CN110591364A - Flexible composite heat conduction material and heat radiator of wearable equipment - Google Patents
Flexible composite heat conduction material and heat radiator of wearable equipment Download PDFInfo
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- CN110591364A CN110591364A CN201910929392.2A CN201910929392A CN110591364A CN 110591364 A CN110591364 A CN 110591364A CN 201910929392 A CN201910929392 A CN 201910929392A CN 110591364 A CN110591364 A CN 110591364A
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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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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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
- C08K3/04—Carbon
- C08K3/041—Carbon nanotubes
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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
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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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
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
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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
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Abstract
The invention relates to the field of heat dissipation materials, and discloses a flexible composite heat conduction material and a radiator of wearable equipment, wherein the flexible composite heat conduction material comprises a polymer aggregate, a filler and an additive, the filler is a mixture of graphene and carbon nano tubes subjected to surface treatment by a coupling agent, the size of the graphene is 0.05-50 micrometers, the length of the carbon nano tubes is 0.5-20 micrometers, and the mass ratio of the graphene to the carbon nano tubes is (1-10): 1, the coupling agent is a silane coupling agent, a phthalate coupling agent and an aluminate coupling agent. Therefore, the coupling agent can improve the dispersion effect of the filler in the polymer and improve the heat conduction capability of the composite heat conduction material, and the graphene and the carbon nano tubes filled in the flexible heat conduction material can form a composite heat conduction network, so that the heat conduction capability of the composite heat conduction material can be further improved.
Description
Field of the method
The invention belongs to the field of heat dissipation materials, and particularly relates to a flexible composite heat conduction material and a heat radiator of wearable equipment.
Background
The wearable equipment generates more and more heat, the density of devices integrated by the wearable equipment is remarkably improved in recent years due to the reduction of the volume of the equipment and the increase of devices integrated by the equipment, meanwhile, along with the failure of the Dender scaling law, the power density of a chip is continuously increased along with the improvement of the process technology, and the increase of the device density and the power density is used for stipulating that the wearable equipment needs to process more and more heat. Due to the phenomenon of low-temperature burn, the safe temperature threshold of the wearable device which is in direct contact with the human body for a long time is different from the device which is not in direct contact with the human body and the device which is in short-time contact with the human body, and the human body can be burnt at the temperature of more than 43 ℃ within 8 hours of contact time.
The wearable device lacks limited heat dissipation means, and the thermal conductivity of ordinary polymer is too low, is difficult to be used in the heat dissipation process of wearable device, and passive heat dissipation through between equipment shell and the air is the only heat dissipation way of most equipment, and the recent years do not have any improvement and promotion, are limited by limited surface area of equipment and the relatively poor radiating effect of passive heat dissipation, and the whole radiating effect of wearable device is very poor.
The thermal conductivity of the composite material can be improved by adding a filler with high thermal conductivity to the polymer matrix. Due to the ultrahigh thermal conductivity of carbon-based nano materials such as graphene and carbon nano tubes, the application prospect of the carbon-based nano materials in the field of thermal management is huge. But at present, graphene and carbon nanotubes are easy to agglomerate in polymers, and a heat conduction network is difficult to construct; meanwhile, when the filling amount is too high, the flexibility of the polymer is damaged, and the factors cause that the thermal conductivity of the polymer is difficult to be obviously improved by filling too much carbon-based nano material.
In view of the above problems, there is a need to develop a flexible composite heat conductive material suitable for wearable devices.
Disclosure of Invention
The invention aims to provide a flexible composite heat conduction material suitable for wearable equipment, wherein the filler of the flexible composite heat conduction material comprises graphene and carbon nano tubes which are subjected to surface treatment by using a coupling agent, the coupling agent can enable the filler to be better dispersed in a polymer, and the composite material can realize higher heat conduction performance and mechanical performance under the condition of smaller filling concentration through the synergistic effect of the graphene and the carbon nano tubes.
In one aspect of the present invention, the present invention provides a flexible composite heat conductive material, comprising: the composite material comprises a polymer aggregate, a filler and an additive, wherein the filler is a mixture of graphene and carbon nano tubes subjected to surface treatment by a coupling agent. In addition, the flexible composite heat conduction material has excellent heat conduction performance and mechanical performance by adopting the filler, and compared with a metal material, the flexible composite material has the advantages of being light and flexible.
