A nano-protective coating based on water-based paint and its production process

Abstract

This invention relates to the field of protective coating preparation technology, specifically to a nano-protective coating based on water-based paint and its production process. The coating comprises the following components by weight: 50-60 parts water-based polyurethane resin, 10-20 parts fluorocarbon-modified polysiloxane, 14-23 parts modified nanofiller composition, 3-5 parts ammonium polyphosphate, 10-12 parts water-based fluorocarbon emulsion, 1-3 parts silane coupling agent, 1-2 parts dispersant, 2-4 parts film-forming aid, 1-2 parts thickener, 0.5-1 part defoamer, 10-15 parts co-solvent, and 20-40 parts deionized water. By selecting specific types and amounts of raw materials, this invention produces a nano-protective coating with excellent waterproof and fireproof properties, as well as strong adhesion, environmental friendliness, and high hardness. It is suitable for most coating application scenarios and has significant economic prospects.

Description

Technical Field

[0001] This invention relates to the field of protective coating preparation technology, specifically to a water-based paint-based nano-protective coating and its production process. Background Technology

[0002] With the improvement of infrastructure, the booming development of the construction industry and other fields, and the rapid growth of industrial production, the use of coatings has shown a significant upward trend. Traditional coatings mainly use organic matter as a dispersion medium, and the released volatile organic compounds (VOCs), especially formaldehyde and aromatic hydrocarbons, have a serious impact on human health. In recent years, people's environmental awareness has gradually increased, and the laws and regulations related to the production and use of chemical products have become increasingly stringent. Water-based coatings, with their advantages of being green, environmentally friendly, and low-carbon, have gained favor with consumers and are gradually replacing the dominant position of traditional coatings, representing an important direction for the development of coatings today. Water-based coatings refer to coatings that use water as a solvent or dispersion medium. Compared with traditional organic solvent-based coatings, water-based coatings can reduce the emission of volatile organic compounds, save resources and energy, and are also convenient for storage and transportation. Although water-based coatings have environmental advantages, their technical limitations are still significant. First, the hydrophilic properties of the film-forming substances in the basic formulation lead to insufficient water resistance of the coating, making it prone to permeation and peeling or blistering in long-term humid environments, and its waterproof performance is significantly lower than that of traditional solvent-based coatings. Secondly, the lack of efficient fire protection system design means that the fire resistance and smoke suppression properties of existing water-based coatings are insufficient to meet the requirements of building fire protection codes. The poor compatibility of fire retardant additives with water-based systems further exacerbates the deficiencies in fire protection performance. In addition, traditional defects such as slow drying rate (approximately 30% longer than solvent-based coatings) and low mechanical strength have not been completely overcome, directly affecting construction efficiency and coating durability.

[0003] Therefore, developing a nano-protective coating that can overcome the shortcomings of water-based coatings is not only of great environmental significance, but also of high economic value.

[0004] To overcome the shortcomings of existing technologies, the present invention aims to provide a water-based paint-based nano-protective coating and its production process. The coating comprises the following components by weight: 50-60 parts water-based polyurethane resin, 10-20 parts fluorocarbon-modified polysiloxane, 14-23 parts modified nanofiller composition, 3-5 parts ammonium polyphosphate, 10-12 parts water-based fluorocarbon emulsion, 1-3 parts silane coupling agent, 1-2 parts dispersant, 2-4 parts film-forming aid, 1-2 parts thickener, 0.5-1 part defoamer, 10-15 parts co-solvent, and 20-40 parts deionized water. By selecting specific types and amounts of raw materials, the present invention produces a nano-protective coating with excellent waterproof and fireproof properties, as well as strong adhesion, environmental friendliness, and high hardness. It is applicable to most coating application scenarios and has significant economic prospects.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A nano-protective coating based on water-based paint comprises the following components by weight: 50-60 parts water-based polyurethane resin, 10-20 parts fluorocarbon modified polysiloxane, 14-23 parts modified nanofiller composition, 3-5 parts ammonium polyphosphate, 10-12 parts water-based fluorocarbon emulsion, 1-3 parts silane coupling agent, 1-2 parts dispersant, 2-4 parts film-forming aid, 1-2 parts thickener, 0.5-1 part defoamer, 10-15 parts cosolvent, and 20-40 parts deionized water.

