High-temperature-resistant coating composition and application thereof, high-temperature-resistant thin coating and high-temperature-resistant thick coating

Abstract

The invention relates to a high-temperature-resistant coating composition and application thereof, a high-temperature-resistant thin coating and a high-temperature-resistant thick coating, and relates to the technical field of coatings, the high-temperature-resistant coating composition comprises a resin base material and a filler, the resin base material comprises POSS resin, and the filler comprises at least one of titanium dioxide and matt powder. The POSS resin, the titanium dioxide and the matt powder are used for improving the high-temperature adhesive force, the hardness, the weather resistance, the corrosion resistance, the wear resistance and the like of a coating, then two high-temperature-resistant coatings are developed and used for protecting and decorating the surfaces of plastics, woods, adhesive tapes and the like, the adhesive force at the high temperature of 180 DEG C can reach 80-85% of the adhesive force at the room temperature, and the temperature resistance is good; wherein the thin coating is used for base coating, the thick coating is used for surface coating, and the temperature resistance can reach 180 DEG C; the thick coating has matte performance, and can solve the problems of low high-temperature adhesive force of a common coating and no high-temperature resistance of a matte coating under a high-temperature condition at present.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a high temperature resistant coating composition and application thereof, a high temperature resistant thin coating and a high temperature resistant thick coating. Background Art

[0002] In the field of electronic product manufacturing, high-performance composite materials such as thermal conductive, conductive, electromagnetic shielding and flame retardant tapes play a vital role. These composite materials often use flexible films such as PET (polyethylene terephthalate), PI (polyimide), PP (polypropylene), PVC (polyvinyl chloride) as the base or protective layer. However, due to their inherent surface softness, insufficient scratch resistance and easy ink loss during printing, these materials are prone to surface scratches and gloss loss during processing or terminal application, affecting the aesthetics and durability of the product.

[0003] Similarly, in office furniture, water cups, household appliances and other products made of wood, plastic or metal materials, if their surfaces are directly exposed to the environment, they will inevitably suffer from scratches, corrosion and other damages after long-term use. To meet these challenges, the industry generally adopts a strategy of applying a protective coating on the surface of the material. The ideal coating must have excellent scratch resistance, strong adhesion, excellent corrosion resistance and a soft matte effect to ensure that the product can maintain good appearance and performance in various environments.

[0004] However, the coating technology currently on the market still faces a major challenge: how to ensure the matte effect and strong adhesion of the coating while maintaining its stability in high temperature environments. Specifically, many coatings will show a weakened adhesion phenomenon under high temperature conditions, and attempts to increase the gloss by adding inorganic fillers such as matte powder will often further weaken the adhesion of the coating, resulting in a decrease in coating performance.

[0005] In view of this, the present invention aims to provide an innovative high temperature resistant coating composition and an application method thereof, including two forms of high temperature resistant thin coating and high temperature resistant thick coating, aiming to simultaneously solve the problem in the prior art that matte effect, strong adhesion and high temperature resistance are difficult to take into account at the same time, and provide an efficient and comprehensive solution for the surface protection of composite materials of electronic products and a variety of daily necessities. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a high temperature resistant coating composition and application thereof, a high temperature resistant thin coating and a high temperature resistant thick coating.

[0007] In a first aspect, the present invention provides a high temperature resistant coating composition, which comprises a resin base material and a filler, wherein the resin base material comprises a POSS resin, and the filler comprises at least one of titanium dioxide and matte powder.

[0008] Furthermore, the high temperature resistant coating composition also includes an auxiliary agent, and the auxiliary agent includes at least one of an adhesion promoter, a silane coupling agent, a curing agent and a leveling agent.

[0009] In a second aspect, the present invention provides a use of the high temperature resistant coating composition described in any one of the first aspects in the preparation of a high temperature resistant coating and / or a high temperature resistant coating.

