Preparation method of transparent graphene heat dissipation coating

Abstract

The invention relates to the technical field of coating preparation, in particular to a preparation method of a transparent graphene heat dissipation coating. The method comprises the following steps: respectively adding 3-10 parts by weight of expanded graphite and 3-5 parts by weight of sodium carboxymethyl cellulose into 1-2 parts by weight of a modifier, carrying out mean value and ultrasonic treatment, and stirring for a period of time to obtain a modified graphene dispersion liquid; the modified graphene dispersion liquid is subjected to compounding; carrying out drying treatment on the compounded and modified graphene dispersion liquid, so as to obtain graphene powder; sequentially adding 30-75 parts by weight of a solvent, 0.5-3 parts by weight of a second coupling agent, 1-10 parts by weight of modified graphene powder, 15-45 parts by weight of transparent resin and 1-5 parts by weight of a coating additive into a grinding container, and grinding. Graphene is modified, the dispersion stability of graphene in an aqueous solvent or high-transparency resin is improved, agglomeration of graphene materials is avoided, and the graphene materials are uniformly and stably dispersed.

Description

Technical Field

[0001] The invention relates to the technical field of coating preparation, and in particular to a method for preparing a transparent graphene heat dissipation coating. Background Art

[0002] Graphene is a single-layer sheet material composed of carbon atoms in the form of sp 2 The hybrid orbitals are bonded and tightly stacked into a two-dimensional honeycomb lattice structure. Each carbon atom contains an unbonded electron that moves freely in the plane formed by the carbon atom. The carrier mobility of graphene is as high as 15000cm at room temperature. 2 / (V·s), which makes graphene have excellent electrical conductivity, high strength (Young's modulus reaches 1TPa), high thermal conductivity (5300W / (m·k) at room temperature), and extremely high surface area (2630m 2 / g), which is considered to be a new generation of revolutionary materials after silicon. The emergence of new graphene materials provides a new technical approach for the development of a new generation of functional coatings. Because graphene has a unique two-dimensional layered structure, it is evenly dispersed in the coating, and the high thermal conductivity within the graphene layer allows heat to be quickly dispersed throughout the entire layer. In addition, graphene is a new generation of transparent conductive materials. In the visible light region, the transmittance of four-layer graphene is comparable to that of traditional ITO film. In other bands, the transmittance of four-layer graphene is much higher than that of ITO film. Graphene is almost completely transparent, with a transmittance of up to 97.4%. These characteristics make it very suitable as a raw material for transparent electronic products, such as transparent touch screens, light-emitting panels and solar panels, and can also be used in the field of transparent heating.

[0003] There are three main ways of heat transfer, namely heat conduction, heat convection and heat radiation. Among them, heat conduction is mainly to quickly export the generated heat to the surface of the product radiator, while heat convection and heat radiation are mainly to dissipate the heat on the surface of the radiator to the environment. In many fields that require efficient heat dissipation, due to the constraints of space, size and environment, it is impossible to exchange heat by accelerating convection. In recent years, heat transfer technology through heat dissipation coatings has developed rapidly, and the intensification of the world energy crisis has promoted its rise in the civilian field. The key to strengthening surface heat transfer technology lies in the selection of high infrared radiation materials. However, in order to enhance infrared radiation, many ceramic powders such as medical stone, Bian stone, tourmaline, etc. are often used, and the prepared coatings are all in an opaque state. In addition, the heat dissipation efficiency of existing coatings cannot meet the requirements. In order to solve this technical problem, a method for preparing a transparent graphene heat dissipation coating is proposed. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a method for preparing a transparent graphene heat dissipation coating.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions: In a first aspect, in one embodiment provided by the present invention, a method for preparing a transparent graphene heat dissipation coating is provided, the method comprising the following steps: 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose are added to 1 to 2 parts of a modifier by weight, and averaged and ultrasonically treated, and stirred for a period of time to obtain a modified graphene dispersion; and the modified graphene dispersion is compounded; and the compounded modified graphene dispersion is dried to obtain a graphene powder; 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive are added to a grinding container in order for grinding.

