A water-based anticorrosive paint and a production process thereof

Abstract

The application belongs to the technical field of anticorrosive paint and particularly relates to a water-based anticorrosive paint and a production process thereof; the water-based anticorrosive paint is composed of the following raw materials in parts by weight: sodium silicate 10-15 parts, silica sol 10-25 parts, silicone base 8-12 parts, modified zinc-aluminum powder 60-70 parts, DMAP catalyst 0.02-0.03 parts, dispersant 0.5-1 part, curing agent 2-5 parts, thickening agent 1-1.5 parts and deionized water 15-20 parts. The water-based anticorrosive paint prepared by the application has good mechanical strength and excellent anticorrosive performance; and the problem of unsatisfactory anticorrosive performance caused by poor water resistance and easy cracking of the water-based paint is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of anti-corrosion coating technology, specifically relating to a water-based anti-corrosion coating and its production process. Background Technology

[0002] Metal corrosion refers to the damage to metallic materials caused by the action of the surrounding medium. The simplest, most efficient, and widely used method for metal corrosion protection is to apply a protective coating, which isolates the metal material from the surrounding corrosive medium, thereby preventing corrosion.

[0003] Currently, most anti-corrosion coatings are oil-based organic or inorganic, but they contain large amounts of heavy metals and organic solvents, which are harmful to human health and the environment. Therefore, the use of water-based coatings, which use water as a solvent and do not contain polluting organic solvents, is increasing year by year. Water-based coatings are environmentally friendly and have excellent anti-corrosion properties.

[0004] Chinese patent application CN105086701A discloses a modified waterborne anticorrosive coating. In the coating preparation process, a bis(dioctyloxypyrophosphate) ethylene titanate amine salt chelate coupling agent is added to improve the compatibility between zinc powder and silicate, enhance the adhesion of the coating, and thus prepare a zinc-rich waterborne anticorrosive coating with high adhesion.

[0005] However, water-based coatings often have drawbacks such as brittle coatings, poor impact resistance, and easy cracking, which affect the use and promotion of this type of coating. Summary of the Invention

[0006] Existing water-based coatings suffer from problems such as poor impact resistance and easy cracking. In order to solve this problem, the present invention provides a water-based anti-corrosion coating and its production process.

[0007] To achieve the objectives of this invention, the following technical solution is adopted:

[0008] In a first aspect, the present invention provides a water-based anti-corrosion coating, which is composed of the following raw materials: by weight, 10-15 parts sodium silicate, 10-25 parts silica sol, 8-12 parts organosilicon base, 60-70 parts modified zinc-aluminum powder, 0.02-0.03 parts DMAP catalyst, 0.5-1 part dispersant, 2-5 parts curing agent, 1-1.5 parts thickener, and 15-20 parts deionized water.

[0009] Preferably, the method for preparing the organosilicon-based material includes the following steps:

[0010] (1) Under the protection of an inert gas, magnesium and methyltrichlorosilane react in tetrahydrofuran solvent with the initiation of iodine to obtain solution A;

[0011] (2) Add catalyst Ni to solution A, pass dry CO2 gas through to carry out the reaction, and after the reaction is completed, add sodium acetate to adjust the pH to obtain solution B;

[0012] (3) Under the protection of inert gas, anhydrous ethanol is slowly added dropwise to solution B, refluxed to carry out a first stage reaction, anhydrous ethanol is added again, and the temperature is raised to carry out a second stage reaction to obtain organosilicon-based material.

[0013] The reaction proceeds better with the second addition of anhydrous ethanol and the second increase in temperature.

[0014] Preferably, in step (1), the mass ratio of magnesium:methyltrichlorosilane:tetrahydrofuran is 1:5.3-6.2:5.5-6; more preferably, the magnesium is magnesium shavings; the reaction temperature is 45-50℃, and the reaction time is 15-20h; the reaction temperature should not be too high, as a high reaction temperature will hinder the reaction and is not conducive to the formation of the product.

[0015] Preferably, in step (2), the reaction temperature is 35-40℃, the reaction time is 3-4h, and the pH is 7.5-8.5.

