CN112980202A - Biodegradable biomass-based composite heat conduction material and preparation method thereof - Google Patents
Biodegradable biomass-based composite heat conduction material and preparation method thereof Download PDFInfo
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- CN112980202A CN112980202A CN202110169207.1A CN202110169207A CN112980202A CN 112980202 A CN112980202 A CN 112980202A CN 202110169207 A CN202110169207 A CN 202110169207A CN 112980202 A CN112980202 A CN 112980202A
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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
- C08K3/38—Boron-containing compounds
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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
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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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
- C08K2201/005—Additives being defined by their particle size in general
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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
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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Abstract
The invention discloses a biodegradable biomass-based composite heat conduction material and a preparation method thereof, wherein the preparation method of the material comprises the following steps: placing the biomass high polymer material and the heat-conducting filler into a ball mill for ball milling treatment to obtain a mixtureFeeding; and (3) drying the mixed material in vacuum, adding the dried mixed material into a mold, and performing hot press molding to obtain a final product. The preparation method utilizes the combined action of ball milling and hot pressing to introduce the heat-conducting filler into the biomass high polymer material, so that a heat-conducting path is formed in the prepared product, and the heat conductivity coefficient of the formed composite material exceeds 8Wm‑1k‑1Has high heat conducting performance and can be used as a heat management material. In addition, the preparation method of the material is simple, the raw material source is rich, the material is biodegradable, and the material has excellent environmental friendliness.
Description
Technical Field
The invention belongs to the field of heat management materials, and particularly relates to a biodegradable biomass-based composite heat conduction material and a preparation method thereof.
Background
As electronic devices have been developed toward miniaturization, intelligence, and high integration, the amount of heat generated by core components has increased dramatically, and the use and dependence of thermal management materials has increased. The commonly used heat management materials include metal materials, ceramic materials and polymer composite materials, wherein the polymer composite materials are favored because of the advantages of light weight, easy processing and the like. However, the service life of electronic components is limited, and when the electronic components are damaged and lose functions, the electronic components are discarded and become waste, wherein the artificially synthesized polymer composite materials such as plastics and rubber cannot be naturally degraded to cause pollution, and the large-scale use of the base materials brings heavy pressure to the protection of the natural environment.
Disclosure of Invention
The invention aims to make up the defects of the existing materials and provides a biodegradable biomass-based composite heat conduction material and a preparation method thereof; the material has high thermal conductivity, can be biodegraded and has excellent environmental friendliness.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a biodegradable biomass-based composite heat conduction material comprises the following steps:
placing the biomass high polymer material and the heat-conducting filler into a ball mill for ball milling treatment to obtain a mixed material; and (3) after vacuum drying, adding the mixed material into a mold for hot press molding to obtain a final product.
As a preferable technical scheme, the mass ratio of the biomass polymer material to the heat-conducting filler is (4-8): (2-7).
According to a preferable technical scheme, the biomass high polymer material is at least one of fibroin, spidroin and bacterial cellulose. The fibroin and the spidroin contain abundant amino, hydroxyl, carboxyl and other groups, and the existence of the groups is favorable for enhancing the interaction between the heat-conducting filler and the biomass material and reducing the interface thermal resistance; the bacterial cellulose is obtained after bacterial treatment, contains abundant hydroxyl groups, and can enhance the interaction between the heat-conducting filler and the biomass material.
As a preferred technical solution, the heat conductive filler is at least one of a metal material, a heat conductive ceramic filler, graphene, and a carbon nanotube. Further preferably, the metal material is gold powder, silver powder, copper powder, aluminum powder or low-melting-point alloy; the heat-conducting ceramic filler is boron nitride, aluminum oxide, silicon nitride or silicon carbide.
As a preferable technical scheme, the ball milling time is 0.5-3 h; the hot pressing temperature is 100-200 ℃, and the pressure is 15-40 MPa. Specifically, the hot pressing temperature can be 100 deg.C, 150 deg.C or 200 deg.C, and the pressure can be 15MPa, 20MPa, 30MPa or 40 MPa.
The invention also provides the biomass-based composite heat conduction material prepared by the preparation method.
