Wear-resistant ground heating floor and preparation method thereof

Abstract

The invention relates to the technical field of floor manufacturing, and discloses a wear-resistant ground heating floor and a preparation method thereof. According to the wear-resistant floor heating floor, the rock wood plate serves as the base material layer, the surface of the rock wood plate is coated with the polyurethane coating to serve as the wear-resistant layer, and due to coating of the polyurethane coating, the wear resistance of the floor is improved, and the heat resistance, flame retardance and water resistance of a base body are improved; wherein a coating formed by the polyurethane coating has certain excellent wear resistance, the wear resistance of the coating is further improved by introducing the reinforcing filler, and the heat resistance and flame retardance of the coating are further improved by introducing a heat-resistant group and a phosphate structure into the coating; in addition, the introduction of hydroxyl silicone oil also improves the hydrophobicity of the matrix, so that the water resistance of the coating is improved.

Description

Technical Field

[0001] The invention relates to the technical field of floor manufacturing, and in particular to a wear-resistant floor heating floor and a preparation method thereof. Background Art

[0002] Wear-resistant floor heating floor is a new type of floor decoration material that combines floor heating technology and floor wear resistance. It not only provides a comfortable indoor temperature regulation function, but also has high durability and aesthetics. Traditional floor materials include wood, tiles, stone, etc. Each material has its own specific thermal conductivity and wear resistance. However, the wear resistance of these materials is limited, which leads to a limited service life of the floor material. Therefore, it is usually necessary to use special surface treatment or add a wear-resistant layer to improve its durability.

[0003] Floor heating floors based on wood usually need to add a wear-resistant layer on the surface of the wooden floor to improve its wear resistance, and the wear-resistant layer is usually formed by applying a wear-resistant coating on the surface of the wooden floor. Wear-resistant coatings generally include polyurethane coatings, acrylic coatings, epoxy resin coatings, etc. Compared with other wear-resistant coatings, polyurethane coatings are more suitable for application on the surface of wooden floors. This is because polyurethane coatings not only have excellent wear resistance, pressure resistance, and impact resistance, but also have excellent elasticity and flexibility. They can effectively alleviate the expansion and contraction of wooden floors caused by floor heating, thereby protecting wooden floors from damage and maintaining the beauty and durability of wooden floors. In addition, considering that floor heating floors also require certain thermal conductivity, heat resistance, flame retardancy and water resistance, it is necessary to modify traditional polyurethane coatings and apply them on the surface of wooden floors to develop a floor heating floor with excellent wear resistance, thermal conductivity, heat resistance, flame retardancy and water resistance. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a wear-resistant floor heating floor and a preparation method thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A wear-resistant floor heating floor, comprising a base material layer and a wear-resistant layer, wherein the base material layer is a rock wood board, and the wear-resistant layer is obtained by uniformly coating a wear-resistant polyurethane coating on the surface of the rock wood board; The wear-resistant polyurethane coating comprises the following raw materials in parts by weight: 40-50 parts of modified polyurethane emulsion, 5-8 parts of reinforcing filler, 3-5 parts of zinc oxide, 1-3 parts of silane coupling agent, 0.1-0.5 parts of defoamer, 0.5-1 parts of thickener, 0.2-0.6 parts of leveling agent, 5-10 parts of deionized water, and 0.2-1 parts of film-forming aid; The modified polyurethane emulsion is prepared by the following steps: Step A1, dispersing 5-aminoisophthalic acid and triethylamine in dichloromethane, adding diphenyl chlorophosphate at 0-5°C, then heating to room temperature and stirring to react for 12-16h, filtering, washing and drying to obtain a carboxyl-terminated product; Step A2, 4,6-diaminoresorcinol hydrochloride, the carboxyl-terminated product and polyphosphoric acid are uniformly stirred, and the mixture is heated to 100-110° C. and stirred for reaction for 30-50 min, and then heated to 200-210° C. and reacted for 2-3 h, filtered, and the precipitate is collected and soaked in a 10 wt % sodium carbonate aqueous solution for 12 h, and then filtered, washed and dried to obtain a functionalized chain extender; Step A3, under nitrogen conditions, treating polyester polyol (Desmophen 1652) at 120°C for 3 hours, cooling to 90°C, adding isophorone diisocyanate and dibutyltin dilaurate, mixing and stirring for 30-40 minutes, and then adding a functional chain extender to continue the reaction for 2.5-3.5 hours to obtain a polyurethane prepolymer; Step A4, dispersing hydroxy silicone oil in tetrahydrofuran, adding polyurethane prepolymer, reacting under nitrogen at 60° C. for 2.5-3.5 hours, distilling off tetrahydrofuran at 80-90° C., adding deionized water and stirring evenly, to obtain a modified polyurethane emulsion; Further, in step A1, the usage ratio of 5-aminoisophthalic acid, triethylamine, dichloromethane and diphenyl chlorophosphate is 0.051-0.153 mol: 0.05-0.15 mol: 200 mL: 0.05-0.15 mol; Further, in step A2, the usage ratio of 4,6-diaminoresorcinol hydrochloride, carboxyl-terminated product, polyphosphoric acid and sodium carbonate aqueous solution is 0.02-0.06 mol: 0.01-0.03 mol: 16-50 g: 100 mL; Further, in step A3, the usage ratio of polyester polyol, isophorone diisocyanate, dibutyltin dilaurate and functional chain extender is 0.1 mol: 0.13-0.17 mol: 0.0005-0.001 mol: 0.01-0.03 mol; Furthermore, in step A4, the usage ratio of hydroxy silicone oil, tetrahydrofuran, polyurethane prepolymer and deionized water is 1-3 g: 50 mL: 10-15 g: 15-20 mL.

