was placed on the top of the flame-retardant reinforcing substrate layer, and hot pressing was performed at a temperature of 166℃ and a pressure of 7 MPa for 2 min to obtain the composite floor semi-finished product;

[0045] S5. Scraping and Drying: Apply the stain-resistant and waterproof membrane material evenly to the upper surface of the composite flooring semi-finished product and allow it to dry naturally in the sheltered environment to obtain imitation solid wood reinforced wear-resistant composite flooring with a stain-resistant and waterproof membrane layer.

[0046] Example 2

[0047] like Figs. 1-2 As shown, this embodiment of a simulated solid wood reinforced wear-resistant composite floor includes, from the outside to the inside, a stain-resistant and waterproof membrane layer 100, an tackifying and weather-resistant curing layer 200, and a flame-retardant reinforced substrate layer 300. The tackifying and weather-resistant curing layer 200 is prepared from the following components by weight: 840g wood fiber powder, 165g epoxy resin E51, 65g ammonium polyphosphate, and 18g N-aminoethylpiperazine. The flame-retardant reinforced substrate layer 300 is prepared from the following components by weight: 1200g wood fiber powder, 62g magnesium sulfate, 105g magnesium chloride, 13g magnesium chloride hexahydrate, 75g calcium sulfate, and 330g flame-retardant reinforced adhesive. The wood fiber powder is selected from poplar powder with a particle size of 10-100 mesh and a moisture content of less than 0.1%.

[0048] The preparation method of flame-retardant reinforced adhesive includes the following steps:

[0049] A1. Hexagonal boron nitride crystal powder was placed in a muffle furnace and heated to 572°C at a heating rate of 16°C / min. The temperature was held for calcination for 4 hours and then naturally cooled to room temperature to obtain bulk hexagonal boron nitride powder. Then, the temperature was increased to 618°C at a heating rate of 11°C / min and held for calcination for 3 hours. After natural cooling, hexagonal boron nitride nanosheets were obtained.

[0050] A2. 10g of hexagonal boron nitride nanosheets were added to N,N-dimethylformamide to prepare a 1mol / L solution a. Then, 250g of aniline was added, and the mixture was ultrasonically dispersed for 30min. 410.8g of ammonium persulfate was added to N,N-dimethylformamide to prepare a 1mol / L solution b. Solution a was added dropwise to solution b, the temperature was raised to 58℃, and the mixture was stirred for 26 hours. The reaction solution was filtered under reduced pressure. The filter cake was washed with ethanol, and 2.8g of 2-carboxyethylphenyl hypophosphoric acid was added. The mixture was then ground to obtain a flame-retardant reinforced powder.

[0051] A3. Mix epoxy resin E51 and flame-retardant reinforcing powder at a mass ratio of 5.8:1 by centrifugation at 1200 rpm for 30 min, and then seal at room temperature for later use.

[0052] The stain-resistant and waterproof membrane layer is obtained by coating and drying a stain-resistant and waterproof membrane material. The preparation method of the stain-resistant and waterproof membrane material includes the following steps:

[0053] B1, 20 g of polyvinyl alcohol particles were added to distilled water, stirred in a water bath at 90°C for 1 hour, naturally cooled to 80°C, 17 g of glutaraldehyde was added dropwise, stirred for 30 min, 3.8 g of dimethyl phthalate was added dropwise, stirred for 30 min, and polyvinyl alcohol glue solution was obtained;

[0054] B2, 3.5 g of sodium lignosulfonate, 0.4 g of nitrile rubber powder and 2.8 g of borax were added to 35 g of polyvinyl alcohol glue solution in turn, heated to 56°C, and stirred for 22 min, to obtain a stain-resistant waterproof film material.

[0055] The preparation method of the wood-like reinforced wear-resistant composite floor of the embodiment is different from that of example 1 in that step S2 is hot pressing at 118°C and a pressure of 4.8 MPa for 4 min, and the flame-retardant reinforced substrate layer is obtained by cooling and forming; step S3 is stirring uniformly at 135°C, then pouring into a forming mold, and cooling and forming to obtain the adhesion-resistant weather-resistant cured layer; and step S4 is hot pressing at a temperature of 175°C and a pressure of 7.5 MPa for 3 min to cool and form the composite floor semi-finished product.

