CN108395743A - Method for preparing environment-friendly water-based ceramic coating - Google Patents

Abstract

The invention discloses a method for preparing an environment-friendly water-based ceramic coating. The environment-friendly water-based ceramic silicate coating is composed of a base material, a filler, deionized water and an auxiliary agent, wherein the base material is mainly liquid silicate , the main component of the filler is aluminum powder, and the aluminum powder has been pretreated, which greatly improves the stability of the coating; the selected additives are mainly coupling agents, corrosion inhibitors, thixotropic agents, surfactants, Antifoaming agent, etc., an environmentally friendly water-based ceramic coating was prepared by stirring and sanding. The coating of the invention has the characteristics of environment-friendliness, non-toxicity, no pungent smell, low VOC emission, simple construction process, and can be widely used in various fields. The coating of the present invention has good surface adaptability to the substrate, strong coating adhesion, good metallic luster, self-repairing, high temperature resistance, salt spray resistance, wear resistance, corrosion resistance, thermal shock resistance, antistatic, Anti-mildew, water resistance and other properties.

Description

A kind of method for preparing environment-friendly water-based ceramic paint

technical field

The invention relates to the field of building decoration materials, in particular to a method for preparing an environment-friendly water-based ceramic silicate coating.

Background technique

In recent years, with the rapid development of social economy, the demand for metal materials such as steel has been increasing in various fields. However, metal materials such as steel are affected by various environments, and there are a lot of corrosion phenomena, which seriously damage natural resources. And the environment, but also brought a huge potential threat to people's lives, hindering the full utilization of metal materials such as steel, including oil, natural gas, electric power and other energy industries, bridges, roads and other transportation industries, petrochemical, fine chemical, Chemical industries such as pharmaceuticals and other industries such as urban construction, agriculture, and ocean development. Corrosion of steel and other metal materials causes economic and environmental losses all the time. A large number of precious resources are lost due to corrosion. At the same time, it also poses a serious threat to safe production and restricts the development of heavy industry. Therefore, steel and other metals Corrosion of materials is a problem that cannot be underestimated.

The easiest way to prevent corrosion of metal materials such as steel is to apply a layer of paint on the surface of the metal material. At present, the paint on the domestic market is still dominated by solvent-based paint. However, solvent-based coatings emit a large amount of organic volatile compounds (VOC) in the process of production, construction, drying, and curing to form a film. Nowadays, people's awareness of environmental protection is getting stronger and stronger, and it is particularly important to develop low-VOC environmentally friendly green coating products.

Meng Tao and others made it with SiO ₂ , K ₂ O molar ratio 5.7:1, potassium silicate, silica sol, montmorillonite gel 2%~4%, silane coupling agent, deionized water, pigments, additives, etc. Water-based ceramic coatings. It has good adhesion, good water resistance, wear resistance and other properties. Mason has prepared a kind of dark paint for automobile glass and architectural glass with water-soluble sodium silicate, water, and fine metal oxides, which are used to protect devices exposed to sunlight. Chen Huashan, etc. used water-based epoxy resin emulsion, water, thickener, film-forming aid, defoamer, dispersant, coupling agent, etc. as component A; water-based epoxy curing agent, water as component B, Mix components A and B at a mass ratio of 6.6:1, and stir thoroughly to obtain a water-based anti-corrosion coating. The coating has the characteristics of safety, environmental protection, simple process, low cost, excellent corrosion resistance and the like.

Solvent-based coatings are commonly used now, but solvent-based coatings use a large amount of organic solvents in production and have a relatively high level of VOC emissions, causing environmental pollution, energy waste, and high production and processing costs. Moreover, some harmful solvents will volatilize during the production and painting process and after painting, which will have a harmful impact on human health.

Water-based ceramic coating is an environmentally friendly coating that does not contain organic solvents at all. It is a high-performance innovative coating that is completely green and environmentally friendly, and has excellent wear resistance and water resistance, salt water resistance, oil resistance, high temperature resistance, and salt spray resistance. Non-toxicity, anti-pollution, anti-toxicity, flame retardancy, radiation resistance, self-healing, ultra-abrasion resistance, impact resistance and other special properties that are impossible to achieve with any organic product. At present, the domestic market is very small.

