Environment-friendly high-gloss wear-resistant waterborne epoxy floor paint and preparation method thereof

Abstract

The invention relates to the technical field of nano-composite water-based resin system design and function coordinated regulation and control, in particular to environment-friendly high-gloss wear-resistant water-based epoxy floor paint and a preparation method thereof. The environment-friendly high-gloss wear-resistant water-based epoxy floor paint is prepared from self-emulsifying water-based epoxy resin emulsion, a modified water-based epoxy curing agent containing biguanidyl and the like; the preparation method comprises the following steps: carrying out synergistic modification on a three-dimensional composite wear-resistant filler containing nano silicon dioxide-carbon nanotube-graphene through a silane coupling agent and dopamine; the light response type composite light stabilizer is compounded by a titanium dioxide grafted hindered amine light stabilizer and a benzophenone light stabilizer; a phase change temperature adjusting microcapsule and a nano-silver-chitosan antibacterial agent can also be added, so that multiple functions are realized. According to the floor paint disclosed by the invention, through an innovative formula and process, wear resistance, luster and weather resistance are remarkably improved, and toughness and crack resistance are enhanced; and the preparation method is environment-friendly and efficient, meets the requirements of multiple scenes, and has high economic value.

Description

Technical Field

[0001] This invention relates to the field of nanocomposite waterborne resin system design and functional synergistic regulation technology, specifically to an environmentally friendly high-gloss wear-resistant waterborne epoxy floor coating and its preparation method. Background Technology

[0002] With increasing environmental awareness and rising demand for high-quality industrial and residential spaces, waterborne epoxy floor coatings, with their advantages of low VOC emissions and environmental safety, are gradually becoming an ideal alternative to traditional solvent-based floor coatings, and are widely used in factory workshops, commercial spaces, underground parking garages, and other scenarios. However, existing waterborne epoxy floor coatings still have many shortcomings in performance and preparation technology, making it difficult to meet the increasingly diverse market demands.

[0003] Traditional water-based epoxy floor coatings often use common fillers such as calcium carbonate and talc. These fillers have weak bonding with the resin matrix, making it difficult to effectively disperse and withstand external frictional stress. This leads to problems such as wear and sanding on the surface of the floor coating during long-term use. Even with the addition of reinforcing fillers such as nano-silica, their tendency to agglomerate in the water-based system prevents them from forming a uniform and stable dispersion structure, thus failing to fully exert their reinforcing effect. Consequently, the wear resistance life of the floor coating is far lower than the actual usage requirements.

[0004] Existing water-based epoxy floor coatings often fail to achieve a high-gloss finish after film formation, and are prone to gloss fading, yellowing, and chalking under environmental factors such as ultraviolet radiation, high temperature, and high humidity. This is mainly because traditional light stabilizers have poor compatibility in water-based systems, failing to effectively capture and absorb ultraviolet rays. Additionally, the water-based resins themselves have limited weather resistance, making them vulnerable to environmental erosion. Furthermore, the evaporation of water in water-based epoxy floor coatings leads to significant shrinkage stress within the coating. Traditional toughening agents have limited toughening effects and cannot effectively alleviate this stress concentration, making the floor coating prone to cracking during use, affecting aesthetics and lifespan. Moreover, existing water-based epoxy floor coatings are relatively limited in functionality, lacking special functions such as antibacterial and temperature-regulating properties, making it difficult to meet the needs of special locations such as hospitals and food processing plants.

[0005] Existing technologies have shortcomings in filler dispersion, component mixing uniformity, and curing agent synthesis. Ordinary stirring and dispersion methods struggle to achieve uniform dispersion of nano-sized fillers, leading to unstable floor coating performance. The curing agent synthesis process is simple, but the distribution of active groups is uneven, resulting in poor compatibility with waterborne epoxy resins, affecting curing effects and coating performance. Furthermore, existing preparation processes are energy-intensive and inefficient, failing to meet the demands of large-scale industrial production. Therefore, developing an environmentally friendly waterborne epoxy floor coating and its preparation method that combines high wear resistance, high gloss, excellent weather resistance, and multifunctionality with advanced processing technology has become a crucial issue urgently needing to be addressed in the field of flooring materials.