[0006] As a further embodiment of the present invention, the modifier is succinic acid.

[0007] As a further solution of the present invention, compounding the modified graphene dispersion includes: compounding the modified graphene with a dispersant via a first coupling agent.

[0008] As a further embodiment of the present invention, the dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals or lignocellulose.

[0009] As a further scheme of the present invention, 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose are added to 1 to 2 parts of a modifier by weight, averaged and ultrasonically treated, and stirred for a period of time to obtain a modified graphene dispersion; and the modified graphene dispersion is compounded; and the compounded modified graphene dispersion is dried to obtain a graphene powder, including: 5 to 8 parts of expanded graphite and 3.5 to 4.5 parts of sodium carboxymethyl cellulose are added to 1.2 to 1.8 parts of the modifier, respectively, and a uniform solution is formed after homogenization and ultrasound. The solution is stirred and reacted at 40 to 50° C. for 6 to 9 hours to fully modify the graphene.

[0010] As a further embodiment of the present invention, 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose are added to 1 to 2 parts of a modifier by weight, and averaged and ultrasonically treated, and stirred for a period of time to obtain a modified graphene dispersion; and the modified graphene dispersion is compounded; and the compounded modified graphene dispersion is dried to obtain a graphene powder, including: Expanded graphite and sodium carboxymethyl cellulose are added to the modifier respectively, and a uniform solution is formed after homogenization and ultrasound. The reaction coating is stirred at a temperature of 42 to 48° C. for 7 to 8 hours to fully modify the graphene.

[0011] As a further embodiment of the present invention, 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose are added to 1 to 2 parts of a modifier by weight, and averaged and ultrasonically treated, and stirred for a period of time to obtain a modified graphene dispersion; and the modified graphene dispersion is compounded; and the compounded modified graphene dispersion is dried to obtain a graphene powder, including: 6 parts of expanded graphite and 4 parts of sodium carboxymethyl cellulose by weight were added to 1.5 parts of the modifier, and a uniform solution was formed after homogenization and ultrasound. The reaction was stirred and coated at 45° C. for 7.5 hours to fully modify the graphene.

[0012] As a further embodiment of the present invention, 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive are sequentially added into a grinding container for grinding, comprising: Add 40 to 65 parts by weight of solvent, 1.5 to 2.5 parts of the second coupling agent, 3 to 8 parts of modified graphene powder, 20 to 35 parts of transparent resin, and 2 to 4 parts of coating additives into a grinding container in sequence, and grind for 2 to 3 hours at a grinding speed of 1000 to 1400 r / min.

[0013] As a further embodiment of the present invention, 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive are sequentially added into a grinding container for grinding, comprising: The grinding time is 2.2 to 2.7 hours, and the grinding speed is 1100 to 1300 r / min.

[0014] As a further embodiment of the present invention, 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive are sequentially added into a grinding container for grinding, comprising: 52 parts by weight of solvent, 2 parts of second coupling agent, 5 parts of modified graphene powder, 30 parts of transparent resin and 2.5 parts of coating additive were added into the grinding container in order and ground for 2.5 hours at a grinding speed of 1200 r / min.

[0015] The technical solution provided by the present invention has the following beneficial effects: The present invention modifies graphene to improve the dispersion and stability of graphene in aqueous solvents or highly transparent resins, avoids the agglomeration of graphene materials, and makes them dispersed evenly and stably. By modifying the surface of graphene, the agglomeration of graphene sheet materials is avoided, and the graphene sheets are dispersed evenly and stably. In the preparation of the coating, the modified graphene is compounded with a dispersant through a coupling agent, and the dispersant is selected as a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency and thermal conductivity of the coating are screened and compared.

[0016] These and other aspects of the present invention will be more clearly understood in the following description of the embodiments. It should be understood that the above general description and the following detailed description are only exemplary and explanatory and cannot limit the present invention. DETAILED DESCRIPTION

[0017] 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.

