CN111718694A - Heat conducting fin and preparation method thereof - Google Patents
Heat conducting fin and preparation method thereof Download PDFInfo
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- CN111718694A CN111718694A CN202010566019.8A CN202010566019A CN111718694A CN 111718694 A CN111718694 A CN 111718694A CN 202010566019 A CN202010566019 A CN 202010566019A CN 111718694 A CN111718694 A CN 111718694A
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- 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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- 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
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- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/38—Boron-containing compounds
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
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- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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Abstract
The invention discloses a heat conducting fin and a preparation method thereof, wherein the heat conducting fin comprises the following raw materials in parts by weight: 20-30 parts of boron nitride particles, 20-30 parts of modified graphene and 50-80 parts of adhesive; the average particle size of the boron nitride particles is 10-30 μm; the adhesive is one or more of polycarbonate, polyamide and polystyrene. According to the invention, the modified graphene is adopted and matched with boron nitride particles, so that the obtained product has better heat-conducting property.
Description
Technical Field
The invention relates to the technical field of heat conduction materials, in particular to a graphene-containing heat conduction sheet and a preparation method thereof.
Background
Graphene (Graphene) is a polymer made of carbon atoms in sp2The hybrid orbit forms a hexagonal single-layer planar film formed by arranging honeycomb lattices (graphene crystal lattice), and graphene is the thinnest and the hardest in the worldA nanomaterial of (2), which is almost completely transparent, absorbing only 2.3% of the light; the thermal conductivity coefficient is as high as 5300W/m.K, and graphene has such excellent physicochemical properties, and has been gradually used in the fields of transparent conductive thin films, nano electronic devices (transistors, transistor circuit interconnection memory semiconductors), conductive inks, solar cells, lithium batteries, supercapacitors, sensors, biomedicine and the like.
Due to the fact that the surface energy of the graphene is extremely large, the graphene is not uniformly dispersed when being compounded with other polymers, and the heat conducting performance of the graphene reinforced heat conducting polymer composite material is reduced. Currently, people improve the thermal conductivity of graphite flakes by plating a metal layer on the graphite flakes and treating the graphite raw material with an acid solution.
Disclosure of Invention
In view of the above problems in the prior art, the present applicant provides a thermally conductive sheet and a method for manufacturing the same. According to the invention, the modified graphene is adopted and matched with boron nitride particles, so that the obtained product has better heat-conducting property.
The technical scheme of the invention is as follows:
the heat conducting fin comprises the following raw materials in parts by weight:
20-30 parts of boron nitride particles;
20-30 parts of modified graphene;
50-80 parts of an adhesive;
the average particle size of the boron nitride particles is 10-30 μm;
the adhesive is one or more of polycarbonate, polyamide and polystyrene;
the preparation method of the modified graphene comprises the following steps:
(1) dispersing graphite and a stripping agent in water, then carrying out mill mixing in a sand mill, and carrying out liquid phase stripping to obtain a graphene dispersion liquid;
(2) mixing a titanate coupling agent and the graphene dispersion liquid by a mill to obtain a modified graphene dispersion liquid; and separating the modified graphene from the modified graphene dispersion liquid to obtain the modified graphene.
The graphite in the step (1) is expanded graphite; the stripping agent is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate; the mass ratio of the graphite to the stripping agent is 2-8: 1, and the mass percentage of the graphite in a mixed liquid formed by the graphite, the stripping agent and water is 2-10%.
In the step (2), the mass of the titanate coupling agent is 1-5% of that of the graphite; the maximum radial dimension of the modified graphene is 2-20 mu m.
The sanding mixing medium of the sanding machine is an oxidation steel ball with the diameter of 0.8-2.0 mm, the mixing time of the sanding machine is 0.5-1 h, and the mixing temperature of the sanding machine is 20-60 ℃;
a method for producing a thermally conductive sheet, comprising: mixing 20-30 parts of boron nitride particles, 20-30 parts of modified graphene and 50-80 parts of adhesive, and then extruding and rolling the mixture into a sheet on an extruder to obtain the heat-conducting sheet.
The beneficial technical effects of the invention are as follows:
according to the invention, the graphite is subjected to a stripping method, so that the preparation and surface modification periods of the graphene can be shortened, and the preparation and modification periods of the graphene can be improved. Meanwhile, the modified graphene, the boron nitride particles and the adhesive are compatible to form a three-dimensional heat conduction network, so that the heat conduction performance and the mechanical property of the heat conduction sheet are improved.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
A method for producing a thermally conductive sheet, comprising: mixing 30 parts of boron nitride particles (with an average particle size of 10-30 microns), 30 parts of modified graphene and 80 parts of polycarbonate, extruding the mixture on an extruder, and rolling the mixture into a sheet to obtain the heat-conducting sheet. The thermal conductivity was 42.3W/mK.
The preparation method of the modified graphene comprises the following steps:
(1) dispersing graphite and sodium dodecyl benzene sulfonate (the mass ratio is 8:1) in water to form a mixed solution with the mass percent of the graphite being 10%, then carrying out mill mixing in a sand mill, and carrying out liquid phase stripping to obtain a graphene dispersion liquid; the sanding mixing medium of the sanding machine is an oxidation steel ball with the diameter of 0.8mm, the mixing time of the sanding machine is 0.5h, and the mixing temperature of the sanding machine is 40 ℃;
(2) mixing a titanate coupling agent (5% of graphite by mass) and the graphene dispersion liquid by a mill, wherein the sand milling mixing medium of the sand mill is an oxidized steel ball with the diameter of 0.8mm, the mixing time of the mill is 0.5h, and the mixing temperature of the mill is 40 ℃ to obtain the modified graphene dispersion liquid; separating the modified graphene from the modified graphene dispersion liquid to obtain modified graphene; the maximum radial dimension of the modified graphene is 2 μm.
