CN111117063A - High-thermal-conductivity composite material and preparation and application thereof - Google Patents
High-thermal-conductivity composite material and preparation and application thereof Download PDFInfo
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- CN111117063A CN111117063A CN201911314925.2A CN201911314925A CN111117063A CN 111117063 A CN111117063 A CN 111117063A CN 201911314925 A CN201911314925 A CN 201911314925A CN 111117063 A CN111117063 A CN 111117063A
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- 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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- 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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- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention discloses a high-thermal-conductivity composite material and preparation and application thereof; belongs to the field of heat conducting composite material. The invention mixes the two-dimensional nano material, the liquid metal and the holocellulose nano fiber in water, then places the mixed solution in an ultrasonic cell crusher, carries out ultrasonic treatment on the mixed solution, and finally obtains the heat-conducting filler through centrifugation and drying. And then, dispersing the obtained heat-conducting filler in a polymer matrix to prepare the high-heat-conducting composite material. The high-thermal-conductivity composite material disclosed by the invention has good mechanical property, excellent thermal conductivity and excellent flexibility, and can be widely applied to heat dissipation of electronic components, printed electronics and 5G communication equipment.
Description
Technical Field
The invention relates to the field of heat-conducting composite materials, in particular to a high-heat-conducting composite material and preparation and application thereof.
Background
With the development of modern electronic components, integration, miniaturization and functionalization become the development trend of future advanced electronic components. At the same time, this trend also places higher demands on the dissipation of heat generated by electronic components. The heat dissipation of the electronic components by adopting the heat-conducting composite material is the most common and effective method for the electronic components at present. Therefore, in order to better adapt to the development trend of electronic components, the development of composite materials with higher thermal conductivity is needed.
At present, with the development of nanomaterials, particularly two-dimensional nanomaterials represented by graphene, and the emergence of the nanomaterials, the development trend of heat-conducting composite materials is influenced extremely deeply by virtue of unique physicochemical properties of the nanomaterials, and more two-dimensional nanomaterials are used as fillers, such as: graphene, boron nitride nanosheets, aluminum nitride nanosheets and the like, and a series of high-thermal-conductivity composite materials are developed. However, in the current development situation, due to the large interface thermal resistance between the filler and between the filler and the matrix, the heat conductivity of the composite material is not greatly improved, and the development of the high heat conductivity composite material is hindered.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provides a high-thermal-conductivity composite material and preparation and application thereof. The defect of poor heat conduction performance caused by large interface thermal resistance between the existing heat conduction material filler and the filler and between the filler and the matrix is solved. The high-thermal-conductivity composite material disclosed by the invention has good mechanical properties, excellent thermal conductivity and excellent flexibility.
The invention is realized by the following technical scheme:
a preparation method of a high-thermal-conductivity composite material comprises the steps of mixing a two-dimensional nano material, liquid metal and holocellulose nano fibers in water, then placing a mixed solution in an ultrasonic cell disruption instrument, carrying out ultrasonic treatment on the mixed solution, and finally centrifuging and drying to obtain a thermal-conductivity filler; and then dispersing the heat-conducting filler in the polymer matrix to prepare the high-heat-conducting composite material.
The high-thermal-conductivity composite material is holocellulose nanofiber, and the preparation process comprises the following steps:
taking 500g of sodium chlorite aqueous solution with the mass fraction of 1.5%, adjusting the pH value to 4 by adopting acetic acid, then adding 0.75g of extracted bagasse, processing for 2 hours at the temperature of 70 ℃, and finally obtaining the holocellulose through suction filtration and washing; uniformly dispersing the obtained holocellulose in water to prepare water dispersible suspension with the mass fraction of 2%, then placing the obtained mixed solution in a slurry fluffer for fluffing for 20000 revolutions, further adding water into the suspension to dilute the suspension into water dispersible suspension with the mass fraction of 0.1%, then homogenizing the suspension for 5 times by a high-pressure homogenizer under the pressure of 20MPa, finally centrifuging the obtained suspension for 10 minutes under the revolution of 3000 revolutions, reserving the upper suspension, and drying the suspension for 4 hours under the vacuum condition at the temperature of 65 ℃; namely the holocellulose nano-fiber.
The ultrasonic treatment condition is that the ultrasonic power is 450-1800W, and the ultrasonic time is 30-240 minutes;
the centrifugation and drying conditions are that centrifugation is carried out for 20 minutes at 2000 revolutions, and vacuum drying is carried out for 4 hours at 65 ℃.
