CN111423725A - Heat transfer and storage multifunctional sheet, preparation method thereof and heat dissipation structure - Google Patents

Heat transfer and storage multifunctional sheet, preparation method thereof and heat dissipation structure Download PDF

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Publication number
CN111423725A
CN111423725A CN202010272966.6A CN202010272966A CN111423725A CN 111423725 A CN111423725 A CN 111423725A CN 202010272966 A CN202010272966 A CN 202010272966A CN 111423725 A CN111423725 A CN 111423725A
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heat
heat transfer
multifunctional
silica gel
change material
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杜鸿达
陈威
龙晴明
于孟雪
康飞宇
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Shenzhen International Graduate School of Tsinghua University
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Shenzhen International Graduate School of Tsinghua University
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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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
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
    • C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/367—Cooling facilitated by shape of device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
    • H01L23/3738—Semiconductor materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
    • H01L23/427—Cooling by change of state, e.g. use of heat pipes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6552—Closed pipes transferring heat by thermal conductivity or phase transition, e.g. heat pipes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
    • C—CHEMISTRY; METALLURGY
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    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
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    • C08K7/06—Elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • 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

Abstract

The invention discloses a heat transfer and storage multifunctional sheet, which comprises: a silica gel substrate; the heat-conducting filler is dispersed in the silica gel matrix and comprises fibers or a mixture of the fibers and powder particles, and the fibers are directionally arranged along the thickness direction of the silica gel matrix; and the phase-change material is dispersed in the silica gel matrix. The heat transfer and storage multifunctional sheet provided by the invention has the characteristics of high heat conductivity coefficient, short heat storage and storage time and high heat exchange efficiency. The invention also discloses a preparation method of the heat transfer and storage multifunctional sheet and a heat dissipation structure.

