High-water-resistance wall coating and preparation method thereof

Abstract

The invention discloses a high-water-resistance wall coating and a preparation method thereof, and belongs to the technical field of wall coatings. Single-component modified polysiloxane epoxy resin, polysiloxane, a silane coupling agent KH550, waterborne resin, cerium oxide powder, nano titanium dioxide powder, composite mildew preventive powder, a dispersing agent, a coalescing agent, a defoaming agent, a flatting agent and water are stirred and mixed; the high-water-resistance wall coating is obtained; after the high-water-resistance wall coating disclosed by the invention is coated on an outer wall of a building, the high-water-resistance wall coating has relatively good adhesive force, water resistance and cold and heat cycle resistance, and the added composite mildew preventive powder has relatively good migration resistance; the mould inhibitor IPBC enters the hollow structure of the sulfonated modified silicon dioxide powder in a vacuumizing manner, so that the mould inhibitor IPBC is coated, a slow release effect is achieved, and a layer of zinc nano metal organic framework is generated on the surface, so that the release rate of the mould inhibitor IPBC can be further regulated and controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of wall coatings, and particularly relates to a highly water-resistant wall coating and a preparation method thereof. Background Art

[0002] In construction projects, wall waterproofing and moisture-proofing is a very important task. Exterior wall waterproof coating can effectively prevent rainwater from penetrating into the house, thereby extending its service life.

[0003] Inorganic coating is a kind of coating whose main film-forming substance is inorganic material. Its components usually include inorganic polymers, specially treated metal and metal oxide nanomaterials, and rare earth ultrafine powders. After use, it can form a layer of inorganic polymer anti-corrosion coating with both physical and chemical protection functions on the surface of the building's exterior wall. This anti-corrosion coating is closely connected to the substrate by chemical bonds, ensuring a long service life and reducing the occurrence of problems such as wall shedding and cracking. At the same time, during its production and application process, the pollution to the environment is relatively small, and it is safe and environmentally friendly.

[0004] However, the exterior walls of buildings are affected by natural factors such as wind, rain, and sun exposure, and the mildew inhibitors will migrate and become ineffective. After long-term use, a large number of mildew spots will still appear on the exterior walls, which are difficult to clean, causing trouble for subsequent maintenance. Summary of the invention

[0005] The purpose of the present invention is to provide a highly water-resistant wall coating and a preparation method thereof, and to increase the mildew resistance of the building exterior wall by adding a composite mildew-proofing agent powder to reduce the water resistance and migration resistance of the mildew-proofing agent component.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A method for preparing a highly water-resistant wall coating comprises the following steps: The single-component modified polysilicone epoxy resin, polysiloxane, silane coupling agent KH550, water-based resin, cerium oxide powder, nano titanium dioxide powder, composite mildew-proof agent powder, dispersant, film-forming aid, defoamer, leveling agent and water are stirred and mixed to obtain a highly water-resistant wall coating.

[0007] Furthermore, the mass ratio of the single-component modified polysilicone epoxy resin, polysiloxane, silane coupling agent KH550, water-based resin, cerium oxide powder, nano titanium dioxide powder, composite mildew inhibitor powder, dispersant, film-forming aid, defoaming agent, leveling agent and water is 30-35:20-25:0.2-0.8:5-8:5-8:20-30:0.5-1.5:0.5-1:0.5-1:0.5-1:0.5-1:5-10.

[0008] Furthermore, the composite mildew-proofing agent powder is prepared by the following steps: Step 1: Add monodisperse hollow nano-silica, (3-epoxypropoxy)propyltrimethoxysilane and anhydrous methanol into a reactor and stir to mix, then add polyethyleneimine powder into the reactor, ultrasonically disperse for 30-40 minutes, then stir at 65-70°C for 5-6 hours, centrifuge and filter, wash the filter cake with anhydrous methanol for 3-5 times, and vacuum dry to obtain functionalized silica powder.

[0009] Polyethyleneimine was modified on the surface of monodisperse hollow nano-silica to provide abundant amino groups for functionalized silica powder.