[0007] Preferably, the modified nanofiller composition is a mixture of nano-silica, nano-alumina, and nano-aluminum hydroxide in a mass ratio of 5:3:2.

[0008] Preferably, the modified nanofiller composition is prepared by the following steps:

[0009] S11. Weigh out the corresponding masses of nano-silica, nano-alumina, and nano-aluminum hydroxide according to the proportion, and activate them by treating them at 180-200℃ for 2-3 hours.

[0010] S12. Mix the silane coupling agent with an aqueous ethanol solution of 30-40% in a certain proportion to prepare a grafting treatment solution;

[0011] S13. The activated nano-silica, nano-alumina and nano-aluminum hydroxide are sequentially immersed in the grafting solution, stirred at 80-90℃ for 3-4 hours, centrifuged, washed and dried to obtain the pre-modified nanofiller composition.

[0012] S14. The pre-modified nanofiller composition is mixed with 1-2% triethyl phosphate and stirred at 60-70°C for 1-2 hours to obtain the modified nanofiller composition.

[0013] Preferably, in step S12, the ratio of the silane coupling agent to the ethanol aqueous solution is 2-3:90-100; and the pH of the grafting treatment solution is controlled at 4-5.

[0014] Preferably, in step S12, the silane coupling agent is selected from one or more of γ-aminopropyltriethoxysilane and γ-methacryloyloxypropyltrimethoxysilane.

[0015] Preferably, the fluorocarbon-modified polysiloxane is prepared by the following steps:

[0016] S21. Dissolve 10-15 parts by weight of (3,3,3-trifluoropropyl)methyldichlorosilane in 50-60 parts by weight of toluene, and hydrolyze at 40-100℃ for 2-4 hours to generate a fluorinated hydrolyzed homopolymer.

[0017] S22. Add 8-9 parts of octamethylcyclotetrasiloxane, 1-2 parts of methyltrifluoropropylcyclotrisiloxane, 0.3-0.5 parts of hexamethyldisiloxane and 0.01-0.1 parts of p-toluenesulfonic acid sequentially to the fluorinated hydrolyzed homopolymer, and polymerize at 60-120℃ for 6-12 hours to finally obtain fluorocarbon modified polysiloxane.

[0018] Preferably, the dispersant is a polyacrylate dispersant; the thickener is a polyurethane associative thickener; and the defoamer is an organosilicon defoamer.

[0019] Preferably, the co-solvent is selected from one or more of propylene glycol, ethylene glycol butyl ether, and dipropylene glycol methyl ether; the film-forming aid is selected from one or more of propylene glycol phenyl ether and dodecyl alcohol ester.

[0020] A production process for a water-based paint-based nano-protective coating, comprising the following steps:

[0021] S1. Mix waterborne polyurethane resin, fluorocarbon modified polysiloxane, modified nanofiller composition, ammonium polyphosphate and silane coupling agent in proportion, heat to 60-80℃ and stir for 2-3 hours, cool to room temperature to obtain primary coating.

[0022] S2. Add water-based fluorocarbon emulsion, dispersant, film-forming aid, thickener, defoamer, cosolvent, and deionized water to the primary coating in proportion. Heat to 80-100℃ and stir for 1-2 hours. Cool to room temperature to obtain the nano-protective coating based on water-based paint.

[0023] Preferably, the silane coupling agent is selected from one or more of γ-aminopropyltriethoxysilane and γ-methacryloyloxypropyltrimethoxysilane.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. This invention constructs a functional composite waterborne coating system through multi-component synergy. With organic-inorganic hybrid technology as the core, it systematically solves the problem of balancing mechanical properties and functionality. The film-forming system uses waterborne polyurethane resin and fluorocarbon modified polysiloxane to form a dynamic cross-linking network through the bonding of urethane groups and siloxane segments. Combined with gradient fluorine modification design, it simultaneously improves mechanical strength and hydrophobic anti-corrosion performance.