[0006] The reinforcing filler is prepared by the following steps: Step B1: Disperse thioacetamide and sodium molybdate evenly in deionized water, add graphene nanosheets and stir for 30 min, transfer to an autoclave, and react at 180-220 ° C for 18-24 h, cool to room temperature, wash and dry to obtain graphene / MoS 2 Composite materials; Step B2: Graphene / MoS 2 The composite material is ultrasonically dispersed in deionized water for 30-50 minutes, hexadecyltrimethylammonium bromide is added and stirred for 10 minutes, and then ultrasonically dispersed for 1-3 hours. After the reaction is completed, the composite material is filtered, washed and dried to obtain a reinforcing filler. Further, in step B1, the usage ratio of thioacetamide, sodium molybdate, deionized water and graphene nanosheets is 0.3-0.9 g: 0.15-0.45 g: 100 mL: 0.05-0.15 g; Furthermore, in step B2, graphene / MoS 2 The usage ratio of the composite material, deionized water and hexadecyltrimethylammonium bromide is 2g:50mL:0.1-0.5g.

[0007] A method for preparing a wear-resistant floor heating floor comprises the following steps: Step S1, weighing raw materials by weight, adding deionized water, reinforcing filler, zinc oxide, silane coupling agent, defoamer, thickener, leveling agent and film-forming aid to the modified polyurethane emulsion, stirring and dispersing, and obtaining a wear-resistant polyurethane coating; Step S2, evenly apply the wear-resistant polyurethane coating on the surface of the rock wood board, the thickness of the first coating is 0.5-0.8mm, the thickness of the second coating is 0.4-0.6mm, and dry to obtain the wear-resistant floor heating floor.

[0008] Beneficial effects of the present invention: The wear-resistant floor heating floor in the present invention adopts rock wood board as the base material layer, and polyurethane coating is coated on the surface as the wear-resistant layer. The coating of polyurethane coating not only improves the wear resistance of the floor, but also improves the heat resistance, flame retardancy and water resistance of the base. Among them, the coating formed by polyurethane coating itself has certain excellent wear resistance, and the wear resistance of the coating is further improved by introducing reinforcing fillers, and the heat-resistant groups and phosphate structures introduced into the coating also improve the heat resistance and flame retardancy of the coating. In addition, the introduction of hydroxy silicone oil also improves the hydrophobicity of the base, thereby improving the water resistance of the coating.