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides an environmentally friendly, high-gloss, wear-resistant waterborne epoxy floor coating and its preparation method.

[0008] (II) Technical Solution

[0009] An environmentally friendly, high-gloss, wear-resistant waterborne epoxy floor coating, by weight, comprises the following components: 32-38 parts of self-emulsifying waterborne epoxy resin emulsion, 18-22 parts of biguanide-modified waterborne epoxy curing agent, 12-18 parts of nano-silica-carbon nanotube-graphene three-dimensional composite wear-resistant filler, 4-5 parts of photoresponsive composite light stabilizer, 6-9 parts of hydroxyl-terminated hyperbranched polyester elastomer toughening agent, 0.8-1.2 parts of organosilicon-polyether block copolymer defoamer, 1-1.3 parts of fluorine-modified acrylate leveling agent, and 22-28 parts of deionized water; wherein, the nano-silica-carbon nanotube-graphene three-dimensional composite wear-resistant filler is synergistically modified by silane coupling agent KH-570 and dopamine, and the structure of the silane coupling agent KH-570 is as follows:

[0010]

[0011] Photoresponsive composite light stabilizers are composed of hindered amine light stabilizers grafted with titanium dioxide nanoparticles and benzophenone-based light stabilizers in a mass ratio of 3:2. The reaction formula is as follows:

[0012]

[0013] R is an organic linking group, and R1 is a functional group of the hindered amine light stabilizer.

[0014] Preferably, the product also includes 1-2 portions of phase change temperature-regulating microcapsules, wherein the phase change temperature-regulating microcapsules use lauric acid-decanoic acid eutectic as the core material and urea-formaldehyde-melamine resin as the wall material, with a particle size of 15-25μm and a phase change temperature of 25-28℃.

[0015] Preferably, it also includes 0.5-1 parts of nano-silver-chitosan antibacterial agent, the nano-silver particle size is 8-12nm, the chitosan deacetylation degree is ≥90%, and it is prepared into nanofibers with a diameter of 200-300nm by electrospinning.

[0016] Preferably, the self-emulsifying waterborne epoxy resin emulsion is prepared by ring-opening esterification reaction of bisphenol A epoxy resin and polyethylene glycol monomethyl ether, with an epoxy value of 0.35-0.45 mol / 100g and a hydrophilic segment ratio of 25-30%.

[0017] Preferably, the biguanide-modified waterborne epoxy curing agent is prepared by reacting alicyclic amine with dicyandiamide and epichlorohydrin, followed by quaternization with dodecyl dimethyl tertiary amine, with an active hydrogen equivalent of 120-140 g / eq and a solid content of 45-50%.

[0018] Preferably, in the three-dimensional composite wear-resistant filler of nano-silica-carbon nanotube-graphene, the mass ratio of nano-silica, carbon nanotube, and graphene is 4:1:1, the length of carbon nanotube is 1-3μm, and the size of graphene sheets is 8-12μm.

[0019] Preferably, the preparation method of the environmentally friendly high-gloss wear-resistant waterborne epoxy floor coating according to any one of the above-mentioned methods includes the following steps:

[0020] S1: Filler modification; Nano-silica, carbon nanotubes and graphene are dispersed in an ethanol-water mixture in a certain proportion, and 3-4% by mass of silane coupling agent KH-570 and 2-3% by mass of dopamine hydrochloride are added. The mixture is stirred at 50-60℃ for 4-5 hours and then vacuum dried to obtain the composite filler.

[0021] S2: Curing agent synthesis; Alicyclic amine, dicyandiamide and epichlorohydrin were reacted sequentially at 80-90℃ for 3 hours, and dodecyl dimethyl tertiary amine was added and quaternized at 60-70℃ for 2 hours to obtain a water-based epoxy curing agent.

