Water-based multifunctional porcelain glaze coating and preparation method thereof

Abstract

The invention discloses a water-based multifunctional porcelain glaze coating and a preparation method thereof, and relates to the technical field of building materials. The water-based multifunctional porcelain glaze coating at least comprises the following raw materials: 10-40 parts by weight of modified water-soluble resin; 10-20 parts by weight of water-soluble waterproof powder; 30-60 parts by weight of a filler; 0.5-1 part by weight of an auxiliary agent; 30 to 50 parts by weight of water; wherein the water-soluble waterproof powder is silane modified protective colloid, and the modified water-soluble resin is graphene oxide modified water-soluble acrylic resin. The water-based multifunctional porcelain glaze coating prepared by the invention can inhibit base material saltpetering, enhance the freeze-thaw resistance of the base material and improve the waterproof and anti-seepage performance of the interior and exterior of the base material.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a water-based multifunctional enamel coating and a preparation method thereof. Background Art

[0002] Waterproofing and anti-seepage work in construction projects has become a vital part of current construction projects, and waterproof materials are the key tools for building waterproof and anti-seepage performance. With the significant improvement in the quality of life standards, the waterproof performance of construction projects and their construction systems have gradually improved to meet the actual needs of construction projects in many aspects. In recent years, China has made significant progress in improving the performance of waterproof materials and optimizing product structures. A large number of new waterproof materials have gradually replaced those traditional waterproof materials with poor effects, and new construction methods and technologies have continuously emerged in the field of building waterproofing.

[0003] In the field of construction and civil engineering, concrete is generally made of a mixture of gel materials, aggregates and water. After ordinary concrete is formed, it often seeps or even leaks. The causes of seepage and leakage are generally attributed to two categories in the industry. One is that there are some cracks or small channels inside the concrete itself. Under external forces such as water pressure, water slowly seeps from one side to the other; the other is due to the capillary effect. Due to the difference between cohesion and adhesion, water is absorbed from one side to the other. Due to the existence of the above-mentioned seepage or leakage reasons, concrete and mortar will crack, carbonize, steel bar rust, freeze-thaw damage, and the crystallization of salt in saline water will cause volume increase and expansion, causing structural destructive cracking. Water condensation adsorbs indoor walls to cause mold. The higher the water content of the wall, the higher the thermal conductivity and the more shrinkage deformation. For the outer concrete of the building, such as the roof, facade, kitchen and bathroom, it will cause damage to the interior, seriously affecting the comfort of living, and will cause serious safety hazards. Therefore, before and after pouring concrete, it is necessary to make an external membrane waterproof layer separately, but such waterproofing is easy to be damaged, aged and lose its waterproof function, and the construction process is complicated, time-consuming and inefficient. Alternatively, a waterproofing agent is added to concrete with cement as the main cementitious material, but the capillaries and tiny gaps formed after hydration are difficult to be completely filled by existing waterproof materials, and water seepage is easy to occur over a long period of time. In addition, the use of micro-expansion materials is easy to damage the concrete structure, and the material is easy to decompose and fail. Therefore, it is of great application prospect to develop a waterproofing agent that can make the substrate have waterproof and anti-seepage effects both inside and outside. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based multifunctional enamel coating and a preparation method thereof, so as to solve the following technical problems:

[0005] The existing porcelain glaze coating for concrete mortar has the problems of poor waterproof and anti-seepage effect, poor wear resistance and easy falling off, and inability to be used in substrates.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A water-based multifunctional enamel coating and a preparation method thereof, comprising at least the following raw materials in parts by weight:

[0008]

[0009] Wherein, the water-soluble waterproof powder is a silane-modified protective colloid, and the modified water-soluble resin is a graphene oxide-modified water-soluble acrylic resin.

[0010] As a further solution of the present invention: the preparation method of the water-soluble waterproof powder comprises the following steps:

[0011] The protective colloid is added into water to dissolve to prepare a protective colloid solution with a solid content of 30-50%, and a silane coupling agent is added, stirred for 5-30 minutes, and spray-dried to obtain a water-soluble waterproof powder.

[0012] As a further solution of the present invention: the spray drying parameters are set as: inlet temperature 120-160°C, outlet temperature 70-110°C, feed rate 1-5kg / h, atomizer speed 20000-30000r / min.

[0013] As a further embodiment of the present invention: the mass ratio of the silane coupling agent to the protective colloid is 1-2:1, and the silane coupling agent is one or more of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-glycidyl ether propylmethyldiethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, vinyltrimethoxysilane and γ-mercaptopropyltrimethoxysilane.

