High-insulation high-heat-dissipation powder coating and preparation method thereof

Abstract

The invention relates to a high-insulation and high-heat-dissipation powder coating and a preparation method thereof. The high-insulation and high-heat-dissipation powder coating comprises the following components: solid epoxy resin; fluorocarbon resin; a curing agent; oleophylic boron nitride; a pigment; benzoin; wherein the oleophylic boron nitride is a mixture of hexagonal boron nitride and spherical boron nitride which are subjected to surface modification. A paint film cured by the powder coating prepared by the invention is flat and smooth, has excellent insulating property and efficient heat dissipation property, is light in weight and excellent in flame retardant property, is suitable for the surfaces of various substrates, can be widely applied to the fields of energy storage, electronics, automobiles and the like, provides efficient heat dissipation protection and insulation safety for related equipment and structures, and can be widely applied to the fields of energy storage, electronics, automobiles and the like. The method has the effects of remarkably saving energy and improving the performance of equipment.

Description

Technical Field

[0001] The invention relates to the technical field of powder coatings, in particular to a high-insulation and high-heat dissipation powder coating and a preparation method thereof. Background Art

[0002] In today's electronic and electrical equipment field, with the rapid development of electronic technology, the operating speed and power density of equipment are constantly increasing, and the problem of heating is becoming increasingly prominent. Efficient heat dissipation and reliable insulation performance are key factors to ensure stable operation of equipment, extend service life and improve safety. Traditional heat dissipation methods such as heat sinks, fans, water cooling, etc. alone can no longer meet the requirements of equipment. There are limitations in certain specific application scenarios, such as limited space, noise problems, and insufficient reliability. At the same time, insulation protection is also crucial for electronic equipment. Insulating materials must not only be able to effectively prevent current leakage, but also maintain stable insulation performance in complex working environments. However, some materials with good insulation properties do not have ideal heat dissipation effects, cannot effectively conduct heat away in time, and are difficult to meet the heat dissipation needs of high-power equipment; although other materials have good heat dissipation performance, their insulation performance is difficult to meet high standards.

[0003] Powder coating is a new type of powder coating with 100% solid content. It has outstanding characteristics such as being solvent-free, environmentally friendly, highly efficient, recyclable, saving energy and resources, reducing labor intensity and having high mechanical strength of the coating film. It integrates insulation and heat dissipation functions into powder coating, providing an innovative solution to the heat dissipation and insulation problems of electronic equipment.

[0004] In summary, the development of a powder coating with both excellent insulation performance and efficient heat dissipation performance has important practical significance and broad market prospects. Based on this background, the present invention is committed to providing an innovative insulating heat dissipation powder coating and a preparation method thereof to meet the urgent needs of the electronic and electrical fields for high-performance heat dissipation and insulation materials. Summary of the invention

[0005] In order to solve the problem that the existing powder coatings cannot have both high insulation and high heat dissipation, the present invention provides a high insulation and high heat dissipation powder coating and a preparation method thereof.

[0006] The first object of the present invention is to provide a high-insulation and high-heat dissipation powder coating, which comprises the following components in parts by weight:

[0007] 20-30 parts of solid epoxy resin;

[0008] 5-10 parts of fluorocarbon resin;

[0009] 3-8 parts of curing agent;

[0010] 30-70 parts of oleophilic boron nitride;

[0011] Pigment 1-8 parts;

[0012] 1-4 parts of benzoin;

[0013] The oleophilic boron nitride is a mixture of hexagonal boron nitride and spherical boron nitride for surface modification, and the mass ratio of the hexagonal boron nitride to the spherical boron nitride is 1-10:20.

[0014] In some embodiments of the present invention, the particle size D50 of the hexagonal boron nitride is 20-35 um, and the particle size D50 of the spherical boron nitride is 20-80 um.

