CN115558241A - High-thermal-conductivity carbon fiber fabric composite material and preparation method thereof - Google Patents
High-thermal-conductivity carbon fiber fabric composite material and preparation method thereof Download PDFInfo
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- CN115558241A CN115558241A CN202211265242.4A CN202211265242A CN115558241A CN 115558241 A CN115558241 A CN 115558241A CN 202211265242 A CN202211265242 A CN 202211265242A CN 115558241 A CN115558241 A CN 115558241A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 161
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 161
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000004744 fabric Substances 0.000 title claims abstract description 78
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 26
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 229920000642 polymer Polymers 0.000 claims abstract description 18
- 239000011159 matrix material Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 39
- 238000001723 curing Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000011302 mesophase pitch Substances 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004643 cyanate ester Substances 0.000 claims description 3
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- VYKXQOYUCMREIS-UHFFFAOYSA-N methylhexahydrophthalic anhydride Chemical compound C1CCCC2C(=O)OC(=O)C21C VYKXQOYUCMREIS-UHFFFAOYSA-N 0.000 claims description 3
- 229920003192 poly(bis maleimide) Polymers 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 238000000967 suction filtration Methods 0.000 claims description 3
- 238000010907 mechanical stirring Methods 0.000 abstract description 5
- 238000003828 vacuum filtration Methods 0.000 abstract description 4
- 238000002513 implantation Methods 0.000 abstract description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08L79/085—Unsaturated polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
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Abstract
A high-thermal-conductivity carbon fiber fabric composite material and a preparation method thereof are disclosed, and the composite material comprises the following raw materials in percentage by mass: 35-60% of carbon fiber fabric, 10-45% of polymer matrix, 5-35% of heat-conducting chopped carbon fiber, 5-40% of curing agent and 5-15% of film-forming agent. The invention leads the heat-conducting short carbon fiber to be evenly and stably dispersed in the polyvinyl alcohol solution by mechanical stirring. The heat-conducting chopped carbon fiber solution is placed in a magnetic field, and is rotated in the magnetic field due to the Langchant diamagnetism, the heat-conducting chopped carbon fiber solution is converted from a high energy state to a low energy state until the axis of the heat-conducting chopped carbon fiber is parallel to the direction of the external magnetic field, the energy reaches the lowest state, and the heat-conducting chopped carbon fiber is directionally arranged in the polyvinyl alcohol solution; the heat-conducting chopped carbon fibers are vertically implanted into the carbon fiber fabric through vacuum filtration, the axial high-heat-conductivity characteristic of the heat-conducting chopped carbon fibers is fully utilized, and the heat-conducting chopped carbon fibers are vertically and directionally arranged through implantation, so that the heat-conducting performance of the carbon fiber fabric composite material in the thickness direction is improved.
Description
Technical Field
The invention relates to the field of heat-conducting composite materials, in particular to a high-heat-conducting carbon fiber fabric composite material and a preparation method thereof.
Background
As the density of electronic devices increases, the heat generated by electronic equipment builds up rapidly. In order to ensure reliable operation of an electronic device for a long period of time, it is necessary to prevent the operating temperature of the device from rising, and therefore, the heat dissipation capability becomes an important factor affecting the service life of the electronic device.
The carbon fiber fabric composite material has the advantages of high strength, low density and the like, and is widely applied. However, the carbon fiber fabric composite material has poor heat conductivity in the thickness direction, so that the preparation of the high-heat-conductivity carbon fiber fabric composite material with excellent comprehensive performance becomes a research hotspot in the field in order to meet the development requirements of various manufacturing industries and high-tech fields of electronics, aerospace, military equipment and the like, and is receiving more and more attention.
At present, the research on the high-thermal-conductivity carbon fiber fabric composite materials at home and abroad focuses on filling high-thermal-conductivity particles, and the fillers mainly adopted are copper, diamond, graphene, carbon fibers, aluminum oxide and the like. However, the prior art does not solve the problem of ordering of fillers, has poor heat conduction performance in the thickness direction, and has heat conductivity of only 0.7 to 1W/(m.K). Thermally conductive chopped carbon fiber (mesophase pitch-based carbon fiber) as a fiber consisting of carbon atoms in sp 2 The carbon material with the hexagonal honeycomb lattice structure formed by the hybrid tracks has high orientation degree and excellent heat conduction performance, the axial heat conductivity reaches 900W/(m.K), and the carbon material is common heat conductionTens of times the material. However, thermally conductive chopped carbon fibers have high axial thermal conductivity and low radial thermal conductivity. Therefore, the heat-conducting chopped carbon fibers vertically and directionally arranged in the carbon fiber fabric are expected to remarkably improve the heat-conducting performance of the carbon fiber fabric composite material in the thickness direction.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a high-thermal-conductivity carbon fiber fabric composite material and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-thermal-conductivity carbon fiber fabric composite material comprises, by mass, 35% -60% of carbon fiber fabrics, 10% -45% of a polymer matrix, 5% -35% of thermal-conductivity chopped carbon fibers, 5% -40% of a curing agent and 5% -15% of a film forming agent.