[0009] In the modified polyurethane emulsion, the -NH 2The method comprises the following steps: reacting a -Cl group in diphenyl chlorophosphate with a terminal carboxyl group product to generate a phosphate ester structure; then using 4,6-diaminoresorcinol hydrochloride and the terminal carboxyl group product to undergo a condensation reaction under the catalytic condition of polyphosphoric acid to synthesize a functional chain extender containing a benzoxazole structure; then using polyester polyol, isophorone diisocyanate and the functional chain extender as raw materials to synthesize a polyurethane prepolymer; finally, using hydroxy silicone oil to react with the polyurethane prepolymer to obtain a modified polyurethane emulsion. Functionalized chain extenders containing terminal amino structures and hydroxy silicone oil are introduced into the modified polyurethane emulsion, which improve the heat resistance, flame retardancy and water resistance of the coating; among them, the introduction of the heat-resistant group benzoxazole improves the heat resistance of the coating, because the group is a highly conjugated system composed of rigid heterocycles and benzene rings, which is highly ordered in the matrix and has excellent thermal stability. At the same time, the ring body with large steric hindrance can also hinder the relative movement of the molecular chain when heated, which is beneficial to improve the heat resistance of the matrix; the introduction of the phosphate structure can synergistically act with the graphene in the reinforcing filler to improve the flame retardant properties of the coating; in addition, the hydroxy silicone oil has a certain hydrophobicity. After being introduced into the matrix, the hydrophobicity of the matrix is ​​improved, thereby making the matrix have a certain water resistance.

[0010] The reinforcing filler uses graphene as the base material, and molybdenum disulfide is synthesized on its surface to obtain graphene / MoS 2 The composite material is surface treated with a surfactant to obtain a reinforcing filler; the reinforcing filler is introduced into the polyurethane coating to improve the wear resistance and thermal conductivity of the polyurethane coating. This is because the reinforcing filler has excellent dispersibility in the coating, and graphene can synergize with zinc oxide to form a thermal conductive network in the coating, which significantly improves the thermal conductivity of the floor; and molybdenum disulfide and graphene can also synergize to improve the wear resistance of the polyurethane coating. This is because both molybdenum disulfide and graphene have a lamellar structure, and the van der Waals force between layers is weak and easy to slide, so that they can provide self-lubricating effect with less friction in the matrix, thereby effectively improving the wear resistance of the coating and improving the wear resistance of the floor. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0012] The modified polyurethane emulsion is prepared by the following steps: Step A1, dispersing 0.051 mol of 5-aminoisophthalic acid and 0.05 mol of triethylamine in 200 mL of dichloromethane, adding 0.05 mol of diphenyl chlorophosphate at 0°C, then heating to room temperature and stirring to react for 12 hours, filtering, washing, and drying to obtain a carboxyl-terminated product; Step A2, 0.02 mol of 4,6-diaminoresorcinol hydrochloride, 0.01 mol of the carboxyl-terminated product and 16 g of polyphosphoric acid were stirred evenly, and the mixture was heated to 100° C. and stirred for reaction for 30 min, and then heated to 200° C. and reacted for 2 h, filtered, and the precipitate was collected and soaked in 100 mL of a 10 wt% sodium carbonate aqueous solution for 12 h, and then filtered, washed, and dried to obtain a functionalized chain extender; Step A3, under nitrogen conditions, 0.1 mol of polyester polyol (Desmophen 1652) was treated at 120°C for 3 hours, cooled to 90°C, 0.13 mol of isophorone diisocyanate and 0.0005 mol of dibutyltin dilaurate were added, mixed and stirred for 30 minutes, and then 0.01 mol of functional chain extender was added to continue the reaction for 2.5 hours to obtain a polyurethane prepolymer; Step A4: Disperse 1 g of hydroxy silicone oil in 50 mL of tetrahydrofuran, add 10 g of polyurethane prepolymer, react under nitrogen at 60° C. for 2.5 h, remove tetrahydrofuran by distillation at 80° C., add 15 mL of deionized water and stir evenly to obtain a modified polyurethane emulsion.

