Acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive paint and preparation method thereof

Abstract

The invention belongs to the technical field of silicon-based epoxy elastic anticorrosive coatings, and particularly relates to an acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating and a preparation method thereof, the acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating comprises 85-115 parts of a mixed resin material, 30-50 parts of a pigment, 15-20 parts of a filler, 5-10 parts of propylene carbonate, 15-20 parts of benzyl alcohol, 5-11 parts of adipic dihydrazide, 0.2-0.5 part of a modified acrylate leveling agent, 1.5-2 parts of hydroxypropyl methyl cellulose and 20-30 parts of water. The raw materials of the acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating are improved, the organic silicon resin, the silicon carbide epoxy resin, the dimethyl carbonate, the titanium hydride powder and the silicon carbide-clay dense powder are mixed to form a mixed resin material, and the mixed resin material is beneficial to improving the adhesiveness of the coating; and the coating still keeps high elasticity under the action of the organic silicon resin and the silicon carbide epoxy resin, the characteristic that the coating expands with heat and contracts with cold along with a base material is met, and the coating is not prone to falling off after being coated.

Description

Technical Field

[0001] The present invention belongs to the technical field of silicone-based epoxy elastic anti-corrosion coatings, and specifically relates to an acid-resistant and high-temperature-resistant silicone-based epoxy elastic anti-corrosion coating and a preparation method thereof. Background Art

[0002] In the construction field, the corrosion problem has always been a key factor affecting the safety and durability of steel structures. Steel structures are prone to corrosion in the atmospheric environment, resulting in a decrease in their load-bearing capacity, a shortening of their service life, and even the possibility of triggering serious safety accidents. Coating the surface of steel structures with anti-corrosion coatings is one of the effective anti-corrosion measures. The coating can act as an isolation layer to prevent the surface of the building steel structure from directly contacting the outside (rainwater, air, etc.), thereby effectively protecting the building steel structure.

[0003] Since building steel structures are generally used outdoors, the high-temperature irradiation in summer can cause the surface temperature of the building steel structure to reach above 50 °C. The thermal expansion coefficients of the anti-corrosion coating on the surface and the steel structure itself are inconsistent, which will cause slippage between the anti-corrosion coating layer and the surface of the steel structure. Prolonged heat and cold alternation will cause the anti-corrosion coating to be easily peeled off. Summary of the Invention

[0004] The purpose of the present invention is to provide an acid-resistant and high-temperature-resistant silicone-based epoxy elastic anti-corrosion coating and a preparation method thereof to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] The acid-resistant and high-temperature-resistant silicone-based epoxy elastic anti-corrosion coating contains, by weight:

[0007] 85-115 parts of a mixed resin material, 30-50 parts of a pigment, 15-20 parts of a filler, 5-10 parts of propylene carbonate, 15-20 parts of benzyl alcohol, 5-11 parts of adipic dihydrazide, 0.2-0.5 part of a modified acrylate leveling agent, 1.5-2 parts of hydroxypropyl methylcellulose, and 20-30 parts of water.

[0008] The mixed resin material contains: silicone resin, silicon carbide epoxy resin, dimethyl carbonate, titanium hydride powder, silicon carbide-clay compact powder. Among them, the mass percentage of titanium hydride powder in the mixed resin material is 3%-7%, preferably 4-4.6% by mass percentage, and the mass percentage of the silicon carbide-clay compact powder in the mixed resin material is 3%-6%, preferably 4.2-4.8% by mass percentage.

[0009] The silicon carbide-clay compact powder is a nano-scale powder (1-100 nanometers), and preferably 60-90 nanometers of silicon carbide-clay compact powder is used.