The carbon fiber fabric is high-strength carbon fiber and has a thickness of 0.2-1 mm.
The polymer matrix is at least one of epoxy resin, bismaleimide resin, cyanate ester resin and silicon rubber.
The heat-conducting short carbon fibers are mesophase pitch-based carbon fibers, the diameter of the mesophase pitch-based carbon fibers can be 5-10 microns, and the length of the mesophase pitch-based carbon fibers can be 25-200 microns.
The film former may be selected from polyvinyl alcohol and glycerol.
The curing agent can be at least one selected from dicyandiamide, methylhexahydrophthalic anhydride and hydrogen-containing silicone oil.
The preparation method of the high-thermal-conductivity carbon fiber fabric composite material comprises the following steps:
1) Adding polyvinyl alcohol into deionized water, stirring and heating to obtain a polyvinyl alcohol solution.
2) Adding the heat-conducting short carbon fibers into a polyvinyl alcohol solution, dropwise adding glycerol, mechanically stirring, and performing ultrasonic dispersion to obtain a dispersion;
3) Placing the carbon fiber fabric on a vacuum pumping filter membrane, adding the heat-conducting short-cut carbon fiber dispersion liquid, and applying a magnetic field;
4) Starting a vacuum pump, pumping water in the dispersion liquid into a filter flask, arranging the heat-conducting short carbon fibers in order under the action of a magnetic field, and vertically implanting the heat-conducting short carbon fibers into the carbon fiber fabric by vacuum negative pressure;
5) And transferring the carbon fiber fabric mixture subjected to suction filtration to an electric heating constant temperature air blast drying oven, and heating, drying and curing.
6) And putting the cured carbon fiber fabric mixture into a mold, pouring a polymer and a curing agent, moving the mold to a vacuum oven, and heating and curing to obtain the high-thermal-conductivity carbon fiber fabric composite material.
In the step 3), the magnetic induction intensity of the external magnetic field is 0.1-1 Tesla, and the heat-conducting short carbon fibers need to be directionally arranged in the magnetic field.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1) According to the invention, the heat-conducting chopped carbon fibers are dispersed in the polyvinyl alcohol solution through mechanical stirring, can uniformly and stably exist in the polyvinyl alcohol solution, and do not need a dispersing agent.
2) The heat-conducting chopped carbon fiber solution is placed in a magnetic field, and is rotated in the magnetic field due to the Langchant diamagnetism, the heat-conducting chopped carbon fiber solution is converted from a high energy state to a low energy state until the axis of the heat-conducting chopped carbon fiber is parallel to the direction of the external magnetic field, the energy reaches the lowest state, and the heat-conducting chopped carbon fiber is directionally arranged in the polyvinyl alcohol solution; the heat-conducting chopped carbon fibers are vertically implanted into the carbon fiber fabric through vacuum filtration, the axial high-heat-conductivity characteristic of the heat-conducting chopped carbon fibers is fully utilized, and the heat-conducting chopped carbon fibers are vertically and directionally arranged through implantation, so that the heat-conducting performance of the carbon fiber fabric composite material in the thickness direction is improved.
3) The preparation method is simple and convenient and is easy to popularize.
Drawings
FIG. 1 is an optical microscope image of a carbon fiber fabric prepared in example 3 with vertically implanted directionally aligned thermally conductive chopped carbon fibers;
fig. 2 is a scanning electron microscope image of the cross section of the high thermal conductivity carbon fiber fabric composite material of example 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation method of a high-thermal-conductivity carbon fiber fabric composite material comprises 35-60% of carbon fiber fabric, wherein the carbon fiber fabric is high-strength carbon fiber and has the thickness of 0.2-1 mm; 5% -35% of heat-conducting chopped carbon fibers, wherein the diameter of each heat-conducting chopped carbon fiber is 5-10 mu m, and the length of each heat-conducting chopped carbon fiber is 25-200 nm;10% -45% of a polymer matrix, wherein the polymer matrix is at least one of epoxy resin, bismaleimide resin, cyanate ester resin and silicone rubber; 5 to 40 percent of curing agent, wherein the curing agent can be at least one of dicyandiamide, methylhexahydrophthalic anhydride and hydrogen-containing silicone oil; 5 to 15 percent of film forming agent, wherein the film forming agent can be selected from polyvinyl alcohol and glycerol, and a magnet (the magnetic induction intensity is 0.1 to 1 Tesla);
according to the materials in the ratio of the components by weight, firstly, dissolving polyvinyl alcohol by deionized water to obtain a polyvinyl alcohol solution, sequentially adding carbon fibers and glycerol into the polyvinyl alcohol solution, and carrying out mechanical stirring and ultrasonic dispersion. Secondly, placing the carbon fiber fabric on a filter membrane, applying a magnetic field, pouring a heat-conducting short carbon fiber solution, carrying out suction filtration, directionally arranging the heat-conducting short carbon fibers, vertically implanting the carbon fiber fabric, heating, drying and curing. And finally, compounding the cured carbon fiber fabric with a polymer matrix to obtain the high-thermal-conductivity carbon fiber fabric composite material. The high-thermal-conductivity carbon fiber fabric composite material adopts thermal-conductivity chopped carbon fibers as fillers, and can be prepared by adopting simple methods such as mechanical stirring and mixing, ultrasonic dispersion, magnetic field induced orientation, vacuum filtration and the like through a plurality of steps.
