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CN-121975433-A - Environment-friendly graphene heat dissipation coating and preparation method thereof

CN121975433ACN 121975433 ACN121975433 ACN 121975433ACN-121975433-A

Abstract

The invention is suitable for the technical field of paint, and provides an environment-friendly graphene heat dissipation paint and a preparation method thereof, and the preparation method comprises the following steps of adding a catalyst into glycidyl methacrylate and a silane coupling agent for ring-opening polymerization reaction to obtain a modified silane coupling agent; adding gallic acid or derivatives thereof into the modified silane coupling agent for continuous reaction to obtain a coating matrix, adding graphene into the coating matrix for ultrasonic homogenization, and uniformly mixing the cured resin and the coating matrix to obtain the graphene heat-dissipating coating. According to the invention, gallic acid and derivatives thereof are introduced as polyphenol crosslinking agents, and modified silane coupling agents are adopted, so that the problems of easy aggregation and difficult dispersion of graphene in a system are solved, covalent bonding between graphene and an organic resin matrix is realized, interface thermal resistance is effectively reduced, phonon transmission efficiency is improved, and the graphene-organic resin composite material has high thermal conductivity and strong heat radiation capability.

Inventors

  • ZHANG LONG
  • MA JINGYING

Assignees

  • 吉林省隆烯材料科技有限公司

Dates

Publication Date
20260505
Application Date
20260306

Claims (10)

  1. 1. The preparation method of the environment-friendly graphene heat dissipation coating is characterized by comprising the following steps of: 1) Adding a catalyst into glycidyl methacrylate and a silane coupling agent to perform ring-opening polymerization reaction to obtain a modified silane coupling agent, wherein the mass ratio of the glycidyl methacrylate to the silane coupling agent is 1:3-2:1; 2) Adding gallic acid or a derivative thereof into a modified silane coupling agent for continuous reaction to obtain a coating matrix, wherein the mass ratio of the modified silane coupling agent to the gallic acid or the derivative thereof is 3:1-7:1; 3) Adding graphene into a coating matrix, and carrying out ultrasonic homogenization to uniformly disperse the graphene in the coating matrix, wherein the addition amount of the graphene is 5% -8% of the mass of the coating matrix; 4) And uniformly mixing the cured resin with the coating matrix to obtain the graphene heat-dissipating coating, wherein the addition amount of the cured resin is 5% -20% of the total mass of the cured resin and the coating matrix.
  2. 2. The preparation method of the environment-friendly graphene heat dissipation coating according to claim 1, wherein in the step 1), the silane coupling agent is one or more of ‌ -aminopropyl triethoxysilane, gamma- (2, 3-glycidoxy) propyl trimethoxysilane, gamma-methacryloxypropyl trimethoxysilane and vinyl triethoxysilane.
  3. 3. The preparation method of the environment-friendly graphene heat dissipation coating according to claim 1 is characterized in that in the step 1), the catalyst is one or more of p-toluenesulfonic acid, methanesulfonic acid, tungstic silicic acid, phosphomolybdic acid and phosphotungstic acid, and the addition amount of the catalyst is 5-3% of the total mass of glycidyl methacrylate and a silane coupling agent.
  4. 4. The preparation method of the environment-friendly graphene heat dissipation coating according to claim 1, wherein in the step 1), the reaction temperature of the ring-opening-polymerization reaction is 50-180 ℃ and the reaction time is 2-10 hours.
  5. 5. The method for preparing the environment-friendly graphene heat dissipation coating according to claim 1, wherein in the step 2), the gallic acid or the derivative thereof is one or more of gallic acid, pyrogallic acid, lauryl gallate, methyl gallate and propyl gallate.
  6. 6. The preparation method of the environment-friendly graphene heat dissipation coating according to claim 1, wherein in the step 2), the reaction temperature is 50-180 ℃ and the reaction time is 30-300 min.
  7. 7. The preparation method of the environment-friendly graphene heat dissipation coating according to claim 1, wherein in the step 3), the number of graphene layers is 1-10, the specific surface area is 100-800 m 2 /g, and the radial dimension is 0.5-5 μm.
  8. 8. The preparation method of the environment-friendly graphene heat dissipation coating according to claim 1, wherein in the step 3), ultrasonic power of ultrasonic homogenization is 30-3000W, ultrasonic time is 30-300 min, homogenizing pressure is 40-120 MPa, and homogenizing time is 10-60 min.
  9. 9. The method for preparing the environment-friendly graphene heat dissipation coating according to claim 1, wherein in the step 4), the curing resin is one or more of aqueous acrylic resin, aqueous organosilicon modified acrylic resin, amino resin, vinyl resin and melamine resin.
  10. 10. An environment-friendly graphene heat dissipation coating, which is characterized by being prepared by the preparation method according to any one of claims 1-9.