[0010] Step 2: Add sodium m-carboxybenzenesulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, N-hydroxysuccinimide and MES buffer with a MES concentration of 50 mmol / L into a reactor and stir to mix, then adjust the pH value to 5-6 with 4 mol / L hydrochloric acid, stir for 20-30 min at 20-25 ° C, add functionalized silica powder to the reactor, adjust the pH value to 7.5 with 0.1 mol / L sodium hydroxide solution, continue stirring for 10-12 hours, centrifuge and filter, disperse the filter cake in 30-50 times the mass of 0.1 mol / L hydrochloric acid, stir for 8-10 hours at 25-30 ° C, centrifuge and wash 3-5 times, and vacuum dry the filter cake to obtain sulfonated modified silica powder.

[0011] The carboxyl group in sodium m-carboxybenzene sulfonate is used to undergo an amidation reaction with the amino group on the surface of the functionalized silica powder, and then the sodium sulfonate is converted into a sulfonic acid group using hydrochloric acid.

[0012] Step 3: Add sulfonated modified silica powder, mildew inhibitor IPBC, deionized water and anhydrous ethanol into the reactor, stir at 800-1000r / min for 10-15min, ultrasonically disperse for 20-30min, evacuate to -0.09MPa, continue stirring for 1-1.5h, centrifuge and filter, wash the filter cake with anhydrous ethanol 2-3 times, and vacuum dry to obtain mildew inhibitor / nano silica composite powder.

[0013] The modified sulfonated modified silica powder has good adsorption capacity, which helps to combine with the mildew inhibitor IPBC. Then, the mildew inhibitor IPBC is allowed to enter the hollow structure of the sulfonated modified silica powder by vacuuming, thereby encapsulating the mildew inhibitor IPBC and achieving a slow-release effect.

[0014] Step 4: Add the mildew inhibitor / nano-silica composite powder, zinc nitrate hexahydrate and a methanol aqueous solution with a mass dispersion of 80% into a reactor, stir at 300-500 r / min for 20-30 min, then add isophthalic acid, 3-amino-1,2,4-triazole and N,N-dimethylformamide, continue stirring for 5-10 min, stir the reaction at 105-115° C. for 70-75 h, centrifuge and filter, wash the filter cake with anhydrous methanol 2-3 times, and vacuum dry to obtain a composite mildew inhibitor powder.

[0015] The sulfonic acid groups on the surface of the mildew inhibitor / nano-silica composite powder can chelate zinc ions, and the carboxyl groups in isophthalic acid react with zinc ions to form a layer of zinc nano-metal organic skeleton on the surface of the mildew inhibitor / nano-silica composite powder particles, which improves the mildew prevention effect while further regulating the release rate of the mildew inhibitor IPBC and reducing the migration rate of the mildew inhibitor IPBC, thereby improving the mildew prevention effect of the composite mildew inhibitor powder.

[0016] Furthermore, in step 1, the dosage ratio of monodisperse hollow nano-silica, (3-epoxypropoxy)propyltrimethoxysilane, anhydrous methanol and polyethyleneimine powder is 1g:1.1-1.2g:12-15mL:1g.

[0017] Furthermore, in step 2, the usage ratio of sodium carboxybenzenesulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, N-hydroxysuccinimide and MES buffer and functionalized silica powder is 0.3-0.5 g: 0.2-0.3 g: 0.2-0.3 g: 10-15 mL: 0.15-0.25 g.

[0018] Furthermore, in step 3, the usage ratio of sulfonated modified silica powder, mildew inhibitor IPBC, deionized water and anhydrous ethanol is 1g:0.8-1g:40mL:10mL.

[0019] Furthermore, in step 4, the dosage ratio of the mildew inhibitor / nano-silica composite powder, zinc nitrate hexahydrate, isophthalic acid, 3-amino-1,2,4-triazole, methanol aqueous solution and N,N-dimethylformamide is 1g: 5-6g: 1.4-1.6g: 3-3.3g: 10mL: 8-10mL.

[0020] Beneficial effects of the present invention: After being coated on the exterior walls of buildings, the highly water-resistant wall paint of the present invention has good adhesion, water resistance, and resistance to cold and heat cycles, and the added composite mildew-proof agent powder has good migration resistance, which helps to increase the mildew-proof performance of the exterior walls of buildings.