[0018] The present invention provides a method for preparing a transparent graphene heat dissipation coating, and the method for preparing the transparent graphene heat dissipation coating comprises the following steps: S1. Add 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose by weight to 1 to 2 parts of a modifier, perform averaging and ultrasonic treatment, and stir for a period of time to obtain a modified graphene dispersion; and compound the modified graphene dispersion; and dry the compounded modified graphene dispersion to obtain a graphene powder.

[0019] In an embodiment of the present invention, the modifier is succinic acid.

[0020] In an embodiment of the present invention, compounding the modified graphene dispersion includes compounding the modified graphene with a dispersant through a first coupling agent. The dispersant is a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency, thermal conductivity and other parameters of the coating are screened and compared.

[0021] The dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals or wood cellulose.

[0022] In an embodiment of the present invention, the modified graphene dispersion can be subjected to freeze drying or spray drying to obtain graphene powder.

[0023] In an embodiment of the present invention, the S1, respectively adding 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose by weight to 1 to 2 parts of a modifier, averaging and ultrasonic treatment, and stirring for a period of time to obtain a modified graphene dispersion; and compounding the modified graphene dispersion; drying the compounded modified graphene dispersion to obtain a graphene powder, comprising: 5 to 8 parts of expanded graphite and 3.5 to 4.5 parts of sodium carboxymethyl cellulose are added to 1.2 to 1.8 parts of the modifier, respectively, and a uniform solution is formed after homogenization and ultrasound. The solution is stirred and reacted at 40 to 50° C. for 6 to 9 hours to fully modify the graphene.

[0024] In an embodiment of the present invention, the S1, respectively adding 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose by weight to 1 to 2 parts of a modifier, averaging and ultrasonic treatment, and stirring for a period of time to obtain a modified graphene dispersion; and compounding the modified graphene dispersion; drying the compounded modified graphene dispersion to obtain a graphene powder, comprising: Expanded graphite and sodium carboxymethyl cellulose are added to the modifier respectively, and a uniform solution is formed after homogenization and ultrasound. The reaction coating is stirred at a temperature of 42 to 48° C. for 7 to 8 hours to fully modify the graphene.

[0025] In an embodiment of the present invention, the S1, respectively adding 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose by weight to 1 to 2 parts of a modifier, averaging and ultrasonic treatment, and stirring for a period of time to obtain a modified graphene dispersion; and compounding the modified graphene dispersion; drying the compounded modified graphene dispersion to obtain a graphene powder, comprising: 6 parts of expanded graphite and 4 parts of sodium carboxymethyl cellulose by weight were added to 1.5 parts of the modifier, and a uniform solution was formed after homogenization and ultrasound. The reaction was stirred and coated at 45° C. for 7.5 hours to fully modify the graphene.

[0026] S2. Add 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive into a grinding container for grinding.

[0027] The first coupling agent and the second coupling agent can be KH560\KH570.

[0028] In an embodiment of the present invention, S2, sequentially adding 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive into a grinding container for grinding, comprises: Add 40 to 65 parts by weight of solvent, 1.5 to 2.5 parts of the second coupling agent, 3 to 8 parts of modified graphene powder, 20 to 35 parts of transparent resin, and 2 to 4 parts of coating additives into a grinding container in sequence, and grind for 2 to 3 hours at a grinding speed of 1000 to 1400 r / min.

[0029] In an embodiment of the present invention, S2, sequentially adding 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive into a grinding container for grinding, comprises: The grinding time is 2.2 to 2.7 hours, and the grinding speed is 1100 to 1300 r / min.

[0030] In an embodiment of the present invention, S2, sequentially adding 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive into a grinding container for grinding, comprises: 52 parts by weight of solvent, 2 parts of second coupling agent, 5 parts of modified graphene powder, 30 parts of transparent resin and 2.5 parts of coating additive were added into the grinding container in order and ground for 2.5 hours at a grinding speed of 1200 r / min.

[0031] The present invention modifies graphene to improve the dispersion and stability of graphene in aqueous solvents or highly transparent resins, avoids the agglomeration of graphene materials, and makes them dispersed evenly and stably. By modifying the surface of graphene, the agglomeration of graphene sheet materials is avoided, and the graphene sheets are dispersed evenly and stably. In the preparation of the coating, the modified graphene is compounded with a dispersant through a coupling agent, and the dispersant is selected as a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency and thermal conductivity of the coating are screened and compared.

