CN116496632A - Graphite aluminum composite heat dissipation material and preparation method thereof - Google Patents
Graphite aluminum composite heat dissipation material and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 91
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 65
- 239000000463 material Substances 0.000 title claims abstract description 60
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 58
- 239000002131 composite material Substances 0.000 title claims abstract description 57
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 38
- 239000010439 graphite Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 54
- 239000006185 dispersion Substances 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000003054 catalyst Substances 0.000 claims abstract description 31
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 31
- 239000001913 cellulose Substances 0.000 claims abstract description 30
- 229920002678 cellulose Polymers 0.000 claims abstract description 30
- 229920002545 silicone oil Polymers 0.000 claims abstract description 28
- 239000012188 paraffin wax Substances 0.000 claims abstract description 24
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 3
- 239000000758 substrate Substances 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 21
- 238000007790 scraping Methods 0.000 claims description 18
- 238000005245 sintering Methods 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000007822 coupling agent Substances 0.000 claims description 14
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- ZTQSAGDEMFDKMZ-UHFFFAOYSA-N Butyraldehyde Chemical compound CCCC=O ZTQSAGDEMFDKMZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 4
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 229910021595 Copper(I) iodide Inorganic materials 0.000 claims description 3
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 claims description 3
- 239000006084 composite stabilizer Substances 0.000 claims description 3
- LSXDOTMGLUJQCM-UHFFFAOYSA-M copper(i) iodide Chemical compound I[Cu] LSXDOTMGLUJQCM-UHFFFAOYSA-M 0.000 claims description 3
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims description 3
- 229960001545 hydrotalcite Drugs 0.000 claims description 3
- 229910001701 hydrotalcite Inorganic materials 0.000 claims description 3
- 229910000484 niobium oxide Inorganic materials 0.000 claims description 3
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims description 3
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229910003447 praseodymium oxide Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 150000001879 copper Chemical class 0.000 claims description 2
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N valeric aldehyde Natural products CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000010345 tape casting Methods 0.000 claims 1
- 238000013329 compounding Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- -1 graphite aluminum compound Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012795 verification 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
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
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- C—CHEMISTRY; METALLURGY
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a graphite aluminum composite heat dissipation material and a preparation method thereof, wherein the graphite aluminum composite heat dissipation material comprises the following raw materials in parts by weight: 25-40 parts of graphene; 35-60 parts of aluminum powder; 9-15 parts of cellulose nanofibrils; 30-45 parts of dispersion base liquid; 10-17 parts of heat-conducting silicone oil; 5-10 parts of a heat stabilizer; 6-12 parts of a catalyst; 5-10 parts of cross-linking agent; 15-24 parts of paraffin. According to the invention, graphene and aluminum powder are used as raw materials, and a proper amount of cellulose nanofibrils are added, so that the overall toughness of the graphite aluminum composite heat dissipation material can be ensured while the graphene consumption is reduced, and a proper amount of heat conduction silicone oil is added, so that the heat conduction performance of the graphite aluminum composite heat dissipation material is improved, the compounding of graphene and aluminum is realized, the heat conduction performance of the graphite aluminum composite heat dissipation material is improved after molding, and the tensile strength of pure aluminum is improved.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a graphite aluminum composite heat dissipation material and a preparation method thereof.
Background
Along with the increasing integration degree of electronic products such as mobile phones and computers, the power is gradually increased, and the light source, the battery and the like can generate heat in the using process, so that the heat dissipation material is required to have higher heat conductivity aiming at the requirements of heat dissipation products. If an effective heat dissipation is not achieved, the basic functions of functional components such as chips, light sources and batteries are permanently damaged.
At present, the heat dissipation is carried out through metal materials such as aluminum alloy, and various heat dissipation products are manufactured by utilizing the advantages of good heat dissipation effect, good processing performance, low cost and the like of the metal materials such as aluminum alloy so as to meet the integrated heat dissipation requirement of electronic products. However, in the prior art, the heat dissipation parts of the electronic equipment are mostly realized by heat dissipation sheets of metal copper, metal aluminum, steel and the like, and the weight of the terminal product is increased due to inconvenient installation caused by large mass of metal materials.