[0010] In the raw materials of the acid- and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating, the mixed resin material serves as the main film-forming substance, which includes silicone resin, silicon carbide epoxy resin, dimethyl carbonate, titanium hydride powder, and silicon carbide-clay dense powder. Both silicone resin and silicon carbide epoxy resin have good stability, weather resistance, and oxidation resistance in high-temperature environments. Titanium hydride powder and silicon carbide-clay dense powder have good stability, and titanium hydride powder can form a suspension with silicone resin and silicon carbide epoxy resin during the mixing process. This suspension can make the coating exhibit high adhesiveness during subsequent use, while the overall coating still maintains high elasticity under the action of silicone resin and silicon carbide epoxy resin, meeting the characteristics of the coating following the thermal expansion and contraction of the substrate. In terms of coating performance, this is manifested as not being easily peeled off. Due to the relatively high viscosity of silicone resin, it may cause agglomeration of titanium hydride powder during the mixing process, affecting the formation and stability of the suspension. Dimethyl carbonate solvent is used to adjust the fluidity of titanium hydride powder during the mixing of silicone resin and silicon carbide epoxy resin, improving the comprehensive performance of the mixed resin material. Considering the risk factors of titanium hydride powder during a fire, the mass percentage of titanium hydride powder in the mixed resin material is controlled at 3% - 7%, preferably 4 - 4.6%, and silicon carbide-clay dense powder is used to enhance the compactness after the suspension film formation. Generally, the silicon carbide-clay dense powder is a nano-scale powder (1 - 100 nanometers) to ensure the fluidity of the silicon carbide-clay dense powder in the silicone resin and silicon carbide epoxy resin materials.

[0011] In the raw materials of the acid- and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating, adipic dihydrazide acts as a curing agent, achieving the purpose of curing through long-term contact with environments such as oxygen and high temperature. The modified acrylate leveling agent is used to increase the coating uniformity, and hydroxypropyl methylcellulose is used to improve the internal characteristics of the material, making the mixed resin material, pigments, fillers, etc. have obvious integrity and preventing the coating from cracking by itself during use. Propylene carbonate and benzyl alcohol help improve the chemical resistance of the coating, enhancing the coating's resistance to chemical substances such as acids and alkalis, making it suitable for anticorrosive coatings in harsh environments. It can also improve the film-forming performance, contribute to the formation of a uniform and smooth coating, reduce coating defects and cracking, improve the adhesion and mechanical strength of the coating, and can also adjust the drying speed, etc.

[0012] Optionally, the mass ratio of silicone resin to silicon carbide epoxy resin in the mixed resin material is 1:0.9 - 1.1, and silicone resin and silicon carbide epoxy resin can be mixed in a mass ratio of 1:1. The fluidity of the silicon carbide epoxy resin at room temperature is 3000 - 4600 mPa·s.

[0013] Optionally, the pigment is any one of iron oxide, titanium dioxide, phthalocyanine blue, and azo.

[0014] Optionally, the filler is any one of calcium carbonate, talcum powder, barium sulfate, kaolin, wollastonite powder, mica powder, bentonite, aluminum hydroxide, and magnesium hydroxide.

[0015] A preparation method of an acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating includes the following steps:

[0016] S1. Preparation of a mixed resin material

[0017] S101. Weigh equal masses of silicone resin and silicon carbide epoxy resin and add them to a reaction kettle for mixing and stirring. The temperature of the reaction kettle is controlled at 140-160°C, the stirring speed is 100-300 rpm, and the stirring time is 10-25 min to obtain an intermediate product.

[0018] S102. Primarily mix dimethyl carbonate, titanium hydride powder, and silicon carbide-clay compacted powder into a paste or paste-like substance. The mass ratio of dimethyl carbonate, titanium hydride powder, and silicon carbide-clay compacted powder is 1:1:1.

[0019] S103. Cool the reaction kettle to room temperature, add the paste or paste-like substance obtained in S102 to the reaction kettle, and stir and mix it with the intermediate product. The stirring speed is 100-300 rpm.

[0020] S2. Preparation of the coating

[0021] Mix the resin material, pigment, filler, propylene carbonate, benzyl alcohol, adipic dihydrazide, modified acrylate leveling agent, hydroxypropyl methylcellulose, and water in a reaction kettle according to a ratio to obtain a silicon-based epoxy elastic anticorrosive coating.

[0022] Optionally, the preparation method of the silicon carbide-clay compacted powder includes the following steps:

[0023] Mix silicon carbide powder and clay powder according to a mass ratio of (60-80):(20-40). The average particle size of the silicon carbide powder is 0.5-10 μm; the average particle size of the clay powder is 1-5 μm.

[0024] Add an organic binder and water to the mixed powder, and make a green body after mixing evenly.

[0025] Place the green body in a sintering furnace and sinter it under a protective atmosphere. The sintering temperature is 1350°C-1700°C, the heating rate is 1-5°C / min, and the holding time is 0.5-3 h.