[0015] In some embodiments of the present invention, the oleophilic boron nitride is prepared by the following method:

[0016] Providing hexagonal boron nitride and spherical boron nitride, and premixing them according to a mass ratio to obtain a premix A;

[0017] The hexagonal boron nitride and spherical boron nitride premix A is subjected to high temperature annealing to obtain an active boron nitride mixture B;

[0018] The active boron nitride mixture B is first coated and modified with a silane coupling agent, and then secondly coated and modified with an organic substance to obtain the oleophilic boron nitride.

[0019] In some embodiments of the present invention, the mass ratio of hexagonal boron nitride to spherical boron nitride is 1-10:20. For example, it can be 1:10, 3:20, 1:5, 1:4, 6:20, 7:20, 2:5, 9:20, 1:2, etc., or any interval value between any two values.

[0020] In some embodiments of the present invention, the annealing treatment is performed at a temperature of 900-1300° C. and for a time of 2-5 hours.

[0021] In some embodiments of the present invention, the mass ratio of the active boron nitride mixture B to the silane coupling agent is 100:1-5;

[0022] The silane coupling agent is any one or more of triethoxyoctylsilane, aminopropyltrimethoxysilane, polydimethylsilane, propyltrimethoxysilane, bisaminosilane, vinyltrichlorosilane, vinyltrimethoxysilane, mercaptopropyltriethoxysilane, chloropropylmethyldichlorosilane, hexadecyltrimethoxysilane, and octadecyltrimethylsilane.

[0023] In some embodiments of the present invention, the organic matter is any one or more of stearic acid, zinc stearate, magnesium stearate, hydrogen-containing silicone oil, titanate, aluminate, and zirconate;

[0024] The mass ratio of the active boron nitride mixture B to the organic matter is 100:1-3.

[0025] In some embodiments of the present invention, the specific operation of the first coating modification is: adding active boron nitride mixture B and silane coupling agent into a powder modification machine, mixing and modifying at 3000-8000r / min for 5-15min, standing and reacting for 1-12h to complete the first coating modification.

[0026] In some embodiments of the present invention, the specific operation of the second coating modification is as follows: adding organic matter to the mixture that has undergone the first coating modification, mixing and coating modification at 3000-8000 r / min for 10-30 min, to achieve the second coating modification.

[0027] In some embodiments of the present invention, the curing agent is an isocyanate curing agent and / or an amine curing agent;

[0028] The pigment is a mixture of one or more of an iron oxide pigment, an ultramarine pigment or an organic pigment;

[0029] The softening temperature of the solid epoxy resin is 90-130°C.

[0030] The second object of the present invention is to provide a method for preparing the high-insulation and high-heat dissipation powder coating, comprising the following steps:

[0031] S1. The solid epoxy resin, fluorocarbon resin, curing agent, oleophilic boron nitride, pigment and benzoin are added to a high-speed mixer and mixed to obtain a premix;

[0032] S2. The premix is ​​extruded into flakes, crushed after cooling, and sieved through 160-200 meshes to obtain the high-insulation and high-heat dissipation powder coating.

[0033] When the high-insulation and high-heat dissipation powder coating of the present invention is specifically applied, the workpiece can be electrostatically sprayed or fluidized bed constructed, and then cured at high temperature and cooled.

[0034] The above technical solution of the present invention has the following advantages compared with the prior art:

[0035] The high-insulation and high-heat dissipation powder coating described in the present invention uses boron nitride with high insulation, high thermal conductivity and low density as a filler. Compared with the high-insulation and low-heat dissipation of aluminum oxide and magnesium hydroxide and the low-insulation and high-heat dissipation fillers of metal powder and carbon-based materials with single performance, the powder coating prepared by boron nitride has high insulation and good heat dissipation, which ensures the efficient, stable operation and safety of high-power equipment while making the equipment lightweight.

[0036] The high-insulation and high-heat dissipation powder coating of the present invention uses a mixture of hexagonal boron nitride and spherical boron nitride. The flakes and spheres are bridged to form more heat conduction channels, thereby greatly improving the thermal conductivity.

