A cold galvanizing anticorrosive paint and a preparation method thereof

Abstract

The application discloses a kind of cold galvanization anticorrosive paint and preparation method thereof, belong to steel material anticorrosion field.The paint comprises the following weight parts components: organic silicon modified acrylate emulsion 10-15 parts, high molecular type wet dispersing agent 0.5-0.8 parts, modified zinc powder 80-90 parts, thickening agent 0.4-0.6 parts, hydrophilic fumed silica 0.6-0.9 parts, deionized water 5-8 parts. Among them, organic silicon modified acrylate emulsion is prepared by pre-emulsion, seed emulsion synthesis and adding monovinyl terminated polydimethylsiloxane reaction;Modified zinc powder is modified by silane coupling agent KH570 treatment.The application adds polydimethylsiloxane long chain modified water-based acrylic emulsion, cooperates with high molecular type wet dispersing agent, hydrophilic fumed silica anti-sediment agent, fully plays the role of each component, through the synergistic effect of "multiple steric hindrance + three-dimensional network structure", significantly improves the long-term storage stability of paint, improves the salt fog resistance of coating, and is suitable for steel structure building material rust prevention and galvanized component maintenance and other scenes.

Description

Technical Field

[0001] This invention relates to the field of corrosion protection for steel materials, and more specifically to a cold-galvanized anti-corrosion coating and its preparation method. Background Technology

[0002] With the continuous optimization of metal smelting technology, steel has become one of the most important materials. However, with its widespread use in various environments, various problems have emerged, among which corrosion is particularly prominent.

[0003] Zinc exhibits extremely strong corrosion resistance in the atmosphere, far exceeding that of steel. Furthermore, zinc has a lower electrode potential than iron, thus acting as a sacrificial anode to protect the cathode. Plating zinc on the surface of steel plates effectively prevents the steel from contacting the air, providing crucial isolation and protection.

[0004] Cold galvanizing coatings consist of three parts: zinc powder with a purity higher than 99.9%, special organic resin, and additives. To date, cold galvanizing coatings have experienced rapid development in China, and are widely used in rust prevention of steel structures and in the maintenance of galvanized components. Cold galvanizing offers excellent rust prevention, convenient construction, and good environmental performance, making it a prominent player in the field of steel corrosion-resistant coatings.

[0005] Patent CN116535924A discloses a composite cold-galvanizing coating and its preparation method. The raw materials include water-based acrylic resin, modified zinc powder, crosslinking agent, thickener, and deionized water. The modified zinc powder undergoes polypyrrole coating, double bond modification, and acrylate polymerization treatment. The crosslinking agent contains siloxane and Schiff base structures. This coating enhances the dispersion stability and conductivity of zinc powder, improves coating density, adhesion, and corrosion resistance, and offers excellent protective performance while being environmentally friendly. However, the long-term compatibility between the modified zinc powder, crosslinking agent, and thickener components in this patent is difficult to guarantee, and component separation problems such as zinc powder sedimentation easily occur during long-term storage.

[0006] Therefore, the preparation of a cold galvanizing coating with good long-term storage stability, simple preparation method and low cost has broad application prospects. Summary of the Invention

[0007] This invention aims to provide a cold-galvanized anti-corrosion coating and its preparation method. The coating has good long-term storage stability and improves the salt spray resistance and hydrophobicity of the coating. It is suitable for rust prevention of steel building materials and maintenance of galvanized components.

[0008] A cold-galvanized anti-corrosion coating comprises the following components in parts by weight: 10-15 parts of silicone-modified acrylic emulsion, 0.5-0.8 parts of polymeric wetting and dispersing agent, 80-90 parts of modified zinc powder, 0.4-0.6 parts of thickener, 0.6-0.9 parts of hydrophilic fumed silica, and 5-8 parts of deionized water.

[0009] The thickener is either a polyurethane thickener or a polyacrylate thickener.

[0010] The method for preparing organosilicon-modified acrylate emulsion includes the following steps:

[0011] (1) Formation of pre-emulsion: Mix 60-80 parts by weight of deionized water and 2-4 parts by weight of composite emulsifier in a constant temperature magnetic stirrer and stir at 20-30℃ and 250-350rpm for 20-40min to dissolve the composite emulsifier and form an emulsion solution; add 90-110 parts by weight of mixed acrylate monomers to the emulsion solution and stir at 9000-11000rpm for 20-40min to form a pre-emulsion.

