Organic-inorganic hybrid acrylic anticorrosive paint and preparation method thereof

Abstract

The invention discloses an organic-inorganic hybrid anticorrosive paint with ultrahigh hardness and high adhesive force and a preparation method of the organic-inorganic hybrid anticorrosive paint with ultrahigh hardness and high adhesive force. The paint takes hydroxyl acrylic emulsion as a base material, and difunctional monomers of glycidyl methacrylate (GMA) and hydroxyethyl acrylate (HEMA) are synergistically cross-linked; simple in-situ hybridization of micron-sized flaky talcum powder and organic resin is realized by virtue of a silane coupling agent KH550, zinc phosphate and mica iron oxide composite anti-rust pigment and a domestic hydrophilic modified HDI tripolymer curing agent are compounded, and three steps of premixing, dispersing and grinding and mixing are performed to prepare the anti-rust paint. The pencil hardness of the finished coating is larger than or equal to 8H, the adhesive force is larger than or equal to 18MPa, the neutral salt mist resistance is larger than or equal to 1200h, the VOC content is smaller than or equal to 70g / L, the total cost per ton is smaller than or equal to 20000 yuan, complex production equipment and processes are not needed, room-temperature curing and batch production can be achieved, the stability is high, the coating is suitable for moderate and severe corrosion scenes such as ocean engineering auxiliary structures and port machinery bases, and the coating has the advantages of high performance, low cost, mass production feasibility and wide application prospects.

Description

Technical Field

[0001] This invention belongs to the field of metal anti-corrosion coating technology, specifically relating to an ultra-high hardness, high adhesion organic-inorganic hybrid acrylic anti-corrosion coating and its preparation method, which is particularly suitable for the protection of metal substrates in medium to heavy corrosion environments and can be mass-produced industrially. Background Technology

[0002] With industrial development, the requirements for corrosion protection of metal substrates in fields such as marine engineering, port machinery, and bridge steel structures are increasing. Coatings need to have ultra-high hardness to resist physical wear, high adhesion to prevent film peeling, and long-term corrosion resistance to extend the service life of the substrate.

[0003] Chinese patent CN201310233259.6 / 103275522B discloses a coating that uses a silane coupling agent to coat and modify talc powder and combines it with hydroxyl acrylic resin. Although this patent improves the hardness and corrosion resistance of the coating, it still has the following important defects: 1. It only modifies the surface of talc powder by coating with a silane coupling agent, without forming an organic-inorganic interpenetrating network, resulting in insufficient film density, leading to a hardness ≤6H, adhesion ≤12MPa, and salt spray resistance ≤800h; 2. It lacks dedicated functional monomers for synergistic crosslinking, relying on a single resin to form the film, resulting in limited adhesion between the film and the substrate and limited anti-aging properties; 3. It relies on imported raw materials, has a complex production process, and costs ≥30,000 yuan / ton. Moreover, production requires nitrogen protection, step-by-step dripping, and other operations, with a single batch cycle ≥3h and poor mass production stability (scrapping rate ≥5%); 4. The formula contains organic solvents, resulting in high VOC content and significant environmental pressure.

[0004] Furthermore, other existing technologies suffer from high raw material costs, complex processes, and limited performance. Therefore, developing an anti-corrosion coating that combines "ultra-high performance, low cost, short-cycle mass production, and environmental compliance" has become a pressing technical challenge for the industry.

[0005] Therefore, developing an ultra-high hardness, high adhesion organic-inorganic hybrid acrylic anti-corrosion coating with simple preparation process, low raw material cost, qualified performance, and mass production capability has become an urgent technical problem to be solved in the industry. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ultra-high hardness, high adhesion organic-inorganic hybrid acrylic anti-corrosion coating and its preparation method. Through formula innovation and process simplification, the high performance of the coating is guaranteed while achieving low-cost mass production, filling a technological gap in the industry. (a) Coating components

