Long-acting corrosion-resistant high-temperature-resistant coating and preparation method thereof

Abstract

The invention provides a long-acting corrosion-resistant high-temperature-resistant coating and a preparation method thereof, and the long-acting corrosion-resistant high-temperature-resistant coating comprises the following components in parts by weight: 40-60 parts of epoxy POSS (polyhedral oligomeric silsesquioxane) modified organic silicon resin, 5-10 parts of zinc powder, 4-8 parts of glass powder, 3-8 parts of high-temperature-resistant filler, 0.5-1 part of a flatting agent, 0.5-1 part of a defoaming agent and 0.5-1 part of a thixotropic agent. The high-temperature-resistant coating can be used on the surface of a metal base material serving within the temperature range of 400-650 DEG C for a long time, has good corrosion resistance before and after heat resistance, and can guarantee effective protection on the base material.

Description

Technical Field

[0001] The present invention relates to the technical field of high temperature resistant coatings, and more specifically to a long-lasting corrosion resistant and high temperature resistant coating and a preparation method thereof. Background Art

[0002] High temperature resistant coatings can be used for a long time at temperatures above 200°C without cracking or damage, and can still maintain certain physical and chemical properties, so that the protected object can still function normally under high temperature conditions. Due to its excellent protective properties, high temperature resistant coatings are widely used in civil and military fields, such as high temperature refining equipment, heat exchangers, gas turbine blades, aircraft exhaust pipes, engine tail nozzles, etc.

[0003] Among the many high-temperature resistant coatings, silicone high-temperature resistant coatings have good weather resistance, medium resistance, insulation and excellent thermal stability brought by the Si-O-Si main chain structure. At the same time, compared with inorganic high-temperature resistant coatings, silicone high-temperature resistant coatings have a more convenient construction process, making them the most widely used high-temperature resistant coatings. However, with the rapid development of the industrial field, not only is the temperature tolerance of silicone high-temperature resistant coatings required to be further improved, but silicone high-temperature resistant coatings are also required to have a longer service life. In addition, for some special application scenarios, such as gas turbines, shipborne equipment, offshore high-temperature refining equipment, etc., silicone high-temperature resistant coatings are also required to have excellent corrosion resistance.

[0004] After a long period of development, the operating temperature range of silicone heat-resistant coatings has expanded to 300-700°C. Some special silicone heat-resistant coatings can even withstand high temperatures of 800-900°C for a short time. However, for use in environments with temperatures above 600°C, the service life of silicone heat-resistant coatings is still slightly insufficient. In terms of corrosion resistance, most silicone heat-resistant coatings focus more on corrosion resistance before heat resistance, while relatively little research has been done on corrosion resistance after heat resistance. For silicone heat-resistant coatings, silicone resin film-forming materials usually undergo resin degradation and destruction within the temperature range of 300-400°C. The higher the temperature, the faster the degradation rate of the silicone resin film-forming materials, which will eventually lead to defects in larger areas on the film-forming materials, thereby rendering the protective effect provided by the silicone resin film-forming materials ineffective. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is that the existing organosilicon high temperature resistant coating has low high temperature resistance and its corrosion resistance decreases with the increase of ambient temperature.

[0007] (II) Technical solution

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] In a first aspect, the present invention provides a long-lasting corrosion-resistant and high-temperature resistant coating, which comprises, by weight: 40 to 60 parts of epoxy POSS modified silicone resin, 5 to 10 parts of zinc powder, 4 to 8 parts of glass powder, 3 to 8 parts of high-temperature resistant filler, 0.5 to 1 part of leveling agent, 0.5 to 1 part of defoaming agent, and 0.5 to 1 part of thixotropic agent.

[0010] Preferably, the epoxy POSS modified silicone resin includes at least one of a cyclohexyl epoxy POSS modified silicone resin and a glycidyl ether POSS modified silicone resin.

[0011] Preferably, the zinc powder comprises at least one of 600 mesh, 800 mesh, 1250 mesh, and 3000 mesh flake zinc powder.