[0013] The reinforcing filler is prepared by the following steps: Step B1: Disperse 0.3 g of thioacetamide and 0.15 g of sodium molybdate in 100 mL of deionized water, add 0.05 g of graphene nanosheets and stir for 30 min, transfer to an autoclave, react at 180 ° C for 18 h, cool to room temperature, wash and dry to obtain graphene / MoS 2 Composite materials; Step B2: 2g graphene / MoS 2 The composite material was ultrasonically dispersed in 50 mL of deionized water for 30 min, 0.1 g of hexadecyltrimethylammonium bromide was added and stirred for 10 min, and then ultrasonically dispersed for 1 h. After the reaction was completed, the composite material was filtered, washed and dried to obtain a reinforced filler. Example 2

[0014] The modified polyurethane emulsion is prepared by the following steps: Step A1, dispersing 0.102 mol of 5-aminoisophthalic acid and 0.1 mol of triethylamine in 200 mL of dichloromethane, and adding 0.1 mol of diphenyl chlorophosphate at 2°C, then heating to room temperature and stirring to react for 14 hours, filtering, washing, and drying to obtain a carboxyl-terminated product; Step A2, 0.04 mol of 4,6-diaminoresorcinol hydrochloride, 0.02 mol of the terminal carboxyl product and 32 g of polyphosphoric acid were stirred evenly, and the mixture was heated to 105° C. and stirred for 40 min, and then heated to 205° C. for 2.5 h, filtered, and the precipitate was collected and soaked in 100 mL of a 10 wt% sodium carbonate aqueous solution for 12 h, and then filtered, washed, and dried to obtain a functionalized chain extender; Step A3: Under nitrogen conditions, 0.1 mol of polyester polyol (Desmophen 1652) was treated at 120°C for 3 hours, cooled to 90°C, 0.15 mol of isophorone diisocyanate and 0.00075 mol of dibutyltin dilaurate were added, mixed and stirred for 35 minutes, and then 0.02 mol of functional chain extender was added to continue the reaction for 3 hours to obtain a polyurethane prepolymer; Step A4: Disperse 2 g of hydroxy silicone oil in 50 mL of tetrahydrofuran, add 12 g of polyurethane prepolymer, react under nitrogen at 60° C. for 3 h, remove tetrahydrofuran by distillation at 85° C., add 17 mL of deionized water and stir evenly to obtain a modified polyurethane emulsion.

[0015] The reinforcing filler is prepared by the following steps: Step B1: Disperse 0.6 g of thioacetamide and 0.3 g of sodium molybdate in 100 mL of deionized water, add 0.01 g of graphene nanosheets and stir for 30 min, transfer to an autoclave, and react at 200 ° C for 21 h, cool to room temperature, wash and dry to obtain graphene / MoS 2 Composite materials; Step B2: 2g graphene / MoS 2 The composite material was ultrasonically dispersed in 50 mL of deionized water for 40 min, 0.3 g of hexadecyltrimethylammonium bromide was added and stirred for 10 min, and then ultrasonically dispersed for 2 h. After the reaction was completed, the composite material was filtered, washed and dried to obtain a reinforced filler. Example 3

[0016] The modified polyurethane emulsion is prepared by the following steps: Step A1, dispersing 0.153 mol of 5-aminoisophthalic acid and 0.15 mol of triethylamine in 200 mL of dichloromethane, adding 0.15 mol of diphenyl chlorophosphate at 5°C, then heating to room temperature and stirring to react for 16 hours, filtering, washing, and drying to obtain a carboxyl-terminated product; Step A2, 0.06 mol of 4,6-diaminoresorcinol hydrochloride, 0.03 mol of the terminal carboxyl product and 50 g of polyphosphoric acid were stirred evenly, and the mixture was heated to 110° C. and stirred for reaction for 50 min, and then heated to 210° C. for reaction for 3 h, filtered, and the precipitate was collected and soaked in 100 mL of a 10 wt% sodium carbonate aqueous solution for 12 h, and then filtered, washed, and dried to obtain a functionalized chain extender; Step A3, under nitrogen conditions, 0.1 mol of polyester polyol (Desmophen 1652) was treated at 120°C for 3 hours, cooled to 90°C, 0.17 mol of isophorone diisocyanate and 0.001 mol of dibutyltin dilaurate were added, mixed and stirred for 40 minutes, and then 0.03 mol of functional chain extender was added and the reaction was continued for 3.5 hours to obtain a polyurethane prepolymer; Step A4: Disperse 3 g of hydroxy silicone oil in 50 mL of tetrahydrofuran, add 15 g of polyurethane prepolymer, react under nitrogen at 60° C. for 3.5 h, remove tetrahydrofuran by distillation at 90° C., add 20 mL of deionized water and stir evenly to obtain a modified polyurethane emulsion.