[0007] A high-hardness, high-adhesion organic-inorganic hybrid acrylic anti-corrosion coating, comprising the following components by weight: Hydroxyacrylic emulsion 450-500 parts Glycidyl methacrylate (GMA) 25-35 parts 15-25 parts of hydroxyethyl acrylate (HEMA) Silane coupling agent KH550 12-18 parts 90-110 parts of micron-sized flake talc powder 70-90 parts of zinc phosphate 80-100 parts of mica iron oxide 5-7 parts of wetting and dispersing agent 2-4 parts of silicone defoamer 3-5 parts of polyvinyl alcohol leveling agent 50-70 parts of hydrophilic modified HDI trimer 30-45 parts water; The hydroxyl acrylic emulsion has a solid content of 45%, the micron-sized flake talc powder has a particle size of 325 mesh, and the hydrophilic modified HDI trimer has a solid content of 75%. The coating is constructed by in-situ hybridization to form an organic-inorganic interpenetrating network. The finished coating has a pencil hardness ≥8H, cross-cut adhesion grade 0, pull-off adhesion ≥18MPa, neutral salt spray resistance ≥1200h, and VOC content ≤70g / L. (II) Core Roles of Each Component

[0008] 1. Hydroxy acrylic emulsion: As the main film-forming base material, it has a solid content of 45%, good room temperature curing ability and film density, which is superior to similar resins in existing technologies. It is also a conventional low-cost raw material in industry with a wide range of procurement channels, reducing basic costs. 2. Glycidyl methacrylate (GMA) + hydroxyethyl acrylate (HEMA): A synergistic innovation of bifunctional monomers, which is different from the existing single resin film formation technology. GMA forms covalent bonds with the hydroxyl groups of the metal substrate to improve adhesion, while HEMA crosslinks with the curing agent to enhance the film density. The two work together to achieve the triple effect of "high adhesion + high hardness + long-term corrosion resistance".

[0009] 3. Silane coupling agent KH550: Breaking through the limitations of existing "surface coating" technology, it acts as an organic-inorganic interpenetrating network bridge to achieve in-situ covalent bond connection between organic resin and talc powder, constructing a dense hybrid structure without the need for complex hybrid equipment.

[0010] 4. Micron-sized flake talc (325 mesh): It replaces expensive nanomaterials and existing ordinary talc powder. The flake structure fills the gaps in the film layer. The cost is only 1 / 10 of that of nano SiO2. Moreover, the dispersion is better after pre-wetting treatment, making it suitable for mass production.

[0011] 5. Zinc phosphate + mica iron oxide: a composite rust-preventive system. Compared with existing single rust-preventive pigments and fillers, it synergistically inhibits metal corrosion and delays media penetration, increasing the rust prevention period by 50%.

[0012] 6. Wetting and dispersing agent: A domestically produced compound product that replaces imported additives, reducing additive costs by more than 50%, and has a better dispersion effect than similar products with existing technology, avoiding pigment and filler agglomeration.

[0013] 7. Hydrophilic modified HDI trimer: A domestically produced, affordable curing agent with a solid content of 75%. It synergistically crosslinks with HEMA hydroxyl groups and acrylic emulsion hydroxyl groups, reducing costs by 40% compared to imported curing agents and achieving higher crosslinking efficiency, thus enhancing film hardness and corrosion resistance.

[0014] 8. Water: As the sole solvent, no organic solvents are required, VOC content is ≤70g / L, environmentally compliant, and there are no additional procurement costs.

[0015] Furthermore, the anti-corrosion coating of the present invention comprises, by weight, the following components: 480 parts of hydroxyacrylic acid emulsion 30 parts of glycidyl methacrylate 20 parts of hydroxyethyl acrylate 15 parts of silane coupling agent KH550 100 parts of micron-sized flake talc powder 80 parts of zinc phosphate 90 parts of mica iron oxide 6 parts wetting and dispersing agent 3 parts of silicone defoamer 4 parts of polyvinyl alcohol leveling agent 60 parts of hydrophilic modified HDI trimer 38 portions of water.

[0016] Furthermore, the wetting and dispersing agent is a domestically produced compound dispersant, and the hydrophilic modified HDI trimer is a domestically produced, affordable product, reducing costs by more than 40% compared to imported similar products.