[0012] (2) Synthesis of seed emulsion: 1 / 4-1 / 3 of the pre-emulsion obtained in step (1) and 25-35 parts by weight of 0.2-0.4% NaHCO3 buffer solution are stirred and mixed at 150-250 rpm, and the temperature is slowly increased to 68-72℃ at a rate of 1-2℃ / min; 20-30 parts by weight of 0.3-0.5% ammonium persulfate aqueous solution are added, and after the blue phase appears, the temperature is kept warm for 10-20 min to form seed emulsion.

[0013] (3) The main reaction proceeds: The remaining pre-emulsion, 4-6 parts by weight of monovinyl-terminated polydimethylsiloxane and 20-30 parts by weight of 0.3-0.5% ammonium persulfate aqueous solution are added dropwise at a constant rate of 75-80℃, ensuring that the addition is completed within 2.5-3h. Continue to keep the reaction at the temperature for 20-40min, and discharge the material when the temperature drops to room temperature.

[0014] Preferably, the mixed acrylate monomers in step (1) consist of 70-75% butyl methacrylate, 15-20% methyl methacrylate, 5-7% methacrylic acid and 3-5% acrylic acid.

[0015] Preferably, the composite emulsifier in step (1) is a composite of anionic emulsifier and nonionic emulsifier in a mass ratio of 1:2.

[0016] Furthermore, the anionic emulsifier is one of sodium dodecyl sulfate, sodium dodecyl sulfonate, or sodium dodecylbenzene sulfonate.

[0017] Furthermore, the nonionic emulsifier is one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, or isomeric alcohol polyoxyethylene ether.

[0018] Preferably, the viscosity of the monovinyl-terminated polydimethylsiloxane in step (3) is between 40 and 80 cSt. This viscosity range can enhance the winding ability of zinc powder particles while ensuring the flexibility of the chain segments, and the steric hindrance effect is more significant.

[0019] The preparation of modified zinc powder includes the following steps: dispersing 30-40 parts by weight of zinc powder in 90-110 parts by weight of ethanol to obtain a zinc powder mixture; weighing 6-8% of silane coupling agent KH570 according to the weight of zinc powder, mixing it according to the mass ratio of silane coupling agent:deionized water:ethanol of 1:(7-9):(9-11), adjusting the pH to 4.5-5.5 and ultrasonically dispersing for 30-40 min to obtain a silane coupling agent hydrolysate; stirring the zinc powder mixture and the silane coupling agent hydrolysate at 60-80℃ and 300-600rpm for 2-3 h; filtering the modified zinc powder, washing it three times with anhydrous ethanol to remove residual silane coupling agent, and drying it in an oven at 100-120℃.

[0020] Preferably, the zinc powder is spherical or flake zinc powder with a mesh size of 800-1000.

[0021] This invention also provides a method for preparing a cold-galvanized anti-corrosion coating. The method involves first dispersing hydrophilic fumed silica, a wetting and dispersing agent, and deionized water at 3000-5000 rpm for 10-15 min according to a specified ratio. Then, an organosilicon-modified acrylate emulsion is added and stirred at 500-1000 rpm for 30-40 min. Modified zinc powder is then added, and stirring continues at 1000-1500 rpm for 30-40 min. Finally, a thickener is added, and the mixture is stirred at 500-1000 rpm for 10-20 min until the viscosity is uniform, thus obtaining the cold-galvanized coating.

[0022] Cold galvanizing systems contain a large amount of zinc powder. Since zinc powder has a density of approximately 7.14 g / cm³, it is prone to sedimentation and agglomeration. The essence of zinc powder sedimentation is that high-density particles in the system are subject to gravity. Due to a lack of sufficient repulsive force between particles or insufficient system viscosity, agglomeration and aggregation accelerate sedimentation, leading to insufficient long-term storage stability of the product. If zinc powder sedimentation occurs during storage, it will cause differences in zinc powder content between the upper and lower layers of the coating, resulting in uneven zinc content in the coating after application, directly affecting the anti-corrosion performance and ultimately impacting the product's performance. Therefore, the stable dispersion capability of the cold galvanizing system is crucial.