[0012] Preferably, the glass powder includes at least one of 600 mesh, 800 mesh, 1250 mesh, 3000 mesh, and 5000 mesh glass powder.

[0013] Preferably, the melting point of the glass powder is 450-500°C.

[0014] Preferably, the high temperature resistant filler includes at least one of talc powder, mica powder, titanium dioxide, zirconium oxide, and silicon carbide.

[0015] Preferably, the leveling agent includes at least one of BYK-306, BYK-310 and BYK-330.

[0016] Preferably, the defoaming agent includes at least one of BYK-066N, BYK-077 and BYK-085.

[0017] Preferably, the thixotropic agent is R972 type fumed silica.

[0018] In a second aspect, the present invention further provides a method for preparing a long-lasting corrosion-resistant and high-temperature resistant coating, which is used to prepare the long-lasting corrosion-resistant and high-temperature resistant coating described in any one of the above technical solutions, and the preparation method comprises the following steps:

[0019] The epoxy POSS modified silicone resin and the high temperature resistant filler are uniformly mixed according to a ratio to form a first dispersion;

[0020] Adding glass powder, zinc powder, leveling agent and thixotropic agent to the first dispersion in order according to the ratio, and mixing them evenly to form a second dispersion;

[0021] ball-milling the second dispersion and sieving it through a sieve to obtain a third dispersion;

[0022] The defoamer is added to the third dispersion according to the ratio, dispersed evenly, and a long-lasting corrosion-resistant and high-temperature-resistant coating is obtained.

[0023] (III) Beneficial effects

[0024] The above technical solution of the present invention has at least the following advantages:

[0025] (1) The present invention is suitable for coating on the surface of an aircraft to improve the high temperature resistance and corrosion resistance of the aircraft. Among them, the present invention uses epoxy POSS modified silicone resin as a film-forming material for silicone high temperature resistant coating. POSS is a silsesquioxane with a cage structure. The cage structure makes POSS have excellent thermal stability, which can improve the thermal stability of the modified silicone resin; the epoxy POSS used in the present invention is an eight-arm cage silsesquioxane, which can be used as a cross-linking point to cross-link with multiple silicone molecular chains to improve the cohesive energy of the modified silicone resin and further increase the thermal stability of the modified silicone resin. Based on the above advantages, the thermal decomposition temperature of the epoxy POSS modified silicone resin used can reach above 390°C. In comparison, the decomposition temperature of most silicone resins or modified silicone resins is around 300°C. The epoxy POSS modified silicone resin film-forming material used in the present invention has more excellent heat resistance, which improves the heat resistance of the coating from the intrinsic direction.

[0026] (2) The thermal decomposition temperature of the epoxy POSS modified silicone resin used in the present invention is above 390°C. When the temperature exceeds 390°C, the resin begins to thermally degrade, and defects will occur in the thermally degraded area; when the temperature is less than 450°C, the speed of thermal degradation of the resin is relatively slow, and the defects produced are relatively few. In the temperature range of 390°C to 450°C, the zinc powder in the components of the present invention begins to melt. Since the aircraft is in a state of continuous movement in the air, the molten zinc powder can flow and fill in the small defects produced by the decomposition of the resin, reduce the defects inside the coating, and ensure the protective effect of the coating; when the temperature is higher than 450°C, the thermal degradation of the resin is violent, and large defects are easily formed. The melting point of the glass powder used in the present invention is 450-500°C. At this time, the glass powder melts, which can make up for the defects caused by the decomposition of the resin and further ensure the protective effect of the coating. Therefore, the long-lasting corrosion-resistant and high-temperature resistant coating of the present invention has a wide range of use temperature and a long service life.

