CN112391054A - Vacuum electromagnetic preparation method of silica gel-based carbon material oriented heat-conducting interface material - Google Patents
Vacuum electromagnetic preparation method of silica gel-based carbon material oriented heat-conducting interface material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 56
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000003575 carbonaceous material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000000741 silica gel Substances 0.000 title claims abstract description 22
- 229910002027 silica gel Inorganic materials 0.000 title claims abstract description 22
- 239000004917 carbon fiber Substances 0.000 claims abstract description 70
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 69
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000000843 powder Substances 0.000 claims abstract description 37
- 238000004513 sizing Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000007493 shaping process Methods 0.000 claims abstract description 12
- 230000005415 magnetization Effects 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 15
- 229920002050 silicone resin Polymers 0.000 claims description 15
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims description 14
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 20
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 10
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000002105 nanoparticle Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 5
- 229920002545 silicone oil Polymers 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PZJJKWKADRNWSW-UHFFFAOYSA-N trimethoxysilicon Chemical group CO[Si](OC)OC PZJJKWKADRNWSW-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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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
- C08K9/02—Ingredients treated with inorganic substances
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- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
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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
- 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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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- 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
- C08J2383/00—Characterised by the use 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; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/01—Magnetic additives
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
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Abstract
The invention discloses a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which comprises the following steps: s1: carrying out surface magnetization treatment on the carbon fibers to obtain carbon fiber magnetized powder; s2: mixing the carbon fiber magnetized powder and the curable sizing material and then putting the mixture into a hydraulic injection extruder; s3: vacuum electromagnetic orientation; s4: shaping; s5: and (6) slicing. By adopting the vacuum electromagnetic condition for the orientation of the silica gel-based carbon fiber, the orientation rate of the carbon fiber can be improved, and a heat conduction channel is easy to form, thereby realizing high heat conduction performance.
Description
Technical Field
The invention relates to the technical field of heat conduction materials, in particular to a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat conduction interface material.
Background
The carbon fiber has good electric and heat conducting properties. The material has obvious anisotropy, and the heat conduction and the electric conduction performance are many times lower in the direction vertical to the filaments, so that the material prepared by arranging the carbon fibers according to a certain rule by utilizing the orientation technology has very good heat conduction performance and wave absorption performance.
The existing heat conduction carbon fiber is mainly added with an oriented carbon nanotube or other anisotropic carbon materials to improve the orientation, the heat conduction filler is added to improve the heat conduction performance, but the orientation of the carbon fiber cannot be improved, so that the heat conduction of the carbon fiber is unbalanced and has single function, and the limitation is caused in the practical application.
Disclosure of Invention
The application solves the problem of poor thermal conductivity in the prior art by providing a vacuum electromagnetic preparation method of the silica gel-based carbon material oriented thermal interface material, and achieves the technical effects of high thermal conductivity and balanced thermal conductivity.
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which comprises the following steps: s1: carrying out surface magnetization treatment on the carbon fibers to obtain carbon fiber magnetized powder; s2: mixing the carbon fiber magnetized powder and the curable sizing material and then putting the mixture into a hydraulic injection extruder; s3: vacuum electromagnetic orientation; s4: shaping; s5: and (6) slicing.
As a preferred embodiment, the carbon fiber surface magnetization treatment method comprises: mixing carbon fiber powder and water according to a certain weight part ratio, adding FeCl in a certain proportion3·6H2O and FeCl2·4H2And O, adding ammonia water to adjust the pH value to 9.5-10.5, and finally filtering, washing and drying.
As a preferred embodiment, the FeCl3·6H2O and FeCl2·4H2The molar ratio of O is 1-3: 1.
as a preferred embodiment, the curable setting material is a silicone resin curable at room temperature.
In a preferred embodiment, the curable sizing material accounts for 10% -30% of the total mass of the carbon fiber magnetized powder and the curable sizing material.