[0021] The composite mildew-proof agent powder of the present invention uses monodisperse hollow nano-silica as a matrix, and polyethyleneimine is modified on the surface of the monodisperse hollow nano-silica to provide abundant amino groups for the functionalized silica powder. The carboxyl groups in sodium m-carboxybenzene sulfonate are used to react with the amino groups on the surface of the functionalized silica powder to undergo amidation reaction, and then the sodium sulfonate is converted into a sulfonic acid group using hydrochloric acid. The modified sulfonated modified silica powder has good adsorption, which is helpful for combining with mildew-proof agent IPBC. The mildew-proof agent IPBC is allowed to enter the sulfonated modified silica powder by vacuuming. The hollow structure of the silica powder can encapsulate the mildew inhibitor IPBC, achieving a sustained release effect; the sulfonic acid groups on the surface of the mildew inhibitor / nano-silica composite powder can chelate zinc ions, and the carboxyl groups in isophthalic acid react with zinc ions to form a layer of zinc nano-metal organic skeleton on the surface of the mildew inhibitor / nano-silica composite powder particles, which improves the mildew inhibitor effect while further regulating the release rate of the mildew inhibitor IPBC and reducing the migration rate of the mildew inhibitor IPBC, thereby improving the mildew inhibitor effect of the composite mildew inhibitor powder. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe 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.

[0023] Embodiment 1: This embodiment provides a highly water-resistant wall coating, which is prepared by the following steps: S1: 10 kg of monodisperse hollow nano-silica, 11 kg of (3-epoxypropyloxy)propyltrimethoxysilane and 120 L of anhydrous methanol were added to a reactor and stirred and mixed. Then 10 kg of polyethyleneimine powder was added to the reactor, ultrasonically dispersed for 30 minutes, and then stirred at 65°C for 5 hours. The filter cake was washed three times with anhydrous methanol and vacuum dried to obtain functionalized silica powder.

[0024] S2: 900g of sodium m-carboxybenzenesulfonate, 600g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, 600g of N-hydroxysuccinimide and 30L of MES buffer with a concentration of 50mmol / L were added to a reactor and stirred and mixed, and then the pH value was adjusted to 5 with 4mol / L hydrochloric acid, and stirred for 20min at 20°C. Then 450g of functionalized silica powder was added to the reactor, and the pH value was adjusted to 7.5 with 0.1mol / L sodium hydroxide solution. Stirring was continued for 10h, centrifugal filtration, and the filter cake was dispersed in 30 times the mass of hydrochloric acid with a molar concentration of 0.1mol / L, stirred at 25°C for 8h, centrifuged and washed 3 times, and the filter cake was vacuum dried to obtain sulfonated modified silica powder.

[0025] S3: Add 400g of sulfonated modified silica powder, 320g of mildew inhibitor IPBC, 16L of deionized water and 4L of anhydrous ethanol into a reactor, stir at 800r / min for 10min, ultrasonically disperse for 20min, evacuate to -0.09MPa, continue stirring for 1h, centrifuge and filter, wash the filter cake twice with anhydrous ethanol, and vacuum dry to obtain a mildew inhibitor / nano-silica composite powder.

[0026] S4: 400 g of antifungal agent / nano-silica composite powder, 2 kg of zinc nitrate hexahydrate and 4 L of methanol aqueous solution with a mass dispersion of 80% were added into a reactor, stirred at 300 r / min for 20 min, then 560 g of isophthalic acid, 1.2 kg of 3-amino-1,2,4-triazole and 3.2 L of N,N-dimethylformamide were added, and stirring was continued for 5 min. The reaction was stirred at 105° C. for 70 h, and centrifuged and filtered. The filter cake was washed twice with anhydrous methanol and vacuum dried to obtain a composite antifungal agent powder.

[0027] S5: 12kg of one-component modified polysilicone epoxy resin, 8kg of polysiloxane, 80g of silane coupling agent KH550, 2kg of water-based resin, 2kg of cerium oxide powder, 8kg of nano titanium dioxide powder, 200g of composite mildewproof agent powder, 200g of dispersant, 200g of film-forming aid, 200g of defoaming agent, 200g of leveling agent and 2kg of water are stirred and mixed to obtain a highly water-resistant wall coating.