Contents of the invention

The object of the present invention is to provide a method for preparing an environment-friendly water-based ceramic paint. The paint of the present invention has high stability and can be cured to form a film at a certain temperature. The coating film has superior metallic luster, strong adhesion, salt spray corrosion resistance, water resistance, impact resistance, wear resistance and thermal shock resistance.

The technical solution adopted in the present invention is to provide an environment-friendly water-based ceramic silicate coating, the environment-friendly water-based ceramic silicate coating is composed of a base material, a filler, deionized water, and an auxiliary agent, wherein the base material It is liquid silicate, the main component of the filler is aluminum powder, and the selected additives are mainly coupling agent, corrosion inhibitor, thixotropic agent and surfactant;

The base material is liquid sodium silicate and silica sol, the contents of which are 57.50-67.50 parts of liquid sodium silicate and 4.25-8.25 parts of silica sol per 100 parts of water;

The content of the filler is 50.38-68.38 parts per 100 parts of water, wherein the filler includes the following components by weight: 1.50-3.50 parts of aluminum tripolyphosphate, 1.38-2.38 parts of magnesium oxide, 2.00- 3.00 parts of silicon dioxide, 6.75-10.75 parts of zinc powder, 38.75-48.75 parts of aluminum powder;

The content of the auxiliary agent is 4.57-8.37 parts per 100 parts of water, wherein the auxiliary agent includes the following components in parts by weight: 1.75-2.75 parts of silane coupling agent kh560, 0.75-1.35 parts of silicon Magnesium aluminum acid; 1.19-2.19 parts of water-soluble imidazoline, 0.55-1.15 parts of sodium lauryl amphoacetate, 0.33-0.93 parts of tributyl phosphate.

In a preferred embodiment of the present invention, the content of the liquid sodium silicate is 40%, and the modulus is 4.3; the content of the silica sol is 23%, and the content of the water-soluble imidazoline is 20%, so The content of the sodium laurylamphoacetate is 20%, the purity of the tributyl phosphate is 99%, the particle diameter of the magnesium aluminum silicate is 2-3um, and the particle diameter of the aluminum tripolyphosphate is 2-3um, the purity of the magnesium oxide is 98%, the particle diameter of the silicon dioxide is 15nm, the aluminum powder is spherical aluminum powder and the particle diameter is 8-10um, and the particle diameter of the zinc powder is 9 -10um.

The excellent effect of the present invention is: for the aluminum powder will react with the base material in the coating, thereby affecting the stability of the coating, the present invention uses coupling agent and carboxymethyl cellulose to coat the aluminum powder, and the To a certain extent, the stability of the coating is improved. Liquid silicate is used as the main base material, aluminum powder is used as the main filler, and various additives are used together. Under the combined action, it has the characteristics of non-toxicity, no pungent smell, environment-friendly, low VOC emission content, simple construction process, and can be widely used in various fields. The formed coating film not only has superior metallic luster, but also has strong adhesion, salt spray corrosion resistance, water resistance, impact resistance, abrasion resistance and thermal shock resistance, and belongs to water-based coatings.

Detailed ways

The preferred embodiments of the present invention are described in detail below to make the advantages and features of the present invention easier to be understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

Example 1

Preparation of aluminum powder treated with titanate coupling agent (Cs-311)

Weigh 200g of aluminum powder (particle size 8-10um), introduce it into a large beaker with 400ml of absolute ethanol 1L, cut it with a high-speed shear for 6 minutes, and add 2g of titanate coupling agent drop by drop (CS-311) was further sheared for 4 minutes, then transferred to a 1L round-bottomed flask, and rotatated in a water bath at 60°C for 7 hours. The rotation speed of the evaporator was adjusted to 45r/min, and it was completed after 7 hours. Coupling processing.

Start the circulating water vacuum pump for decompression drying. When all the liquid in the round bottom flask has evaporated, turn off the circulating water vacuum pump to stop the decompression drying, add 100ml of absolute ethanol to the round bottom flask, stir well and then turn on the circulating water again Dry under reduced pressure with a vacuum pump; when the absolute ethanol is completely evaporated, transfer the aluminum powder that has been treated with the coupling agent in the round bottom flask to a 250ml beaker, and then place the entire beaker in a drying oven at 70°C to dry for 12 hours. Obtain completely dry block aluminum powder, fully grind it with a mortar, pass through a 200-mesh sieve, and immediately seal and store it to obtain a coupling agent-treated aluminum powder.