[0014] As a further solution of the present invention: the protective colloid is at least one of polyvinyl alcohol, animal glue, gelatin, methyl cellulose, carboxymethyl cellulose, gum arabic or sodium polyacrylate.

[0015] As a further solution of the present invention: the preparation method of the graphene oxide modified water-soluble acrylic resin comprises at least the following steps:

[0016] The graphite oxide powder is added to a deionized water-ethanol mixture, subjected to ultrasonic exfoliation for 30 minutes, a silane coupling agent is added, and the temperature is raised to 70-80° C., and the reaction is performed for 10-15 hours. After the reaction, the product is filtered, washed and dried to obtain silane-modified graphene oxide;

[0017] Mix isocyanate, acetone and a catalyst, and heat to 40-50° C., add the silane-modified graphene oxide, react for 2-4 hours, then drop the catalyst, stir well and heat to 60-80° C., then drop the hydroxy acrylate monomer, react for 2-6 hours, and obtain a modifier;

[0018] The acrylic monomer, the modifier and the initiator are fully mixed, and then dripped into a solvent heated to 80-90° C., the reaction temperature is controlled to be 85-90° C., and the dripping is completed within 3-4 hours. After the dripping is completed, the system is kept warm for 1-2 hours, and the initiator is added to the reaction system. After the heat preservation is continued for 2-4 hours, the solvent in the system is extracted under vacuum, the temperature is lowered to 50-60° C., N,N-dimethylethanolamine is added to the system for neutralization, and the end point is when the pH reaches 7-8, thereby obtaining a water-oxidized graphene-modified water-soluble acrylic resin.

[0019] As a further embodiment of the present invention: the hydroxy acrylate monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl methacrylate, and the acrylic acid monomer is one or more of methyl methacrylate, butyl acrylate, or acrylic acid.

[0020] As a further solution of the present invention: the filler is at least one of cement, quartz sand, quartz powder, wollastonite powder, calcium carbonate, barium sulfate and river sand.

[0021] As a further embodiment of the present invention: the auxiliary agent is at least one of a defoamer, a dispersant, a wetting agent, a preservative, a thickener or a curing agent.

[0022] A method for preparing any of the above-mentioned water-based multifunctional enamel coatings comprises at least the following steps:

[0023] The modified water-soluble resin, water-soluble waterproof powder, auxiliary agent and filler are mixed evenly to obtain a mixed dry powder, and then water is added to the mixed dry powder and stirred evenly to obtain the water-based multifunctional enamel paint.

[0024] Beneficial effects of the present invention:

[0025] The present application prepares a water-based multifunctional enamel coating by using a paper cup water-soluble waterproof powder and a modified water-soluble resin, and then adding fillers and additives. The water-soluble resin is a water-soluble acrylic resin modified with graphene oxide, and the water-soluble waterproof powder is a protective colloid modified with silane. Both are water-soluble polymers. The water solubility enables the modified material to be well dispersed in dry powder or mortar. Through the modification of graphene oxide and silane, the coating has the performance of inhibiting the alkali efflux of the substrate and enhancing the anti-freezing and thawing of the substrate, which is beneficial to the substrate to maintain its beauty and color, high weather resistance, UV resistance, and also improves the waterproof and anti-seepage performance inside and outside the substrate. The water-based multifunctional porcelain glaze coating of the present application has good water solubility, good dispersibility, high activity, free flow, and can be fully and evenly dispersed in powder or slurry. It can be widely used for internal or external sealing, waterproofing, anti-seepage and leakage repair of waterproof projects such as water towers, pools, roofs, basements, tunnels, roads, civil air defense, etc. It can also be used for waterproofing and anti-leakage of porous material blocks such as aerated concrete and hollow bricks and various decorative layers.