Description

Heat transfer and storage multifunctional sheet, preparation method thereof and heat dissipation structure
Technical Field
The invention relates to the technical field of heat-conducting phase-change materials, in particular to a heat-transferring and heat-storing multifunctional sheet, a preparation method thereof and a heat-radiating structure.
Background
The heat-conducting silica gel has high bonding performance and good heat-conducting effect, is widely applied to filling gaps between contact surfaces of heating elements (such as CPU and GPU) and a radiator, can ensure that different contact surfaces are in full contact better, and can achieve the temperature difference as small as possible in reaction on temperature.
However, the heat conductive silica gel is filled with heat conductive filler in the silica gel matrix to improve the heat conductive performance. The commonly used heat-conducting filler is mainly inorganic powder, and the inorganic powder needs high filling amount to achieve higher heat conductivity, and the high filling amount can seriously influence the mechanical property of the silica gel.
The phase-change material absorbs or emits a large amount of phase-change latent heat when the state changes, so that heat storage is realized. In the phase change process, the phase change temperature is constant, and the aim of controlling the temperature can be fulfilled. Therefore, the phase-change material can absorb the heat emitted by the electronic device during operation, and the temperature of the electronic device is maintained near the phase-change temperature of the phase-change material, so that the temperature is controlled in the optimal temperature range for the operation of the electronic device, thereby ensuring the stability of the operation of the electronic device and prolonging the service life of the electronic device. However, most phase-change materials have the problem of too low heat conductivity coefficient, so that the heat transfer performance of the heat storage system is poor, the heat storage and heat storage time is long, and the heat efficiency of the system is further reduced.
Disclosure of Invention
In view of the above, the present invention provides a heat transfer and storage multifunctional sheet, which has the characteristics of high heat conductivity, short heat storage and storage time, and high heat exchange efficiency.
In addition, a preparation method of the heat transfer and storage multifunctional sheet is also needed.
In addition, it is necessary to provide a heat dissipation structure including the heat transfer and storage multifunctional sheet.
The invention provides a heat transfer and storage multifunctional sheet, comprising:
a silica gel substrate;
the heat-conducting filler is dispersed in the silica gel matrix and comprises fibers or a mixture of the fibers and powder particles, and the fibers are directionally arranged along the thickness direction of the silica gel matrix; and
and the phase-change material is dispersed in the silica gel matrix.
The invention also provides a preparation method of the heat transfer and storage multifunctional sheet, which comprises the following steps:
mixing the heat-conducting filler, the micro/nano capsule phase change material and the bi-component silica gel to obtain a mixture;
transferring the mixture into a dispensing tube, and vacuumizing the dispensing tube;
connecting the dispensing pipe with a printer for printing; and
and curing and die cutting to obtain the heat transfer and storage multifunctional sheet.
The invention also provides a heat dissipation structure, which comprises the heat transfer and heat storage multifunctional sheet, a heating source and a heat dissipation part, wherein the heat transfer and heat storage multifunctional sheet is positioned between the heating source and the heat dissipation part.
According to the invention, the high-thermal-conductivity filler is added into the silica gel matrix and is directionally arranged, so that the thermal conductivity of the heat transfer and storage multifunctional sheet is remarkably improved. And moreover, the phase-change material is added into the silica gel substrate, so that the latent heat of the heat transfer and heat storage multifunctional sheet is improved. Wherein the phase change material uses micro/nano capsule phase change material, thereby effectively preventing the leakage of the phase change material and increasing the stability of the phase change material.
Drawings
Fig. 1 is a schematic structural view of a heat transfer and storage multifunctional sheet according to a preferred embodiment of the invention.
Fig. 2 is a schematic view of the orientation of the fibers shown in fig. 1.
Fig. 3 is a flow chart of a process for preparing a heat transfer and storage multifunctional sheet according to a preferred embodiment of the invention.
Fig. 4 is a schematic structural diagram of a heat dissipation structure according to a preferred embodiment of the invention.
Description of the main elements
Heat transfer and storage multifunctional sheet 100
Silica gel base 10
Thermally conductive filler 20
Fiber 201
Powder particles 202
Phase change material 30
Heat dissipation structure 200
Heat generating source 210
Heat dissipation member 220