Preparation of environment-friendly water-based ceramic coating

Weigh 80g of deionized water into a 250ml beaker, stir under a mechanical stirrer (230r/min), weigh 45g of liquid sodium silicate and 5g of silica sol, add them to the stirring deionized water in turn, and stir well After that; weigh 1.80g KH-560, drop it slowly drop by drop, and stir evenly; respectively weigh 0.84g magnesium aluminum silicate, 2g aluminum tripolyphosphate, 1.50g magnesium oxide, 2g silicon dioxide, 7g zinc powder, Add 28g of aluminum powder (pretreated) to it one by one. After fully stirring at room temperature for 6 hours, sand the paint in a sand mill for 15 minutes. The speed of the sand mill is 800r/min, and pass through 300 mesh Sieve it, stir it again in a mechanical stirrer, weigh 1.35g water-soluble imidazoline, 0.68g sodium lauryl amphoacetate, and 0.50g tributyl phosphate, and add it slowly and dropwise in sequence, and continue to stir fully for 15min to obtain an environmentally friendly Water-based ceramic coatings.

Coating and Film Formation

Grind the surface of the steel substrate with sandpaper. After grinding, first take the above-mentioned part of the paint on the surface of the substrate by spraying, dipping or brushing, etc., then bake it in an oven at 60°C for 5 minutes, and finally transfer it to In a muffle furnace, it was fired at 300°C for 20 minutes to solidify and form a film.

Example 2

Preparation of aluminum powder treated with carboxymethyl cellulose

Weigh 0.5g of carboxymethyl cellulose, slowly add it to a large beaker that has weighed 300ml of deionized water and 1L, stir well until the liquid is transparent; weigh 100g of aluminum powder (particle size 8-10um) and add into the carboxymethyl cellulose solution, fully stirred for 6 hours in a water bath at 60°C, and then transferred to a centrifuge tube for centrifugation; after centrifugation, pour off the supernatant, take out the treated aluminum powder, and transfer to In a large beaker, dry under reduced pressure at 40°C for 12 hours to obtain dry block-shaped aluminum powder. After fully grinding in a mortar, pass through a 200-mesh sieve, and immediately seal and store to obtain carboxymethylcellulose-treated aluminum powder. pink.

Preparation of environment-friendly water-based ceramic coating

Weigh 70g of deionized water in a 250ml beaker, stir under a mechanical stirrer (230r/min), weigh 50g of liquid sodium silicate and 7.50g of liquid silica sol, and add them to the stirring deionized water in turn, fully After stirring evenly; weigh 0.84g of magnesium aluminum silicate, 2g of aluminum tripolyphosphate, 1g of magnesium oxide, 1.50g of silicon dioxide, and 35g of aluminum powder (pretreated), and add them in sequence, and stir well at room temperature After 6h, the coating was sand-milled in a sand mill for 15min, wherein the sand mill rotating speed was 800r/min, the coating was passed through a 180 mesh sieve, and it was stirred again in a mechanical stirrer, and 1.35g of water-soluble imidazoline, 0.68g of sodium lauryl amphoteric acetate and 0.50g of tributyl phosphate were slowly added dropwise in sequence, and the stirring was continued for 15 minutes to obtain an environmentally friendly water-based ceramic coating.

Coating and Film Formation

Use sandpaper to grind the surface of the steel substrate. After grinding, first take the above-mentioned part of the paint and spray it on the surface of the substrate in the form of spraying, bake it in an oven at 80°C for 5 minutes, take it out and wait for it to cool before spraying it for the second time , and baked in an oven at 80° C. for 5 minutes, and finally transferred to a muffle furnace, and fired at 300° C. for 30 minutes to solidify and form a film.

Example 3

Preparation of aluminum powder treated with silane coupling agent (Kh550)

Weigh 200g of aluminum powder (particle size 8-10um), introduce it into a large beaker with 400ml of absolute ethanol 1L, cut it with a high-speed shear for 6 minutes, add 1g of silane coupling agent Kh550 drop by drop, After further shearing for 10 minutes, it was transferred to a 1L round-bottomed flask, and was rotary evaporated in a water bath at 60°C for 6 hours. The rotation speed of the rotary evaporator was adjusted to 45r/min, and the coupling treatment was completed after 6 hours.