[0027] (3) The epoxy POSS modified silicone resin used in the present invention has the characteristics of epoxy resin, has good compatibility with the substrate (generally titanium alloy), can improve the adhesion to the substrate, and epoxy POSS modification can further improve the corrosion resistance of the silicone resin, ensuring the corrosion resistance of the long-term corrosion-resistant and high-temperature resistant coating at room temperature or before heat resistance. In addition, since the filler used in the present invention can make up for the defects caused by resin decomposition under different temperature conditions during the high-temperature process, the integrity of the coating is guaranteed, the coating can isolate the substrate from the external environment, avoid direct contact between the external environment and the substrate, and then protect the substrate. The long-term corrosion-resistant and high-temperature resistant coating of the present invention still has good corrosion resistance after high-temperature service. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic flow chart of a method for preparing a long-lasting corrosion-resistant and high-temperature-resistant coating provided in an embodiment of the present invention.

[0030] Figure 2 These are appearance photos of the long-lasting corrosion-resistant and high-temperature resistant coating provided by the embodiments of the present invention and the comparative example after high-temperature resistance testing. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, and do not indicate that a device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The specific implementation of the present invention is described in more detail below in conjunction with specific embodiments:

[0035] The embodiment of the present invention provides a long-lasting corrosion-resistant and high-temperature resistant coating, which includes, by weight: 40 to 60 parts of epoxy POSS (polyhedral oligomericsilsequioxane) modified silicone resin, 5 to 10 parts of zinc powder, 4 to 8 parts of glass powder, 3 to 8 parts of high-temperature resistant filler, 0.5 to 1 part of leveling agent, 0.5 to 1 part of defoaming agent, and 0.5 to 1 part of thixotropic agent. Among them, the leveling agent is a type of substance that can effectively reduce the surface tension of the coating liquid and improve its leveling and uniformity. It can improve the permeability of the coating liquid, reduce the possibility of spots and scars when brushing, increase coverage, and make the film formation uniform and natural. The defoaming agent is a substance with low surface tension and high surface activity that can inhibit or eliminate foam in the system. A thixotropic agent refers to a type of compounding agent that utilizes the thixotropic effect to make the glue paint have a higher viscosity when static, thereby preventing the glue paint from sagging. Adding a thixotropic agent to the resin can make the resin glue have a higher viscosity when static, and turn it into a low-viscosity fluid under the action of external force.

[0036] In the present invention, epoxy POSS is used to modify the organosilicon resin to form epoxy POSS modified organosilicon resin, which can increase the melting point of the organosilicon resin to above 390°C, while the melting point of zinc powder is 419.53°C, the melting point of zinc powder is just after the temperature at which the resin undergoes thermal decomposition, and the zinc powder has good compatibility with the epoxy POSS modified organosilicon resin. When the ambient temperature reaches 390°C to 450°C, the zinc powder begins to melt. Since the aircraft is in a state of continuous motion in the air, the melted zinc powder can flow and fill in the tiny defects caused by the decomposition of the resin, reduce the defects inside the coating, ensure the integrity of the coating, and further improve the protective effect of the coating; when the temperature is higher than 450°C, the zinc powder is oxidized to form zinc oxide, and the zinc oxide still remains in the coating to protect the substrate. At this time, the resin undergoes severe thermal degradation and is prone to form larger defects. The melting point of the glass powder used in the present invention is 450-500°C, and the glass powder melts at this time, which can make up for the defects caused by the decomposition of the resin and further ensure the protective effect of the coating. The long-lasting corrosion-resistant and high-temperature resistant coating of the present invention has a wide operating temperature range. In a high-temperature environment with gradually rising temperature, the defects caused by the thermal decomposition of the resin are filled by melting different components in different temperature ranges, thereby ensuring the integrity of the coating, thereby ensuring that the coating has good heat resistance and corrosion resistance in a wider temperature range.

[0037] In one embodiment, the epoxy POSS modified silicone resin includes at least one of a cyclohexyl epoxy POSS modified silicone resin and a glycidyl ether POSS modified silicone resin.

[0038] In one embodiment, the zinc powder includes at least one of 600 mesh, 800 mesh, 1250 mesh, and 3000 mesh flake zinc powder.