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 and 2, a heat transfer and storage multifunctional sheet 100 according to a preferred embodiment of the present invention may be applied to the fields of electronic devices, battery materials, electric vehicles, building energy saving, solar energy utilization, industrial waste heat recovery, electric power peak clipping and valley filling, aerospace, and the like. The heat transfer and storage multifunctional sheet 100 includes a silica gel base 10, and a heat conductive filler 20 and a phase change material 30 dispersed in the silica gel base 10.
In the present embodiment, the silica gel matrix 10 is a two-component silica gel. The ratio of the two components can be adjusted according to the hardness of the silica gel matrix 10. The volume ratio of the silica gel matrix 10 in the heat transfer and storage multifunctional sheet 100 is 20-80%.
In the present embodiment, the thermally conductive filler 20 includes a fiber 201 or a mixture of the fiber 201 and powder particles 202. Referring to fig. 2, the fibers 201 are aligned in the silica gel matrix 10 along the thickness direction of the silica gel matrix 10. Specifically, the axial direction of the fibers 201 is substantially parallel to the thickness of the silicone matrix 10. The volume ratio of the fiber 201 in the heat transfer and storage multifunctional sheet 100 is 10-40%.
The fibers 201 include at least one of pitch-based carbon fibers, graphene fibers, carbon nanotube fibers, and graphite fibers. Preferably, the fibers 201 are pitch-based carbon fibers. Compared with other fibers, the pitch-based carbon fiber has great advantages in production and preparation, heat conductivity and the like. Wherein the diameter of the pitch-based carbon fiber is 5-15 μm, and the length of the pitch-based carbon fiber is 50-500 μm. Preferably, the pitch-based carbon fiber has a diameter of 10 μm and a length of 150 μm or 250 μm.
In the present embodiment, the powder particles 202 are randomly distributed in the silica gel matrix 10. Wherein, the volume ratio of the powder particles 202 in the heat transfer and heat storage multifunctional sheet 100 is 0-50%. If the volume ratio of the powder particles 202 in the multifunctional heat and heat transfer sheet 100 is too high, the orientation of the fibers 201 will be affected, and the hardness of the multifunctional heat and heat transfer sheet 100 will also be increased.
The powder particles 202 include at least one of alumina powder, zinc oxide powder, magnesium oxide powder, aluminum nitride powder, boron nitride powder, silicon carbide powder, silicon nitride powder, diamond powder, graphite, expanded graphite, carbon nanotubes, graphene, and metal powder. Wherein the particle size of the powder particles 202 is 50nm-100 μm. Preferably, the particle size of the powder particle 202 is 500nm-10 μm.
In the present embodiment, the powder particles 202 are alumina powder, and the alumina powder may be surface-modified. The surface-modified alumina powder can improve the dispersibility of the alumina powder in the silica gel matrix 10 and improve the flexibility of the heat transfer and storage multifunctional sheet 100. Wherein the surface modification of the alumina powder can be realized by the following method:
mixing deionized water and ethanol in proportion to serve as a solvent, adding a coupling agent into the solvent, heating and stirring in a 80 ℃ constant-temperature water bath for 0.5h, adding the alumina powder, heating and stirring in the 80 ℃ constant-temperature water bath for 3h, and sequentially filtering, cleaning and drying to obtain the surface-modified alumina powder. Wherein the coupling agent may be a silane coupling agent.
Wherein the particle size of the alumina powder is 30nm-70 μm. Preferably, the alumina powder has a particle size of 500nm to 10 μm. Meanwhile, grading with different particle sizes can be carried out, so that the alumina with different particle sizes can be effectively contacted, and the thermal conductivity is improved. In the present embodiment, the coupling agent is a silane coupling agent. Preferably, the coupling agent is hexadecyltrimethoxysilane (9116). Wherein the dosage of the coupling agent is 6 per mill-2% of the mass of the filler.
The phase change material 30 is at least one of a solid-solid phase change material and a solid-liquid phase change material. In the present embodiment, the phase change material 30 is a solid-liquid phase change material. In particular, the solid-liquid phase change material is a micro/nanocapsule phase change material. Wherein the particle size of the micro/nano capsule phase change material is 10nm-100 mu m. Preferably, the micro/nano capsule phase change material has a particle size of 500nm to 50 μm. The volume ratio of the micro/nano capsule phase change material in the heat transfer and heat storage multifunctional sheet 100 is 10-40%. If the volume ratio of the micro/nano capsule phase change material in the heat transfer and heat storage multifunctional sheet 100 is lower than 10%, the energy storage value of the heat transfer and heat storage multifunctional sheet 100 is reduced; if the volume ratio of the micro/nano capsule phase change material in the heat transfer and heat storage multifunctional sheet 100 is higher than 40%, the micro/nano capsule phase change material is not favorably dispersed in the silica gel matrix 10.
In this embodiment, the micro/nano capsule phase change material is a core-shell structure, and the core-shell structure includes a core material and a wall material surrounding the core material. The core material is a phase-change material, and the wall material is a polymer or an inorganic material. Preferably, the wall material is an inorganic material. Wherein, the polymer can be polyethylene, and the inorganic material can be alumina, silicon dioxide and the like.
