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

Abstract

The present application relates to polyurethane floor paint technical field, especially to a kind of impact-resistant environment-friendly acrylic modified polyurethane floor paint and preparation method thereof.The above-mentioned impact-resistant environment-friendly acrylic modified polyurethane floor paint, its raw material includes:A component, B component, A component and B component mass ratio is 1:5-15;A component includes:water-based aliphatic isocyanate prepolymer;B component includes by mass fraction:hydroxyl acrylic acid emulsion 40-60 parts, polycaprolactone polyol 1-5 parts, impact modifier 1-3 parts, pigment 2-6 parts, filler 10-30 parts, non-ionic wetting agent 1-2 parts, polyether defoaming agent 1-2 parts, preservative 1-2 parts, polyurethane thickening agent 1-2 parts, water 10-15 parts.The present application utilizes each component of A component and B component to match each other, produces synergistic effect, so that the obtained coating film has good hardness and adhesion, and impact resistance, wear resistance is excellent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyurethane floor coatings, and particularly relates to an impact-resistant environment-friendly acrylic modified polyurethane floor coating and a preparation method thereof. BACKGROUND

[0002] With the increasing functional requirements of modern industrial plants, logistics warehouses and public facilities on floor materials, floor coatings are rapidly developing towards environmental protection and high performance. Epoxy floor coatings occupy an important position due to their excellent decorative properties and chemical resistance, but their inherent defects of brittleness and poor impact resistance lead to cracking problems in dynamic load environments.

[0003] Existing solvent-based polyurethane floor coatings still have significant application bottlenecks. They continuously release VOCs during production and construction, which not only exacerbates the consumption of petroleum resources, but also causes flammable and explosive risks at the construction site. Although existing environmentally friendly water-based polyurethane floor coatings reduce the VOC content, their technical defects are also prominent. Simply relying on water-based technology cannot solve the problem of decreased wear resistance caused by insufficient film density. In addition, water-based polyurethane floor coatings have obvious limitations when dealing with complex working conditions. The water-based system generally has problems such as long film formation time and difficulty in low-temperature curing, which leads to insufficient interfacial adhesion between the coating film and the cement substrate, resulting in peeling and falling off during long-term use.

[0004] In view of the above technical problems, there is an urgent need to develop a new type of floor coating that combines environmental protection and excellent mechanical properties. Acrylic modified polyurethane floor coatings have become a research hotspot due to their designability of molecular chain segments. However, existing technologies have defects such as imperfect cross-linking network construction and poor filler dispersion stability, which make it difficult to break through the comprehensive performance of the coating film. SUMMARY

[0005] The present application aims to solve the problems in the prior art and provides an impact-resistant environment-friendly acrylic modified polyurethane floor coating and a preparation method thereof.

[0006] An impact-resistant environment-friendly acrylic modified polyurethane floor coating, which comprises: A component and B component, and the mass ratio of the A component to the B component is 1:5-15; the A component comprises: a water-based aliphatic isocyanate prepolymer; the B component comprises, by mass fraction: 40-60 parts of a hydroxyl acrylic acid emulsion, 1-5 parts of a polycaprolactone polyol, 1-3 parts of an impact modifier, 2-6 parts of pigments, 10-30 parts of fillers, 1-2 parts of a non-ionic wetting agent, 1-2 parts of a polyether defoamer, 1-2 parts of a preservative, 1-2 parts of a polyurethane thickening agent, and 10-15 parts of water.

[0007] Preferably, the fillers are superfine mica powder or / and superfine quartz powder.

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

[0009] More preferably, the fineness of the superfine 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 white powder.

[0011] Preferably, the impact resistance modifier is prepared by the following steps: graphene oxide and a coupling agent are added to an aqueous ethanol solution and stirred for 10-20 min at a stirring temperature of 70-80℃, an amino-terminated polyamide-amine dendrimer is added under nitrogen protection, stirring is performed at 70-80℃ for 2-6h, triethylamine and butanediol diglycidyl ether are added and stirred for 1-2h, the temperature is lowered to room temperature, the pH value of the system is adjusted to 7-8, filtration, washing, and vacuum drying, and crushing are performed.

[0012] The impact resistance modifier obtained by the method is rich in hydroxyl groups and has dispersibility. In the method, an epoxy group is introduced onto graphene oxide, and then a three-dimensional network structure is formed by reaction with an amino-terminated polyamide-amine dendrimer. The three-dimensional network structure not only prevents the graphene oxide layers from re-stacking, but also, under the catalysis of triethylamine, combines with butanediol diglycidyl ether, effectively increasing the flexibility of the molecular chain and the density of the hydroxyl groups, and effectively improving the reactivity with isocyanate.

