A self-layering room temperature curing water-based organic silicon high temperature resistant anticorrosive coating and a preparation method thereof

Abstract

This invention relates to a self-stratifying, room-temperature curing, water-based organosilicon high-temperature resistant anti-corrosion coating, comprising component A and component B. Component A mainly consists of the following components in parts by weight: 10-35 parts water-based methylphenyl silicone resin, 3-6 parts high-floatability water-based aluminum powder, 10-25 parts lamellar fillers talc powder and mica powder, 5-15 parts needle-like fillers alkali-free glass fiber and whisker silicon, 5-15 parts heat-resistant filler particles, 10-40 parts deionized water, 1-3 parts silane coupling agent; 0-0.5 parts dispersant, 0.2-0.5 parts defoamer, and 0.3-0.8 parts wetting and leveling aid. Component B is a hydrophilically coated modified powder, selected from one or more of zinc powder, zinc chrome yellow, and zinc phosphate. The mass ratio of component A to component B in the water-based organosilicon high-temperature resistant anti-corrosion coating is 100:3-15. The coating described in this invention is environmentally friendly, easy to apply, can be cured at room temperature, and can spontaneously form a self-layering coating during drying. It also exhibits excellent anti-corrosion properties before and after high temperatures.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating and its preparation method. Background Technology

[0002] High-temperature resistant coatings typically refer to specialized functional coatings that can withstand temperatures above 300℃ for extended periods while maintaining certain physicochemical properties, enabling the protected object to function normally in high-temperature environments. Traditional silicone-based high-temperature resistant coatings use solvent-based systems, resulting in high VOC content and potential pollution to the atmosphere and water. With increasing environmental awareness and rising demands for coatings, the water-based development of high-temperature resistant coatings has become an inevitable trend.

[0003] Patent CN 110885630 discloses a water-based high-temperature resistant special silicone coating and its preparation method. However, the introduced modified acrylic emulsion significantly reduces the coating's temperature resistance. The 10-25 parts of environmentally friendly solvent, while helpful for film formation, still result in a high VOC content. Patent CN 113429880A utilizes the characteristic of porous insulating silicates expanding 8-15 times in volume during high-temperature calcination, significantly improving the heat resistance, insulation, cold preservation, antifreeze, and sound insulation properties of water-based high-temperature resistant coatings. However, the resulting loosely textured expanding substances significantly reduce the coating's corrosion resistance.

[0004] Therefore, there is an urgent need to develop a water-based high-temperature resistant anti-corrosion coating that can cure at room temperature, has both temperature resistance and anti-corrosion properties, and especially has excellent anti-corrosion ability after high temperature. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating and its preparation method. This coating is a two-component system capable of room-temperature curing. During the drying and curing process, it forms a self-layering coating, further enhancing the coating's temperature resistance and anti-corrosion performance, while maintaining a low VOC content.

[0006] To achieve the above objectives, this invention provides a self-stratifying, room-temperature curing, water-based organosilicon high-temperature resistant anti-corrosion coating, comprising component A and component B. Component A mainly consists of the following components in parts by weight: 10-35 parts water-based methylphenyl silicone resin, 3-6 parts high-floatability water-based aluminum powder, 10-25 parts lamellar fillers talc powder and mica powder, 5-15 parts needle-like fillers alkali-free glass fiber and whisker silicon, 5-15 parts heat-resistant filler particles, 10-40 parts deionized water, 1-3 parts silane coupling agent; 0-0.5 parts dispersant, 0.2-0.5 parts defoamer, and 0.3-0.8 parts wetting and leveling aid. Component B is a hydrophilically coated modified powder, selected from one or more of zinc powder, zinc chrome yellow, and zinc phosphate. The mass ratio of component A to component B in the water-based organosilicon high-temperature resistant anti-corrosion coating is 100:3-15.

