Dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material and preparation method thereof

A technology of hexagonal boron nitride and para-aramid fibers, which is applied in the field of dopamine-modified hexagonal boron nitride/para-aramid fiber nanofiber composite materials and its preparation, can solve the problem of no good combination, easy scattering, and limited composite materials Thermal conductivity and other issues to achieve the effect of improving thermal conductivity, excellent insulation and thermal conductivity, and improving interface bonding

Inactive Publication Date: 2019-09-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the surface of the inorganic material hexagonal boron nitride is inert, there is no good combination with the interface of the polymer-based material, and the heat transfer is poor, which makes it easy to scatter during the actual heat transfer process, thus limiting the thermal conductivity of its composite material

Method used

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  • Dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material and preparation method thereof
  • Dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material and preparation method thereof
  • Dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material and preparation method thereof

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preparation example Construction

[0044] A preparation method of a dopamine-modified hexagonal boron nitride / para-aramid nanofiber composite material of the present invention comprises the following steps,

[0045] Step 1, the dopamine-modified hexagonal boron nitride dispersion and the para-aramid nanofiber dispersion are thoroughly mixed after ultrasound to obtain a mixed system A, wherein the quality of the dopamine-modified hexagonal boron nitride is and 10% to 40% of the total mass of para-aramid nanofibers, and the ultrasonic time is 10 to 30 minutes, depending on the quality of hexagonal boron nitride, because hexagonal boron nitride is naturally formed and artificially synthesized, and the final product different scales;

[0046] Step 2, the mixed system A is sequentially subjected to vacuum-assisted filtration and hot-press drying to obtain dopamine-modified hexagonal boron nitride / para-aramid fiber nanofiber composite material, wherein the vacuum-assisted filtration pressure is 0.5-0.8MPa, and hot-pr...

Embodiment 1

[0060] A preparation method of a dopamine-modified hexagonal boron nitride / para-aramid nanofiber composite material of the present invention comprises the following steps,

[0061] Step 1, the dopamine-modified hexagonal boron nitride dispersion and the para-aramid nanofiber dispersion are thoroughly mixed after ultrasound to obtain a mixed system A, wherein the quality of the dopamine-modified hexagonal boron nitride is and 10% of the total mass of para-aramid nanofibers, the ultrasonic time is 10 minutes;

[0062] Step 2, the mixed system A is subjected to vacuum-assisted filtration and hot-press drying in sequence to obtain the dopamine-modified hexagonal boron nitride / para-aramid nanofiber composite material, wherein the vacuum-assisted filtration pressure is 0.5MPa, and hot-press drying is performed at 90 15 min at °C.

[0063] In the above step 1, the dopamine-modified hexagonal boron nitride dispersion is prepared as follows,

[0064] Step 1-1a, mix deionized water an...

Embodiment 2

[0076] A preparation method of a dopamine-modified hexagonal boron nitride / para-aramid nanofiber composite material of the present invention comprises the following steps,

[0077] Step 1, the dopamine-modified hexagonal boron nitride dispersion and the para-aramid nanofiber dispersion are thoroughly mixed after ultrasound to obtain a mixed system A, wherein the quality of the dopamine-modified hexagonal boron nitride is and 20% of the total mass of para-aramid nanofibers, the ultrasonic time is 20min;

[0078] Step 2, the mixed system A is sequentially subjected to vacuum-assisted filtration and hot-press drying to obtain a dopamine-modified hexagonal boron nitride / para-aramid nanofiber composite material, wherein the vacuum-assisted filtration pressure is 0.6 MPa, and hot-press drying is performed at 120 ℃ for 20min.

[0079] In the above step 1, the dopamine-modified hexagonal boron nitride dispersion is prepared as follows,

[0080] Step 1-1a, mixing deionized water and ...

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Abstract

The invention relates to a dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material and a preparation method thereof. The method includes: step 1, mixing a dopamine modifiedhexagonal boron nitride dispersion solution and a para-aramid nanofiber dispersion solution, and then performing ultrasonic treatment to obtain a mixed system A, wherein the mass of the dopamine modified hexagonal boron nitride accounts for 10%-40% of the total mass of the para-aramid nanofiber; and step 2, conducting vacuum-assisted filtration and hot press drying on the mixed system A to obtainthe dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material. The method ensures the formation of certain microstructure in the composite material, and then enhances the insulation properties of the composite material, and improves the interfacial binding capacity of the dopamine modified hexagonal boron nitride and para-aramid nanofiber, strengthens the stress transfer between the two materials while guaranteeing good heat conduction, strengthens the mechanical strength of the composite material, and acquires the composite material with excellent insulating performance and heat-conducting properties.

Description

technical field [0001] The invention belongs to the intersection field of electrical insulation and papermaking technology, and specifically relates to a dopamine-modified hexagonal boron nitride / para-aramid nanofiber composite material and a preparation method thereof. Background technique [0002] With the development of high voltage, light weight and integration of power equipment, the requirements of power equipment for insulating materials have gradually become more stringent. Therefore, research and development of a material for electrical equipment insulation with excellent insulating properties and thermal conductivity has become a hot and difficult point in the electrical industry. [0003] Para-aramid fiber-based insulating materials are widely used in power equipment such as generators and transformers due to their excellent compressive strength, mechanical strength and thermal stability. With the advancement of nanotechnology, the simple molding technology of pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/10C08K9/04C08K3/38C08J3/215C09K5/14
CPCC08J3/215C08J2377/10C08K9/08C08K2003/385C09K5/14
Inventor 陆赵情贾峰峰谢璠司联蒙鲍晶晶王丹妮金崭凡姚成
Owner SHAANXI UNIV OF SCI & TECH
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