[0022] S3: Premixing and dispersing; Stir the aqueous epoxy resin emulsion and deionized water in a reactor at 400-600 r / min for 15-20 minutes, add composite filler, light stabilizer and toughening agent, and continue stirring for 30-40 minutes;

[0023] S4: Grinding and homogenization; Transfer the premix to a sand mill and grind it with 0.3-0.8mm zirconia beads as the medium until the particle size is ≤25μm, and then process it in a high shear homogenizer at 20000-25000r / min for 10-15 minutes;

[0024] S5: Additives; add defoamer, leveling agent, antibacterial agent and phase change temperature-regulating microcapsules in sequence, stir at 500-700r / min for 20-25 minutes, and finally add water-based epoxy curing agent and stir evenly.

[0025] Preferably, in step S1, ultrasonic-magnetic stirring is used for synergistic dispersion, with ultrasonic power of 300-500W and stirring speed of 800-1000r / min.

[0026] Preferably, in step S4, the grinding temperature of the sand mill is controlled at 35-45℃, and the temperature is controlled by circulating cooling water.

[0027] Preferably, after step S5, the floor coating is subjected to vacuum degassing treatment with a vacuum degree of 0.08-0.09 MPa and a treatment time of 15-20 minutes.

[0028] (III) Beneficial Technical Effects

[0029] Compared with existing technologies, the beneficial effects of this invention are:

[0030] 1. The nano-silica-carbon nanotube-graphene three-dimensional composite wear-resistant filler, through special modification, forms a stable and dispersed three-dimensional network structure in an aqueous system, effectively dispersing stress and significantly improving the wear resistance of the coating. The wear resistance test rotation number is higher than that of traditional products.

[0031] 2. The synergistic effect of the photoresponsive composite light stabilizer and the self-emulsifying waterborne epoxy resin emulsion not only achieves a surface gloss of over 90 GU for the floor coating, but also maintains a gloss retention rate of over 85% after 1000 hours of UV irradiation, effectively inhibiting yellowing and chalking. The hydroxyl-terminated hyperbranched polyester elastomer toughening agent, through chemical bonding with the epoxy resin, significantly improves coating toughness, reduces shrinkage stress, enhances the crack resistance of the floor coating, and effectively extends its service life.

[0032] 3. The added phase change temperature-regulating microcapsules can automatically regulate the ambient temperature and maintain a comfortable ground temperature; the nano silver-chitosan antibacterial agent gives the floor paint highly efficient antibacterial properties, with an antibacterial rate of over 99% against Escherichia coli and Staphylococcus aureus, meeting the needs of special locations.

[0033] 4. The use of ultrasonic-magnetic stirring synergistic dispersion and high-shear homogenization technologies ensures uniform dispersion of nano-sized fillers. An innovative curing agent synthesis process improves the compatibility between the curing agent and the resin, resulting in more complete curing. Simultaneously, the process reduces energy consumption, increases production efficiency, and is both environmentally friendly and economical, possessing broad market application prospects. Attached Figure Description

[0034] Figure 1 A flowchart of an environmentally friendly, high-gloss, wear-resistant water-based epoxy floor coating and its preparation method.

[0035] Figure 2 This is a bar graph comparing the wear resistance and gloss of the examples and comparative examples.

[0036] Figure 3 These are line graphs showing the weather resistance of the embodiments and comparative examples.

[0037] Figure 4 This is a bar chart showing the antibacterial rates of the examples and comparative examples. Detailed Implementation

[0038] according to Figures 1 to 4 The specific embodiments of the present invention are as follows:

[0039] Example 1

[0040] S1: Filler modification

[0041] Nano-silica, carbon nanotubes, and graphene were weighed at a mass ratio of 4:1:1. The nano-silica particles had a diameter of 30 nm, the carbon nanotubes a length of 1.5 μm, and the graphene sheets a size of 9 μm. They were dispersed in an ethanol-water mixture (volume ratio 3:1) and subjected to ultrasonic-magnetic stirring at an ultrasonic power of 300 W and a stirring speed of 800 r / min.