According to the flexible composite heat conduction material disclosed by the embodiment of the invention, the mixture of graphene and carbon nano tubes subjected to surface treatment by the coupling agent is used in the filler, and the graphene and the carbon nano tubes can be better dispersed in the polymer by the treatment of the coupling agent, so that the heat conduction capability and the mechanical property of the composite material are improved; the graphene and the carbon nano tube can construct a composite heat conduction channel, so that the heat conduction capability of the composite material is further improved.
In addition, the flexible composite heat conduction material according to the above embodiment of the present invention may also have the following additional technical features:
in some embodiments of the invention, the graphene is 0.05 to 50 microns in size; the length of the carbon nano tube is 0.5-20 micrometers.
In some embodiments of the present invention, the mass ratio of the graphene to the carbon nanotubes is (1-10): 1, thereby, the heat conductivity of the flexible composite material can be further improved.
In some embodiments of the invention, the polymer matrix comprises: natural rubber, polyisoprene, organosiloxane polymers, acrylonitrile butadiene, polychloroprene, polyacrylic, butyl rubber, fluororubber, water-based polyester polyurethane, water-based polyether polyurethane, or combinations thereof. Therefore, the performance of the composite material can be further improved while the flexibility of the material is ensured.
In some embodiments of the present invention, the filler is added in an amount of 1 to 50 wt% of the composite material. Therefore, the heat conduction capability of the flexible composite heat conduction material can be further improved.
In some embodiments of the present invention, the additive is at least one of a flame retardant and a plasticizer. Therefore, the performance of the flexible composite heat conduction material can be further improved.
The flame retardant is at least one selected from magnesium hydroxide, aluminum hydroxide, red phosphorus master batch, melamine cyanurate complex salt and chlorinated polyethylene. Therefore, the performance of the flexible composite heat conduction material can be further improved.
In some embodiments of the present invention, the plasticizer is at least one selected from the group consisting of phthalate plasticizers, terephthalate plasticizers, benzene polyacid ester plasticizers, benzoate plasticizers, polyol ester plasticizers, chlorinated hydrocarbon plasticizers, epoxy plasticizers, citrate plasticizers, and polyester plasticizers. Therefore, the performance of the flexible composite heat conduction material can be further improved.
In yet another aspect of the present invention, a heat sink is provided. According to the embodiment of the invention, the heat radiator is prepared from the flexible composite heat conduction material. Therefore, the radiator has excellent heat dissipation capacity and mechanical performance, and compared with a traditional metal radiator, the radiator has the advantages of being light and flexible.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a thermal conductive network in which graphene and carbon nanotubes are dispersed in a polymer.
Detailed Description
In order to embody the feasibility and the superiority of the present invention, the following detailed description will be given of examples of the present invention. It is to be understood that the described examples are only some, but not all, examples of the invention. All other examples, which can be obtained by a person of ordinary skill in the art without any inventive step based on the examples given herein, are within the scope of the present invention.
In one aspect of the invention, a flexible composite thermally conductive material is provided. According to an embodiment of the present invention, the flexible composite heat conductive material comprises: the composite material comprises a polymer aggregate, a filler and an additive, wherein the filler is a mixture of graphene and carbon nano tubes subjected to surface treatment by a coupling agent. In addition, this flexible composite heat conduction material makes it have excellent heat conductivility and mechanical properties through adopting complaining the filler, and the flexible composite of this application has light, has flexible advantage simultaneously for metal material.
According to one embodiment of the invention, the flexible composite heat conduction material uses a mixture of graphene and carbon nanotubes subjected to surface treatment by a coupling agent in a filler, wherein the size of the graphene is 0.05-50 micrometers; the length of the carbon nano tube is 0.5-20 micrometers; the graphene and the carbon nano tube can be better dispersed in the polymer by the treatment of the coupling agent, so that the heat conductivity and the mechanical property of the composite material are improved; the graphene and the carbon nano tube can construct a composite heat conduction channel, so that the heat conduction capability of the composite material is further improved.
According to one embodiment of the invention, the mass ratio of the graphene to the carbon nanotubes is (1-10): the inventors have found that the use of this mixing ratio allows the flexibility to be optimized for the thermal conductivity and mechanical properties of the material.