Wherein, the thickness of the heat transfer and storage multifunctional sheet 100 can be 0.3-5 mm.
Referring to fig. 3, a method for manufacturing a heat transfer and storage multifunctional sheet 100 according to a preferred embodiment of the present invention includes the following steps:
s11, mixing the heat-conducting filler 20, the micro/nano capsule phase change material and the bi-component silica gel to obtain a mixture.
Specifically, a certain mass of the heat-conducting filler 20 and the micro/nano capsule phase-change material are weighed and dry-mixed, the two-component silica gel is added after uniform mixing, the mixture is stirred and then stirred in vacuum for 2-3 hours to carry out defoaming treatment, and a material pressing machine is used for pressing materials to obtain the mixture.
S12, transferring the mixture into a dispensing tube, and vacuumizing the dispensing tube.
Wherein, the glue dispensing tube can be vacuumized in a vacuum oven.
And S13, connecting the dispensing pipe with a printer for printing.
Wherein, the printer is the 3D printer. In printing, the fibers in the mixture are oriented during extrusion to align them.
And S14, curing and die cutting to obtain the heat transfer and storage multifunctional sheet 100.
In the present embodiment, the curing molding may be performed in an oven. Wherein the curing temperature is 100-180 ℃. The curing time depends on the size of the product.
The solidified heat transfer and storage multifunctional block can be cut by an ultrasonic cutting knife to obtain the heat transfer and storage multifunctional sheet 100. Wherein the thickness of the cut is more than 0.3 mm. It is understood that the heat transfer and storage multifunctional sheet 100 with any thickness can be cut according to actual needs.
Referring to fig. 4, a heat dissipation structure 200 is further provided in the preferred embodiment of the present invention, the heat dissipation structure 200 includes a heat source 210, a heat dissipation member 220, and the heat transfer and storage multifunctional sheet 100 located between the heat source 210 and the heat dissipation member 220.
The heat generating source 210 includes at least one of a chip and a battery. Wherein, the battery can be a power battery. The heat dissipation member 220 includes at least one of a heat sink, a graphite film, a graphene film, a heat pipe, and a hot plate. Wherein the hot plate can be a VC hot plate (vacuum cavity vapor chamber).
The present invention will be specifically described below with reference to examples.
Example 1
Firstly, weighing 66g of carbon fiber with the length of 150 mu m, 156g of alumina powder with the particle size of 5 mu m and 73.8g of micro/nano capsule phase change material, and uniformly mixing to obtain an intermediate.
And secondly, weighing 70g of double-component silica gel, adding the double-component silica gel into the intermediate in the first step, wherein the mass ratio of the two silica gel components is 1:1, stirring, then carrying out vacuum stirring for 3 hours to carry out defoaming treatment, and pressing by using a pressing machine to obtain a mixture.
And thirdly, transferring the mixture in the second step to a glue dispensing pipe.
And fourthly, placing the dispensing tube into a vacuum oven, and vacuumizing for 1 h.
And fifthly, connecting the dispensing pipe with a 3D printer for printing, and setting a program of the printer. Wherein the discharging speed is set to be 45mm/s, the diameter of the spray head is 4mm, and the length is 80 mm.
And sixthly, curing the mixture, wherein the curing temperature is set to be 130 ℃, and the curing time is set to be 10 h.
And seventhly, die cutting, wherein the cutting thickness is 0.5 mm.
Example 2
Step one, preparing deionized water and ethanol into a mixed solution according to the mass ratio of 5:1, adding a coupling agent 9116 accounting for 1% of the mass of alumina, and stirring in a constant-temperature water bath at 80 ℃ for 0.5 h.
And secondly, adding alumina powder with a certain mass particle size of 3 mu m, stirring for 3 hours in a water bath with constant temperature of 80 ℃, coupling, and sequentially filtering, cleaning and drying for later use.
And step three, weighing 79.2g of carbon fiber with the length of 150 mu m, 78g of coupled alumina powder with the particle size of 3 mu m and 73.8g of micro/nano capsule phase change material, and uniformly mixing the three to obtain an intermediate.
And step four, weighing 84g of double-component silica gel, adding the two-component silica gel into the intermediate in the step three, wherein the mass ratio of the two silica gel components is 1:1, stirring, then carrying out vacuum stirring for 3 hours, carrying out defoaming treatment, and pressing by using a pressing machine to obtain a mixture.
The fifth to ninth steps are the same as the third to seventh steps in example 1, please refer to example 1.
Example 3
Firstly, weighing 88g of carbon fiber with the length of 150 mu m, 62.4g of alumina powder with the grain diameter of 5 mu m and 73.8g of micro/nano capsule phase change material, and uniformly mixing to obtain an intermediate.
And secondly, weighing 84g of double-component silica gel, adding the two-component silica gel into the intermediate in the first step, wherein the mass ratio of the two silica gel components is 1:1, stirring, then carrying out vacuum stirring for 3 hours to carry out defoaming treatment, and pressing by using a pressing machine to obtain a mixture.