Start the circulating water vacuum pump for decompression drying. When all the liquid in the round bottom flask has evaporated, turn off the circulating water vacuum pump to stop the decompression drying, add 100ml of absolute ethanol to the round bottom flask, stir well and then turn on the circulating water again Dry under reduced pressure with a vacuum pump; when the absolute ethanol is completely evaporated, transfer the aluminum powder that has been treated with the coupling agent in the round bottom flask to a 250ml beaker, and then place the entire beaker in a drying oven at 70°C to dry for 12 hours. Obtain completely dry block aluminum powder, grind it thoroughly in a mortar, pass through a 200-mesh sieve, and immediately seal and store it to obtain aluminum powder treated with a coupling agent.

Preparation of environment-friendly water-based ceramic coating

Weigh 80g of deionized water into a 250ml beaker, stir under a mechanical stirrer (230r/min), weigh 50g of liquid sodium silicate and 7.50g of silica sol, add them to the stirring deionized water in turn, and stir fully After uniformity; weigh 1.80g KH-560, drop it slowly drop by drop, stir evenly; weigh 0.84g magnesium aluminum silicate, 2g aluminum tripolyphosphate, 1.50g magnesium oxide, 2g silicon dioxide, 35g aluminum powder (pretreated), and added to it one by one, after fully stirring at room temperature for 6 hours, sand the paint in a sand mill for 15 minutes, wherein the speed of the sand mill is 800r/min, after passing through a 180-mesh sieve, put it in the Stir again under a mechanical stirrer, weigh 1.35g water-soluble imidazoline, 0.68g sodium lauryl amphoacetate, and 0.50g tributyl phosphate, and add them slowly and dropwise in turn, and continue to fully stir for 15 minutes to prepare an environmentally friendly water-based ceramic coating.

Coating and Film Formation

Use sandpaper to grind the surface of the steel substrate. After grinding, first take the above-mentioned part of the paint on the surface of the substrate by spraying, dipping or brushing, etc., then bake it in an oven at 80°C for 5 minutes, and finally transfer it to In a muffle furnace, it was fired at 350° C. for 15 minutes to solidify and form a film.

Example 4

Preparation of aluminum powder treated with silane coupling agent (Kh570)

Weigh 200g of aluminum powder (particle size 8-10um), introduce it into a large beaker with 400ml of absolute ethanol 1L, cut it with a high-speed shear for 6 minutes, and add 1.5g of silane coupling agent Kh570 drop by drop , further sheared for 10 minutes, and then transferred to a 1L round-bottomed flask, and was rotated to evaporate in a water bath at 60°C for 8 hours. The rotation speed of the rotary evaporator was adjusted to 45r/min, and the coupling process was completed after 8 hours.

Start the circulating water vacuum pump for decompression drying. When all the liquid in the round bottom flask has evaporated, turn off the circulating water vacuum pump to stop the decompression drying, add 100ml of absolute ethanol to the round bottom flask, stir well and then turn on the circulating water again Dry under reduced pressure with a vacuum pump; when the absolute ethanol is completely evaporated, transfer the aluminum powder that has been treated with the coupling agent in the round bottom flask to a 250ml beaker, and then place the entire beaker in a drying oven at 70°C to dry for 12 hours. Obtain completely dry block aluminum powder, grind it thoroughly in a mortar, pass through a 200-mesh sieve, and immediately seal and store it to obtain aluminum powder treated with a coupling agent.

Preparation of environment-friendly water-based ceramic coating

Weigh 70g of deionized water in a 250ml beaker, stir under a mechanical stirrer (230r/min), weigh 50g of liquid sodium silicate and 7.50g of silica sol, and add them to the stirring deionized water in turn, fully After stirring evenly; weigh 1.80g KH-560, drop it slowly drop by drop, after stirring evenly, weigh 0.84g magnesium aluminum silicate, 2g aluminum tripolyphosphate, 1g magnesium oxide, 1.50g silicon dioxide, 5g Zinc powder, 30g of aluminum powder (pretreated), and added to it in turn, after fully stirring at room temperature for 6 hours, the coating was sanded in a sand mill for 15 minutes, and the speed of the sand mill was 800r/min, passing through 180 mesh Sieve, stir again in a mechanical stirrer, weigh 1.35g water-soluble imidazoline, 0.68g sodium lauryl amphoacetate, and 0.50g tributyl phosphate, and add them slowly and dropwise in sequence, and continue to stir fully for 15min to obtain an environmentally friendly water-based Ceramic coatings.