[0028] Embodiment 2: This embodiment provides a highly water-resistant wall coating, which is prepared by the following steps: S1: 10 kg of monodisperse hollow nano-silica, 11.5 kg of (3-epoxypropoxy)propyltrimethoxysilane and 135 L of anhydrous methanol were added to a reactor and stirred and mixed. Then 10 kg of polyethyleneimine powder was added to the reactor, ultrasonically dispersed for 35 minutes, and then stirred at 68°C for 5.5 hours. The filter cake was washed with anhydrous methanol for 4 times and vacuum dried to obtain functionalized silica powder.

[0029] S2: 1300g of sodium m-carboxybenzenesulfonate, 750g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, 750g of N-hydroxysuccinimide and 40L of MES buffer with a concentration of 50mmol / L were added to a reactor and stirred and mixed, and then the pH value was adjusted to 5.5 with 4mol / L hydrochloric acid, and stirred at 22°C for 25min. Then 600g of functionalized silica powder was added to the reactor, and the pH value was adjusted to 7.5 with 0.1mol / L sodium hydroxide solution. Stirring was continued for 11h, centrifugal filtration, and the filter cake was dispersed in 40 times the mass of hydrochloric acid with a molar concentration of 0.1mol / L, stirred at 28°C for 9h, centrifuged and washed 4 times, and the filter cake was vacuum dried to obtain sulfonated modified silica powder.

[0030] S3: Add 400g of sulfonated modified silica powder, 360g of mildew inhibitor IPBC, 16L of deionized water and 4L of anhydrous ethanol into the reactor, stir at 900r / min for 12min, ultrasonically disperse for 25min, evacuate to -0.09MPa, continue stirring for 1.2h, centrifuge and filter, wash the filter cake twice with anhydrous ethanol, and vacuum dry to obtain mildew inhibitor / nano-silica composite powder.

[0031] S4: 400 g of antifungal agent / nano-silica composite powder, 2.2 kg of zinc nitrate hexahydrate and 4 L of methanol aqueous solution with a mass dispersion of 80% were added into a reactor, stirred at 400 r / min for 25 min, then 600 g of isophthalic acid, 1.25 kg of 3-amino-1,2,4-triazole and 3.6 L of N,N-dimethylformamide were added, and stirring was continued for 8 min. The reaction was stirred at 110° C. for 72 h, and centrifuged and filtered. The filter cake was washed twice with anhydrous methanol and vacuum dried to obtain a composite antifungal agent powder.

[0032] S5: 13 kg of one-component modified polysilicone epoxy resin, 9 kg of polysiloxane, 150 g of silane coupling agent KH550, 3 kg of water-based resin, 2.5 kg of cerium oxide powder, 10 kg of nano titanium dioxide powder, 400 g of composite mildewproof agent powder, 300 g of dispersant, 300 g of film-forming aid, 300 g of defoaming agent, 300 g of leveling agent and 3 kg of water are stirred and mixed to obtain a highly water-resistant wall coating.

[0033] Embodiment 3: This embodiment provides a highly water-resistant wall coating, which is prepared by the following steps: S1: 10 kg of monodisperse hollow nano-silica, 12 kg of (3-epoxypropyloxy)propyltrimethoxysilane and 150 L of anhydrous methanol were added to a reactor and stirred and mixed. Then 10 kg of polyethyleneimine powder was added to the reactor, ultrasonically dispersed for 40 minutes, and then stirred at 70°C for 5-6 hours. The filter cake was washed with anhydrous methanol for 5 times and vacuum dried to obtain functionalized silica powder.

[0034] S2: 1500g of sodium m-carboxybenzenesulfonate, 900g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, 900g of N-hydroxysuccinimide and 45L of MES buffer with a concentration of 50mmol / L were added to a reactor and stirred and mixed, and then the pH value was adjusted to 6 with 4mol / L hydrochloric acid, and stirred at 25°C for 30min. Then 750g of functionalized silica powder was added to the reactor, and the pH value was adjusted to 7.5 with 0.1mol / L sodium hydroxide solution. Stirring was continued for 12h, centrifugal filtration, and the filter cake was dispersed in 50 times the mass of hydrochloric acid with a molar concentration of 0.1mol / L, stirred at 30°C for 10h, centrifuged and washed 5 times, and the filter cake was vacuum dried to obtain sulfonated modified silica powder.

