Impact-resistant environment-friendly acrylic acid modified polyurethane floor coating and preparation method thereof

Abstract

The invention relates to the technical field of polyurethane floor coatings, in particular to an impact-resistant environment-friendly acrylic acid modified polyurethane floor coating and a preparation method thereof. The impact-resistant environment-friendly acrylic acid modified polyurethane floor coating comprises the following raw materials: a component A and a component B, and the mass ratio of the component A to the component B is 1: (5-15), the component A comprises a water-based aliphatic isocyanate prepolymer; the component B is prepared from the following components in parts by mass: 40 to 60 parts of hydroxyl acrylic emulsion, 1 to 5 parts of polycaprolactone polyol, 1 to 3 parts of impact modifier, 2 to 6 parts of pigment, 10 to 30 parts of filler, 1 to 2 parts of nonionic wetting agent, 1 to 2 parts of polyether defoaming agent, 1 to 2 parts of preservative, 1 to 2 parts of polyurethane thickening agent and 10 to 15 parts of water. The components of the component A and the component B are matched with each other to generate a synergistic effect, so that an obtained coating film has relatively good hardness and adhesive force and is excellent in impact resistance and wear resistance.

Description

Technical Field

[0001] This invention relates to the field of polyurethane floor coating technology, and in particular to an impact-resistant, environmentally friendly acrylic-modified polyurethane floor coating and its preparation method. Background Art

[0002] With the increasing demands for functionality in flooring materials from modern industrial plants, logistics warehouses, and public facilities, floor coatings are rapidly developing towards environmental friendliness and high performance. Epoxy floor coatings occupy an important position due to their excellent decorative properties and chemical resistance, but their inherent defects of high brittleness and poor impact resistance make them prone to cracking under dynamic loads.

[0003] Existing solvent-based polyurethane floor coatings still face significant application bottlenecks. The continuous release of VOCs during production and construction not only exacerbates petroleum resource depletion but also poses flammable and explosive risks at construction sites. While existing environmentally friendly waterborne polyurethane floor coatings reduce VOC content, their technical shortcomings are equally prominent. Simply relying on water-based formulations cannot solve the problem of insufficient film density leading to decreased wear resistance. Furthermore, waterborne polyurethane floor coatings exhibit significant limitations when dealing with complex working conditions. Waterborne systems generally suffer from long film-forming times and difficulties in low-temperature curing, resulting in insufficient interfacial adhesion between the coating and the cementitious substrate, causing peeling and detachment during long-term use.

[0004] To address the aforementioned technical issues, there is an urgent need to develop new floor coatings that combine environmental friendliness with excellent mechanical properties. Acrylic-modified polyurethane floor coatings have become a research hotspot due to the designability of their molecular chain segments. However, existing technologies suffer from defects such as imperfect crosslinking network construction and poor filler dispersion stability, making it difficult to achieve breakthroughs in the overall performance of the coating film. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an impact-resistant, environmentally friendly acrylic-modified polyurethane floor coating and its preparation method.

[0006] An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, comprising the following raw materials: Component A and Component B, with a mass ratio of Component A to Component B of 1:5-15; Component A includes: waterborne aliphatic isocyanate prepolymer; Component B, by mass, includes: 40-60 parts of hydroxyl acrylic emulsion, 1-5 parts of polycaprolactone polyol, 1-3 parts of impact modifier, 2-6 parts of pigment, 10-30 parts of filler, 1-2 parts of nonionic wetting agent, 1-2 parts of polyether defoamer, 1-2 parts of preservative, 1-2 parts of polyurethane thickener, and 10-15 parts of water.

[0007] Preferably, the filler is ultrafine mica powder and / or ultrafine quartz powder.

[0008] More preferably, the fineness of the ultrafine mica powder is 1250 mesh.

[0009] More preferably, the fineness of the ultrafine quartz powder is 800-1000 mesh.

[0010] Preferably, the pigment is at least one of iron oxide green, iron oxide yellow, iron oxide red, iron oxide black, phthalocyanine blue, phthalocyanine green, and rutile titanium dioxide.