[0013] More preferably, the mass ratio of graphene oxide, coupling agent, amino-terminated polyamide-amine dendrimer, 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 impact-resistant environment-friendly acrylic modified polyurethane floor coating comprises the following steps: the impact resistance modifier and the non-ionic wetting agent are added to water and stirred uniformly, the pigment and the filler are added under stirring, and stirring is performed for 10-20 min to obtain a premix; the hydroxyl acrylic emulsion, the polycaprolactone polyol, the polyether defoaming agent, the preservative, and the polyurethane thickening agent are added to the premix and stirred uniformly, and filtration is performed to obtain component B; and component A and component B are mixed uniformly.

[0016] Preferably, the grinding is performed to D90≤30μm.

[0017] Beneficial effects:

[0018] The dendritic structure of PAMAM in the impact modifier is used to prevent the re-stacking of graphene oxide sheets by physical entanglement and chemical bonding, and butanediol diglycidyl ether is introduced to increase the flexibility of the molecular chain and the density of hydroxyl groups, effectively improve the reactivity with isocyanate, shorten the film forming time, and at the same time, improve the crosslinking density, and significantly improve the impact strength and wear resistance of the coating.

[0019] The hydroxyl acrylic emulsion can react with the silicon hydroxyl groups in the cement base material, and the flexible chain segment of polycaprolactone can fill the capillary pores by physical penetration, and the hydroxyl acrylic emulsion, polycaprolactone polyol, impact modifier and isocyanate are cured, and the double crosslinking mechanism not only ensures strong adhesion to the base material, but also makes the coating film have better compactness, and can effectively balance the hardness and impact resistance of the coating film, and the comprehensive performance of the coating film is excellent.

[0020] Meanwhile, the space steric hindrance provided by the graphene oxide sheet structure in the impact modifier obtained by the application and the dendritic structure grafted thereon can effectively prevent the agglomeration of pigments and fillers, effectively improve the compatibility with the hydroxyl acrylic emulsion, reduce delamination and precipitation, and improve the storage stability of the coating.

[0021] The application of the application utilizes the mutual matching of each component of component A and component B to produce a synergistic effect, so that the obtained coating film has good hardness and adhesion, and excellent impact resistance and wear resistance. The coating of the application uses water as the dispersion medium, and the VOC content of the coating is extremely low, which not only saves a large amount of petroleum resources, eliminates the fire hazards during production, storage, transportation and construction, but also is beneficial to the protection of the environment and the health of the construction personnel. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The impact resistance and wear resistance comparison chart of the floor coating obtained in Example 5 and Comparative Examples 1-2.

[0023] Figure 2 The slip resistance and tensile bond strength comparison chart of the floor coating obtained in Example 5 and Comparative Examples 1-2. DETAILED DESCRIPTION

[0024] The application will be further described below in combination with specific examples.

[0025] The water-based aliphatic isocyanate prepolymer used below was purchased from Guangzhou Yixin New Material Technology Co., Ltd., model WH-2098. The hydroxyl acrylic emulsion used below was purchased from Jining Hehua Chemical Co., Ltd., model CX-822, solid content (by mass) 45±2%, hydroxyl content (by solid content) 3.2%. The polycaprolactone triol (CAS: 37625-56-2) used below was purchased from Hubei Yanli Gao Biomedical Co., Ltd. The green iron oxide used below was purchased from Lingshou County Feng Mine Product Processing Factory. The wetting agent X-405 used below was from Dow, model DOWFAX X-405. The polyether defoamer used below was from Winhov, model TEGO FOAMEX 825. The polyurethane thickening agent used below was purchased from Shanghai Xinyan New Material Co., Ltd., model HY-2020. The EPW preservative used below was purchased from Shandong Songxin New Material Co., Ltd.

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

[0027] Component A includes: water-based aliphatic isocyanate prepolymer; component B includes: 400g of hydroxyl acrylic emulsion, 10g of polycaprolactone triol, 10g of impact modifier, 20g of green iron oxide, 100g of superfine mica powder with fineness of 1250 mesh, 10g of wetting agent X-405, 10g of polyether defoamer, 10g of EPW preservative, 10g of polyurethane thickening agent, and 100g of 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% mass fraction ethanol aqueous solution, stirred at a speed of 500r / min for 10min, the stirring temperature is 70℃, 10g of amino-terminated polyamidoamine dendrimer is added under nitrogen protection, stirred at a temperature of 70℃ for 2h, 5g of triethylamine and 10g of butanediol diglycidyl ether are added, stirred for 1h, cooled to room temperature, the pH value of the system is adjusted to 7-8, filtered, washed, vacuum dried, and crushed.