[0026] 2. The modified nanofiller composition, through triethyl phosphate surface grafting technology and directional crosslinking with silane coupling agent, can achieve nanoscale dispersion and reinforcement, and form a dense composite three-dimensional skeleton structure in the resin matrix, thereby greatly reducing the wear rate and significantly improving the adhesion of the coating; in a fire environment, ammonium polyphosphate and nano Al(OH)3 in the modified nanofiller composition can jointly catalyze the cracking of fluorocarbon modified polysiloxane to generate a Si-F / POF flame retardant network;

[0027] 3. The short CF chains of waterborne fluorocarbon emulsions can spontaneously migrate to the coating surface through entropy-driven migration, forming a dense hydrophobic layer with the long fluoroalkane side chains of fluorocarbon-modified polysiloxanes, reducing the surface energy of the coating, and thus achieving self-cleaning function through the lotus leaf effect. Attached Figure Description

[0028] Figure 1 This is a flow chart of the preparation process of the nano-protective coating based on water-based paint described in this invention;

[0029] Figure 2 This is a flow chart illustrating the preparation process of the modified nanofiller composition described in this invention.

[0030] Figure 3 This is a process flow diagram for preparing the fluorocarbon-modified polysiloxane described in this invention.

[0031] Figure 4 The images show the adhesion test results of Examples 1, 2 and Comparative Example 3 of the present invention, where (a) is Example 1, (b) is Example 2 and (c) is Comparative Example 3. Detailed Implementation

[0032] The present invention will now be clearly and completely described in conjunction with embodiments thereof. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-4 The present invention provides a technical solution:

[0034] Example 1: A production process for a nano-protective coating based on water-based paint:

[0035] S1. Mix waterborne polyurethane resin, fluorocarbon modified polysiloxane, modified nanofiller composition, ammonium polyphosphate and silane coupling agent in proportion, heat to 75°C and stir for 2.5 hours, cool to room temperature to obtain primary coating.

[0036] S2. Add water-based fluorocarbon emulsion, dispersant, film-forming aid, thickener, defoamer, cosolvent, and deionized water to the primary coating in proportion. Heat to 100°C and stir for 1 hour. Cool to room temperature to obtain the nano-protective coating based on water-based paint.

[0037] In the above process, the amounts of each component used according to their mass parts are as follows (one unit mass part is defined as 50g):

[0038]

[0039] The grade of the waterborne polyurethane resin is HYDRAN AP-30F;

[0040] The aqueous fluorocarbon emulsion is model FX-970;

[0041] The silane coupling agent is γ-aminopropyltriethoxysilane;

[0042] The dispersant is a polyacrylate dispersant, specifically lithium polyacrylate;

[0043] The film-forming aid is propylene glycol phenyl ether;

[0044] The thickener is a polyurethane associative thickener, specifically RM-2020;

[0045] The defoamer is an organosilicon defoamer, specifically DC-200;

[0046] The co-solvent is propylene glycol;

[0047] In the above process, the modified nanofiller composition is a mixture of nano silica, nano alumina, and nano aluminum hydroxide in a mass ratio of 5:3:2;

[0048] The modified nanofiller composition is prepared by the following steps:

[0049] S11. Weigh out 5 parts of nano-silica, 3 parts of nano-alumina, and 2 parts of nano-aluminum hydroxide by mass, and activate them by treating them at 180℃ for 2 hours.

[0050] S12. Mix 2 parts of γ-aminopropyltriethoxysilane with 90 parts of 30% aqueous ethanol solution to prepare a grafting treatment solution, and control the pH of the grafting treatment solution to 4.

[0051] S13. The activated nano-silica, nano-alumina and nano-aluminum hydroxide were sequentially immersed in the grafting solution, stirred at 80°C for 3 hours, centrifuged, washed and dried to obtain the pre-modified nanofiller composition.

