Anti-rust coating for steel structure and pipeline maintenance of thermal power plant and preparation method thereof

Abstract

The invention discloses an anti-rust coating for maintaining steel structures and pipelines in thermal power plants and a preparation method thereof, which comprises 12 parts to 18 parts of modified epoxy ester resin, 2 parts to 6 parts of modified acrylic resin, 60 parts to 80 parts of filler, 1 part to 2 parts of modified bentonite, 1 part to 2 parts of anti-settling agent, 0.2 parts to 0.8 parts of dehydrating agent, 0.5 parts to 1 part of drying agent, 0.1 parts to 0.3 parts of anti-skinning agent, 3 parts to 6 parts of solvent, and 1 part to 3 parts of diluent; the filler comprises 50 parts to 60 parts of zinc powder, 5 parts-10 parts of mica iron oxide powder and 5 parts-10 parts of sericite powder, the solid content of the modified epoxy ester resin and the modified acrylic resin is 60 parts, the solvent is anhydrous No. 100 solvent, and the diluent is xylene diluent; the adhesion between the coating and the substrate is optimized, the demand for the substrate itself is reduced, the corrosion resistance, weather resistance, salt spray resistance and impact resistance of the coating are improved, it meets environmental protection requirements, and can meet the requirements of quickly repairing rusted substrates.

Description

Technical Field

[0001] The invention relates to the field of coatings, and in particular to an anti-rust coating for maintaining steel structures and pipelines in thermal power plants and a preparation method thereof. Background Art

[0002] The steel structures and pipelines of thermal power plants are exposed to harsh electrochemical and chemical corrosion environments for a long time, and their surfaces are prone to rust and corrosion. Therefore, regular and irregular anti-corrosion maintenance is required for the steel structures and pipelines of thermal power plants.

[0003] A passivation film can be formed on the surface of zinc. This film is corrosion-resistant and can protect the zinc itself and the metal underneath from corrosion. In addition, the electrode potential of zinc is higher than that of iron. When zinc and iron are exposed to the environment at the same time, zinc will be corroded first, thus protecting the iron from corrosion. There are three main types of common zinc-containing anti-corrosion coatings: inorganic zinc powder coatings, epoxy anti-corrosion coatings / epoxy zinc powder coatings, and moisture-curing polyurethane zinc powder coatings.

[0004] Inorganic zinc powder coatings are usually directly applied to the surface of steel substrates, and have poor adhesion to the surface of substrates that have already been corroded. At the same time, inorganic zinc powder coatings also have the defect of being easy to crack, so they are not suitable for anti-rust maintenance.

[0005] Epoxy anti-corrosion coatings / epoxy zinc powder coatings are usually two-component, including a first component containing a main agent and a second component containing a curing agent. For example, the Chinese invention patent with publication number CN110183934A discloses a wear-resistant two-component graphene anti-corrosion coating, including component A and component B, characterized in that: the component A is composed of the following raw materials in parts by weight: 25 to 40 parts of epoxy resin, 15 to 22 parts of solvent, 3 to 5 parts of leveling agent, 2 to 4 parts of defoaming agent, 3 to 5 parts of dispersant, 12 to 16 parts of zinc powder, 10 to 15 parts of heavy calcium carbonate and 20 to 28 parts of modified graphene; the component B is composed of the following raw materials in parts by weight: 10 to 15 parts of curing agent and 5 to 6 parts of solvent. Since the shelf life of the curing agent and the main agent is limited after mixing, this type of paint requires accurate mixing of the first component and the second component when used, and must be used up within the specified available time, which is inconvenient for use on maintenance sites; and it has extremely high requirements for mixing time and mixing process during use, otherwise it is easy to cause the paint to fail to be applied, to form lumps, to crack, etc.; in addition, it will increase some VOC emissions and odors, so it is slightly inferior to single-component paint in terms of environmental protection.

[0006] The main disadvantages of wet-curing polyurethane zinc powder coatings are poor heat resistance, easy blistering, low hardness, and high requirements for the base layer. Among them, in an environment with a temperature higher than 100°C, the performance of wet-curing polyurethane zinc powder coatings will be affected, which is easy to affect the final effect of coating; at the same time, the film-forming material of this type of coating is wet-curing polyurethane. After opening the can, the resin will react quickly when it comes into contact with the air, making it difficult to reuse the remaining material, so the service life after opening the can is short; compared with thermosetting coatings, wet-curing polyurethane zinc powder coatings have lower hardness and relatively poor impact resistance; in addition, when using wet-curing polyurethane zinc powder coatings, some base surface requirements for applying waterproof coatings are relatively high, such as: no visible water (easy to react and cure in advance), no sand, etc., which is not conducive to coating on the surface of the substrate that has been corroded, and increases the preparation work before construction.