And graphene is used as a novel two-dimensional crystal material, has the ultra-high strength, and has single-layer thermal conductivity as high as 5300W/(m.K) and excellent radiation performance. Provides an unattainable opportunity for the development of new generation heat dissipation materials. How to compound graphene and aluminum metal to prepare the graphite aluminum compound heat dissipation material so as to meet the higher heat dissipation requirement of heat dissipation products.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a graphite aluminum composite heat dissipation material and a preparation method thereof, and the heat conduction performance of the graphite aluminum composite heat dissipation material is improved and the tensile strength of pure aluminum is improved by improving the bonding interface of graphene and metal aluminum so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the graphite aluminum composite heat dissipation material comprises the following raw materials in parts by weight:
25-40 parts of graphene; 35-60 parts of aluminum powder; 9-15 parts of cellulose nanofibrils; 30-45 parts of dispersion base liquid; 10-17 parts of heat-conducting silicone oil; 5-10 parts of a heat stabilizer; 6-12 parts of a catalyst; 5-10 parts of cross-linking agent; 15-24 parts of paraffin.
As a further scheme of the invention, the graphite aluminum composite heat dissipation material comprises the following raw materials in parts by weight: 35 parts of graphene; 50 parts of aluminum powder; 13 parts of cellulose nanofibrils; 37 parts of dispersion base liquid; 14 parts of heat-conducting silicone oil; 7 parts of a heat stabilizer; 9 parts of a catalyst; 8 parts of a cross-linking agent; 20 parts of paraffin.
As a further scheme of the invention, the dispersion base solution is prepared by mixing polyvinyl alcohol and polyvinyl formal according to a mass ratio of 1:1, and then adding ethanol with a concentration of 95% according to a mass ratio of 1:1.25 after mixing, and uniformly mixing.
As a further scheme of the invention, the heat stabilizer is any one of a copper salt stabilizer, a calcium-zinc composite stabilizer, cuprous iodide or hydrotalcite.
As a further scheme of the invention, the catalyst is one of cerium oxide, barium oxide, praseodymium oxide and niobium oxide.
As a further scheme of the invention, the cross-linking agent is one of polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, glutaraldehyde and butyraldehyde.
A preparation method of a graphite aluminum composite heat dissipation material comprises the following steps:
1) Weighing graphene, aluminum powder, cellulose nanofibrils, dispersion base liquid, heat conduction silicone oil, heat stabilizer, catalyst, coupling agent and paraffin according to parts by weight for standby;
2) Adding graphene and cellulose nanofibrils into a dispersion base liquid, and performing ultrasonic dispersion for 10-25min to form a graphene dispersion liquid;
3) Adding 80-120 mesh aluminum powder, heat conduction silicone oil and a heat stabilizer into the graphene dispersion liquid, ultrasonically dispersing for 15min, adding a catalyst and a coupling agent, and ultrasonically dispersing for 45min at 35-65 ℃ to obtain a graphene-aluminum powder mixture;
4) And after the coating substrate is taken and a layer of paraffin is sprayed, the graphene-aluminum powder mixture is coated on the surface of the coating substrate in a scraping mode, the thickness of the coating is 1-10mm, the coating is sequentially conveyed into a curing box for curing, the curing box is sintered in a tube furnace, and the coating is taken out after sintering molding, so that the graphite-aluminum composite heat dissipation material is prepared.
As a further scheme of the invention, in the step 4), the scraping speed of the graphene-aluminum powder mixture which is scraped on the surface of the coated substrate is 1-3m/min; the curing is carried out in a curing box at 70-95 ℃ for 25-30min.
In the step 4), when the graphene-aluminum powder mixture which is scraped on the surface of the coated substrate is sintered, the graphene-aluminum powder mixture is subjected to reduction sintering for 1-2h at 95-110 ℃, and is subjected to secondary sintering for 50min at 110-230 ℃, and the graphite-aluminum composite heat dissipation material is obtained after cooling.
As a further aspect of the present invention, the coated substrate is one of a steel plate, an aluminized zinc plate, a galvanized plate, and a stainless steel plate.
Compared with the prior art, the invention has the beneficial effects that:
according to the graphite aluminum composite heat dissipation material prepared by the invention, graphene and aluminum powder are used as raw materials, and a proper amount of cellulose nanofibrils are added, and as the cellulose nanofibrils are 1/5 lighter than steel, the strength is 5 times that of the steel, and the linear thermal expansion is small, the overall toughness of the graphite aluminum composite heat dissipation material can be ensured while the graphene consumption is reduced, and the production cost of the graphite aluminum composite heat dissipation material is reduced. The proper amount of heat conduction silicone oil is added, so that the heat conduction performance of the graphite-aluminum composite heat dissipation material is improved, the composition of graphene and aluminum is realized after the heat conduction performance is coated, solidified and sintered, the graphene can be uniformly dispersed in aluminum powder to form a graphene-aluminum powder mixture, the heat conduction performance of the graphite-aluminum composite heat dissipation material is improved after the heat conduction performance is molded, and the tensile strength of pure aluminum is improved.
