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High-thermal-conductivity boron nitride/natural rubber composite and preparation method thereof

A natural rubber and composite material technology, applied in the field of polymers, can solve the problems of harsh preparation conditions, complicated preparation process, and decreased elongation at break, and achieve improved dispersion performance, low dielectric constant, thermal conductivity, and mechanical properties. Effect

Inactive Publication Date: 2019-02-26
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation conditions of rubber composite materials are harsh, the preparation process is complicated, and the elongation at break decreases significantly (<10%)

Method used

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  • High-thermal-conductivity boron nitride/natural rubber composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 2.8g of catechol and 1.6g of tetra(ethylenediyl)pentamine to 100ml of deionized water, adjust the pH of the aqueous solution to 8 with tris (Tris), then add 50g of nitrogen boron, at room temperature, the reaction was stirred at a stirring rate of 400r / min for 6h.

[0024] (2) Raise the temperature of the water bath to 70°C, add 0.5g of silane coupling agent KH560, stir at a stirring speed of 400r / min for 5h, wash with deionized water to neutral after the reaction stops, filter with suction, and dry in vacuum to obtain modification Boron nitride nanosheets.

[0025] (3) 100 parts by mass of natural rubber is plasticized at room temperature on an open mill, and 50 parts by mass of modified boron nitride nanosheets prepared by step (2) are gradually added to the natural rubber, and then 3 parts by mass of sulfur are gradually added, Knead with a knife and pack into triangles to make it evenly mixed.

[0026] (4) After kneading and parking for 24 hours, set a pre...

Embodiment 2

[0029] The preparation method is the same as in Example 1, except that the amount of modified boron nitride nanosheets is 200 parts by mass. The test results are shown in Table 1.

Embodiment 3

[0031] The preparation method is the same as in Example 1, except that the tetra(ethylenediyl)pentamine in the modifier is changed to pentaerythramine, and the test results are shown in Table 1.

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Abstract

The invention discloses a high-thermal-conductivity boron nitride / natural rubber composite and a preparation method thereof. The composite comprises a natural rubber matrix, a valcanizer and a modified boron nitride nanosheet, wherein the boron nitride nanosheet is modified by the following steps: performing self-polymerization of pyrocatechol and polyamine on the surface of the boron nitride nanosheet to form a poly(pyrocatechol / polyamine) (PCPA) layer, and allowing pyrocatechol groups and amino groups on the surface of PCPA to react with functional groups on a silane coupling agent to achieve secondary functionalization of the surface of the nanosheet so as to form the modified boron nitride nanosheet. The rubber composite with a high heat conduction coefficient and excellent mechanicalproperties is prepared by adding the modified boron nitride nanosheet into the natural rubber matrix. The method is high in efficiency, low in cost, mild in reaction conditions and easy and simple tooperate, effectively improves the heat conduction property and mechanical properties of natural rubber and can be widely applied to the field of electronic packaging.

Description

technical field [0001] The invention belongs to the technical field of polymers, and in particular relates to a high thermal conductivity boron nitride / natural rubber composite material and a preparation method thereof. Background technique [0002] With the rapid development of high-tech fields such as aviation, aerospace, electronics, medical and health, the requirements for the service life and thermal stability of rubber parts are getting higher and higher, and the thermal conductivity of rubber is getting more and more attention. Among the many rubber matrix materials, natural rubber has attracted extensive attention of researchers because of its good insulation, air tightness, high tensile strength and elongation at break, and its wide source. However, natural rubber is a poor conductor of heat, so it is often necessary to prepare thermally conductive composite materials by filling thermally conductive fillers to improve the thermal conductivity of rubber. The commonl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08K9/04C08K9/06C08K7/00C08K3/38
CPCC08K3/38C08K7/00C08K9/04C08K9/06C08K2003/385C08K2201/011C08L7/00
Inventor 杨丹王岩倪宇峰孔欣欣徐英杰朱洋洋郭文莉
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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