[0016] Preferably, in step (3), by mass ratio, solution B: anhydrous ethanol = 1: 0.48-0.61; the first stage reaction temperature is 15-20℃, and the first stage reaction time is 40-50min; by mass ratio, solution B: added anhydrous ethanol = 1: 0.23-0.29, the second stage reaction temperature is 60-65℃, and the second stage reaction time is 35-40min.

[0017] Preferably, the modified zinc-aluminum powder is prepared as follows:

[0018] Flake zinc powder, spherical zinc powder, and flake aluminum powder are mixed evenly to obtain metal powder. Anhydrous ethanol, sodium dodecyl sulfate, and water are added to the metal powder for dispersion. After even dispersion, a silane coupling agent is added for reaction, followed by drying and grinding to obtain the final product.

[0019] Preferably, the flaky zinc powder has a particle size of 400-450 mesh, the spherical zinc powder has a particle size of 1400-1500 mesh, and the flaky aluminum powder has a particle size of 650-750 mesh.

[0020] Preferably, the silane coupling agent is one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

[0021] Preferably, by mass ratio, the ratio of flake zinc powder: spherical zinc powder: flake aluminum powder is 1:2.5-2.9:0.6-0.8; by mass ratio, the ratio of metal powder: sodium dodecyl sulfate: silane coupling agent is 1:0.001-0.003:0.1-0.2; the dispersion temperature is 45-50℃, and the reaction time is 10-15h.

[0022] Secondly, the present invention provides a production process for the above-mentioned water-based anti-corrosion coating, comprising the following steps:

[0023] Add sodium silicate and water to a container, then slowly add silica sol, stirring at 130-150 rpm and at a reaction temperature of 65-75°C for 30-40 minutes. Then add dispersant and organosilicon base material, and add modified zinc-aluminum powder in 2-3 batches. Adjust the pH to 1.5-2.5, increase the stirring speed to 300-320 rpm, and react for 1.5-2 hours. Finally, add curing agent, thickener, and DMAP catalyst, continue stirring, and allow to cool to obtain a water-based anti-corrosion coating.

[0024] The dispersant used in this invention is a commonly used dispersant in coatings and is not particularly limited, such as polyethylene glycol, dipropylene glycol, etc.; the thickener used in this invention is a commonly used thickener in coatings and is not particularly limited, such as methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, etc.; the curing agent used in this invention is a commonly used curing agent in coatings and is not particularly limited, such as diethylenetriamine, dimethylaminopropylamine, etc.

[0025] The organosilicon base material prepared by this invention hydrolyzes in aqueous solution to Me(OH)2Si-COOH (CH3(OH)2Si-COOH), and sodium silicate and silica sol hydrolyze in aqueous solution to Si(OH)4. The two hydrolysis products undergo dehydration condensation crosslinking to form a network structure, thereby introducing ester hydrophobic groups into the Si-O network and improving the flexibility and hydrophobicity of the coating.

[0026] Hydration reaction of sodium silicate and silica sol:

[0027] ;

[0028] Hydration reaction of organosilicon-based materials:

[0029] ;

[0030] Crosslinking process:

[0031] .

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] (1) The organosilicon base material prepared in this invention inserts weak rigid bonds such as Si-C and CO into the Si-O cross-linked network formed by its hydrolysis products with sodium silicate and silica sol, thereby improving the network flexibility; ordinary inorganic coatings often have poor water resistance, and the introduced ester hydrophobic groups can improve this situation.

[0034] (2) The modified zinc-aluminum powder prepared by the present invention is grafted with organosilicon base material to form a composite structure. During film formation, metal powders of different morphologies interpenetrate with each other to form a slipperable sheet-sphere-sheet metal structure. When subjected to external pressure and solvent removal and curing of the coating, the metal powders slip, which reduces the influence of internal stress on the uniformity of the film layer and enhances the fluidity of the film layer. At the same time, the interpenetrating and filling arrangement structure between metal powders of different morphologies can prevent external water from penetrating and migrating into the coating, which can extend the service life of the coating and protect the coating from external moisture, further improving the hydrophobic effect.