[0056] Example 3

[0057] As shown in Figs. 1-2 , the wood-like reinforced wear-resistant composite floor of the embodiment comprises, from the outside to the inside, a stain-resistant waterproof film layer 100, an adhesion-resistant weather-resistant cured layer 200 and a flame-retardant reinforced substrate layer 300; the adhesion-resistant weather-resistant cured layer 200 is prepared from the following components by weight: 890 g of wood fiber powder, 176 g of epoxy resin E51, 98 g of ammonium polyphosphate and 24 g of N-aminoethyl piperazine; the flame-retardant reinforced substrate layer 300 is prepared from the following components by weight: 1290 g of wood fiber powder, 9 g of magnesium sulfate, 128 g of magnesium chloride, 19 g of magnesium chloride hexahydrate, 95 g of calcium sulfate and 362 g of flame-retardant reinforcing adhesive; wherein the wood fiber powder is selected from poplar powder with a particle size of 10-100 mesh, and the water content is less than 0.1%.

[0058] The preparation method of the flame-retardant reinforcing adhesive comprises the following steps:

[0059] A1, hexagonal boron nitride crystal powder was placed in a muffle furnace, heated to 578°C at a heating rate of 18°C / min, and heat treated for 4 hours, then naturally cooled to room temperature to obtain block-shaped hexagonal boron nitride powder; then heated to 615°C at a heating rate of 11°C / min, and heat treated for 3 hours, then naturally cooled to obtain hexagonal boron nitride nanosheets;

[0060] A2, 10 g of hexagonal boron nitride nanosheet was added into N,N-dimethylformamide to prepare a 1 mol / L solution a, 250 g of aniline was added, and ultrasonic dispersion was performed for 30 min to prepare a solution b, 410.8 g of ammonium persulfate was added into N,N-dimethylformamide to prepare a 1 mol / L solution b; the solution a was added dropwise into the solution b, and the temperature was increased to 60℃, and the reaction was stirred for 24.5 hours; the reaction solution was reduced pressure filtration, the filter cake was washed by ethanol, and then 3 g of 2-carboxyethyl phenyl phosphinic acid was added, and grinding was performed to obtain a flame-retardant reinforcing powder;

[0061] A3, the epoxy resin E51 and the flame-retardant reinforcing powder were mixed at a mass ratio of 7.8:1 under the centrifugal speed of 1160 rpm for 30 min, and the mixture was sealed at room temperature for standby.

[0062] The dirt-resistant waterproof film layer was obtained by scraping and drying the dirt-resistant waterproof film material, and the preparation method of the dirt-resistant waterproof film material included the following steps:

[0063] B1, 22 g of polyvinyl alcohol particles was added into distilled water, and stirring was performed under a water bath at 90℃ for 1 hour, and then the temperature was naturally decreased to 80℃, 19 g of glutaraldehyde was added dropwise, and stirring was performed for 30 min, 5.8 g of dimethyl phthalate was added dropwise, and stirring was performed for 30 min to obtain a polyvinyl alcohol glue solution;

[0064] B2, 6 g of sodium lignosulfonate, 0.8 g of nitrile rubber powder and 2.3 g of borax were sequentially added into 40 g of the polyvinyl alcohol glue solution, the temperature was increased to 58℃, and stirring was performed for 30 min to obtain a dirt-resistant waterproof film material.

[0065] The preparation method of the wood-like reinforced wear-resistant composite floor of the embodiment was different from that of example 1 in that step S2 was hot pressing at 120℃ under a pressure of 5 MPa for 5 min, and the flame-retardant reinforcing base material layer was obtained by cooling and molding; step S3 was stirring uniformly at 138℃, and then pouring into a molding mold, and the tackiness weather-resistant cured layer was obtained by cooling and molding; and step S4 was hot pressing at a temperature of 180℃ and a pressure of 6.5 MPa for 2 min to obtain the composite floor semi-finished product.