[0032] Example 1 A method for preparing a transparent graphene heat dissipation coating comprises the following steps: S1. Add 3 parts of expanded graphite and 3 parts of sodium carboxymethyl cellulose by weight to 2 parts of modifier, average and ultrasonically treat, and stir for a period of time to obtain a modified graphene dispersion; and compound the modified graphene dispersion; dry the compounded modified graphene dispersion to obtain graphene powder.

[0033] In an embodiment of the present invention, the modifier is succinic acid.

[0034] In an embodiment of the present invention, compounding the modified graphene dispersion includes compounding the modified graphene with a dispersant through a first coupling agent. The dispersant is a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency, thermal conductivity and other parameters of the coating are screened and compared.

[0035] The dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals and wood cellulose.

[0036] In an embodiment of the present invention, the modified graphene dispersion can be subjected to freeze drying or spray drying to obtain graphene powder.

[0037] In an embodiment of the present invention, the S1, adding 3 parts of expanded graphite and 3 parts of sodium carboxymethyl cellulose by weight to 2 parts of modifiers, averaging and ultrasonic treatment, and stirring for a period of time to obtain a modified graphene dispersion; and compounding the modified graphene dispersion; drying the compounded modified graphene dispersion to obtain a graphene powder, comprising: The reaction coating was stirred at 40°C for 6 hours to fully modify the graphene.

[0038] S2, add 30 parts by weight of solvent, 0.5 parts by weight of second coupling agent, 1 part by weight of modified graphene powder, 15 parts by weight of transparent resin, and 1 part by weight of coating additive into a grinding container and grind for 2 hours at a grinding speed of 1000 r / min.

[0039] The first coupling agent and the second coupling agent can be KH560\KH570.

[0040] Example 2 A method for preparing a transparent graphene heat dissipation coating comprises the following steps: S1. Add 10 parts of expanded graphite and 5 parts of sodium carboxymethyl cellulose by weight to 1 part of modifier, average and ultrasonically treat, and stir for a period of time to obtain a modified graphene dispersion; and compound the modified graphene dispersion; dry the compounded modified graphene dispersion to obtain graphene powder.

[0041] In an embodiment of the present invention, the modifier is succinic acid.

[0042] In an embodiment of the present invention, compounding the modified graphene dispersion includes compounding the modified graphene with a dispersant through a first coupling agent. The dispersant is a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency, thermal conductivity and other parameters of the coating are screened and compared.

[0043] The dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals and wood cellulose.

[0044] In an embodiment of the present invention, the modified graphene dispersion can be subjected to freeze drying or spray drying to obtain graphene powder.

[0045] In an embodiment of the present invention, the S1, 10 parts of expanded graphite and 5 parts of sodium carboxymethyl cellulose by weight are respectively added to 1 part of a modifier, averaged and ultrasonically treated, and stirred for a period of time to obtain a modified graphene dispersion; and the modified graphene dispersion is compounded; the compounded modified graphene dispersion is dried to obtain a graphene powder, including: The reaction coating was stirred at 50°C for 9 hours to fully modify the graphene.

[0046] S2, add 75 parts of solvent, 3 parts of second coupling agent, 10 parts of modified graphene powder, 45 parts of transparent resin, and 1 part of coating additive into a grinding container in order, and grind for 3 hours at a grinding speed of 1400 r / min.

[0047] The first coupling agent and the second coupling agent can be KH560\KH570.

[0048] Example 3 A method for preparing a transparent graphene heat dissipation coating comprises the following steps: S1. Add 5 parts of expanded graphite and 3.5 parts of sodium carboxymethyl cellulose by weight to 1.8 parts of modifier, respectively, and form a uniform solution after homogenization and ultrasound. Stir the reaction coating at 40°C for 6 hours to fully modify the graphene, and compound the modified graphene dispersion; dry the compounded modified graphene dispersion to obtain graphene powder.

[0049] In an embodiment of the present invention, the modifier is succinic acid.