Specifically, the preparation process of the high thermal conductivity carbon fiber fabric composite material is as follows:
a. adding polyvinyl alcohol into deionized water, stirring and heating at 95 ℃ for 2 hours to obtain a polyvinyl alcohol solution;
b. adding the heat-conducting short-cut carbon fibers and glycerol into a polyvinyl alcohol solution, mechanically stirring, and ultrasonically dispersing;
c. placing the carbon fiber fabric on a vacuum pumping filter membrane, applying a magnetic field, pouring a heat-conducting short-cut carbon fiber solution, vacuumizing, and vertically implanting the heat-conducting short-cut carbon fiber into the carbon fiber fabric;
d. the carbon fiber fabric is moved into an electric heating constant temperature blast drying oven, heated, dried and cured;
e. and (3) placing the cured carbon fiber fabric in a mold, pouring a polymer matrix and a curing agent, transferring to a vacuum drying oven, and further heating and curing.
Specific examples are given below.
Example 1
A high-thermal-conductivity carbon fiber fabric composite material comprises 35% of carbon fiber fabric, 5% of thermal-conductivity chopped carbon fibers, 10% of polyvinyl alcohol, 5% of glycerol, 35% of polymer and 10% of curing agent. The diameter of the heat-conducting chopped carbon fiber is 10 mu m, and the length of the heat-conducting chopped carbon fiber is 200um. The prepared product was subjected to thermal conductivity test, and the results are shown in table 1.
Example 2
A high-thermal-conductivity carbon fiber fabric composite material comprises 60% of carbon fiber fabric, 5% of thermal-conductivity chopped carbon fibers, 5% of polyvinyl alcohol, 5% of glycerol, 20% of polymer and 5% of curing agent. The heat-conducting chopped carbon fibers have the diameter of 5 mu m and the length of 25 mu m. The prepared product was subjected to thermal conductivity test, and the results are shown in table 1.
Example 3
A high-thermal-conductivity carbon fiber fabric composite material comprises 40% of carbon fiber fabric, 35% of thermal-conductivity chopped carbon fibers, 5% of polyvinyl alcohol, 5% of glycerol, 10% of polymer and 5% of curing agent. The diameter of the heat-conducting chopped carbon fiber is 10 mu m, and the length of the heat-conducting chopped carbon fiber is 25um. The prepared product was subjected to thermal conductivity test, and the results are shown in table 1.
As shown in fig. 1 to 2, in the product prepared in example 3, the thermally conductive chopped carbon fibers were regularly arranged to be perpendicular to the upper and lower surfaces of the carbon fiber fabric.
Example 4
A high-thermal-conductivity carbon fiber fabric composite material comprises 35% of carbon fiber fabric, 5% of thermal-conductivity chopped carbon fibers, 5% of polyvinyl alcohol, 5% of glycerol, 45% of polymer and 5% of curing agent. The diameter of the heat-conducting chopped carbon fiber is 10 mu m, and the length of the heat-conducting chopped carbon fiber is 150um. The prepared product was subjected to thermal conductivity test, and the results are shown in table 1.
Example 5
A high-thermal-conductivity carbon fiber fabric composite material comprises 35% of carbon fiber fabric, 10% of thermal-conductivity chopped carbon fiber, 7.5% of polyvinyl alcohol, 7.5% of glycerol, 20% of polymer and 20% of curing agent. The heat-conducting chopped carbon fibers have the diameter of 5 mu m and the length of 200 mu m. The prepared product was subjected to thermal conductivity test, and the results are shown in table 1.
