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Method of utilizing polydopamine modified aluminum nitride microspheres to prepare thermal radiation film

A technology of polydopamine and aluminum nitride, which is applied in the field of heat dissipation materials, can solve the problems of poor heat dissipation performance of heat dissipation film, achieve good thermal conductivity, strengthen heat exchange, and increase the direction of heat flow

Inactive Publication Date: 2019-05-31
徐扣华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a heat dissipation film by using polydopamine modified aluminum nitride microspheres in view of the defects of poor heat dissipation performance of the current heat dissipation film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Preparation of ground product:

[0029] In parts by weight, put 8 parts of aluminum chloride hexahydrate, 2 parts of cetyltrimethylammonium bromide, 26 parts of distilled water, 6 parts of absolute ethanol and 3 parts of formamide into the beaker, and place the beaker In the resistance heating mantle, put the magnetic ball into the beaker, mix and stir for 2h under the condition of rotation speed of 500r / min and temperature of 60℃ to prepare the mixture;

[0030] Add 10% propylene oxide of the mixed liquid mass to the above beaker, mix and stir for 3 minutes with a stirring device at a speed of 1200r / min. After stirring, let it stand for 20 minutes to prepare a reaction gel. Place the beaker in a vacuum drying oven. Dry for 3 hours under the conditions of a vacuum of 120MPa and a temperature of 70°C, and then put it into a grinder to grind through a 50-mesh sieve to obtain a dried product;

[0031] Put the above-mentioned dry product into a tube furnace, raise the temperature...

example 2

[0038] Preparation of ground product:

[0039] In parts by weight, put 9 parts of aluminum chloride hexahydrate, 3 parts of cetyltrimethylammonium bromide, 27 parts of distilled water, 7 parts of absolute ethanol and 4 parts of formamide into the beaker, and place the beaker In the resistance heating mantle, put the magnetic ball into the beaker, mix and stir for 2.5h under the conditions of speed of 550r / min and temperature of 65°C to prepare the mixture;

[0040] Add 14% propylene oxide of the mixed liquid mass to the above beaker, mix and stir for 4 minutes with a stirring device at a speed of 1250r / min. After stirring, let it stand for 25 minutes to prepare a reaction gel. Place the beaker in a vacuum drying oven. Dry for 3.5 hours under the conditions of a vacuum of 160MPa and a temperature of 75°C, and then put it into a grinder to grind through a 50-mesh sieve to obtain a dried product;

[0041] Put the above-mentioned dry product into a tube furnace, raise the temperature in...

example 3

[0048] Preparation of ground product:

[0049] In parts by weight, put 10 parts of aluminum chloride hexahydrate, 4 parts of cetyltrimethylammonium bromide, 28 parts of distilled water, 8 parts of absolute ethanol and 5 parts of formamide into the beaker, and place the beaker In the resistance heating mantle, put a magnetic ball into the beaker, mix and stir for 3 hours under the conditions of a rotation speed of 600r / min and a temperature of 70°C to prepare a mixture;

[0050] Add 16% propylene oxide of the mixed liquid mass to the above beaker, mix and stir for 5 minutes at a speed of 1300r / min with a stirring device, and let it stand for 30 minutes after stirring to obtain a reaction gel. Place the beaker in a vacuum drying oven. Dry for 4 hours under the conditions of a vacuum of 200 MPa and a temperature of 80 ℃, and then put it into a grinder and grind through a 50-mesh sieve to obtain a dried product;

[0051] Put the above-mentioned dry product into a tube furnace, raise the...

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Abstract

The invention relates to a method of utilizing polydopamine modified aluminum nitride microspheres to prepare a thermal radiation film and belongs to the technical field of thermal radiation materials. Aluminum nitride microspheres are prepared by utilizing aluminum chloride hexahydrate to react with epoxy propane and calcining at high temperature in an ammonia gas atmosphere after reaction, and aluminum nitride enables atom crystals to be of a tetrahedral structure, has good heat conducting performance itself and is prepared to be microspherical particles to be filled in a thermal radiation film structure, so that thermal radiation ability of the thermal radiation film is further improved. A polydopamine film is grafted on the aluminum nitride microspheres to modify the surfaces of the same, bonding strength between the aluminum nitride microspheres and other molecules in the thermal radiation film is improved, groups in an organic compound are utilized to generate chemical bonding force to improve mechanical strength of the thermal radiation film, and toughness of the thermal radiation film is improved.

Description

Technical field [0001] The invention relates to a method for preparing a heat dissipation film using polydopamine modified aluminum nitride microspheres, and belongs to the technical field of heat dissipation materials. Background technique [0002] The heat dissipation film is a thermally conductive and heat-dissipating film used on mobile phones, tablet computers, etc. The industry is roughly divided into four types: natural graphite, artificial graphite, graphene and carbon nanotube heat dissipation film. The price of natural graphite powder is very cheap, but the heat dissipation effect is not very good. Graphene has the best heat dissipation effect, but the price is too expensive, often thousands of dollars. Artificial graphite and carbon nanotube heat dissipation film have similar heat dissipation effects, but carbon nanotubes have more advantages in price and higher cost performance. [0003] The heat dissipation film is a brand-new thermal and heat dissipation material w...

Claims

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Application Information

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IPC IPC(8): C08J9/24C08J5/18C08L79/04C08G73/06
Inventor 徐扣华
Owner 徐扣华
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