Example 2
A method for producing a thermally conductive sheet, comprising: mixing 20 parts of boron nitride particles (with an average particle size of 10-30 microns), 30 parts of modified graphene and 50 parts of polyamide, extruding on an extruder, and rolling into a sheet to obtain the heat-conducting sheet. The thermal conductivity was 45.1W/m.K.
The preparation method of the modified graphene comprises the following steps:
(1) dispersing graphite and sodium dodecyl sulfate (the mass ratio is 6:1) in water to form a mixed solution with the mass percent of the graphite being 8%, then mixing the mixed solution in a grinding machine, and stripping a liquid phase to obtain a graphene dispersion solution; the sanding mixing medium of the sanding machine is an oxidation steel ball with the diameter of 1.0mm, the mixing time of the sanding machine is 1h, and the mixing temperature of the sanding machine is 30 ℃;
(2) carrying out mill mixing on a titanate coupling agent (1% of graphite by mass) and the graphene dispersion liquid, wherein the sand milling mixed medium of a sand mill is an oxidized steel ball with the diameter of 1.0mm, the mill mixing time is 1h, and the mill mixing temperature is 30 ℃ to obtain the modified graphene dispersion liquid; separating the modified graphene from the modified graphene dispersion liquid to obtain modified graphene; the maximum radial dimension of the modified graphene is 10 μm.
Example 3
A method for producing a thermally conductive sheet, comprising: mixing 25 parts of boron nitride particles (with an average particle size of 10-30 microns), 20 parts of modified graphene and 60 parts of polystyrene, extruding on an extruder, and rolling into a sheet to obtain the heat-conducting sheet. The thermal conductivity was 38.2W/mK.
The preparation method of the modified graphene comprises the following steps:
(1) dispersing graphite and sodium dodecyl benzene sulfonate (the mass ratio is 2:1) in water to form a mixed solution with the mass percent of the graphite being 2%, then carrying out mill mixing in a sand mill, and carrying out liquid phase stripping to obtain a graphene dispersion liquid; the sanding mixing medium of the sanding machine is an oxidation steel ball with the diameter of 2.0mm, the mixing time of the sanding machine is 0.5h, and the mixing temperature of the sanding machine is 60 ℃;
(2) carrying out mill mixing on a titanate coupling agent (3% of graphite by mass) and the graphene dispersion liquid, wherein a sand milling mixing medium of a sand mill is an oxidation steel ball with the diameter of 2.0mm, the mixing time of the mill is 0.5h, and the mixing temperature of the mill is 60 ℃ to obtain a modified graphene dispersion liquid; separating the modified graphene from the modified graphene dispersion liquid to obtain modified graphene; the maximum radial dimension of the modified graphene is 20 μm.
Claims (5)
1. A heat conducting fin is characterized by comprising the following raw materials in parts by weight:
20-30 parts of boron nitride particles;
20-30 parts of modified graphene;
50-80 parts of an adhesive;
the average particle size of the boron nitride particles is 10-30 μm;
the adhesive is one or more of polycarbonate, polyamide and polystyrene;
the preparation method of the modified graphene comprises the following steps:
(1) dispersing graphite and a stripping agent in water, then carrying out mill mixing in a sand mill, and carrying out liquid phase stripping to obtain a graphene dispersion liquid;
(2) mixing a titanate coupling agent and the graphene dispersion liquid by a mill to obtain a modified graphene dispersion liquid; and separating the modified graphene from the modified graphene dispersion liquid to obtain the modified graphene.
2. A heat-conductive sheet as claimed in claim 1, wherein the graphite in the step (1) is expanded graphite; the stripping agent is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate; the mass ratio of the graphite to the stripping agent is 2-8: 1, and the mass percentage of the graphite in a mixed liquid formed by the graphite, the stripping agent and water is 2-10%.
3. The heat conducting sheet according to claim 1, wherein in the step (2), the mass of the titanate coupling agent is 1-5% of that of the graphite; the maximum radial dimension of the modified graphene is 2-20 mu m.
4. A heat conducting sheet according to claim 1, wherein the sand milling mixing medium of the sand mill is an oxidized steel ball with a diameter of 0.8mm to 2.0mm, the mill mixing time is 0.5h to 1h, and the mill mixing temperature is 20 ℃ to 60 ℃.
5. A method for producing a thermally conductive sheet as claimed in claim 1, characterized in that the method comprises: mixing 20-30 parts of boron nitride particles, 20-30 parts of modified graphene and 50-80 parts of adhesive, and then extruding and rolling the mixture into a sheet on an extruder to obtain the heat-conducting sheet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010566019.8A CN111718694A (en) | 2020-06-19 | 2020-06-19 | Heat conducting fin and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462202A (en) * | 2021-06-24 | 2021-10-01 | 浙江工业大学 | Method for improving dispersion effect of graphene in acrylic emulsion |
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-
2020
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106103383A (en) * | 2014-01-06 | 2016-11-09 | 莫门蒂夫性能材料股份有限公司 | High length-diameter ratio boron nitride, method and the compositions containing described high length-diameter ratio boron nitride |
| CN106634863A (en) * | 2016-12-30 | 2017-05-10 | 深圳市大族元亨光电股份有限公司 | Graphene based silica gel heat-conductive gasket and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113462202A (en) * | 2021-06-24 | 2021-10-01 | 浙江工业大学 | Method for improving dispersion effect of graphene in acrylic emulsion |
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