[0017] The reinforcing filler is prepared by the following steps: Step B1: Disperse 0.9 g of thioacetamide and 0.45 g of sodium molybdate in 100 mL of deionized water, add 0.15 g of graphene nanosheets and stir for 30 min, transfer to an autoclave, react at 220 ° C for 24 h, cool to room temperature, wash and dry to obtain graphene / MoS 2 Composite materials; Step B2: 2g graphene / MoS 2 The composite material was ultrasonically dispersed in 50 mL of deionized water for 50 min, 0.5 g of hexadecyltrimethylammonium bromide was added and stirred for 10 min, and then ultrasonically dispersed for 3 h. After the reaction was completed, the composite material was filtered, washed and dried to obtain a reinforced filler. Example 4

[0018] A wear-resistant floor heating floor, comprising a base material layer and a wear-resistant layer, wherein the base material layer is a rock wood board, and the wear-resistant layer is obtained by uniformly coating a wear-resistant polyurethane coating on the surface of the rock wood board; The wear-resistant polyurethane coating comprises the following raw materials in parts by weight: 40 parts of the modified polyurethane emulsion prepared in Example 1, 5 parts of the reinforcing filler prepared in Example 1, 3 parts of zinc oxide, 1 part of silane coupling agent KH-550, 0.1 part of defoamer (organic silicon defoamer SD998), 0.5 part of thickener (SN-Thickener 636), 0.2 part of leveling agent BYK-337, 5 parts of deionized water, and 0.2 part of film-forming aid (propylene glycol); A method for preparing a wear-resistant floor heating floor comprises the following steps: Step S1, weighing raw materials by weight, adding deionized water, reinforcing filler prepared in Example 1, zinc oxide, silane coupling agent KH-550, defoamer (organic silicon defoamer SD998), thickener (SN-Thickener 636), leveling agent BYK-337 and film-forming aid (propylene glycol) to the modified polyurethane emulsion prepared in Example 1, stirring and dispersing, and obtaining a wear-resistant polyurethane coating; Step S2, uniformly apply the wear-resistant polyurethane coating on the surface of the rock wood board, the thickness of the first coating is 0.5 mm, the thickness of the second coating is 0.4 mm, and dry to obtain the wear-resistant floor heating floor. Example 5

[0019] A wear-resistant floor heating floor, comprising a base material layer and a wear-resistant layer, wherein the base material layer is a rock wood board, and the wear-resistant layer is obtained by uniformly coating a wear-resistant polyurethane coating on the surface of the rock wood board; The wear-resistant polyurethane coating comprises the following raw materials in parts by weight: 45 parts of the modified polyurethane emulsion prepared in Example 2, 7 parts of the reinforcing filler prepared in Example 2, 4 parts of zinc oxide, 2 parts of silane coupling agent KH-550, 0.3 parts of defoamer (organic silicon defoamer SD998), 0.7 parts of thickener (SN-Thickener 636), 0.4 parts of leveling agent BYK-337, 7 parts of deionized water, and 0.5 parts of film-forming aid (propylene glycol); A method for preparing a wear-resistant floor heating floor comprises the following steps: Step S1, weighing raw materials by weight, adding deionized water, reinforcing filler prepared in Example 2, zinc oxide, silane coupling agent KH-550, defoamer (organic silicon defoamer SD998), thickener (SN-Thickener 636), leveling agent BYK-337 and film-forming aid (propylene glycol) to the modified polyurethane emulsion prepared in Example 2, stirring and dispersing, and obtaining a wear-resistant polyurethane coating; Step S2, uniformly apply the wear-resistant polyurethane coating on the surface of the rock wood board, the thickness of the first coating is 0.6 mm, the thickness of the second coating is 0.5 mm, and dry to obtain the wear-resistant floor heating floor. Example 6

