High temperature resistant silicone powder coating

Abstract

The present invention discloses a high temperature resistant organosilicon powder coating, which is made of the following ingredients: organosilicon resin, composite modified powder, polybutylene diamine adipamide, phenolic resin, curing agent, antioxidant, leveling agent, light stabilizer; wherein, the weight ratio of the composite modified powder to the organosilicon resin is 1:3; the high temperature resistant organosilicon powder coating of the present invention significantly improves the high temperature resistance of the coating through the synergistic effect of each component, and takes the organosilicon resin as the main component, and with its own excellent high temperature resistance, it lays a high temperature resistance foundation for the coating. The present invention plays a key role in improving the high temperature resistance of the coating by introducing a specially prepared composite modified powder, and the introduced hexagonal boron nitride has high thermal conductivity and chemical stability, can quickly conduct heat, and avoid local overheating; graphene oxide has excellent mechanical properties and barrier properties.

Description

Technical Field

[0001] The invention belongs to the technical field of powder coatings, in particular to high temperature resistant organic silicon powder coatings. Background Art

[0002] Powder coating is a new type of solvent-free 100% solid powder coating. With the continuous advancement of technology, the variety of powder coatings is becoming more and more abundant, and the application areas are also expanding. Nowadays, powder coatings have been widely used around the world and have become one of the fastest growing areas in the coatings industry.

[0003] Powder coatings have the following advantages: Good environmental performance: Powder coatings do not contain organic solvents and have no volatile organic compound (VOC) emissions, making them more friendly to the environment and human health.

[0004] High utilization rate: Powder coating can be applied by electrostatic spraying and other methods, and the utilization rate of coating is as high as over 90%, which reduces the waste of coating.

[0005] Excellent coating performance: Powder coating has good corrosion resistance, wear resistance, weather resistance and decorative properties, and can meet the needs of different fields.

[0006] Easy construction: The construction process of powder coating is simple, which can realize automated production and improve production efficiency.

[0007] Conventional powder coatings may change color, lose gloss, powderize or even fall off in high temperature environments. Their use temperature is usually limited to below 150°C. In addition, high temperature resistant powders will age faster due to acid and alkali corrosion when used in high temperature environments for a long time. Therefore, in order to further improve the performance of powder coatings, the present invention provides an organosilicon powder coating to improve the high temperature resistance and corrosion resistance of powder coatings. Summary of the invention

[0008] The purpose of the present invention is to provide a high temperature resistant organic silicon powder coating to solve the deficiencies in the prior art.

[0009] The technical solution adopted by the present invention is as follows:

[0010] The high temperature resistant organic silicon powder coating is made of the following ingredients by weight: organic silicon resin 45-54 parts, composite modified powder 15-18 parts, polybutylene diamine adipamide 3-5 parts, phenolic resin 35-38 parts, curing agent 4-6 parts, antioxidant 1-1.5 parts, leveling agent 2-3 parts, light stabilizer 1-2 parts;

[0011] The weight ratio of the composite modified powder to the silicone resin is 1:3.

[0012] As a further technical solution: the preparation method of the composite modified powder is:

[0013] First, sodium hydroxide is added to water, and the mixture is stirred and mixed at room temperature to obtain a sodium hydroxide solution;

[0014] The concentration of the sodium hydroxide solution is 3 mol / L;

[0015] Add hexagonal boron nitride and graphene oxide to a mixer in sequence and stir and mix for 40 minutes to obtain a mixed powder;

[0016] The mass ratio of hexagonal boron nitride to graphene oxide is 5:1-2;

[0017] The obtained mixed powder is added to a sodium hydroxide solution, the temperature is adjusted to 70°C, the mixture is stirred for 35 hours, and then filtered, washed with water until neutral, and then the washed mixed powder is placed in a drying oven, the temperature in the drying oven is adjusted to 100°C, and then the mixed powder is dried at a constant temperature for 12 hours, and then the mixed powder is discharged and cooled to room temperature to obtain a pretreated mixed powder;