[0042] 3% (w / w) of silane coupling agent KH-570 and 2% (w / w) of dopamine hydrochloride were added, and the mixture was stirred at 50°C for 4 hours. Nitrogen gas was continuously purged during the reaction at a flow rate of 5 L / min. After the reaction, the mixture was vacuum dried to obtain a three-dimensional composite wear-resistant filler consisting of nano-silica, carbon nanotubes, and graphene.

[0043] S2: Curing agent synthesis

[0044] Cycloalicylic amine, dicyandiamide, and epichlorohydrin were sequentially added to a reactor and reacted at 80°C for 3 hours. Then, dodecyl dimethyl tertiary amine was added, and a quaternization reaction was carried out at 60°C for 2 hours to obtain a biguanide-modified waterborne epoxy curing agent. The curing agent was found to have an active hydrogen equivalent of 120 g / eq and a solid content of 45%.

[0045] S3: Premixed dispersion

[0046] Weigh 32 parts of self-emulsifying waterborne epoxy resin emulsion (epoxy value 0.35mol / 100g, hydrophilic segment percentage 25%) and 22 parts of deionized water and add them to the reactor. Stir at 400r / min for 15 minutes.

[0047] Add 12 parts of the composite filler obtained in step S1, 4 parts of the photoresponsive composite light stabilizer, and 6 parts of the hydroxyl-terminated hyperbranched polyester elastomer toughening agent (branching degree 0.6, number average molecular weight 3000 g / mol), and continue stirring for 30 minutes.

[0048] S4: Grinding and homogenization

[0049] The premix obtained in step S3 was transferred to a sand mill, using 0.3 mm zirconia beads as the grinding medium. The grinding temperature was controlled at 35°C using circulating cooling water. After grinding to a particle size ≤25 μm, it was then processed in a high-shear homogenizer at 20000 r / min for 10 minutes.

[0050] S5: Additives

[0051] 0.8 parts of organosilicon-polyether block copolymer defoamer, 1 part of fluorinated acrylate leveling agent, 0.5 parts of nano-silver-chitosan antibacterial agent (nano-silver particle size 8nm, chitosan deacetylation degree 90%, nanofiber diameter 200nm) and 1 part of phase change temperature-regulating microcapsule (core material is lauric acid-decanoic acid eutectic, wall material is urea-formaldehyde-melamine resin, particle size 15μm, phase change temperature 25℃) were added in sequence.

[0052] Stir at 500 rpm for 20 minutes, then add the water-based epoxy curing agent prepared in step S2 and stir for 10 minutes. After stirring, perform vacuum degassing treatment at a vacuum degree of 0.08 MPa for 15 minutes to obtain an environmentally friendly high-gloss wear-resistant water-based epoxy floor coating.

[0053] Example 2

[0054] S1: Filler modification

[0055] Weigh out appropriate proportions of nano-silica (particle size 40nm), carbon nanotubes (length 2μm) and graphene (sheet size 10μm), disperse them in an ethanol-water mixture, and disperse them under ultrasonic power of 400W and stirring speed of 900r / min.

[0056] Add 3.5% by mass of silane coupling agent KH-570 and 2.5% by mass of dopamine hydrochloride, stir and react at 55°C for 4.5 hours under nitrogen protection at a nitrogen flow rate of 7 L / min, and then vacuum dry to obtain the composite filler.

[0057] S2: Curing agent synthesis

[0058] The curing agent was prepared by reacting at 85°C for 3 hours, followed by quaternization at 65°C for 2 hours. Its active hydrogen equivalent was 130 g / eq, and its solid content was 47%.

[0059] S3: Premixed dispersion

[0060] Take 35 parts of self-emulsifying waterborne epoxy resin emulsion (epoxy value 0.4mol / 100g, hydrophilic segment content 27%) and 25 parts of deionized water, and stir at 400r / min for 15 minutes.