The two-dimensional nano material is one of graphene, boron nitride nanosheets, aluminum nitride nanosheets, molybdenum disulfide, transition metal carbon/nitride (MXene) or tungsten disulfide.
The liquid metal is one of gallium, gallium indium alloy or gallium indium tin alloy.
The mass ratio of the two-dimensional nano material to the liquid metal to the holocellulose nano fiber is 10:10:1, 8:8:1, 6:6:1, 4:4:1, 3:3:1 or 2:2: 1.
The polymer matrix is at least one of polyolefin, polyvinyl chloride, polyester, polycarbonate and polyamide;
the filler is used in an amount such that the mass ratio of filler to polymer matrix is 1:4, 1:3, 1:2, 1:1, 2:1, 3:1, 4:1, 5:1, or 6: 1.
A high thermal conductive composite material, in particular to holocellulose nano-fiber, is obtained by the preparation method.
An application of holocellulose nano-fiber, which is used as a heat dissipation and conduction component in electronic components, printed electronics and 5G communication equipment.
Compared with the prior art, the invention has the following advantages and effects:
(1) the holocellulose nano-fiber used in the invention is used as the most abundant biomass resource in nature, and has the advantages of low price, renewability, easy degradation and the like.
(2) The invention adopts two-dimensional nano materials, realizes good heat transfer orientation arrangement and improves a good heat transfer path for heat dissipation.
(3) The liquid metal is adopted to modify the surface of the two-dimensional nano material, so that the direct heat transfer of the interface is increased, the thermal resistance of the interface is greatly reduced, and the heat transfer efficiency is higher.
(4) The holocellulose nanofibers adopted by the invention are used as fillers between the two-dimensional nanomaterial and the liquid metal, so that the mechanical property and the flexibility of the composite material are greatly improved.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated. Unless otherwise indicated, reagents and materials used in the present invention are commercially available.
Example 1
(1) Mixing graphene, liquid metal gallium and holocellulose nanofibers in water according to a mass ratio of 10:10:1, then placing the mixed solution in an ultrasonic cell disruption instrument, and carrying out ultrasonic treatment on the mixed solution, wherein the ultrasonic power is 450W, and the ultrasonic time is 30 minutes; finally, centrifuging for 20 minutes at 2000 revolutions, and vacuum drying for 4 hours at 65 ℃ to obtain the heat-conducting filler.
(2) And (2) dispersing the heat-conducting filler obtained in the step (1) in polypropylene, wherein the mass ratio of the filler to the polypropylene matrix is 1:4, and preparing the high heat-conducting composite material.
(3) The heat conductivity coefficient of the composite material is 2W/mk through testing, and the tensile strength is 30 Mpa.
Example 2
(1) Mixing boron nitride nanosheets, liquid metal gallium-indium alloy and holocellulose nanofibers in water according to the mass ratio of 6:6:1, then placing the mixed solution in an ultrasonic cell disruption instrument, and carrying out ultrasonic treatment on the mixed solution, wherein the ultrasonic power is 650W, and the ultrasonic time is 60 minutes; finally, centrifuging for 20 minutes at 2000 revolutions, and vacuum drying for 4 hours at 65 ℃ to obtain the heat-conducting filler.
(2) And (2) dispersing the heat-conducting filler obtained in the step (1) in polypropylene, wherein the mass ratio of the filler to the polypropylene chloride matrix is 1:1, and preparing the high heat-conducting composite material.
(3) The heat conductivity coefficient of the composite material is 4W/mk through testing, and the tensile strength is 35 Mpa.
Example 3
(1) Mixing aluminum nitride nanosheets, liquid metal gallium indium tin alloy and holocellulose nanofibers in water according to the mass ratio of 2:2:1, then placing the mixed solution in an ultrasonic cell disruption instrument, and carrying out ultrasonic treatment on the mixed solution, wherein the ultrasonic power is 1800W, and the ultrasonic time is 240 minutes; finally, centrifuging for 20 minutes at 2000 revolutions, and vacuum drying for 4 hours at 65 ℃ to obtain the heat-conducting filler.
(2) And (2) dispersing the heat-conducting filler obtained in the step (1) in polypropylene, wherein the mass ratio of the filler to the polypropylene chloride matrix is 1:1, and preparing the high heat-conducting composite material.