[0039] In one embodiment, the glass powder includes at least one of 600 mesh, 800 mesh, 1250 mesh, 3000 mesh, and 5000 mesh glass powder.

[0040] In one embodiment, the melting point of the glass powder is 450-500°C.

[0041] In one embodiment, the high temperature resistant filler includes at least one of talcum powder, mica powder, titanium dioxide, zirconium oxide, and silicon carbide. Specifically, the high temperature resistant filler can improve the overall mechanical properties of the coating or change the color of the coating. By adding a high temperature resistant filler containing specific ingredients, the final coating can have a specific color, which can be selected according to actual needs.

[0042] In one embodiment, the leveling agent includes at least one of BYK-306, BYK-310, and BYK-330.

[0043] In one embodiment, the defoaming agent includes at least one of BYK-066N, BYK-077, and BYK-085.

[0044] In one embodiment, the thixotropic agent is R972 type fumed silica.

[0045] like Figure 1 As shown, the present invention also provides a method for preparing a long-lasting corrosion-resistant and high-temperature resistant coating, which is used to prepare any of the long-lasting corrosion-resistant and high-temperature resistant coatings in the above embodiments, and the preparation method comprises the following steps:

[0046] The epoxy POSS modified silicone resin and the high temperature resistant filler are uniformly mixed according to a ratio to form a first dispersion;

[0047] Adding glass powder, zinc powder, leveling agent and thixotropic agent to the first dispersion in order according to the ratio, and mixing evenly to form a second dispersion;

[0048] ball milling the second dispersion, and sieving it through a sieve to obtain a third dispersion;

[0049] The defoamer is added to the third dispersion according to the ratio, dispersed evenly, and a long-lasting corrosion-resistant and high-temperature-resistant coating is obtained.

[0050] To facilitate the explanation of the implementation principle of the present application, the following is an explanation in conjunction with specific embodiments (the parts in the embodiments are all calculated by weight):

[0051] Embodiment 1:

[0052] The preparation method of the long-lasting corrosion-resistant and high-temperature-resistant coating provided in this embodiment comprises the following steps:

[0053] (1) first, 50 parts of cyclohexyl epoxy POSS modified silicone resin, 3 parts of talcum powder, and 3 parts of titanium dioxide are added to a dispersion tank, and dispersed at a rotating speed of 800 rev / min for 30 minutes to form a first dispersion; 4 parts of 3000 mesh glass powder are added to the above-mentioned first dispersion, and dispersed at a rotating speed of 800 rev / min for 30 minutes to form a uniform state; 6 parts of 1250 mesh zinc powder are added to the above-mentioned dispersion, and dispersed at a rotating speed of 600 rev / min for 60 minutes to form a uniform dispersion;

[0054] (2) adding 0.5 parts of BYK-306 leveling agent and 0.5 parts of R972 thixotropic agent to the above dispersion, dispersing at a speed of 600 rpm for 20 minutes until the dispersion is uniform, to form a second dispersion;

[0055] (3) transferring the second dispersion to a ball mill and milling at a speed of 300 rpm for 1.5 hours. After the ball milling, sieving with a 30 μm sieve to obtain a third dispersion, which was transferred to a dispersion tank;

[0056] (4) Finally, BYK-066N defoamer was added to the third dispersion liquid, and dispersed to a uniform state at a rotation speed of 600 rpm to obtain a long-lasting corrosion-resistant and high-temperature-resistant coating.