[0017] Furthermore, the present invention also discloses a method for preparing the above-mentioned anti-corrosion coating, which includes the following steps: Step 1: Premixing to construct an in-situ interpenetrating network hybrid system. Unlike the existing technology of "surface coating modification", organic-inorganic covalent bond connection is achieved through KH550 bridging to construct an interpenetrating network without the need for additional hybridization equipment; Add the prescribed amount of tap water (which has been settling for 12 hours to remove impurities and chlorine) to a standard industrial paint mixing tank. Turn on the stirrer and control the speed at 600 rpm. Add hydroxyl acrylic emulsion, glycidyl methacrylate, and hydroxyethyl acrylate in sequence, and stir for 10 minutes until the system is uniformly milky white, ensuring that the base material and modified monomer are fully integrated. Then, slowly add silane coupling agent KH550 and pre-wetted micron-sized flake talc powder (wet the talc powder with a small amount of water from the formula to avoid dust generation during dispersion and improve dispersion efficiency). Increase the stirring speed to 800 rpm and continue stirring for 10 minutes. Through the bridging effect of silane coupling agent KH550 (one end reacts with the carboxyl group of the organic resin, and the other end forms a covalent bond with the hydroxyl group on the surface of the talc powder), the covalent bond connection between the organic resin and inorganic talc powder is achieved in situ, completing a simple in-situ hybridization and obtaining a premixed solution. This step does not require additional hybridization reaction equipment and conditions.

[0018] Step 2: Dispersion of pigments, fillers and additives. No need for step-by-step addition. High-speed dispersion for 30 minutes can achieve uniform dispersion, simplifying the operation process and differentiating it from the complicated feeding sequence of existing technologies. Keep the stirring speed at 800 rpm, and add zinc phosphate, mica iron oxide, wetting and dispersing agent, organosilicon defoamer, and polyvinyl alcohol leveling agent to the premixed liquid obtained in step one in sequence. After the addition is completed, increase the stirring speed to 1100 rpm and disperse at high speed for 30 minutes until there is no obvious agglomeration of pigments and fillers in the system, and obtain a dispersion. Take samples every 10 minutes to observe until there is no obvious agglomeration of pigments and fillers in the system, and obtain a uniformly dispersed dispersion. This step does not require the addition of pigments and fillers in steps, which simplifies the operation process.

[0019] Step 3: Grinding and mixing with curing agent to form the product. One grinding is sufficient to meet the standard, unlike existing technologies that require multiple grindings. The curing agent is mixed at a low speed to avoid uneven local cross-linking. The entire process does not require nitrogen protection, high-temperature reaction, or step-by-step addition. The cycle time for a single batch is ≤1.5 hours, and workers can start working after 30 minutes of training.

[0020] The dispersion obtained in step two is fed into a simple sand mill (a colloid mill can be used instead) and ground once until the coating fineness is ≤35μm (tested with a scraper fineness gauge) to ensure that the pigments and fillers are completely integrated with the hybrid system and improve the uniformity of the film layer. After grinding, the material is returned to the paint mixing tank, the stirring speed is reduced to 500rpm, and the hydrophilic modified HDI trimer is slowly added. The mixture is stirred for 20min until the system is completely homogeneous to avoid uneven local crosslinking. Finally, the viscosity of the system is finely adjusted to 28-32s (25℃, Ford cup 4 test) with a small amount of water. After filtration through a 120-mesh filter, the finished coating is obtained.

[0021] Furthermore, the pre-wetting treatment of the micron-sized flake talc powder in step one is as follows: the talc powder is moistened with a small amount of water as specified in the formula to avoid dust generation during the dispersion process, while improving the hybridization efficiency with the organic phase.

[0022] Furthermore, the water mentioned in step one is tap water that has been left to stand for 12 hours to remove impurities and chlorine, and no additional purification is required.

[0023] Furthermore, the entire preparation process does not require nitrogen protection, high-temperature reaction, or stepwise dropwise addition, and the preparation cycle is ≤1.5h, which is more than 50% more efficient than existing technologies (single batch ≥3h).

[0024] Furthermore, the equipment used consists of ordinary industrial paint mixing kettles, simple sand mills, scraper fineness gauges, and Coating-4 cups, all of which are conventional production equipment in the coatings industry, requiring no additional high-end equipment.

[0025] The beneficial effects of the present invention are mainly reflected in the following: the preparation process of the anti-corrosion coating does not require nitrogen protection, high temperature reaction and step-by-step dripping operation, the production time of a single batch is ≤1.5h, the equipment used is all conventional production equipment in the coating industry, there is no need to add high-end equipment or modify the production line, and workers can be trained to operate after 30 minutes.

[0026] The anti-corrosion coating has high stability and is suitable for medium to heavy corrosion scenarios such as marine engineering auxiliary structures and port machinery bases. It combines high performance, low cost and mass production feasibility, and has broad application prospects. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the anti-corrosion coating structure of the present invention. Figure 2 This is a flow chart of the preparation process of the anti-corrosion coating of the present invention.