According to one embodiment of the invention, the filler is added into the composite heat conduction material in an amount of 1-50 wt% of the composite material. The inventor finds that the graphene and the carbon nano tubes can be uniformly dispersed in the polymer matrix by adopting the mixing ratio, so that the obtained composite material has excellent heat conducting property, excellent mechanical property and no influence on the chemical stability of the composite material and the flexibility of the flexible composite heat conducting material.
According to another embodiment of the present invention, in the composite heat conductive material, the polymer matrix may be natural rubber, polyisoprene, organosiloxane polymer, acrylonitrile-butadiene, polychloroprene, polyacrylic acids, butyl rubber, fluororubber, water-based polyester polyurethane, water-based polyether polyurethane, or a combination thereof. The inventor finds that by adopting the polymer matrix of the type to match with the mixture of the graphene and the carbon nano tube subjected to the surface treatment by the coupling agent, the obtained composite material has the advantages of optimal heat conducting performance and mechanical property, good formability, and excellent heat dissipation performance, so that the long service life of the radiator can be ensured.
According to an embodiment of the present invention, the plasticizer used may be at least one selected from the group consisting of phthalate plasticizers, terephthalate plasticizers, benzene polyacid ester plasticizers, benzoate plasticizers, polyol ester plasticizers, chlorinated hydrocarbon plasticizers, epoxy plasticizers, citrate plasticizers and polyester plasticizers. The inventors found that the processability of the heat-conducting composite material can be significantly improved by adding such a plasticizer.
According to another embodiment of the present invention, the flame retardant used above may be selected from magnesium hydroxide, aluminum hydroxide, red phosphorus masterbatch, melamine cyanurate complex salt and chlorinated polyethylene. The inventor finds that the combustion-supporting performance of the heat-conducting composite material can be obviously improved by adding the combustion-supporting agent.
In a second aspect of the invention, a heat sink is provided. According to an embodiment of the invention, the heat radiator is prepared from the heat conducting composite material. Therefore, the radiator has excellent heat radiation performance and mechanical property, and compared with a radiator made of metal parts, the radiator has the advantages of being light and flexible. It should be noted that the features and advantages described above for the thermally conductive composite material are also applicable to the heat sink, and are not described in detail here.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
Mixing 0.15g of graphene, 0.05g of carbon nano tube, 1g of silane coupling agent KH-570 and 19g of ethanol, performing ultrasonic treatment for 1 hour, adding a proper amount of hydrochloric acid to adjust the pH value of the solution to 3-4, and heating at 100 ℃ until modified graphene and carbon nano tube mixed powder is obtained; mixing 0.2g of modified graphene carbon nanotube mixed powder, 0.02g of phthalate plasticizer and 0.02g of magnesium hydroxide in 30ml of acetone, performing ultrasonic treatment for 30min, adding 8.43g of PDMS monomer, adding a magnetic rotor, stirring, heating at 50 ℃, keeping for 3h, fully evaporating ethanol to obtain PDMS monomer uniformly doped with filler, adding 0.56g of PDMS curing agent, uniformly stirring, and heating at 50 ℃ for 5h to obtain the PDMS composite material uniformly doped with silicon-based coupling agent modified graphene and carbon nanotubes.
Example 2
Mixing 0.45g of graphene, 0.15g of carbon nano tube, 3g of silane coupling agent KH-570 and 57g of ethanol, performing ultrasonic treatment for 1 hour, adding a proper amount of hydrochloric acid to adjust the pH value of the solution to 3-4, and heating at 100 ℃ until modified graphene and carbon nano tube mixed powder is obtained; mixing 0.6g of modified graphene carbon nanotube mixed powder, 0.02g of phthalate plasticizer and 0.02g of magnesium hydroxide in 30ml of acetone, performing ultrasonic treatment for 30min, adding 8.43g of PDMS monomer, adding a magnetic rotor, stirring, heating at 50 ℃, keeping for 3h, fully evaporating ethanol to obtain PDMS monomer uniformly doped with filler, adding 0.56g of PDMS curing agent, uniformly stirring, and heating at 50 ℃ for 5h to obtain the PDMS composite material uniformly doped with silicon-based coupling agent modified graphene and carbon nanotubes.