[0026] Take out the sintered product and perform a pulverization treatment. The particle size after pulverization is a nanoscale powder.

[0027] Optionally, the protective atmosphere is nitrogen, argon, or a mixed gas thereof, and the gas flow rate is 10-50 L / min.

[0028] Optionally, the organic binder is any one of epoxy resin, carboxymethyl cellulose, and polyacrylamide.

[0029] Optionally, the mass of the paste or paste is 8% - 12% of the intermediate product.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] By improving the raw materials of the acid- and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating, the present invention is based on a mixed resin material made by mixing silicone resin, silicon carbide epoxy resin, dimethyl carbonate, titanium hydride powder, and silicon carbide-clay compact powder. The mixed resin material helps to improve the adhesion of the coating, and still maintains high elasticity under the action of silicone resin and silicon carbide epoxy resin, meeting the characteristics of the coating expanding and contracting with the substrate thermally. This is manifested in the coating performance as being not easy to fall off; the selected raw materials, silicone resin, silicon carbide epoxy resin, dimethyl carbonate, titanium hydride powder, and silicon carbide-clay compact powder, all have good stability, weather resistance, and oxidation resistance in high-temperature environments, and the prepared coating has the properties of high temperature resistance and acid resistance; the weather resistance of silicone resin, the wear resistance of silicon carbide epoxy resin, and the mixture of titanium hydride powder and silicon carbide-clay compact powder make the coating have good comprehensive performance and be applicable to various environments. Specific Embodiments

[0032] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Example 1

[0034] The acid- and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating contains, by weight: 85 - 115 parts of mixed resin material, 30 - 50 parts of pigment, 15 - 20 parts of filler, 5 - 10 parts of propylene carbonate, 15 - 20 parts of benzyl alcohol, 5 - 11 parts of adipic dihydrazide, 0.2 - 0.5 part of modified acrylate leveling agent, 1.5 - 2 parts of hydroxypropyl methylcellulose, and 20 - 30 parts of water.

[0035] Preferably, it contains, by weight: 95 parts of mixed resin material, 37 parts of pigment, 17 parts of filler, 8 parts of propylene carbonate, 17 parts of benzyl alcohol, 9 parts of adipic dihydrazide, 0.4 part of modified acrylate leveling agent, 1.8 parts of hydroxypropyl methylcellulose, and 23 parts of water.

[0036] The mixed resin material comprises: silicone resin, silicon carbide epoxy resin, dimethyl carbonate, titanium hydride powder, silicon carbide-clay compacted powder. Among them, the mass percentage of titanium hydride powder in the mixed resin material is 3% - 7%, and the mass percentage of the silicon carbide-clay compacted powder in the mixed resin material is 3% - 6%.

[0037] The silicon carbide-clay compacted powder is a nanoscale powder, and the preparation method of the silicon carbide-clay compacted powder comprises the following steps:

[0038] Mix silicon carbide powder and clay powder according to the mass ratio of (60 - 80):(20 - 40), wherein the average particle size of the silicon carbide powder is 0.5 - 10μm; the average particle size of the clay powder is 1 - 5μm;

[0039] Add an epoxy resin organic binder and water to the mixed powder, and make a green body after mixing evenly;

[0040] Place the green body in a sintering furnace and sinter it under a protective atmosphere. The protective atmosphere is nitrogen, the gas flow rate is 10 - 50L / min, the sintering temperature is 1350℃ - 1700℃, the heating rate is 1 - 5℃ / min, and the holding time is 0.5 - 3h.

[0041] Take out the sintered product and conduct a crushing treatment. The particle size after crushing is a nanoscale powder.

[0042] The mass ratio of silicone resin to silicon carbide epoxy resin in the mixed resin material is 1:1, and the fluidity of the silicon carbide epoxy resin at room temperature is 3000 - 4600mPa·s.

[0043] The pigment is any one of iron oxide, titanium dioxide, phthalocyanine blue, and azo.

[0044] The filler is any one of calcium carbonate, talc powder, barium sulfate, kaolin, wollastonite powder, mica powder, bentonite, aluminum hydroxide, and magnesium hydroxide.

