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CN-122011541-A - Heat-conducting polymer and heat-conducting product prepared from same

CN122011541ACN 122011541 ACN122011541 ACN 122011541ACN-122011541-A

Abstract

The invention provides a heat conducting polymer and a heat conducting product prepared from the heat conducting polymer, wherein the heat conducting polymer comprises 5-10wt% of graphene dispersion liquid, 10-20wt% of aluminum oxide and 70-85wt% of base resin. Firstly mixing graphene with a dispersing agent at normal temperature, carrying out ultrasonic treatment to obtain graphene dispersion liquid, adding alumina powder into the dispersing agent, fully stirring to enable the surface of the alumina powder to be fully soaked to obtain surface-treated alumina powder, mixing base resin with the graphene dispersion liquid and the surface-treated alumina powder, uniformly stirring, drying and carrying out compression molding. The thermal conductivity of the obtained resin composite material can reach 6.2-7.5W/mK.

Inventors

  • CHEN CHAO
  • WANG JING

Assignees

  • 北京赛纳吉科技发展有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (9)

  1. 1. The high-heat-conductivity resin composite material comprises, by mass, 5-10wt% of graphene dispersion liquid, 10-20wt% of alumina powder and 70-85wt% of base resin.
  2. 2. The high thermal conductivity resin composite material according to claim 1, wherein the graphene dispersion liquid is obtained by adding graphene to a graphene dispersing agent; the graphene dispersing agent is a polymer dispersing agent, and can be one or two of polyvinyl alcohol and polyacrylamide; in the graphene dispersion liquid, the mass concentration of graphene is 0.5-1.5%.
  3. 3. The high thermal conductive resin composite material according to claim 1 or 2, wherein the particle diameter of the alumina powder is 0.1 to 100 μm.
  4. 4. The high thermal conductivity resin composite material according to claim 1 or 2, wherein the alumina powder is subjected to surface treatment, and the surface treatment is performed by dissolving the alumina powder in a dispersing agent, and sufficiently stirring the mixture to sufficiently infiltrate the surface of the alumina powder; The dispersing agent is an ethanol solution with the mass concentration of 40-80% or a methanol solution with the mass concentration of 40-80%; the ratio of the alumina powder to the dispersing agent is 100g:5-10mL.
  5. 5. The high thermal conductivity resin composite according to claim 4, wherein said dispersant further comprises a binder and a lubricant; The binder is one or two of polyvinyl alcohol and polyvinyl butyral; the lubricant is one or two of polyvinylpyrrolidone and sodium polyacrylate; In the dispersing agent, the mass concentration of the binder is 0.01-0.05g/mL; The mass concentration of the lubricant is 0.01-0.05g/mL.
  6. 6. The high thermal conductivity resin composite according to claim 1, wherein the base resin is a polyethylene resin.
  7. 7. The high thermal conductivity resin composite according to claim 1, wherein the high thermal conductivity resin composite has a thermal conductivity in the range of 6.2-7.5W/mK.
  8. 8. A method of preparing the high thermal conductivity resin composite according to any one of claims 1 to 7, comprising the steps of: (1) Adding graphene into the graphene dispersing agent under normal temperature, uniformly stirring, and performing ultrasonic treatment to obtain graphene dispersion; (2) Adding the alumina powder into the dispersing agent, and fully stirring to fully infiltrate the surface of the alumina powder to obtain the surface-treated alumina powder; (3) Mixing the substrate resin with the graphene dispersion liquid prepared in the step (1) and the surface-treated alumina powder prepared in the step (2), and uniformly stirring to uniformly distribute the graphene and the alumina powder on the surface of the resin; (4) Drying the mixture obtained in the step (3); (5) And performing thermoforming operation on the dried mixture to obtain the product.
  9. 9. A thermally conductive product made from the high thermal conductivity resin composite material according to any one of claims 1 to 7.