[0050] In an embodiment of the present invention, compounding the modified graphene dispersion includes compounding the modified graphene with a dispersant through a first coupling agent. The dispersant is a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency, thermal conductivity and other parameters of the coating are screened and compared.

[0051] The dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals and wood cellulose.

[0052] In an embodiment of the present invention, the modified graphene dispersion can be subjected to freeze drying or spray drying to obtain graphene powder.

[0053] S2. Add 40 parts by weight of solvent, 1.5 parts of the second coupling agent, 3 parts of modified graphene powder, 20 parts of transparent resin, and 4 parts of coating additives into a grinding container in sequence, and grind for 2 hours at a grinding speed of 1000 r / min.

[0054] The first coupling agent and the second coupling agent can be KH560\KH570.

[0055] Example 4 A method for preparing a transparent graphene heat dissipation coating comprises the following steps: S1. 8 parts of expanded graphite and 4.5 parts of sodium carboxymethyl cellulose are added to 1.8 parts of modifier by weight, and a uniform solution is formed after homogenization and ultrasound. The reaction coating is stirred at 50°C for 9 hours to fully modify the graphene, and the modified graphene dispersion is compounded; the compounded modified graphene dispersion is dried to obtain graphene powder.

[0056] In an embodiment of the present invention, the modifier is succinic acid.

[0057] In an embodiment of the present invention, compounding the modified graphene dispersion includes compounding the modified graphene with a dispersant through a first coupling agent. The dispersant is a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency, thermal conductivity and other parameters of the coating are screened and compared.

[0058] The dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals and wood cellulose.

[0059] In an embodiment of the present invention, the modified graphene dispersion can be subjected to freeze drying or spray drying to obtain graphene powder.

[0060] S2. Add 65 parts of solvent, 2.5 parts of second coupling agent, 8 parts of modified graphene powder, 20 parts of transparent resin and 2 parts of coating additive into the grinding container in order, and grind for 3 hours at a grinding speed of 1400 r / min.

[0061] The first coupling agent and the second coupling agent can be KH560\KH570.

[0062] Example 5 A method for preparing a transparent graphene heat dissipation coating comprises the following steps: S1. Add 6 parts of expanded graphite and 4 parts of sodium carboxymethyl cellulose by weight to 1.5 parts of modifier, form a uniform solution after homogenization and ultrasound, stir the reaction coating at 45°C for 7.5 hours to obtain a modified graphene dispersion; and compound the modified graphene dispersion; dry the compounded modified graphene dispersion to obtain graphene powder.

[0063] In an embodiment of the present invention, the modifier is succinic acid.

[0064] In an embodiment of the present invention, compounding the modified graphene dispersion includes compounding the modified graphene with a dispersant through a first coupling agent. The dispersant is a medium-length network molecule with a molecular weight limited to 2000 to 10000, and the effects of different polymer materials on the transparency, thermal conductivity and other parameters of the coating are screened and compared.

[0065] The dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals and wood cellulose.

[0066] In an embodiment of the present invention, the modified graphene dispersion can be subjected to freeze drying or spray drying to obtain graphene powder.

[0067] S2. Add 52 parts of solvent, 2 parts of second coupling agent, 5 parts of modified graphene powder, 30 parts of transparent resin and 2.5 parts of coating additive into a grinding container in order, and grind for 2.5 hours at a grinding speed of 1200 r / min.

[0068] The first coupling agent and the second coupling agent can be KH560\KH570.

[0069] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for preparing a transparent graphene heat dissipation coating, characterized in that: The method includes: 3 to 10 parts of expanded graphite and 3 to 5 parts of sodium carboxymethyl cellulose are added to 1 to 2 parts of a modifier by weight, and averaged and ultrasonically treated, and stirred for a period of time to obtain a modified graphene dispersion; and the modified graphene dispersion is compounded; and the compounded modified graphene dispersion is dried to obtain a graphene powder; 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive are added to a grinding container in order for grinding.

2. The method for preparing the transparent graphene heat dissipation coating according to claim 1, characterized in that: The modifier is succinic acid.