[0066] Comparative example 1

[0067] The comparative example provided a wood-like reinforced wear-resistant composite floor and a preparation method thereof, and the difference from example 3 was that the dirt-resistant waterproof film layer was cancelled.

[0068] Comparative example 2

[0069] The comparative example provided a wood-like reinforced wear-resistant composite floor and a preparation method thereof, and the difference from example 3 was that the hexagonal boron nitride was not added into the flame-retardant reinforcing adhesive of the flame-retardant reinforcing base material layer.

[0070] Comparative example 3

[0071] The comparative example provides a kind of imitation wood reinforced wear-resistant composite floor and its preparation method, and the difference from example 3 is that magnesium sulfate and magnesium chloride hexahydrate are not added during preparation of the fire-retardant reinforced substrate layer.

[0072] Experimental example

[0073] For the imitation wood reinforced wear-resistant composite floor products prepared in examples 1-3 and comparative examples 1-3, appearance and related physical and chemical properties were tested. Specifically, according to the industry standard LY / T 1738-2020 "Plywood for solid wood composite floor", the discoloration, decay, blistering and delamination after 30 days of placement in a naturally ventilated indoor environment were observed in terms of appearance, and the moisture content, static bending strength, elastic modulus and formaldehyde emission of the product after preparation were tested in terms of physical and chemical properties. The specific experimental results are shown in the following table:

[0074]

[0075]

[0076] From the experimental results in the above table, it can be seen that the composite floor product prepared in the examples of the present application meets the requirements in terms of appearance, and the static bending strength, elastic modulus are good, and the formaldehyde emission is small; It shows that the mechanical and physical properties of the composite floor are good, and the internal formaldehyde is basically completely absorbed and removed, safe and environmentally friendly, and has a long service life. Comparative example 1 cannot form a film layer with good wear resistance, toughness and water resistance by canceling the stain-resistant and waterproof film layer, which is easy to wear and discolor after being contaminated by oil stains, and the static bending strength, elastic modulus is reduced to a certain extent, and the barrier removal effect of volatile gases such as formaldehyde is reduced. Comparative example 2 cannot improve the strength and flame retardant properties of the fire-retardant reinforced adhesive by not adding hexagonal boron nitride in the fire-retardant reinforced adhesive, which reduces the adhesion and compactness of the fire-retardant reinforced substrate layer, and slightly reduces the mechanical and physical properties. Comparative example 3 cannot generate a magnesium chloride-based adhesive to further form a crosslinked interpenetrating network because magnesium sulfate and magnesium chloride hexahydrate are not added during preparation of the fire-retardant reinforced substrate layer, which reduces the flame retardancy, strength and water resistance of the substrate layer.

[0077] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

[0078] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to provide the best illustration of the application and its practical application to those skilled in the art and to enable those skilled in the art to utilize the application in its best mode. The application is only limited by the claims and their full scope and equivalents.

Claims

1. A type of imitation solid wood reinforced wear-resistant composite flooring, characterized in that, The product comprises, from the outside to the inside, a stain-resistant and waterproof membrane layer (100), a tackifying and weather-resistant curing layer (200), and a flame-retardant reinforced substrate layer (300). The tackifying and weather-resistant curing layer (200) is prepared from the following components in parts by weight: 75-90 parts wood fiber powder, 12-18 parts epoxy resin, 3-10 parts ammonium polyphosphate, and 1.2-2.5 parts N-aminoethylpiperazine. The flame-retardant reinforced substrate layer (300) is prepared from the following components in parts by weight: 110-130 parts wood fiber powder, 0.3-0.9 parts magnesium sulfate, 8-13 parts magnesium chloride, 0.5-2 parts magnesium chloride hexahydrate, 5-10 parts calcium sulfate, and 26-37 parts flame-retardant reinforced adhesive. The wood fiber powder is selected from poplar wood powder with a particle size of 10-100 mesh and a moisture content of less than 0.1%. The preparation method of the flame-retardant reinforced adhesive includes the following steps: A1. Hexagonal boron nitride crystal powder was placed in a muffle furnace and heated to 560-580°C at a heating rate of 12-18°C / min. The temperature was held for calcination for 4 hours, and then naturally cooled to room temperature to obtain bulk hexagonal boron nitride powder. Then, the temperature was increased to 600-620°C at a heating rate of 8-12°C / min and held for calcination for 3 hours. After natural cooling, hexagonal boron nitride nanosheets were obtained. A2. Prepare a 1 mol / L solution a by adding hexagonal boron nitride nanosheets to N,N-dimethylformamide, then add aniline and ultrasonically disperse for 30 min. Prepare a 1 mol / L solution b by adding ammonium persulfate to N,N-dimethylformamide. Add solution a dropwise to solution b, heat to 50-60℃, keep warm and stir for 24-26 hours, filter the reaction solution under reduced pressure, wash the filter cake with ethanol, add 2-carboxyethylphenyl hypophosphoric acid, and grind to obtain flame-retardant reinforced powder. A3. Mix epoxy resin and flame-retardant reinforcing powder at a mass ratio of 5~8:1 by centrifugation at 1000~1200 rpm for 30 minutes, and then seal at room temperature for later use.