[0018] Adding the coupling agent to the ethanol solution, and stirring until the coupling agent is completely dissolved, to obtain a coupling agent solution;

[0019] The pretreated mixed powder prepared above was added to the coupling agent solution, the temperature was adjusted to 58°C, the mixture was stirred in a water bath for 4 hours, filtered, washed with water, placed in a drying oven, the temperature in the drying oven was adjusted to 80°C, and then dried for 10 hours, discharged, and cooled to obtain a composite modified powder;

[0020] Wherein, water washing is to soak and wash with clean water for 10 minutes;

[0021] Among them, the water immersion temperature is 30℃;

[0022] The graphene oxide preparation method is:

[0023] Graphene and sulfuric acid solution were mixed in a mass ratio of 1:10, the temperature was adjusted to 70°C, the mixture was stirred for 4 hours, and then filtered, washed with water until neutral, and dried in a drying oven at 60°C for 8 hours.

[0024] Among them, the mass fraction of sulfuric acid solution is 75%.

[0025] As a further technical solution: the stirring speed of the stirring is 550r / min.

[0026] As a further technical solution: the mixing ratio of the mixed powder and the sodium hydroxide solution is 20-25g:150mL.

[0027] As a further technical solution: the coupling agent is an organic silane coupling agent;

[0028] The organosilane coupling agent is vinyltrimethoxysilane;

[0029] The mass fraction of the ethanol solution is 95%;

[0030] The mixing mass ratio of the coupling agent and the ethanol solution is 1:10.

[0031] As a further technical solution: the curing agent is triglycidyl isocyanurate.

[0032] As a further technical solution: the antioxidant is a mixture of antioxidant 1010 and antioxidant 168;

[0033] The mixing mass ratio of the antioxidant 1010 to the antioxidant 168 is 4:1.

[0034] As a further technical solution: the leveling agent is an acrylic leveling agent;

[0035] The acrylic leveling agent is BYK-301.

[0036] As a further technical solution: the light stabilizer is a hindered amine light stabilizer.

[0037] As a further technical solution: the hindered amine light stabilizer is di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0038] Beneficial effects:

[0039] The high temperature resistant silicone powder coating of the present invention significantly improves the high temperature resistance of the coating through the synergistic effect of various components, and uses silicone resin as the main component, which lays a high temperature resistance foundation for the coating by virtue of its own excellent high temperature resistance.

[0040] The present invention plays a key role in improving the high temperature resistance of the coating by introducing a special composite modified powder. The introduced hexagonal boron nitride has high thermal conductivity and chemical stability, can quickly conduct heat and avoid local overheating; graphene oxide has excellent mechanical properties and barrier properties. The composite modified powder prepared by the present invention can be closely combined with the silicone resin to form a stable network structure. On the one hand, this network structure enhances the thermal conductivity efficiency inside the coating, enables heat to be evenly dispersed, and avoids local high temperature accumulation leading to a decrease in coating performance; on the other hand, the high stability and barrier properties of the composite modified powder itself can effectively block the direct erosion of heat on the silicone resin in a high temperature environment, delay the thermal decomposition of the resin, and thus significantly improve the overall high temperature resistance of the coating.

[0041] Phenolic resin, with its good thermal stability and adhesion, is combined with silicone resin to further improve the high temperature resistance and bonding strength of the coating; triglycidyl isocyanurate is used as a curing agent, which enables the coating to form a dense cross-linked structure during curing, enhancing its high temperature resistance and chemical corrosion resistance.

[0042] The organosilicon powder coating prepared by the present invention also has good corrosion resistance. Through the optimization and creative improvement of the existing components and dosages of the present invention, the prepared organosilicon powder coating can form a dense protective film on the surface of the coated object, which can effectively block the intrusion of corrosive media such as moisture, oxygen, and salt spray, thereby greatly improving the corrosion resistance of the coating.