In order to more clearly illustrate the structural features and efficacy of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a flowchart of a preparation method of a graphite aluminum composite heat dissipation material according to an embodiment of the invention.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the specific embodiments.
Example 1
The embodiment of the invention provides a graphite aluminum composite heat dissipation material, which comprises the following raw materials in parts by weight:
25 parts of graphene; 35 parts of aluminum powder; 9 parts of cellulose nanofibrils; 30 parts of dispersion base liquid; 10 parts of heat-conducting silicone oil; 5 parts of a heat stabilizer; 6 parts of a catalyst; 5 parts of a cross-linking agent; 15 parts of paraffin.
In this embodiment, the dispersion base solution is prepared by mixing polyvinyl alcohol and polyvinyl formal according to a mass ratio of 1:1, and adding 95% ethanol according to a mass ratio of 1:1.25 after mixing, and mixing uniformly.
In this embodiment, the heat stabilizer is a copper salt stabilizer; the catalyst is cerium oxide; the cross-linking agent is polyethylene glycol.
Referring to fig. 1, a preparation method of a graphite aluminum composite heat dissipation material comprises the following steps:
1) Weighing graphene, aluminum powder, cellulose nanofibrils, dispersion base liquid, heat conduction silicone oil, heat stabilizer, catalyst, coupling agent and paraffin according to parts by weight for standby;
2) Adding graphene and cellulose nanofibrils into a dispersion base liquid, and performing ultrasonic dispersion for 10min to form a graphene dispersion liquid;
3) Adding 80-mesh aluminum powder, heat-conducting silicone oil and a heat stabilizer into the graphene dispersion liquid, ultrasonically dispersing for 15min, adding a catalyst and a coupling agent, and ultrasonically dispersing for 45min at 65 ℃ to obtain a graphene-aluminum powder mixture;
4) And after taking the coated substrate and spraying a layer of paraffin, scraping the graphene-aluminum powder mixture on the surface of the coated substrate, wherein the scraping thickness is 1mm, the scraping speed is 1m/min, sequentially conveying the coated substrate into a curing box for curing, wherein the curing temperature is 70 ℃, the curing time is 30min, carrying out reduction sintering for 2h at 95 ℃ in a tubular furnace, carrying out secondary sintering for 50min at 110 ℃, and cooling to obtain the graphite-aluminum composite heat dissipation material.
In this embodiment, the coated substrate is a steel plate.
Example 2
The embodiment of the invention provides a graphite aluminum composite heat dissipation material, which comprises the following raw materials in parts by weight:
30 parts of graphene; 40 parts of aluminum powder; 10 parts of cellulose nanofibrils; 33 parts of a dispersion base liquid; 12 parts of heat-conducting silicone oil; 6 parts of a heat stabilizer; 8 parts of a catalyst; 6 parts of a cross-linking agent; 17 parts of paraffin.
In this embodiment, the dispersion base solution is prepared by mixing polyvinyl alcohol and polyvinyl formal according to a mass ratio of 1:1, and adding 95% ethanol according to a mass ratio of 1:1.25 after mixing, and mixing uniformly.
In this embodiment, the heat stabilizer is a calcium-zinc composite stabilizer; the catalyst is barium oxide; the cross-linking agent is polyvinylpyrrolidone.
Referring to fig. 1, a preparation method of a graphite aluminum composite heat dissipation material comprises the following steps:
1) Weighing graphene, aluminum powder, cellulose nanofibrils, dispersion base liquid, heat conduction silicone oil, heat stabilizer, catalyst, coupling agent and paraffin according to parts by weight for standby;
2) Adding graphene and cellulose nanofibrils into a dispersion base liquid, and performing ultrasonic dispersion for 14min to form a graphene dispersion liquid;
3) Adding 90-mesh aluminum powder, heat-conducting silicone oil and a heat stabilizer into the graphene dispersion liquid, ultrasonically dispersing for 15min, adding a catalyst and a coupling agent, and ultrasonically dispersing for 45min at 40 ℃ to obtain a graphene-aluminum powder mixture;
4) And after taking the coated substrate and spraying a layer of paraffin, scraping the graphene-aluminum powder mixture on the surface of the coated substrate, wherein the scraping thickness is 3mm, the scraping speed is 2m/min, sequentially conveying the coated substrate into a curing box for curing, the curing temperature is 85 ℃, the curing time is 27min, carrying out reduction sintering for 1.5h at 100 ℃ in a tubular furnace, carrying out secondary sintering for 50min at 160 ℃, and cooling to obtain the graphite-aluminum composite heat dissipation material.
