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Graphene-coated oxide heat conduction filler and preparation method thereof

A graphene-coated, thermally conductive filler technology, applied in chemical instruments and methods, fibrous fillers, heat exchange materials, etc., can solve problems such as difficult large-scale implementation, high cost, and complicated operation, and achieve environmental friendliness and low cost. The effect of low cost and simple preparation process

Active Publication Date: 2017-05-24
上海烯古能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correspondingly, some researchers have attempted to modify graphene on inorganic thermally conductive fillers, but it often requires complex chemical surface modification of both graphene and inorganic thermally conductive fillers, which is complicated to operate and expensive to implement on a large scale.

Method used

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  • Graphene-coated oxide heat conduction filler and preparation method thereof
  • Graphene-coated oxide heat conduction filler and preparation method thereof
  • Graphene-coated oxide heat conduction filler and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1 The preparation method of graphene-coated alumina thermally conductive filler comprises:

[0038] (a) at room temperature, the weight average molecular weight of 2.0g is 8×10 3 Sodium polyacrylate dispersed in 2.8L deionized water at high speed to obtain a sodium polyacrylate dispersion with a concentration of 1.0wt%;

[0039] (b) Add 200.0 g of alumina powder to the above sodium polyacrylate dispersion at room temperature, wherein the particle size of alumina is in the range of 0.2-50 μm. Then carry out mechanical stirring with the rotating speed of 7000r / min 20min;

[0040] (c) Add 40.0 g of purchased graphene with a sheet diameter of 5 μm to 30 μm and a thickness of ≤10 nm to the above system, and sonicate for 30 minutes;

[0041] (d) After mechanically stirring the above system for 20 minutes, let it stand, skim off the supernatant, perform suction filtration, wash with deionized water and ethanol several times, and dry it in a vacuum oven at 60°C for...

Embodiment 2

[0044] Embodiment 2 The preparation method of the graphene-coated magnesium oxide thermally conductive filler comprises:

[0045] (a) 2.0g weight average molecular weight is 3×10 at room temperature 7 Sodium polyacrylate dispersed in 2.8L deionized water at high speed to obtain 0.3wt% potassium polyacrylate dispersion;

[0046] (b) Add 200.0 g of magnesium oxide powder to the above potassium polyacrylate dispersion at room temperature, wherein the particle size of the magnesium oxide is 0.2-10 μm. Then carry out mechanical stirring with the rotating speed of 7000r / min 20min;

[0047] (c) Add 10.0 g of purchased graphene with a sheet diameter of 5 μm to 30 μm and a thickness of ≤10 nm to the above system, and sonicate for 30 minutes;

[0048](d) After stirring the above system mechanically for 20 minutes, let it stand still. After skimming the supernatant, perform suction filtration, wash with deionized water and ethanol several times, and then dry in a vacuum oven at 40°C f...

Embodiment 3

[0050] Embodiment 3 The preparation method of the graphene-coated alumina / zinc oxide composite thermally conductive filler comprises:

[0051] (a) 2.0g weight average molecular weight is 4×10 at room temperature 6 Sodium polyacrylate dispersed in 2.8L deionized water at high speed to obtain 0.7wt% sodium polyacrylate dispersion;

[0052] (b) Add 200.0g of composite powder to the above sodium polyacrylate dispersion at room temperature (the particle sizes of aluminum oxide and zinc oxide are 0.2-50 μm and 0.2-10 μm respectively, and the mass ratio of the two is 1:1) , mechanically stirred at a speed of 7000r / min for 20min;

[0053] (c) Add 20.0 g of self-made graphene with a sheet diameter of 5 μm to 30 μm and a thickness of ≤10 nm to the above system, and sonicate for 30 minutes;

[0054] (d) After stirring the above system mechanically for 20 minutes, let it stand still. After skimming the supernatant, perform suction filtration, wash with deionized water and ethanol for s...

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Abstract

The invention discloses a graphene-coated oxide heat conduction filler and a preparation method thereof. The graphene-coated oxide heat conduction filler is prepared by compounding oxide, graphene and polyacrylate. The preparation method of the graphene-coated oxide heat conduction filler comprises the following steps of dissolving the polyacrylate into a solvent at room temperature, and forming a polyacrylate solution; adding the oxide into the polyacrylate solution at room temperature to form a first mixture; uniformly dispersing the graphene into the first mixture to form a second mixture; separating solid matter from the second mixture, and performing post-treatment, so as to obtain the graphene-coated oxide heat conduction filler. The graphene-coated oxide heat conduction filler has the advantages that the heat conduction coefficient is high, and the like; the graphene-coated oxide heat conduction filler is suitable for multiple types of macromolecular polymers; the preparation technology is simple, the operability is strong, the sources of raw materials are wide, the environment-friendly effect is realized, and the cost is low.

Description

technical field [0001] The invention particularly relates to a graphene-coated oxide thermally conductive filler and a preparation method thereof, belonging to the technical field of thermal interface materials. Background technique [0002] With the improvement of the performance of electronic products and the wide application of high-power electrical and electronic products, higher requirements are put forward for thermal management under high-integration assembly. At present, the simplest and most effective way to produce thermally conductive materials is to fill the body with highly thermally conductive inorganic compounds or metal fillers, thereby improving the thermal conductivity of the material. [0003] Among all kinds of thermally conductive fillers, although nitrides and carbides have high thermal conductivity, they have disadvantages such as high price and unstable properties, and the viscosity of the system will increase during a large amount of filling process,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/44C09C3/06C09C3/10C09K5/14
CPCC09C1/44C09C3/006C09C3/06C09C3/10C09K5/14
Inventor 李秋丽张凌蒋建忠张明杰
Owner 上海烯古能源科技有限公司