[0043] The organic silicon powder coating prepared by the present invention has low surface energy, making it difficult for pollutants to adhere to the surface thereof. Even if pollutants such as dust are present on the surface, they can be easily washed away by rainwater, thereby keeping the coating surface clean and reducing maintenance costs.

[0044] The present invention uses the cooperation of organic silicone resin and phenolic resin to enable the prepared organic silicone powder coating to form a coating with a certain elasticity on the surface of the coated object. It can not only adapt to the deformation of the coated object, but also provide good adhesion, ensuring that the coating will not crack, fall off, etc. during long-term use, thereby greatly improving the service life of the coating.

[0045] The composite modified powder of the present invention can enhance the performance of the organosilicon powder coating. Since the composite modified powder has an extremely small particle size and a large specific surface area, it can be uniformly dispersed in the matrix of the organosilicon powder coating. On the one hand, the composite modified powder can be filled into the microscopic pores and defects of the coating, making the coating structure more compact, reducing the penetration channels of media such as gas and liquid, and improving the barrier properties of the coating, thereby enhancing the corrosion resistance and weather resistance of the coating. On the other hand, as a rigid particle, the composite modified powder can limit the movement of the polymer chain segment and improve the hardness and wear resistance of the coating.

[0046] In addition, the surface of the composite modified powder has high activity and can react physically or chemically with the silicone resin molecular chain to form a strong interface bond. This interfacial interaction can effectively transfer stress. When the coating is subjected to external force, the composite modified powder can bear part of the stress and prevent the expansion of cracks, thereby improving the toughness and impact resistance of the coating. At the same time, good interfacial bonding can also improve the dispersion stability of the composite modified powder in the silicone matrix, avoid the agglomeration of fillers, give full play to the reinforcing effect of the composite modified powder, and greatly improve the stability of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a bar graph of the impact resistance of each test group. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0049] The following are specific embodiments

[0050] Example 1

[0051] The high temperature resistant organic silicon powder coating is made of the following ingredients by weight: organic silicon resin 45 parts, composite modified powder 15 parts, polybutylene diamine adipamide 3 parts, phenolic resin 35 parts, curing agent is triglycidyl isocyanurate 4 parts, antioxidant 1 part, leveling agent is acrylate leveling agent 2 parts, light stabilizer is hindered amine light stabilizer 1 part;

[0052] The antioxidant is a mixture of antioxidant 1010 and antioxidant 168;

[0053] The mixing mass ratio of the antioxidant 1010 to the antioxidant 168 is 4:1.

[0054] The acrylic leveling agent is BYK-301.

[0055] The hindered amine light stabilizer is di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0056] The preparation method of the composite modified powder is as follows:

[0057] First, sodium hydroxide is added to water, and the mixture is stirred and mixed at room temperature to obtain a sodium hydroxide solution;

[0058] The concentration of the sodium hydroxide solution is 3 mol / L;

[0059] Add hexagonal boron nitride and graphene oxide to a mixer in sequence and stir and mix for 40 minutes to obtain a mixed powder;

[0060] The mixing mass ratio of hexagonal boron nitride and graphene oxide is 5:1;

[0061] The obtained mixed powder is added to the sodium hydroxide solution prepared above, the temperature is adjusted to 70°C, the mixture is stirred for 35 hours, and then filtered, washed with water until neutral, and then the washed mixed powder is placed in a drying oven, the temperature in the drying oven is adjusted to 100°C, and then the mixture is dried at a constant temperature for 12 hours, and then the mixture is discharged and cooled to room temperature to obtain a pretreated mixed powder; the mixing ratio of the mixed powder and the sodium hydroxide solution is 20g:150mL;

[0062] The coupling agent is added to the ethanol solution, and then stirred until the coupling agent is completely dissolved to obtain a coupling agent solution.

[0063] The coupling agent is an organic silane coupling agent;

[0064] The organosilane coupling agent is vinyltrimethoxysilane;

[0065] The mass fraction of the ethanol solution is 95%;

[0066] The mixing mass ratio of the coupling agent and the ethanol solution is 1:10.