[0028] Figure 3 The radar chart shows the core performance of the embodiments of the present invention and Comparative Example 5 (Prior Art).

[0029] in, Figure 1 The left figure is a schematic diagram of the organic-inorganic interpenetrating network structure of the anti-corrosion coating of the present invention; the right figure is a schematic diagram of the surface coating structure of the prior art anti-corrosion coating. Figure 2 The flowchart shown includes the three core processes of premixing, dispersing, and grinding / mixing, along with annotations of key parameters. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Example 1

[0031] An ultra-high hardness, high adhesion organic-inorganic hybrid acrylic anti-corrosion coating, by weight, comprises the following components: 480 parts hydroxyl acrylic emulsion, 30 parts glycidyl methacrylate, 20 parts hydroxyethyl acrylate, 15 parts silane coupling agent KH550, 100 parts micron-sized flake talc powder, 80 parts zinc phosphate, 90 parts mica iron oxide, 6 parts domestic compound wetting and dispersing agent, 3 parts organosilicon defoamer, 4 parts polyvinyl alcohol leveling agent, 60 parts domestic hydrophilic modified HDI trimer, and 38 parts tap water.

[0032] The preparation method of the ultra-high hardness, high adhesion organic-inorganic hybrid acrylic anti-corrosion coating: Step 1: Add 38 parts of tap water that has been standing for 12 hours to the paint mixing tank. While stirring at 600 rpm, add 480 parts of hydroxyl acrylic emulsion, 30 parts of GMA, and 20 parts of HEMA in sequence, and stir for 10 minutes until homogeneous. Then add 15 parts of KH550 and 100 parts of pre-wetted talc powder, and stir at 800 rpm for 10 minutes to obtain a premixed solution. Step 2: Add 80 parts zinc phosphate, 90 parts mica iron oxide, 6 parts wetting and dispersing agent, 3 parts defoamer, and 4 parts leveling agent while stirring at 800 rpm. Increase the speed to 1100 rpm and disperse at high speed for 30 minutes to obtain a dispersion. Step 3: The dispersion is ground once in a simple sand mill (grinding time 25 min, grinding media particle size 0.8-1.0 mm). The fineness is tested to be 30 μm. After returning to the paint mixing tank, 60 parts of hydrophilic modified HDI trimer are added under stirring at 500 rpm and stirred for 20 min. The viscosity is then slightly adjusted to 30 s (25℃, Ford cup 4) with tap water. After filtering with a 120 mesh filter, the product is packaged to obtain the finished product. Example 2

[0033] An ultra-high hardness, high adhesion organic-inorganic hybrid acrylic anti-corrosion coating, comprising the following components by weight: 450 parts hydroxyl acrylic emulsion, 25 parts glycidyl methacrylate, 15 parts hydroxyethyl acrylate, 12 parts silane coupling agent KH550, 90 parts micron-sized flake talc, 70 parts zinc phosphate, 80 parts mica iron oxide, 5 parts domestic compound wetting and dispersing agent, 2 parts organosilicon defoamer, 3 parts polyvinyl alcohol leveling agent, 50 parts domestic hydrophilic modified HDI trimer, and 30 parts tap water.

[0034] The preparation method of the ultra-high hardness and high adhesion organic-inorganic hybrid acrylic anti-corrosion coating is the same as in Example 1. After grinding, the fineness is 32μm, and the viscosity is finely adjusted to 28s (25℃, Forte 4 cup) to obtain the finished product. Example 3

[0035] A high-hardness, high-adhesion organic-inorganic hybrid acrylic anti-corrosion coating, comprising the following components by weight: 500 parts hydroxyl acrylic emulsion, 35 parts glycidyl methacrylate, 25 parts hydroxyethyl acrylate, 18 parts silane coupling agent KH550, 110 parts micron-sized flake talc, 90 parts zinc phosphate, 100 parts mica iron oxide, 7 parts domestic compound wetting and dispersing agent, 4 parts organosilicon defoamer, 5 parts polyvinyl alcohol leveling agent, 70 parts domestic hydrophilic modified HDI trimer, and 45 parts tap water.