[0007] In the actual work of pipeline anti-corrosion maintenance in thermal power plants, in order to simplify maintenance operations, it is necessary to ensure that no topcoat is required after applying the maintenance paint, and to simplify the pretreatment of the substrate as much as possible. At the same time, the maintenance paint is also required to have excellent anti-corrosion performance in subsequent use. Therefore, the anti-rust paint for the maintenance of steel structures and pipelines in thermal power plants needs to have excellent weather resistance, compatibility with uneven rusted substrates, and good corrosion resistance. Summary of the invention

[0008] Therefore, in order to solve the above problems, the present invention provides an anti-rust coating for maintaining steel structures and pipelines in thermal power plants and a preparation method thereof.

[0009] The present invention is achieved through the following technical solutions:

[0010] Anti-rust coatings for the maintenance of steel structures and pipelines in thermal power plants, including the following materials by mass:

[0011]

[0012] The filler comprises 50-60 parts of zinc powder, 5-10 parts of mica iron oxide powder and 5-10 parts of sericite powder. The solid content of the modified epoxy ester resin and the modified acrylic resin are both 60 parts. The solvent is an anhydrous No. 100 solvent, and the diluent is a xylene diluent.

[0013] Preferably, the zinc powder is 800 mesh lead-free zinc powder, the particle size of the mica iron oxide powder is 0.2 μm-0.3 μm, and the particle size of the sericite powder is 1500 mesh.

[0014] Preferably, the mass ratio of the zinc powder, mica iron oxide powder and sericite powder is 10:1:2; the zinc powder is a mixture of flaky zinc powder and spherical zinc powder, and the mixing ratio of the flaky zinc powder to the spherical zinc powder is 3-4:1.

[0015] Preferably, the flaky zinc powder and the spherical zinc powder are both modified zinc powders, the exterior of the modified zinc powder is coated with a PEDOT protective film, and in the modified zinc powder, the mass ratio of zinc powder to PEDOT is 1:0.01-0.15.

[0016] Preferably, the modified epoxy ester resin is Sanmu Chemical 619 epoxy ester resin, and the modified acrylate is produced by Changxing Chemical with a product brand of 60719.

[0017] Preferably, the modified bentonite is produced by Zhejiang Fenghong Company and its model is HFGEL-217.

[0018] Preferably, the anti-settling agent is polyamide wax produced by Kusumoto Chemicals, model number HI-1058 polyamide wax.

[0019] Preferably, it also includes an ultraviolet light absorber, which is produced by Ciba and has a model number of TINUVIN292.

[0020] The method for preparing the anti-rust coating for maintaining the steel structure and pipeline of a thermal power plant comprises the following steps:

[0021] S1: equipped with materials as described above;

[0022] S2: Mix and stir the modified epoxy ester resin and No. 100 solvent, add the modified bentonite and anti-settling agent after stirring evenly, and stir for 15 minutes;

[0023] S3: Add 800 mesh zinc powder, mica iron oxide powder, and sericite powder, stir evenly at high speed, and disperse at high speed for 1 hour until there is no agglomeration;

[0024] S4: Add modified acrylic resin and drying agent, stir evenly and adjust the product viscosity to 80ku-90ku with diluent;

[0025] S5: Add dehydrating agent, stir for 20-30 minutes, filter through 60 mesh, and then can. Add anti-skinning agent on the surface of the coating in the barrel before packaging and capping, and then can. The beneficial effects of the technical solution of the present invention are mainly reflected in:

[0026] 1. Use zinc powder, mica iron oxide powder and sericite powder in a specific proportion as fillers. The content of flaky zinc powder in zinc powder is relatively high. Flaky zinc powder, mica iron oxide and sericite powder all have flaky structures, which have strong covering ability, floating ability, overlapping ability and shielding ability. When the three are mixed, they spread into flaky horizontal rows, with multiple layers of parallel overlapping and surface contact between the flakes. The overlapping of the flake particles hinders the diffusion channel of moisture and corrosive media, further enhancing the adhesion of the filler on the rust surface. , which can effectively improve the conductivity between the filler and the metal substrate and between the filler particles. This structure makes the coating dense, extends the corrosion maze route, optimizes the zinc consumption and coating thickness per unit area, and improves the shielding and corrosion resistance of the coating. At the same time, sericite powder has excellent insulation, resistance to ultraviolet radiation, weather resistance, fire resistance, chemical stability and gloss, and is especially suitable for outdoor coatings. It is beneficial to delay the aging of the paint film. By strictly adjusting the ratio of the three fillers, the protective performance of the coating can be optimized as much as possible.

