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A kind of core-shell structure silver-based thermally conductive rubber composite material and preparation method thereof

A technology of core-shell structure and heat-conducting rubber, applied in the field of polymers, can solve the problems of complex reaction steps, uneconomical and environmental protection, and affecting performance, and achieve the effects of reducing the amount of silver, good dispersion, and low cost

Active Publication Date: 2020-08-18
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 201711258571.5) proposes to plate silver particles on the surface of alumina by electroless plating, and then mix it with liquid silicone rubber to prepare a thermally conductive silicone rubber composite material. The thermally conductive silicone rubber composite material can be greatly improved at the same cost The thermal conductivity of the material, but the prepared nano-silver coated alumina needs to be sensitized and activated to the alumina, the reaction steps are complicated, and the use of strong acid will damage the matrix material and affect its performance, which is not economical and environmentally friendly

Method used

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  • A kind of core-shell structure silver-based thermally conductive rubber composite material and preparation method thereof
  • A kind of core-shell structure silver-based thermally conductive rubber composite material and preparation method thereof
  • A kind of core-shell structure silver-based thermally conductive rubber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take 100ml of configured dopamine aqueous solution with a mass fraction of 2g / L, and adjust the aqueous solution to pH 8.5 with Tris (Tris), then add 6g of boron nitride particles with a particle size of 1 μm, Under room temperature, the reaction was stirred at a stirring rate of 60 rpm for 18 hours. After the reaction, suction filtration, deionized water washing, and vacuum drying were performed to obtain polydopamine-coated boron nitride heat-conducting particles.

[0029] (2) Configure a silver nitrate solution with a concentration of 10 g / L, titrate with ammonia water until the precipitate just disappears, and obtain a silver plating solution.

[0030] (3) Soak the polydopamine-coated boron nitride heat-conducting particles in step (1) in the 200ml silver plating solution obtained in step (2) under stirring conditions, and add an equal volume concentration of 20g / L glucose solution, Stir mechanically for 1 h at room temperature, vacuum filter, wash with deionize...

Embodiment 2

[0036] The preparation method is the same as in Example 1, except that the amount of core-shell structure silver-based thermally conductive boron nitride is 100 parts by mass. The test results are shown in Table 1.

Embodiment 3

[0038] The preparation method is the same as in Example 1, except that the particle size of boron nitride is 3 μm. The test results are shown in Table 1.

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Abstract

The invention relates to a core-shell-structured silver-based heat-conductive rubber composite material and a preparation method thereof. The composite material comprises a rubber matrix, a vulcanizerand core-shell-structured silver-based heat-conductive filler. The core-shell-structured silver-based heat-conductive filler is prepared through subjecting dopamine to self-polymerization on the surface of high-heat-conductivity inorganic filler so as to form a polydopamine functional layer, putting the heat-conductive filler, of which the surface is coated with a polydopamine layer, into a silver plating solution, adding a reducer glucose solution, and depositing and coating the surface of the high-heat-conductivity inorganic filler with silver nanoparticles by an in-situ chemical reductionmethod. The rubber composite material with high coefficient of thermal conductivity and low dielectric constant is prepared through adding the core-shell-structured silver-based heat-conductive fillerinto the rubber matrix. The composite material is excellent in heat-conducting property and can be applied to electronic packaging materials. The preparation method is simple, convenient, effective and controllable in operation and is economical and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of polymers, and in particular relates to a silver-based heat-conducting rubber composite material with a core-shell structure and a preparation method thereof. Background technique [0002] With the development of microelectronics technology, electronic components are rapidly developing towards miniaturization and multi-function, the assembly density of components is getting higher and higher, and the unit calorific value is rising rapidly. The electronics industry urgently needs materials with high thermal conductivity and low dielectric constant. Polymer materials have light weight, good processing performance, good electrical insulation performance, low cost, and can be mass-produced, so they are good choices for preparing heat-conducting materials. However, polymers are poor conductors of heat, and the conditions for constructing structural thermally conductive polymers are extremely harsh, making it di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08L83/04C08K13/06C08K9/10C08K9/02C08K3/38C08K3/22C08K3/28
CPCC08K3/22C08K3/28C08K3/38C08K9/02C08K9/10C08K13/06C08K2003/2227C08K2003/282C08K2003/385C08K2201/003C08L7/00C08L83/04
Inventor 杨丹梁亚飞李炳瑶马浩男孔欣欣倪宇峰李树新伍一波
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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