[0011] Preferably, the impact modifier is prepared by the following steps: graphene oxide and coupling agent are added to an ethanol aqueous solution and stirred for 10-20 minutes at a stirring temperature of 70-80°C. Under nitrogen protection, terminal amino-terminated polyamide amine dendritic polymer is added and stirred at 70-80°C for 2-6 hours. Triethylamine and butanediol diglycidyl ether are added and stirred for 1-2 hours. The mixture is then cooled to room temperature, and the pH of the system is adjusted to 7-8. The mixture is then filtered, washed, vacuum dried, and pulverized.

[0012] The impact modifier obtained in this invention is rich in hydroxyl groups and has dispersibility. This invention introduces epoxy groups onto graphene oxide, and then reacts with an amino-terminated polyamide amine dendrimer to construct a three-dimensional network structure. This not only prevents the graphene oxide sheets from re-stacking, but also, under triethylamine catalysis, combines with butanediol diglycidyl ether, effectively increasing the flexibility of the molecular chain and the density of hydroxyl groups, thus effectively enhancing the reactivity with isocyanates.

[0013] More preferably, the mass ratio of graphene oxide, coupling agent, amino-terminated polyamide amine dendritic polymer, triethylamine, and butanediol diglycidyl ether is 5-10:0.1-1:1-2:0.5-1:1-2.

[0014] More preferably, the coupling agent is silane coupling agent KH560.

[0015] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and nonionic wetting agent to water and stirring evenly; adding pigments and fillers while stirring, stirring for 10-20 minutes, and grinding to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone polyol, polyether defoamer, preservative, and polyurethane thickener to the premix and stirring evenly, and filtering to obtain component B; mixing component A and component B evenly.

[0016] Preferably, the material is ground to a density of D90 ≤ 30 μm.

[0017] Beneficial effects:

[0018] This invention utilizes the dendritic structure of PAMAM in the impact modifier to prevent the re-stacking of graphene oxide sheets through physical entanglement and chemical bonding. Furthermore, the introduction of butanediol diglycidyl ether increases the flexibility of the molecular chain and the density of hydroxyl groups, effectively enhancing the reactivity with isocyanates, shortening the film-forming time, and simultaneously increasing the crosslinking density, thus significantly improving the impact strength and abrasion resistance of the coating.

[0019] This invention uses a compound of hydroxy acrylic emulsion, polycaprolactone polyol, and impact modifier. The hydroxy acrylic emulsion can undergo a condensation reaction with the silanol groups in the cement substrate, while the flexible segments of polycaprolactone can fill the capillary pores through physical penetration. The hydroxy acrylic emulsion, polycaprolactone polyol, impact modifier, and isocyanate are cured together. The dual crosslinking mechanism ensures strong adhesion to the substrate, gives the coating film better density, and effectively balances the hardness and impact resistance of the coating film. The coating film has excellent overall performance.

[0020] Meanwhile, the graphene oxide sheet structure in the impact modifier obtained by this invention, together with the dendritic structure grafted on it, provides steric hindrance, which can effectively prevent the agglomeration of pigments and fillers, effectively improve the compatibility with hydroxyl acrylic emulsion, reduce stratification and precipitation, and improve the storage stability of the coating.

[0021] This invention utilizes the synergistic effect of the components A and B to produce a coating film with good hardness and adhesion, as well as excellent impact resistance and abrasion resistance. The coating uses water as the dispersion medium and has extremely low VOC content, which not only saves a significant amount of petroleum resources and eliminates fire hazards during production, storage, transportation, and construction, but also helps protect the environment and the health of construction workers. Attached Figure Description

[0022] Figure 1 This is a comparison chart of the impact resistance and abrasion resistance of the floor coatings obtained in Example 5 and Comparative Examples 1-2.

[0023] Figure 2 The diagram shows a comparison of the anti-slip properties and tensile bond strength of the floor coatings obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0024] The present invention will be further explained below with reference to specific embodiments.