3. The method for preparing the transparent graphene heat dissipation coating according to claim 1, characterized in that: Compounding the modified graphene dispersion includes: compounding the modified graphene with a dispersant via a first coupling agent.

4. The method for preparing the transparent graphene heat dissipation coating according to claim 1, characterized in that: The dispersant is one of polyvinyl alcohol, polyvinyl pyrrolidone, piperazine crystals or wood cellulose.

5. The method for preparing the transparent graphene heat dissipation coating according to claim 1, characterized in that: The method comprises adding 3 to 10 parts by weight of expanded graphite and 3 to 5 parts by weight of sodium carboxymethyl cellulose to 1 to 2 parts of a modifier, performing averaging and ultrasonic treatment, and stirring for a period of time to obtain a modified graphene dispersion; and compounding the modified graphene dispersion; The compounded modified graphene dispersion is dried to obtain graphene powder, including: 5 to 8 parts of expanded graphite and 3.5 to 4.5 parts of sodium carboxymethyl cellulose are added to 1.2 to 1.8 parts of the modifier, respectively, and a uniform solution is formed after homogenization and ultrasound. The solution is stirred and reacted at 40 to 50° C. for 6 to 9 hours to fully modify the graphene.

6. The method for preparing the transparent graphene heat dissipation coating according to claim 5, characterized in that: 3 to 10 parts by weight of expanded graphite and 3 to 5 parts by weight of sodium carboxymethyl cellulose are added to 1 to 2 parts of a modifier, respectively, and subjected to averaging and ultrasonic treatment, and then stirred for a period of time to obtain a modified graphene dispersion; and compounding the modified graphene dispersion; The compounded modified graphene dispersion is dried to obtain graphene powder, including: Expanded graphite and sodium carboxymethyl cellulose are added to the modifier respectively, and a uniform solution is formed after homogenization and ultrasound. The reaction coating is stirred at a temperature of 42 to 48° C. for 7 to 8 hours to fully modify the graphene.

7. The method for preparing the transparent graphene heat dissipation coating according to claim 6, characterized in that: 3 to 10 parts by weight of expanded graphite and 3 to 5 parts by weight of sodium carboxymethyl cellulose are added to 1 to 2 parts of a modifier, respectively, and subjected to averaging and ultrasonic treatment, and then stirred for a period of time to obtain a modified graphene dispersion; and compounding the modified graphene dispersion; The compounded modified graphene dispersion is dried to obtain graphene powder, including: 6 parts of expanded graphite and 4 parts of sodium carboxymethyl cellulose by weight were added to 1.5 parts of the modifier, and a uniform solution was formed after homogenization and ultrasound. The reaction was stirred and coated at 45° C. for 7.5 hours to fully modify the graphene.

8. The method for preparing the transparent graphene heat dissipation coating according to claim 1, characterized in that: Add 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive into a grinding container for grinding, including: Add 40 to 65 parts by weight of solvent, 1.5 to 2.5 parts of the second coupling agent, 3 to 8 parts of modified graphene powder, 20 to 35 parts of transparent resin, and 2 to 4 parts of coating additives into a grinding container in sequence, and grind for 2 to 3 hours at a grinding speed of 1000 to 1400 r / min.

9. The method for preparing the transparent graphene heat dissipation coating according to claim 8, characterized in that: Add 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive into a grinding container for grinding, including: The grinding time is 2.2 to 2.7 hours, and the grinding speed is 1100 to 1300 r / min.

10. The method for preparing the transparent graphene heat dissipation coating according to claim 9, characterized in that: Add 30 to 75 parts by weight of a solvent, 0.5 to 3 parts by weight of a second coupling agent, 1 to 10 parts by weight of a modified graphene powder, 15 to 45 parts by weight of a transparent resin, and 1 to 5 parts by weight of a coating additive into a grinding container for grinding, including: 52 parts by weight of solvent, 2 parts of second coupling agent, 5 parts of modified graphene powder, 30 parts of transparent resin and 2.5 parts of coating additive were added into the grinding container in order and ground for 2.5 hours at a grinding speed of 1200 r / min.