[0037] Due to the excellent chemical inertness of boron nitride, it is very difficult to effectively modify the surface of boron nitride. The present invention first performs high-temperature annealing treatment on the inert boron nitride to generate boron nitride nanosheets with active groups, then uses a silane coupling agent to perform chemical modification, and finally uses an organic matter to coat the boron nitride to obtain a double modification method to obtain oleophilic boron nitride, which has outstanding high filling and high compatibility in the coating system, so that the insulation and electrical breakdown resistance of the powder coating is greater than 3KV, and the heat dissipation thermal conductivity performance is above 2W / M·K, which is 5 times higher than the thermal conductivity of the existing insulation and heat dissipation coating of 0.4W / M·K; at the same time, the paint film also has good adhesion, flame retardancy and mechanical properties.

[0038] The high-insulation and high-heat dissipation coating of the present invention adopts powder coating with a solid content of 100%. Compared with oily and water-based coatings, it has outstanding advantages of being solvent-free, environmentally friendly, highly efficient, recyclable, and energy and resource saving, and is very friendly to the health of operators. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0040] Example 1

[0041] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0042] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components in parts by weight:

[0043]

[0044] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0045] (1) 10 g of hexagonal boron nitride with a particle size D50 of 20 μm and 200 g of spherical boron nitride with a particle size D50 of 30 μm were premixed to obtain a premix A, and then annealed at 900° C. for 2 hours to obtain active boron nitride B;

[0046] (2) Adding 100 g of active boron nitride B and 1 g of triethoxyoctylsilane into a powder modification machine, mixing and modifying at 3000 r / min for 5 min, standing for reaction for 1 h, and then adding 1 g of stearic acid, mixing and modifying at 4000 r / min for 15 min to obtain lipophilic boron nitride;

[0047] (3) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, oleophilic boron nitride, red iron oxide and benzoin into a high-speed mixer in proportion, mixing evenly to obtain a premix;

[0048] (4) The premix is ​​extruded into thin sheets through a 130° C. melt extruder, and then pulverized after cooling and sieved through a 160-mesh sieve to obtain a powder coating with high insulation and heat dissipation.

[0049] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 160-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0050] Example 2

[0051] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0052] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components in parts by weight:

[0053]

[0054] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0055] (1) 30 g of hexagonal boron nitride with a particle size D50 of 30 μm and 200 g of spherical boron nitride with a particle size D50 of 50 μm were premixed to obtain a premix A, and then annealed at 1000° C. for 2 hours to obtain active boron nitride B;

[0056] (2) Adding 100 g of active boron nitride B and 1 g of triethoxyoctylsilane into a powder modification machine, mixing and modifying at 4000 r / min for 10 min, standing for reaction for 2 h, and then adding 2 g of stearic acid, mixing and modifying at 8000 r / min for 15 min to obtain lipophilic boron nitride;

[0057] (3) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, oleophilic boron nitride, red iron oxide and benzoin into a high-speed mixer in proportion, mixing evenly to obtain a premix;

[0058] (4) The premix is ​​extruded into thin sheets through a 90° C. melt extruder, and then pulverized after cooling and sieved through 200 meshes to obtain a powder coating with high insulation and heat dissipation.

[0059] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 160-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0060] Example 3

[0061] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0062] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components in parts by weight:

[0063]

[0064] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0065] (1) 40 g of hexagonal boron nitride with a particle size D50 of 35 μm and 200 g of spherical boron nitride with a particle size D50 of 80 μm were premixed to obtain a premix A, and then annealed at 1000° C. for 2 hours to obtain active boron nitride B;

[0066] (2) Add 100 g of active boron nitride B and 0.5 g of vinyl trimethoxysilane into a powder modifier, mix and modify at 5000 r / min for 15 min, let it stand for 5 h, then add 1 g of stearic acid and 1 g of aluminate, mix and modify at 8000 r / min for 10 min, and obtain oleophilic boron nitride;

[0067] (3) adding solid epoxy resin, fluorocarbon resin, amine curing agent, oleophilic boron nitride, yellow iron oxide and benzoin into a high-speed mixer in proportion, mixing evenly to obtain a premix;

[0068] (4) The premix is ​​extruded into thin sheets through a 130° C. melt extruder, and then pulverized after cooling and sieved through 200 meshes to obtain a powder coating with high insulation and heat dissipation.