[0045] Example Two

[0046] The preparation method of the silicon carbide-clay compacted powder comprises the following steps:

[0047] Mix silicon carbide powder and clay powder in a mass ratio of 67:24. The average particle size of the silicon carbide powder is 0.5 - 10 μm; the average particle size of the clay powder is 1 - 5 μm. Add an epoxy resin organic binder and water to the mixed powder. The epoxy resin organic binder and water are mixed in a mass ratio of 1:3, and the addition amount should ensure uniform mixing and easy molding. After uniform mixing, form a green body. Then place the green body in a sintering furnace and sinter it under a protective atmosphere. The protective atmosphere is nitrogen, the gas flow rate is 30 L / min, the sintering temperature is 1450 °C, the heating rate is 4 °C / min, and the holding time is 2.2 h. Take out the sintered product and perform crushing treatment. The particle size after crushing is nanoscale powder.

[0048] Example Three

[0049] Prepare a silicon-based epoxy elastic anticorrosive coating using the silicon carbide-clay tightly bonded powder obtained in Example Two.

[0050] Weigh equal masses of silicone resin and silicon carbide epoxy resin and add them to a reaction kettle for mixing and stirring. Control the temperature of the reaction kettle at 180 °C and stir at 220 rpm for 18 min to obtain an intermediate product. And preliminarily mix dimethyl carbonate, titanium hydride powder, and silicon carbide-clay tightly bonded powder into a paste or paste-like substance. The ratio of dimethyl carbonate, titanium hydride powder, and silicon carbide-clay tightly bonded powder is 1:1:1. Cool the reaction kettle to room temperature. Add the obtained paste or paste-like substance to the reaction kettle and stir and mix it with the intermediate product at 220 rpm. The mass of the paste or paste-like substance is 10% of the intermediate product.

[0051] Mix in a reaction kettle to obtain a silicon-based epoxy elastic anticorrosive coating according to the ratio of 95 parts of mixed resin material, 37 parts of pigment, 17 parts of filler, 8 parts of propylene carbonate, 17 parts of benzyl alcohol, 9 parts of adipic dihydrazide, 0.4 part of modified acrylate leveling agent, 1.8 parts of hydroxypropyl methylcellulose, and 23 parts of water by weight.

[0052] Example Four

[0053] Weigh equal masses of silicone resin and silicon carbide epoxy resin and add them to a reaction kettle for mixing and stirring. Control the temperature of the reaction kettle at 180 °C and stir at 220 rpm for 18 min to obtain an intermediate product. And preliminarily mix dimethyl carbonate, titanium hydride powder, and silicon carbide powder into a paste or paste-like substance. The ratio of dimethyl carbonate, titanium hydride powder, and silicon carbide powder is 1:1:1. Cool the reaction kettle to room temperature, and add the obtained paste or paste-like substance to the reaction kettle and stir and mix it with the intermediate product at 220 rpm. The mass of the paste or paste-like substance is 9% of the intermediate product.

[0054] Mix 95 parts by weight of a mixed resin material, 37 parts of a pigment, 17 parts of a filler, 8 parts of propylene carbonate, 17 parts of benzyl alcohol, 9 parts of adipic dihydrazide, 0.4 part of a modified acrylate leveling agent, 1.8 parts of hydroxypropyl methylcellulose, and 23 parts of water in a reaction kettle to obtain a silicon-based epoxy elastic anticorrosive coating.

[0055] Example Five

[0056] Weigh equal masses of an organosilicon resin and a silicon carbide epoxy resin and add them to a reaction kettle for mixing and stirring. Control the temperature of the reaction kettle at 180 °C and stir at 220 rpm for 18 min to obtain an intermediate product; and preliminarily mix dimethyl carbonate, titanium hydride powder, and clay powder into a paste or paste-like substance, and the ratio of dimethyl carbonate, titanium hydride powder, and clay powder is 1:1:1; cool the reaction kettle to room temperature; add the obtained paste or paste-like substance to the reaction kettle and stir and mix it with the intermediate product at 220 rpm. The mass of the paste or paste-like substance is 11% of the intermediate product.

[0057] Mix 95 parts by weight of a mixed resin material, 37 parts of a pigment, 17 parts of a filler, 8 parts of propylene carbonate, 17 parts of benzyl alcohol, 9 parts of adipic dihydrazide, 0.4 part of a modified acrylate leveling agent, 1.8 parts of hydroxypropyl methylcellulose, and 23 parts of water in a reaction kettle to obtain a silicon-based epoxy elastic anticorrosive coating.