[0010] In a third aspect, the present invention provides a high temperature resistant thin coating, which comprises the following components in parts by weight:

[0011] 40-45 parts of polyurethane resin, 40-45 parts of polyester resin, 2-4 parts of first curing agent, 2-6 parts of POSS resin, 4-8 parts of titanium dioxide, 2-4 parts of adhesion promoter and a first solvent accounting for 80% of the total weight of the polyurethane resin, the polyester resin, the first curing agent, the POSS resin, the titanium dioxide and the adhesion promoter.

[0012] Furthermore, the first curing agent is an isocyanate curing agent, the adhesion promoter is a phosphate adhesion promoter, and the first solvent includes at least one of butanone and ethyl acetate.

[0013] The preparation method of the high temperature resistant thin coating comprises the following steps:

[0014] Dissolving a polyurethane resin in a portion of a first solvent, and then adding a polyester resin and an adhesion promoter, stirring and mixing, to obtain a first mixed resin;

[0015] Dissolving titanium dioxide and POSS resin in the remaining first solvent, and then mixing and grinding to obtain solution 1;

[0016] The first mixed resin, the solution 1 and the first curing agent are stirred and mixed to obtain a solution 2;

[0017] The viscosity of the solution 2 is adjusted to 80-100 Mpa·s, and then filtered to obtain a solution 3;

[0018] The solution 3 is subjected to vacuum degassing to obtain the high temperature resistant thin coating.

[0019] In a fourth aspect, the present invention provides a high temperature resistant thick coating, which comprises the following components in parts by weight:

[0020] 30-40 parts of epoxy resin, 30-40 parts of polyester resin, 1-3 parts of second curing agent, 2-5 parts of POSS resin, 3-6 parts of silane coupling agent, 1-2 parts of leveling agent, 10-20 parts of matte powder, 3-6 parts of titanium dioxide and a second solvent accounting for 100% of the total weight of the epoxy resin, the polyester resin, the second curing agent, the POSS resin, the silane coupling agent, the leveling agent, the matte powder and the titanium dioxide.

[0021] Furthermore, the second curing agent includes an epoxy curing agent, and the second solvent includes at least one of butanone and ethyl acetate.

[0022] Furthermore, the preparation method of the high temperature resistant thick coating comprises the following steps:

[0023] dissolving the epoxy resin in a portion of the second solvent, and then adding the polyester resin and the silane coupling agent, stirring and mixing, to obtain a second mixed resin;

[0024] Dissolving matte powder, titanium dioxide and POSS resin in the remaining second solvent, and then mixing and grinding to obtain solution 4;

[0025] The second mixed resin, the solution 4, the second curing agent and the leveling agent are stirred and mixed to obtain a solution 5;

[0026] The viscosity of the solution 5 is adjusted to 150 Mpa·s, and then filtered to obtain a solution 6;

[0027] The solution 6 is subjected to vacuum degassing to obtain the high temperature resistant thick coating.

[0028] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0029] The embodiment of the present invention provides a high temperature resistant coating composition and application thereof, a high temperature resistant thin coating and a high temperature resistant thick coating. The high temperature adhesion, hardness, weather resistance, corrosion resistance, wear resistance and the like of the coating are improved by using POSS resin, titanium dioxide and matte powder, and then two high temperature resistant coatings are developed for the protection and decoration functions of the surfaces of plastics, wood, tapes and the like. The adhesion under high temperature conditions of 180°C can reach 80-85% of that under room temperature conditions, and the heat resistance is good; wherein the thin coating is used for primer and the thick coating is used for surface coating, and the heat resistance can reach 180°C; the thick coating has matte properties, which can solve the problems of low high temperature adhesion of ordinary coatings under current high temperature conditions and the inability of matte coatings to withstand high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 A schematic flow chart of a method for preparing a high temperature resistant thin coating provided in an embodiment of the present invention.

[0033] Figure 2 A schematic flow chart of a method for preparing a high temperature resistant thick coating provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0036] In a first aspect, the present invention provides a high temperature resistant coating composition, which comprises a resin base material and a filler, wherein the resin base material comprises a POSS resin, and the filler comprises at least one of titanium dioxide and matte powder.