[0025] The following water-based aliphatic isocyanate prepolymers were purchased from Guangzhou Mouyi New Material Technology Co., Ltd., model WH-2098. The following hydroxyl acrylic emulsions were purchased from Jining Mouyu Chemical Co., Ltd., model CX-822, with a solid content (by mass) of 45±2% and a hydroxyl content (by solid content) of 3.2%. The following polycaprolactone triol (CAS: 37625-56-2) was purchased from Hubei Mouyan Ligao Biomedical Co., Ltd. The following iron oxide green was purchased from Lingshou County Moufeng Mineral Products Processing Plant. The following wetting agent X-405 was sourced from Dow Chemical, USA, model DOWFAX X-405. The following polyether defoamer was sourced from Evonik, model TEGO FOAMEX 825. The following polyurethane thickener was purchased from Shanghai Mouyan New Material Co., Ltd., model HY-2020. The following EPW preservative was purchased from Shandong Mousong New Material Co., Ltd.

[0026] Example 1: An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, the raw materials of which include: component A and component B, with the mass ratio of component A to component B being 1:5.

[0027] Component A includes: aqueous aliphatic isocyanate prepolymer; Component B includes: 400g hydroxyl acrylic emulsion, 10g polycaprolactone triol, 10g impact modifier, 20g iron oxide green, 100g ultrafine mica powder with a fineness of 1250 mesh, 10g wetting agent X-405, 10g polyether defoamer, 10g EPW preservative, 10g polyurethane thickener, and 100g deionized water.

[0028] The impact modifier is prepared by the following steps: 50g of graphene oxide and 1g of silane coupling agent KH560 are added to 400g of 40% ethanol aqueous solution, stirred at 500r / min for 10min at a stirring temperature of 70℃, 10g of amino-terminated polyamide amine dendritic polymer is added under nitrogen protection, stirred at 70℃ for 2h, 5g of triethylamine and 10g of butanediol diglycidyl ether are added, stirred for 1h, cooled to room temperature, the pH of the system is adjusted to 7-8, filtered, washed, vacuum dried, and pulverized.

[0029] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and wetting agent X-405 to deionized water and stirring evenly; adding iron oxide green and ultrafine mica powder while stirring; stirring at 1000 r / min for 10 min; grinding until D90≤30μm to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative, and polyurethane thickener to the premix and stirring evenly; filtering with a 120-mesh filter cloth to obtain component B; and mixing component A and component B evenly.

[0030] Example 2: An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, the raw materials of which include: component A and component B, with the mass ratio of component A to component B being 1:15.

[0031] Component A includes: aqueous aliphatic isocyanate prepolymer; Component B includes: 600g hydroxyl acrylic emulsion, 50g polycaprolactone triol, 30g impact modifier, 60g iron oxide green, 300g ultrafine quartz powder with a fineness of 1000 mesh, 20g wetting agent X-405, 20g polyether defoamer, 20g EPW preservative, 20g polyurethane thickener, and 150g deionized water.

[0032] The impact modifier is prepared by the following steps: 100g of graphene oxide and 10g of silane coupling agent KH560 are added to 600g of 60% ethanol aqueous solution, stirred at 1000r / min for 20min at a stirring temperature of 80℃, 20g of amino-terminated polyamide amine dendritic polymer is added under nitrogen protection, stirred at 80℃ for 6h, 10g of triethylamine and 20g of butanediol diglycidyl ether are added, stirred for 2h, cooled to room temperature, the pH of the system is adjusted to 7-8, filtered, washed, vacuum dried, and pulverized.

[0033] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and wetting agent X-405 to deionized water and stirring evenly; adding iron oxide green and ultrafine quartz powder while stirring; stirring at 2000 r / min for 20 min; grinding until D90≤30μm to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative, and polyurethane thickener to the premix and stirring evenly; filtering with a 120-mesh filter cloth to obtain component B; and mixing component A and component B evenly.

[0034] Example 3: An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, the raw materials of which include: component A and component B, with the mass ratio of component A to component B being 1:8.

[0035] Component A includes: aqueous aliphatic isocyanate prepolymer; Component B includes: 550g hydroxyl acrylic emulsion, 20g polycaprolactone triol, 25g impact modifier, 30g iron oxide green, 150g ultrafine mica powder with a fineness of 1250 mesh, 100g ultrafine quartz powder with a fineness of 800 mesh, 13g wetting agent X-405, 17g polyether defoamer, 12g EPW preservative, 18g polyurethane thickener, and 110g deionized water.