[0027] 2. Add some spherical zinc powder while adding flaky zinc powder. On the one hand, the spherical zinc powder and other types of flaky fillers (flaky zinc powder, mica iron oxide and sericite powder) form an overlapping structure, thereby improving the corrosion resistance of the coating, improving the mechanical strength of the coating after curing, improving the wear resistance of the coating, and increasing the bonding force of the coating on the surface of the metal substrate. At the same time, the addition of spherical zinc powder further increases the distance for water and corrosive media to penetrate through the coating, further improving the corrosion resistance and shielding effect of the coating; on the other hand, the addition of spherical zinc powder can increase the dispersion and stability of each flaky filler in the coating.

[0028] 3. Modified epoxy ester resin and modified acrylic resin are used as the main film-forming substances. Modified epoxy ester resin provides very good adhesion and has relatively low requirements for the treatment of rusty substrates, especially for slightly rusty substrates with paint films. Modified epoxy ester resin also has very good compatibility with zinc powder and other powder materials, making the coating have excellent storage stability. Combining modified acrylic resin with modified epoxy ester resin enhances the weather resistance of the coating after curing, making the paint film less likely to crack and fall off. At the same time, the solid content of modified epoxy ester resin and modified acrylic resin is 60 parts. The coating has good mechanical properties, high adhesion, wear resistance, chemical stability, and can remain stable at a temperature as high as 130°C, and can be suitable for surface repair and repainting of corroded outdoor substrates; in addition, the present invention forms a single-component coating with modified epoxy ester resin and modified acrylic resin as film-forming substances, and strictly controls the ratio of film-forming substances to fillers, which can effectively reduce the volatility of the coating system, the content of organic compounds and the curing energy consumption, so that the VOC content of the coating is ≤400g / L, which meets the environmental protection requirements and the requirements for reducing and exempting product consumption taxes.

[0029] 4. In a preferred embodiment, both the flaky zinc powder and the spherical zinc powder are modified zinc powders coated with a PEDOT protective film on the outside. On the one hand, the PEDOT protective film on the outside of the zinc powder has excellent conductive properties, and the PEDOT protective film reduces the electrochemical activity of the zinc powder by modifying the surface of the zinc powder, thereby delaying its corrosion time, extending the service life of the coating, and increasing the cathodic protection effect of the coating; on the other hand, PEDOT has good hydrophilic properties, and thus can further increase the water absorption of the coating, effectively isolate the corrosive medium, and thus inhibit corrosion. Furthermore, PEDOT can further increase the adhesion and flexibility of the coating, improve the bonding strength between the coating and the substrate, and improve the protective effect of the coating.

[0030] 5. Use anhydrous No. 100 solvent and anhydrous diluent, and finally add a dehydrating agent to make the coating product basically free of water, avoid premature reaction of water with zinc powder and the PEDOT protective film on the surface of modified zinc powder, improve the storage stability of the product and the anti-rust ability of zinc powder. At the same time, the elimination of moisture in the product coating can make the solvent have better dissolving ability, reduce the use of solvents, and effectively reduce volatile organic compounds. Add anti-skinning agent to the surface of the coating in the barrel before packaging and sealing, which avoids the coating from skinning in the barrel, improves the storage stability of the product, avoids the coating from forming a hard crust during storage and transportation, and improves the overall effect of the product. DETAILED DESCRIPTION

[0031] In order to make the purpose, advantages and features of the present invention more clearly and in detail, the following non-limiting description of the preferred embodiment will be used for explanation. The embodiment is only a typical example of the application of the technical solution of the present invention, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0032] In addition, the terms "first" and "second" in this solution are only used for descriptive purposes and cannot be understood as indicating or implying the order of importance, or implicitly indicating the number of technical features shown. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Anti-rust coatings for the maintenance of steel structures and pipelines in thermal power plants, including the following materials by mass:

[0034]