[0029] The preparation method of the above-mentioned impact-resistant environmentally friendly acrylic modified polyurethane floor coating includes the following steps: the impact modifier and wetting agent X-405 are added to deionized water and stirred uniformly, the green iron oxide and superfine mica powder are added under stirring, stirred at a speed of 1000r / min for 10min, ground to D90≤30μm to obtain a premix; the hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative, and polyurethane thickening agent are added to the premix and stirred uniformly, filtered with 120 mesh filter cloth to obtain component B; component A and component B are mixed uniformly.

[0030] Embodiment 2, an impact-resistant environment-friendly acrylic modified polyurethane floor coating, raw materials of which include: A component, B component, and the mass ratio of the A component to the B component is 1:15.

[0031] The A component includes: a water-based aliphatic isocyanate prepolymer; the B component includes: a hydroxyl acrylic emulsion 600 g, a polycaprolactone triol 50 g, an impact-resistant modifier 30 g, iron oxide green 60 g, super-fine quartz powder with fineness of 1000 mesh 300 g, wetting agent X-405 20 g, polyether defoaming agent 20 g, EPW preservative 20 g, polyurethane thickening agent 20 g, and deionized water 150 g.

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

[0033] The preparation method of the impact-resistant environment-friendly acrylic modified polyurethane floor coating includes the following steps: the impact-resistant modifier and wetting agent X-405 are added to deionized water and stirred uniformly, the iron oxide green and super-fine quartz powder are added under stirring, stirred at a speed of 2000 r / min for 20 min, ground to D90≤30 μm to obtain a premix; the hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoaming agent, EPW preservative, and polyurethane thickening agent are added to the premix and stirred uniformly, filtered with a filter cloth with a mesh size of 120 to obtain the B component; and the A component and the B component are mixed uniformly.

[0034] Embodiment 3, an impact-resistant environment-friendly acrylic modified polyurethane floor coating, raw materials of which include: A component, B component, and the mass ratio of the A component to the B component is 1:8.

[0035] The A component includes: a water-based aliphatic isocyanate prepolymer; the B component includes: a hydroxyl acrylic emulsion 550 g, a polycaprolactone triol 20 g, an impact-resistant modifier 25 g, iron oxide green 30 g, super-fine mica powder with fineness of 1250 mesh 150 g, super-fine quartz powder with fineness of 800 mesh 100 g, wetting agent X-405 13 g, polyether defoaming agent 17 g, EPW preservative 12 g, polyurethane thickening agent 18 g, and deionized water 110 g.

[0036] The impact-resistant modifier is prepared by the following steps: 90g of graphene oxide, 3g of silane coupling agent KH560 are added to 550g of 45% mass fraction ethanol aqueous solution, stirred at a speed of 900r / min for 12min, the stirring temperature is 77℃, 12g of amino-terminated polyamidoamine dendrimer is added under nitrogen protection, stirred at a temperature of 77℃ for 3h, 9g of triethylamine and 12g of butanediol diglycidyl ether are added, stirred for 100min, and then the system is cooled to room temperature, the pH value of the system is adjusted to 7-8, filtered, washed, vacuum dried, and crushed.

[0037] The preparation method of the impact-resistant environment-friendly acrylic modified polyurethane floor paint comprises the following steps: the impact-resistant modifier and wetting agent X-405 are uniformly stirred in deionized water, and then iron oxide green, superfine mica powder and superfine quartz powder are added under stirring, and the mixture is stirred at a speed of 1200r / min for 17min, and then ground to D90≤30μm to obtain a premix; the hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoaming agent, EPW preservative and polyurethane thickening agent are uniformly stirred in the premix, and then filtered through a 120-mesh filter cloth to obtain component B; and components A and B are uniformly mixed.

[0038] Example 4, an impact-resistant environment-friendly acrylic modified polyurethane floor paint, which comprises: component A and component B, and the mass ratio of component A to component B is 1:12.