Coating and Film Formation

Use sandpaper to grind the surface of the steel substrate. After grinding, first take the above-mentioned part of the paint on the surface of the substrate by spraying, dipping or brushing, etc., then bake it in an oven at 80°C for 5 minutes, and finally transfer it to In a muffle furnace, it was fired at a temperature of 400° C. for 5 minutes to solidify and form a film.

Example 5

Preparation of Aluminum Powder Treated with Aluminate Coupling Agent

Weigh 200g of aluminum powder (particle size 8-10um), introduce it into a large beaker with 400ml of absolute ethanol 1L, cut it with a high-speed shear for 6 minutes, and add 0.5g of aluminate coupling dropwise The reagent was further sheared for 10 minutes, and then transferred to a 1L round-bottomed flask, and rotated for 8 hours in a water bath at 60°C. The rotation speed of the rotary evaporator was adjusted to 45r/min, and the coupling process was completed after 8 hours.

Start the circulating water vacuum pump for decompression drying. When all the liquid in the round bottom flask has evaporated, turn off the circulating water vacuum pump to stop the decompression drying, add 100ml of absolute ethanol to the round bottom flask, stir well and then turn on the circulating water again Dry under reduced pressure with a vacuum pump; when the absolute ethanol is completely evaporated, transfer the aluminum powder that has been treated with the coupling agent in the round bottom flask to a 250ml beaker, and then place the entire beaker in a drying oven at 70°C to dry for 12 hours. The completely dry block aluminum powder is obtained, fully ground with a mortar, passed through a 200-mesh sieve, sealed and stored immediately, and the aluminum powder treated with the coupling agent is obtained.

Preparation of environment-friendly water-based ceramic coating

Weigh 70g of deionized water in a 250ml beaker, stir under a mechanical stirrer (230r/min), weigh 50g of liquid sodium silicate and 7.50g of liquid silica sol, and add them to the stirring deionized water in turn, fully After stirring evenly; weigh 1.80g KH-560, drop it slowly drop by drop, stir evenly; weigh 0.84g magnesium aluminum silicate, 2g aluminum tripolyphosphate, 1g magnesium oxide, 1.50g silicon dioxide, 35g Aluminum powder (pretreated) was added to it one by one. After fully stirring at room temperature for 6 hours, the coating was sanded in a sand mill for 15 minutes. Stir again in a mechanical stirrer, weigh 1.35g water-soluble imidazoline, 0.68g sodium lauryl amphoacetate, and 0.50g tributyl phosphate, and add them slowly and dropwise in turn, and continue to stir fully for 15 minutes to prepare an environmentally friendly water-based ceramic coating. .

Coating and Film Formation

Use sandpaper to grind the surface of the steel substrate. After grinding, first take the above-mentioned part of the paint and spray it on the surface of the substrate in the form of spraying, bake it in an oven at 80°C for 5 minutes, take it out and wait for it to cool before spraying it for the second time , and baked in an oven at 80° C. for 5 minutes, and finally transferred to a muffle furnace, and fired at 300° C. for 30 minutes to solidify and form a film.

The above are only specific implementation examples. Obviously, the present invention is not limited to the above implementation examples, and many modifications can also be made. Those of ordinary skill in the art can directly derive or associate all deformations from the disclosed content of the invention, and all should be considered as the embodiment of the present invention. scope of protection.

Claims (6)