Compared with the prior art, the invention has the beneficial effects that:
the biomass material contains a large amount of hydroxyl and amino, and the surface of the heat-conducting filler is subjected to hydroxylation reaction under the action of friction force and shearing force generated by ball-milling mixing, so that the interaction between the heat-conducting filler and the biomass material is enhanced, the interface thermal resistance between the heat-conducting filler and the biomass material is reduced, and meanwhile, the heat-conducting filler is uniformly distributed in the mixed material to form a continuous heat-conducting network. During the hot pressing, the biomass material is heatedAnd the raw plastic fills the gap defects which can cause phonon scattering in the mixed material. Under the action of pressure and temperature, the mixed material becomes more compact, the contact between the heat-conducting fillers is tighter, and the heat-conducting path is further improved; the heat conductivity coefficient of the formed composite material exceeds 8Wm-1k-1Has high heat conducting performance and can be used as a heat management material. In addition, the preparation method of the material is simple, the raw material source is rich, the material is biodegradable, and the material has excellent environmental friendliness.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
70g of fibroin powder and 30g of hexagonal boron nitride with the particle size of 15 mu m are added into a ball milling tank for ball milling at one time. Ball milling conditions: the rotation speed is 521 rpm, the rotation speed is positive for 30 minutes, the rest is 30 minutes, and the rotation speed is negative for 30 minutes. After ball milling, the mixture was dried in a vacuum oven at 60 ℃ for 12 hours. The dried mixed powder was charged into a cylindrical mold having a diameter of 25 mm. Then hot-press molding is carried out by using a flat vulcanizing machine, wherein the hot-press condition is as follows: preheating at 150 ℃/30 min (preheating), cooling at 150 ℃/20MPa/60 min (hot pressing) for 10 min to obtain the final product. The thermal conductivity of the product was measured to be 1.1Wm-1k-1。
Example 2
60g of fibroin powder and 40g of hexagonal boron nitride with the particle size of 15 mu m are added into a ball milling tank for ball milling at one time. Ball milling conditions: the rotation speed is 521 rpm, the rotation speed is 90 minutes, the rest is 30 minutes, and the rotation speed is 90 minutes. After ball milling, the mixture was dried in a vacuum oven at 60 ℃ for 12 hours. The dried mixed powder was added to a cylindrical mold having a diameter of 25 mm. Then hot-press molding is carried out by using a flat vulcanizing machine, wherein the hot-press condition is as follows: 150 ℃/30 min (preheat) +150 ℃/20MPa/60 min (hot press) +10 min cooling.Measured thermal conductivity coefficient of 1.83Wm-1k-1。
Example 3
50g of fibroin powder and 50g of hexagonal boron nitride with the particle size of 15 mu m are added into a ball milling tank for ball milling at one time. Ball milling conditions: the rotation speed is 521 rpm, the rotation speed is 90 minutes, the rest is 30 minutes, and the rotation speed is 90 minutes. After ball milling, the mixture was dried in a vacuum oven at 60 ℃ for 12 hours. The dried mixed powder was added to a cylindrical mold having a diameter of 25 mm. Then hot-press molding is carried out by using a flat vulcanizing machine, wherein the hot-press condition is as follows: 150 ℃/30 min (preheat) +150 ℃/20MPa/60 min (hot press) +10 min cooling. Measured thermal conductivity coefficient of 3.18Wm-1k-1。
Example 4
50g of fibroin powder and 50g of hexagonal boron nitride with the particle size of 25 mu m are added into a ball milling tank for ball milling at one time. Ball milling conditions: the rotation speed is 521 rpm, the rotation speed is 90 minutes, the rest is 30 minutes, and the rotation speed is 90 minutes. After ball milling, the mixture was dried in a vacuum oven at 60 ℃ for 12 hours. The dried mixed powder was added to a cylindrical mold having a diameter of 25 mm. Then hot-press molding is carried out by using a flat vulcanizing machine, wherein the hot-press condition is as follows: 150 ℃/30 min (preheat) +150 ℃/20MPa/60 min (hot press) +10 min cooling. Measured thermal conductivity coefficient was 5.55Wm-1k-1。
Example 5
