CN114213689B - Quasi-isotropy high-thermal-conductivity carbon fiber prepreg and preparation method and application thereof - Google Patents
Quasi-isotropy high-thermal-conductivity carbon fiber prepreg and preparation method and application thereof Download PDFInfo
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 114
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 114
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 31
- 229920002545 silicone oil Polymers 0.000 claims abstract description 26
- 239000011302 mesophase pitch Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 21
- 229910052796 boron Inorganic materials 0.000 claims description 18
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- 238000003763 carbonization Methods 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 8
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 8
- 229920000570 polyether Polymers 0.000 claims description 8
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 8
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 8
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 6
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- 238000002844 melting Methods 0.000 abstract description 2
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- 229910021641 deionized water Inorganic materials 0.000 abstract 1
- 239000004094 surface-active agent Substances 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 19
- 239000003795 chemical substances by application Substances 0.000 description 18
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- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
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- 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 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
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- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
Abstract
The invention belongs to the technical field of preparation of thermal management materials, and particularly discloses a quasi-isotropic high-thermal-conductivity carbon fiber prepreg and a preparation method and application thereof. Firstly, carrying out surface treatment on mesophase pitch-based carbon fibers carbonized at a low temperature of 400-600 ℃ to obtain mesophase pitch-based carbon fibers containing modified silicone oil, surfactant and deionized water, and then chopping the surface-modified mesophase pitch-based carbon fibers and preparing the surface density of 20-200 g/m 2 And then pressurizing, carbonizing and graphitizing the non-woven fabric to obtain the high-heat-conductivity carbon fiber non-woven fabric, and finally preparing the quasi-isotropy high-heat-conductivity carbon fiber prepreg by adopting a hot melting method, wherein the in-plane heat conductivity of the high-performance heat-conducting composite material prepared from the prepreg is 10-20W/m.K, and the Z-direction heat conductivity is more than 5W/m.K.
Description
Technical Field
The invention relates to the technical field of preparation of thermal management materials, in particular to a quasi-isotropic high-thermal-conductivity carbon fiber prepreg and a preparation method and application thereof.
Background
The high-performance heat-conducting material (CFRP) is one of the most potential heat-conducting materials used on spacecrafts, and uses anisotropic mesophase pitch-based carbon fibers as a reinforcement and a heat conduction carrier, and has the advantages of high heat conduction in the fiber direction (the heat conductivity can be more than 400W/m.K) and high modulus (the modulus in the fiber direction can be more than 400 GPa) besides the traditional CFRP light weight high-strength high-mode property. The CFRP reinforced by the high-heat-conductivity mesophase pitch-based carbon fiber is used on structural members of space aircrafts such as satellites, airships and the like, so that the temperature uniformity of the large-size members can be ensured, the dimensional stability of the structure is improved, the high-precision pointing of effective equipment loads is realized, and the attitude stability of the space aircrafts is maintained; the heat dissipation base material or the chassis body used for the electronic circuit board can effectively dissipate heat generated when the electronic components run, and ensures long-term stable running of the components.
However, the existing continuous high-heat-conductivity carbon fiber prepreg has the problems of high cost, low transverse heat conductivity (less than 3W/m.K), heat conduction anisotropy (the traditional prepreg cannot form a continuous heat conduction network in the plane and between layers, and the difference of the heat conductivity in the fiber direction and the vertical fiber direction is large), low Z-heat conduction (less than 1.5W/m.K) and the like, and the diffusion efficiency of heat in the structural plane is affected.
Therefore, how to provide a quasi-isotropic high-thermal-conductivity carbon fiber prepreg which can be applied to a high-performance thermal-conducting composite material, and how to improve the isotropic thermal conductivity and the Z-conduction of the high-performance thermal-conducting composite material are the problems to be solved in the field.
Disclosure of Invention
In view of the above, the invention provides a quasi-isotropic high-thermal-conductivity carbon fiber prepreg, a preparation method and application thereof, which avoid the problems of low thermal conductivity anisotropy and low Z-direction thermal conductivity of the existing high-thermal-conductivity carbon fiber prepreg and improve the isotropic thermal conductivity and Z-direction thermal conductivity of the high-performance thermal-dispersion composite material.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a preparation method of a quasi-isotropic high-heat-conductivity carbon fiber prepreg comprises the following steps:
1) Coating a surface treatment agent on the surface of the carbon fiber to obtain carbon fiber II;
2) Chopping the carbon fibers II, and randomly arranging the chopped carbon fibers II to obtain a non-woven fabric III;
3) Pressurizing the non-woven fabric III, and then performing heat treatment to obtain graphitized high-heat-conductivity carbon fiber non-woven fabric IV;
4) And mixing the high-heat-conductivity carbon fiber non-woven fabric IV with the resin film to obtain the quasi-isotropic high-heat-conductivity carbon fiber prepreg.