In a preferable embodiment, the carbon fiber magnetized powder is 50-88 parts by weight, and the curable setting material is 12-50 parts by weight.
As a preferred embodiment, the S3: the vacuum electromagnetic orientation method comprises the steps of extruding a mixture of carbon fiber magnetized powder and a curable sizing material through a needle nozzle of a hydraulic injection extruder under vacuum, arranging extruded strips in a rectangular container in order, and applying a magnetic field with uniform strength to the rectangular container.
In a preferred embodiment, the caliber of the needle nozzle is 2-3 mm.
In a preferred embodiment, the magnetic field direction of the magnetic field coincides with the longitudinal direction of the rectangular container.
As a preferred embodiment, the S4: the shaping method comprises the steps of placing the vacuum, and shaping the silica gel-based carbon material by controlling the temperature.
Has the advantages that: the method has the advantages that the surface of the carbon fiber is magnetized, orientation of the carbon fiber, electric charge and force borne by current in an electromagnetic field can be improved, and the carbon fiber can be higher in orientation rate and highly consistent in orientation direction when a magnetic field with uniform strength is added. The vacuum is added during extrusion, so that the material is more compact, a heat conduction channel is easy to form, and the silica gel-based carbon material is easy to realize high heat conduction performance.
Detailed Description
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which comprises the following steps: s1: carrying out surface magnetization treatment on the carbon fibers to obtain carbon fiber magnetized powder; s2: mixing the carbon fiber magnetized powder and the curable sizing material and then putting the mixture into a hydraulic injection extruder; s3: vacuum electromagnetic orientation; s4: shaping; s5: and (6) slicing.
As a preferred embodiment, the carbon fiber surface magnetization treatment method comprises: mixing carbon fiber powder and water according to a certain weight part ratio, adding FeCl in a certain proportion3·6H2O and FeCl2·4H2And O, adding ammonia water to adjust the pH value to 9.5-10.5, and finally filtering, washing and drying.
Preferably, the carbon fiber surface magnetization treatment method comprises the following steps: the weight portion of the material is as follows: mixing 4-12 parts of carbon fiber powder with 300-420 parts of water to prepare an aqueous solution containing carbon fibers; weighing 38-42 parts of FeCl3·6H2O and FeCl2·4H2O, in an aqueous solution of carbon fibers, wherein FeCl3·6H2O and FeCl2·4H2The molar ratio of O is 1.5-2.5: 1, slowly adding ammonia water at room temperature to keep the pH value at 9.6-10.2, stirring for reaction for 1-2h, then coprecipitating for 2-3h at 40-60 ℃, washing the product with distilled water to neutrality, and finally drying the product at 100-140 ℃ to form powder.
The carbon fiber is not particularly limited by the manufacturer.
Preferably, the carbon fiber magnetized powder is Fe3O4Particle-coated carbon fiber composite powder.
Fe3O4The nano particles have relatively high magnetic coercive force, small size and uneven surface, and can improve the stress of charges and current in an electromagnetic field. The applicant has found that when Fe2+:Fe3+Fe produced at a molar concentration ratio of 1:1-33O4The carbon fiber composite material coated by the nano particles shows highly consistent orientation directions during vacuum magnetization, and is higher in compactness than carbon fibers, so that the heat conducting property is better.
As a preferred embodiment, the FeCl3·6H2O and FeCl2·4H2The molar ratio of O is 1-3: 1.
FeCl3·6H2o and FeCl2·4H2O is synthetic Fe3O4Critical component of (1), but Fe during the reaction2+And Fe3+Different contents of Fe will affect3O4And (4) generating nanoparticles. The applicant found that: when FeCl is added3·6H2O and FeCl2·4H2The molar concentration ratio of O is 1-3: 1, highly dispersed Fe can be produced3O4Carbon fiber composite material coated by nano particles. Fe2+Readily oxidizable, but FeCl3·6H2O and Fe (OH) generated under alkaline environment3In Fe2+And Fe3+Can inhibit each other and promote the generation of Fe3O4The reaction of the nanoparticles is carried out.