[0035] (3) The water-based anti-corrosion coating prepared by the present invention has good mechanical strength and excellent anti-corrosion performance; it effectively improves the problem of unsatisfactory anti-corrosion performance caused by poor water resistance and easy cracking of water-based coatings. Detailed Implementation

[0036] The technical solution of the present invention will be explained in detail below with reference to several representative embodiments.

[0037] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0038] Example 1

[0039] A water-based anti-corrosion coating is composed of the following raw materials:

[0040] By weight, the composition is as follows: 10 parts sodium silicate, 20 parts silica sol, 9 parts organosilicon base, 60 parts modified zinc-aluminum powder, 0.02 parts DMAP catalyst, 0.5 parts polyethylene glycol, 3 parts diethylenetriamine, 1.5 parts methylcellulose, and 15 parts deionized water.

[0041] The preparation method of the organosilicon-based material includes the following steps:

[0042] (1) Add 4.86 g of magnesium shavings to a four-necked flask, introduce argon gas into the system at 45 °C, then add 0.2 g of iodine to the four-necked flask, heat the flask to fill it with iodine vapor, mix 25.76 g of methyltrichlorosilane and 28.36 g of tetrahydrofuran evenly, and slowly add the mixture dropwise to the four-necked flask through a titration funnel. Stir at 20 r / min and react for 20 h to obtain solution A.

[0043] (2) Add 0.02g Ni as a catalyst to 60g solution A, pass dry CO2 gas through and react at 36℃ for 3h. After the reaction is completed, add sodium acetate powder and adjust the pH to 7.5 to obtain solution B.

[0044] (3) 26.74g of anhydrous ethanol was slowly added dropwise to 55.69g of solution B. Argon gas was introduced to purge the CO2 in step (2). The first stage reaction was carried out at 15℃. After reflux for 40min, 16.15g of anhydrous ethanol was added. The temperature was raised to 62℃ for the second stage reaction. The reaction was carried out for 35min. The solution was then distilled under reduced pressure and dried to obtain the organosilicon-based material.

[0045] The preparation method of the modified zinc-aluminum powder includes the following steps:

[0046] 450-mesh flake zinc powder, 1500-mesh spherical zinc powder, and 650-mesh flake aluminum powder were mixed evenly in a mass ratio of 1:2.5:0.75 to obtain metal powder. Argon gas was introduced into a four-necked flask to purge the air. 60 mL of anhydrous ethanol, 0.005 g of sodium dodecyl sulfate, and 25 mL of water were added to 5 g of metal powder and dispersed at 45 °C. After even dispersion, 0.5 g of silane coupling agent KH550 was added, and the reaction was carried out for 10 h. The mixture was then dried and ground to obtain modified zinc-aluminum powder.

[0047] The production process of the above-mentioned water-based anti-corrosion coatings is as follows:

[0048] Sodium silicate was poured into a container and dissolved in deionized water. The stirring speed was 135 r / min, and then silica sol was slowly added. The reaction temperature was 70℃, and the reaction was carried out for 35 min. Then polyethylene glycol and organosilicon base were added, and modified zinc-aluminum powder was added in two batches. The pH was adjusted to 1.5 with 2 mol / L hydrochloric acid, and the stirring speed was increased to 310 r / min. The reaction was carried out for 1.5 h. Finally, diethylenetriamine, methylcellulose, and DMAP catalyst were added and stirring was continued. The mixture was allowed to stand and cool to room temperature to obtain a water-based anti-corrosion coating.

[0049] Example 2

[0050] A water-based anti-corrosion coating is composed of the following raw materials:

[0051] By weight, the composition is as follows: 12 parts sodium silicate, 15 parts silica sol, 8 parts organosilicon base, 65 parts modified zinc-aluminum powder, 0.02 parts DMAP catalyst, 1 part dipropylene glycol, 2 parts dimethylaminopropylamine, 1 part ethyl cellulose, and 15 parts deionized water.