[0067] The pretreated mixed powder prepared above was added to the coupling agent solution, the temperature was adjusted to 58°C, the mixture was stirred in a water bath for 4 hours, and then filtered, washed with water, placed in a drying oven, the temperature in the drying oven was adjusted to 80°C, and then dried for 10 hours, discharged, and cooled to obtain a composite modified powder;

[0068] Wherein, water washing is to soak and wash with clean water for 10 minutes;

[0069] Among them, the water immersion temperature is 30℃;

[0070] The graphene oxide preparation method is:

[0071] Graphene and sulfuric acid solution were mixed in a mass ratio of 1:10, the temperature was adjusted to 70°C, the mixture was stirred for 4 hours, and then filtered, washed with water until neutral, and dried in a drying oven at 60°C for 8 hours.

[0072] Among them, the mass fraction of sulfuric acid solution is 75%.

[0073] The stirring speed was 550 r / min.

[0074] Example 2

[0075] The high temperature resistant organic silicon powder coating comprises the following ingredients by weight: organic silicon resin 48 parts, composite modified powder 16 parts, polybutylene diamine adipamide 3.5 parts, phenolic resin 36 parts, curing agent is triglycidyl isocyanurate 5 parts, antioxidant 1.2 parts, leveling agent is acrylate leveling agent 2.5 parts, light stabilizer is hindered amine light stabilizer 1.2 parts; antioxidant is a mixture of antioxidant 1010 and antioxidant 168;

[0076] The mixing mass ratio of the antioxidant 1010 to the antioxidant 168 is 4:1.

[0077] The acrylic leveling agent is BYK-301.

[0078] The hindered amine light stabilizer is di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0079] The weight ratio of the composite modified powder to the silicone resin is 1:3.

[0080] The preparation method of the composite modified powder is as follows:

[0081] First, sodium hydroxide is added to water, and the mixture is stirred and mixed at room temperature to obtain a sodium hydroxide solution;

[0082] The concentration of the sodium hydroxide solution is 3 mol / L;

[0083] Add hexagonal boron nitride and graphene oxide to a mixer in sequence and stir and mix for 40 minutes to obtain a mixed powder;

[0084] The mixing mass ratio of hexagonal boron nitride and graphene oxide is 5:1.5;

[0085] The obtained mixed powder is added to the sodium hydroxide solution prepared above, the temperature is adjusted to 70°C, the mixture is stirred for 35 hours, and then filtered, washed with water until neutral, and then the washed mixed powder is placed in a drying oven, the temperature in the drying oven is adjusted to 100°C, and then the mixture is dried at a constant temperature for 12 hours, and then the mixture is discharged and cooled to room temperature to obtain a pretreated mixed powder; the mixing ratio of the mixed powder and the sodium hydroxide solution is 22g:150mL;

[0086] The coupling agent is added to the ethanol solution, and then stirred until the coupling agent is completely dissolved to obtain a coupling agent solution.

[0087] The coupling agent is an organic silane coupling agent;

[0088] The organosilane coupling agent is vinyltrimethoxysilane;

[0089] The mass fraction of the ethanol solution is 95%;

[0090] The mixing mass ratio of the coupling agent and the ethanol solution is 1:10.

[0091] The pretreated mixed powder prepared above was added to the coupling agent solution, the temperature was adjusted to 58°C, the mixture was stirred in a water bath for 4 hours, and then filtered, washed with water, placed in a drying oven, the temperature in the drying oven was adjusted to 80°C, and then dried for 10 hours, discharged, and cooled to obtain a composite modified powder;

[0092] Wherein, water washing is to soak and wash with clean water for 10 minutes;

[0093] Among them, the water immersion temperature is 30℃;

[0094] The graphene oxide preparation method is:

[0095] Graphene and sulfuric acid solution were mixed in a mass ratio of 1:10, the temperature was adjusted to 70°C, the mixture was stirred for 4 hours, and then filtered, washed with water until neutral, and dried in a drying oven at 60°C for 8 hours.