50g of fibroin powder and 60g of hexagonal boron nitride with the particle size of 50 mu m are added into a ball milling tank for ball milling at one time. Ball milling conditions: the rotation speed is 521 rpm, the rotation speed is 90 minutes, the rest is 30 minutes, and the rotation speed is 90 minutes. After ball milling, the mixture was dried in a vacuum oven at 60 ℃ for 12 hours. The dried mixed powder was added to a cylindrical mold having a diameter of 25 mm. Then hot-press molding is carried out by using a flat vulcanizing machine, wherein the hot-press condition is as follows: 150 ℃/30 min (preheat) +150 ℃/20MPa/60 min (hot press) +10 min cooling. Measured thermal conductivity coefficient of 8.01Wm-1k-1。
Comparative example
100g of fibroin powder is taken and added into a ball milling tank for ball milling at one time. Ball milling conditions: rotation speed 521 rpm, positiveTurn for 90 minutes, rest for 30 minutes, and turn for 90 minutes. After ball milling, the fibroin powder was dried in a vacuum oven at 60 ℃ for 12 hours. The dried fibroin powder was added to a cylindrical mold with a diameter of 25 mm. Then hot-press molding is carried out by using a flat vulcanizing machine, wherein the hot-press condition is as follows: 150 ℃/30 min (preheat) +150 ℃/20MPa/60 min (hot press) +10 min cooling. Measured thermal conductivity coefficient of 0.23Wm-1k-1. Comparing the test results of examples 1-5 and the comparative example, it can be seen that the thermal conductivity of fibroin can be significantly improved by mixing fibroin with a thermal conductive filler, and performing appropriate ball milling and hot pressing, and the prepared material can be used as a thermal management material.
Claims (8)
1. A preparation method of a biodegradable biomass-based composite heat conduction material is characterized by comprising the following steps: the method comprises the following steps:
placing the biomass high polymer material and the heat-conducting filler into a ball mill for ball milling treatment to obtain a mixed material; and (3) after vacuum drying, adding the mixed material into a mold for hot press molding to obtain a final product.
2. The method of claim 1, wherein: the mass ratio of the biomass high polymer material to the heat-conducting filler is (4-8): (2-7).
3. The method of claim 2, wherein: the biomass high polymer material is at least one of fibroin, spidroin and bacterial cellulose.
4. The method of claim 2, wherein: the heat-conducting filler is at least one of a metal material, a heat-conducting ceramic filler, graphene and a carbon nano tube.
5. The method of claim 4, wherein: the metal material is gold powder, silver powder, copper powder, aluminum powder or low-melting-point alloy.
6. The method of claim 4, wherein: the heat-conducting ceramic filler is boron nitride, aluminum oxide, silicon nitride or silicon carbide.
7. The method of claim 1, wherein: the ball milling time is 0.5-3 h; the hot pressing temperature is 100-200 ℃, and the pressure is 15-40 MPa.
8. The biomass-based composite heat conduction material prepared by the preparation method according to any one of claims 1 to 7.
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| CN202110169207.1A CN112980202A (en) | 2021-02-07 | 2021-02-07 | Biodegradable biomass-based composite heat conduction material and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103467889A (en) * | 2013-09-16 | 2013-12-25 | 广西大学 | Method for preparing heat conductive composite material by mechanical activation and intensification |
| CN105731435A (en) * | 2016-01-25 | 2016-07-06 | 浙江碳谷上希材料科技有限公司 | High-strength flexible graphene composite heat conduction film and preparation method thereof |
| CN110408083A (en) * | 2019-08-29 | 2019-11-05 | 四川大学 | It is a kind of using bacteria cellulose as high-heat-conductive composite material of matrix and preparation method thereof |
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- 2021-02-07 CN CN202110169207.1A patent/CN112980202A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103467889A (en) * | 2013-09-16 | 2013-12-25 | 广西大学 | Method for preparing heat conductive composite material by mechanical activation and intensification |
| CN105731435A (en) * | 2016-01-25 | 2016-07-06 | 浙江碳谷上希材料科技有限公司 | High-strength flexible graphene composite heat conduction film and preparation method thereof |
| CN110408083A (en) * | 2019-08-29 | 2019-11-05 | 四川大学 | It is a kind of using bacteria cellulose as high-heat-conductive composite material of matrix and preparation method thereof |
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