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

[0040] The impact-resistant modifier is prepared by the following steps: 70g of graphene oxide and 7g of silane coupling agent KH560 are added to 450g of 55% mass fraction ethanol aqueous solution, stirred at a speed of 700r / min for 18min, the stirring temperature is 73℃, 18g of amino-terminated polyamidoamine dendrimer is added under nitrogen protection, stirred at a temperature of 73℃ for 5h, 7g of triethylamine and 18g of butanediol diglycidyl ether are added, stirred for 80min, and then the system is cooled to room temperature, the pH value of the system is adjusted to 7-8, filtered, washed, vacuum dried, and crushed.

[0041] The preparation method of the above-mentioned impact-resistant environment-friendly acrylic modified polyurethane floor paint comprises the following steps: adding an impact-resistant modifier and a wetting agent X-405 into deionized water and stirring uniformly, adding iron oxide green, superfine mica powder and superfine quartz powder under stirring, stirring at a speed of 1800 r / min for 13 min, grinding to D90≤30 μm to obtain a premix; adding a hydroxyl acrylic emulsion, a polycaprolactone triol, a polyether defoaming agent, an EPW preservative and a polyurethane thickening agent into the premix and stirring uniformly, filtering with a 120-mesh filter cloth to obtain component B; and mixing component A and component B uniformly.

[0042] Example 5, an impact-resistant environment-friendly acrylic modified polyurethane floor paint, which comprises: component A and component B, and the mass ratio of component A to component B is 1:10.

[0043] Component A comprises: a water-based aliphatic isocyanate prepolymer; component B comprises: a hydroxyl acrylic emulsion 500 g, a polycaprolactone triol 30 g, an impact-resistant modifier 20 g, iron oxide green 40 g, superfine mica powder with a fineness of 1250 mesh 100 g, superfine quartz powder with a fineness of 1000 mesh 100 g, wetting agent X-405 15 g, polyether defoaming agent 15 g, EPW preservative 15 g, polyurethane thickening agent 15 g and deionized water 120 g.

[0044] The impact-resistant modifier is prepared by the following steps: adding 80 g of graphene oxide and 5 g of silane coupling agent KH560 into 500 g of 50% mass fraction ethanol aqueous solution, stirring at a speed of 800 r / min for 15 min, the stirring temperature is 75℃, adding 15 g of amino-terminated polyamidoamine dendrimer under nitrogen protection, stirring at a temperature of 75℃ for 4 h, adding 8 g of triethylamine and 15 g of butanediol diglycidyl ether, stirring for 90 min, reducing to room temperature, adjusting the pH value of the system to 7-8, filtering, washing, vacuum drying and crushing.

[0045] The preparation method of the above-mentioned impact-resistant environment-friendly acrylic modified polyurethane floor paint comprises the following steps: adding an impact-resistant modifier and a wetting agent X-405 into deionized water and stirring uniformly, adding iron oxide green, superfine mica powder and superfine quartz powder under stirring, stirring at a speed of 1500 r / min for 15 min, grinding to D90≤30 μm to obtain a premix; adding a hydroxyl acrylic emulsion, a polycaprolactone triol, a polyether defoaming agent, an EPW preservative and a polyurethane thickening agent into the premix and stirring uniformly, filtering with a 120-mesh filter cloth to obtain component B; and mixing component A and component B uniformly.

[0046] Comparative Example 1, an impact-resistant environment-friendly acrylic modified polyurethane floor paint, which comprises: component A and component B, and the mass ratio of component A to component B is 1:10.

[0047] A component includes: water-based aliphatic isocyanate prepolymer; B component includes: hydroxyl acrylic emulsion 500g, polycaprolactone triol 30g, impact modifier 20g, iron oxide green 40g, superfine mica powder with fineness of 1250 mesh 100g, superfine quartz powder with fineness of 1000 mesh 100g, wetting agent X-405 15g, polyether defoamer 15g, EPW preservative 15g, polyurethane thickening agent 15g, deionized water 120g.

[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% mass fraction ethanol aqueous solution, stirred at a speed of 800r / min for 15min, the stirring temperature is 75℃, 15g of amino-terminated polyamidoamine star polymer is added under nitrogen protection, stirred at a temperature of 75℃ for 4h, filtered, washed, vacuum dried, and crushed.

[0049] The preparation method of the impact-resistant environment-friendly acrylic modified polyurethane floor coating described above comprises the following steps: the impact modifier and wetting agent X-405 are added to deionized water and stirred uniformly, the iron oxide green, superfine mica powder and superfine quartz powder are added under stirring, stirred at a speed of 1500r / min for 15min, ground to D90≤30μm, and a premix is obtained; the hydroxyl acrylic emulsion, polycaprolactone triol, polyether defoamer, EPW preservative and polyurethane thickening agent are added to the premix and stirred uniformly, filtered with a filter cloth with a mesh size of 120 to obtain component B; components A and B are mixed uniformly.