Preferably, the carbon fiber is mesophase pitch-based carbon fiber obtained by carbonization at 400-600 ℃.
Preferably, the surface treating agent comprises 5-10 parts of boron modified silicone oil, 10-20 parts of amino modified silicone oil, 15-25 parts of polyether modified silicone oil, 5-8 parts of long-chain alkyl polyoxyethylene ether and 35-65 parts of water.
Preferably, the carbon fiber II in the step 2) is chopped into 50-300 mm.
Preferably, the random arrangement forms a network structure with an areal density of 20-200 g/m 2 。
Preferably, the pressurizing pressure in the step 3) is 0.1-0.3 MPa, and the holding time is the time used in the whole heat treatment process.
Preferably, the heating rate of the heat treatment in the step 3) is 2-10 ℃/min, the treatment temperature is 2600-3000 ℃, and the heat preservation time is 1-30 min;
the heat treatment is performed under a protective atmosphere.
Preferably, the mass ratio of the high heat conduction carbon fiber non-woven fabric IV to the resin film is 50-80: 20 to 50.
Another object of the present invention is to provide a quasi-isotropic high thermal conductivity carbon fiber prepreg.
It is still another object of the present invention to provide an application of the quasi-isotropic high thermal conductivity carbon fiber prepreg in preparing high performance heat conducting materials.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the non-woven fabric is prepared by taking the discontinuous low-temperature carbonized mesophase pitch-based carbon fiber with low cost as a raw material, and the prepreg is prepared by a hot melting method, so that the production cost is reduced, the anisotropy of the existing continuous high-heat-conductivity carbon fiber prepreg is reduced, the transverse heat conductivity is improved, and the heat conduction in the X, Y direction in a plane is more uniform.
2. According to the invention, through the surface modification of the mesophase pitch-based carbon fiber carbonized at the low temperature of 400-600 ℃, modified silicone oil is loaded on the surface of the fiber, so that the effect of physical connection and chemical combination between adjacent fibers is achieved, the fiber is self-adhered in the heat treatment process, the heat conduction path is expanded, and the Z-direction heat conductivity of the high-heat-conductivity carbon fiber prepreg is improved.
3. According to the invention, B, si element is introduced in the surface treatment process, so that the effect of catalyzing graphitization is achieved in the graphitization process, the thermal conductivity of the fiber treated at the same graphitization temperature is higher, and the in-plane thermal conductivity and Z-direction thermal conductivity of the high-thermal-conductivity carbon fiber prepreg are finally improved.
4. The CFRP material prepared by the quasi-isotropic high-heat-conductivity carbon fiber prepreg has an in-plane heat conductivity of 10-20W/m.K, and a Z-direction heat conductivity of more than 5W/m.K.
Detailed Description
The invention provides a preparation method of a quasi-isotropic high-heat-conductivity carbon fiber prepreg, which comprises the following steps:
1) Coating a surface treatment agent on the surface of the carbon fiber to obtain carbon fiber II;
2) Chopping the carbon fibers II, and randomly arranging the chopped carbon fibers II to obtain a non-woven fabric III;
3) Pressurizing the non-woven fabric III, and then performing heat treatment to obtain graphitized high-heat-conductivity carbon fiber non-woven fabric IV;
4) And mixing the high-heat-conductivity carbon fiber non-woven fabric IV with the resin film to obtain the quasi-isotropic high-heat-conductivity carbon fiber prepreg.
In the invention, the carbon fiber is a mesophase pitch-based carbon fiber obtained by carbonization at 400-600 ℃, and the carbonization temperature is preferably 500 ℃.
In the invention, the mesophase pitch-based carbon fiber is one or more of petroleum-based, coal-based and naphthalene-based mesophase pitch-based carbon fibers.
In the present invention, the diameter of the mesophase pitch-based carbon fiber monofilaments is 7 to 13. Mu.m, preferably 8 to 12. Mu.m, and more preferably 10. Mu.m.