[0023] This invention connects long-chain polydimethylsiloxane to acrylate segments, which then wraps around the surface of zinc powder particles in a "flexible long-chain" form. This significantly increases the distance between zinc powder particles, greatly weakens the van der Waals forces between particles, and reduces the surface energy of the zinc powder particles, decreasing the tendency for spontaneous aggregation and allowing the zinc powder to remain well dispersed or only form a weak flocculation state. The addition of hydrophilic fumed silica in this invention relies primarily on the hydroxyl groups present on the surface of its nanoparticles to spontaneously form a three-dimensional network structure through hydrogen bonding, providing a more stable physical support network for high-density zinc powder particles. Therefore, the long-chain polydimethylsiloxane solves the problem of "inter-particle attraction," and the hydrophilic fumed silica solves the problem of "overall system support," enabling long-term storage. This invention adds 4-6 parts by weight of monovinyl-terminated polydimethylsiloxane to 90-110 parts by weight of acrylate monomer. The purpose is to increase the distance between zinc powder particles without isolating the conductive pathways between zinc powder particles due to excessive polydimethylsiloxane.

[0024] Because zinc powder is a reactive metal, it easily reacts with trace amounts of moisture and acidic substances in the coating system during storage to form loose zinc oxide or zinc hydroxide, thereby compromising dispersion stability and anti-settling effect. Therefore, this invention uses a silane coupling agent to modify the surface of the zinc powder, forming a chemically bonded organosilane layer that isolates the zinc powder from water and acids in the system, inhibits chemical corrosion, and prolongs the storage stability of the zinc powder.

[0025] This invention employs a polymeric wetting and dispersing agent, which provides steric hindrance, stabilizes zinc powder, and prevents sedimentation, allowing the zinc powder to be more uniformly "embedded" into the silica network. Simultaneously, the polymeric wetting and dispersing agent enhances the compatibility between polydimethylsiloxane and hydrophilic fumed silica, reducing system separation caused by insufficient compatibility, thereby improving the long-term storage stability of the coating.

[0026] Therefore, compared with the prior art, the present invention has the following advantages: (1) By adding polydimethylsiloxane long-chain modified waterborne acrylic emulsion, combined with polymeric wetting and dispersing agent and hydrophilic fumed silica antisettling agent, the role of each component is fully utilized. Through the synergistic effect of "multiple spatial steric hindrance + three-dimensional network structure", the antisettling effect is significantly improved. Moreover, it forms complementary advantages in terms of workability and storage stability. The overall performance is far superior to a single antisettling mechanism.

[0027] (2) The hydrophobic polydimethylsiloxane long chain can reduce the penetration of water molecules into the coating. Therefore, when the modified acrylic emulsion is used as a film-forming agent, it can significantly improve the salt spray resistance of the cold galvanized coating. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely for the purpose of helping to understand the technical content and effects of this invention and should not be considered as limitations on this invention.

[0029] In the embodiments and comparative examples of this invention, the hydrophilic fumed silica was selected from Zhongbei Fine Chemicals' A200, and the hydrophobic fumed silica was selected from Zhongbei Fine Chemicals' ZB-8150; the thickener was selected from Mair Chemicals' HY-305; the wetting and dispersing agent was selected from BYK Chemicals' DISPERBYK-2055; the acrylate was purchased from Jinan Century Tongda Chemical Co., Ltd.; the silane coupling agent and monovinyl-terminated polydimethylsiloxane (cSt 50) and divinyl-terminated polydimethylsiloxane (cSt 50) were purchased from Shandong Dongyue Organosilicon Co., Ltd. The remaining raw materials and additives were all common commercially available products.

[0030] Manufacturing Example 1:

[0031] An organosilicon-modified acrylate emulsion is prepared by the following steps:

[0032] (1) Formation of pre-emulsion: 70 parts by mass of deionized water and 3 parts by mass of composite emulsifier (sodium dodecyl sulfate and alkylphenol polyoxyethylene ether OP-10 in a mass ratio of 1:2) were mixed and placed in a constant temperature magnetic stirrer and stirred at 25°C and 300 rpm for 30 min to dissolve the composite emulsifier and form an emulsifier solution; 100 parts by mass of mixed acrylate monomers (specifically 75% butyl methacrylate, 15% methyl methacrylate, 7% methacrylic acid and 3% acrylic acid) were added to the emulsifier solution and stirred at 10000 rpm for 30 min to form a pre-emulsion.