[0052] The preparation method of the organosilicon-based material includes the following steps:

[0053] (1) Add 4.86 g of magnesium shavings to a four-necked flask, introduce argon gas into the system at 50 °C, then add 0.2 g of iodine to the four-necked flask, heat the flask to fill it with iodine vapor, mix 26.73 g of methyltrichlorosilane and 29.16 g of tetrahydrofuran evenly, and slowly add the mixture to the four-necked flask through a titration funnel. Stir at 20 r / min and react for 20 h to obtain solution A.

[0054] (2) Add 0.02g Ni as catalyst to 60g solution A, pass dry CO2 gas through and react at 35℃ for 3.5h. After the reaction is completed, add sodium acetate powder and adjust the pH to 7.5 to obtain solution B.

[0055] (3) 27.85g of anhydrous ethanol was slowly added dropwise to 55.69g of liquid B. Argon gas was introduced to purge the CO2 in step (2). The first stage reaction was carried out at 18℃. After reflux for 45min, 15.04g of anhydrous ethanol was added. The temperature was raised to 60℃ for the second stage reaction. The reaction was carried out for 40min. The mixture was then distilled under reduced pressure and dried to obtain the organosilicon-based material.

[0056] The preparation method of the modified zinc-aluminum powder includes the following steps:

[0057] 420-mesh flake zinc powder, 1450-mesh spherical zinc powder, and 700-mesh flake aluminum powder were mixed evenly in a mass ratio of 1:2.6:0.8 to obtain metal powder. Argon gas was introduced into a four-necked flask to purge the air. 60 mL of anhydrous ethanol, 0.005 g of sodium dodecyl sulfate, and 25 mL of water were added to 5 g of metal powder and dispersed at 50 °C. After even dispersion, 0.75 g of silane coupling agent KH560 was added, and the reaction was carried out for 12 h. The mixture was then dried and ground to obtain modified zinc-aluminum powder.

[0058] The production process of the above-mentioned water-based anti-corrosion coatings is as follows:

[0059] Sodium silicate was poured into a container and dissolved in deionized water. The stirring speed was 130 r / min, and then silica sol was slowly added. The reaction temperature was 75℃, and the reaction was carried out for 30 min. Then dipropylene glycol and organosilicon base were added, and modified zinc-aluminum powder was added in 3 batches. The pH was adjusted to 2 with 2 mol / L hydrochloric acid, and the stirring speed was increased to 315 r / min. The reaction was carried out for 2 h. Finally, dimethylaminopropylamine, ethyl cellulose, and DMAP catalyst were added and stirring was continued. The mixture was allowed to stand and cool to room temperature to obtain a water-based anti-corrosion coating.

[0060] Example 3

[0061] A water-based anti-corrosion coating is composed of the following raw materials:

[0062] By weight, the composition is as follows: 12 parts sodium silicate, 25 parts silica sol, 10 parts organosilicon base, 70 parts modified zinc-aluminum powder, 0.03 parts DMAP catalyst, 0.8 parts polyethylene glycol, 4 parts dimethylaminopropylamine, 1 part hydroxymethyl cellulose, and 20 parts deionized water.

[0063] The preparation method of the organosilicon-based material includes the following steps:

[0064] (1) Add 4.86 g of magnesium shavings to a four-necked flask, introduce argon gas into the system at 47 °C, then add 0.2 g of iodine to the four-necked flask, heat the flask to fill it with iodine vapor, mix 29.16 g of methyltrichlorosilane and 26.73 g of tetrahydrofuran evenly, and slowly add the mixture dropwise to the four-necked flask through a titration funnel. Stir at 20 r / min and react for 15 h to obtain solution A.

[0065] (2) Add 0.02g Ni as a catalyst to 60g solution A, pass dry CO2 gas through and react at 38℃ for 4h. After the reaction is completed, add sodium acetate powder and adjust the pH to 8.5 to obtain solution B.