[0069] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 160-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0070] Example 4

[0071] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0072] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components in parts by weight:

[0073]

[0074] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0075] (1) 60 g of hexagonal boron nitride with a particle size D50 of 30 μm and 200 g of spherical boron nitride with a particle size D50 of 20 μm were premixed to obtain a premix A, and then annealed at 1200° C. for 2 hours to obtain active boron nitride B;

[0076] (2) Add 100 g of active boron nitride B, 0.5 g of triethoxyoctylsilane, and 1 g of hexadecylmethoxysilane into a powder modifier, mix and modify at 5000 r / min for 5 min, let stand for reaction for 6 h, then add 3 g of hydrogenated silicone oil, mix and modify at 5000 r / min for 25 min, and obtain oleophilic boron nitride;

[0077] (3) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, oleophilic boron nitride, ultramarine blue and benzoin into a high-speed mixer in proportion and mixing them evenly to obtain a premix;

[0078] (4) The premix is ​​extruded into thin sheets through a 120° C. melt extruder, and then pulverized after cooling and sieved through a 180-mesh sieve to obtain a powder coating with high insulation and heat dissipation.

[0079] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 150-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0080] Example 5

[0081] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0082] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components by weight:

[0083]

[0084]

[0085] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0086] (1) 60 g of hexagonal boron nitride with a particle size D50 of 30 μm and 200 g of spherical boron nitride with a particle size D50 of 80 μm were premixed to obtain a premix A, and then annealed at 1100° C. for 2 hours to obtain active boron nitride B;

[0087] (2) Add 100 g of active boron nitride B and 2 g of aminopropyltrimethoxysilane into a powder modifier, mix and modify at 8000 r / min for 15 min, let it stand for 8 h, then add 3 g of aluminate, mix and modify at 8000 r / min for 10 min to obtain oleophilic boron nitride;

[0088] (3) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, oleophilic boron nitride, Red 21 and benzoin into a high-speed mixer in proportion, mixing evenly to obtain a premix;

[0089] (4) The premix is ​​extruded into thin sheets through a 110° C. melt extruder, and then pulverized after cooling and sieved through a 160-mesh sieve to obtain a powder coating with high insulation and heat dissipation.

[0090] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 150-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0091] Example 6

[0092] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0093] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components by weight:

[0094]

[0095]

[0096] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0097] (1) 100 g of hexagonal boron nitride with a particle size D50 of 25 μm and 200 g of spherical boron nitride with a particle size D50 of 60 μm were premixed to obtain a premix A, and then annealed at 1300° C. for 2 hours to obtain active boron nitride B;

[0098] (2) Add 100 g of active boron nitride B and 1 g of octadecyltrimethylsilane into a powder modifier, mix and modify at 6000 r / min for 10 min, let it stand for reaction for 10 h, then add 2 g of aluminate and 1 g of zirconate, mix and modify at 3000 r / min for 30 min, and obtain oleophilic boron nitride;

[0099] (3) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, oleophilic boron nitride, Orange 5 and benzoin into a high-speed mixer in proportion, mixing evenly to obtain a premix;

[0100] (4) The premix is ​​extruded into thin sheets through a 120° C. melt extruder, and then pulverized after cooling and sieved through a 160-mesh sieve to obtain a powder coating with high insulation and heat dissipation.