As a preferred embodiment, the curable setting material is a silicone resin curable at room temperature.
The curable sizing material is self-made silicone resin capable of being cured at room temperature, and can improve the thermal conductivity and mechanical property of the silica-based carbon material. The possible reasons are: the room temperature solidified silicone resin has high thermal decomposition temperature, is a block silicone resin copolymer synthesized by copolymerizing silicone resin prepolymer and hydroxyl silicone oil, has a unique structure, can be quickly solidified at room temperature, and can be further copolymerized with Fe3O4The carbon fiber coated by the nano particles is crosslinked to generate a net structure, so that the bonding force and mechanical property between molecules on the interface of the silica gel-based carbon material and an object are improved.
Preferably, the preparation method of the room temperature curable silicone resin comprises the following steps: (1) adding 80-90g of water, 150g of toluene 140-; (2) uniformly mixing 10-15g of the silicone resin prepolymer prepared in the step (1), 18-20g of hydroxyl silicone oil, 180g of toluene 150-and 0.4-0.6g of concentrated sulfuric acid with the molar concentration of 70-80%, heating and refluxing, removing generated water and methanol, curing for 3-6 hours, cooling to room temperature after the reaction is finished, filtering, and evaporating the solvent from the filtrate under reduced pressure to obtain the room-temperature-curable silicone resin.
Preferably, the hydroxyl silicone oil is dimethyl hydroxyl silicone oil. The CAS number of the dimethylhydroxysilicone oil is 70131-67-8, and the dimethylhydroxysilicone oil is purchased from Sendy Biotech, Inc. of Shenzhen.
The CAS number of the trimethoxy silane is 2487-90-3 and is purchased from morning light chemical company Limited.
Toluene CAS number 108-88-3, purchased from Nanjing chemical reagents, Inc.
In a preferred embodiment, the curable sizing material accounts for 10% -30% of the total mass of the carbon fiber magnetized powder and the curable sizing material.
The carbon fiber powder accounts for 10-30% of the carbon fiber magnetized powder by mass, the carbon fiber with high aspect ratio can play a good role of a bridge, so that the carbon fiber and the silicon resin particles are mutually connected, more heat conduction channels are formed during vacuum electromagnetism, and the orientation is more obvious.
In a preferable embodiment, the carbon fiber magnetized powder is 50-88 parts by weight, and the curable setting material is 12-50 parts by weight.
As a preferred embodiment, the S3: the vacuum electromagnetic orientation method comprises the steps of extruding a mixture of carbon fiber magnetized powder and a curable sizing material through a needle nozzle of a hydraulic injection extruder under vacuum, arranging extruded strips in a rectangular container in order, and applying a magnetic field with uniform strength to the rectangular container.
When silica gel-based carbon fibers are oriented, the orientation rate of the carbon fibers can be higher under electromagnetic force, the orientation directions are highly consistent, and the carbon fibers and the curable sizing material can be more compact and easily form a heat conduction channel by adding a magnetic field under a vacuum state, so that the high heat conduction performance of orientation is realized.
In a preferred embodiment, the caliber of the needle nozzle is 2-3 mm.
In a preferred embodiment, the magnetic field direction of the magnetic field coincides with the longitudinal direction of the rectangular container.
Preferably, the magnetic field strength is > 1T;
as a preferred embodiment, the S4: the shaping method comprises the steps of placing the vacuum, and shaping the silica gel-based carbon material by controlling the temperature.
Preferably, the temperature is 20 to 150 ℃.
Preferably, in the S5 cut piece, the cutting thickness is 0.3-5.0 mm.
Examples
Example 1
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which comprises the following steps: s1: carrying out surface magnetization treatment on the carbon fibers to obtain carbon fiber magnetized powder; s2: mixing carbon fiber magnetized powder and room-temperature curable silicone resin, and putting the mixture into a hydraulic injection extruder; s3: vacuum electromagnetic orientation; s4: shaping; s5: and (6) slicing.