[0036] The impact modifier was prepared using the following steps: 90g of graphene oxide and 3g of silane coupling agent KH560 were added to 550g of 45% ethanol aqueous solution. The mixture was stirred at 900r / min for 12min at a stirring temperature of 77℃. Under nitrogen protection, 12g of amino-terminated polyamide amine dendritic polymer was added and stirred at 77℃ for 3h. Then, 9g of triethylamine and 12g of butanediol diglycidyl ether were added and stirred for 100min. The mixture was cooled to room temperature, and the pH of the system was adjusted to 7-8. The mixture was then filtered, washed, vacuum dried, and pulverized.

[0037] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and wetting agent X-405 to deionized water and stirring evenly; adding iron oxide green, ultrafine mica powder and ultrafine quartz powder while stirring; stirring at 1200 r / min for 17 min; grinding until D90≤30μm to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative and polyurethane thickener to the premix and stirring evenly; filtering with a 120-mesh filter cloth to obtain component B; mixing component A and component B evenly.

[0038] Example 4: An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, the raw materials of which include: component A and component B, with the mass ratio of component A to component B being 1:12.

[0039] Component A includes: aqueous aliphatic isocyanate prepolymer; Component B includes: 450g hydroxyl acrylic emulsion, 40g polycaprolactone triol, 15g impact modifier, 50g iron oxide green, 100g ultrafine mica powder with a fineness of 1250 mesh, 50g ultrafine quartz powder with a fineness of 1000 mesh, 17g wetting agent X-405, 13g polyether defoamer, 18g EPW preservative, 12g polyurethane thickener, and 130g deionized water.

[0040] The impact modifier was prepared using the following steps: 70g of graphene oxide and 7g of silane coupling agent KH560 were added to 450g of a 55% ethanol aqueous solution. The mixture was stirred at 700r / min for 18min at a stirring temperature of 73℃. Under nitrogen protection, 18g of amino-terminated polyamide amine dendritic polymer was added and stirred at 73℃ for 5h. Then, 7g of triethylamine and 18g of butanediol diglycidyl ether were added and stirred for 80min. The mixture was cooled to room temperature, and the pH of the system was adjusted to 7-8. The mixture was then filtered, washed, vacuum dried, and pulverized.

[0041] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and wetting agent X-405 to deionized water and stirring evenly; adding iron oxide green, ultrafine mica powder and ultrafine quartz powder while stirring; stirring at 1800 r / min for 13 min; grinding until D90≤30μm to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative and polyurethane thickener to the premix and stirring evenly; filtering with a 120-mesh filter cloth to obtain component B; mixing component A and component B evenly.

[0042] Example 5: An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, the raw materials of which include: component A and component B, with the mass ratio of component A to component B being 1:10.

[0043] Component A includes: aqueous aliphatic isocyanate prepolymer; Component B includes: 500g hydroxyl acrylic emulsion, 30g polycaprolactone triol, 20g impact modifier, 40g iron oxide green, 100g ultrafine mica powder (1250 mesh), 100g ultrafine quartz powder (1000 mesh), 15g wetting agent X-405, 15g polyether defoamer, 15g EPW preservative, 15g polyurethane thickener, and 120g deionized water.

[0044] The impact modifier was prepared using the following steps: 80g of graphene oxide and 5g of silane coupling agent KH560 were added to 500g of 50% ethanol aqueous solution. The mixture was stirred at 800r / min for 15min at a stirring temperature of 75℃. Under nitrogen protection, 15g of amino-terminated polyamide amine dendritic polymer was added and stirred at 75℃ for 4h. Then, 8g of triethylamine and 15g of butanediol diglycidyl ether were added and stirred for 90min. The mixture was cooled to room temperature, and the pH of the system was adjusted to 7-8. The mixture was then filtered, washed, vacuum dried, and pulverized.

[0045] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and wetting agent X-405 to deionized water and stirring evenly; adding iron oxide green, ultrafine mica powder and ultrafine quartz powder while stirring; stirring at 1500 r / min for 15 min; grinding until D90≤30μm to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative and polyurethane thickener to the premix and stirring evenly; filtering with a 120-mesh filter cloth to obtain component B; mixing component A and component B evenly.