[0037] The invention improves the high-temperature adhesion, hardness, weather resistance, corrosion resistance, wear resistance and the like of the coating by using POSS resin, titanium dioxide and matte powder, and further develops two high-temperature resistant coatings for the protection and decoration functions of the surfaces of plastics, wood, tapes and the like. The adhesion under a high temperature condition of 180 DEG C can reach 80-85% of that under room temperature, and the heat resistance is good. The thin coating is used for primer, and the thick coating is used for surface coating, and the heat resistance can reach 180 DEG C. The thick coating has matte performance, and can solve the problems of low high-temperature adhesion of ordinary coatings under current high temperature conditions and the inability of matte coatings to withstand high temperatures.

[0038] In some specific embodiments, the high temperature resistant coating composition further comprises an auxiliary agent, wherein the auxiliary agent comprises at least one of an adhesion promoter, a silane coupling agent, a curing agent and a leveling agent.

[0039] In some specific embodiments, the POSS resin is independently synthesized, and the synthesis formula and process are referred to CN 117229508A, as specifically described in Example 1.

[0040] In a second aspect, the present invention provides a use of the high temperature resistant coating composition described in any one of the first aspects in the preparation of a high temperature resistant coating and / or a high temperature resistant coating.

[0041] In a third aspect, the present invention provides a high temperature resistant thin coating, which comprises the following components in parts by weight:

[0042] 40-45 parts of polyurethane resin, 40-45 parts of polyester resin, 2-4 parts of first curing agent, 2-6 parts of POSS resin, 4-8 parts of titanium dioxide, 2-4 parts of adhesion promoter and a first solvent accounting for 80% of the total weight of the polyurethane resin, the polyester resin, the first curing agent, the POSS resin, the titanium dioxide and the adhesion promoter.

[0043] In some specific embodiments, the first curing agent is an isocyanate curing agent, the adhesion promoter is a phosphate adhesion promoter, and the first solvent includes at least one of butanone and ethyl acetate, preferably butanone and ethyl acetate in a weight ratio of 1:1.

[0044] In some specific embodiments, the POSS resin is independently synthesized, and the synthesis formula and process are referred to CN 117229508A, as specifically described in Example 1.

[0045] The preparation method of the high temperature resistant thin coating comprises the following steps:

[0046] Dissolving a polyurethane resin in a portion of a first solvent, and then adding a polyester resin and an adhesion promoter, stirring and mixing, to obtain a first mixed resin;

[0047] Dissolving titanium dioxide and POSS resin in the remaining first solvent, and then mixing and grinding to obtain solution 1;

[0048] The first mixed resin, the solution 1 and the first curing agent are stirred and mixed to obtain a solution 2;

[0049] The viscosity of the solution 2 is adjusted to 80-100 Mpa·s, and then filtered to obtain a solution 3;

[0050] The solution 3 is subjected to vacuum degassing to obtain the high temperature resistant thin coating.

[0051] In some specific embodiments, the preparation method of the high temperature resistant thin coating is as follows Figure 1 As shown, the specific steps include:

[0052] B1. First, the polyurethane was dissolved in butanone (50% by weight of the total solvent), and then the polyester resin and the phosphate adhesion promoter were added in sequence, and stirred at 500 r / min for 10 min to obtain a first mixed resin;

[0053] B2. Titanium dioxide and POSS resin were dissolved in ethyl acetate (50% by weight of the total solvent), and then the two were mixed and ground at 1000r / min for 40min to obtain solution 1, and the viscosity after grinding was about 60% before grinding;

[0054] B3. The first mixed resin, solution 1 and curing agent (ie, the first curing agent) were uniformly mixed and stirred at 500 r / min for 20 min to obtain solution 2;

[0055] B4. Adjust the viscosity of solution 2 to 80-100 Mpa·s, rotate at 60 r / min, and then filter through a 100-mesh filter to obtain solution 3. Finally, vacuum degassing is performed 3 times to obtain a high-temperature resistant thin coating.