[0052] S14. The pre-modified nanofiller composition is mixed with 1% triethyl phosphate and stirred at 60°C for 1 hour to obtain the modified nanofiller composition. The above steps are repeated cyclically to prepare a large quantity of the modified nanofiller composition, and 21 parts are used for the preparation of the nano-protective coating.

[0053] In the above process, the fluorocarbon-modified polysiloxane is prepared through the following steps:

[0054] S21. Dissolve 13 parts of (3,3,3-trifluoropropyl)methyldichlorosilane in 55 parts of toluene and hydrolyze at 60°C for 2 hours to generate a fluorine-containing hydrolyzed homopolymer.

[0055] S22. Add 8 parts of octamethylcyclotetrasiloxane, 1 part of methyltrifluoropropylcyclotrisiloxane, 0.5 parts of hexamethyldisiloxane and 0.07 parts of p-toluenesulfonic acid sequentially to the fluorinated hydrolyzed homopolymer, and polymerize at 80°C for 10 h to finally obtain fluorocarbon modified polysiloxane.

[0056] Example 2: A production process for a nano-protective coating based on water-based paint:

[0057] S1. Mix waterborne polyurethane resin, fluorocarbon modified polysiloxane, modified nanofiller composition, ammonium polyphosphate and silane coupling agent in proportion, heat to 65°C and stir for 2 hours, cool to room temperature to obtain primary coating.

[0058] S2. Add water-based fluorocarbon emulsion, dispersant, film-forming aid, thickener, defoamer, cosolvent, and deionized water to the primary coating in proportion. Heat to 80°C and stir for 1 hour. Cool to room temperature to obtain the nano-protective coating based on water-based paint.

[0059] In the above process, the amounts of each component used according to their mass parts are as follows (one unit mass part is defined as 50g):

[0060]

[0061] The grade of the waterborne polyurethane resin is HYDRAN AP-30F;

[0062] The aqueous fluorocarbon emulsion is model FX-970;

[0063] The silane coupling agent is γ-aminopropyltriethoxysilane;

[0064] The dispersant is a polyacrylate dispersant, specifically lithium polyacrylate;

[0065] The film-forming aid is propylene glycol phenyl ether;

[0066] The thickener is a polyurethane associative thickener, specifically RM-2020;

[0067] The defoamer is an organosilicon defoamer, specifically DC-200;

[0068] The co-solvent is propylene glycol;

[0069] In the above process, the modified nanofiller composition is a mixture of nano silica, nano alumina, and nano aluminum hydroxide in a mass ratio of 5:3:2;

[0070] The modified nanofiller composition is prepared by the following steps:

[0071] S11. Weigh out 5 parts of nano-silica, 3 parts of nano-alumina, and 2 parts of nano-aluminum hydroxide by weight, and activate them at 200℃ for 2 hours.

[0072] S12. Mix 2 parts of γ-aminopropyltriethoxysilane with 90 parts of 30% aqueous ethanol solution to prepare a grafting treatment solution. The pH of the grafting treatment solution is controlled at 4.4.

[0073] S13. The activated nano-silica, nano-alumina and nano-aluminum hydroxide were sequentially immersed in the grafting solution, stirred at 90°C for 3 hours, centrifuged, washed and dried to obtain the pre-modified nanofiller composition.

[0074] S14. The pre-modified nanofiller composition is mixed with 2% triethyl phosphate and stirred at 70°C for 1 hour to obtain the modified nanofiller composition. The above steps are repeated cyclically to prepare a large quantity of the modified nanofiller composition, and 15 parts are used for the preparation of the nano-protective coating.

[0075] In the above process, the fluorocarbon-modified polysiloxane is prepared through the following steps:

[0076] S21. Dissolve 10 parts of (3,3,3-trifluoropropyl)methyldichlorosilane in 50 parts of toluene and hydrolyze at 50°C for 2 hours to generate a fluorinated hydrolyzed homopolymer.