TABLE 1
| Examples | Carbon fiber Fabric content (Wt%) | Heat conductive chopped carbon fiber content (Wt%) | Thermal conductivity W/(m K) |
| 1 | 35% carbon fiber fabric | 5% heat-conducting chopped carbon fiber | 1.6 |
| 2 | 60% carbon fiber fabric | 5% heat-conducting chopped carbon fiber | 1.8 |
| 3 | 40% carbon fiber fabric | 35% heat-conducting chopped carbon fiber | 5.5 |
| 4 | 35% carbon fiber fabric | 5% heat-conducting chopped carbon fiber | 1.5 |
| 5 | 35% carbon fiber fabric | 10% heat conductive chopped carbon fiber | 2 |
According to the invention, the heat-conducting chopped carbon fibers and the glycerol are added into the PVA solution, and mechanical stirring and ultrasonic dispersion are carried out to obtain the heat-conducting chopped carbon fiber solution. And placing the carbon fiber fabric on a vacuum pumping membrane, applying a magnetic field, pouring a heat-conducting short carbon fiber solution, vacuumizing, and vertically implanting the heat-conducting short carbon fiber into the carbon fiber fabric. And putting the cured carbon fiber fabric mixture into a mold, pouring a polymer, moving the mold to a vacuum oven, and heating and curing to obtain the high-thermal-conductivity carbon fiber fabric composite material. The composite material adopts magnetic field to induce the orientation of the heat-conducting chopped carbon fibers, and the heat-conducting chopped carbon fibers are vertically implanted into the carbon fiber fabric by a vacuum filtration method, so that the high-heat-conducting carbon fiber fabric composite material can be prepared by simple steps.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The high-thermal-conductivity carbon fiber fabric composite material is characterized by comprising the following raw materials in percentage by mass: 35-60% of carbon fiber fabric, 10-45% of polymer matrix, 5-35% of heat-conducting chopped carbon fiber, 5-40% of curing agent and 5-15% of film-forming agent.
2. A highly thermally conductive carbon fiber fabric composite material as claimed in claim 1, wherein: the carbon fiber fabric is high-strength carbon fiber and has a thickness of 0.2-1 mm.
3. A high thermal conductivity carbon fiber fabric composite material as claimed in claim 1, wherein: the polymer matrix is at least one of epoxy resin, bismaleimide resin, cyanate ester resin and silicon rubber.
4. A high thermal conductivity carbon fiber fabric composite material as claimed in claim 1, wherein: the heat-conducting short carbon fibers are mesophase pitch-based carbon fibers, the diameter of the mesophase pitch-based carbon fibers can be 5-10 microns, and the length of the mesophase pitch-based carbon fibers can be 25-200 microns.
5. A highly thermally conductive carbon fiber fabric composite material as claimed in claim 1, wherein: the film forming agent comprises polyvinyl alcohol and glycerol.
6. A high thermal conductivity carbon fiber fabric composite material as claimed in claim 1, wherein: the curing agent can be at least one selected from dicyandiamide, methylhexahydrophthalic anhydride and hydrogen-containing silicone oil.
7. The method for preparing a high-thermal-conductivity carbon fiber fabric composite material as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
1) Adding polyvinyl alcohol into deionized water, stirring and heating to obtain a polyvinyl alcohol solution;
2) Adding the heat-conducting short carbon fibers into a polyvinyl alcohol solution, dropwise adding glycerol, mechanically stirring, and ultrasonically dispersing to obtain a heat-conducting short carbon fiber dispersion liquid;
3) Placing the carbon fiber fabric on a vacuum pumping filter membrane, adding the heat-conducting short-cut carbon fiber dispersion liquid, and applying a magnetic field;
4) Starting a vacuum pump, pumping water in the heat-conducting chopped carbon fiber dispersion liquid into a filter flask, arranging the heat-conducting chopped carbon fibers in an oriented manner under the action of a magnetic field, and vertically implanting the heat-conducting chopped carbon fibers into a carbon fiber fabric by vacuum negative pressure to obtain a carbon fiber fabric mixture;
5) Transferring the carbon fiber fabric mixture subjected to suction filtration to an electric heating constant-temperature air blast drying oven, and heating, drying and curing;
6) And putting the cured carbon fiber fabric mixture into a mold, pouring a polymer matrix and a curing agent, moving the polymer matrix and the curing agent to a vacuum oven, and heating and curing to obtain the high-thermal-conductivity carbon fiber fabric composite material.
8. The method of claim 7, wherein: in the step 3), the magnetic induction intensity of the external magnetic field is 0.1-1 Tesla.
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- 2022-10-17 CN CN202211265242.4A patent/CN115558241A/en active Pending
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| US20170137561A1 (en) * | 2014-05-09 | 2017-05-18 | Jnc Corporation | Composition for heat-dissipation members, heat-dissipation member, and electronic device |
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