2. The imitation solid wood reinforced wear-resistant composite flooring according to claim 1, characterized in that, The ratio of the hexagonal boron nitride nanosheets to aniline, ammonium persulfate, and 2-carboxyethylphenyl hypophosphoric acid is 1g:25g:0.18mol:0.1~0.3g.

3. The imitation solid wood reinforced wear-resistant composite flooring according to claim 1, characterized in that, The stain-resistant and waterproof membrane layer is obtained by coating and drying a stain-resistant and waterproof membrane material. The preparation method of the stain-resistant and waterproof membrane material includes the following steps: B1. Add polyvinyl alcohol granules to distilled water, stir in a 90°C water bath for 1 hour, cool naturally to 80°C, add glutaraldehyde dropwise, stir and react for 30 minutes, add dimethyl phthalate dropwise, stir and react for 30 minutes to obtain polyvinyl alcohol solution. B2, add sodium lignosulfonate, nitrile rubber powder and borax to polyvinyl alcohol solution in sequence, heat to 40~60℃, keep warm and stir for 20~30min to obtain stain-resistant and waterproof membrane material.

4. The imitation solid wood reinforced wear-resistant composite flooring according to claim 3, characterized in that, The ratio of polyvinyl alcohol particles to glutaraldehyde and dimethyl phthalate is 18-22g: 15-20g: 3-6g; the ratio of polyvinyl alcohol solution to sodium lignosulfonate, nitrile rubber powder and borax is 32-40g: 3-6g: 0.3-0.8g: 1.5-3g.

5. A method for preparing a simulated solid wood reinforced wear-resistant composite flooring according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Preparation of magnesium chloride-based binder: Add magnesium chloride and magnesium chloride hexahydrate to a mixer and stir evenly at 400~600 rpm. Add magnesium sulfate, mix evenly, grind and filter to obtain magnesium chloride-based binder; S2. Preparation of flame retardant reinforced substrate layer: Mix magnesium chloride-based binder with wood fiber powder, calcium sulfate and flame retardant reinforced adhesive evenly, hot press at 100~120℃ and pressure of 3~5MPa for 3~5min, cool and form to obtain flame retardant reinforced substrate layer; S3. Preparation of Tackifying and Weather-Resistant Curing Layer: Wood fiber powder, epoxy resin, ammonium polyphosphate and N-aminoethylpiperazine are added to a mixer and stirred evenly at 120~140℃. The mixture is then poured into a molding mold and cooled to form the tackifying and weather-resistant curing layer. S4. Hot pressing: Place the tackifying and weather-resistant curing layer of appropriate size on top of the flame-retardant reinforced substrate layer, and hot press for 1-3 minutes at a temperature of 160~180℃ and a pressure of 6~8MPa to obtain the composite flooring semi-finished product. S5. Scraping and Drying: Apply the stain-resistant and waterproof membrane material evenly to the upper surface of the composite flooring semi-finished product and allow it to dry naturally in the sheltered environment to obtain imitation solid wood reinforced wear-resistant composite flooring with a stain-resistant and waterproof membrane layer.

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