[0096] Among them, the mass fraction of sulfuric acid solution is 75%.

[0097] The stirring speed was 550 r / min.

[0098] Example 3

[0099] The high temperature resistant organic silicon powder coating comprises the following ingredients by weight: 51 parts of organic silicon resin, 17 parts of composite modified powder, 4 parts of polybutylene diamine adipamide, 36 parts of phenolic resin, 5 parts of triglycidyl isocyanurate as curing agent, 1.4 parts of antioxidant, 3 parts of acrylate leveling agent as leveling agent, 1.5 parts of hindered amine light stabilizer as light stabilizer; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168;

[0100] The mixing mass ratio of the antioxidant 1010 to the antioxidant 168 is 4:1.

[0101] The acrylic leveling agent is BYK-301.

[0102] The hindered amine light stabilizer is di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0103] The preparation method of the composite modified powder is as follows:

[0104] First, sodium hydroxide is added to water, and the mixture is stirred and mixed at room temperature to obtain a sodium hydroxide solution;

[0105] The concentration of the sodium hydroxide solution is 3 mol / L;

[0106] Add hexagonal boron nitride and graphene oxide to a mixer in sequence and stir and mix for 40 minutes to obtain a mixed powder;

[0107] The mixing mass ratio of hexagonal boron nitride and graphene oxide is 5:1.5;

[0108] The obtained mixed powder is added to the sodium hydroxide solution prepared above, the temperature is adjusted to 70°C, the mixture is stirred for 35 hours, and then filtered, washed with water until neutral, and then the washed mixed powder is placed in a drying oven, the temperature in the drying oven is adjusted to 100°C, and then the mixture is dried at a constant temperature for 12 hours, and then the mixture is discharged and cooled to room temperature to obtain a pretreated mixed powder; the mixing ratio of the mixed powder and the sodium hydroxide solution is 23g:150mL;

[0109] The coupling agent is added to the ethanol solution, and then stirred until the coupling agent is completely dissolved to obtain a coupling agent solution.

[0110] The coupling agent is an organic silane coupling agent;

[0111] The organosilane coupling agent is vinyltrimethoxysilane;

[0112] The mass fraction of the ethanol solution is 95%;

[0113] The mixing mass ratio of the coupling agent and the ethanol solution is 1:10.

[0114] The pretreated mixed powder prepared above was added to the coupling agent solution, the temperature was adjusted to 58°C, the mixture was stirred in a water bath for 4 hours, and then filtered, washed with water, placed in a drying oven, the temperature in the drying oven was adjusted to 80°C, and then dried for 10 hours, discharged, and cooled to obtain a composite modified powder;

[0115] Wherein, water washing is to soak and wash with clean water for 10 minutes;

[0116] Among them, the water immersion temperature is 30℃;

[0117] The graphene oxide preparation method is:

[0118] Graphene and sulfuric acid solution were mixed in a mass ratio of 1:10, the temperature was adjusted to 70°C, the mixture was stirred for 4 hours, and then filtered, washed with water until neutral, and dried in a drying oven at 60°C for 8 hours.

[0119] Among them, the mass fraction of sulfuric acid solution is 75%.

[0120] The stirring speed was 550 r / min.

[0121] Example 4

[0122] The high temperature resistant organic silicon powder coating comprises the following ingredients by weight: 54 parts of organic silicon resin, 18 parts of composite modified powder, 5 parts of polybutylene diamine adipamide, 38 parts of phenolic resin, 6 parts of triglycidyl isocyanurate as curing agent, 1.5 parts of antioxidant, 3 parts of acrylate leveling agent as leveling agent, 2 parts of hindered amine light stabilizer as light stabilizer; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168;

[0123] The mixing mass ratio of the antioxidant 1010 to the antioxidant 168 is 4:1.

[0124] The acrylic leveling agent is BYK-301.

[0125] The hindered amine light stabilizer is di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0126] The weight ratio of the composite modified powder to the silicone resin is 1:3.