[0026] The modified water-soluble resin in the present application is based on acrylic resin, and the silane-modified graphene oxide of grafted isocyanate is used as a modifier. Through the effect of chemical covalent bonds, the modification of acrylic resin by graphene oxide is realized. The introduction of the modifier is not connected to the acrylic resin system by a simple physical connection method, but is connected to the acrylic resin by the effect of a covalent bond. This connection method is more solid, so that the coating is not easy to be scratched in the friction resistance test, and the wear resistance of the coating is improved. With the dissolution of the water-soluble resin, the graphene oxide is evenly distributed in the coating. The introduction of graphene oxide is conducive to introducing the excellent performance of graphene oxide itself into the system, and improving the adhesion, water resistance, thermal stability, etc. of the water-soluble acrylic resin. At the same time, the oxygen-containing functional groups on the original graphene oxide surface are also introduced into the coating, which increases the cross-linking sites of the coating to a certain extent, promotes the cross-linking degree of the coating, and enhances the hydrophobicity of the coating, providing long-term hydrophobic protection for the substrate without weakening the strength of the substrate, thereby achieving waterproof and anti-seepage effects both inside and outside the substrate. It is applied to building mortar, cement concrete and building coatings. In addition to high adhesion, flexibility and lateral deformation ability, the product can perform better in harsh environments. Water and temperature resistance, UV resistance, yellowing resistance, and self-cleaning resistance.

[0027] The water-soluble waterproof powder in the water-based multifunctional porcelain glaze coating obtained in the present application utilizes a protective colloid that is easily soluble in water. The protective colloid is modified with a silane group by a spray drying method, and can be rapidly dissolved in the stirring of concrete mortar with water, so that the silanol group is cross-linked with the cement hydration product, and the silane group is fixed on the surface of the cement mortar pore wall to achieve honeycomb grid waterproof performance, prevent the capillary pores in the material from absorbing water, and cross-link with the modified water-soluble resin. While ensuring waterproofness and anti-seepage, it can also meet the requirements of anti-freezing and thawing properties. It can be applied to rigid waterproof mortar, plastering mortar, thin plastering mortar, external insulation plastering mortar, exterior wall putty, soft stone, real stone paint, tile caulking agent, anti-seepage tile adhesive, facing color mortar, cement prefabricated parts, inorganic terrazzo slabs and other concrete mortar substrates External structure waterproofing and anti-seepage, as well as repair and reinforcement of concrete buildings and structures, improve the durability of cement concrete, extend the service life of the structure, and ensure the safe use of the building. DETAILED DESCRIPTION

[0028] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0029] The preparation steps of the modified water-soluble resin of embodiment 1 at least include:

[0030] Put the graphite oxide powder into a beaker, add a deionized water-ethanol mixture, and ultrasonically peel for 30 minutes. Move the graphene oxide dispersion after ultrasonic peeling to a four-necked flask, add the silane coupling agent KH550 to the ethanol solution for thorough mixing, and drip it into the four-necked flask using a constant pressure funnel, and heat it to 78°C for 12 hours. After the reaction is completed, filter the product, wash it with acetone for 3-4 times, and vacuum dry the obtained product at 50°C for 12 hours to obtain silane-modified graphene oxide;

[0031] Isophorone diisocyanate was placed in a four-necked flask, and a certain amount of acetone and 0.02% of the total mass of the system as a catalyst dibutyltin dilaurate were added, and the temperature was raised to 40°C, and the above-mentioned silane-modified graphene oxide was added, and the reaction was carried out for 2 hours. Then, the catalyst dibutyltin dilaurate was added dropwise, and the mixture was fully stirred. The mixture was heated to 70°C in an oil bath, and then hydroxypropyl methylpropionate was added dropwise to the reactor, and the reaction was carried out for 5 hours to obtain a modifier.

[0032] The solvent is added into the reaction kettle and heated to 90°C. The acrylic monomers AA, BA, MMA, the above-mentioned modifiers and the initiator azobisisobutyronitrile are fully mixed and then dripped into the solvent. The reaction temperature is controlled to be 85-90°C. The dripping is completed within 3 hours. After the dripping is completed, the reaction is kept warm for 4 hours. Under vacuum, part of the solvent in the system is extracted, the temperature is lowered to 60°C, and N,N-dimethylethanolamine is added to the system for neutralization to obtain graphene oxide modified water-soluble acrylic resin.

[0033] The preparation steps of the water-soluble waterproof powder at least include:

[0034] 6 parts by weight of protective colloid are added with water and stirred until completely dissolved to prepare a protective colloid solution with a solid content of 30-50%, 8 parts by weight of methyltrimethoxysilane are added with water with a weight of 10-15 times the weight of the water and stirred to obtain a solution, the pH is adjusted to 2-3 with hydrochloric acid, and then the temperature is raised to 40-50° C. for hydrolysis for 5-15 hours to obtain a cross-linking solution, the protective colloid solution is added to the cross-linking solution, and stirred for 5-30 minutes, and finally an anti-caking agent is added to the mixed solution, and stirred for 0.5-2 hours to prepare an emulsion to be spray-dried;

[0035] The spray dryer was set with a spray drying inlet temperature of 150°C, an outlet temperature of 80°C, and a hot air velocity of 4 m / s. 3 / min, feeding speed 50ml / min, atomizer speed 20000r / min, and then start the heating system. When the inlet and outlet temperatures rise to the set value, start the feeding system, atomization system and negative pressure system to spray dry the emulsion and collect the water-soluble waterproof powder.