[0007] In one embodiment, the surface hydrophilic coating modification process of the powder in component B is as follows: the powder and the surface hydrophilic modifier are added together in a covered stainless steel container at a mass ratio of 100:1-5, and then an equal mass of grinding zirconium beads with a particle size of 0.3-3 mm are added. After sealing the container, it is dispersed by high-speed vibration for 60-120 minutes. After the system cools down, it is sieved through an 80-mesh copper screen to separate the zirconium beads, thus obtaining the hydrophilic coated modified powder.

[0008] In one embodiment, the waterborne methylphenyl silicone resin is a high molecular weight self-emulsifying silicone resin with a solid content of 40-50%, selected from DOWSIL. TM 8016 MP 50E and One or more of P 40 / W.

[0009] In one embodiment, the high-floatability water-based aluminum powder has a particle size of 5-25 μm and a water coverage area of ​​30,000 cm². 2 / g-45000cm 2 / g, with a flake diameter and thickness of 0.1-0.2μm.

[0010] In one embodiment, the high-floatability water-based aluminum powder has a particle size of 10-15 μm and a water coverage area of ​​30,000 cm². 2 / g-45000cm 2 / g, with a flake diameter and thickness of 0.1-0.2μm.

[0011] In one embodiment, the talc powder filler has a particle size of 3-5 μm and an aspect ratio of 20-50.

[0012] In one embodiment, the sheet filler mica powder has a particle size of 5-25 μm and an aspect ratio of 5-25.

[0013] In one embodiment, the needle-shaped filler glass fiber is 500-2000 mesh.

[0014] In one embodiment, the needle-shaped filler glass fiber is alkali-free glass fiber with a mesh size of 1000-1500.

[0015] In one embodiment, the needle-shaped filler silicon whiskers are 500-4000 mesh.

[0016] In one embodiment, the needle-shaped filler whisker silicon is 1000-2000 mesh.

[0017] In one embodiment, the heat-resistant filler is selected from one or more of titanium dioxide, zirconium oxide, precipitated barium sulfate, copper chromate black, cobalt blue, and cobalt green, and the particle size of the heat-resistant filler is 5-10 μm.

[0018] In one embodiment, the surface hydrophilic modifier is a 100% solids-content aqueous wetting and dispersing agent selected from one or more of UNIQ SPERSE 9370, Tech 6300, TEGO Dispers 740W, and Solsperse 27000.

[0019] In one embodiment, the silane coupling agent is one or more of dodecyltriethoxysilane, hexadecyltriethoxysilane, octadecyltriethoxysilane, and 3-glycidyl etheroxypropyltriethoxysilane.

[0020] In one embodiment, the dispersant is any one or more of BYK-191, AFCONA 4560, and EDAPLAN490; the defoamer is BYK-025; and the wetting and leveling agent is BYK-348.

[0021] In one embodiment, when preparing the coating using the self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating, components A and B need to be mixed evenly at a mass ratio of 100:3-15 before spraying. The coated sample can be cured at 25°C for 7 days, and the film thickness is 25-120μm.

[0022] In one embodiment, when preparing the coating using the self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating, components A and B need to be mixed evenly at a mass ratio of 100:3-15 before spraying. The coated sample can be cured at 25°C for 7 days, and the film thickness is 45-80μm.

[0023] A method for preparing the self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating includes the following steps:

[0024] (1) Add deionized water, dispersant, defoamer, wetting and leveling agent, pigment and filler to a suitable container, stir at 1500-2000 rpm for 15-25 min using a high-speed disperser, then add silane coupling agent and continue stirring at 1500-2000 rpm for 30-40 min. Finally, grind the mixture using a sand mill until the fineness is ≤20μm. After filtering, add metered high-floatability water-based aluminum powder and stir at 1000-1500 rpm for 15-25 min using a high-speed disperser. Then add water-based methyl phenyl silicone resin and stir and disperse evenly to obtain component A.

[0025] (2) Add one or more of zinc powder, zinc chrome yellow and zinc phosphate and surface hydrophilic modifier together in a mass ratio of 100:3-8 to a covered stainless steel container, then add an equal mass of grinding zircon beads with a particle size of 0.3-3 mm. After sealing the container, disperse the mixture by high-speed vibration for 40-60 min. After the system cools down, separate the zircon beads with an 80-mesh copper mesh to obtain component B.

