Vertically arranged carbon fiber-polycarbonate heat-conducting composite material and preparation method thereof

A thermally conductive composite material, polycarbonate technology, applied in coatings, devices for coating liquids on surfaces, etc., can solve problems such as inability to have high thermal conductivity electronic devices, and achieve low equipment requirements, good product performance, and simple operation. Effect

Pending Publication Date: 2022-05-27

WUHAN UNIV OF SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

However, the current traditional thermally conductive composite materials cannot achieve high thermal conductivity in the ve...

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Abstract

The invention discloses a vertically arranged carbon fiber-polycarbonate heat conduction composite material. The preparation method comprises the following steps: taking mesophase pitch-based carbon fibers, graphitizing the mesophase pitch-based carbon fibers, and shearing the mesophase pitch-based carbon fibers to obtain a plurality of chopped carbon fibers; forming the plurality of chopped carbon fibers into a vertically arranged high-density carbon fiber array by using an electrostatic flocking method; the preparation method comprises the following steps: dissolving polycarbonate particles in tetrahydrofuran to form a mixed liquid; and pouring the mixed liquid into a vertically arranged high-density carbon fiber array, and carrying out vacuum liquid-phase impregnation, so as to obtain the vertically arranged carbon fiber-polycarbonate heat-conducting composite material after the polycarbonate is cured. According to the composite material, mesophase pitch-based carbon fibers are used as a heat-conducting filler, and the carbon fibers are vertically arranged in the composite material, so that the heat conductivity of the composite material in the vertical direction is greatly enhanced, and the product performance is good; the preparation method is simple to operate, short in preparation period and low in requirements on equipment.

Application Domain

Liquid surface applicatorsCoatings

Technology Topic

PolycarbonateFiber array +5

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Examples

Experimental program(6)

Example Embodiment

[0024] Example 1

[0025] Preparation of Vertically Aligned Carbon Fiber/Polycarbonate Composites:

[0026] Taking mesophase pitch-based carbon fibers and graphitizing them at 3000℃, high thermal conductivity carbon fibers were obtained, and their thermal conductivity was 900W·m -1 ·K -1. Weigh 0.5 g of the cut fiber, and the fiber length is 1 mm. The fibers were evenly distributed on the circular iron sheet through the screen, and the electric field distance was set to 6 cm.

[0027] Paste a layer of polyimide glue on the upper end of the electrostatic flocking instrument, place the metal disc with fibers on the lower end of the instrument, and close the hatch. Turn on the instrument, adjust the voltage of the electric field to 20KV, and the fibers are adsorbed on the polyimide glue under the action of the electric field, showing a state of vertical arrangement, repeating several times until the fibers are covered with the entire polyimide glue.

[0028] 5g of polycarbonate particles were dissolved in 20g of tetrahydrofuran to form a mixed solution with a certain viscosity, then the mixed resin was poured into the vertically arranged carbon fibers, put into a vacuum impregnation container, and the vacuum pump was turned on to form a vacuum environment in the container. The composite is prepared for molding when the polycarbonate is cured.

Example Embodiment

[0029] Example 2

[0030] The mesophase pitch-based carbon fiber was taken and graphitized at 3000 °C to obtain a high thermal conductivity carbon fiber with a thermal conductivity of 900 W m -1 •K -1. Weigh 0.5 g of the cut fiber, and the fiber length is 1 mm. The fibers were evenly distributed on the circular iron sheet through the screen, and the electric field distance was set to 9 cm.

[0031] Paste a layer of polyimide glue on the upper end of the electrostatic flocking instrument, place the metal disc with fibers on the lower end of the instrument, and close the hatch. Turn on the instrument, adjust the voltage of the electric field to 20KV, and the fibers are adsorbed on the polyimide glue under the action of the electric field, showing a state of vertical arrangement, repeating several times until the fibers are covered with the entire polyimide glue.

[0032] 5 g of polycarbonate particles were dissolved in 20 g of tetrahydrofuran to form a mixed liquid with a certain viscosity. Then, the mixed resin is poured into the vertically arranged carbon fibers, put into a vacuum impregnation container, and the vacuum pump is turned on to form a vacuum environment in the container. The composite is prepared for molding when the polycarbonate is cured.

Example Embodiment

[0033] Example 3

[0034] Taking mesophase pitch-based carbon fibers and graphitizing them at 3000℃, high thermal conductivity carbon fibers were obtained, and their thermal conductivity was 900W·m -1 ·K -1. Weigh 0.5 g of the cut fiber, and the fiber length is 1 mm. The fibers were evenly distributed on the circular iron sheet through the screen, and the electric field distance was set to 12 cm.

[0035] Paste a layer of polyimide glue on the upper end of the electrostatic flocking instrument, place the metal disc with fibers on the lower end of the instrument, and close the hatch. Turn on the instrument, adjust the voltage of the electric field to 20KV, and the fibers are adsorbed on the polyimide glue under the action of the electric field, showing a state of vertical arrangement, repeating several times until the fibers are covered with the entire polyimide glue.

[0036] 5 g of polycarbonate particles were dissolved in 20 g of tetrahydrofuran, and the polycarbonate particles were dissolved in tetrahydrofuran to form a mixed liquid with a certain viscosity. Then, the mixed resin is poured into the vertically arranged carbon fibers, put into a vacuum impregnation container, and the vacuum pump is turned on to form a vacuum environment in the container. The composite is prepared for molding when the polycarbonate is cured.

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PUM

Property	Measurement	Unit
Length	1.0	mm
Thermal conductivity	900.0	W/K/m
Length	2.0	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

High thermal conductivity
Good product performance

Power generation system using exhausting and cooling waste heat in internal combustion engine at the same time and control method therefor

InactiveCN102619641AHigh thermal conductivityReduce heat transfer area and volumeCoolant flow controlInternal combustion piston enginesDynamoHeating efficiency

Owner:BEIJING UNIV OF TECH

Recessed Light Apparatus

ActiveUS20160084488A1Effectively transmitHigh thermal conductivityPlanar light sourcesLighting support devicesEngineeringLight source

Owner:WU LIANGJU

Vertically arranged carbon fiber-polycarbonate heat-conducting composite material and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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