[0036] The preparation steps of the water-based multifunctional enamel coating at least include:

[0037] 15 parts by mass of modified water-soluble resin, 15 parts by mass of water-soluble waterproof powder, 0.5 parts by mass of dispersant, 0.5 parts by mass of defoaming agent and 35 parts by mass of cement filler are mixed evenly to obtain a mixed dry powder, and then 35 parts by mass of water are added to the mixed dry powder, and stirred with a mixer for 5-10 minutes to obtain a water-based multifunctional porcelain glaze coating.

[0038] Embodiment 2 The preparation steps of the modified water-soluble resin at least include:

[0039] Put the graphite oxide powder into a beaker, add a deionized water-ethanol mixture, and ultrasonically peel for 30 minutes. Move the graphene oxide dispersion after ultrasonic peeling to a four-necked flask, add the silane coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane to the ethanol solution for thorough mixing, and add it dropwise to the four-necked flask using a constant pressure funnel, and heat to 78° C. and react for 12 hours. After the reaction is completed, filter the product, wash it with acetone for 3-4 times, and vacuum dry the obtained product at 50° C. for 12 hours to obtain silane-modified graphene oxide;

[0040] Hexahydrotoluene diisocyanate was placed in a four-necked flask, and a certain amount of acetone and 0.02% of the total mass of the system as a catalyst dibutyltin dilaurate were added, and the temperature was raised to 40°C, and the above-mentioned silane-modified graphene oxide was added, and the reaction was carried out for 2 hours. Then, the catalyst dibutyltin dilaurate was added dropwise, and the mixture was fully stirred. The mixture was heated to 70°C in an oil bath, and then hydroxyethyl methacrylate was added dropwise to the reactor, and the reaction was carried out for 5 hours to obtain a modifier.

[0041] The solvent is added into the reaction kettle and heated to 90°C. The acrylic monomers AA, BA, MMA, the above-mentioned modifiers and the initiator azobisisobutyronitrile are fully mixed and then dripped into the solvent. The reaction temperature is controlled to be 85-90°C. The dripping is completed within 3 hours. After the dripping is completed, the reaction is kept warm for 4 hours. Under vacuum, part of the solvent in the system is extracted, the temperature is lowered to 60°C, and N,N-dimethylethanolamine is added to the system for neutralization to obtain graphene oxide modified water-soluble acrylic resin.

[0042] The components and preparation steps of the water-soluble waterproof powder are exactly the same as those in Example 1.

[0043] In the preparation steps of the water-based multifunctional porcelain enamel coating, the modified water-soluble resin is replaced by the modified water-soluble resin prepared in this embodiment in equal amounts, and the other components and preparation steps are completely consistent with those in Example 1.

[0044] The preparation steps of the water-soluble waterproof powder of embodiment 3 at least include:

[0045] 8 parts by weight of protective colloid are added with water and stirred until completely dissolved to prepare a protective colloid solution with a solid content of 30-50%, 8 parts by weight of γ-aminopropyltriethoxysilane are added with 10-15 times the weight of water and stirred to obtain a solution, the pH is adjusted to 2-3 with hydrochloric acid, and then the temperature is raised to 40-50° C. for hydrolysis for 5-15 hours to obtain a crosslinking solution, the protective colloid solution is added to the crosslinking solution, and stirred for 5-30 minutes, and finally an anti-caking agent is added to the mixed solution, and stirred for 0.5-2 hours to prepare an emulsion to be spray-dried;

[0046] The spray dryer was set with a spray drying inlet temperature of 150°C, an outlet temperature of 80°C, and a hot air velocity of 4 m / s.3 / min, feeding speed 50ml / min, atomizer speed 20000r / min, and then start the heating system. When the inlet and outlet temperatures rise to the set value, start the feeding system, atomization system and negative pressure system to spray dry the emulsion and collect the water-soluble waterproof powder.

[0047] The components and preparation steps of the modified water-soluble resin are exactly the same as those in Example 1.