[0058] Example Six

[0059] Use the silicon carbide-clay compact powder prepared in Example Two to prepare a silicon-based epoxy elastic anticorrosive coating.

[0060] Weigh equal masses of an organosilicon resin and a silicon carbide epoxy resin and add them to a reaction kettle for mixing and stirring. Control the temperature of the reaction kettle at 180 °C and stir at 220 rpm for 18 min to obtain an intermediate product; and preliminarily mix dimethyl carbonate and silicon carbide-clay compact powder into a paste or paste-like substance, and the ratio of dimethyl carbonate and silicon carbide-clay compact powder is 1:1; cool the reaction kettle to room temperature, add the paste or paste-like substance to the reaction kettle and stir and mix it with the intermediate product at 220 rpm. The mass of the paste or paste-like substance is 10% of the intermediate product.

[0061] Mix 95 parts by weight of a mixed resin material, 37 parts of a pigment, 17 parts of a filler, 8 parts of propylene carbonate, 17 parts of benzyl alcohol, 9 parts of adipic dihydrazide, 0.4 part of a modified acrylate leveling agent, 1.8 parts of hydroxypropyl methylcellulose, and 23 parts of water in a reaction kettle to obtain a silicon-based epoxy elastic anticorrosive coating.

[0062] Example Seven

[0063] Weigh equal masses of silicone resin and silicon carbide epoxy resin and add them to a reaction kettle for mixing and stirring. Control the temperature of the reaction kettle at 180 °C and stir at 220 rpm for 18 minutes to obtain an intermediate product. Then, preliminarily mix dimethyl carbonate and titanium hydride powder to form a paste or paste-like substance, and the ratio of dimethyl carbonate to titanium hydride powder is 1:1. Cool the reaction kettle to room temperature, add the paste or paste-like substance to the reaction kettle, and stir and mix it with the intermediate product at 220 rpm. The mass of the paste or paste-like substance is 10% of that of the intermediate product.

[0064] Mix 95 parts of mixed resin material, 37 parts of pigment, 17 parts of filler, 8 parts of propylene carbonate, 17 parts of benzyl alcohol, 9 parts of adipic dihydrazide, 0.4 parts of modified acrylate leveling agent, 1.8 parts of hydroxypropyl methylcellulose, and 23 parts of water by weight in a reaction kettle to obtain a silicone-based epoxy elastic anticorrosive coating.

[0065] Performance test:

[0066] Apply the acid- and high-temperature-resistant silicone-based epoxy elastic anticorrosive coatings obtained in Examples 3 to 7 on the Q235 steel substrate after surface grinding treatment in the same way. The coating thickness is 85 ± 5 microns. After natural drying and curing for 2 to 3 days, conduct acid resistance, high-temperature resistance, and adhesion tests on the test materials obtained. The results are shown in Table 1:

[0067] Acid resistance test: Place the test material in a 3% hydrochloric acid solution, soak it for 24 hours, and then take it out for testing.

[0068] High-temperature resistance test: Put the test material into a high-temperature oven and set different temperature conditions of 80 °C, 120 °C, and 200 °C respectively, and treat it for 2 hours at each temperature.

[0069] Adhesion test: Heat the test material in a high-temperature oven to 80 °C, then cool it to -5 °C, repeat it more than 10 times, and then rinse it with a 3 MPa high-pressure water gun for 5 minutes.

[0070] Table 1

[0071]

[0072] From the data comparison in Table 1, it can be seen that titanium hydride powder can improve the compactness of the mixed resin material, show good acid resistance during the acid resistance performance test, and avoid the corrosion of metal parts caused by the short-term damage of the coating by acidic substances. However, the high-temperature resistance of titanium hydride powder is poor. By adding a powder material containing clay powder, its high-temperature resistance can be improved. After repeated high and low temperature treatments, the acid and high temperature resistant silicone-based epoxy elastic anticorrosive coating containing titanium hydride powder and clay powder shows insufficient elasticity. The bonding part between the anticorrosive coating and the steel structure is very dense, and there is a difference in the thermal expansion coefficient between the anticorrosive coating and the steel structure itself. During the repeated heating-cooling process, problems such as bonding failure are prone to occur, and problems such as flaky peeling and dot peeling are likely to occur. The silicon carbide-clay dense powder prepared by sintering and pulverizing in Example 2 shows the same high adhesion test performance as the titanium hydride powder particles. It can be seen from Table 1 that the acid and high temperature resistant silicone-based epoxy elastic anticorrosive coating prepared in Example 3 has the best comprehensive performance.