[0050] Comparative example 2, an impact-resistant environment-friendly acrylic modified polyurethane floor coating, the raw materials of which include: component A and component B, the mass ratio of component A to component B is 1:10.

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

[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

[0056] Example 5 Comparative Example 1 Comparative Example 2 Pencil hardness 3H H 2H Adhesion 0 grade 1 grade 2 grade

[0057] 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.

[0058] 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).

[0059] The reason for the above results is that the dendritic structure of PAMAM in the impact modifier is used to prevent the re-stacking of graphene oxide sheets by physical entanglement and chemical bonding, and butanediol diglycidyl ether is introduced to increase the flexibility of the molecular chain and the density of the hydroxyl group, effectively improve the reactivity with isocyanate, shorten the film forming time, and at the same time, improve the crosslinking density, significantly improve the impact strength and wear resistance of the coating. The hydroxyl acrylic emulsion in the application can condense with the silicon hydroxyl group in the cement base material, and the flexible segment of polycaprolactone can fill the capillary pores by physical penetration, and the hydroxyl acrylic emulsion, polycaprolactone polyol and impact modifier are cured with isocyanate, the double crosslinking mechanism not only ensures strong adhesion to the base material, but also makes the coating film have better compactness, and can effectively balance the hardness and impact resistance of the coating film, and the comprehensive performance of the coating film is excellent.

[0060] The above is only a preferred embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. An impact resistant, environmentally friendly, acrylic modified polyurethane floor coating, characterized in that, The raw materials include: A component, B component, the mass ratio of A component to B component is 1:5-15; The A component includes: aqueous aliphatic isocyanate prepolymer; The B component includes by mass fraction: hydroxy acrylic acid emulsion 40-60 parts, polycaprolactone polyol 1-5 parts, impact modifier 1-3 parts, pigment 2-6 parts, filler 10-30 parts, non-ionic wetting agent 1-2 parts, polyether defoamer 1-2 parts, preservative 1-2 parts, polyurethane thickening agent 1-2 parts, water 10-15 parts; The impact modifier is prepared by the following steps: graphene oxide, coupling agent are added to the ethanol aqueous solution and stirred for 10-20 min, the stirring temperature is 70-80℃, under nitrogen protection, amino-terminated polyamide-amine dendrimer is added, stirring at 70-80℃ for 2-6h, triethylamine and butanediol diglycidyl ether are added and stirred for 1-2h, the system is cooled to room temperature, the pH value is adjusted to 7-8, filtration, washing, vacuum drying, and crushing; The mass ratio of graphene oxide, coupling agent, amino-terminated polyamide-amine dendrimer, triethylamine, butanediol diglycidyl ether is 5-10:0.1-1:1-2:0.5-1:1-2.

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

3. The impact resistant, environmentally friendly, acrylic modified polyurethane floor coating according to claim 2, wherein, The fineness of the superfine mica powder is 1250 mesh.

4. The impact resistant, environmentally friendly, acrylic modified polyurethane floor coating according to claim 2, wherein, The fineness of the superfine quartz powder is 800-1000 mesh. 5.The impact-resistant, environmentally friendly, acrylic-modified polyurethane floor coating according to claim 1, wherein, The pigment is at least one of yellow iron oxide, red iron oxide, black iron oxide, phthalocyanine blue, phthalocyanine green, and rutile titanium dioxide. 6.The impact-resistant, environmentally friendly, acrylic-modified polyurethane floor coating according to claim 1, wherein, The coupling agent is silane coupling agent KH560.

7. A process for the preparation of an impact resistant, environmentally friendly, acrylic modified polyurethane floor coating as claimed in any one of claims 1 to 6, characterized in that, The method includes the following steps: the impact modifier and non-ionic wetting agent are added to water and stirred uniformly, the pigment and filler are added under stirring, stirring for 10-20 min, and grinding to obtain a premix; the hydroxy acrylic acid emulsion, polycaprolactone polyol, polyether defoamer, preservative, and polyurethane thickening agent are added to the premix and stirred uniformly, and the B component is obtained by filtration; the A component and the B component are mixed uniformly.

8. The method of claim 7, wherein the impact-resistant eco-friendly acrylic modified polyurethane floor coating is prepared by mixing the components (A) to (D) in the order of (A) to (D) or (D) to (A). Grinding to D90≤30μm.

Images