[0048] In the preparation steps of the water-based multifunctional porcelain glaze coating, an equal amount of water-soluble waterproof powder is replaced by the water-soluble waterproof powder prepared in this embodiment, and other components and preparation steps are completely consistent with Example 1.

[0049] The preparation steps of the water-based multifunctional enamel coating of embodiment 4 at least include:

[0050] 20 parts by mass of modified water-soluble resin, 15 parts by mass of water-soluble waterproof powder, 0.5 parts by mass of dispersant, 0.5 parts by mass of defoaming agent and 35 parts by mass of cement filler are mixed evenly to obtain a mixed dry powder, and then 30 parts by mass of water are added to the mixed dry powder, and stirred with a mixer for 5-10 minutes to obtain a water-based multifunctional porcelain glaze coating.

[0051] The components and preparation steps of the water-soluble waterproof powder are exactly the same as those in Example 1.

[0052] The components and preparation steps of the modified water-soluble resin are exactly the same as those in Example 1.

[0053] The preparation steps of the water-soluble resin of Comparative Example 1 at least include:

[0054] The solvent is added into the reaction kettle and heated to 90°C. The acrylic monomers AA, BA, MMA and the initiator azobisisobutyronitrile are fully mixed and then dripped into the solvent. The reaction temperature is controlled to be 85-90°C and the dripping is completed within 3 hours. After the dripping is completed, the reaction is kept warm for 4 hours. Under vacuum, part of the solvent in the system is extracted and the temperature is lowered to 60°C. N,N-dimethylethanolamine is added to the system for neutralization to obtain a water-soluble acrylic resin.

[0055] The components and preparation steps of the water-soluble waterproof powder are exactly the same as those in Example 1.

[0056] In the preparation steps of the water-based multifunctional enamel coating, the modified water-soluble resin is replaced by an equal amount of the water-soluble resin prepared in this comparative example, and the other components and preparation steps are completely consistent with Example 1.

[0057] The preparation steps of the water-soluble waterproof powder of Comparative Example 2 at least include:

[0058] 6 parts by mass of protective colloid are added with water and stirred until completely dissolved to prepare a protective colloid solution with a solid content of 30-50%, an anti-caking agent is added, and stirred for 0.5-2 hours to prepare an emulsion to be spray-dried;

[0059] The spray dryer was set with a spray drying inlet temperature of 150°C, an outlet temperature of 80°C, and a hot air velocity of 4 m / s. 3 / min, feeding speed 50ml / min, atomizer speed 20000r / min, and then start the heating system. When the inlet and outlet temperatures rise to the set value, start the feeding system, atomization system and negative pressure system to spray dry the emulsion and collect the water-soluble waterproof powder.

[0060] The components and preparation steps of the modified water-soluble resin are exactly the same as those in Example 1.

[0061] In the preparation steps of the water-based multifunctional porcelain glaze coating, the water-soluble waterproof powder is replaced by an equal amount of the water-soluble waterproof powder prepared in this comparative example, and the other components and preparation steps are completely consistent with Example 1.

[0062] The preparation steps of the water-based multifunctional enamel coating of Comparative Example 3 at least include:

[0063] 15 parts by mass of the water-soluble resin prepared in Comparative Example 1, 15 parts by mass of the water-soluble waterproof powder prepared in Comparative Example 2, 0.5 parts by mass of a dispersant, 0.5 parts by mass of a defoaming agent and 35 parts by mass of a cement filler are mixed uniformly to obtain a mixed dry powder, and then 35 parts by mass of water are added to the mixed dry powder, and stirred with a mixer for 5-10 minutes to obtain a water-based multifunctional porcelain glaze coating.

[0064] Performance Testing

[0065] The water-based multifunctional enamel coatings prepared in Examples 1-4 and Comparative Examples 1-3 were tested according to "Wall Finishing Mortar" (JG / T1024-2019), "Technical Specifications for Safety Appraisal of Engineering Structure Reinforcement Materials" (GB50728-2011) and 9 "Polymer Cement Waterproof Coating" (GB / T23445-2009); the test results are shown in Table 1;

[0066] Table 1: Statistical table of performance test data of examples and comparative examples

[0067]

[0068] As shown in Table 1, the enamel coating prepared in the present application can meet the use of various waterproof and anti-seepage requirements of the substrate, and has improved tensile strength, waterproof and anti-seepage, wear resistance, freeze-thaw resistance, anti-eluviation and stain resistance. In comparative example 1, the wear resistance, freeze-thaw resistance, anti-eluviation and stain resistance decreased significantly, in comparative example 2, the tensile strength and waterproof and anti-seepage performance decreased significantly, and in comparative example 3, various performances decreased significantly, indicating that the water-based multifunctional enamel coating prepared in the present application is widely used, and by adding water-soluble waterproof powder and modified water-soluble resin, the eluviation of the substrate can be inhibited and the anti-freeze-thaw performance of the substrate can be enhanced, as well as the waterproof and anti-seepage performance of the inside and outside of the substrate can be improved.