[0101] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 150-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0102] Comparative Example 1

[0103] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0104] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components by weight:

[0105]

[0106]

[0107] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0108] (1) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, red iron oxide and benzoin into a high-speed mixer in proportion, and mixing them evenly to obtain a premix;

[0109] (2) The premix is ​​extruded into thin sheets through a 130° C. melt extruder, and then pulverized after cooling and sieved through a 160-mesh sieve to obtain a powder coating with high insulation and high heat dissipation.

[0110] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 150-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0111] Comparative Example 2

[0112] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0113] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components by weight:

[0114]

[0115] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0116] (1) Premixing 10 g of hexagonal boron nitride with a particle size D50 of 20 μm and 200 g of spherical boron nitride with a particle size D50 of 30 μm to obtain boron nitride;

[0117] (2) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, boron nitride, red iron oxide and benzoin into a high-speed mixer in proportion, mixing evenly to obtain a premix;

[0118] (3) The premix is ​​extruded into thin sheets through a 130° C. melt extruder, and then pulverized after cooling and sieved through a 160-mesh sieve to obtain a powder coating with high insulation and heat dissipation.

[0119] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 150-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0120] Comparative Example 3

[0121] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0122] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components by weight:

[0123]

[0124] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0125] (1) 100 g of hexagonal boron nitride with a particle size D50 of 20 μm was subjected to high temperature annealing at 900° C. for 2 hours to obtain active hexagonal boron nitride;

[0126] (2) Add 100 g of active hexagonal boron nitride and 1 g of triethoxyoctylsilane into a powder modification machine, mix and modify at 3000 r / min for 5 min, let stand for reaction for 1 h, then add 1 g of stearic acid, mix and modify at 4000 r / min for 15 min, and obtain lipophilic hexagonal boron nitride;

[0127] (3) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, lipophilic hexagonal boron nitride, red iron oxide and benzoin into a high-speed mixer in proportion and mixing them evenly to obtain a premix;

[0128] (4) The premix is ​​extruded into thin sheets through a 130° C. melt extruder, and then pulverized after cooling and sieved through a 160-mesh sieve to obtain a powder coating with high insulation and heat dissipation.

[0129] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 150-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0130] Comparative Example 4

[0131] This embodiment provides a high-insulation and high-heat dissipation powder coating and a preparation method thereof, which are specifically as follows:

[0132] (I) A high-insulation and high-heat dissipation powder coating, comprising the following components by weight:

[0133]

[0134] (II) The preparation method of high insulation and high heat dissipation powder coating is as follows:

[0135] (1) 100 g of spherical boron nitride with a particle size D50 of 50 μm was subjected to high temperature annealing at 900° C. for 2 hours to obtain active spherical boron nitride;

[0136] (2) Add 100 g of active spherical boron nitride and 1 g of triethoxyoctylsilane into a powder modification machine, mix and modify at 3000 r / min for 5 min, let it stand for 1 h, then add 1 g of stearic acid, mix and modify at 4000 r / min for 15 min, and obtain lipophilic spherical boron nitride;

[0137] (3) adding solid epoxy resin, fluorocarbon resin, isocyanate curing agent, lipophilic spherical boron nitride, red iron oxide and benzoin into a high-speed mixer in proportion, mixing evenly to obtain a premix;

[0138] (4) The premix is ​​extruded into thin sheets through a 130° C. melt extruder, and then pulverized after cooling and sieved through a 160-mesh sieve to obtain a powder coating with high insulation and heat dissipation.

[0139] (III) The powder coating was sprayed onto the copper equipment by electrostatic spraying with a spraying thickness of 150-180um, and cured at 200°C for 20min. The sprayed paint film was cooled to obtain the insulation and heat dissipation performance tests of the sprayed paint film. The specific test indicators and results are shown in Table 1.