[0127] The preparation method of the composite modified powder is as follows:

[0128] First, sodium hydroxide is added to water, and the mixture is stirred and mixed at room temperature to obtain a sodium hydroxide solution;

[0129] The concentration of the sodium hydroxide solution is 3 mol / L;

[0130] Add hexagonal boron nitride and graphene oxide to a mixer in sequence and stir and mix for 40 minutes to obtain a mixed powder;

[0131] The mixing mass ratio of hexagonal boron nitride and graphene oxide is 5:2;

[0132] The obtained mixed powder is added to the sodium hydroxide solution prepared above, the temperature is adjusted to 70°C, the mixture is stirred for 35 hours, and then filtered, washed with water until neutral, and then the washed mixed powder is placed in a drying oven, the temperature in the drying oven is adjusted to 100°C, and then the mixture is dried at a constant temperature for 12 hours, and then the mixture is discharged and cooled to room temperature to obtain a pretreated mixed powder; the mixing ratio of the mixed powder and the sodium hydroxide solution is 25g:150mL;

[0133] The coupling agent is added to the ethanol solution, and then stirred until the coupling agent is completely dissolved to obtain a coupling agent solution.

[0134] The coupling agent is an organic silane coupling agent;

[0135] The organosilane coupling agent is vinyltrimethoxysilane;

[0136] The mass fraction of the ethanol solution is 95%;

[0137] The mixing mass ratio of the coupling agent and the ethanol solution is 1:10.

[0138] The pretreated mixed powder prepared above was added to the coupling agent solution, the temperature was adjusted to 58°C, the mixture was stirred in a water bath for 4 hours, and then filtered, washed with water, placed in a drying oven, the temperature in the drying oven was adjusted to 80°C, and then dried for 10 hours, discharged, and cooled to obtain a composite modified powder;

[0139] Wherein, water washing is to soak and wash with clean water for 10 minutes;

[0140] Among them, the water immersion temperature is 30℃;

[0141] The graphene oxide preparation method is:

[0142] Graphene and sulfuric acid solution were mixed in a mass ratio of 1:10, the temperature was adjusted to 70°C, the mixture was stirred for 4 hours, and then filtered, washed with water until neutral, and dried in a drying oven at 60°C for 8 hours.

[0143] Among them, the mass fraction of sulfuric acid solution is 75%.

[0144] The stirring speed was 550 r / min.

[0145] Comparative Example 1:

[0146] Based on the technical solution of Example 1, the difference from the technical solution of Example 1 is that no composite modified powder is added.

[0147] Comparative Example 2:

[0148] Based on the technical solution of Example 1, the difference from the technical solution of Example 1 is that the composite modified powder is replaced by an equal amount of graphene.

[0149] test:

[0150] Performance test: under the same conditions, the samples of the embodiment and the comparative example were sprayed onto a steel plate, baked at 150°C for 30 min, with a coating thickness of 50 μm ± 1 μm, and the performance was tested;

[0151] High temperature resistance test:

[0152] Refer to: GB / T 16592-1996 "Determination of mass loss of powder coatings during baking";

[0153] The test temperature is 230℃ and the test time is 2h;

[0154] Table 1

[0155]

[0156] It can be seen from Table 1 that the powder coating of the present invention has excellent high temperature resistance.

[0157] High temperature corrosion resistance test (150h) is carried out in accordance with GB / T 1771 "Determination of neutral salt spray resistance of paints and varnishes", 5% neutral salt spray, and the test temperature is 200°C:

[0158] Table 2

[0159]

[0160] It can be seen from Table 2 that the powder coating prepared by the present invention has excellent high temperature corrosion resistance.

[0161] Impact resistance test: Refer to GB / T1732-1993 test:

[0162] Table 3

[0163]

[0164] It can be seen from Table 3 that the coating formed by the powder coating prepared in the present invention has higher impact resistance.

