Aluminum powder surface modification method

An aluminum powder and modification technology, applied in metal processing equipment, transportation and packaging, etc., can solve problems such as weak interface interaction, and achieve the effects of reduced agglomeration, high reliability and large contact area.

Inactive Publication Date: 2021-04-27
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since aluminum powder is an inorganic filler, the interface with the polymer is weak

Method used

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  • Aluminum powder surface modification method
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  • Aluminum powder surface modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of silane coupling agent-modified aluminum powder with aluminum powder particle size of 1-2 μm: 1) Prepare a mixed solution with octyltrimethoxysilane, deionized water and absolute ethanol at a mass ratio of 1:1:3 ;

[0031] 2) Add the mixed solution in 1) into a three-necked flask, then add aluminum powder with a particle size of 1-2 μm (the mass fraction of aluminum powder in the mixed solution is 40%), condense and reflux, and continue to stir at 75 ° C for 5 The silane coupling agent-modified aluminum powder is obtained within 1 hour, and the silane coupling agent-modified aluminum powder is centrifuged, washed, and vacuum-dried for later use.

[0032] Preparation of silane coupling agent-modified aluminum powder with aluminum powder particle size of 13-15 μm: 1) Prepare a mixed solution with octyltrimethoxysilane, deionized water and absolute ethanol at a mass ratio of 1:1:3 ;

[0033] 2) Add the mixed solution in 1) into a three-necked flask, then ad...

Embodiment 2

[0038] Preparation of silane coupling agent-modified aluminum powder with a particle size of 1-2 μm: 1) Prepare a mixed solution of decyltrimethoxysilane, deionized water and absolute ethanol at a mass ratio of 1:1:3 ;

[0039] 2) Add the mixed solution in 1) into a three-necked flask, then add aluminum powder with a particle size of 1-2 μm (the mass fraction of aluminum powder in the mixed solution is 40%), condense and reflux, and continue to stir at 75 ° C for 5 The silane coupling agent-modified aluminum powder is obtained within 1 hour, and the silane coupling agent-modified aluminum powder is centrifuged, washed, and vacuum-dried for later use.

[0040] Preparation of silane coupling agent-modified aluminum powder with an aluminum powder particle size of 13-15 μm: 1) Prepare a mixed solution of decyltrimethoxysilane, deionized water and absolute ethanol at a mass ratio of 1:1:3 ;

[0041] 2) Add the mixed solution in 1) into a three-necked flask, then add aluminum powd...

Embodiment 3

[0046] Preparation of silane coupling agent-modified aluminum powder with aluminum powder particle size of 1-2 μm: 1) Prepare dodecyltrimethoxysilane, deionized water and absolute ethanol in a mass ratio of 1:1:3 mixture;

[0047] 2) Add the mixed solution in 1) into a three-necked flask, then add aluminum powder with a particle size of 1-2 μm (the mass fraction of aluminum powder in the mixed solution is 40%), condense and reflux, and continue to stir at 75 ° C for 5 The silane coupling agent-modified aluminum powder is obtained within 1 hour, and the silane coupling agent-modified aluminum powder is centrifuged, washed, and vacuum-dried for later use.

[0048] Preparation of silane coupling agent-modified aluminum powder with aluminum powder particle size of 13-15 μm: 1) Dodecyltrimethoxysilane, deionized water and absolute ethanol are prepared in a mass ratio of 1:1:3 mixture;

[0049] 2) Add the mixed solution in 1) into a three-necked flask, then add aluminum powder wit...

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Abstract

The invention discloses an aluminum powder surface modification method. The aluminum powder surface modification method comprises the following steps of preparing a silane coupling agent, deionized water and absolute ethyl alcohol into a mixed solution according to a certain proportion; and adding the mixed solution into a reaction container, then adding aluminum powder, condensing and refluxing, and continuously stirring at 70-80 DEG C for 4-5 hours to obtain silane coupling agent modified aluminum powder. According to the aluminum powder surface modification method, the aluminum powder surface treatment method is a chemical treatment method, the silane coupling agent is grafted to a aluminum powder surface in a chemical bond mode, the polarity of the aluminum powder surface is remarkably reduced, agglomeration of the aluminum powder surface in a polymer substrate is effectively reduced, dispersity is better, and the contact area between the aluminum powder surface and the polymer substrate becomes larger; when modified aluminum powder is used in heat-conducting gel, the interfacial strength between the modified aluminum powder and the polymer substrate is higher; compared with unmodified aluminum powder, the modified aluminum powder has better compatibility with a polymer, so that the heat-conducting gel prepared from the modified aluminum powder has better mechanical properties under the same filler fraction.

Description

technical field [0001] The invention belongs to the technical field of thermal interface materials and relates to a method for modifying the surface of aluminum powder. Background technique [0002] Due to the excellent physical properties of aluminum powder, such as low cost, easy acquisition, easy processing, and high thermal conductivity, aluminum powder is widely used as a filler in the industrial production of thermal interface materials. However, the surface polarity of aluminum powder is relatively large, and it is easy to agglomerate in the polymer substrate. The agglomeration of aluminum powder will reduce the contact area between it and the polymer, and reduce the filler-polymer interface area, making it difficult to fully utilize the aluminum powder. Filling for reinforcement and functionality. The dispersion of aluminum powder and the interface strength between aluminum powder and polymer are two important factors affecting the performance of thermally conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
CPCB22F1/102B22F1/145
Inventor 任琳琳马强强孙蓉曾小亮庞云嵩许永伦许建斌
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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