[0020] A wear-resistant floor heating floor, comprising a base material layer and a wear-resistant layer, wherein the base material layer is a rock wood board, and the wear-resistant layer is obtained by uniformly coating a wear-resistant polyurethane coating on the surface of the rock wood board; The wear-resistant polyurethane coating comprises the following raw materials in parts by weight: 50 parts of the modified polyurethane emulsion prepared in Example 3, 8 parts of the reinforcing filler prepared in Example 3, 5 parts of zinc oxide, 3 parts of silane coupling agent KH-550, 0.5 parts of defoaming agent (organic silicon defoaming agent SD998), 1 part of thickener (SN-Thickener 636), 0.6 parts of leveling agent BYK-337, 10 parts of deionized water, and 1 part of film-forming aid (propylene glycol); A method for preparing a wear-resistant floor heating floor comprises the following steps: Step S1, weighing raw materials by weight, adding deionized water, reinforcing filler prepared in Example 3, zinc oxide, silane coupling agent KH-550, defoamer (organic silicon defoamer SD998), thickener (SN-Thickener 636), leveling agent BYK-337 and film-forming aid (propylene glycol) to the modified polyurethane emulsion prepared in Example 3, stirring and dispersing, and obtaining a wear-resistant polyurethane coating; Step S2, evenly apply the wear-resistant polyurethane coating on the surface of the rock wood board, the thickness of the first coating is 0.8 mm, the thickness of the second coating is 0.6 mm, and dry to obtain the wear-resistant floor heating floor.

[0021] Comparative Example 1 This comparative example is a floor heating floor, which is different from Example 6 in that the modified polyurethane emulsion prepared in Example 3 is replaced by a commercially available polyurethane emulsion, and the rest is the same.

[0022] Comparative Example 2 This comparative example is a floor heating floor, which differs from Example 6 in that the reinforcing filler prepared in Example 3 is replaced with commercially available graphene nanosheets, and the rest is the same.

[0023] The polyurethane coatings on the surface of the floor heating floor prepared in Examples 4-6 and Comparative Examples 1-2 were subjected to performance tests: Abrasion resistance test: According to GB / T 1768-2006 Determination of abrasion resistance of paints and varnishes - Rotating rubber grinding wheel method; Flame retardancy test: tested using UL94 standard; Heat resistance test: Test the heat resistance weight loss rate of polyurethane coating at 212℃ and 239℃; Thermal conductivity test: According to ASTM E1530-2006 standard, the test is carried out using a steady-state thermal conductivity instrument; The test results are shown in the following table:

[0024] It can be seen from the above table that the floor heating floor of the present invention, after being coated with the wear-resistant polyurethane coating, has excellent flame retardancy, wear resistance, heat resistance and thermal conductivity, and can be widely used on the floor surface to improve the comprehensive performance of the floor.

[0025] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A wear-resistant floor heating floor, characterized in that: It comprises a base material layer and a wear-resistant layer, wherein the base material layer is a rock wood board, and the wear-resistant layer is obtained by uniformly coating a wear-resistant polyurethane coating on the surface of the rock wood board; The wear-resistant polyurethane coating comprises the following raw materials in parts by weight: 40-50 parts of modified polyurethane emulsion, 5-8 parts of reinforcing filler, 3-5 parts of zinc oxide, 1-3 parts of silane coupling agent, 0.1-0.5 parts of defoamer, 0.5-1 parts of thickener, 0.2-0.6 parts of leveling agent, 5-10 parts of deionized water, and 0.2-1 parts of film-forming aid; The modified polyurethane emulsion is prepared by the following steps: Step A1, dispersing 5-aminoisophthalic acid and triethylamine in dichloromethane, adding diphenyl chlorophosphate at 0-5°C, then heating to room temperature and stirring to react for 12-16h, filtering, washing and drying to obtain a carboxyl-terminated product; Step A2, 4,6-diaminoresorcinol hydrochloride, the carboxyl-terminated product and polyphosphoric acid are uniformly stirred, and the mixture is heated to 100-110° C. and stirred for reaction for 30-50 min, and then heated to 200-210° C. and reacted for 2-3 h, filtered, and the precipitate is collected and soaked in a 10 wt % sodium carbonate aqueous solution for 12 h, and then filtered, washed and dried to obtain a functionalized chain extender; Step A3, under nitrogen conditions, treating the polyester polyol at 120° C. for 3 hours, cooling to 90° C., adding isophorone diisocyanate and dibutyltin dilaurate, mixing and stirring for 30-40 minutes, and then adding a functional chain extender to continue reacting for 2.5-3.5 hours to obtain a polyurethane prepolymer; Step A4, dispersing hydroxy silicone oil in tetrahydrofuran, adding polyurethane prepolymer, reacting under nitrogen at 60° C. for 2.5-3.5 hours, distilling off tetrahydrofuran at 80-90° C., adding deionized water and stirring evenly, to obtain a modified polyurethane emulsion.