[0046] Comparative Example 1: An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, the raw materials of which include: component A and component B, with the mass ratio of component A to component B being 1:10.

[0047] Component A includes: aqueous aliphatic isocyanate prepolymer; Component B includes: 500g hydroxyl acrylic emulsion, 30g polycaprolactone triol, 20g impact modifier, 40g iron oxide green, 100g ultrafine mica powder (1250 mesh), 100g ultrafine quartz powder (1000 mesh), 15g wetting agent X-405, 15g polyether defoamer, 15g EPW preservative, 15g polyurethane thickener, and 120g deionized water.

[0048] The impact modifier is prepared by the following steps: 80g of graphene oxide and 5g of silane coupling agent KH560 are added to 500g of 50% ethanol aqueous solution, stirred at 800r / min for 15min at a stirring temperature of 75℃, and 15g of amino-terminated polyamide amine dendritic polymer is added under nitrogen protection. The mixture is stirred at 75℃ for 4h, filtered, washed, vacuum dried, and pulverized.

[0049] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and wetting agent X-405 to deionized water and stirring evenly; adding iron oxide green, ultrafine mica powder and ultrafine quartz powder while stirring; stirring at 1500 r / min for 15 min; grinding until D90≤30μm to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative and polyurethane thickener to the premix and stirring evenly; filtering with a 120-mesh filter cloth to obtain component B; mixing component A and component B evenly.

[0050] Comparative Example 2: An impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating, the raw materials of which include: component A and component B, with the mass ratio of component A to component B being 1:10.

[0051] Component A includes: aqueous aliphatic isocyanate prepolymer; Component B includes: 500g hydroxyl acrylic emulsion, 20g impact modifier, 40g iron oxide green, 100g ultrafine mica powder with a fineness of 1250 mesh, 100g ultrafine quartz powder with a fineness of 1000 mesh, 15g wetting agent X-405, 15g polyether defoamer, 15g EPW preservative, 15g polyurethane thickener, and 120g deionized water.

[0052] The impact modifier was prepared using the following steps: 80g of graphene oxide and 5g of silane coupling agent KH560 were added to 500g of 50% ethanol aqueous solution. The mixture was stirred at 800r / min for 15min at a stirring temperature of 75℃. Under nitrogen protection, 15g of amino-terminated polyamide amine dendritic polymer was added and stirred at 75℃ for 4h. Then, 8g of triethylamine and 15g of butanediol diglycidyl ether were added and stirred for 90min. The mixture was cooled to room temperature, and the pH of the system was adjusted to 7-8. The mixture was then filtered, washed, vacuum dried, and pulverized.

[0053] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: adding the impact modifier and wetting agent X-405 to deionized water and stirring evenly; adding iron oxide green, ultrafine mica powder and ultrafine quartz powder while stirring; stirring at 1500 r / min for 15 min; grinding until D90≤30μm to obtain a premix; adding hydroxyl acrylic emulsion, polyether defoamer, EPW preservative and polyurethane thickener to the premix and stirring evenly; filtering with a 120-mesh filter cloth to obtain component B; mixing component A and component B evenly.

[0054] The pencil hardness and adhesion of the floor coatings obtained in Example 5 and Comparative Examples 1-2 were measured in accordance with the requirements for water-based floor coating materials in GB / T 22374-2018 "Floor Coating Materials". The results are shown in Table 1.

[0055] Table 1. Performance test results of each group of floor coatings Example 5 Comparative Example 1 Comparative Example 2 Pencil hardness 3H H 2H Adhesion Level 0 Level 1 Level 2 Referring to the requirements for water-based floor coating materials in GB / T 22374-2018 "Floor Coating Materials", the impact resistance (using a 1000g steel ball; since none of the three coatings showed cracks or peeling at a height of 100cm, the height was increased until cracks or peeling occurred), abrasion resistance (CS-17, 750g / 500r), anti-slip properties, and tensile bond strength of the floor coatings obtained in Example 5 and Comparative Examples 1-2 were measured.

[0056] like Figure 1 As shown, the floor coating obtained in Example 5 exhibits the highest impact resistance and the lowest wear mass, superior to Comparative Examples 1-2 (P < 0.05). Figure 2 As shown, the floor coating obtained in Example 5 has the highest anti-slip properties and tensile bond strength, which are superior to those of Comparative Examples 1-2 (P<0.05).