S1: carbon fiberThe method for obtaining the carbon fiber magnetized powder by surface magnetization treatment comprises the following steps: the weight portion of the material is as follows: mixing 10 parts of carbon fiber powder with 400 parts of water to prepare an aqueous solution containing carbon fibers; 40 parts of FeCl3·6H2O and FeCl2·4H2O, in an aqueous solution of carbon fibers, wherein FeCl3·6H2O and FeCl2·4H2The molar ratio of O is 4: slowly adding ammonia water at room temperature to keep the pH value at 10, stirring for reaction for 2h, then carrying out coprecipitation for 3h at 50 ℃, washing a product to be neutral by using distilled water, and finally drying the product at 120 ℃ to form powder;
s2: mixing 85 parts of carbon fiber magnetized powder and 15 parts of curable sizing material, and putting the mixture into a hydraulic injection extruder;
s3: vacuum electromagnetic orientation: extruding the extrudate in the S2 through a needle nozzle under the vacuum condition, arranging the extrudate in a rectangular container in a strip shape, stacking the extrudate to a thickness consistent with the height of the rectangular container, and applying a uniform magnetic field to two ends of the rectangular container in the length direction, wherein the caliber of the needle nozzle is 2.5mm, and the magnetic field strength is 3T.
S4: shaping: after vacuum-pumping, the S3 oriented material is shaped at room temperature
S5: slicing: cutting into 0.3mm thick.
The preparation method of the room temperature curable silicone resin comprises the following steps: (1) adding 85g of water, 150g of toluene, 80g of xylene and 0.8g of concentrated sulfuric acid with the molar concentration of 78% into a stirrer, dropwise adding 235g of trimethoxy silane while stirring, carrying out reflux reaction for 1.5h, cooling to room temperature, washing with water to be neutral, drying, filtering and concentrating to obtain a silicone resin prepolymer; (2) uniformly mixing 12g of the silicone resin prepolymer prepared in the step (1), 20g of hydroxy silicone oil, 175g of toluene and 0.5g of concentrated sulfuric acid with the molar concentration of 78%, heating and refluxing, removing generated water and methanol, curing for 5.5h, cooling to room temperature after the reaction is finished, filtering, and evaporating the filtrate under reduced pressure to remove the solvent to obtain the room-temperature-curable silicone resin.
Ammonia CAS number 1336-21-6, purchased from Nanjing chemical Co., Ltd. The CAS number of the dimethylhydroxysiloxane oil is 70131-67-8, and the dimethylhydroxysiloxane oil is purchased from Sendzi Biotech Limited in Shenzhen. The CAS number of the trimethoxy silane is 2487-90-3 and is purchased from morning light chemical company Limited. Toluene CAS number 108-88-3, purchased from Nanjing chemical reagents, Inc.
Example 2
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which is different from that of embodiment 1 in that S2: and mixing 80 parts of carbon fiber magnetized powder and 20 parts of curable sizing material, and putting the mixture into a hydraulic injection extruder.
Comparative example 1
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, and the specific implementation manner is the same as that of example 1, but the difference is that no vacuum condition exists in S3.
Comparative example 2
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which is different from that of embodiment 1 in that S1: in the method for obtaining carbon fiber magnetized powder by magnetizing carbon fiber surface, FeCl3·6H2O and FeCl2·4H2The molar ratio of O is 0.5: 1.
comparative example 3
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which is different from that of embodiment 1 in that S1: in the method for obtaining carbon fiber magnetized powder by magnetizing carbon fiber surface, FeCl3·6H2O and FeCl2·4H2The molar ratio of O is 4: 1.
comparative example 4
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which is different from the embodiment 1 in the point that S2 is implemented by mixing 60 parts of carbon fiber magnetized powder and 40 parts of curable sizing material and then putting the mixture into a hydraulic injection extruder.