[0165] Ultraviolet accelerated aging test, refer to GB / T23987-2009;

[0166] Table 4

[0167]

[0168] It can be seen from Table 4 that the organosilicon powder coating prepared in the present invention has excellent resistance to ultraviolet discoloration.

[0169] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification, should be within the protection scope of the present invention.

Claims

1. High temperature resistant silicone powder coating, characterized in that: The following ingredients are included by weight: 45-54 parts of silicone resin, 15-18 parts of composite modified powder, 3-5 parts of polybutylene adipamide, 35-38 parts of phenolic resin, 4-6 parts of curing agent, 1-1.5 parts of antioxidant, 2-3 parts of leveling agent, and 1-2 parts of light stabilizer; The weight ratio of the composite modified powder to the silicone resin is 1:

3.

2. The high temperature resistant silicone powder coating according to claim 1, characterized in that: The composite modified powder preparation method is: First, sodium hydroxide is added to water, and the mixture is stirred and mixed at room temperature to obtain a sodium hydroxide solution; The concentration of the sodium hydroxide solution is 3 mol / L; Add hexagonal boron nitride and graphene oxide to a mixer in sequence and stir and mix for 40 minutes to obtain a mixed powder; The mass ratio of hexagonal boron nitride to graphene oxide is 5:1-2; The obtained mixed powder is added to a sodium hydroxide solution, the temperature is adjusted to 70°C, the mixture is stirred for 35 hours, and then filtered, washed with water until neutral, and then the washed mixed powder is placed in a drying oven, the temperature in the drying oven is adjusted to 100°C, and then the mixed powder is dried at a constant temperature for 12 hours, and then the mixed powder is discharged and cooled to room temperature to obtain a pretreated mixed powder; Adding the coupling agent to the ethanol solution, and stirring until the coupling agent is completely dissolved, to obtain a coupling agent solution; The pretreated mixed powder prepared above was added to the coupling agent solution, the temperature was adjusted to 58°C, the mixture was stirred in a water bath for 4 hours, filtered, washed with water, placed in a drying oven, the temperature in the drying oven was adjusted to 80°C, and then dried for 10 hours, discharged, and cooled to obtain a composite modified powder; Wherein, water washing is to soak and wash with clean water for 10 minutes; Among them, the water immersion temperature is 30℃; The graphene oxide preparation method is: Graphene and sulfuric acid solution were mixed in a mass ratio of 1:10, the temperature was adjusted to 70°C, the mixture was stirred for 4 hours, and then filtered, washed with water until neutral, and dried in a drying oven at 60°C for 8 hours. Among them, the mass fraction of sulfuric acid solution is 75%.

3. The high temperature resistant silicone powder coating according to claim 2, characterized in that: The stirring speed of the stirring is 550 r / min.

4. The high temperature resistant silicone powder coating according to claim 2, characterized in that: The mixing ratio of the mixed powder and the sodium hydroxide solution is 20-25g:150mL.

5. The high temperature resistant silicone powder coating according to claim 2, characterized in that: The coupling agent is an organic silane coupling agent; The organosilane coupling agent is vinyltrimethoxysilane; The mass fraction of the ethanol solution is 95%; The mixing mass ratio of the coupling agent and the ethanol solution is 1:

10.

6. The high temperature resistant silicone powder coating according to claim 1, characterized in that: The curing agent is triglycidyl isocyanurate.

7. The high temperature resistant silicone powder coating according to claim 1, characterized in that: The antioxidant is a mixture of antioxidant 1010 and antioxidant 168; The mixing mass ratio of the antioxidant 1010 to the antioxidant 168 is 4:

1.

8. The high temperature resistant silicone powder coating according to claim 1, characterized in that: The leveling agent is an acrylic leveling agent; The acrylic leveling agent is BYK-301.

9. The high temperature resistant silicone powder coating according to claim 1, characterized in that: The light stabilizer is a hindered amine light stabilizer.

10. The high temperature resistant silicone powder coating according to claim 9, characterized in that: The hindered amine light stabilizer is di(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

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