[0057] Embodiment 2:

[0058] The preparation method of the long-lasting corrosion-resistant and high-temperature-resistant coating provided in this embodiment comprises the following steps:

[0059] (1) first, 50 parts of glycidyl ether POSS modified silicone resin, 3 parts of mica powder, and 3 parts of zirconium oxide are added to a dispersion tank, and dispersed at a speed of 800 rpm for 30 minutes to form a first dispersion; 5 parts of 3000 mesh glass powder are added to the first dispersion, and dispersed at a speed of 800 rpm for 30 minutes to form a uniform state; 8 parts of 800 mesh zinc powder are added to the dispersion, and dispersed at a speed of 600 rpm for 60 minutes to form a uniform dispersion;

[0060] (2) adding 1 part of BYK-310 leveling agent and 1 part of R972 thixotropic agent to the above dispersion, dispersing at a speed of 600 rpm for 20 minutes until the dispersion is uniform, to form a second dispersion;

[0061] (3) transferring the second dispersion to a ball mill and milling at a speed of 300 rpm for 1.5 hours. After the ball milling, sieving with a 30 μm sieve to obtain a third dispersion, which was transferred to a dispersion tank;

[0062] (4) Finally, BYK-077 defoamer was added to the third dispersion and dispersed at a speed of 600 rpm until it was uniform, thereby obtaining a long-lasting corrosion-resistant and high-temperature-resistant coating.

[0063] Embodiment 3:

[0064] The preparation method of the long-lasting corrosion-resistant and high-temperature-resistant coating provided in this embodiment comprises the following steps:

[0065] (1) first 60 parts of cyclohexyl epoxy POSS modified silicone resin, 4 parts of talcum powder, and 3 parts of silicon carbide are added to a dispersion tank, and dispersed at a rotating speed of 1000 rev / min for 30 minutes to form a first dispersion; 6 parts of 5000 mesh glass powder are added to the above-mentioned first dispersion, and dispersed at a rotating speed of 1000 rev / min for 30 minutes to form a uniform state; 8 parts of 3000 mesh zinc powder are added to the above-mentioned dispersion, and dispersed at a rotating speed of 800 rev / min for 60 minutes to form a uniform dispersion;

[0066] (2) adding 1 part of BYK-330 leveling agent and 1 part of R972 thixotropic agent to the above dispersion, dispersing at a speed of 600 rpm for 20 minutes until the dispersion is uniform, to form a second dispersion;

[0067] (3) transferring the second dispersion to a ball mill and ball milling at 350 rpm for 2 hours. After ball milling, sieving with a 30 μm sieve to obtain a third dispersion, which was then transferred to a dispersion tank.

[0068] (4) Finally, BYK-085 defoamer was added to the third dispersion liquid, and dispersed to a uniform state at a rotation speed of 600 rpm to obtain a long-lasting corrosion-resistant and high-temperature-resistant coating.

[0069] Embodiment 4:

[0070] The preparation method of the long-lasting corrosion-resistant and high-temperature-resistant coating provided in this embodiment comprises the following steps:

[0071] (1) first, 60 parts of glycidyl ether POSS modified silicone resin, 4 parts of talcum powder, and 4 parts of zirconium oxide are added to a dispersion tank, and dispersed at a speed of 1000 rpm for 30 minutes to form a first dispersion; 6 parts of 3000 mesh glass powder are added to the above-mentioned first dispersion, and dispersed at a speed of 1000 rpm for 30 minutes to form a uniform state; 8 parts of 1250 mesh zinc powder are added to the above-mentioned dispersion, and dispersed at a speed of 800 rpm for 60 minutes to form a uniform dispersion;

[0072] (2) adding 1 part of BYK-310 leveling agent and 1 part of R972 thixotropic agent to the above dispersion, dispersing at a speed of 600 rpm for 20 minutes until the dispersion is uniform, to form a second dispersion;

[0073] (3) transferring the second dispersion to a ball mill and ball milling at 350 rpm for 2 hours. After ball milling, sieving with a 30 μm sieve to obtain a third dispersion, which was then transferred to a dispersion tank.

[0074] (4) Finally, BYK-066N defoamer was added to the third dispersion liquid, and dispersed to a uniform state at a rotation speed of 600 rpm to obtain a long-lasting corrosion-resistant and high-temperature-resistant coating.