In the invention, the surface treating agent comprises 5-10 parts of boron modified silicone oil, 10-20 parts of amino modified silicone oil, 15-25 parts of polyether modified silicone oil, 5-8 parts of long-chain alkyl polyoxyethylene ether and 35-65 parts of water; preferably comprises 6 to 8 parts of boron modified silicone oil, 14 to 18 parts of amino modified silicone oil, 18 to 22 parts of polyether modified silicone oil, 5 to 7 parts of long-chain alkyl polyoxyethylene ether and 40 to 55 parts of water; further preferred are 8 parts of boron modified silicone oil, 15 parts of amino modified silicone oil, 20 parts of polyether modified silicone oil, 6 parts of long-chain alkyl polyoxyethylene ether and 50 parts of water.
In the present invention, the solid content of the surface treatment agent is 1 to 3wt.%, preferably 2wt.%; the particle size of the particles in the surface treating agent is 1-2 mu m.
In the invention, the residual rate of the surface treating agent after carbonization at 1000-1600 ℃ is 1-2 wt.%, and the particle size of the residual particles is 0.1-0.5 mu m; preferably, the residual rate after carbonization at 1200 ℃ is 1.5wt.%, and the residual particle size is 0.3 μm.
In the invention, the surface treating agent can preferably completely coat the surface of the carbon fiber, and the mass ratio of the surface treating agent to the carbon fiber is 0.5-2: 100, preferably 1:100.
In the present invention, the carbon fiber II in the step 2) is chopped to 50 to 300mm, preferably 80 to 200mm, and more preferably 120mm.
In the invention, the random arrangement forms a network structure with the surface density of 20-200 g/m 2 Preferably 50 to 150g/m 2 Further preferably 100g/m 2 。
In the present invention, the pressurizing pressure in the step 3) is 0.1 to 0.3MPa, preferably 0.2MPa.
In the present invention, the pressure holding time is the time taken for the whole heat treatment.
In the invention, the heating rate of the heat treatment in the step 3) is 2-10 ℃/min, the treatment temperature is 2600-3000 ℃, and the heat preservation time is 1-30 min; preferably, the heating rate is 3-8 ℃/min, the treatment temperature is 2700-2900 ℃, and the heat preservation time is 10-25 min; further preferably, the temperature rising rate is 5 ℃/min, the treatment temperature is 2800 ℃, and the heat preservation time is 20min.
In the present invention, the pressurizing operation and the heat treatment operation are preferably performed simultaneously.
In the present invention, the heat treatment includes a temperature increasing process, a heat preserving process, and a temperature decreasing process.
In the present invention, the heat treatment is performed under a protective atmosphere, preferably a rare gas atmosphere or a nitrogen atmosphere.
In the invention, the mass ratio of the high heat conduction carbon fiber non-woven fabric IV to the resin film is 50-80: 20 to 50, preferably 70:30.
in the present invention, the high thermal conductivity carbon fiber nonwoven fabric IV and the resin film are preferably melt-mixed.
In the present invention, the resin film is produced by a gumming machine using one of a thermosetting resin or a thermoplastic resin.
Wherein the thermosetting resin comprises one of epoxy resin, bismaleimide resin, cyanate resin, thermosetting polyimide resin or modified matters of the above resins; the thermoplastic resin comprises one of polypropylene, polyetherimide, polysulfone, polyethersulfone, polyetheretherketone and nylon.
The invention also provides a quasi-isotropic high-heat-conductivity carbon fiber prepreg.
In the invention, the surface density of the prepared quasi-isotropic high-heat-conductivity carbon fiber prepreg is 25-400 g/m 2 The thickness is 0.02-0.2 mm; preferably, the areal density is 200g/m 2 The thickness was 0.1mm.
It is still another object of the present invention to provide an application of the quasi-isotropic high thermal conductivity carbon fiber prepreg in preparing high performance heat conducting materials.