[0056] In a fourth aspect, the present invention provides a high temperature resistant thick coating, which comprises the following components in parts by weight:

[0057] 30-40 parts of epoxy resin, 30-40 parts of polyester resin, 1-3 parts of second curing agent, 2-5 parts of POSS resin, 3-6 parts of silane coupling agent, 1-2 parts of leveling agent, 10-20 parts of matte powder, 3-6 parts of titanium dioxide and a second solvent accounting for 100% of the total weight of the epoxy resin, the polyester resin, the second curing agent, the POSS resin, the silane coupling agent, the leveling agent, the matte powder and the titanium dioxide.

[0058] In some specific embodiments, the second curing agent includes an epoxy curing agent, and the second solvent includes at least one of butanone and ethyl acetate, preferably butanone and ethyl acetate in a weight ratio of 1:1.

[0059] In some specific embodiments, the POSS resin is independently synthesized, and the synthesis formula and process are referred to CN 117229508A, as specifically described in Example 1.

[0060] In some specific embodiments, the method for preparing the high temperature resistant thick coating comprises the following steps:

[0061] dissolving the epoxy resin in a portion of the second solvent, and then adding the polyester resin and the silane coupling agent, stirring and mixing, to obtain a second mixed resin;

[0062] Dissolving matte powder, titanium dioxide and POSS resin in the remaining second solvent, and then mixing and grinding to obtain solution 4;

[0063] The second mixed resin, the solution 4, the second curing agent and the leveling agent are stirred and mixed to obtain a solution 5;

[0064] The viscosity of the solution 5 is adjusted to 150 Mpa·s, and then filtered to obtain a solution 6;

[0065] The solution 6 is subjected to vacuum degassing to obtain the high temperature resistant thick coating.

[0066] In some specific embodiments, the preparation method of the high temperature resistant thick coating is as follows Figure 2 As shown, the specific steps include:

[0067] C1. First, dissolve the epoxy resin with butanone (50% by weight of the total solvent), then add the polyester resin and the silane coupling agent in sequence, and stir at 500 r / min for 10 min to obtain a second mixed resin;

[0068] C2. The matte powder, titanium dioxide and POSS resin were dissolved in ethyl acetate (50% by weight of the total solvent), and then the two were mixed and ground at 1000 r / min for 40 min to obtain a solution 4, the viscosity of which after grinding was about 60% of that before grinding;

[0069] C3. The second mixed resin, solution 4, curing agent (ie, second curing agent) and leveling agent were uniformly mixed and stirred at 500 r / min for 20 min to obtain solution 5;

[0070] C4. Adjust the viscosity of solution 5 to 150 MPa·s, rotate at 60 r / min, and then filter through a 100-mesh filter to obtain solution 6. Finally, vacuum degassing is performed 3 times to obtain a high-temperature resistant thick coating.

[0071] It should be noted that the raw materials involved in the high-temperature resistant coating composition and its application, high-temperature resistant thin coating and high-temperature resistant thick coating provided in the embodiments of the present invention, unless otherwise specified or specified, can directly use commercially available products or make them themselves according to the process disclosed in the prior art; at the same time, the operating steps involved, unless otherwise specified or specified, can be carried out according to the process steps and condition parameters disclosed in the prior art or directly using existing equipment, and the present invention document will not repeat them one by one.

[0072] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0073] The sources and uses of the main raw materials involved in the following examples and comparative examples are shown in Table 1.

[0074] Table 1

[0075]

[0076] The high temperature resistant thin coating formulations provided in Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 2. The preparation processes of the coatings are the same. Figure 1 As shown, a series of thin coatings are obtained. Comparative Example 1 is compared with Example 1, but does not contain POSS resin, and other conditions remain unchanged; Comparative Example 2 is compared with Example 1, but does not contain titanium dioxide, and other conditions remain unchanged; Comparative Example 3 is compared with Example 1, but does not contain adhesion promoter, and other conditions remain unchanged. In addition to the raw materials in the table, the coating preparation process also contains 80% of the total mass of solvents butanone and ethyl acetate as solvents, wherein butanone is used to dissolve mixed polyurethane and polyester resin, and ethyl ester is used to dissolve mixed titanium dioxide and POSS resin.