[0035] The filler includes 50-60 parts of zinc powder, 5-10 parts of mica iron oxide powder and 5-10 parts of sericite powder. Mica iron oxide is a material with good chemical stability and strong sunlight reflection. It has excellent anti-rust performance and is widely used in the pigment of anti-rust paint. It has strong adhesion and is non-toxic. It can effectively slow down the aging of the paint film and provide long-term anti-corrosion effect. By replacing part of the zinc powder with mica iron oxide, not only can the cost be reduced, but also the anti-corrosion effect can be improved. At the same time, the mica iron oxide overlaps each other in scales, making the diffusion channel of moisture and corrosive media The rust resistance of the coating is improved; sericite powder has excellent insulation, anti-ultraviolet radiation, weather resistance, fire retardant, chemical stability and gloss, and is especially suitable for outdoor coatings, which is beneficial to delaying the aging of the paint film. By strictly adjusting the ratio of the three fillers, the protective performance of the coating can be optimized as much as possible. At the same time, the addition of sericite can improve the physical and mechanical properties of the coating, such as hardness and impact resistance. This is because the flaky filler of sericite plays a role in the coating similar to that of sand and stone in concrete, which enhances the overall strength and durability of the coating.

[0036] The solid contents of the modified epoxy ester resin and the modified acrylic resin are both 60 parts, the solvent is an anhydrous No. 100 solvent, and the diluent is a xylene diluent.

[0037] The method for preparing the anti-rust coating for maintaining the steel structure and pipeline of a thermal power plant comprises the following steps:

[0038] S1: equipped with materials as described above;

[0039] S2: Mix and stir the modified epoxy ester resin and No. 100 solvent, add the modified bentonite and anti-settling agent after stirring evenly, and stir for 15 minutes;

[0040] S3: Add 800 mesh zinc powder, mica iron oxide powder, and sericite powder, stir evenly at high speed, and disperse at high speed for 1 hour until there is no agglomeration;

[0041] S4: Add modified acrylic resin and drying agent, stir evenly, and then use diluent to adjust the product viscosity to 80ku-90ku. At this time, the product has good fluidity and viscosity;

[0042] S5: Add dehydrating agent, stir for 20-30 minutes, filter through 60 mesh, and then can. Add anti-skinning agent on the surface of the paint in the barrel before packaging and sealing, and then can.

[0043] According to the above formula and preparation steps, the samples of the following Examples 1 to 3 were obtained; at the same time, different formulas were provided and the same steps were adopted to prepare the samples of Comparative Examples 1 to 6;

[0044] Table 1: Ratios of raw materials used in Examples 1-3 and Comparative Examples 1-6:

[0045]

[0046]

[0047] In Examples 1 to 3 in Table 1, the zinc powder is 800 mesh lead-free zinc powder, the particle size of the mica iron oxide powder is 0.2 μm-0.3 μm, the particle size of the sericite powder is 1500 mesh, and the zinc powder is a mixture of flaky zinc powder and spherical zinc powder, and the mixing ratio of the flaky zinc powder to the spherical zinc powder is 3-4:1; wherein, in Examples 2 and 3, the mass ratio of the zinc powder, mica iron oxide powder and sericite powder is 12:1:1; the fillers of Comparative Examples 1 to 4 and Comparative Example 6 are all zinc powder, and in the filler of Comparative Example 5, the mass ratio of the zinc powder, mica iron oxide powder and sericite powder is 8:3:3.

[0048] In addition, in Examples 1 to 3, the modified epoxy ester resin is Sanmu Chemical 619 epoxy ester resin, the modified acrylate is produced by Changxing Chemical, the product brand is 60719, the modified bentonite is produced by Zhejiang Fenghong Company, the model is HFGEL-217, the anti-settling agent is polyamide wax, produced by Nanben Chemical, the model is HI-1058 polyamide wax, and also includes an ultraviolet absorber, which is produced by Ciba, the model is TINUVIN292.

[0049] The main differences between the above-mentioned Example 1 (Example 1 is a preferred embodiment of the present invention) and Example 3 are: 1) in Example 1, the mass ratio of the zinc powder, mica iron oxide powder and sericite powder is 10:1:2; 2) in Example 1, the flaky zinc powder and the spherical zinc powder are both modified zinc powders, and the outside of the modified zinc powder is coated with a PEDOT protective film. In the modified zinc powder, the mass ratio of zinc powder to PEDOT is 1:0.01-0.15.