[0057] The reason for the above results is that this invention utilizes the dendritic structure of PAMAM in the impact modifier to prevent the recombination of graphene oxide sheets through physical entanglement and chemical bonding. Furthermore, the introduction of butanediol diglycidyl ether increases the flexibility of the molecular chain and the density of hydroxyl groups, effectively enhancing the reactivity with isocyanate, shortening film formation time, and simultaneously increasing crosslinking density, significantly improving the impact strength and abrasion resistance of the coating. This invention uses a compound of hydroxyl acrylic emulsion, polycaprolactone polyol, and the impact modifier. The hydroxyl acrylic emulsion can undergo a condensation reaction with the silanol groups in the cementitious substrate, while the flexible segments of polycaprolactone can physically penetrate and fill capillary pores. The hydroxyl acrylic emulsion, polycaprolactone polyol, impact modifier, and isocyanate are cured. This dual crosslinking mechanism ensures strong adhesion to the substrate, improves the density of the coating film, and effectively balances the hardness and impact resistance of the coating film, resulting in excellent overall coating performance.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An impact-resistant, environmentally friendly acrylic-modified polyurethane floor coating, characterized in that, Its raw materials include: component A and component B, with the mass ratio of component A to component B being 1:5-15; Component A includes: aqueous aliphatic isocyanate prepolymer; Component B, by weight, comprises: 40-60 parts hydroxyl acrylic emulsion, 1-5 parts polycaprolactone polyol, 1-3 parts impact modifier, 2-6 parts pigment, 10-30 parts filler, 1-2 parts nonionic wetting agent, 1-2 parts polyether defoamer, 1-2 parts preservative, 1-2 parts polyurethane thickener, and 10-15 parts water.

2. The impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating according to claim 1, characterized in that, The filler is ultrafine mica powder and / or ultrafine quartz powder.

3. The impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating according to claim 2, characterized in that, The fineness of the ultrafine mica powder is 1250 mesh.

4. The impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating according to claim 2, characterized in that, The fineness of ultrafine quartz powder is 800-1000 mesh.

5. The impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating according to claim 1, characterized in that, The pigment is at least one of iron oxide green, iron oxide yellow, iron oxide red, iron oxide black, phthalocyanine blue, phthalocyanine green, and rutile titanium dioxide.

6. The impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating according to claim 1, characterized in that, The impact modifier is prepared by the following steps: graphene oxide and coupling agent are added to an ethanol aqueous solution and stirred for 10-20 minutes at a stirring temperature of 70-80℃. Under nitrogen protection, terminal amino-terminated polyamide amine dendritic polymer is added and stirred at 70-80℃ for 2-6 hours. Triethylamine and butanediol diglycidyl ether are added and stirred for 1-2 hours. The mixture is then cooled to room temperature, and the pH of the system is adjusted to 7-8. The mixture is then filtered, washed, vacuum dried, and pulverized.

7. The impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating according to claim 6, characterized in that, The mass ratio of graphene oxide, coupling agent, amino-terminated polyamide amine dendritic polymer, triethylamine, and butanediol diglycidyl ether is 5-10. 0.1-1：1-2：0.5-1：1-2。 8. The impact-resistant and environmentally friendly acrylic-modified polyurethane floor coating according to claim 6, characterized in that, The coupling agent is silane coupling agent KH560.

9. A method for preparing an impact-resistant, environmentally friendly acrylic-modified polyurethane floor coating as described in any one of claims 1-8, characterized in that, The process includes the following steps: adding the impact modifier and nonionic wetting agent to water and stirring until homogeneous; adding pigments and fillers while stirring, stirring for 10-20 minutes, and grinding to obtain a premix; adding hydroxyl acrylic emulsion, polycaprolactone polyol, polyether defoamer, preservative, and polyurethane thickener to the premix and stirring until homogeneous; filtering to obtain component B; and mixing components A and B until homogeneous.

10. The preparation method of the impact-resistant environmentally friendly acrylic-modified polyurethane floor coating according to claim 9, characterized in that, Grind until D90≤30μm.

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