[0077] Table 2 Formulations of high temperature resistant thin coatings of various embodiments and comparative examples (by weight)

[0078]

[0079]

[0080] The high temperature resistant thick coating formulas provided in Examples 4 to 6 and Comparative Examples 4 to 7 are shown in Table 3. The preparation processes of the coatings are the same. Figure 2 As shown, a series of thick coatings are obtained. Comparative Example 4 is compared with Example 4, excluding POSS resin, and other conditions remain unchanged; Comparative Example 5 is compared with Example 4, excluding silane coupling agent, and other conditions remain unchanged; Comparative Example 6 is compared with Example 4, excluding titanium dioxide, and other conditions remain unchanged; Comparative Example 7 is compared with Example 4, excluding matte powder, and other conditions remain unchanged. In addition to the raw materials in the table, the coating preparation process also includes 80% of the total mass of solvents butanone and ethyl acetate as solvents, wherein butanone is used to dissolve mixed polyurethane and polyester resin, and ethyl ester is used to dissolve mixed titanium dioxide and POSS resin.

[0081] Table 3 Formulations of high temperature resistant thick coatings of various embodiments and comparative examples (in parts by weight)

[0082]

[0083] Test Case

[0084] The high temperature resistant coating obtained by the above embodiment and comparative example is subjected to performance testing, and the testing method includes: the coating thickness is tested by a micrometer according to the ASTM D3652 standard, the surface hardness of the coating is tested by the pencil hardness ASTM D3363 standard, the coating adhesion is tested by the hundred grid method (0B, 1B, 2B, 3B, 4B, 5B) according to the GB / T 9286-2021 standard, the coating weatherability is tested by the ASTM G154 standard for its performance changes in the ultraviolet, high temperature and water mist laboratory test box, the corrosion resistance test of the coating is carried out by the ASTM B117 salt spray test standard, the wear resistance of the coating is carried out by the GB / T 23988-2009 standard, and the coating printing performance is verified by the coating machine proofing. The room temperature adhesion test of the coating is carried out at 25°C, and the high temperature adhesion test is carried out in a 180°C constant temperature oil bath, and the test results are shown in Tables 4 and 5.

[0085] Table 4 Performance test results of thin coatings

[0086]

[0087]

[0088] As can be seen from Table 4, the content of POSS resin and titanium dioxide will significantly improve the temperature resistance of the thin coating. The adhesion of the thin coating at 180°C can be maintained at more than 80% of that at room temperature. When the content of POSS resin and titanium dioxide is 0, the adhesion of the coating will decrease significantly at high temperature. When the resin content is high, the hardness of the coating decreases. The reduction of POSS resin and titanium dioxide content will also lead to a significant decrease in hardness. A reduction in titanium dioxide content will lead to a decrease in the weather resistance, corrosion resistance and wear resistance of the coating. Too high a titanium dioxide content will lead to a decrease in coating adhesion and bubbles during printing. A reduction in the content of adhesion promoter will lead to a decrease in coating adhesion and uneven printing.

[0089] Table 5 Performance test results of thick coating

[0090]

[0091] As can be seen from Table 5, the content of POSS resin, titanium dioxide and matte powder will significantly improve the temperature resistance of thick coatings. The adhesion of thick coatings at 180°C can be maintained at more than 85% of that at room temperature. When the content of POSS resin, titanium dioxide and matte powder is 0, the adhesion of the coating will decrease significantly at high temperature. When the resin content is high, the hardness of the coating decreases. The reduction of the content of POSS resin, titanium dioxide and matte powder will also lead to a significant decrease in hardness. The reduction of the content of titanium dioxide and matte powder will lead to a decrease in the weather resistance, corrosion resistance and wear resistance of the coating. Too high content of titanium dioxide and matte powder will lead to a decrease in the adhesion of the coating and wrinkles during printing. The reduction of the content of silane coupling agent will lead to a decrease in the adhesion of the coating.