[0035] S3: Add 400g of sulfonated modified silica powder, 400g of mildew inhibitor IPBC, 16L of deionized water and 4L of anhydrous ethanol into the reactor, stir at 1000r / min for 15min, ultrasonically disperse for 30min, evacuate to -0.09MPa, continue stirring for 1.5h, centrifuge and filter, wash the filter cake with anhydrous ethanol 3 times, and vacuum dry to obtain mildew inhibitor / nano-silica composite powder.

[0036] S4: 400 g of antifungal agent / nano-silica composite powder, 2.4 kg of zinc nitrate hexahydrate and 4 L of methanol aqueous solution with a mass dispersion of 80% were added into a reactor, stirred at 500 r / min for 30 min, then 640 g of isophthalic acid, 1.32 kg of 3-amino-1,2,4-triazole and 4 L of N,N-dimethylformamide were added, and stirring was continued for 10 min. The reaction was stirred at 115° C. for 75 h, and centrifuged and filtered. The filter cake was washed 3 times with anhydrous methanol and dried in vacuo to obtain a composite antifungal agent powder.

[0037] S5: 14 kg of one-component modified polysilicone epoxy resin, 10 kg of polysiloxane, 320 g of silane coupling agent KH550, 3.2 kg of water-based resin, 3.2 kg of cerium oxide powder, 12 kg of nano titanium dioxide powder, 600 g of composite mildewproof agent powder, 400 g of dispersant, 400 g of film-forming aid, 400 g of defoamer, 400 g of leveling agent and 4 kg of water are stirred and mixed to obtain a highly water-resistant wall coating.

[0038] Embodiment 4: This embodiment provides a highly water-resistant wall coating, which is prepared by the following steps: S1: 10 kg of monodisperse hollow nano-silica, 12 kg of (3-epoxypropyloxy)propyltrimethoxysilane and 150 L of anhydrous methanol were added to a reactor and stirred and mixed. Then 10 kg of polyethyleneimine powder was added to the reactor, ultrasonically dispersed for 40 minutes, and then stirred at 70°C for 5-6 hours. The filter cake was washed with anhydrous methanol for 5 times and vacuum dried to obtain functionalized silica powder.

[0039] S2: 1500g of sodium m-carboxybenzenesulfonate, 900g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, 900g of N-hydroxysuccinimide and 45L of MES buffer with a concentration of 50mmol / L were added to a reactor and stirred and mixed, and then the pH value was adjusted to 6 with 4mol / L hydrochloric acid, and stirred at 25°C for 30min. Then 750g of functionalized silica powder was added to the reactor, and the pH value was adjusted to 7.5 with 0.1mol / L sodium hydroxide solution. Stirring was continued for 12h, centrifugal filtration, and the filter cake was dispersed in 50 times the mass of hydrochloric acid with a molar concentration of 0.1mol / L, stirred at 30°C for 10h, centrifuged and washed 5 times, and the filter cake was vacuum dried to obtain sulfonated modified silica powder.

[0040] S3: Add 400g of sulfonated modified silica powder, 400g of mildew inhibitor IPBC, 16L of deionized water and 4L of anhydrous ethanol into the reactor, stir at 1000r / min for 15min, ultrasonically disperse for 30min, evacuate to -0.09MPa, continue stirring for 1.5h, centrifuge and filter, wash the filter cake with anhydrous ethanol 3 times, and vacuum dry to obtain mildew inhibitor / nano-silica composite powder.

[0041] S4: 400 g of antifungal agent / nano-silica composite powder, 2.4 kg of zinc nitrate hexahydrate and 4 L of methanol aqueous solution with a mass dispersion of 80% were added into a reactor, stirred at 500 r / min for 30 min, then 640 g of isophthalic acid, 1.32 kg of 3-amino-1,2,4-triazole and 4 L of N,N-dimethylformamide were added, and stirring was continued for 10 min. The reaction was stirred at 115° C. for 75 h, and centrifuged and filtered. The filter cake was washed 3 times with anhydrous methanol and dried in vacuo to obtain a composite antifungal agent powder.