[0026] (3) Mix component A and component B at a mass ratio of 100:3 to 15, stir at a speed of 800-1000 rpm for 20-25 minutes, and filter to obtain the self-layering room temperature curing water-based organosilicon high temperature corrosion resistant coating.

[0027] The main film-forming resin in the self-layering, room-temperature curing, waterborne silicone high-temperature resistant anti-corrosion coating of this invention is the waterborne phenylmethyl silicone resin in component A. Although this type of waterborne resin has a similar temperature resistance to oil-based silicone resins, its drying ability is weak due to its water-based treatment. It must be baked at 180-200℃ for 20-30 minutes to achieve individual film formation. In actual factory coating applications, this condition is usually unattainable. Therefore, a suitable curing method must be designed to achieve room-temperature self-drying. Component B is designed as one or more of hydrophilically modified zinc powder, zinc chrome yellow, and zinc phosphate because zinc ions have the effect of catalyzing the dehydration condensation of Si-OH in the waterborne phenylmethyl silicone resin. On the one hand, this achieves room-temperature self-drying of the coating; on the other hand, it can act as a rust-preventive filler, improving the anti-corrosion ability of the coating. Zinc powder, zinc chrome yellow, and zinc phosphate are modified through surface hydrophilic coating, enabling uniform dispersion in coatings without grinding, relying solely on high-speed dispersion. This ensures a uniform and dense coating, avoiding coating defects caused by poor coating fineness after mixing. The water-based aluminum powder in component A exhibits significant floating ability in the system. When the coating is sprayed onto the substrate surface, it rapidly migrates to the coating surface, forming a self-stratifying coating with an upper layer enriched with aluminum powder and a lower layer enriched with pigments and fillers. Compared to suspended and settling aluminum powders, the self-stratifying behavior of highly floating aluminum powder significantly reduces the amount of water-based aluminum powder used in the coating, increases the amount of other inorganic fillers, and lowers coating production costs. Furthermore, the surface-enriched aluminum powder layer helps compensate for substrate defects, improves the hiding power and protective performance of the paint film, enhances the coating's resistance to high and low temperature shocks, and enables thick coating, further improving the overall performance of the coating.

[0028] The self-stratifying, room-temperature curing waterborne silicone high-temperature resistant anti-corrosion coating of this invention features a simple preparation process and a long pot life. Room-temperature curing is achieved by introducing one or more of hydrophilically modified zinc powder, zinc chromate yellow, and zinc phosphate; a self-stratifying coating is formed by introducing highly floating aluminum powder. The highly floating lamellar aluminum powder, functional fillers, and rust-inhibiting pigments produce a good synergistic effect, resulting in a paint film with good resistance to thermal cycling, temperature resistance, and corrosion resistance. Detailed Implementation

[0029] Example 1

[0030] The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating of this embodiment is prepared by mixing component A and component B. Component A mainly consists of the following components in parts by weight: water-based methylphenyl silicone resin DOWSIL TMThe composition includes: 20 parts of 8016, 3 parts of 10μm high-floatability water-based aluminum powder, 15 parts of talc, 10 parts of mica powder, 7 parts of alkali-free glass fiber, 8 parts of whisker silicon, 5 parts of titanium dioxide, 15 parts of deionized water, and 1 part of dodecyltriethoxysilane; 0.4 parts of BYK-190, 0.2 parts of BYK-025, and 0.8 parts of BYK-348. Component B is hydrophilically coated and modified zinc powder, with UNIQ SPERSE 9370 as the modifier, used at 1% of the zinc powder mass.