[0077] S22. Add 8 parts of octamethylcyclotetrasiloxane, 1 part of methyltrifluoropropylcyclotrisiloxane, 0.3 parts of hexamethyldisiloxane and 0.05 parts of p-toluenesulfonic acid sequentially to the fluorinated hydrolyzed homopolymer, and polymerize at 60°C for 6 hours to finally obtain fluorocarbon modified polysiloxane.

[0078] Example 3: A production process for a nano-protective coating based on water-based paint:

[0079] S1. Mix waterborne polyurethane resin, fluorocarbon modified polysiloxane, modified nanofiller composition, ammonium polyphosphate and silane coupling agent in proportion, heat to 70°C and stir for 2 hours, cool to room temperature to obtain primary coating.

[0080] S2. Add water-based fluorocarbon emulsion, dispersant, film-forming aid, thickener, defoamer, cosolvent, and deionized water to the primary coating in proportion. Heat to 90°C and stir for 1 hour. Cool to room temperature to obtain the nano-protective coating based on water-based paint.

[0081] In the above process, the amounts of each component used according to their mass parts are as follows (one unit mass part is defined as 50g):

[0082]

[0083] The grade of the waterborne polyurethane resin is HYDRAN AP-30F;

[0084] The aqueous fluorocarbon emulsion is model FX-970;

[0085] The silane coupling agent is γ-methacryloxypropyltrimethoxysilane;

[0086] The dispersant is a polyacrylate dispersant, specifically lithium polyacrylate;

[0087] The film-forming aid is propylene glycol phenyl ether;

[0088] The thickener is a polyurethane associative thickener, specifically RM-2020;

[0089] The defoamer is an organosilicon defoamer, specifically DC-200;

[0090] The co-solvent is propylene glycol;

[0091] In the above process, the modified nanofiller composition is a mixture of nano silica, nano alumina, and nano aluminum hydroxide in a mass ratio of 5:3:2;

[0092] The modified nanofiller composition is prepared by the following steps:

[0093] S11. Weigh out 5 parts of nano-silica, 3 parts of nano-alumina, and 2 parts of nano-aluminum hydroxide by mass, and activate them at 190℃ for 2 hours.

[0094] S12. Mix 3 parts of γ-aminopropyltriethoxysilane with 100 parts of 35% aqueous ethanol solution to prepare a grafting treatment solution. The pH of the grafting treatment solution is controlled at 4.4.

[0095] S13. The activated nano-silica, nano-alumina and nano-aluminum hydroxide were sequentially immersed in the grafting solution, stirred at 90°C for 3 hours, centrifuged, washed and dried to obtain the pre-modified nanofiller composition.

[0096] S14. The pre-modified nanofiller composition is mixed with 2% triethyl phosphate and stirred at 70°C for 1 hour to obtain the modified nanofiller composition. The above steps are repeated cyclically to prepare a large quantity of the modified nanofiller composition, and 12 parts are used for the preparation of the nano-protective coating.

[0097] In the above process, the fluorocarbon-modified polysiloxane is prepared through the following steps:

[0098] S21. Dissolve 13 parts of (3,3,3-trifluoropropyl)methyldichlorosilane in 60 parts of toluene and hydrolyze at 70°C for 2 hours to generate a fluorinated hydrolyzed homopolymer.

[0099] S22. Add 9 parts of octamethylcyclotetrasiloxane, 1 part of methyltrifluoropropylcyclotrisiloxane, 0.5 parts of hexamethyldisiloxane and 0.1 parts of p-toluenesulfonic acid sequentially to the fluorinated hydrolyzed homopolymer, and polymerize at 100°C for 8 hours to finally obtain fluorocarbon modified polysiloxane.

[0100] Comparative Example 1: The only difference between Comparative Example 1 and Example 1 is that the fluorocarbon-modified polysiloxane component present in the original coating formulation of Example 1 was removed in Comparative Example 1. The remaining steps are exactly the same in Comparative Example 1 and Example 1.

[0101] Comparative Example 2: The only difference between Comparative Example 2 and Example 1 is that the modified nanofiller composition component present in the original coating formulation of Example 1 was omitted in Comparative Example 2. The remaining steps are exactly the same in Comparative Example 2 and Example 1.