Comparative example 5
The application provides a vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material, which is different from the embodiment 1 in the point that S2, 92 parts of carbon fiber magnetized powder and 8 parts of curable sizing materials are mixed and then placed in a hydraulic injection extruder.
Performance test method
Coefficient of thermal conductivity: testing according to astm d 5470;
performance test data
Claims (10)
1. A vacuum electromagnetic preparation method of a silica gel-based carbon material oriented heat-conducting interface material is characterized by comprising the following steps: s1: carrying out surface magnetization treatment on the carbon fibers to obtain carbon fiber magnetized powder; s2: mixing the carbon fiber magnetized powder and the curable sizing material and then putting the mixture into a hydraulic injection extruder; s3: vacuum electromagnetic orientation; s4: shaping; s5: and (6) slicing.
2. The vacuum electromagnetic preparation method of the silica-based carbon material oriented heat-conducting interface material as claimed in claim 1, wherein the carbon fiber surface magnetization treatment method comprises: mixing carbon fiber powder and water according to a certain weight part ratio, adding FeCl in a certain proportion3·6H2O and FeCl2·4H2And O, adding ammonia water to adjust the pH value to 9.5-10.5, and finally filtering, washing and drying.
3. The vacuum electromagnetic preparation method of silica-based carbon material oriented heat-conducting interface material as claimed in claim 2, wherein said FeCl is3·6H2O and FeCl2·4H2The molar ratio of O is 1-3: 1.
4. the vacuum electromagnetic preparation method of a silica-based carbon material oriented heat-conducting interface material as claimed in claim 1, wherein the curable sizing material is a silicone resin curable at room temperature.
5. The vacuum electromagnetic preparation method of the silica-based carbon material oriented heat-conducting interface material as claimed in claim 1, wherein the curable sizing material accounts for 10% -30% of the total mass of the carbon fiber magnetized powder and the curable sizing material.
6. The vacuum electromagnetic preparation method of the silica-based carbon material oriented heat-conducting interface material as claimed in claim 1, wherein the carbon fiber magnetized powder is 50-88 parts by weight, and the curable sizing material is 12-50 parts by weight.
7. The vacuum electromagnetic preparation method of the silica-based carbon material oriented heat-conducting interface material as claimed in claim 1, wherein the step of S3: the vacuum electromagnetic orientation method comprises the steps of extruding a mixture of carbon fiber magnetized powder and a curable sizing material through a needle nozzle of a hydraulic injection extruder under vacuum, arranging extruded strips in a rectangular container in order, and applying a magnetic field with uniform strength to the rectangular container.
8. The vacuum electromagnetic preparation method of a silica-based carbon material oriented heat-conducting interface material as claimed in claim 7, wherein the caliber of the needle nozzle is 2-3 mm.
9. The vacuum electromagnetic preparation method of a silica-based carbon material oriented heat conduction interface material as claimed in claim 7, wherein the magnetic field direction of the magnetic field is consistent with the length direction of the rectangular container.
10. The vacuum electromagnetic preparation method of the silica-based carbon material oriented heat-conducting interface material as claimed in claim 1, wherein the step of S4: the shaping method comprises the steps of placing the vacuum, and shaping the silica gel-based carbon material by controlling the temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113337040A (en) * | 2021-06-18 | 2021-09-03 | 广东工业大学 | Plastic pipe for high-thermal-conductivity cable and preparation method and application thereof |
| CN114989613A (en) * | 2022-06-30 | 2022-09-02 | 哈尔滨理工大学 | Preparation method of heat-conducting silicon rubber filled with highly-oriented silicon carbide whiskers |
| CN115652618A (en) * | 2022-10-30 | 2023-01-31 | 同济大学 | Carbon fiber and heat-conducting interface material with wave-absorbing function and preparation method thereof |
| CN115652618B (en) * | 2022-10-30 | 2024-02-27 | 同济大学 | Carbon fiber and heat conduction interface material with wave absorbing function and preparation method thereof |
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