[0061] Add 15 parts of composite filler, 4.5 parts of photoresponsive composite light stabilizer, and 7.5 parts of toughening agent (branching degree 0.7, number average molecular weight 4000 g / mol), and stir for 35 minutes.

[0062] S4: Grinding and homogenization

[0063] The sand mill uses 0.5mm zirconia beads, the grinding temperature is 40℃, and the grinding is carried out until the particle size is ≤25μm. The high shear homogenizer is then used to process the particles for 12 minutes at 22000r / min.

[0064] S5: Additives

[0065] Add 1 part defoamer, 1.1 parts leveling agent, 0.7 parts antibacterial agent (nano silver particle size 10nm, nanofiber diameter 250nm) and 1.5 parts phase change temperature-regulating microcapsules (particle size 20μm, phase change temperature 26℃), and stir at 500r / min for 22 minutes.

[0066] Add curing agent and stir for 12 minutes, then vacuum degas (vacuum degree 0.085MPa, time 17 minutes) to obtain floor paint.

[0067] Example 3

[0068] S1: Filler modification

[0069] Nano-silica (50nm particle size), carbon nanotubes (3μm length) and graphene (12μm sheet size) were selected and dispersed by ultrasonic power of 500W and stirring speed of 1000r / min.

[0070] Add 4% silane coupling agent KH-570 and 3% dopamine hydrochloride, react at 60℃ for 5 hours, nitrogen flow rate 10L / min, and vacuum dry to obtain composite filler.

[0071] S2: Curing agent synthesis

[0072] The reaction was carried out at 90℃ for 3 hours, followed by quaternization at 70℃ for 2 hours. The active hydrogen equivalent of the curing agent was 140 g / eq, and the solid content was 50%.

[0073] S3: Premixed dispersion

[0074] 38 parts of self-emulsifying waterborne epoxy resin emulsion (epoxy value 0.45mol / 100g, hydrophilic segment content 30%) and 28 parts of deionized water were stirred at 600r / min for 20 minutes.

[0075] Add 18 parts of composite filler, 5 parts of photoresponsive composite light stabilizer, and 9 parts of toughening agent (branching degree 0.8, number average molecular weight 5000 g / mol), and stir for 40 minutes.

[0076] S4: Grinding and homogenization

[0077] The sand mill uses 0.8mm zirconia beads, the grinding temperature is 45℃, and the grinding is carried out until the particle size is ≤25μm. The high shear homogenizer is then used to process the particles for 15 minutes at 25000r / min.

[0078] S5: Additives

[0079] Add 1.2 parts of defoamer, 1.3 parts of leveling agent, 1 part of antibacterial agent (nano silver particle size 12nm, nanofiber diameter 300nm) and 2 parts of phase change temperature-regulating microcapsules (particle size 25μm, phase change temperature 28℃), and stir at 700r / min for 25 minutes.

[0080] Add curing agent and stir for 15 minutes, then vacuum degas (vacuum degree 0.09MPa, time 20 minutes) to obtain floor paint.

[0081] Comparative Example

[0082] S1: Packing treatment

[0083] Ordinary nano-silica was weighed out without any modification treatment.

[0084] S2: Preparation of curing agent

[0085] Common alicyclic amine waterborne epoxy curing agents are used.

[0086] S3: Mixed Dispersion

[0087] Add 30 parts of ordinary waterborne epoxy resin emulsion, 15 parts of curing agent, 10 parts of ordinary nano silica, 3 parts of ordinary light stabilizer, 5 parts of ordinary toughening agent, 0.5 parts of defoamer, 0.5 parts of leveling agent and 20 parts of deionized water to the reactor and stir at 300 r / min for 20 minutes.

[0088] S4: Grinding

[0089] The mixture was transferred to a sand mill and ground until the particle size was less than 30 μm.

[0090] S5: Finished Product

[0091] After thorough mixing, no vacuum degassing treatment was performed, resulting in a comparative proportion of water-based epoxy floor paint.

