CN112054001A - Carbon-based composite heat conducting sheet, heat conductor and preparation method thereof - Google Patents

Carbon-based composite heat conducting sheet, heat conductor and preparation method thereof Download PDF

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Publication number
CN112054001A
CN112054001A CN202010842135.8A CN202010842135A CN112054001A CN 112054001 A CN112054001 A CN 112054001A CN 202010842135 A CN202010842135 A CN 202010842135A CN 112054001 A CN112054001 A CN 112054001A
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carbon
based composite
composite heat
heat
based fiber
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陈方
刘晶云
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Johan Shenzhen Co ltd
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Johan Shenzhen Co ltd
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    • 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
    • H01L23/3735—Laminates or multilayers, e.g. direct bond copper ceramic substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4871—Bases, plates or heatsinks
    • 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
    • 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
    • H05K7/20509—Multiple-component heat spreaders; Multi-component heat-conducting support plates; Multi-component non-closed heat-conducting structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

The invention relates to a carbon-based composite heat conducting fin, which comprises: the carbon-based fiber composite material comprises a support substrate, a plurality of carbon-based fiber sheets and a heat conduction polymerization layer; the carbon-based fiber sheets are arranged in an oriented manner and are bonded on the supporting substrate, and intervals are arranged between every two adjacent carbon-based fiber sheets; the heat-conducting polymer layer is arranged on the carbon-based fiber sheets and fills gaps between the adjacent carbon-based fiber sheets. The carbon-based fiber sheets in the carbon-based composite heat conducting sheet are arranged in an oriented mode, the heat conducting performance of the graphite layer of the carbon-based fiber sheets in an X-Y axial plane is fully exerted, a high heat conducting channel in the end face direction is formed, and the thermal resistance of the end face is reduced. The invention adopts the technical means of directionally arranging the carbon-based fiber sheets, overcomes the technical problem of low heat conductivity coefficient of the heat-conducting product, and achieves the technical effect of improving the heat conductivity coefficient of the heat-conducting product.

Description

Carbon-based composite heat conducting sheet, heat conductor and preparation method thereof
Technical Field
The invention relates to the field of composite heat conductors, in particular to a carbon-based composite heat conducting sheet, a heat conductor and a preparation method thereof.
Background
With the continuous improvement of electronic technology and the improvement of integration level, the power consumption of various elements is rapidly increased, and the problem of product failure caused by out-of-control thermal management is increasingly prominent. A large amount of heat generated in the electronic device cannot be effectively conducted out, and the local temperature in the element is too high, so that the operation among the elements is influenced. The existence of the heat-conducting interface material as an indispensable component in electronic products affects the operation performance, reliability and service life of the whole electronic device.
At present, the commonly used heat-conducting interface materials are mainly classified into metals such as silica gel, copper and the like and graphite. The heat conducting silica gel has poor heat conductivity and needs to be filled with heat conducting fillers, however, the more the fillers are, the lower the compression ratio is, the heat source cannot be in close contact with the radiator, the thermal resistance is large, the heat dissipation efficiency is low, and the design tolerance existing in products or application cannot be solved; copper-aluminum metals have good thermal conductivity and fast heat dissipation, but cannot be compressed to form an interfacial gap, have large thermal resistance and cannot meet the requirement of lightening and thinning electronic products; graphite is a relatively novel heat conduction and heat dissipation material at present, although the heat conductivity coefficient in an X-Y axial plane is 3 times that of copper, the heat conductivity in a Z axial direction is poor, and the graphite cannot be compressed, so that the heat conductivity coefficient in the longitudinal/thickness direction of an actual graphite heat conduction interface product in the market is not high, and the graphite heat conduction and heat dissipation material is not an ideal heat conduction interface material.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a carbon-based composite heat conducting sheet, a heat conductor and a preparation method thereof, so as to solve the technical problem that the heat conductivity coefficient of a heat conducting product is not high.