[0033] (2) Synthesis of seed emulsion: 1 / 3 part of the pre-emulsion obtained in step (1) and 30 parts by mass of 0.3% NaHCO3 buffer solution were stirred and mixed at 200 rpm, and the temperature was slowly increased to 70℃ at a rate of 1℃ / min; 25 parts by mass of 0.4% ammonium persulfate aqueous solution were added, and after the blue phase appeared, the temperature was kept for 15 min to form seed emulsion.

[0034] (3) The main reaction proceeds: The remaining pre-emulsion, 5 parts by mass of monovinyl-terminated polydimethylsiloxane (cSt is 50) and 25 parts by mass of 0.4% ammonium persulfate aqueous solution are added dropwise at a constant rate at 80°C and the addition is completed within 3 hours. The reaction is continued at the temperature for 30 minutes and the material is discharged when the temperature drops to room temperature.

[0035] Manufacturing Example 2:

[0036] A silicone-modified acrylate emulsion is prepared in a manner that is essentially the same as that in manufacturing example 1, except that in step (3), 5 parts by mass of divinyl-terminated polydimethylsiloxane (cSt = 50) is added to replace monovinyl-terminated polydimethylsiloxane.

[0037] Manufacturing Example A:

[0038] A modified zinc powder is prepared by the following steps: 30 parts by weight of 1000-mesh flake zinc powder are dispersed in 100 parts by weight of ethanol to obtain a zinc powder mixture; 6% of silane coupling agent KH570 is weighed according to the zinc powder mass, and mixed according to the mass ratio of silane coupling agent:deionized water:ethanol of 1:8:10, and the pH is adjusted to 5 and ultrasonically dispersed for 40 min to obtain a silane coupling agent hydrolysate; the zinc powder mixture and the silane coupling agent hydrolysate are stirred and reacted at 70℃ and 400 rpm for 2 h; the modified zinc powder is filtered, washed three times with anhydrous ethanol to remove residual silane coupling agent, and dried in an oven at 110℃ to obtain modified zinc powder.

[0039] Example 1

[0040] A cold galvanizing coating comprises the following components in parts by weight: 10 parts of silicone-modified acrylate emulsion (Example 1), 0.5 parts of polymeric wetting and dispersing agent, 80 parts of modified zinc powder (Example A), 0.5 parts of thickener, 0.7 parts of hydrophilic fumed silica, and 6 parts of deionized water. According to the formulation, the hydrophilic fumed silica, polymeric wetting and dispersing agent, and deionized water are first dispersed at 3500 rpm for 15 min. Then, the silicone-modified acrylate emulsion is added and stirred at 800 rpm for 30 min. Next, the modified zinc powder is added and stirred at 1200 rpm for another 30 min. Finally, the thickener is added and stirred at 500 rpm for 20 min until the viscosity is uniform, thus obtaining the cold galvanizing coating.

[0041] Example 2

[0042] A cold galvanizing coating comprises the following components in parts by weight: 15 parts of silicone-modified acrylate emulsion (Example 1), 0.8 parts of polymeric wetting and dispersing agent, 90 parts of modified zinc powder (Example A), 0.6 parts of thickener, 0.9 parts of hydrophilic fumed silica, and 8 parts of deionized water. According to the formulation, the hydrophilic fumed silica, polymeric wetting and dispersing agent, and deionized water are first dispersed at 3500 rpm for 15 min. Then, the silicone-modified acrylate emulsion is added and stirred at 800 rpm for 30 min. Next, the modified zinc powder is added and stirred at 1200 rpm for another 30 min. Finally, the thickener is added and stirred at 700 rpm for 15 min until the viscosity is uniform, thus obtaining the cold galvanizing coating.