[0092] Performance testing

[0093] The environmentally friendly, high-gloss, wear-resistant waterborne epoxy floor coating developed in this invention exhibits significant advantages in all performance indicators. The wear resistance test results of the three examples are 10 mg / 1000r, 8 mg / 1000r, and 6 mg / 1000r, respectively, far superior to the comparative example's 30 mg / 1000r, indicating its excellent wear resistance. Regarding gloss, Examples 1 to 3 achieve high gloss levels of 92 GU, 95 GU, and 96 GU, respectively, significantly higher than the comparative example's 70 GU. Weather resistance tests show that after 1000 hours of aging, the gloss retention rate of the three examples remains between 86% and 90%, while the comparative example only maintains 60%. In terms of crack resistance, all examples meet the Grade 1 standard, while the comparative example is Grade 3. Particularly noteworthy is the outstanding antibacterial performance of the examples, with an antibacterial rate of 99% to 99.8% against Escherichia coli, far exceeding the comparative example's 30%. Furthermore, the embodiments also demonstrate excellent temperature regulation performance, controlling temperature fluctuations within ±1℃ to ±2℃, a capability completely absent in the comparative examples. These data fully demonstrate that the floor coating product of the present invention significantly outperforms traditional products in multiple key indicators such as abrasion resistance, gloss, weather resistance, crack resistance, antibacterial properties, and temperature regulation performance.

[0094] The following table compares the abrasion resistance and gloss properties of the examples and comparative examples:

[0095] Table 1

[0096]

[0097]

[0098] Conclusion: This table compares the key indicators of abrasion resistance and gloss of the floor coatings in the examples and comparative examples. The data shows that the abrasion loss of the examples is significantly lower than that of the comparative examples, while the gloss is significantly higher, clearly demonstrating the advantages of the product of this invention in terms of basic performance.

[0099] The functionality and durability of the examples and comparative examples are compared in the table below:

[0100] Table 2

[0101] project Example 1 Example 2 Example 3 Comparative Example Weather resistance (gloss retention rate over 1000 hours) 86％ 88％ 90％ 60％ Crack resistance (crack grade) Level 1 Level 1 Level 1 Level 3 Antibacterial rate (E. coli) 99％ 99.5％ 99.8％ 30％ Temperature regulation performance (temperature fluctuation range) ±2℃ ±1.5℃ ±1℃ none

[0102] Conclusion: This table covers indicators such as weather resistance, crack resistance, antibacterial properties, and temperature regulation. The example demonstrates superior performance compared to the comparative example in all functional and durability indicators, indicating that the product of this invention can meet the needs of multiple usage scenarios, offering more stable performance and richer functionality.

[0103] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly, high-gloss, wear-resistant water-based epoxy floor coating, characterized in that, By weight, it comprises the following components: 32-38 parts self-emulsifying waterborne epoxy resin emulsion, 18-22 parts waterborne epoxy curing agent modified with biguanide groups, 12-18 parts three-dimensional composite wear-resistant filler of nano-silica-carbon nanotube-graphene, 4-5 parts photoresponsive composite light stabilizer, 6-9 parts hydroxyl-terminated hyperbranched polyester elastomer toughening agent, 0.8-1.2 parts organosilicon-polyether block copolymer defoamer, 1-1.3 parts fluorine-modified acrylate leveling agent, and 22-28 parts deionized water; wherein, the three-dimensional composite wear-resistant filler of nano-silica-carbon nanotube-graphene is synergistically modified by silane coupling agent KH-570 and dopamine, and the structure of the above-mentioned silane coupling agent KH-570 is as follows: Photoresponsive composite light stabilizers are composed of hindered amine light stabilizers grafted with titanium dioxide nanoparticles and benzophenone-based light stabilizers in a mass ratio of 3:

2. The reaction formula is as follows:

2. The environmentally friendly, high-gloss, wear-resistant water-based epoxy floor coating according to claim 1, characterized in that, It also includes 1-2 portions of phase change temperature-regulating microcapsules, wherein the phase change temperature-regulating microcapsules use lauric acid-decanoic acid eutectic as the core material and urea-formaldehyde-melamine resin as the wall material, with a particle size of 15-25μm and a phase change temperature of 25-28℃.