[0102] Comparative Example 3: The only difference between Comparative Example 3 and Example 1 is that the fluorocarbon modified polysiloxane and modified nanofiller composition components present in the original coating formulation of Example 1 were omitted in Comparative Example 3. The remaining steps are exactly the same in Comparative Example 3 and Example 1.

[0103] Performance Testing: The adhesion, hardness, impact resistance, acid and alkali resistance, and durability of the prepared water-based paint-based nano-protective coating were tested according to GB / T 9286-2021, GB / T 1732-2020, GB / T 9274-1988, GB / T 1771-2007, and GB / T 6739-2006 standards. The test results are shown below:

[0104] Table 1. Summary of Performance Test Data for Protective Coatings

[0105]

[0106] Referring to the test data in Table 1, the adhesion of the nano-protective coating based on water-based paint provided by this invention is significantly better than that of Comparative Examples 1-3. This indicates that the fluorocarbon-modified polysiloxane and modified nanofiller enhance the interfacial bonding between the coating and the substrate through chemical bonding (Si-O-Si / urethane). Comparative Example 1 lacks the hydrophobic interfacial effect of the fluorocarbon chain, resulting in slight edge detachment. In Comparative Examples 2 and 3, the absence of nanofiller directly leads to a decrease in the interfacial bonding strength of the composite material, which greatly reduces the adhesion of the coating. The pencil hardness, impact resistance, and acid and alkali resistance of Examples 1-3 are significantly higher than those of Comparative Examples 1-3. This is attributed to the high rigidity of the fluorocarbon chain and the dispersion enhancement effect of the nanofiller in the nano-protective coating prepared by this invention. Through the bonding of urethane groups and siloxane segments, a dynamic cross-linking network is formed. Combined with the gradient bisfluorinated modification design, the mechanical strength and hydrophobic anti-corrosion performance are simultaneously improved.

[0107] The fire resistance of the nano-protective coating was tested according to GB / T 2406-2008, GB / T 2408-2021, GB / T 8627-2007 (Method A), and GB / T 9978.1-2008 standards. The test results are shown below:

[0108] Table 2. Summary of Fire Resistance Performance Test Data

[0109]

[0110] As shown in Table 2, the fire resistance of the water-based nano-protective coatings provided in Examples 1-3 of this invention is significantly better than that of Comparative Examples 1-3. This strongly demonstrates the excellent fire resistance of the nano-protective coatings provided by this invention. Specifically, Example 1 utilizes the decomposition of ammonium polyphosphate at high temperatures to generate polyphosphoric acid, catalyzing the system to form char. Simultaneously, the nano-filler composition forms a heat-insulating layer, synergistically creating a thermal stability barrier (decomposition temperature > 400℃) with the fluorocarbon chain. This results in a vertical burning rating of V-0 (self-extinguishing ≤ 10s after flame removal), demonstrating optimal fire resistance. Furthermore, Example 1 utilizes the fluorocarbon chain... Modified polysiloxane reduces the combustion of organic matter (FC bonds inhibit free radical chain reactions), and nanofillers adsorb some smoke particles, which can also greatly reduce smoke density and mitigate secondary damage caused by toxic fumes in the fire. The fire resistance of Example 2 is slightly lower, presumably because the amount of ammonium polyphosphate is reduced and the amount of nanofillers is reduced, resulting in insufficient density of the insulation layer, which cannot completely suppress the spread of flames. Comparative Example 3 has the worst fire resistance because the use of fluorocarbon modified polysiloxane and nanofillers is eliminated, and only ammonium polyphosphate is relied on for flame retardancy. However, the incomplete combustion and decomposition of ammonium polyphosphate leads to a significant reduction in flame retardant performance.