In order to solve the above technical problem, an embodiment of the present invention provides a carbon-based composite heat conductive sheet, including: the carbon-based fiber composite material comprises a support substrate, a plurality of carbon-based fiber sheets and a heat conduction polymerization layer; the carbon-based fiber sheets are arranged in an oriented manner and are bonded on the supporting substrate, and intervals are arranged between every two adjacent carbon-based fiber sheets; the heat-conducting polymer layer is arranged on the carbon-based fiber sheets and fills gaps between the adjacent carbon-based fiber sheets.
Further, a first bonding layer is arranged between the carbon-based fiber sheet and the support base.
Further, the first bonding layer is one or a combination of a plurality of acrylic bonding agents, polyurethane bonding agents, polyethylene bonding agents, acrylonitrile bonding agents and polyvinyl alcohol bonding agents.
Further, the base material of the carbon-based fiber sheet is prepared by cutting after being processed by coating and pressing rollers on the basis of one or more of micron/nanometer-level natural or artificial graphite sheets, micron/nanometer porous carbon, multilayer/single-layer graphene, single-arm/multi-arm carbon nanotubes and carbon-based materials of nanofibers.
Furthermore, the size range of the cross section of the carbon-based fiber sheet is 10 um-1 cm, and the whole length of the carbon-based fiber sheet is 0.01 m-10 m.
Further, the carbon-based fiber sheets are arranged in parallel with the substrate or in perpendicular to the substrate, and are obliquely and crosswise arranged with the substrate.
Furthermore, the supporting substrate is a substrate manufactured on the basis of one or more of polyimide, polyetherimide and ultrathin copper foil, and the thickness of the supporting substrate ranges from 0.01mm to 1 mm.
Further, the heat-conducting polymer layer is made of one or a combination of a plurality of acrylic adhesives, silicone gel with heat-conducting property, polyurethane adhesives and polyethylene adhesives.
Correspondingly, the invention also provides a carbon-based composite heat conductor, wherein the carbon-based composite heat conductor is provided with a plurality of layers of the carbon-based composite heat conducting fins; and the adjacent carbon-based composite heat conducting fins are bonded through a second bonding layer or hot melt adhesive.
Further, the second bonding layer is one or a combination of a plurality of acrylic bonding agents, polyurethane bonding agents, polyethylene bonding agents, acrylonitrile bonding agents and polyvinyl alcohol bonding agents.
Further, the hot melt adhesive can be one or a combination of more of EVA hot melt adhesive, TPU hot melt adhesive, PES hot melt adhesive, PA hot melt adhesive and PO hot melt adhesive.
Accordingly, the present invention also provides a method for producing a carbon-based composite thermally conductive sheet, which is used for producing the carbon-based composite thermally conductive sheet, and includes: manufacturing a carbon-based fiber sheet; coating a first bonding layer to one side of a support substrate; attaching the carbon-based fiber sheet to a support substrate at intervals so that the carbon-based fiber sheet is aligned and bonded to the support substrate through a first bonding layer; and coating a heat-conducting polymer on the support substrate and the carbon-based fiber sheet, and curing after heating.
Further, the thermally conductive polymer adds a blowing agent.
A method of producing a carbon-based composite heat conductor, the method of producing a carbon-based composite heat conductor being used for producing the carbon-based composite heat conductor; the method for preparing the carbon-based composite heat conductor comprises the following steps: preparing a carbon-based composite heat conducting sheet, namely a compounding step; wherein the step of preparing the carbon-based composite heat conducting sheet comprises the following steps: manufacturing a carbon-based fiber sheet; coating a first bonding layer to one side of a support substrate; attaching the carbon-based fiber sheet to a support substrate at intervals so that the carbon-based fiber sheet is aligned and bonded to the support substrate through a first bonding layer; coating a heat-conducting polymer on the support substrate and the carbon-based fiber sheet, heating and curing; wherein the compounding step comprises: coating an adhesive or a hot melt adhesive on one side of the support substrate of the carbon-based composite heat conducting sheet, which is far away from the carbon-based fiber sheet; sequentially stacking a plurality of the carbon-based composite heat-conducting fins; and heating the superposed carbon-based composite heat-conducting sheets so as to bond the adjacent carbon-based composite heat-conducting sheets.