[0066] (3) 33.97g of anhydrous ethanol was slowly added dropwise to 55.69g of liquid B. Argon gas was introduced to purge the CO2 in step (2). The first stage reaction was carried out at 20℃. After reflux for 45min, 12.81g of anhydrous ethanol was added. The temperature was raised to 65℃ for the second stage reaction. The reaction was carried out for 40min. The mixture was then distilled under reduced pressure and dried to obtain the organosilicon-based material.

[0067] The preparation method of the modified zinc-aluminum powder includes the following steps:

[0068] 400-mesh flake zinc powder, 1480-mesh spherical zinc powder, and 700-mesh flake aluminum powder were mixed evenly in a mass ratio of 1:2.9:0.6 to obtain metal powder. Argon gas was introduced into a four-necked flask to purge the air. 60 mL of anhydrous ethanol, 0.01 g of sodium dodecyl sulfate, and 25 mL of water were added to 5 g of metal powder and dispersed at 45 °C. After even dispersion, 0.5 g of silane coupling agent KH550 was added, and the reaction was carried out for 15 h. The mixture was then dried and ground to obtain modified zinc-aluminum powder.

[0069] The production process of the above-mentioned water-based anti-corrosion coatings is as follows:

[0070] Sodium silicate was poured into a container and dissolved in deionized water. The stirring speed was 140 r / min, and then silica sol was slowly added. The reaction temperature was 65℃, and the reaction was carried out for 40 min. Then polyethylene glycol and organosilicon base were added, and modified zinc-aluminum powder was added in 3 batches. The pH was adjusted to 1.5 with 2 mol / L hydrochloric acid, and the stirring speed was increased to 320 r / min. The reaction was carried out for 2 h. Finally, dimethylaminopropylamine, hydroxymethyl cellulose, and DMAP catalyst were added and stirring was continued. The mixture was allowed to stand and cool to room temperature to obtain a water-based anti-corrosion coating.

[0071] Example 4

[0072] A water-based anti-corrosion coating is composed of the following raw materials:

[0073] By weight, the composition is as follows: 15 parts sodium silicate, 10 parts silica sol, 12 parts organosilicon base, 68 parts modified zinc-aluminum powder, 0.03 parts DMAP catalyst, 0.6 parts dipropylene glycol, 5 parts diethylenetriamine, 1.2 parts hydroxyethyl cellulose, and 20 parts deionized water.

[0074] The preparation method of the organosilicon-based material includes the following steps:

[0075] (1) Add 4.86g of magnesium shavings to a four-necked flask, introduce argon gas into the system at 48℃, then add 0.2g of iodine to the four-necked flask, heat the flask to fill it with iodine vapor, mix 30.13g of methyltrichlorosilane with 27.88g of tetrahydrofuran until homogeneous, and slowly add the mixture dropwise to the four-necked flask through a titration funnel. Stir at 20r / min and react for 18h to obtain solution A.

[0076] (2) Add 0.02g Ni as a catalyst to 60g solution A, pass dry CO2 gas through and react at 40℃ for 3.5h. After the reaction is completed, add sodium acetate powder and adjust the pH to 8 to obtain solution B.

[0077] (3) 30.63g of anhydrous ethanol was slowly added dropwise to 55.69g of liquid B. Argon gas was introduced to purge the CO2 in step (2). The first stage reaction was carried out at 15℃. After reflux for 50min, 13.92g of anhydrous ethanol was added. The temperature was raised to 65℃ for the second stage reaction. The reaction was carried out for 38min. The mixture was then distilled under reduced pressure and dried to obtain the organosilicon-based material.

[0078] The preparation method of the modified zinc-aluminum powder includes the following steps:

[0079] 400-mesh flake zinc powder, 1500-mesh spherical zinc powder, and 750-mesh flake aluminum powder were mixed evenly in a mass ratio of 1:2.5:0.8 to obtain metal powder. Argon gas was introduced into a four-necked flask to purge the air. 60 mL of anhydrous ethanol, 0.015 g of sodium dodecyl sulfate, and 25 mL of water were added to 5 g of metal powder and dispersed at 50 °C. After even dispersion, 1 g of silane coupling agent KH570 was added, and the reaction was carried out for 10 h. The mixture was then dried and ground to obtain modified zinc-aluminum powder.