[0140] Table 1 Paint film test results of embodiments and comparative examples

[0141]

[0142] The test results in Table 1 above show that the high-insulation and high-heat dissipation powder coating provided by the present invention has a coating film thermal conductivity of more than 2W / M·K, thereby improving the heat dissipation function of electronic equipment by more than 10 times, and the electrical breakdown resistance is more than 3KV, ensuring the working safety and stability of electronic components and extending their service life. In addition, the powder coating provided by the present invention also has excellent flexibility, adhesion, flame retardancy and other comprehensive properties.

[0143] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A high insulation and high heat dissipation powder coating, characterized in that: By weight, it includes the following components: 20-30 parts of solid epoxy resin; Fluorocarbon resin 5-10 parts; 3-8 parts of curing agent; 30-70 parts of oleophilic boron nitride; Pigment 1-8 parts; 1-4 parts of benzoin; The oleophilic boron nitride is a mixture of hexagonal boron nitride and spherical boron nitride for surface modification, and the mass ratio of the hexagonal boron nitride to the spherical boron nitride is 1-10:

20.

2. The high insulation and high heat dissipation powder coating according to claim 1, characterized in that: The particle size D50 of the hexagonal boron nitride is 20-35um, and the particle size D50 of the spherical boron nitride is 20-80um.

3. The high insulation and high heat dissipation powder coating according to claim 1, characterized in that: The oleophilic boron nitride is prepared by the following method: Providing hexagonal boron nitride and spherical boron nitride for premixing to obtain a premix A; The premix A is subjected to high temperature annealing treatment to obtain an active boron nitride mixture B; The active boron nitride mixture B is first coated and modified with a silane coupling agent, and then secondly coated and modified with an organic substance to obtain the oleophilic boron nitride.

4. The high insulation and high heat dissipation powder coating according to claim 3, characterized in that: The annealing temperature is 900-1300°C and the time is 2-5H.

5. The high insulation and high heat dissipation powder coating according to claim 3, characterized in that: The mass ratio of the active boron nitride B to the silane coupling agent is 100:1-5; The silane coupling agent is any one or more of triethoxyoctylsilane, aminopropyltrimethoxysilane, polydimethylsilane, propyltrimethoxysilane, bisaminosilane, vinyltrichlorosilane, vinyltrimethoxysilane, mercaptopropyltriethoxysilane, chloropropylmethyldichlorosilane, hexadecyltrimethoxysilane, and octadecyltrimethylsilane.

6. The high insulation and high heat dissipation powder coating according to claim 3, characterized in that: The organic matter is any one or more of stearic acid, zinc stearate, magnesium stearate, hydrogen-containing silicone oil, titanate, aluminate, and zirconate; The mass ratio of the active boron nitride B to the organic matter is 100:1-3.

7. The high insulation and high heat dissipation powder coating according to claim 3, characterized in that: The specific operation of the first coating modification is as follows: adding active boron nitride and silane coupling agent into a powder modification machine, mixing and modifying at 3000-8000 r / min for 5-15 minutes, standing for reaction for 1-12 hours, and completing the first coating modification.

8. The high insulation and high heat dissipation powder coating according to claim 3, characterized in that: The specific operation of the second coating modification is as follows: adding organic matter to the mixture that has undergone the first coating modification, mixing and coating modification at 3000-8000r / min for 10-30min, to achieve the second coating modification.

9. The high insulation and high heat dissipation powder coating according to claim 1, characterized in that: The curing agent is an isocyanate curing agent and / or an amine curing agent; The pigment is a mixture of one or more of an iron oxide pigment, an ultramarine pigment or an organic pigment; The softening temperature of the solid epoxy resin is 90-130°C.

10. The method for preparing the high insulation and high heat dissipation powder coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. The solid epoxy resin, fluorocarbon resin, curing agent, oleophilic boron nitride, pigment and benzoin are added to a high-speed mixer and mixed to obtain a premix; S2. The premix is ​​extruded into flakes, crushed after cooling, and sieved through 160-200 meshes to obtain the high-insulation and high-heat dissipation powder coating.

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