According to the embodiment of the invention, the carbon-based composite heat conducting sheet is provided, and the carbon-based fiber sheets in the carbon-based composite heat conducting sheet are arranged in an oriented manner, so that the heat conducting performance of the graphite layer of the carbon-based fiber sheets in an X-Y axial plane is fully exerted, a high heat conducting channel in the end face direction is formed, and the thermal resistance of the end face is reduced. The invention adopts the technical means of directionally arranging the carbon-based fiber sheets, overcomes the technical problem of low heat conductivity coefficient of the heat-conducting product, and achieves the technical effect of improving the heat conductivity coefficient of the heat-conducting product.
Furthermore, the heat-conducting polymer used for manufacturing the heat-conducting polymerization layer can be foamed by adding a foaming agent according to the process, and after the heat-conducting polymerization layer is formed, the compression rate can reach 40 percent, so that the interface contact between a heat source and a heat conductor is good.
The carbon-based composite heat conductor is also provided, the carbon-based composite heat conductor is formed by bonding and superposing the carbon-based composite heat conductors, the arrangement directions of carbon-based fiber sheets of the carbon-based composite heat conductor are consistent, the heat conduction performance of a graphite layer of the carbon-based fiber sheets in an X-Y axial plane is fully exerted, and a high heat conduction channel in the superposed end face direction is formed.
The invention also provides a method for preparing the carbon-based composite heat conducting fin, which enables the arrangement directions of the carbon-based fiber sheets to be consistent in a directional arrangement and bonding mode, thereby exerting the advantage of good heat conducting performance of the graphite layer in an X-Y axial plane, and enabling the prepared carbon-based composite heat conducting fin to be good in heat conducting performance and low in heat resistance.
The invention also provides a method for preparing the carbon-based composite heat conductor, which is characterized in that the carbon-based fiber sheets with consistent arrangement direction are manufactured and then are compounded and overlapped to form the carbon-based composite heat conductor, so that the heat conducting performance of the carbon-based fiber sheets in the carbon-based composite heat conductor is best exerted, the carbon-based composite heat conductor has compressibility and the processing difficulty is reduced.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a cross-sectional view of a carbon-based composite thermally conductive sheet according to the present invention;
FIG. 2 is a schematic view of a carbon-based composite thermally conductive sheet according to the present invention;
FIG. 3 is a flowchart illustrating a method for manufacturing a carbon-based composite heat conductive sheet according to the present invention;
fig. 4 is a flowchart of a method for producing a carbon-based composite heat conductor according to the present invention.
Description of the reference numerals
100 heat conductor 10 heat conducting fin
1 support substrate 2 carbon-based fiber sheet
3 thermally conductive polymeric layer 4 first adhesive layer
5 second adhesive layer
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further described and illustrated below with reference to the schematic drawings, but not limited thereto.
If directional indications (such as up, down, left, right, front, and rear … …) are provided in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the movement, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
As shown in fig. 1, a carbon-based composite heat conductive sheet 10 includes: the carbon-based fiber piece 2, the heat conduction polymerization layer 3.
Preferably, a plurality of carbon-based fiber sheets 2 are arranged in an oriented manner and bonded to the support substrate 1, and a space is provided between adjacent carbon-based fiber sheets 2.
Preferably, the thermally conductive polymer layer 3 is disposed on the carbon-based fiber sheets 2 and fills gaps between the adjacent carbon-based fiber sheets 2.
Preferably, a first adhesive layer 4 is provided between the carbon-based fiber sheet 2 and the support base.