Description

Environment-friendly graphene heat dissipation coating and preparation method thereof Technical Field The invention belongs to the technical field of coatings, and particularly relates to an environment-friendly graphene heat dissipation coating and a preparation method thereof. Background With the high-speed development of the electronic industry, modern electronic equipment is becoming a high-density assembled highly integrated system increasingly, so that the heat flux density of products is becoming larger, if the heat dissipation capacity of the products is insufficient, the temperature of components and circuits is increased, the thermal deformation and thermal failure of the equipment are caused, the performance and the service life of the electronic products are affected, and in addition, in the fields of metallurgy, petrochemical industry, ceramics, medicine and the like, various industrial boilers, power station boilers, flame furnaces and other furnace bodies are often involved, and the heat dissipation performance is critical to the safety of personnel and the reliable operation of the equipment. Therefore, how to improve the heat dissipation performance of devices in the electronic industry and other fields has become an important subject for advancing the industry. The heat dissipation coating is a special coating for enhancing the heat dissipation performance of an object by improving the radiation efficiency (especially the infrared radiation efficiency) of the surface of the object, and has the advantages of low cost, simple implementation and the like. The graphene has very high heat conductivity and extremely strong emissivity, the heat conductivity of single-layer graphene can reach 5300W/m.K, and the heat radiation emissivity is 0.99 in the infrared range, so that the graphene has great potential as a heat radiation heat dissipation material. However, the application of the graphene in the aspect of paint at present has a plurality of problems that the graphene is easy to agglomerate and difficult to disperse in a solvent, and the low content of the graphene in the solvent is not beneficial to exerting the excellent heat dissipation performance of the graphene. In the prior art, graphene is dispersed in a solvent by adding a dispersing agent, but the obtained graphene has very low content or the proportion of an additive is very high or the graphene content of the coating is relatively low, the industrialization is difficult or not easy to realize due to the low graphene content, the advantage of the graphene per se is difficult to be exerted due to the high proportion of the dispersing agent, the graphene slurry content is only 5-7 parts as disclosed in CN108250890A, the content of the graphene slurry is only 1-5 mg/L and the number of the additives is relatively large as disclosed in CN108394892A, the resin added into the graphene heat dissipation coating is relatively large as disclosed in CN108276867A, the formation of finer graphene particles is not easy to realize due to the step of forming the coating, and the aggregation of graphene is not easy to emit heat. Disclosure of Invention The embodiment of the invention aims to provide a preparation method of an environment-friendly graphene heat dissipation coating, which aims to solve the problems in the background art. The embodiment of the invention is realized in such a way that the preparation method of the environment-friendly graphene heat dissipation coating comprises the following steps: 1) Adding a catalyst into glycidyl methacrylate and a silane coupling agent to perform ring-opening polymerization reaction to obtain a modified silane coupling agent, wherein the mass ratio of the glycidyl methacrylate to the silane coupling agent is 1:10-5:1; 2) Adding gallic acid or a derivative thereof into a modified silane coupling agent for continuous reaction to obtain a coating matrix, wherein the mass ratio of the modified silane coupling agent to the gallic acid or the derivative thereof is 1:1-10:1; 3) Adding graphene into a coating matrix, and carrying out ultrasonic homogenization to uniformly disperse the graphene in the coating matrix, wherein the addition amount of the graphene is 3% -12% of the mass of the coating matrix; 4) And uniformly mixing the cured resin with the coating matrix to obtain the graphene heat-dissipating coating, wherein the addition amount of the cured resin is 5% -20% of the total mass of the cured resin and the coating matrix. The embodiment of the invention also aims to provide an environment-friendly graphene heat dissipation coating, which is prepared by the preparation method. Compared with the prior art, the preparation method provided by the embodiment of the invention has the following advantages: 1. The raw materials have both environmental protection and performance, and meanwhile, the production process is more environment-friendly, and the development trend of green products is met; 2. The p