[0080] The production process of the above-mentioned water-based anti-corrosion coatings is as follows:

[0081] Sodium silicate was poured into a container and dissolved in deionized water. The stirring speed was 150 r / min, and then silica sol was slowly added. The reaction temperature was 60℃, and the reaction was carried out for 35 min. Then dipropylene glycol and organosilicon base were added, and modified zinc-aluminum powder was added in two batches. The pH was adjusted to 2.5 with 2 mol / L hydrochloric acid, and the stirring speed was increased to 300 r / min. The reaction was carried out for 1.5 h. Finally, diethylenetriamine, hydroxyethyl cellulose, and DMAP catalyst were added and stirring was continued. The mixture was allowed to stand and cool to room temperature to obtain a water-based anti-corrosion coating.

[0082] Relevant performance tests: The water resistance of water-based anti-corrosion coatings was determined according to GB / T 1733-1993 "Determination of Water Resistance of Paint Films"; the alkali resistance of water-based anti-corrosion coatings was determined according to GB / T 9265–2009 "Determination of Alkali Resistance of Architectural Coatings"; the salt spray resistance of water-based anti-corrosion coatings was determined according to GB / T 1771-2007 "Determination of Neutral Salt Spray Resistance of Paints and Varnishes"; the flexibility of water-based anti-corrosion coatings was determined according to GB / T 1731-2020 "Determination of Flexibility of Paint Films and Putty Films"; the impact resistance of water-based anti-corrosion coatings was determined according to GB / T1732-2020 "Determination of Impact Resistance of Paint Films"; and the adhesion of water-based anti-corrosion coatings was determined according to B / T 9286-1998 "Cross-cut Test of Paint Films and Varnishes".

[0083] The test results of Examples 1-4 are shown in Table 1.

[0084] Table 1 Test Results

[0085]

[0086] The water-based anti-corrosion coating prepared by this invention has excellent corrosion resistance and mechanical properties.

[0087] Comparative Example 1

[0088] A water-based anti-corrosion coating differs from Example 1 in the preparation of the metal powder in the modified zinc-aluminum powder, as detailed in Table 2. The preparation method of the modified zinc-aluminum powder and the remaining formulations and preparation methods of the water-based anti-corrosion coating are the same as in Example 1. The relevant test results are shown in Table 3.

[0089] Table 2 Preparation of metal powders

[0090]

[0091] Comparative Example 2

[0092] A water-based anti-corrosion coating, which differs from Example 1 in that no organosilicon base material is added, but the rest of the formulation and preparation method of the water-based anti-corrosion coating are the same as those of Example 1, and is denoted as D4. The relevant test results are shown in Table 3.

[0093] A water-based anti-corrosion coating differs from Example 1 in that an equal amount of methyltrichlorosilane is used instead of the organosilicon base material. The rest of the formulation and preparation method are the same as in Example 1. This coating is designated as D5. The relevant test results are shown in Table 3.

[0094] The test results of Comparative Examples 1 and 2 are shown in Table 3.

[0095] Table 3 Test Results

[0096]

[0097] The comparison of the test results of Example 1 and D1-D3 in Table 3 shows that the modified zinc-aluminum powder prepared by the present invention has a significant impact on the water resistance, impact resistance, and salt spray resistance of the coating. The modified zinc-aluminum powder prepared by the present invention has a sheet-sphere-lamella structure. The interlacing and filling arrangement of metal powders with different morphologies can prevent external water from penetrating and migrating into the coating, thus enhancing the hydrophobic effect of the coating. At the same time, this structure increases the slippage ability of the coating, ensuring that the coating is not prone to cracking when subjected to external environment and its own internal stress.

[0098] The comparison of the test results of Example 1 and D4-D5 in Table 3 shows that the organic [product / process] prepared by this invention...

