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CN-122012024-A - Preparation method of heat dissipation material based on porous alumina coated hollow glass beads, heat dissipation material and heat dissipation fin

CN122012024ACN 122012024 ACN122012024 ACN 122012024ACN-122012024-A

Abstract

The invention relates to the technical field of heat dissipation, in particular to a preparation method of a heat dissipation material based on porous alumina coated hollow glass beads, a heat dissipation material and a heat dissipation fin. The preparation method of the porous alumina coated hollow glass bead-based heat dissipation material comprises the following steps of etching the hollow glass beads in an acidic fluoride solution to obtain perforated hollow glass beads, reacting the perforated hollow glass beads with an aluminum potassium sulfate solution under neutral or alkaline conditions, performing solid-liquid separation, washing by adopting an ammonium salt solution, then calcining, and immersing the perforated hollow glass beads coated by porous gamma-type alumina in a liquid medium. The hollow glass beads are used as a carrier, the porous structure can store liquid medium, the formed heat dissipation layer liquid medium evaporates at a heated end to absorb heat, steam condenses at a condensing end to release heat, and liquid flows back through the pore structure of the microspheres to complete an efficient heat transmission cycle, so that the heat dissipation effect is improved.

Inventors

  • ZHANG QING
  • BA ZHONGYANG
  • ZHANG YINGCAI
  • Lv Shuaikang

Assignees

  • 郑州圣莱特空心微珠新材料有限公司

Dates

Publication Date
20260512
Application Date
20260123

Claims (10)

  1. 1. The preparation method of the heat dissipation material based on the porous alumina coated hollow glass beads is characterized by comprising the following steps of: (1) Etching the hollow glass beads in an acid fluoride solution to enable the outer walls of the hollow glass beads to have a pore channel structure penetrating through the outer parts and the inner cavities of the hollow glass beads, so as to obtain perforated hollow glass beads; (2) Reacting the perforated hollow glass beads with aluminum potassium sulfate solution under neutral or alkaline conditions, performing solid-liquid separation after the reaction is finished, washing by adopting ammonium salt solution to enable ammonium ions to replace potassium ions, and calcining to obtain perforated hollow glass beads coated by porous gamma-type alumina; (3) The porous gamma-alumina coated perforated hollow glass beads are subjected to vacuum impregnation in a liquid medium, so that the liquid medium enters the inner cavities of the hollow glass beads from the pores of the alumina and the through-hole structures of the outer walls of the hollow glass beads, and the liquid medium is used for carrying away heat through evaporation-condensation circulation.
  2. 2. The preparation method of the heat dissipation material based on the porous alumina coated hollow glass beads is characterized in that in the step (1), the acidic fluoride solution is obtained by dissolving sodium fluoride and hydrochloric acid in water, the mass fractions of the sodium fluoride and the hydrochloric acid in the water are 1.25-3%, and the mass fractions of the sodium fluoride and the hydrochloric acid corresponding to each 50g of hollow glass beads are 2.5-3 g.
  3. 3. The method for preparing the heat dissipation material based on porous alumina coated hollow glass beads according to claim 1, wherein in the step (2), 150-200 g of aluminum potassium sulfate with a concentration of 1.6-2 mol/L is added to 10-15 g of perforated hollow glass beads.
  4. 4. The method for preparing the porous alumina coated hollow glass microsphere-based heat dissipation material according to claim 1, wherein in the step (2), the reaction temperature is 60-80 ℃, the system ph=7-9 during the reaction, and the reaction time is 1-2 hours.
  5. 5. The method for preparing the porous alumina coated hollow glass microsphere-based heat dissipation material according to claim 1, wherein in the step (2), the calcination temperature is 450-900 ℃ and the calcination time is 3-5 h.
  6. 6. The method for preparing the heat dissipation material based on the porous alumina coated hollow glass beads according to claim 1, wherein the average pore diameter of the porous structure in gamma-type alumina is 14-20 nm, and the specific surface area is 300-400 m 2 /g.
  7. 7. The method for preparing a heat dissipating material based on porous alumina coated hollow glass beads according to claim 1, wherein the liquid medium is one or more selected from the group consisting of water, alcohol, methanol, and acetone.
  8. 8. A heat dissipation material based on porous alumina coated hollow glass beads is characterized by comprising the hollow glass beads and porous gamma-type alumina coated on the surfaces of the hollow glass beads, wherein the outer walls of the hollow glass beads are provided with pore channel structures penetrating through the outer parts and inner cavities of the hollow glass beads, and liquid media are filled in the inner cavities, the pore channel structures and the pores of the porous gamma-type alumina of the hollow glass beads and used for carrying away heat through evaporation-condensation circulation.
  9. 9. A radiating fin is characterized by comprising a radiating material layer and heat conducting glue wrapping the radiating material layer, wherein a protective film is fixedly bonded on the outer side of the heat conducting glue, and the radiating material layer comprises the radiating material prepared by the preparation method of the radiating material based on porous alumina coated hollow glass beads as claimed in any one of claims 1 to 7 or the radiating material based on porous alumina coated hollow glass beads as claimed in claim 8.
  10. 10. The heat sink of claim 9, wherein the heat sink material layer has a thickness of 30-200 μm.