In this embodiment, the coated substrate is an aluminized zinc sheet.
Example 3
The embodiment of the invention provides a graphite aluminum composite heat dissipation material, which comprises the following raw materials in parts by weight:
35 parts of graphene; 50 parts of aluminum powder; 13 parts of cellulose nanofibrils; 37 parts of dispersion base liquid; 14 parts of heat-conducting silicone oil; 7 parts of a heat stabilizer; 9 parts of a catalyst; 8 parts of a cross-linking agent; 20 parts of paraffin.
In this embodiment, the dispersion base solution is prepared by mixing polyvinyl alcohol and polyvinyl formal according to a mass ratio of 1:1, and adding 95% ethanol according to a mass ratio of 1:1.25 after mixing, and mixing uniformly.
In this embodiment, the heat stabilizer is cuprous iodide; the catalyst is praseodymium oxide; the cross-linking agent is polyvinyl alcohol.
Referring to fig. 1, a preparation method of a graphite aluminum composite heat dissipation material comprises the following steps:
1) Weighing graphene, aluminum powder, cellulose nanofibrils, dispersion base liquid, heat conduction silicone oil, heat stabilizer, catalyst, coupling agent and paraffin according to parts by weight for standby;
2) Adding graphene and cellulose nanofibrils into a dispersion base liquid, and performing ultrasonic dispersion for 17min to form a graphene dispersion liquid;
3) Adding 95-mesh aluminum powder, heat-conducting silicone oil and a heat stabilizer into the graphene dispersion liquid, ultrasonically dispersing for 15min, adding a catalyst and a coupling agent, and ultrasonically dispersing for 45min at 50 ℃ to obtain a graphene-aluminum powder mixture;
4) And after taking the coated substrate and spraying a layer of paraffin, scraping the graphene-aluminum powder mixture on the surface of the coated substrate, wherein the scraping thickness is 5mm, the scraping speed is 2m/min, sequentially conveying the coated substrate into a curing box for curing, the curing temperature is 85 ℃, the curing time is 28min, reducing and sintering the coated substrate in a tubular furnace for 2h at 110 ℃, performing secondary sintering for 50min at 185 ℃, and cooling to obtain the graphite-aluminum composite heat dissipation material.
In this embodiment, the coated substrate is a galvanized sheet.
Example 4
The embodiment of the invention provides a graphite aluminum composite heat dissipation material, which comprises the following raw materials in parts by weight:
35 parts of graphene; 55 parts of aluminum powder; 14 parts of cellulose nanofibrils; 40 parts of dispersion base liquid; 15 parts of heat-conducting silicone oil; 8 parts of a heat stabilizer; 10 parts of a catalyst; 8 parts of a cross-linking agent; 20 parts of paraffin.
In this embodiment, the dispersion base solution is prepared by mixing polyvinyl alcohol and polyvinyl formal according to a mass ratio of 1:1, and adding 95% ethanol according to a mass ratio of 1:1.25 after mixing, and mixing uniformly.
In this embodiment, the heat stabilizer is hydrotalcite; the catalyst is niobium oxide; the cross-linking agent is glutaraldehyde.
