Thermally conductive and insulating composite material and preparation method thereof

A technology of heat conduction insulation and composite materials, which is applied in the field of functional polymer materials, can solve the problems of influence of coating effect, waste of coating raw materials, low coating rate, etc., achieve real-time monitoring of process conditions, use simple equipment, improve packaging coverage effect

Active Publication Date: 2015-07-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This application uses one-time coating to prepare insulating and heat-conducting powder, the coating rate is low, and the insulating and heat-conducting powder is reacted in a high-pressure reactor with a pressure of 5-20 standard atmospheres, which has potential production risks and is not conducive to production The monitoring and adjustment during the reaction process cannot guarantee the best coating conditions, which will obviously affect the final coating effect. In addition, the liquid organometallic compound used in this method is more expensive than the metal inorganic compound.
[0008] The Chinese patent application CN201410048639 discloses a graphene-containing insulating and heat-dissipating composition and its preparation. The insulating and heat-dissipating composition is hydrolyzed on the surface of graphene by tetraethyl orthosilicate, and the heat preservation reaction at 50-70°C 1- 3 hours, the produced silicic acid is coated on the surface of graphene, and then dried at 120-150°C for 2-6 hours, and finally a silicon dioxide film is formed on the surface of graphene to complete the modification of graphene. It is also modified by one-time coating of graphene, the coating rate is low, resulting in waste of coating raw materials, and although silica itself has excellent insulation properties, its thermal conductivity is too low (1.5 W / mK) will obviously cause It affects the excellent thermal conductivity of graphene itself. Therefore, the prepared modified graphene also needs to be mixed with other insulating and thermally conductive fillers under the action of surface treatment agents and functional additives to form an insulating and thermally conductive composition synergistically.
This will obviously increase the process flow, the process is more complicated, it will also affect the production stability of the product, and increase the production cost
In addition, the cost of the selected raw material ethyl orthosilicate is relatively high, which is not conducive to reducing the production cost of the final product for industrial production.

Method used

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  • Thermally conductive and insulating composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0048] Get 15g of graphite and add it into water to make a suspension with a mass fraction of 0.03 g / ml, add anionic surfactant sodium lauryl sulfate that accounts for 3% of the mass fraction of graphite, ultrasonically disperse for half an hour, and then the suspension Place in an oil bath at a temperature of 70-90°C, and continue to stir for one hour to fully disperse the graphite in the aqueous solution.

[0049] Divide the aluminum nitrate solution containing 45g of aluminum nitrate into two parts, first slowly add one part of the aluminum nitrate solution to the suspension after the above treatment, and at the same time add NaOH solution dropwise to control the pH of the solution at about 6.5. After that, continue to stir at the temperature of 70-90°C for several hours until the reaction is complete, and centrifugally filter to obtain Al(OH) 3 Coat the graphite solid once, and after vacuum drying, add it to deionized water to form a suspension of 0.03g / ml, add anionic su...

Embodiment 5-8

[0059] Get 5g of graphite and add it into water to make a suspension with a mass fraction of 0.06g / ml, add anionic surfactant sodium hexadecanoate that accounts for 1.5% of the mass fraction of graphite, ultrasonically disperse for half an hour, and then place the suspension In an oil bath at a temperature of 70-90°C, continue to stir for one hour to fully disperse the graphite in the aqueous solution.

[0060] Divide the aluminum nitrate solution containing 20g of aluminum nitrate into two parts, first slowly add one part of the aluminum nitrate solution to the suspension after the above treatment, and at the same time add NaOH solution dropwise to control the pH of the solution to 5-7. After that, continue to stir at the temperature of 70-90°C for several hours until the reaction is complete, and centrifugally filter to obtain Al(OH) 3 Coat graphite solid once, after vacuum drying, add it into deionized water to make a suspension of 0.06g / ml, add anionic surfactant sodium h...

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Abstract

The invention discloses a thermally conductive and insulating composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 100 parts of a polymer matrix and 5-33 parts of a modified carbon-based filler, wherein the modified carbon-based filler is formed by conducting secondary coating modification on a carbon-based filler through an insulting metallic oxide. Through the secondary coating of the carbon-based filler, the coating rate of the carbon-based filler is improved, and thus a coating raw material can be utilized to the greatest extent; the composite material can keep high insulativity when the relatively high thermal conductivity of the composite material is ensured, so that the application range of the composite material is enlarged.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to a heat-conducting and insulating composite material and a preparation method thereof. Background technique [0002] Thermally conductive and insulating polymer materials are mainly composed of polymer insulating substrates and thermally conductive insulating fillers. According to the classification of the substrate, they can be roughly divided into: thermally conductive and insulating plastics, thermally conductive and insulating rubbers, thermally conductive and insulating adhesives, thermally conductive and insulating coatings, and others. [0003] At present, thermally conductive and insulating polymer materials can be mainly used in microelectronic packaging, motors, automobiles, special cables, high-end aerospace and other fields, and can replace traditional metals or metal alloys to manufacture heat exchangers, heat pipes, solar water heaters, and batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K9/10C08K3/04
Inventor 杨其唐大航曹燊钊
Owner SICHUAN UNIV
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