Description

Preparation method of heat dissipation material based on porous alumina coated hollow glass beads, heat dissipation material and heat dissipation fin Technical Field The invention relates to the technical field of heat dissipation, in particular to a preparation method of a heat dissipation material based on porous alumina coated hollow glass beads, a heat dissipation material and a heat dissipation fin. Background As the demand for high definition, high color gamut display panels continues to increase, the high resolution screen market becomes particularly important. But the screen resolution increases and the Integrated Circuit (IC) power consumption also increases dramatically, causing the IC side area temperature to rise. For a screen display, temperature non-uniformities may cause the screen to shift color, such as for a Liquid Crystal Display (LCD) display, the color point of the higher temperature region may shift blue. Therefore, heat dissipation at the IC becomes particularly important. Currently, a common heat dissipation scheme in the market uses graphite sheets for heat dissipation and VC for heat dissipation at a flexible circuit board (FPC) bending joint. Graphite flake heat dissipation is a low cost heat dissipation method commonly used at present, but for chips with instantaneous high heat flux (e.g. exceeding 10W/cm 2), the "soaking" capability can reach the bottleneck and cannot effectively carry heat away from the heat source. For example, chinese patent No. CN105163564B issued in 31 st 7 2018 discloses a graphite heat sink and a liquid crystal display device, wherein the graphite heat sink comprises a graphite substrate and a black protective film (PET film) surrounding the graphite substrate, the liquid crystal display device comprises a graphite heat sink, a heat conductive silica gel layer and a heat source body, the graphite heat sink is combined with the heat source body through the heat conductive silica gel layer to dissipate heat from the heat source body, and the graphite substrate has different thicknesses to conduct heat directionally. VC heat dissipation is a thermal management solution with extremely high heat transfer efficiency, but it is far less advantageous than graphite flake in thickness, manufacturing process and cost, and VC heat sinks are typically a more rigid flat plate (e.g. vacuum sealed copper plate), inflexible, and have requirements on structural design, and limit their large area use. In recent years, more efficient thermal management schemes such as two-dimensional materials (hexagonal boron nitride films and graphene films) with higher thermal conductivity have also been sought, but they have been limited to laboratory studies. In addition, the heat dissipation of the graphite sheet is good in heat conduction in the plane (X-Y axis) direction and can reach 1500-2000W/(m.K), but poor in heat conduction in the thickness (Z axis) direction, and the graphite sheet is mainly responsible for 'diffusing' heat, but not 'transferring' heat, and the graphene and hexagonal boron nitride films are of layered structures and have the same problems. Therefore, there is a strong need for a low-cost thermal management solution with isotropic ultra-high thermal conductivity, light and thin, and different usage scenarios. Disclosure of Invention The first aim of the invention is to provide a preparation method of a heat dissipation material based on porous alumina coated hollow glass beads, which solves the problem of poor heat dissipation effect of the existing heat dissipation material. The second purpose of the invention is to provide a heat dissipation material based on porous alumina coated hollow glass beads, which solves the problem of poor heat dissipation effect of the existing heat dissipation material. The third objective of the present invention is to provide a heat sink, which solves the problem of poor heat dissipation effect of the existing heat sink. In order to solve the technical problems, the technical scheme of the preparation method of the heat dissipation material based on the porous alumina coated hollow glass beads is as follows: A preparation method of a heat dissipation material based on porous alumina coated hollow glass beads comprises the following steps: (1) Etching the hollow glass beads in an acid fluoride solution to enable the outer walls of the hollow glass beads to have a pore channel structure penetrating through the outer parts and the inner cavities of the hollow glass beads, so as to obtain perforated hollow glass beads; (2) Reacting the perforated hollow glass beads with aluminum potassium sulfate solution under neutral or alkaline conditions, performing solid-liquid separation after the reaction is finished, washing by adopting ammonium salt solution to enable ammonium ions to replace potassium ions, and calcining to obtain perforated hollow glass beads coated by porous gamma-type alumina; (3) The porous gamma-alumina coated perfora