[0036] The preparation method of the ultra-high hardness and high adhesion organic-inorganic hybrid acrylic anti-corrosion coating is the same as in Example 1. After grinding, the fineness is 33μm, and the viscosity is finely adjusted to 32s (25℃, Forte 4 cup) to obtain the finished product. Performance testing (a) Testing equipment and conditions

[0037] 1. Testing equipment: Pencil hardness tester (model QHQ-A), pull-off adhesion tester (model LJ-1000), salt spray test chamber (model YWX / Q-750), VOC content tester (model GC-9890A), Forecast cup viscometer (standard model), scraper fineness meter (0-100μm); 2. Test conditions: room temperature 25℃, relative humidity 50%, salt spray test concentration 5% NaCl solution, temperature 35℃, continuous spraying. (II) Detailed raw test data

[0038] The performance of the finished coatings obtained in Examples 1-3 and Example 5 was tested, and the results are shown in the table below:

[0039] Comparative verification To verify the effectiveness of the core technology of this invention, the following comparative examples are provided: Comparative Example 1 (System without in-situ hybridization): The silane coupling agent KH550 and micron-sized talc were removed, and the remaining components and dosages were the same as in Example 1, and the preparation method was the same. Performance results: pencil hardness 4H, pull-off adhesion 10MPa, salt spray resistance 650h, performance decreased significantly, proving that "KH550 + talc in-situ hybridization" is the core to improve hardness and corrosion resistance. Comparative Example 2 (without bifunctional monomer synergy): Replace 20 parts of HEMA with 30 parts of GMA (retain only GMA), and use the same components and amounts as in Example 1, and prepare the product using the same method. Performance results: pencil hardness 7H, pull-off adhesion 13MPa, salt spray resistance 880h. The adhesion and corrosion resistance are insufficient, which proves that "GMA+HEMA dual monomer synergy" can significantly improve crosslinking density and substrate bonding. Comparative Example 3 (Nanomaterials replacing talc): Ten parts of nano-SiO2 were used to replace 100 parts of micron-sized talc powder, and the remaining components and amounts were the same as in Example 1. The preparation method was the same. Performance results: pencil hardness 8H, pull-off adhesion 19MPa, salt spray resistance 1320h. The performance met the standards, but the cost of raw materials per ton increased to 32,000 yuan, which proves the low-cost innovative advantage of the present invention in replacing nanomaterials with talc powder. Comparative Example 4 (Traditional Physical Blending): The amount of KH550 was halved to 7.5 parts, and the talc powder was added directly without pre-wetting. The other components and amounts were the same as in Example 1, and the preparation method was the same. Performance results: pencil hardness 6H, pull-off adhesion 12MPa, salt spray resistance 750h, and low hybridization efficiency, proving that the "simple in-situ hybridization" process is more efficient than traditional physical blending.

[0040] Comparative Example 5 (simulating prior art CN201310233259.6): According to its disclosed formula, talc powder was coated on the surface of silane coupling agent, without GMA and HEMA bifunctional monomers, and imported additives and curing agents were used. It was prepared by nitrogen protection and step-by-step dripping process; the performance results are shown in the table above, proving that the present invention far surpasses the prior art in terms of performance, cost and mass production. in conclusion

[0041] The substantial differences between this invention and existing technologies (including CN201310233259.6) are as follows: 1. The bifunctional monomer (GMA+HEMA) synergistic crosslinking design breaks through the limitations of single resin film formation; 2. The silane coupling agent KH550 constructs an organic-inorganic interpenetrating network, which is different from traditional surface coating; 3. The entire system uses domestically produced low-cost raw materials to replace imported additives and expensive nanomaterials; 4. The mass production process is extremely simplified, requiring no nitrogen protection, high temperature, or step-by-step addition.

[0042] The unexpected effects achieved by this invention are: while increasing hardness by 33%, adhesion by 50%, and salt spray resistance by 50%, the cost is reduced by more than 33%, the mass production cycle is shortened by 50%, the VOC content is reduced by 30%, and the mass production scrap rate is reduced to below 1%. It solves the pain point of existing technologies that are difficult to balance performance, cost, mass production and environmental protection. It has both technological innovation and commercial promotion value and can be quickly transformed into industrial mass production products.

[0043] The above embodiments have provided a detailed description of the technical solution of the present invention. Obviously, the present invention is not limited to the described embodiments. Based on the embodiments of the present invention, those skilled in the art can make various modifications, but any modifications that are equivalent to or similar to the present invention fall within the scope of protection of the present invention.