2. The wear-resistant floor heating floor according to claim 1, characterized in that: In step A1, the usage ratio of 5-aminoisophthalic acid, triethylamine, dichloromethane and diphenyl chlorophosphate is 0.051-0.153 mol: 0.05-0.15 mol: 200 mL: 0.05-0.15 mol.

3. The wear-resistant floor heating floor according to claim 1, characterized in that: In step A2, the usage ratio of 4,6-diaminoresorcinol hydrochloride, the carboxyl-terminated product, polyphosphoric acid and sodium carbonate aqueous solution is 0.02-0.06 mol: 0.01-0.03 mol: 16-50 g: 100 mL.

4. The wear-resistant floor heating floor according to claim 1, characterized in that: In step A3, the usage ratio of polyester polyol, isophorone diisocyanate, dibutyltin dilaurate and functional chain extender is 0.1 mol: 0.13-0.17 mol: 0.0005-0.001 mol: 0.01-0.03 mol.

5. The wear-resistant floor heating floor according to claim 1, characterized in that: In step A4, the usage ratio of hydroxy silicone oil, tetrahydrofuran, polyurethane prepolymer and deionized water is 1-3 g:50 mL:10-15 g:15-20 mL.

6. The wear-resistant floor heating floor according to claim 1, characterized in that: The reinforcing filler is prepared by the following steps: Step B1, dispersing thioacetamide and sodium molybdate evenly in deionized water, adding graphene nanosheets and stirring for 30 minutes, transferring to an autoclave, and reacting at 180-220° C. for 18-24 hours, cooling to room temperature, washing and drying to obtain a graphene / MoS2 composite material; Step B2, ultrasonically disperse the graphene / MoS2 composite material in deionized water for 30-50 minutes, add hexadecyltrimethylammonium bromide and stir for 10 minutes, and then ultrasonically disperse for 1-3 hours. After the reaction is completed, filter, wash and dry to obtain a reinforced filler.

7. The wear-resistant floor heating floor according to claim 6, characterized in that: In step B1, the usage ratio of thioacetamide, sodium molybdate, deionized water and graphene nanosheets is 0.3-0.9 g: 0.15-0.45 g: 100 mL: 0.05-0.15 g.

8. The wear-resistant floor heating floor according to claim 6, characterized in that: In step B2, the usage ratio of graphene / MoS2 composite material, deionized water and hexadecyltrimethylammonium bromide is 2g:50mL:0.1-0.5g.

9. The method for preparing a wear-resistant floor heating floor according to claim 1, characterized in that: The following steps are involved: Step S1, weighing raw materials by weight, adding deionized water, reinforcing filler, zinc oxide, silane coupling agent, defoamer, thickener, leveling agent and film-forming aid to the modified polyurethane emulsion, stirring and dispersing, and obtaining a wear-resistant polyurethane coating; Step S2, evenly apply the wear-resistant polyurethane coating on the surface of the rock wood board, the thickness of the first coating is 0.5-0.8mm, the thickness of the second coating is 0.4-0.6mm, and dry to obtain the wear-resistant floor heating floor.

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