[0111] 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 variations 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. A water-borne, nano protective paint based on the following characteristics, By mass parts including the following components: 50-60 parts of water-based polyurethane resin, 10-20 parts of fluorocarbon modified polysiloxane, 14-23 parts of modified nanofiller composition, 3-5 parts of ammonium polyphosphate, 10-12 parts of water-based fluorocarbon emulsion, 1-3 parts of silane coupling agent, 1-2 parts of dispersant, 2-4 parts of film forming aid, 1-2 parts of thickening agent, 0.5-1 part of defoaming agent, 10-15 parts of cosolvent, 20-40 parts of deionized water; The modified nanofiller composition is prepared by the following steps: S11. The corresponding mass of nanosilica, nanoalumina, and nanoaluminum hydroxide is weighed in proportion, and activated by treating at 180-200℃ for 2-3h; S12. The silane coupling agent is mixed with an ethanol aqueous solution with a concentration of 30-40% to prepare a grafting treatment solution; S13. The activated nanosilica, nanoalumina, and nanoaluminum hydroxide are sequentially immersed in the grafting treatment solution, and stirred at 80-90℃ for 3-4h, then centrifuged, washed, and dried to obtain a pre-modified nanofiller composition; S14. The pre-modified nanofiller composition is mixed with triethyl phosphate in an amount of 1-2%, and stirred at 60-70℃ for 1-2h to obtain the modified nanofiller composition; The fluorocarbon modified polysiloxane is prepared by the following steps: S21. 10-15 parts of (3,3,3-trifluoropropyl) methyldichlorosilane is dissolved in 50-60 parts of toluene, and hydrolyzed at 40-100℃ for 2-4h to form a fluorine-containing hydrolyzed homopolymer; S22. 8-9 parts of octamethylcyclotetrasiloxane, 1-2 parts of methyltrifluoropropylcyclotrisiloxane, 0.3-0.5 parts of hexamethyldisiloxane, and 0.01-0.1 parts of p-toluenesulfonic acid are sequentially added to the fluorine-containing hydrolyzed homopolymer, and polymerized at 60-120℃ for 6-12h to finally obtain a fluorocarbon modified polysiloxane; The modified nanofiller composition is a mixture of nanosilica, nanoalumina, and nanoaluminum hydroxide in a mass ratio of 5:3:

2.

2. A water-borne based nanorepelling paint according to claim 1, characterized in that, In step S12, the ratio of the silane coupling agent to the ethanol aqueous solution is 2-3:90-100, and the pH of the grafting treatment solution is controlled at 4-5.

3. A water-borne, nano protective paint based coating according to claim 2, characterized in that, In step S12, the silane coupling agent is selected from one or more of γ-aminopropyltriethoxysilane and γ-methacryloyloxypropyltrimethoxysilane.

4. A water-borne based nanorepelling paint according to claim 1, characterized in that, The dispersant is a polyacrylate dispersant, the thickening agent is a polyurethane associative thickening agent, and the defoaming agent is a silicone defoaming agent.

5. A water-borne based nanorepelling paint according to claim 1, characterized in that, The cosolvent is selected from one or more of propylene glycol, ethylene glycol butyl ether, and dipropylene glycol methyl ether, and the film forming aid is selected from one or more of propylene glycol phenyl ether and dodecanol ester.

6. A process for the production of a water-borne, nano-protective coating according to any one of claims 1 to 5, characterized in that The method comprises the following steps: S1. The water-based polyurethane resin, fluorocarbon modified polysiloxane, modified nanofiller composition, ammonium polyphosphate, and silane coupling agent are mixed, heated to 60-80℃, and stirred for 2-3h, then cooled to room temperature to obtain a primary coating; S2. The water-based paint-based nano protective coating is obtained by adding water-based fluorocarbon emulsion, dispersing agent, film-forming aid, thickening agent, defoaming agent, co-solvent, deionized water into the primary paint in sequence in proportion, stirring for 1-2 h after heating to 80-100°C, and cooling to room temperature.

7. A process for the production of a water-borne, nano-protective coating according to claim 6, characterized in that, The silane coupling agent is selected from one or more of gamma-aminopropyl triethoxysilane, gamma-methacryloyloxypropyl trimethoxysilane.

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