[0073] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating, characterized in that: Contains by weight: Mix 85-115 parts of resin material, 30-50 parts of pigment, 15-20 parts of filler, 5-10 parts of propylene carbonate, 15-20 parts of benzyl alcohol, 5-11 parts of adipic acid dihydrazide, 0.2-0.5 parts of modified acrylate leveling agent, 1.5-2 parts of hydroxypropyl methylcellulose and 20-30 parts of water; The mixed resin material comprises: silicone resin, silicon carbide epoxy resin, dimethyl carbonate, titanium hydride powder and silicon carbide-clay dense powder, wherein the mass percentage of titanium hydride powder in the mixed resin material is 3% to 7%, and the mass percentage of silicon carbide-clay dense powder in the mixed resin material is 3% to 6%; The silicon carbide-clay dense powder is a nanometer-level powder.

2. The acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to claim 1, characterized in that: The mass ratio of the organic silicon resin to the silicon carbide epoxy resin in the mixed resin material is 1:0.9-1.1, and the fluidity of the silicon carbide epoxy resin at room temperature is 3000-4600 mPa·s.

3. The acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to claim 1, characterized in that: The pigment is any one of iron oxide, titanium dioxide, phthalocyanine blue and azo.

4. The acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to claim 1, characterized in that: The filler is any one of calcium carbonate, talc, barium sulfate, kaolin, wollastonite powder, mica powder, bentonite, aluminum hydroxide and magnesium hydroxide.

5. The method for preparing the acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Preparation of mixed resin material S101, weighing equal amounts of organosilicon resin and silicon carbide epoxy resin, adding them into a reaction kettle for mixing and stirring, controlling the temperature of the reaction kettle at 140-160° C., stirring speed at 100-300 rpm, and stirring time at 10-25 min, to obtain an intermediate product; S102, preliminarily mixing dimethyl carbonate, titanium hydride powder, and silicon carbide-clay dense powder into a paste or paste, wherein the mass ratio of dimethyl carbonate, titanium hydride powder, and silicon carbide-clay dense powder is 1:1:1; S103, the reactor is cooled to room temperature, and the paste or paste obtained in S102 is added into the reactor and stirred with the intermediate product at a stirring speed of 100 to 300 rpm; S2. Preparation of coating Resin material, pigment, filler, propylene carbonate, benzyl alcohol, adipic acid dihydrazide, modified acrylic ester leveling agent, hydroxypropyl methylcellulose and water are mixed in a reaction kettle according to proportion to obtain an acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating.

6. The method for preparing the acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to claim 5, characterized in that: The method for preparing the silicon carbide-clay dense powder comprises the following steps: The silicon carbide powder and the clay powder are mixed in a mass ratio of (60-80): (20-40), wherein the average particle size of the silicon carbide powder is 0.5-10 μm; and the average particle size of the clay powder is 1-5 μm; adding an organic binder and water to the mixed powder, and mixing them evenly to form a green body; The green body is placed in a sintering furnace and sintered in a protective atmosphere at a sintering temperature of 1350°C to 1700°C, a heating rate of 1 to 5°C / min, and a holding time of 0.5 to 3h; The sintered product is taken out and crushed, and the particle size after crushing is nano-scale powder.

7. The method for preparing the acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to claim 6, characterized in that: The protective atmosphere is nitrogen, argon or a mixed gas thereof, and the gas flow rate is 10 to 50 L / min.

8. The method for preparing the acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to claim 6, characterized in that: The organic binder is any one of epoxy resin, carboxymethyl cellulose and polyacrylamide.

9. The method for preparing the acid-resistant and high-temperature-resistant silicon-based epoxy elastic anticorrosive coating according to claim 5, characterized in that: The mass of the paste or ointment is 8% to 12% of the intermediate product.

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