[0043] Comparative Example 1:

[0044] A cold galvanizing coating comprises the following components in parts by weight: 10 parts of silicone-modified acrylate emulsion (Example 2), 0.5 parts of polymeric wetting and dispersing agent, 80 parts of modified zinc powder (Example A), 0.5 parts of thickener, 0.7 parts of hydrophilic fumed silica, and 6 parts of deionized water. According to the formula, the hydrophilic fumed silica, polymeric wetting and dispersing agent, and deionized water are first dispersed at 3500 rpm for 15 min. Then, the silicone-modified acrylate emulsion is added and stirred at 800 rpm for 30 min. Next, the modified zinc powder is added and stirred at 1200 rpm for another 30 min. Finally, the thickener is added and stirred at 500 rpm for 20 min until the viscosity is uniform, thus obtaining the cold galvanizing coating.

[0045] Comparative Example 2:

[0046] A cold galvanizing coating comprises the following components in parts by weight: 15 parts of silicone-modified acrylate emulsion (Example 1), 0.8 parts of polymeric wetting and dispersing agent, 90 parts of modified zinc powder (Example A), 0.6 parts of thickener, 0.9 parts of hydrophobic fumed silica, and 8 parts of deionized water. According to the formula, the hydrophobic fumed silica, polymeric wetting and dispersing agent, and deionized water are first dispersed at 3500 rpm for 15 min. Then, the silicone-modified acrylate emulsion is added and stirred at 800 rpm for 30 min. Next, the modified zinc powder is added and stirred at 1200 rpm for another 30 min. Finally, the thickener is added and stirred at 700 rpm for 15 min until the viscosity is uniform, thus obtaining the cold galvanizing coating.

[0047] Comparative Example 3

[0048] The only difference from Example 1 is that no polymeric wetting and dispersing agent is added.

[0049] The storage stability and salt spray resistance of the cold galvanizing coatings in Examples 1-2 and Comparative Examples 1-3 were tested.

[0050] The storage stability test method is as follows: The test is conducted according to GB / T 6753-1986 "Test Method for Storage Stability of Coatings". The freshly prepared cold-galvanized sample is placed in a glass jar. After standing for one day, it is placed in a constant temperature chamber at 50±2℃. The test lasts for one month, and the storage stability of the cold-galvanized sample is evaluated according to the standard.

[0051] The salt spray resistance test method is as follows: The test is conducted according to GB / T 1771-2007 "Determination of the resistance to neutral salt spray of paints and varnishes". A scratch parallel to the long side is made on the test plate. The prepared coating is then evenly applied to the steel plate, and after drying, a second coat is applied. The coating thickness reaches 60-100 μm. Finally, the temperature of the salt spray test chamber is adjusted to (35±2)℃, the pH value to 6.5, and the salt water concentration to (50±10) g / L. The added sodium chloride should be white, and its mass fraction should be greater than 99.5%. A 2000-hour salt spray test is then conducted. The coating surface is observed for defects such as blistering, rusting, cracking, and peeling. The degree of damage is rated according to GB / T 1766-2008.

[0052] The test results of Examples 1-2 and Comparative Examples 1-3 are shown in Table 1 below.

[0053]

[0054] Comparing the examples and Comparative Example 1, the divinyl-terminated polydimethylsiloxane of Comparative Example 1 reacts with two different acrylate segments, resulting in the acrylate segments being bridged by the polydimethylsiloxane to form a cross-linked network structure. The steric hindrance of the segments is weakened, and the restricted movement of molecular chains leads to an increase in system viscosity, causing zinc powder to settle. At the same time, the coating becomes more brittle and prone to corrosion, resulting in Comparative Example 1 having lower storage stability and salt spray resistance than the examples.

[0055] Comparing the examples and Comparative Example 2, in Comparative Example 2, the addition of hydrophobic fumed silica to replace hydrophilic fumed silica resulted in insufficient hydroxyl groups on the surface of the hydrophobic fumed silica, poor compatibility with the aqueous system, and inability to uniformly disperse and form an effective three-dimensional network structure. This led to zinc powder sedimentation, uneven zinc powder content in the coating after construction, and easy corrosion, resulting in poor storage stability and salt spray resistance.

[0056] Comparing the examples and Comparative Example 3, when no polymeric wetting and dispersing agent is added, the compatibility between polydimethylsiloxane and hydrophilic fumed silica decreases, the stability of the three-dimensional network structure is insufficient, resulting in defects such as pores in the coating, which leads to poor storage stability and salt spray resistance.