[0031] The coating preparation method of this embodiment includes the following steps:

[0032] 1) Weigh the raw materials of component A according to the above proportions, add deionized water, additives, pigments and fillers to a suitable container, stir at 1500-2000 rpm for 15 minutes using a high-speed disperser, then add silane coupling agent, continue stirring at 1500-2000 rpm for 40 minutes, and finally grind using a sand mill until the fineness is ≤20μm. After filtering, add high-floatability water-based aluminum powder, stir at 1000-1200 rpm for 15 minutes using a high-speed disperser, then add water-based methylphenyl silicone resin, and further stir and disperse evenly to obtain component A;

[0033] 2) Weigh the raw materials of component B according to the above proportions, add zinc powder and UNIQ SPERSE 9370 together into a covered stainless steel container, add an equal mass of grinding zirconium beads with a particle size of 3mm, seal the container, and disperse using high-speed vibration for 60 minutes. After the system cools down, sieve it through an 80-mesh copper screen to separate the zirconium beads, thus obtaining component B.

[0034] 3) Mix component A and component B at a mass ratio of 100:3, stir at a speed of 800-1000 rpm for 20 minutes, and filter to obtain the self-layering room temperature curing water-based organosilicon high-temperature resistant anti-corrosion coating.

[0035] Example 2

[0036] The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating of this embodiment is prepared by mixing component A and component B. Component A mainly consists of the following components in parts by weight: water-based methylphenyl silicone resin. The composition consists of: 10 parts MP 50E, 6 parts 12μm high-floatability water-based aluminum powder, 5 parts talc, 5 parts mica powder, 5 parts alkali-free glass fiber, 5 parts whisker silicon, 10 parts cobalt green, 10 parts deionized water, 2.0 parts hexadecyltriethoxysilane; 0.5 parts AFCONA 4560, 0.5 parts BYK-025, and 0.3 parts BYK-348. Component B is a hydrophilically coated and modified zinc chromate yellow, modified with Tech 6300 at 5% of the zinc chromate yellow's mass.

[0037] The coating preparation method of this embodiment includes the following steps:

[0038] 1) Weigh the raw materials of component A according to the above proportions. Add deionized water, additives, pigments, and fillers to a suitable container. Stir at 1500-2000 rpm for 15 minutes using a high-speed disperser. Then add hexadecyltriethoxysilane and continue stirring at 1500-2000 rpm for 40 minutes. Finally, grind the mixture using a sand mill until the fineness is ≤20μm. After filtering, add high-floatability water-based aluminum powder and stir at 1000-1200 rpm for 15 minutes using a high-speed disperser. Then add resin. MP 50E, further stir and disperse evenly to obtain component A;

[0039] 2) Weigh the raw materials of component B according to the above proportions, add zinc chromate yellow and Tech 6300 together into a covered stainless steel container, then add an equal mass of grinding zirconium beads with a particle size of 0.3 mm, cover and seal, and disperse using high-speed vibration for 120 min. After the system cools down, sieve it through an 80-mesh copper screen to separate the zirconium beads, and obtain component B.

[0040] 3) Mix component A and component B at a mass ratio of 100:8, stir at a speed of 800-1000 rpm for 20 minutes, and filter to obtain the self-layering room temperature curing water-based organosilicon high temperature resistant anti-corrosion coating.

[0041] Example 3

[0042] The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating of this embodiment is prepared by mixing component A and component B. Component A mainly consists of the following components in parts by weight: water-based methylphenyl silicone resin. The composition includes: 35 parts P 40 / W, 4 parts 15μm high-floatability water-based aluminum powder, 5 parts talc, 5 parts mica powder, 5 parts alkali-free glass fiber, 5 parts whisker silicon, 5 parts zirconium oxide, 5 parts precipitated barium sulfate, 25 parts deionized water, 2.5 parts octadecyltriethoxysilane; 0.3 parts EDAPLAN 490, 0.4 parts BYK-025, and 0.6 parts BYK-348. Component B is hydrophilically coated and modified zinc phosphate, with TEGO Dispers 740W as the modifier, used at 5% of the zinc phosphate mass.