(3) The heat conductivity coefficient of the composite material is 8W/mk through testing, and the tensile strength is 38 MPa.
The high-thermal-conductivity composite material disclosed by the invention has good mechanical property, excellent thermal conductivity and excellent flexibility, and can be widely applied to heat dissipation of electronic components, printed electronics and 5G communication equipment.
The embodiments of the present invention are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (10)
1. A preparation method of a high-thermal-conductivity composite material is characterized by comprising the following steps: mixing a two-dimensional nano material, liquid metal and holocellulose nano fibers in water, then placing the mixed solution in an ultrasonic cell disruption instrument, carrying out ultrasonic treatment on the mixed solution, and finally centrifuging and drying to obtain the heat-conducting filler; and then dispersing the heat-conducting filler in the polymer matrix to prepare the high-heat-conducting composite material.
2. The method for preparing the high thermal conductive composite material according to claim 1, wherein: the high-thermal-conductivity composite material is holocellulose nanofiber, and the preparation process comprises the following steps:
taking 500g of sodium chlorite aqueous solution with the mass fraction of 1.5%, adjusting the pH value to 4 by adopting acetic acid, then adding 0.75g of extracted bagasse, processing for 2 hours at the temperature of 70 ℃, and finally obtaining the holocellulose through suction filtration and washing; uniformly dispersing the obtained holocellulose in water to prepare water dispersible suspension with the mass fraction of 2%, then placing the obtained mixed solution in a slurry fluffer for fluffing for 20000 revolutions, further adding water into the suspension to dilute the suspension into water dispersible suspension with the mass fraction of 0.1%, then homogenizing the suspension for 5 times by a high-pressure homogenizer under the pressure of 20MPa, finally centrifuging the obtained suspension for 10 minutes under the revolution of 3000 revolutions, reserving the upper suspension, and drying the suspension for 4 hours under the vacuum condition at the temperature of 65 ℃; namely the holocellulose nano-fiber.
3. The method for preparing the high thermal conductive composite material according to claim 2, wherein: the ultrasonic treatment condition is that the ultrasonic power is 450-1800W, and the ultrasonic time is 30-240 minutes.
4. The method for preparing the high thermal conductive composite material according to claim 3, wherein: the centrifugation and drying conditions are that centrifugation is carried out for 20 minutes at 2000 revolutions, and vacuum drying is carried out for 4 hours at 65 ℃.
5. The method for preparing the high thermal conductive composite material according to claim 4, wherein: the two-dimensional nano material is one of graphene, boron nitride nanosheets, aluminum nitride nanosheets, molybdenum disulfide, transition metal carbon/nitride or tungsten disulfide.
6. The method for preparing the high thermal conductive composite material according to claim 5, wherein: the liquid metal is one of gallium, gallium indium alloy or gallium indium tin alloy.
7. The method for preparing the high thermal conductive composite material according to claim 6, wherein: the mass ratio of the two-dimensional nano material to the liquid metal to the holocellulose nano fiber is 10:10:1, 8:8:1, 6:6:1, 4:4:1, 3:3:1 or 2:2: 1.
8. The method for preparing the high thermal conductive composite material according to claim 7, wherein: the polymer matrix is at least one of polyolefin, polyvinyl chloride, polyester, polycarbonate and polyamide;
the filler is used in an amount such that the mass ratio of filler to polymer matrix is 1:4, 1:3, 1:2, 1:1, 2:1, 3:1, 4:1, 5:1, or 6: 1.
9. A high thermal conductive composite material, in particular to holocellulose nano-fiber, which is obtained by the preparation method of any one of claims 1 to 8.
10. Use of the holocellulose nanofibers according to claim 9 as heat dissipation and conduction components in electronic components, printed electronics or 5G communication equipment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112759930A (en) * | 2020-12-30 | 2021-05-07 | 四川大学 | Liquid metal/aramid nano-fiber heat-conducting composite material, preparation method and application |
| CN114478925A (en) * | 2022-03-09 | 2022-05-13 | 昆明理工大学 | Preparation method of thin-wall cell cellulose and liquid metal nano-droplet composite membrane |
| CN114525117A (en) * | 2022-03-31 | 2022-05-24 | 四川大学 | High-thermal-conductivity liquid metal/boron nitride composite material and preparation method thereof |
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