Referring to fig. 1, a preparation method of a graphite aluminum composite heat dissipation material comprises the following steps:
1) Weighing graphene, aluminum powder, cellulose nanofibrils, dispersion base liquid, heat conduction silicone oil, heat stabilizer, catalyst, coupling agent and paraffin according to parts by weight for standby;
2) Adding graphene and cellulose nanofibrils into a dispersion base liquid, and performing ultrasonic dispersion for 25min to form a graphene dispersion liquid;
3) Adding 110-mesh aluminum powder, heat-conducting silicone oil and a heat stabilizer into the graphene dispersion liquid, ultrasonically dispersing for 15min, adding a catalyst and a coupling agent, and ultrasonically dispersing for 45min at 60 ℃ to obtain a graphene-aluminum powder mixture;
4) And after taking the coated substrate and spraying a layer of paraffin, scraping the graphene-aluminum powder mixture on the surface of the coated substrate, wherein the scraping thickness is 8mm, the scraping speed is 2.5m/min, sequentially conveying the coated substrate into a curing box for curing, the curing temperature is 90 ℃, the curing time is 27min, carrying out reduction sintering for 1h at 105 ℃ in a tubular furnace, carrying out secondary sintering for 50min at 190 ℃, and cooling to obtain the graphite-aluminum composite heat dissipation material.
In this embodiment, the coated substrate is a stainless steel plate.
Example 5
The embodiment of the invention provides a graphite aluminum composite heat dissipation material, which comprises the following raw materials in parts by weight:
40 parts of graphene; 60 parts of aluminum powder; 15 parts of cellulose nanofibrils; 45 parts of dispersion base liquid; 17 parts of heat-conducting silicone oil; 10 parts of a heat stabilizer; 12 parts of a catalyst; 10 parts of a cross-linking agent; 24 parts of paraffin.
In this embodiment, the dispersion base solution is prepared by mixing polyvinyl alcohol and polyvinyl formal according to a mass ratio of 1:1, and adding 95% ethanol according to a mass ratio of 1:1.25 after mixing, and mixing uniformly.
In this embodiment, the heat stabilizer is a copper salt stabilizer; the catalyst is cerium oxide; the cross-linking agent is polyvinylpyrrolidone.
Referring to fig. 1, a preparation method of a graphite aluminum composite heat dissipation material comprises the following steps:
1) Weighing graphene, aluminum powder, cellulose nanofibrils, dispersion base liquid, heat conduction silicone oil, heat stabilizer, catalyst, coupling agent and paraffin according to parts by weight for standby;
2) Adding graphene and cellulose nanofibrils into a dispersion base liquid, and performing ultrasonic dispersion for 25min to form a graphene dispersion liquid;
3) Adding 120-mesh aluminum powder, heat-conducting silicone oil and a heat stabilizer into the graphene dispersion liquid, ultrasonically dispersing for 15min, adding a catalyst and a coupling agent, and ultrasonically dispersing for 45min at 65 ℃ to obtain a graphene-aluminum powder mixture;
4) And after taking the coated substrate and spraying a layer of paraffin, scraping the graphene-aluminum powder mixture on the surface of the coated substrate, wherein the scraping thickness is 10mm, the scraping speed is 1m/min, sequentially conveying the coated substrate into a curing box for curing, the curing temperature is 95 ℃, the curing time is 25min, reducing and sintering the coated substrate in a tubular furnace for 2h at 110 ℃, performing secondary sintering for 50min at 230 ℃, and cooling to obtain the graphite-aluminum composite heat dissipation material.
In this embodiment, the coated substrate is a steel plate.
Comparative example 1
Substantially the same as in example 1, except that the addition of cellulose nanofibrils was omitted.
Comparative example 2
Substantially the same as in example 1, except that the addition of the heat conductive silicone oil was canceled.
Comparative example 3
Substantially the same as in example 1, except that the aluminum powder was replaced with an equal amount of graphene.
And (3) effect verification:
the graphite-aluminum composite heat-dissipating material prepared in examples 1 to 5 and comparative examples 1 to 3 were subjected to tensile strength test and thermal conductivity test, wherein the tensile strength test is referred to GB/T21921-2008, the thermal conductivity test is referred to GB/T22588-2008, and tensile test is performed by a universal experimental stretcher at a tensile rate of 0.5mm/min, and the detection results are as follows.
Table 1 results of testing graphite aluminum composite heat sink materials
As can be seen from Table 1, the graphite aluminum composite heat dissipation material prepared by the invention has excellent tensile strength and heat conductivity coefficient, and the comprehensive effect is far higher than that of the composite heat dissipation material of the comparative example.
