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CN-121974724-A - Heat insulation composite material and preparation method thereof

CN121974724ACN 121974724 ACN121974724 ACN 121974724ACN-121974724-A

Abstract

The invention discloses a heat-insulating composite material and a preparation method thereof, wherein the heat-insulating composite material comprises, by weight, 40-60 parts of aluminum silicate ceramic fibers, 20-30 parts of aluminum oxide hollow spheres, 10-15 parts of nano silicon dioxide aerogel, 5-10 parts of silicon carbide whiskers, 1-3 parts of silane coupling agents, 0.2-1 part of dispersing agents and 8-12 parts of aluminum dihydrogen phosphate solutions, and the heat-insulating composite material has lower heat conductivity and excellent mechanical properties by limiting the raw materials, so that market demands can be better met.

Inventors

  • YANG QIONG
  • LIN JIANHUI
  • LIN ZHIWEI

Assignees

  • 佛山市置维胶粘制品有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (9)

  1. 1. The heat-insulating composite material is characterized by comprising the following raw materials in parts by weight: 40-60 parts of aluminum silicate ceramic fiber, 20-30 parts of aluminum oxide hollow spheres, 10-15 parts of nano silicon dioxide aerogel, 5-10 parts of silicon carbide whisker, 1-3 parts of silane coupling agent, 0.2-1 part of dispersing agent and 8-12 parts of aluminum dihydrogen phosphate solution.
  2. 2. The heat-insulating composite material according to claim 1, wherein the heat-insulating composite material comprises the following raw materials in parts by weight: 50 parts of aluminum silicate ceramic fiber, 25 parts of aluminum oxide hollow sphere, 12 parts of nano silicon dioxide aerogel, 8 parts of silicon carbide whisker, 2 parts of silane coupling agent, 0.8 part of dispersing agent and 10 parts of aluminum dihydrogen phosphate solution.
  3. 3. The heat insulation composite of claim 1 or 2, wherein the concentration of the aluminum dihydrogen phosphate solution is 40% -60%.
  4. 4. The thermal insulation composite according to claim 1 or 2, wherein the silane coupling agent is KH-560.
  5. 5. The heat insulation composite of claim 1 or 2, wherein the dispersant is sodium polyacrylate.
  6. 6. The method for preparing the heat-insulating composite material according to any one of claims 1 to 5, which is characterized by comprising the following steps: (a) Dissolving a silane coupling agent in absolute ethyl alcohol, spraying the silane coupling agent on the surface of the dried alumina hollow sphere, and drying to obtain a pretreated alumina hollow sphere; (b) Uniformly mixing aluminum silicate ceramic fibers, pretreated aluminum oxide hollow spheres, nano silicon dioxide aerogel and silicon carbide whiskers, and then adding a dispersing agent and a aluminum hydrogen phosphate solution for wet mixing to obtain a mixture; (c) And carrying out compression molding on the mixture, sintering and cooling to obtain the heat-insulating composite material.
  7. 7. The method according to claim 6, wherein in the step (a), the drying temperature is 90-100 ℃ and the time is 2-3 hours.
  8. 8. The method according to claim 6, wherein in the step (c), the compression molding pressure is 8 to 12mpa and the time is 4 to 8min.
  9. 9. The method according to claim 6, wherein in the step (C), the sintering temperature is 780-850 ℃ and the time is 1.8-3 hours.

Description

Heat insulation composite material and preparation method thereof Technical Field The invention relates to the technical field of heat insulation materials, in particular to a heat insulation composite material and a preparation method thereof. Background When the electrical equipment runs, a large amount of heat is generated, the traditional organic insulating materials (such as polyester film and epoxy resin) are easy to age at high temperature, the dielectric property is reduced, and the combustion risk exists. Inorganic materials are resistant to high temperature and incombustible, but have the defects of high heat conductivity coefficient (such as about 30W/(m.K) of alumina ceramic), ineffective heat insulation, high brittleness, easy cracking and difficult adaptation to the vibration environment of electrical equipment when being used alone. In the prior art, the organic components of the inorganic-organic composite material still have ageing risk, so that development of a composite material which takes the inorganic material as a main body and has low heat conduction and high temperature resistance is needed. Disclosure of Invention The invention aims to provide a heat-insulating composite material and a preparation method thereof, and the heat-insulating composite material has lower heat conductivity coefficient and excellent mechanical property by limiting various raw materials, so that the market demand can be better met. In order to achieve the above object of the present invention, the following technical solutions are specifically adopted: The invention provides a heat-insulating composite material, which comprises the following raw materials in parts by weight: 40-60 parts of aluminum silicate ceramic fiber, 20-30 parts of aluminum oxide hollow spheres, 10-15 parts of nano silicon dioxide aerogel, 5-10 parts of silicon carbide whisker, 1-3 parts of silane coupling agent, 0.2-1 part of dispersing agent and 8-12 parts of aluminum dihydrogen phosphate solution. Preferably, the heat-insulating composite material comprises the following raw materials in parts by weight: 50 parts of aluminum silicate ceramic fiber, 25 parts of aluminum oxide hollow sphere, 12 parts of nano silicon dioxide aerogel, 8 parts of silicon carbide whisker, 2 parts of silane coupling agent, 0.8 part of dispersing agent and 10 parts of aluminum dihydrogen phosphate solution. Preferably, the concentration of the aluminum dihydrogen phosphate solution is 40% -60%. Preferably, the silane coupling agent is KH-560. Preferably, the dispersant is sodium polyacrylate. The second aspect of the invention provides a preparation method of the heat-insulating composite material, which comprises the following steps: (a) Dissolving a silane coupling agent in absolute ethyl alcohol, spraying the silane coupling agent on the surface of the dried alumina hollow sphere, and drying to obtain a pretreated alumina hollow sphere; (b) Uniformly mixing aluminum silicate ceramic fibers, pretreated aluminum oxide hollow spheres, nano silicon dioxide aerogel and silicon carbide whiskers, and then adding a dispersing agent and a aluminum hydrogen phosphate solution for wet mixing to obtain a mixture; (c) And carrying out compression molding on the mixture, sintering and cooling to obtain the heat-insulating composite material. Preferably, in the step (a), the drying temperature is 90-100 ℃ and the time is 2-3 hours. Preferably, in the step (c), the compression molding pressure is 8-12 mpa, and the time is 4-8 min. Preferably, in the step (C), the sintering temperature is 780-850 ℃ and the sintering time is 1.8-3 h. Compared with the prior art, the invention has the beneficial effects that at least: the heat-insulating composite material has low heat conductivity and excellent mechanical property by limiting various raw materials and/or dosage, particularly, the aluminum oxide hollow microspheres can form a closed pore structure, reduce the material density and improve the heat-insulating property, the nano silicon dioxide aerogel can fill micropores to form a nano pore network, block heat conduction and improve the heat-insulating property, and meanwhile, the aluminum silicate ceramic fiber is taken as a high-temperature resistant matrix to form chemical bonding with the hollow aluminum oxide microspheres, and the toughness of the silicon carbide whisker reinforced material is assisted to prevent cracking, so that the composite material has excellent heat-insulating property and mechanical property by the combined action of various raw materials, thereby better meeting market demands. Detailed Description Embodiments of the technical scheme of the present invention will be described in detail below with reference to the embodiments. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention. It is noted that u