[0075] Examples 1 to 4 and the comparative example (commercially available organosilicon high temperature resistant coating) were prepared into films on a titanium alloy substrate for performance comparison:

[0076] like Figure 2 As shown, after the long-lasting corrosion-resistant and high-temperature resistant coatings of Examples 1 to 4 withstand a high temperature of 600°C for 500 hours (in the figure, Figure a corresponds to Example 1, Figure b corresponds to Example 2, Figure c corresponds to Example 3, Figure d corresponds to Example 4, and Figure e corresponds to the comparative example), the surface state remains intact, and no obvious cracking, bubbling and other defects occur. After the high-temperature resistant coating of the comparative example withstands a high temperature of 600°C for 200 hours, a large number of fine cracks appear on the surface, proving that the long-lasting corrosion-resistant and high-temperature resistant coating provided by the present invention has excellent heat resistance.

[0077] In addition, a cross-cut adhesion test was performed on the long-lasting corrosion-resistant and high-temperature resistant coatings of Examples 1 to 4. After withstanding a high temperature of 600°C for 500 hours, the cross-cut adhesion of Examples 1 to 4 was still maintained at a level of ≤ Grade I, indicating that the long-lasting corrosion-resistant and high-temperature resistant coating provided by the present invention can still maintain a strong bonding force with the substrate after heat resistance, thereby ensuring the protective effect on the substrate.

[0078] The long-lasting corrosion-resistant and high-temperature resistant coatings of Examples 1 to 4 were subjected to a neutral salt spray test. After withstanding a high temperature of 600°C for 100 hours, Examples 1 to 4 were subjected to a neutral salt spray test for 720 hours, and their surface conditions remained intact, indicating that the long-lasting corrosion-resistant and high-temperature resistant coatings provided by the present invention have excellent anti-corrosion effects.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A long-lasting corrosion-resistant and high-temperature resistant coating, characterized in that: In parts by weight: 40-60 parts of epoxy POSS modified silicone resin; 5-10 parts of zinc powder; 4-8 parts of glass powder; 3 to 8 parts of high temperature resistant filler; 0.5-1 part of leveling agent; Defoaming agent 0.5-1 part; Thixotropic agent 0.5 to 1 part.

2. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 1, characterized in that: The epoxy POSS modified silicone resin includes at least one of a cyclohexyl epoxy POSS modified silicone resin and a glycidyl ether POSS modified silicone resin.

3. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 1, characterized in that: The zinc powder includes at least one of 600 mesh, 800 mesh, 1250 mesh, and 3000 mesh flake zinc powder.

4. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 1, characterized in that: The glass powder includes at least one of 600 mesh, 800 mesh, 1250 mesh, 3000 mesh, and 5000 mesh glass powder.

5. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 1, characterized in that: The melting point of the glass powder is 450-500°C.

6. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 1, characterized in that: The high temperature resistant filler includes at least one of talc powder, mica powder, titanium dioxide, zirconium oxide, and silicon carbide.

7. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 1, characterized in that: The leveling agent includes at least one of BYK-306, BYK-310 and BYK-330.

8. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 5, characterized in that: The defoaming agent includes at least one of BYK-066N, BYK-077 and BYK-085.

9. The long-lasting corrosion-resistant and high-temperature-resistant coating according to claim 1, characterized in that: The thixotropic agent is R972 type fumed silica.

10. A method for preparing a long-lasting corrosion-resistant and high-temperature-resistant coating, characterized in that: For preparing the long-lasting corrosion-resistant and high-temperature-resistant coating according to any one of claims 1 to 9, the preparation method comprises the following steps: The epoxy POSS modified silicone resin and the high temperature resistant filler are uniformly mixed according to a ratio to form a first dispersion; Adding glass powder, zinc powder, leveling agent and thixotropic agent to the first dispersion in order according to the ratio, and mixing them evenly to form a second dispersion; ball-milling the second dispersion and sieving it through a sieve to obtain a third dispersion; The defoamer is added to the third dispersion according to the ratio, dispersed evenly, and a long-lasting corrosion-resistant and high-temperature-resistant coating is obtained.

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