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The petroleum system intermediate phase pitch-based carbon fiber carbonized at 500 ℃ is selected as a raw material, and the mass ratio of the intermediate phase pitch-based carbon fiber to the surface treating agent is 1:100, spraying a surface treating agent on the surface of the mesophase pitch-based carbon fiber (the surface treating agent is 8 parts of boron modified silicone oil, 15 parts of amino modified silicone oil, 20 parts of polyether modified silicone oil, 6 parts of long-chain alkyl polyoxyethylene ether and 50 parts of water), so that the surface treating agent and the carbon fiber are chemically combined to obtain a carbon fiber II;
cutting the carbon fiber II to 100mm, and enabling the carbon fiber II to be arranged randomly in a two-dimensional plane under the action of air flow to form the carbon fiber II with the surface density of 100g/m 2 A network structure is adopted to obtain a non-woven fabric III;
the nonwoven fabric III was pressurized to 0.2MPa and subjected to graphitization under a nitrogen atmosphere (the temperature rise rate of graphitization was 5 ℃ C./min, the treatment temperature was 2800 ℃ C., the holding time was 20 min), and the holding time was the same as the time used for graphitization (heat treatment). Under the dual effects of pressure and temperature, the surface treatment agent is physically bonded and chemically combined with the fibers, the surface treatment agent is volatilized and decomposed along with the temperature rise, the B, si element contained in the surface treatment agent is chemically bonded with the carbon fibers under the high-temperature carbonization effect to form Si-C, si-B, si-B-C, B-C and other chemical bonds, the radial adhesion of the fibers is generated, the heat conduction path of the fibers is expanded, the graphitization of the carbon fibers is promoted by B, si element in the further graphitization treatment process, the high heat conduction is initiated, and finally the graphitized high heat conduction carbon fiber non-woven fabric IV is prepared;
taking 60 parts of high heat conduction carbon fiber non-woven fabric IV and 40 parts of Hansen 9249 resin film as raw materials, and carrying out melt mixing at 90 ℃ to obtain the product with 167g/m surface density 2 A quasi-isotropic high thermal conductivity carbon fiber prepreg with a thickness of 0.08 mm.
Example 2
Selecting coal-based mesophase pitch-based carbon fibers carbonized at 400 ℃ as raw materials, wherein the mass ratio of the mesophase pitch-based carbon fibers to the surface treating agent is 0.5:100, brushing a surface treating agent on the surface of the mesophase pitch-based carbon fiber (the surface treating agent is 10 parts of boron modified silicone oil, 10 parts of amino modified silicone oil, 25 parts of polyether modified silicone oil, 8 parts of long-chain alkyl polyoxyethylene ether and 60 parts of water), so that the surface treating agent and the carbon fiber are chemically combined to obtain a carbon fiber II;
cutting the carbon fiber II to 80mm, and mechanically arranging the carbon fiber II randomly in a two-dimensional plane to form a fiber with an areal density of 20g/m 2 A network structure is adopted to obtain a non-woven fabric III;
the nonwoven fabric III was pressurized to 0.1MPa and subjected to graphitization under a nitrogen atmosphere (the temperature rise rate of graphitization was 8 ℃ C./min, the treatment temperature was 2600 ℃ C., the holding time was 25 min), and the holding time was the same as the time used for graphitization (heat treatment). Under the dual effects of pressure and temperature, the surface treatment agent is physically bonded and chemically combined with the fibers, the surface treatment agent is volatilized and decomposed along with the temperature rise, the B, si element contained in the surface treatment agent is chemically bonded with the carbon fibers under the high-temperature carbonization effect to form Si-C, si-B, si-B-C, B-C and other chemical bonds, the radial adhesion of the fibers is generated, the heat conduction path of the fibers is expanded, the graphitization of the carbon fibers is promoted by B, si element in the further graphitization treatment process, the high heat conduction is initiated, and finally the graphitized high heat conduction carbon fiber non-woven fabric IV is prepared;
takes 80 parts of high heat conduction carbon fiber non-woven fabric IV and 20 parts of Hansort 6249 resin film of Tianjin Han as raw materials, and the raw materials are melted and mixed at 95 ℃ to obtain the product with the surface density of 25g/m 2 A quasi-isotropic high thermal conductivity carbon fiber prepreg with a thickness of 0.02 mm.
Example 3
The petroleum system mesophase pitch-based carbon fiber carbonized at 600 ℃ with the diameter of 13 μm is selected as a raw material, and the mass ratio of the mesophase pitch-based carbon fiber to the surface treating agent is 2:100, spraying a surface treating agent on the surface of the mesophase pitch-based carbon fiber (the surface treating agent is 5 parts of boron modified silicone oil, 20 parts of amino modified silicone oil, 15 parts of polyether modified silicone oil, 5 parts of long-chain alkyl polyoxyethylene ether and 30 parts of water), so that the surface treating agent and the carbon fiber are chemically combined to obtain a carbon fiber II;
chopping the carbon fiber II to 300mmThe carbon fibers II are arranged randomly in a two-dimensional plane under the action of air flow to form the carbon fiber composite material with the surface density of 200g/m 2 A network structure is adopted to obtain a non-woven fabric III;
the nonwoven fabric III was pressurized to 0.3MPa and subjected to graphitization under a helium atmosphere (the temperature rise rate of graphitization was 2 ℃ C./min, the treatment temperature was 3000 ℃ C., the holding time was 10 min), and the holding time was the same as the time used for graphitization (heat treatment). Under the dual effects of pressure and temperature, the surface treatment agent is physically bonded and chemically combined with the fibers, the surface treatment agent is volatilized and decomposed along with the temperature rise, the B, si element contained in the surface treatment agent is chemically bonded with the carbon fibers under the high-temperature carbonization effect to form Si-C, si-B, si-B-C, B-C and other chemical bonds, the radial adhesion of the fibers is generated, the heat conduction path of the fibers is expanded, the graphitization of the carbon fibers is promoted by B, si element in the further graphitization treatment process, the high heat conduction is initiated, and finally the graphitized high heat conduction carbon fiber non-woven fabric IV is prepared;
takes 55 parts of high heat conduction carbon fiber non-woven fabric IV and 45 parts of Hansen 9249 resin film as raw materials, and the raw materials are melted and mixed at 100 ℃ to obtain the surface density of 364g/m 2 A quasi-isotropic high thermal conductivity carbon fiber prepreg with a thickness of 0.17 mm.