[0050] The modified zinc powder can be prepared by the following steps:

[0051] Ⅰ: PEDOT:PSS is dispersed in a solvent to form a PEDOT dispersion, wherein the solvent is anhydrous ethanol or water, and the amount of the solvent can be adjusted according to actual needs, so as to fully disperse PEDOT:PSS, which will not be described in detail here;

[0052] II: Mix the flake / spherical lead-free zinc powder into the PEDOT dispersion to form a mixed solution, and grind and mix by a ball mill until the solid particle size in the mixed solution does not exceed 800 mesh;

[0053] III: The mixed and ground mixed liquid is filtered and dried to obtain modified zinc powder coated with a PEDOT film, wherein the drying process is vacuum drying, the drying temperature is 65-80° C., the drying time is 10 h-24 h, and the vacuum dried modified zinc powder is further sieved for standby use.

[0054] Adhesion, impact resistance, weather resistance and salt spray resistance were tested for the products of the above embodiments and comparative examples respectively; wherein, the adhesion test was conducted according to the national standard GB / T 5210 "Adhesion test for paints and varnishes by pull-off method", and the unit was MPa; the impact resistance test was conducted according to the national standard GB / T 1732 "Determination of impact resistance of paint film", and the maximum height of the free fall of the heavy hammer onto the punch was 50 cm; the salt spray resistance test was conducted according to the national standard GB / T 10125 "Artificial atmosphere corrosion test salt spray test"; the weather resistance test was conducted according to the national standard GB / T 1865-2009 "Artificial weathering and artificial radiation exposure of paints and varnishes to filtered xenon arc radiation", and the condition of the coating within 500 hours was recorded and evaluated according to the following standards:

[0055] Grade A: Meet the following conditions at the same time: no blistering, no rusting, no cracking, no falling off, discoloration ≤ Grade 1, powdering ≤ Grade 1;

[0056] Grade B: Any of the following conditions occurs: slight blistering, slight rusting, slight cracking, slight shedding, discoloration level 2, powdering level 2;

[0057] Grade C: Any of the following conditions occurs: obvious blistering, obvious rusting, obvious cracking, obvious shedding, discoloration level 3, powdering level 3;

[0058] Grade D: Any of the following conditions occurs: severe blistering, severe rusting, severe cracking, severe shedding, discoloration level 4, powdering level 4.

[0059] According to the above tests, the test results shown in Table 2 are obtained:

[0060] Table 2: Adhesion, impact resistance and weather resistance test results of the coatings formed by the products of Example 1 to Example 3 and Comparative Example 1 to Comparative Example 6;

[0061]

[0062] According to the above test results, Examples 1 to 3 have good adhesion, impact resistance and weather resistance. On the one hand, since Examples 1 to 3 all use zinc powder, mica iron oxide powder and sericite powder mixed in a specific proportion to make fillers, and the zinc powder is obtained by mixing flaky zinc powder and spherical zinc powder in a specific proportion, on the one hand, the overlapping structure formed between the flaky fillers can enhance the adhesion and shielding effect, and on the other hand, the spherical zinc powder is mixed and superimposed between the flaky fillers, which improves the density and mechanical properties of the filler in the product, making it have more excellent impact resistance. Example 1 uses modified zinc The zinc powder is modified to reduce the electrochemical activity of the zinc powder, effectively isolate the corrosive medium, thereby inhibiting corrosion, delaying the corrosion time of the zinc powder, extending the service life of the coating, and increasing the cathodic protection effect of the coating. At the same time, the adhesion and flexibility of the coating are further increased, the bonding force between the coating and the substrate is improved, and the protective effect of the coating is improved. Therefore, in the filler of the product of Example 1, even if the mass ratio of the zinc powder is less than the mass ratio of the zinc powder in the products of Example 2 and Example 3, its adhesion on the substrate, weather resistance and salt spray resistance are better than those of the products of Example 2 and Example 3.

[0063] On this basis, since modified epoxy ester resin and modified acrylic resin are used as the main film-forming substances in Examples 1 to 3 to prepare single-component coatings, and the ratio of the film-forming substance to the filler is strictly controlled, the volatile organic compound content and curing energy consumption of the coating system can be effectively reduced, the construction is more convenient, and the VOC content of the product is ensured to be ≤400g / L, which meets the environmental protection requirements and the requirements for reducing or exempting product consumption tax.