Example 3
Mixing 0.75g of graphene, 0.25g of carbon nano tube, 5g of silane coupling agent KH-570 and 95g of ethanol, performing ultrasonic treatment for 1 hour, adding a proper amount of hydrochloric acid to adjust the pH value of the solution to 3-4, and heating at 100 ℃ until modified graphene and carbon nano tube mixed powder is obtained; mixing 1g of modified graphene carbon nanotube mixed powder, 0.02g of phthalate plasticizer and 0.02g of magnesium hydroxide in 30ml of acetone, performing ultrasonic treatment for 30min, adding 8.43g of PDMS monomer, adding a magnetic rotor, stirring, heating at 50 ℃, keeping for 3h, fully evaporating ethanol to obtain PDMS monomer uniformly doped with filler, adding 0.56g of PDMS curing agent, uniformly stirring, and heating at 50 ℃ for 5h to obtain the PDMS composite material uniformly doped with silicon-based coupling agent modified graphene and carbon nanotubes.
Comparative experiments were carried out on the flexible composite heat-conductive materials of examples 1 to 3 prepared as described above and on undoped PDMS (comparative example).
The experimental method comprises the following steps: and (3) placing one end of each of the 4 materials on a ceramic heating sheet, adhering the materials by using heat-conducting silica gel, heating the ceramic heating sheet for 5min by applying the same power, and measuring the temperature of the same position of the material.
The temperatures of the four materials were: 40.6 deg.C, 43.9 deg.C, 46.5 deg.C and 34.6 deg.C. It can be seen that the heat conductivity of examples 1-3 is significantly better than that of the comparative example.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
The foregoing is only a preferred embodiment of the present invention, and many variations in the detailed description and the application range can be made by those skilled in the art without departing from the spirit of the present invention, and all changes that fall within the protective scope of the invention are therefore considered to be within the scope of the invention.
Claims (5)
1. A flexible composite thermally conductive material, comprising: polymer aggregates, fillers and additives; the filler is a mixture of graphene and carbon nanotubes subjected to surface treatment by a coupling agent; the coupling agent is a silane coupling agent, a phthalate coupling agent and an aluminate coupling agent; the size of the graphene is 0.05-50 microns; the length of the carbon nano tube is 0.5-20 micrometers; the mass ratio of the graphene to the carbon nano tube is (1-10): 1.
2. the flexible composite thermally conductive material of claim 1, wherein the polymers collectively are: natural rubber, polyisoprene, organosiloxane polymers, acrylonitrile butadiene, polychloroprene, polyacrylic, butyl rubber, fluororubber, water-based polyester polyurethane, water-based polyether polyurethane, or combinations thereof.
3. The flexible composite heat conducting material according to claim 1, wherein the filler is added in an amount of 1 to 50 wt% of the composite material.
4. The flexible composite thermal conductive material of claim 1, wherein the additive is at least one of a flame retardant, a plasticizer; the flame retardant is at least one selected from magnesium hydroxide, aluminum hydroxide, red phosphorus master batch, melamine cyanurate complex salt and chlorinated polyethylene; the plasticizer is at least one selected from phthalate plasticizers, terephthalate plasticizers, benzene polyacid esters plasticizers, benzoate plasticizers, polyol esters plasticizers, chlorinated hydrocarbon plasticizers, epoxy plasticizers, citrate plasticizers and polyester plasticizers.
5. A heat sink, characterized in that the heat sink is made of the flexible composite heat conduction material as claimed in any one of claims 1-4.
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| CN201910929392.2A CN110591364A (en) | 2019-09-27 | 2019-09-27 | Flexible composite heat conduction material and heat radiator of wearable equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115044128A (en) * | 2022-05-24 | 2022-09-13 | 国网冀北电力有限公司电力科学研究院 | Heat exchange polyethylene composite material, preparation thereof and heat exchange plastic pipe prepared from same |
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| CN115044128A (en) * | 2022-05-24 | 2022-09-13 | 国网冀北电力有限公司电力科学研究院 | Heat exchange polyethylene composite material, preparation thereof and heat exchange plastic pipe prepared from same |
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Application publication date: 20191220 |