[0099] Silicon-based materials have a significant impact on the water resistance and flexibility of coatings. The rigid network structure of Si-O bonds in silicates is the main reason why water-based coatings are brittle. The organosilicon-based material of this invention inserts weak rigid bonds such as Si-C and CO into the Si-O network to improve the flexibility of the crosslinking network. At the same time, the hydrophobic ester groups introduced can further improve the hydrophobicity of the material by shielding water.

[0100] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A water-based anti-corrosion coating, characterized in that, The water-based anti-corrosion coating is composed of the following raw materials: by weight, 10-15 parts sodium silicate, 10-25 parts silica sol, 8-12 parts organosilicon base, 60-70 parts modified zinc-aluminum powder, 0.02-0.03 parts DMAP catalyst, 0.5-1 part dispersant, 2-5 parts curing agent, 1-1.5 parts thickener, and 15-20 parts deionized water; The preparation method of the organosilicon base material includes the following steps: (1) under the protection of inert gas, magnesium and methyltrichlorosilane react in tetrahydrofuran solvent under the initiation of iodine to obtain solution A; (2) add catalyst Ni to solution A, pass dry CO2 gas through to carry out the reaction, and after the reaction is completed, add sodium acetate to adjust the pH to obtain solution B; (3) under the protection of inert gas, slowly add anhydrous ethanol to solution B, reflux to carry out a first stage reaction, add anhydrous ethanol, raise the temperature to carry out a second stage reaction to obtain organosilicon base material; The modified zinc-aluminum powder is prepared as follows: flaky zinc powder, spherical zinc powder, and flaky aluminum powder are mixed evenly to obtain metal powder. Anhydrous ethanol, sodium dodecyl sulfate, and water are added to the metal powder for dispersion. After even dispersion, a silane coupling agent is added for reaction. The mixture is then dried and ground to obtain modified zinc-aluminum powder.

2. The water-based anti-corrosion coating according to claim 1, characterized in that, In step (1), the mass ratio of magnesium to methyltrichlorosilane to tetrahydrofuran is 1:5.3-6.2:5.5-6; the reaction temperature is 45-50℃ and the reaction time is 15-20h.

3. The water-based anti-corrosion coating according to claim 1, characterized in that, In step (2), the reaction temperature is 35-40℃, the reaction time is 3-4h, and the pH is 7.5-8.

5.

4. The water-based anti-corrosion coating according to claim 1, characterized in that, In step (3), by mass ratio, solution B: anhydrous ethanol = 1: 0.48-0.61; the first stage reaction temperature is 15-20℃, and the first stage reaction time is 40-50min; by mass ratio, solution B: added anhydrous ethanol = 1: 0.23-0.29, the second stage reaction temperature is 60-65℃, and the second stage reaction time is 35-40min.

5. The water-based anti-corrosion coating according to claim 1, characterized in that, The flaky zinc powder has a particle size of 400-450 mesh, the spherical zinc powder has a particle size of 1400-1500 mesh, and the flaky aluminum powder has a particle size of 650-750 mesh.

6. The water-based anti-corrosion coating according to claim 1, characterized in that, The silane coupling agent is one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

7. The water-based anti-corrosion coating according to claim 1, characterized in that, The mass ratio of flaky zinc powder to spherical zinc powder to flaky aluminum powder is 1:2.5-2.9:0.6-0.8; the mass ratio of metal powder to sodium dodecyl sulfate to silane coupling agent is 1:0.001-0.003:0.1-0.2; the dispersion temperature is 45-50℃, and the reaction time is 10-15h.

8. A production process for the water-based anti-corrosion coating according to any one of claims 1-7, characterized in that, Includes the following steps: Add sodium silicate and water to a container, then slowly add silica sol, stirring at 130-150 rpm and at a reaction temperature of 65-75°C for 30-40 minutes. Then add dispersant and organosilicon base material, and add modified zinc-aluminum powder in 2-3 batches. Adjust the pH to 1.5-2.5, increase the stirring speed to 300-320 rpm, and react for 1.5-2 hours. Finally, add curing agent, thickener, and DMAP catalyst, continue stirring, and allow to cool to obtain a water-based anti-corrosion coating.

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