[0069] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A water-based multifunctional enamel paint, characterized in that: At least the following raw materials are included in parts by weight: Wherein, the water-soluble waterproof powder is a silane-modified protective colloid, and the modified water-soluble resin is a graphene oxide-modified water-soluble acrylic resin.

2. A water-based multifunctional enamel paint according to claim 1, characterized in that: The preparation method of the water-soluble waterproof powder comprises the following steps: The protective colloid is added into water to dissolve to prepare a protective colloid solution with a solid content of 30-50%, and a silane coupling agent is added, stirred for 5-30 minutes, and spray-dried to obtain a water-soluble waterproof powder.

3. A water-based multifunctional enamel paint according to claim 2, characterized in that: The spray drying parameters are set as follows: inlet temperature 120-160°C, outlet temperature 70-110°C, feed rate 1-5kg / h, atomizer speed 20000-30000r / min.

4. A water-based multifunctional enamel paint according to claim 2, characterized in that: The mass ratio of the silane coupling agent to the protective colloid is 1-2:1, and the silane coupling agent is one or more of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-glycidyl ether propylmethyldiethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, vinyltrimethoxysilane and γ-mercaptopropyltrimethoxysilane.

5. A water-based multifunctional enamel paint according to claim 2, characterized in that: The protective colloid is at least one of polyvinyl alcohol, animal glue, gelatin, methyl cellulose, carboxymethyl cellulose, gum arabic or sodium polyacrylate.

6. A water-based multifunctional enamel paint according to claim 1, characterized in that: The preparation method of the graphene oxide modified water-soluble acrylic resin comprises at least the following steps: The graphite oxide powder is added to a deionized water-ethanol mixture, subjected to ultrasonic exfoliation for 30 minutes, a silane coupling agent is added, and the temperature is raised to 70-80° C., and the reaction is performed for 10-15 hours. After the reaction, the product is filtered, washed and dried to obtain silane-modified graphene oxide; Mix isocyanate, acetone and a catalyst, and heat to 40-50° C., add the silane-modified graphene oxide, react for 2-4 hours, then drop the catalyst, stir well and heat to 60-80° C., then drop the hydroxy acrylate monomer, react for 2-6 hours, and obtain a modifier; The acrylic monomer, the modifier and the initiator are fully mixed, and then dripped into a solvent heated to 80-90° C., the reaction temperature is controlled to be 85-90° C., and the dripping is completed within 3-4 hours. After the dripping is completed, the system is kept warm for 1-2 hours, and the initiator is added to the reaction system. After the heat preservation is continued for 2-4 hours, the solvent in the system is extracted under vacuum, the temperature is lowered to 50-60° C., N,N-dimethylethanolamine is added to the system for neutralization, and the end point is when the pH reaches 7-8, thereby obtaining a water-oxidized graphene-modified water-soluble acrylic resin.

7. A water-based multifunctional enamel paint according to claim 6, characterized in that: The hydroxy acrylate monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl methacrylate, and the acrylic acid monomer is one or more of methyl methacrylate, butyl acrylate, or acrylic acid.

8. The water-based multifunctional enamel paint according to claim 1, characterized in that: The filler is at least one of cement, quartz sand, quartz powder, wollastonite powder, calcium carbonate, barium sulfate and river sand.

9. A water-based multifunctional enamel paint according to claim 1, characterized in that: The auxiliary agent is at least one of a defoamer, a dispersant, a wetting agent, a preservative, a thickener or a curing agent.

10. A method for preparing a water-based multifunctional enamel coating as claimed in any one of claims 1 to 9, characterized in that: At least the following steps are included: The modified water-soluble resin, water-soluble waterproof powder, auxiliary agent and filler are mixed evenly to obtain a mixed dry powder, and then water is added to the mixed dry powder and stirred evenly to obtain the water-based multifunctional enamel paint.

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