[0043] The coating preparation method of this embodiment includes the following steps:

[0044] 1) Weigh the raw materials of component A according to the above proportions. Add deionized water, additives, pigments, and fillers to a suitable container. Stir at 1500-2000 rpm for 15 minutes using a high-speed disperser. Then add octadecyltriethoxysilane and continue stirring at 1500-2000 rpm for 40 minutes. Finally, grind the mixture using a sand mill until the fineness is ≤20μm. After filtering, add high-floatability water-based aluminum powder and stir at 1000-1200 rpm for 15 minutes using a high-speed disperser. Then add resin. MP 50E, further stir and disperse evenly to obtain component A;

[0045] 2) Weigh the raw materials of component B according to the above proportions, add zinc phosphate and TEGO Dispers 740W together into a covered stainless steel container, add an equal mass of grinding zirconium beads with a particle size of 2mm, seal the container, and disperse using high-speed vibration for 90 minutes. After the system cools down, sieve it through an 80-mesh copper screen to separate the zirconium beads, thus obtaining component B.

[0046] 3) Mix component A and component B at a mass ratio of 100:10, stir at a speed of 800-1000 rpm for 25 minutes, and filter to obtain the self-layering room temperature curing water-based organosilicon high temperature resistant anti-corrosion coating.

[0047] Example 4

[0048] The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating of this embodiment is prepared by mixing component A and component B. Component A mainly consists of the following components in parts by weight: water-based methylphenyl silicone resin DOWSIL TM 8016 15 copies, The composition includes: 20 parts P 40 / W, 6 parts 18μm high-floatability water-based aluminum powder, 10 parts talc, 10 parts whisker silicon, 15 parts copper chromium black, 40 parts deionized water, 3 parts 3-glycidyl etheroxypropyltriethoxysilane, 0.4 parts BYK-025, and 0.6 parts BYK-348. Component B consists of hydrophilically coated and modified zinc powder and zinc phosphate, with Tech 6300 as the modifier, used at 4% of the powder mass.

[0049] The coating preparation method of this embodiment includes the following steps:

[0050] 1) Weigh the raw materials of component A according to the above proportions. Add deionized water, additives, pigments, and fillers to a suitable container. Stir at 1500-2000 rpm for 15 minutes using a high-speed disperser. Then add 3-glycidyl etheroxypropyltriethoxysilane and continue stirring at 1500-2000 rpm for 40 minutes. Finally, grind the mixture using a sand mill until the fineness is ≤20μm. After filtering, add high-floatability water-based aluminum powder and stir at 1000-1200 rpm for 15 minutes using a high-speed disperser. Then add DOWSIL resin. TM 8016 and P 40 / W, further stirring and dispersing until uniform to obtain component A;

[0051] 2) Weigh the raw materials of component B according to the above proportions. Add zinc powder, zinc phosphate and Tech 6300 together to a stainless steel container with a lid. Then add an equal mass of zirconium beads for grinding. The zirconium beads have a particle size of 3mm. Seal the container and disperse it using high-speed vibration for 90 minutes. After the system cools down, sieve it through an 80-mesh copper screen to separate the zirconium beads. Component B is then obtained.

[0052] 3) Mix component A and component B at a mass ratio of 100:15, stir at a speed of 800-1000 rpm for 25 minutes, and filter to obtain the self-layering room temperature curing water-based organosilicon high temperature resistant anti-corrosion coating.

[0053] Example 5

[0054] The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating of this embodiment is prepared by mixing component A and component B. Component A mainly consists of the following components in parts by weight: water-based methylphenyl silicone resin. The composition consists of 25 parts MP 50E, 5 parts 20μm high-floatability water-based aluminum powder, 20 parts talc, 5 parts whisker silicon, 10 parts cobalt blue, 30 parts deionized water, 2 parts 3-glycidyl etheroxypropyltriethoxysilane, 0.3 parts BYK-025, and 0.5 parts BYK-348. Component B comprises hydrophilically coated and modified zinc powder, zinc chrome yellow, and zinc phosphate. The modifier is Solsperse 27000, used at 3% of the powder mass, with a mass ratio of modified zinc powder, modified zinc chrome yellow, and modified zinc phosphate of 1:3:4.