Description

Heat-conducting polymer and heat-conducting product prepared from same Technical Field The invention belongs to the field of heat-conducting polymer composite materials, and particularly relates to a heat-conducting polymer and a heat-conducting product prepared from the heat-conducting polymer. Background The heat conducting polymer material is one based on polymer and has excellent heat conducting performance at specific temperature. The high-heat-conductivity high-temperature-resistant ceramic material has the advantages of high heat conductivity, high temperature resistance, simple preparation, high mechanical property and the like, and plays a key role in a plurality of fields. Graphene, which is a two-dimensional carbon material, has extremely high thermal conductivity and excellent electrical properties, and alumina is widely used in various composite materials due to its high thermal and chemical stability. However, how to effectively combine the advantages of the two, and to prepare a polymer composite material with both high thermal conductivity and good processability is a current research focus. Disclosure of Invention The invention aims to solve the problem of uneven dispersion of graphene and alumina in a polymer, and provides a high-heat-conductivity resin composite material, which is prepared by dispersing graphene in a dispersion liquid, uniformly mixing the graphene with alumina powder and a polymer (base resin) subjected to surface treatment, and then performing thermoforming; the invention also obtains the high heat conduction resin composite material with optimal performance by regulating and controlling the proportion of different components. The high-heat-conductivity resin composite material provided by the invention comprises the following components, by weight, 5-10wt% of graphene dispersion liquid, 10-20wt% of alumina powder and 70-85wt% of base resin. Wherein the graphene dispersion is obtained by adding graphene to a graphene dispersing agent; The graphene can be prepared by an oxidation-reduction method, a microwave method and a physical stripping method; the graphene dispersing agent is a polymer dispersing agent, and can be one or two of polyvinyl alcohol and polyacrylamide; In the graphene dispersion liquid, the mass concentration of graphene is 0.5-1.5%, and can be specifically 1%; the particle size of the alumina powder can be 0.1-100 μm, and can be 20 μm or 50 μm; The alumina powder is subjected to surface treatment, wherein the surface treatment is carried out by dissolving the alumina powder in a dispersing agent, and fully stirring to fully infiltrate the surface of the alumina powder; The dispersing agent is an ethanol solution with the mass concentration of 40-80% or a methanol solution with the mass concentration of 40-80%; The ratio of the alumina powder to the dispersing agent can be 100g:5-10mL, and can be 100g:5 mL and 200g:20mL; the dispersant further comprises a binder and a lubricant; The binder is one or two of polyvinyl alcohol and polyvinyl butyral; the lubricant is one or two of polyvinylpyrrolidone and sodium polyacrylate; in the dispersing agent, the mass concentration of the binder can be 0.01-0.05g/mL, and can be specifically 0.04g/mL; the mass concentration of the lubricant can be 0.01-0.05g/mL, and can be specifically 0.04g/mL; the base resin may be a polyethylene resin. The high-heat-conductivity resin composite material is prepared by a method comprising the following steps: (1) Adding graphene into the graphene dispersing agent under normal temperature, uniformly stirring, and performing ultrasonic treatment to obtain graphene dispersion; (2) Adding the alumina powder into the dispersing agent, and fully stirring to fully infiltrate the surface of the alumina powder to obtain the surface-treated alumina powder; (3) Mixing the substrate resin with the graphene dispersion liquid prepared in the step (1) and the surface-treated alumina powder prepared in the step (2), and uniformly stirring to uniformly distribute the graphene and the alumina powder on the surface of the resin; (4) Drying the mixture obtained in the step (3); (5) And performing thermoforming operation on the dried mixture to obtain the product. The heat conduction product prepared from the high heat conduction resin composite material also belongs to the protection scope of the invention. The thermally conductive product may specifically be a thermally conductive film. According to the invention, graphene is dispersed into a dispersion liquid, uniformly mixed with the alumina powder subjected to surface treatment and the base resin, and then subjected to thermoforming to obtain the high-heat-conductivity resin composite material. The preparation method is simple, does not need a large amount of organic solvents, and is environment-friendly. Detailed Description The following detailed description of the invention is provided in connection with the accompanying drawings that are prese