3. The environmentally friendly, high-gloss, wear-resistant water-based epoxy floor coating according to claim 1, characterized in that, It also includes 0.5-1 parts of nano-silver-chitosan antibacterial agent, with nano-silver particle size of 8-12nm and chitosan deacetylation degree ≥90%, which is prepared into nanofibers with a diameter of 200-300nm by electrospinning.

4. The environmentally friendly, high-gloss, wear-resistant water-based epoxy floor coating according to claim 1, characterized in that, The self-emulsifying waterborne epoxy resin emulsion is prepared by bisphenol A epoxy resin and polyethylene glycol monomethyl ether through a ring-opening esterification reaction, with an epoxy value of 0.35-0.45 mol / 100g and a hydrophilic segment ratio of 25-30%.

5. The environmentally friendly, high-gloss, wear-resistant water-based epoxy floor coating according to claim 1, characterized in that, The biguanide-modified waterborne epoxy curing agent is prepared by reacting alicyclic amines with dicyandiamide and epichlorohydrin, followed by quaternization with dodecyl dimethyl tertiary amine, with an active hydrogen equivalent of 120-140 g / eq and a solid content of 45-50%.

6. The environmentally friendly, high-gloss, wear-resistant water-based epoxy floor coating according to claim 1, characterized in that, In the aforementioned three-dimensional composite wear-resistant filler of nano-silica-carbon nanotube-graphene, the mass ratio of nano-silica, carbon nanotube, and graphene is 4:1:1, the length of carbon nanotube is 1-3μm, and the size of graphene sheets is 8-12μm.

7. A method for preparing an environmentally friendly, high-gloss, wear-resistant waterborne epoxy floor coating as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Filler modification; Nano-silica, carbon nanotubes and graphene are dispersed in an ethanol-water mixture in a certain proportion, and 3-4% by mass of silane coupling agent KH-570 and 2-3% by mass of dopamine hydrochloride are added. The mixture is stirred at 50-60℃ for 4-5 hours and then vacuum dried to obtain the composite filler. S2: Curing agent synthesis; Alicyclic amine, dicyandiamide and epichlorohydrin were reacted sequentially at 80-90℃ for 3 hours, and dodecyl dimethyl tertiary amine was added and quaternized at 60-70℃ for 2 hours to obtain a water-based epoxy curing agent. S3: Premixing and dispersing; Stir the aqueous epoxy resin emulsion and deionized water in a reactor at 400-600 r / min for 15-20 minutes, add composite filler, light stabilizer and toughening agent, and continue stirring for 30-40 minutes; S4: Grinding and homogenization; Transfer the premix to a sand mill and grind it with 0.3-0.8mm zirconia beads as the medium until the particle size is ≤25μm, and then process it in a high shear homogenizer at 20000-25000r / min for 10-15 minutes; S5: Additives; add defoamer, leveling agent, antibacterial agent and phase change temperature-regulating microcapsules in sequence, stir at 500-700r / min for 20-25 minutes, and finally add water-based epoxy curing agent and stir evenly.

8. The preparation method according to claim 7, characterized in that, In step S1, ultrasonic-magnetic stirring is used for synergistic dispersion, with ultrasonic power of 300-500W and stirring speed of 800-1000r / min.

9. The preparation method according to claim 7, characterized in that, In step S4, the grinding temperature of the sand mill is controlled at 35-45℃, and the temperature is controlled by circulating cooling water.

10. The preparation method according to claim 7, characterized in that, After step S5, the floor coating is subjected to vacuum degassing treatment with a vacuum degree of 0.08-0.09 MPa and a treatment time of 15-20 minutes.

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