The third to fifth steps are the same as those in example 1, please refer to example 1.
And sixthly, curing the mixture, wherein the curing temperature is set to be 100 ℃, and the curing time is set to be 10 hours.
The seventh step is the same as the seventh step in example 1, please refer to example 1.
Example 4
Firstly, weighing 82.5g of carbon fiber with the length of 250 mu m, 80g of aluminum nitride powder with the particle size of 1 mu m and 107.6g of micro/nano capsule phase change material, and uniformly mixing to obtain an intermediate.
And secondly, weighing 100g of double-component silica gel, adding the double-component silica gel into the intermediate in the first step, wherein the mass ratio of the two silica gel components is 1:2, stirring, then carrying out vacuum stirring for 3 hours to carry out defoaming treatment, and pressing by using a pressing machine to obtain a mixture.
The third to fifth steps are the same as those in example 1, please refer to example 1.
And sixthly, curing the mixture, wherein the curing temperature is set to be 100 ℃, and the curing time is set to be 10 hours.
The seventh step is the same as the seventh step in example 1, please refer to example 1.
Example 5
First, 99g of carbon fiber with the length of 150 mu m, 56.2g of flaky boron nitride powder with the grain diameter of 3-5 mu m and 92.2g of micro/nano capsule phase change material are weighed and uniformly mixed to obtain an intermediate.
And secondly, weighing 105g of double-component silica gel, adding the double-component silica gel into the intermediate in the first step, wherein the mass ratio of the two silica gel components is 1:1, stirring, then stirring in vacuum for 3 hours for defoaming treatment, and pressing by using a pressing machine to obtain a mixture.
The third to seventh steps are the same as those in example 1, please refer to example 1.
Example 6
Firstly, weighing 118.8g of carbon fiber with the length of 150 mu m, 67.5g of 1000-mesh graphite powder and 118g of micro/nano capsule phase change material, and uniformly mixing to obtain an intermediate.
And secondly, weighing 120g of double-component silica gel, adding the double-component silica gel into the intermediate in the first step, wherein the mass ratio of the two silica gel components is 1:1, stirring, then carrying out vacuum stirring for 3 hours to carry out defoaming treatment, and pressing by using a pressing machine to obtain a mixture.
The third to seventh steps are the same as those in example 1, please refer to example 1.
Example 7
Firstly, weighing 74.8g of carbon fiber with the length of 250 mu m, 70g of diamond powder with the grain diameter of 5 mu m and 98.4g of micro/nano capsule phase change material, and uniformly mixing to obtain an intermediate.
And secondly, weighing 66g of double-component silica gel, adding the double-component silica gel into the mixture obtained in the first step, wherein the mass ratio of the two silica gel components is 1:1, stirring, then carrying out vacuum stirring for 3 hours to carry out defoaming treatment, and pressing by using a pressing machine to obtain a mixture.
The third to seventh steps are the same as those in example 1, please refer to example 1.
To the heat transfer and heat storage multifunctional sheet 100 prepared in examples 1 to 7, 1kgf/cm was applied2The load of (2) was thermally tested according to ASTM-D5470, and the test results are shown in Table 1.
TABLE 1 specific preparation conditions and thermal test results of examples 1 to 7 of the present invention
Figure BDA0002443770750000091
Therefore, the heat transfer and storage multifunctional sheet 100 prepared in the embodiments 1 to 7 of the invention has a thermal conductivity as high as 5 to 20 w/(m.k) and a storage energy value as high as 30 to 60 KJ/Kg. That is, the heat transfer and storage multifunctional sheet 100 of examples 1 to 7 has a high thermal conductivity while ensuring a high storage energy value. Moreover, in the multifunctional heat transfer and storage sheet 100 of examples 1 to 7, the volume ratio of the powder particles 202 in the multifunctional heat transfer and storage sheet 100 is calculated to be less than 40%, and is generally more than 80% compared with the volume ratio of the inorganic powder filling amount in the heat conductive sheet prepared in the prior art, so that the flexibility of the sheet is easily lost, and the multifunctional heat transfer and storage sheet 100 prepared in examples 1 to 7 has both heat conductivity and flexibility.
According to the invention, the fibers 201 are added into the silica gel matrix 10 and are directionally arranged, so that the thermal conductivity of the material is further improved, the heat storage efficiency and speed of the phase change material 30 are enhanced along with the improvement of the thermal conductivity coefficient, and the temperature rise speed at the interface is effectively delayed. Meanwhile, the phase change material 30 is a micro/nano capsule phase change material, so that leakage of the phase change material 30 is effectively prevented, and the stability of the phase change material 30 is improved. Due to the use of the silica gel substrate 10, the heat transfer and storage multifunctional sheet 100 has good flexibility, and interface attachment can be well realized in a heat dissipation structure. Moreover, the heat transfer and storage multifunctional sheet 100 is prepared by a 3D printing technology, and the preparation process is simple and feasible.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