[0055] The coating preparation method of this embodiment includes the following steps:

[0056] 1) Weigh the raw materials of component A according to the above proportions. Add deionized water, additives, pigments, and fillers to a suitable container. Stir at 1500-2000 rpm for 15 minutes using a high-speed disperser. Then add 3-glycidyl etheroxypropyltriethoxysilane and continue stirring at 1500-2000 rpm for 40 minutes. Finally, grind the mixture using a sand mill until the fineness is ≤20μm. After filtering, add high-floatability water-based aluminum powder and stir at 1000-1200 rpm for 15 minutes using a high-speed disperser. Then add resin. 25 parts of MP 50E were further stirred and dispersed evenly to obtain component A.

[0057] 2) Weigh the raw materials of component B according to the above proportions. Add zinc powder, zinc chrome yellow, zinc phosphate and Solsperse 27000 together into a covered stainless steel container. Then add an equal mass of grinding zircon beads with a particle size of 1 mm. Seal the container and disperse it using high-speed vibration for 60 minutes. After the system cools down, sieve it through an 80-mesh copper screen to separate the zircon beads, and you will get component B.

[0058] 3) Mix component A and component B at a mass ratio of 100:10, stir at a speed of 800-1000 rpm for 15 minutes, and filter to obtain the self-layering room temperature curing water-based organosilicon high-temperature resistant anti-corrosion coating.

[0059] The water-covering area of ​​the highly buoyant water-based aluminum powder used in Examples 1-5 is 30,000 cm². 2 / g-45000cm 2 / g, with a flake diameter and thickness of 0.1-0.2μm.

[0060] Comparative Example 1

[0061] The comparative coating is designed as a single-component system, selected from component A in Example 1.

[0062] Comparative Example 2

[0063] The comparative coating is designed as a dual single-component system. The formulation and preparation process are the same as in Example 3. The only difference from Example 3 is that the system does not contain highly buoyant waterborne aluminum powder.

[0064] (1) Preparation of the template

[0065] The coatings prepared in Examples 1-5, Comparative Examples 1 and 2 were sprayed onto the substrate using compressed air to obtain coated samples. The air pressure was 0.4-0.6 MPa, and the substrates were tinplate and sandblasted steel plates. The samples were then placed at room temperature (25°C) for 7 days for curing.

[0066] (2) Performance Testing

[0067] The performance of flexible ceramic coatings was tested according to the relevant national standard methods for coatings. The test items, test methods and corresponding substrates are shown in Table 1, and the test results of the prepared samples are shown in Table 2.

[0068] Table 1. Coating Inspection Items, Test Methods, and Corresponding Substrates

[0069]

[0070]

[0071] Table 2 Results of Coating Performance Tests

[0072]

[0073] The test results in Table 2 show that the self-layering, room-temperature curing waterborne silicone high-temperature resistant anti-corrosion coating of this invention has the advantages of simple preparation process and long service life. Room-temperature curing is achieved by introducing one or more of hydrophilic-coated modified zinc powder, zinc chromate yellow, and zinc phosphate; a self-layering coating is formed by introducing highly floating aluminum powder. The highly floating lamellar aluminum powder, functional fillers, and anti-rust pigments can produce a good synergistic effect, and the final coating film has good resistance to thermal cycling, temperature resistance, and anti-corrosion performance.

[0074] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. A self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating, characterized in that, The water-based organosilicon high-temperature resistant anticorrosion coating comprises component A and component B. Component A mainly consists of the following components in parts by weight: 10-35 parts water-based methylphenyl silicone resin, 3-6 parts high-floatability water-based aluminum powder, 10-25 parts lamellar fillers talc powder and mica powder, 5-15 parts needle-like fillers alkali-free glass fiber and whisker silicon, 5-15 parts heat-resistant filler particles, 10-40 parts deionized water, 1-3 parts silane coupling agent, 0-0.5 parts dispersant, 0.2-0.5 parts defoamer, and 0.3-0.8 parts wetting and leveling aid. Component B is a surface-hydrophilically coated modified powder, selected from one or more of zinc powder, zinc chrome yellow, and zinc phosphate. The mass ratio of component A to component B in the water-based organosilicon high-temperature resistant anticorrosion coating is 100:3-15. The surface hydrophilic coating modification process of the powder in component B is as follows: the powder and the surface hydrophilic modifier are added together in a covered stainless steel container at a mass ratio of 100:1-5, and then an equal mass of grinding zirconium beads with a particle size of 0.3-3mm are added. After sealing the container, it is dispersed by high-speed vibration for 60-120 minutes. After the system cools down, it is sieved through an 80-mesh copper screen to separate the zirconium beads, thus obtaining the surface hydrophilic coated modified powder.