1. A method for preparing an environment-friendly water-based ceramic coating, characterized in that, the aluminum powder is pretreated with a coupling agent and carboxymethyl cellulose respectively: the aluminum powder is added in dehydrated alcohol, high-speed shearing, drop coupling The agent continues to shear, and the rotary evaporation in the water bath completes the coupling treatment. After drying under reduced pressure, dry in a drying oven, grind and sieve to obtain the aluminum powder treated by the coupling agent; add the aluminum powder to the carboxymethyl cellulose solution , fully stirred in a water bath, centrifuged, poured off the supernatant, dried under reduced pressure, ground and sieved to obtain aluminum powder treated with carboxymethyl cellulose; under mechanical stirring, add liquid sodium silicate and silica sol to deionized water Stir well, slowly drop into KH560 and stir well, add magnesium aluminum silicate, aluminum tripolyphosphate, magnesium oxide, silicon dioxide, zinc powder, pretreated aluminum powder and fully stir, sand mill, sieve, mechanically stir Water-soluble imidazoline, sodium lauryl amphoteric acetate, and tributyl phosphate are added dropwise, and fully stirred to obtain an environmentally friendly water-based ceramic coating; after the surface of the substrate is polished with sandpaper, the above-mentioned coating is sprayed, dipped or brushed On the surface of the steel substrate, it is baked in an oven, and then transferred to a muffle furnace to be fired and solidified to form a film. 2. a kind of method for preparing environment-friendly water-based ceramic paint according to claim 1, is characterized in that, the pretreatment of aluminum powder comprises two kinds of methods of coupling agent processing and carboxymethyl cellulose processing: Preparation of aluminum powder treated with coupling agent: Weigh 190-200 parts of aluminum powder, add 380-400 parts of absolute ethanol, shear at high speed for 6-7 minutes, add 0.5-2 parts of coupling agent dropwise, continue shearing for 8-10 minutes, and place in a water bath at 60-62°C Rotary evaporation in medium for 6-8h to complete the coupling treatment; dry under reduced pressure, add 90-100 parts of absolute ethanol to fully stir when the absolute ethanol is completely evaporated, and dry under reduced pressure again; Dry in a drying oven at -73°C for 10-12 hours to obtain a completely dry block aluminum powder, fully grind it in a mortar, and pass through a 200-mesh sieve to obtain a coupling agent-treated aluminum powder, which is immediately sealed and stored; Preparation of aluminum powder treated with carboxymethyl cellulose: Weigh 0.5-0.6 parts of carboxymethyl cellulose, slowly add it to 300-320 parts of deionized water, stir well until the liquid becomes transparent; weigh 90-100 parts of aluminum powder, add it to carboxymethyl cellulose solution , fully stirred in a water bath at 60-62°C for 5-6h, centrifuged, poured off the supernatant, and dried the treated aluminum powder at 40-42°C for 10-12h under reduced pressure to obtain dry block-shaped aluminum powder. After being fully ground in a mortar, pass through a 200-mesh sieve to obtain carboxymethyl cellulose-treated aluminum powder, which is immediately sealed and stored. 3. a kind of method for preparing environment-friendly water-based ceramic paint according to claim 1, is characterized in that, the preparation of environment-friendly water-based ceramic paint: Weigh 70-80 parts of deionized water, stir mechanically, add 45-50 parts of liquid sodium silicate, 5-7.5 parts of silica sol in sequence, and stir well; slowly add 1.7-1.8 parts of KH560 drop by drop, and stir well ; Add 0.8-0.9 parts of magnesium aluminum silicate, 1.8-2 parts of aluminum tripolyphosphate, 1-1.5 parts of magnesium oxide, 1.5-2 parts of silicon dioxide, 5-7 parts of zinc powder, 28-35 parts of pretreated After fully stirring the aluminum powder for 5-6 hours, sand it in a sand mill for 15-16 minutes, pass through a 180-300 mesh sieve, stir it again in a mechanical stirrer, and slowly add 1.3-1.4 parts of water-soluble Imidazoline, 0.6-0.7 part of sodium lauryl amphoteric acetate, 0.4-0.5 part of tributyl phosphate, and continue to fully stir for 15-17 minutes to prepare an environmentally friendly water-based ceramic coating. 4. a kind of method for preparing environment-friendly water-based ceramic paint according to claim 1, is characterized in that, coating and film-forming process: After grinding the surface of the steel base material with sandpaper, take the above-mentioned part of the paint and apply it on the surface of the steel base material by spraying, dipping or brushing, bake in an oven at 60-80°C for 4-5min, take it out and cool it, and transfer it to Fire in a muffle furnace at 300-400°C for 5-30 minutes to solidify and form a film. 5. a kind of method for preparing environment-friendly water-based ceramic paint according to claim 2, is characterized in that, aluminum powder is spherical aluminum powder and particle diameter is 8-10um, and coupling agent is titanate coupling agent (Cs -311)/silane coupling agent (kh550/kh570)/aluminate coupling agent, the rotary evaporation speed is 40-50r/min. 6. A method for preparing an environment-friendly water-based ceramic coating according to claim 3, wherein the mechanical stirring speed is 230-250r/min, and the sand mill speed is 800-900r/min.