[0042] S5: 12kg of one-component modified polysilicone epoxy resin, 8kg of polysiloxane, 80g of silane coupling agent KH550, 2kg of water-based resin, 2kg of cerium oxide powder, 8kg of nano titanium dioxide powder, 200g of composite mildewproof agent powder, 200g of dispersant, 200g of film-forming aid, 200g of defoaming agent, 200g of leveling agent and 2kg of water are stirred and mixed to obtain a highly water-resistant wall coating.

[0043] In the embodiment, the one-component modified polysilicone epoxy resin was purchased from Hubei Bast Technology Co., Ltd. with the brand name BS5188; the water-based resin was purchased from Nanjing Chuhai New Material Technology Co., Ltd. with the brand name MP50E; the dispersant was sodium dodecyl sulfonate; the film-forming aid was dodecyl alcohol ester, purchased from Shandong Jinyufeng New Materials Co., Ltd.; the defoamer was BYK025, and the leveling agent was BYK333.

[0044] Comparative Example 1: Based on Example 3, the sulfonated modified silica powder in step S3 is directly replaced by monodisperse hollow nano-silica without the treatment in step S1 and step S2, and the subsequent steps remain unchanged to prepare a highly water-resistant wall coating.

[0045] Comparative Example 2: Based on Example 3, step S4 is not performed and the other steps remain unchanged to prepare a highly water-resistant wall coating.

[0046] Performance tests were performed on Examples 1 to 4 and Comparative Examples 1 to 2. Different highly water-resistant wall coatings were applied to the surface of cement boards. The coating thickness remained the same. After the coating film was dried and cured, different samples were obtained. The adhesion of the paint films of different samples was detected with reference to GB / T 9286-2021. The samples were immersed in water at 23°C for 20 hours, then frozen at -50°C for 2 hours, and dried at 180°C for 2 hours. The cycle was repeated 3 times. After the cycle test, the surface of the samples was observed for powdering, cracking, blistering, peeling, etc. If not, fill in "normal". The mildew resistance level of the paint film before and after the cycle test was tested with reference to GB / T 1741-2020. The performance test results of each highly water-resistant wall coating sample are shown in the following table: Table 1 Performance test results of various high water-resistant wall coating samples It can be seen from Table 1 that the paint films of the highly water-resistant wall coatings in the embodiments and comparative examples have good adhesion and water resistance, and resistance to cold and hot cycles. However, the samples in the embodiments have good mildew resistance levels before and after the cycle test, and the mildew resistance level in Comparative Example 1 deteriorates after the cycle test. The surface of the monodisperse hollow nano-silica that has not been sulfonated cannot chelate zinc ions, and it is difficult to attach enough zinc nano-metal organic skeletons on the surface. Combined with the analysis of Comparative Example 2, a layer of zinc nano-metal organic skeleton is generated on the surface of the mildewcide / nano-silica composite powder particles, which can reduce the migration rate of the mildewcide IPBC, thereby improving the mildew resistance effect of the composite mildewcide powder.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a highly water-resistant wall coating, characterized in that: The steps include: The single-component modified polysilicon epoxy resin, polysiloxane, silane coupling agent KH550, water-based resin, cerium oxide powder, nano titanium dioxide powder, composite mildew-proof agent powder, dispersant, film-forming aid, defoamer, leveling agent and water are stirred and mixed to obtain a highly water-resistant wall coating; The composite mildew-proofing agent powder is prepared by the following steps: Add the mildew inhibitor / nano-silicon dioxide composite powder, zinc nitrate hexahydrate and a methanol aqueous solution with a mass dispersion of 80% into a reactor, stir for 20-30 minutes at 300-500 r / min, then add isophthalic acid, 3-amino-1,2,4-triazole and N,N-dimethylformamide, continue stirring for 5-10 minutes, stir the reaction at 105-115° C. for 70-75 hours, centrifuge and filter, wash the filter cake with anhydrous methanol for 2-3 times, and vacuum dry to obtain a composite mildew inhibitor powder.