2. The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating according to claim 1, characterized in that: The highly buoyant water-based aluminum powder has a particle size of 5-25 μm and a water coverage area of ​​30,000 cm². 2 / g-45000cm 2 / g, with a flake diameter and thickness of 0.1-0.2μm.

3. The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating according to claim 1, characterized in that: The aqueous methylphenyl silicone resin is a high molecular weight self-emulsifying organosilicon resin with a solid content of 40-50%, selected from DOWSIL. TM 8016, SILRES ® MP 50 E and SiliKophen ® One or more of P 40 / W.

4. The self-layering, room-temperature curing, water-based organosilicon high-temperature resistant anti-corrosion coating according to claim 1, characterized in that: The mica powder used as a sheet filler has a particle size of 5-25 μm and an aspect ratio of 5-25.

5. The self-layering, room-temperature curing, water-based organosilicon high-temperature resistant anti-corrosion coating according to claim 1, characterized in that: The needle-shaped filler is made of alkali-free glass fiber with a mesh size of 500-2000.

6. The self-layering, room-temperature curing, water-based organosilicon high-temperature resistant anti-corrosion coating according to claim 1 or 2, characterized in that: The needle-shaped filler is made of 500-4000 mesh silicon whiskers.

7. The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating according to claim 1, characterized in that: The surface hydrophilic modifier is a 100% solids-content water-based wetting and dispersing agent selected from one or more of UNIQ SPERSE 9370, Tech 6300, TEGO Dispers 740W, and Solsperse 27000.

8. The self-layering, room-temperature curing, water-based silicone high-temperature resistant anti-corrosion coating according to claim 1, characterized in that, The dispersant is any one or more of BYK-191, AFCONA 4560, and EDAPLAN 490; the defoamer is BYK-025; and the wetting and leveling agent is BYK-348.

9. A method for preparing a self-layering, room-temperature curing, water-based organosilicon high-temperature resistant anti-corrosion coating as described in any one of claims 1-8, characterized in that, Includes the following steps: (1) Add deionized water, dispersant, defoamer, wetting and leveling agent, lamellar filler talc powder and mica powder, needle filler alkali-free glass fiber and whisker silicon and heat-resistant filler particles into a suitable container, stir at 1500-2000 rpm for 15-25 min using a high-speed disperser, then add silane coupling agent, continue stirring at 1500-2000 rpm for 30-40 min, finally grind with a sand mill and disperse until the fineness is ≤20μm, filter and discharge, add metered high-float water-based aluminum powder, stir at 1000-1500 rpm for 15-25 min using a high-speed disperser, then add water-based methyl phenyl silicone resin, and further stir and disperse evenly to obtain component A; (2) Add one or more of zinc powder, zinc chrome yellow and zinc phosphate and surface hydrophilic modifier together in a mass ratio of 100:1-5 to a covered stainless steel container, then add an equal mass of grinding zircon beads with a particle size of 0.3-3 mm. After sealing the container, shake and disperse at high speed for 60-120 min. After the system cools down, separate the zircon beads with an 80-mesh copper mesh to obtain component B. (3) Mix component A and component B at a mass ratio of 100:3 to 15, stir at a speed of 800-1000 rpm for 20-25 minutes, and filter to obtain the self-layering room temperature curing water-based organosilicon high temperature corrosion resistant coating.

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