Claims

1. A high-hardness, high-adhesion organic-inorganic hybrid anti-corrosion coating, characterized in that, By weight, it includes the following components: Hydroxyacrylic emulsion 450-500 parts 25-35 parts of glycidyl methacrylate 15-25 parts of hydroxyethyl acrylate Silane coupling agent KH550 12-18 parts 90-110 parts of micron-sized flake talc powder 70-90 parts of zinc phosphate 80-100 parts of mica iron oxide 5-7 parts of wetting and dispersing agent 2-4 parts of silicone defoamer 3-5 parts of polyvinyl alcohol leveling agent 50-70 parts of hydrophilic modified HDI trimer 30-45 parts water.

2. The anti-corrosion coating according to claim 1, characterized in that, The hydroxyl acrylic emulsion has a solid content of 45%, the micron-sized flake talc powder has a particle size of 325 mesh, and the hydrophilic modified HDI trimer has a solid content of 75%. The coating is constructed by in-situ hybridization to form an organic-inorganic interpenetrating network. The finished coating has a pencil hardness ≥8H, cross-cut adhesion grade 0, pull-off adhesion ≥18MPa, neutral salt spray resistance ≥1200h, and VOC content ≤70g / L.

3. The anti-corrosion coating according to claim 1, characterized in that, By weight, it includes the following components: 480 parts of hydroxyacrylic acid emulsion 30 parts of glycidyl methacrylate 20 parts of hydroxyethyl acrylate 15 parts of silane coupling agent KH550 100 parts of micron-sized flake talc powder 80 parts of zinc phosphate 90 parts of mica iron oxide 6 parts wetting and dispersing agent 3 parts of silicone defoamer 4 parts of polyvinyl alcohol leveling agent 60 parts of hydrophilic modified HDI trimer 38 portions of water.

4. The anti-corrosion coating according to claim 1, characterized in that, The wetting and dispersing agent is a domestically produced compound dispersant, and the hydrophilic modified HDI trimer is a domestically produced, affordable product.

5. A method for preparing an anti-corrosion coating as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Premixing to construct in-situ hybrid systems Add the prescribed amount of water to the paint mixing tank, turn on the stirring device, control the speed at 600 rpm, and add hydroxy acrylic emulsion, glycidyl methacrylate, and hydroxyethyl acrylate in sequence, stirring for 10 minutes until the system is uniformly milky white; then slowly add silane coupling agent KH550 and pre-wetting micron-sized flake talc powder, increase the stirring speed to 800 rpm, and continue stirring for 10 minutes. The silane coupling agent KH550 achieves covalent bonds between organic resin and inorganic talc powder, constructing an organic-inorganic interpenetrating network in situ to obtain a premixed solution; Step 2: Dispersion of pigments, fillers, and additives Keep the stirring speed at 800 rpm, and add zinc phosphate, mica iron oxide, wetting and dispersing agent, organosilicon defoamer and polyvinyl alcohol leveling agent to the premixed liquid obtained in step one in sequence. After the addition is completed, increase the stirring speed to 1100 rpm and disperse at high speed for 30 minutes until there is no obvious pigment and filler agglomeration in the system to obtain the dispersion. Step 3: Grinding and mixing with curing agent to form the final product. The dispersion obtained in step two is fed into a sand mill and ground until the coating fineness is ≤35μm. After grinding, the material is returned to the paint mixing tank, the stirring speed is reduced to 500rpm, the hydrophilic modified HDI trimer is slowly added, and the mixture is stirred for 20min until the system is completely homogeneous. The viscosity of the system is adjusted to 28-32s with a small amount of water, filtered, and packaged to obtain the finished coating.

6. The preparation method according to claim 5, characterized in that, The pre-wetting treatment of micron-sized flake talc powder in step one is as follows: wet the talc powder with a small amount of water as specified in the formula to avoid dust generation during dispersion and to improve the hybridization efficiency with the organic phase.

7. The preparation method according to claim 5, characterized in that, The water mentioned in step one is tap water that has been left to stand for 12 hours to remove impurities and chlorine, and no additional purification is required.

8. The preparation method according to claim 5, characterized in that, The entire preparation process is free of It requires nitrogen protection, high temperature reaction and stepwise dropwise addition, and the preparation cycle is ≤1.5h.

9. The preparation method according to claim 5, characterized in that, The equipment used includes a standard industrial paint mixing kettle, a sand mill, a scraper fineness meter, and a Coating-4 cup, all of which are conventional production equipment in the paint industry.

10. The preparation method according to claim 5, characterized in that, The filtration described in step three uses a 120-mesh filter.

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