2. The method for preparing a highly water-resistant wall coating according to claim 1, characterized in that: The mass ratio of the one-component modified polysilicone epoxy resin, polysiloxane, silane coupling agent KH550, water-based resin, cerium oxide powder, nano titanium dioxide powder, composite mildew preventer powder, dispersant, film-forming aid, defoamer, leveling agent and water is 30-35:20-25:0.2-0.8:5-8:5-8:20-30:0.5-1.5:0.5-1:0.5-1:0.5-1:0.5-1:5-10.

3. The method for preparing a highly water-resistant wall coating according to claim 1, characterized in that: The dosage ratio of the antifungal agent / nano silicon dioxide composite powder, zinc nitrate hexahydrate, isophthalic acid, 3-amino-1,2,4-triazole, methanol aqueous solution and N,N-dimethylformamide is 1g:5-6g: 1.4-1.6g: 3-3.3g: 10mL: 8-10mL.

4. The method for preparing a highly water-resistant wall coating according to claim 1, characterized in that: The antifungal agent / nano silicon dioxide composite powder is prepared by the following steps: Add sulfonated modified silica powder, mildew inhibitor IPBC, deionized water and anhydrous ethanol into a reactor, stir at 800-1000 r / min for 10-15 min, ultrasonically disperse for 20-30 min, evacuate to -0.09 MPa, continue stirring for 1-1.5 h, centrifuge and filter, wash the filter cake with anhydrous ethanol for 2-3 times, and vacuum dry to obtain mildew inhibitor / nano silica composite powder.

5. The method for preparing a highly water-resistant wall coating according to claim 4, characterized in that: The dosage ratio of the sulfonated modified silicon dioxide powder, the mildew inhibitor IPBC, deionized water and anhydrous ethanol is 1g:0.8-1g:40mL:10mL.

6. The method for preparing a highly water-resistant wall coating according to claim 4, characterized in that: The sulfonated modified silicon dioxide powder is prepared by the following steps: Sodium m-carboxybenzenesulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, N-hydroxysuccinimide and MES buffer with a MES concentration of 50 mmol / L are added to a reactor and stirred and mixed, and then the pH value is adjusted to 5-6 with hydrochloric acid with a concentration of 4 mol / L, and stirred at 20-25° C. for 20-30 minutes, and then functionalized silica powder is added, and the pH value is adjusted to 7.5 with a sodium hydroxide solution with a concentration of 0.1 mol / L, and the stirring is continued for 10-12 hours, and the filter cake is dispersed in 30-50 times the mass of hydrochloric acid with a concentration of 0.1 mol / L, and stirred at 25-30° C. for 8-10 hours, and centrifuged and washed 3-5 times, and the filter cake is vacuum dried to obtain sulfonated modified silica powder.

7. The method for preparing a highly water-resistant wall coating according to claim 6, characterized in that: The dosage ratio of the sodium m-carboxybenzenesulfonate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, N-hydroxysuccinimide and MES buffer and functionalized silica powder is 0.3-0.5 g: 0.2-0.3 g: 0.2-0.3 g: 10-15 mL: 0.15-0.25 g.

8. The method for preparing a highly water-resistant wall coating according to claim 6, characterized in that: The functionalized silica powder is prepared by the following steps: Monodisperse hollow nano-silica, (3-epoxypropoxy)propyltrimethoxysilane and anhydrous methanol are added into a reaction kettle and stirred and mixed, polyethyleneimine powder is then added into the reaction kettle, ultrasonically dispersed for 30-40 minutes, then stirred at 65-70° C. for 5-6 hours, centrifuged and filtered, the filter cake is washed with anhydrous methanol for 3-5 times, and vacuum dried to obtain functionalized silica powder.

9. The method for preparing a highly water-resistant wall coating according to claim 8, characterized in that: The dosage ratio of the monodisperse hollow nano-silica, (3-epoxypropoxy)propyltrimethoxysilane, anhydrous methanol and polyethyleneimine powder is 1g:1.1-1.2g:12-15mL:1g.

10. A highly water-resistant wall coating, characterized in that: The invention is prepared by the preparation method of a highly water-resistant wall coating as described in any one of claims 1 to 9.

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