[0092] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0093] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A high temperature resistant coating composition, characterized in that: The high temperature resistant coating composition comprises a resin base material and a filler, wherein the resin base material comprises a POSS resin, and the filler comprises at least one of titanium dioxide and matte powder.

2. The high temperature resistant coating composition according to claim 1, characterized in that: The high temperature resistant coating composition further comprises an auxiliary agent, wherein the auxiliary agent comprises at least one of an adhesion promoter, a silane coupling agent, a curing agent and a leveling agent.

3. Use of the high temperature resistant coating composition according to claim 1 or 2 in the preparation of high temperature resistant coatings and / or high temperature resistant coatings.

4. A high temperature resistant thin coating, characterized in that: The high temperature resistant thin coating comprises the following components in parts by weight: 40-45 parts of polyurethane resin, 40-45 parts of polyester resin, 2-4 parts of first curing agent, 2-6 parts of POSS resin, 4-8 parts of titanium dioxide, 2-4 parts of adhesion promoter and a first solvent accounting for 80% of the total weight of the polyurethane resin, the polyester resin, the first curing agent, the POSS resin, the titanium dioxide and the adhesion promoter.

5. The high temperature resistant thin coating according to claim 4, characterized in that: The first curing agent is an isocyanate curing agent, the adhesion promoter is a phosphate adhesion promoter, and the first solvent includes at least one of butanone and ethyl acetate.

6. The high temperature resistant thin coating according to claim 4, characterized in that: The preparation method of the high temperature resistant thin coating comprises the following steps: Dissolving a polyurethane resin in a portion of a first solvent, and then adding a polyester resin and an adhesion promoter, stirring and mixing, to obtain a first mixed resin; Dissolving titanium dioxide and POSS resin in the remaining first solvent, and then mixing and grinding to obtain solution 1; The first mixed resin, the solution 1 and the first curing agent are stirred and mixed to obtain a solution 2; The viscosity of the solution 2 is adjusted to 80-100 Mpa·s, and then filtered to obtain a solution 3; The solution 3 is subjected to vacuum degassing to obtain the high temperature resistant thin coating.

7. A high temperature resistant thick coating, characterized in that: The high temperature resistant thick coating comprises the following components in parts by weight: 30-40 parts of epoxy resin, 30-40 parts of polyester resin, 1-3 parts of second curing agent, 2-5 parts of POSS resin, 3-6 parts of silane coupling agent, 1-2 parts of leveling agent, 10-20 parts of matte powder, 3-6 parts of titanium dioxide and a second solvent accounting for 100% of the total weight of the epoxy resin, the polyester resin, the second curing agent, the POSS resin, the silane coupling agent, the leveling agent, the matte powder and the titanium dioxide.

8. The high temperature resistant thick coating according to claim 7, characterized in that: The second curing agent includes an epoxy curing agent, and the second solvent includes at least one of butanone and ethyl acetate.

9. The high temperature resistant thick coating according to claim 7, characterized in that: The preparation method of the high temperature resistant thick coating comprises the following steps: dissolving the epoxy resin in a portion of the second solvent, and then adding the polyester resin and the silane coupling agent, stirring and mixing, to obtain a second mixed resin; Dissolving matte powder, titanium dioxide and POSS resin in the remaining second solvent, and then mixing and grinding to obtain solution 4; The second mixed resin, the solution 4, the second curing agent and the leveling agent are stirred and mixed to obtain a solution 5; The viscosity of the solution 5 is adjusted to 150 Mpa·s, and then filtered to obtain a solution 6; The solution 6 is subjected to vacuum degassing to obtain the high temperature resistant thick coating.

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