From the results, the graphene and aluminum powder are used as raw materials, and a proper amount of cellulose nanofibrils are added, so that the cellulose nanofibrils are lighter than steel by 1/5, the strength is 5 times that of the steel, the linear thermal expansion is small, the overall toughness of the graphene-aluminum composite heat dissipation material can be ensured while the graphene consumption is reduced, and the production cost of the graphene-aluminum composite heat dissipation material is reduced. The proper amount of heat conduction silicone oil is added, so that the heat conduction performance of the graphite-aluminum composite heat dissipation material is improved, the composition of graphene and aluminum is realized after the heat conduction performance is coated, solidified and sintered, the graphene can be uniformly dispersed in aluminum powder to form a graphene-aluminum powder mixture, the heat conduction performance of the graphite-aluminum composite heat dissipation material is improved after the heat conduction performance is molded, and the tensile strength of pure aluminum is improved.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. The graphite aluminum composite heat dissipation material is characterized by comprising the following raw materials in parts by weight:
25-40 parts of graphene; 35-60 parts of aluminum powder; 9-15 parts of cellulose nanofibrils; 30-45 parts of dispersion base liquid; 10-17 parts of heat-conducting silicone oil; 5-10 parts of a heat stabilizer; 6-12 parts of a catalyst; 5-10 parts of cross-linking agent; 15-24 parts of paraffin.
2. The graphite aluminum composite heat sink material according to claim 1, wherein the graphite aluminum composite heat sink material comprises the following raw materials in parts by weight: 35 parts of graphene; 50 parts of aluminum powder; 13 parts of cellulose nanofibrils; 37 parts of dispersion base liquid; 14 parts of heat-conducting silicone oil; 7 parts of a heat stabilizer; 9 parts of a catalyst; 8 parts of a cross-linking agent; 20 parts of paraffin.
3. The graphite-aluminum composite heat-dissipating material according to claim 1 or 2, wherein the dispersion base liquid is prepared by mixing polyvinyl alcohol and polyvinyl formal according to a mass ratio of 1:1, and adding 95% ethanol according to a mass ratio of 1:1.25 after mixing, and uniformly mixing.
4. The graphite aluminum composite heat sink material according to claim 1 or 2, wherein the heat stabilizer is any one of a copper salt stabilizer, a calcium zinc composite stabilizer, cuprous iodide or hydrotalcite.
5. The graphite aluminum composite heat sink material according to claim 1 or 2, wherein the catalyst is one of cerium oxide, barium oxide, praseodymium oxide and niobium oxide.
6. The graphite aluminum composite heat sink material according to claim 1 or 2, wherein the cross-linking agent is one of polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, glutaraldehyde, butyraldehyde.
7. A method for preparing the graphite aluminum composite heat dissipation material as recited in any one of claims 1 to 6, characterized by comprising the following steps:
1) Weighing graphene, aluminum powder, cellulose nanofibrils, dispersion base liquid, heat conduction silicone oil, heat stabilizer, catalyst, coupling agent and paraffin according to parts by weight for standby;
2) Adding graphene and cellulose nanofibrils into a dispersion base liquid, and performing ultrasonic dispersion for 10-25min to form a graphene dispersion liquid;
3) Adding 80-120 mesh aluminum powder, heat conduction silicone oil and a heat stabilizer into the graphene dispersion liquid, ultrasonically dispersing for 15min, adding a catalyst and a coupling agent, and ultrasonically dispersing for 45min at 35-65 ℃ to obtain a graphene-aluminum powder mixture;
4) And after the coating substrate is taken and a layer of paraffin is sprayed, the graphene-aluminum powder mixture is coated on the surface of the coating substrate in a scraping mode, the thickness of the coating is 1-10mm, the coating is sequentially conveyed into a curing box for curing, the curing box is sintered in a tube furnace, and the coating is taken out after sintering molding, so that the graphite-aluminum composite heat dissipation material is prepared.
8. The method for preparing a graphite aluminum composite heat sink material according to claim 7, wherein in the step 4), a doctor-blading speed of the graphene aluminum powder mixture doctor-coated on the surface of the coated substrate is 1-3m/min; the curing is carried out in a curing box at 70-95 ℃ for 25-30min.
9. The method for preparing the graphite-aluminum composite heat-dissipating material according to claim 8, wherein in the step 4), when the graphene-aluminum powder mixture coated on the surface of the coated substrate is sintered, the reduction sintering is performed for 1-2 hours at 95-110 ℃, the secondary sintering is performed for 50 minutes at 110-230 ℃, and the graphite-aluminum composite heat-dissipating material is obtained after cooling.
10. The method of claim 7, wherein the coated substrate is one of a steel plate, an aluminized zinc plate, a galvanized plate, and a stainless steel plate. .
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