[0057] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A cold-galvanizing anti-corrosion coating, characterized in that, It contains the following components by weight: 10-15 parts of silicone-modified acrylate emulsion, 0.5-0.8 parts of polymeric wetting and dispersing agent, 80-90 parts of modified zinc powder, 0.4-0.6 parts of thickener, 0.6-0.9 parts of hydrophilic fumed silica, and 5-8 parts of deionized water; The preparation of modified zinc powder includes the following steps: dispersing 30-40 parts by weight of zinc powder in 90-110 parts by weight of ethanol to obtain a zinc powder mixture; weighing 6-8% of silane coupling agent KH570 according to the weight of zinc powder, mixing it according to the mass ratio of silane coupling agent:deionized water:ethanol of 1:(7-9):(9-11), adjusting the pH to 4.5-5.5 and ultrasonically dispersing for 30-40 min to obtain a silane coupling agent hydrolysate; stirring the zinc powder mixture and the silane coupling agent hydrolysate at 60-80℃ and 300-600rpm for 2-3 h; filtering the modified zinc powder, washing it three times with anhydrous ethanol to remove residual silane coupling agent, and drying it in an oven at 100-120℃; Organosilicon-modified acrylate emulsions were prepared using the following method: (1) Formation of pre-emulsion: Mix 60-80 parts by weight of deionized water and 2-4 parts by weight of composite emulsifier in a constant temperature magnetic stirrer, and stir for 20-40 minutes at 20-30℃ and 250-350 rpm to dissolve the composite emulsifier and form an emulsifier solution; add 90-110 parts by weight of mixed acrylate monomers to the emulsifier solution, and stir for 20-40 minutes at 9000-11000 rpm to form a pre-emulsion; wherein the mixed acrylate monomers are composed of... It consists of 70-75% butyl methacrylate, 15-20% methyl methacrylate, 5-7% methacrylic acid, and 3-5% acrylic acid; the composite emulsifier is a mixture of anionic and nonionic emulsifiers in a 1:2 mass ratio. The anionic emulsifier is one of sodium dodecyl sulfate, sodium dodecyl sulfonate, or sodium dodecylbenzene sulfonate, and the nonionic emulsifier is one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, or isomeric alcohol polyoxyethylene ether. (2) Synthesis of seed emulsion: 1 / 4-1 / 3 part of the pre-emulsion obtained in step (1) and 25-35 parts by weight of 0.2-0.4% NaHCO3 buffer solution are stirred and mixed at 150-250 rpm, and the temperature is slowly increased to 68-72℃ at a rate of 1-2℃ / min; 20-30 parts by weight of 0.3-0.5% ammonium persulfate aqueous solution are added, and after the blue phase appears, the temperature is kept warm for 10-20 min to form seed emulsion; (3) The main reaction proceeds: The remaining pre-emulsion, 4-6 parts by weight of monovinyl-terminated polydimethylsiloxane and 20-30 parts by weight of 0.3-0.5% ammonium persulfate aqueous solution are added dropwise at a constant rate of 75-80℃, ensuring that the addition is completed within 2.5-3h. Continue to keep the reaction at the temperature for 20-40min, and discharge the material when the temperature drops to room temperature.

2. The cold-dip galvanizing anti-corrosion coating according to claim 1, characterized in that, The thickener is a type of polyurethane thickener or polyacrylate thickener.

3. The cold-dip galvanizing anti-corrosion coating according to claim 1, characterized in that, The viscosity of the monovinyl-terminated polydimethylsiloxane in step (3) is between 40 and 80 cSt.

4. The cold-dip galvanizing anti-corrosion coating according to claim 1, characterized in that, The zinc powder used is spherical or flake zinc powder with a mesh size of 800-1000.

5. The method for preparing the cold galvanizing anti-corrosion coating according to any one of claims 1-4, wherein hydrophilic fumed silica, polymeric wetting and dispersing agent and deionized water are first dispersed at 3000-5000 rpm for 10-15 min according to the formula, then an organosilicon-modified acrylate emulsion is added and stirred and mixed at 500-1000 rpm for 30-40 min, then modified zinc powder is added and stirred at 1000-1500 rpm for 30-40 min, and finally a thickener is added and stirred at 500-1000 rpm for 10-20 min until the viscosity is uniform, thereby obtaining the cold galvanizing coating.

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