Experimental example 1
The high-performance heat-conducting composite material was prepared by using the quasi-isotropic high-heat-conducting carbon fiber prepregs prepared in examples 1 to 3 as a raw material through a hot pressing method, the high-performance heat-conducting materials prepared in examples 1 to 3 were tested for X, Y and Z-directional heat conductivities (wherein X and Y are directions perpendicular to each other in a plane and Z is a direction perpendicular to a plane) according to GB/T22588-2008, and the heat-conducting composite material was prepared by using NT91500-525S prepreg manufactured by japan graphite fiber company as a raw material under the same preparation conditions as comparative example 1, and the test results were shown in table 1.
Table 1 table of the results of the measurement of the thermal conductivity in each direction
Table 1 shows that the high-performance heat conduction material prepared from the quasi-isotropic high-heat-conduction carbon fiber prepreg has higher heat conduction coefficients in the X and Y directions, and proves that the high-performance heat conduction material prepared by the method has good isotropic heat conduction effect, and meanwhile, the high-performance heat conduction material prepared by the method has higher Z heat conduction coefficient and good Z heat conduction effect.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The preparation method of the quasi-isotropic high-heat-conductivity carbon fiber prepreg is characterized by comprising the following steps of:
1) Coating a surface treatment agent on the surface of the carbon fiber to obtain carbon fiber II;
2) Chopping the carbon fibers II, and randomly arranging the chopped carbon fibers II to obtain a non-woven fabric III;
3) Pressurizing and heat treating the non-woven fabric III to obtain graphitized high-heat-conductivity carbon fiber non-woven fabric IV;
4) Mixing the high-heat-conductivity carbon fiber non-woven fabric IV with a resin film to obtain a quasi-isotropic high-heat-conductivity carbon fiber prepreg;
the heating rate of the heat treatment in the step 3) is 2-10 ℃/min, the treatment temperature is 2600-3000 ℃, and the heat preservation time is 1-30 min;
the heat treatment is carried out under a protective atmosphere;
the carbon fiber is a mesophase pitch-based carbon fiber obtained by carbonization at 400-600 ℃;
the surface treatment agent comprises 5-10 parts of boron modified silicone oil, 10-20 parts of amino modified silicone oil, 15-25 parts of polyether modified silicone oil, 5-8 parts of long-chain alkyl polyoxyethylene ether and 35-65 parts of water.
2. The method for preparing the quasi-isotropic high-thermal-conductivity carbon fiber prepreg according to claim 1, wherein the carbon fiber II in the step 2) is chopped to 50-300 mm.
3. The method for preparing the quasi-isotropic high-thermal-conductivity carbon fiber prepreg according to claim 2, wherein the random arrangement forms a network structure, and the surface density is 20-200 g/m 2 。
4. The method for preparing a quasi-isotropic high thermal conductivity carbon fiber prepreg according to claim 3, wherein the pressurizing pressure in the step 3) is 0.1-0.3 mpa, and the holding time is the time used in the whole heat treatment process.
5. The method for preparing the quasi-isotropic high-thermal-conductivity carbon fiber prepreg according to any one of claims 1 or 3-4, wherein the mass ratio of the high-thermal-conductivity carbon fiber non-woven fabric IV to the resin film is 50-80: 20-50.
6. The quasi-isotropic high-thermal-conductivity carbon fiber prepreg prepared by the preparation method of any one of claims 1-5.
7. The use of a quasi-isotropic high thermal conductivity carbon fiber prepreg according to claim 6 for preparing high performance thermally conductive materials.
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