[0064] Among them, in Comparative Example 1, no modified epoxy ester resin was added, and the film-forming substance was mainly modified acrylic resin, which had high hardness but poor adhesion and corrosion resistance. Therefore, its adhesion on the substrate and salt spray resistance did not meet the standards; although modified epoxy ester resin was added in Comparative Example 2, its content was too low, so its defects were similar to those of Comparative Example 1; in Comparative Example 6, no modified acrylic resin was added, and the film-forming substance was mainly modified epoxy ester resin. Therefore, although its adhesion to the substrate was good, the coating was prone to cracking and falling off, and the weather resistance was poor. The performance is poor; in Comparative Examples 3 and 4, the modified epoxy ester resin and the modified acrylic resin are added in the same proportion. At this time, the product adhesion, impact resistance and weather resistance all meet the standards, but due to the high proportion of the modified acrylic resin, its salt spray resistance is significantly poor, and the product mechanical properties and leveling are also poor; in Comparative Example 5, various test performances are improved compared with other comparative examples, but the zinc powder content in its filler is low, and the content of modified epoxy ester resin is also low compared with Examples 1 to 3, so the salt spray resistance is relatively poor.

[0065] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. Anti-rust coating for steel structure and pipeline maintenance in thermal power plants, characterized by: Includes the following materials by mass: 12-18 parts of modified epoxy ester resin; 2-6 parts of modified acrylic resin; Filler 60-80 parts; 1-2 parts of modified bentonite; 1-2 parts of anti-settling agent; Dehydrating agent 0.2-0.8 parts; 0.5-1 part of drying agent; Anti-skinning agent 0.1-0.3 parts; 3-6 parts of solvent; 1-3 parts of diluent; The filler comprises 50-60 parts of zinc powder, 5-10 parts of mica iron oxide powder and 5-10 parts of sericite powder. The solid content of the modified epoxy ester resin and the modified acrylic resin is 60 parts. The solvent adopts anhydrous No. 100 solvent, and the diluent is xylene diluent. The zinc powder is a mixture of flaky zinc powder and spherical zinc powder, and the mixing ratio of the flaky zinc powder to the spherical zinc powder is 3-4:

1. The flaky zinc powder and the spherical zinc powder are both modified zinc powders, and the outside of the modified zinc powder is coated with a PEDOT protective film. In the modified zinc powder, the mass ratio of zinc powder to PEDOT is 1:0.01-0.

15.

2. The anti-rust coating for maintaining steel structures and pipelines in thermal power plants according to claim 1 is characterized by: The zinc powder is 800 mesh lead-free zinc powder, the particle size of the mica iron oxide powder is 0.2 μm-0.3 μm, and the particle size of the sericite powder is 1500 mesh.

3. The anti-rust coating for maintaining steel structures and pipelines in thermal power plants according to claim 2 is characterized by: The mass ratio of the zinc powder, mica iron oxide powder and sericite powder is 10:1:

2.

4. The anti-rust coating for maintaining steel structures and pipelines in thermal power plants according to claim 1 is characterized by: The modified epoxy ester resin is 619 epoxy ester resin produced by Sanmu Chemical, and the modified acrylate is produced by Changxing Chemical, with a product brand of 60719.

5. The anti-rust coating for maintaining steel structures and pipelines in thermal power plants according to claim 1 is characterized by: The modified bentonite is produced by Zhejiang Fenghong Company and its model is HFGEL-217.

6. The anti-rust coating for maintaining steel structures and pipelines in thermal power plants according to claim 1 is characterized by: The anti-settling agent is polyamide wax produced by Kusumoto Chemical Industry Co., Ltd., and the model number is HI-1058 polyamide wax.

7. The anti-rust coating for maintaining steel structures and pipelines in thermal power plants according to claim 1 is characterized by: The invention also comprises an ultraviolet light absorber, which is produced by Ciba and has a model number of TINUVIN292.

8. A method for preparing an anti-rust coating for maintaining steel structures and pipelines in thermal power plants, characterized in that: The following steps are involved: S1: equipped with the material as described in any one of claims 1-7; S2: Mix and stir the modified epoxy ester resin and No. 100 solvent, add the modified bentonite and anti-settling agent after stirring evenly, and stir for 15 minutes; S3: Add 800 mesh zinc powder, mica iron oxide powder, and sericite powder, stir evenly at high speed, and disperse at high speed for 1 hour until there is no agglomeration; S4: Add modified acrylic resin and drying agent, stir evenly and adjust the product viscosity to 80ku-90ku with diluent; S5: Add dehydrating agent, stir for 20-30 minutes, filter through 60 mesh, and then can. Add anti-skinning agent on the surface of the paint in the barrel before packaging and sealing, and then can.

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