Claims (11)

1. A heat transfer and storage multifunctional sheet is characterized by comprising:
a silica gel substrate;
the heat-conducting filler is dispersed in the silica gel matrix and comprises fibers or a mixture of the fibers and powder particles, and the fibers are directionally arranged along the thickness direction of the silica gel matrix; and
and the phase-change material is dispersed in the silica gel matrix.
2. The multifunctional heat transfer and heat storage sheet of claim 1, wherein the fibers comprise at least one of pitch-based carbon fibers, graphene fibers, carbon nanotube fibers, and graphite fibers.
3. The multifunctional heat transfer and heat storage sheet according to claim 2, wherein when the fibers are pitch-based carbon fibers, the pitch-based carbon fibers have a diameter of 5 to 15 μm and a length of 50 to 500 μm.
4. The multifunctional heat transfer and heat storage sheet according to claim 1, wherein the fiber in the heat conductive filler is present in an amount of 10 to 40% by volume in the multifunctional heat transfer and heat storage sheet.
5. The multifunctional heat transfer and heat storage sheet of claim 1, wherein the powder particles comprise at least one of alumina powder, zinc oxide powder, magnesium oxide powder, aluminum nitride powder, boron nitride powder, silicon carbide powder, silicon nitride powder, diamond powder, graphite, expanded graphite, carbon nanotubes, graphene, and metal powder.
6. The multifunctional heat transfer and heat storage sheet of claim 1, wherein the volume ratio of the powder particles in the multifunctional heat transfer and heat storage sheet is 0-50%.
7. The multifunctional heat transfer and heat storage sheet as claimed in claim 1, wherein the particle size of the powder particles is 50nm to 100 μm, and the powder particles are subjected to surface modification treatment.
8. The multifunctional heat transfer and heat storage sheet of claim 1, wherein the phase change material is at least one of a solid-solid phase change material and a solid-liquid phase change material, the phase change material comprises a micro/nano capsule phase change material, the particle size of the micro/nano capsule phase change material is 10nm-100 μm, and the volume ratio of the micro/nano capsule phase change material in the multifunctional heat transfer and heat storage sheet is 10% -40%.
9. The multifunctional heat transfer and heat storage sheet as claimed in claim 1, wherein the silica gel matrix is a bi-component silica gel, and the volume ratio of the silica gel matrix in the multifunctional heat transfer and heat storage sheet is 20-80%.
10. The preparation method of the heat transfer and storage multifunctional sheet is characterized by comprising the following steps of:
mixing the heat-conducting filler, the micro/nano capsule phase change material and the bi-component silica gel to obtain a mixture;
transferring the mixture into a dispensing tube, and vacuumizing the dispensing tube;
connecting the dispensing pipe with a printer for printing; and
and curing and die cutting to obtain the heat transfer and storage multifunctional sheet.
11. A heat dissipation structure, characterized in that the heat dissipation structure comprises the heat transfer and storage multifunctional sheet as claimed in any one of claims 1 to 9, the heat dissipation structure further comprises a heat source and a heat dissipation component, and the heat transfer and storage multifunctional sheet is located between the heat source and the heat dissipation component.
CN202010272966.6A 2020-04-09 2020-04-09 Heat transfer and storage multifunctional sheet, preparation method thereof and heat dissipation structure Pending CN111423725A (en)

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Publication number Priority date Publication date Assignee Title
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CN102971365A (en) * 2010-06-17 2013-03-13 迪睿合电子材料有限公司 Thermally conductive sheet and process for producing same
WO2015132006A2 (en) * 2014-03-07 2015-09-11 Ernst-Moritz-Arndt-Universität Greifswald Method for coating a substrate, use of the substrate, and device for coating
CN105348797A (en) * 2015-10-21 2016-02-24 中国科学院宁波材料技术与工程研究所 Graphene-based heat conduction silica gel phase change composite material and preparation method thereof

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CN102971365A (en) * 2010-06-17 2013-03-13 迪睿合电子材料有限公司 Thermally conductive sheet and process for producing same
WO2015132006A2 (en) * 2014-03-07 2015-09-11 Ernst-Moritz-Arndt-Universität Greifswald Method for coating a substrate, use of the substrate, and device for coating
CN105348797A (en) * 2015-10-21 2016-02-24 中国科学院宁波材料技术与工程研究所 Graphene-based heat conduction silica gel phase change composite material and preparation method thereof

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Application publication date: 20200717