Preferably, the first adhesive layer 4 is one or a combination of a plurality of types of acrylic adhesives, polyurethane adhesives, polyethylene adhesives, acrylonitrile adhesives, and polyvinyl alcohol adhesives.
Preferably, the base material of the carbon-based fiber sheet 2 is prepared by cutting after being processed by coating and pressing rollers on the basis of one or more of micron/nanometer-level natural or artificial graphite sheets, micron/nanometer porous carbon, multilayer/single-layer graphene, single-arm/multi-arm carbon nanotubes and nanofiber carbon-based materials. The carbon-based fiber sheet 2 is cut into a fiber shape after being manufactured by a compression roller, the size range of the cross section of the carbon-based fiber sheet 2 is 10 um-1 cm, the whole length is 0.01 m-10 m, and the heat conductivity coefficient is more than or equal to 300W/(m.k).
Preferably, the carbon-based fiber sheet 2 is arranged parallel to the substrate or perpendicular to the substrate, and obliquely crosses the substrate.
Preferably, the supporting substrate 1 is a substrate made of one or more of polyimide, polyetherimide and ultra-thin copper foil, and the thickness of the supporting substrate 1 is 0.01 to 1 mm.
Preferably, the thermally conductive polymer layer 3 is made of one or a combination of acrylic adhesive, silicone gel with thermal conductivity, polyurethane adhesive, and polyethylene adhesive. Foaming agent can be added for foaming according to the process, and the compression rate can reach 40% after the selected polymer is formed.
The carbon-based fiber sheets 1 in the carbon-based composite heat conducting sheet 10 are arranged in an oriented mode, so that the heat conducting performance of the graphite layer of the carbon-based fiber sheets in an X-Y axial plane is fully exerted, a high heat conducting channel in the end face direction is formed, and the thermal resistance of the end face is reduced. The invention adopts the technical means of directionally arranging the carbon-based fiber sheets, overcomes the technical problem of low heat conductivity coefficient of the heat-conducting product, and achieves the technical effect of improving the heat conductivity coefficient of the heat-conducting product.
As shown in fig. 2, in a carbon-based composite heat conductor 100, a plurality of layers of the carbon-based composite heat conducting fins 10 are provided in the carbon-based composite heat conductor 100, and adjacent carbon-based composite heat conducting fins 10 are bonded to each other by a second adhesive layer 5.
Preferably, the second adhesive layer 5 is one or a combination of a plurality of types of acrylic adhesives, polyurethane adhesives, polyethylene adhesives, acrylonitrile adhesives, and polyvinyl alcohol adhesives.
In other embodiments, adjacent carbon-based composite heat conductive sheets 10 are bonded to each other by a hot melt adhesive. The hot melt adhesive can be one or a combination of EVA hot melt adhesive, TPU hot melt adhesive, PES hot melt adhesive, PA hot melt adhesive and PO hot melt adhesive.
The utility model provides a compound heat conductor 100 of carbon back class, adopt foretell compound heat conductor 100 of carbon back class 10 bonding stack formation carbon back class, the carbon back class compound heat conductor 100's of carbon back class 1 arrangement direction is unanimous, full play carbon back class fiber graphite layer in the heat conductivility of X-Y axial plane, constitute the high heat conduction passageway of stack terminal surface direction, owing to used first tie coat, the second tie coat, heat conducting polymer, its whole material compressibility reaches up to 20% behind stack terminal surface direction, can fully increase the area of contact with radiating element/heat source, reduce the thermal resistance, promote the radiating efficiency, and certain cushioning effect to electronic component has been played to high compressibility, reduce the damaged probability of component.
As shown in fig. 3, a method for manufacturing a carbon-based composite heat conductive sheet is used to manufacture the carbon-based composite heat conductive sheet. The method for preparing the carbon-based composite heat-conducting sheet comprises the following steps:
manufacturing a carbon-based fiber sheet;
coating a first bonding layer to one side of a support substrate;
attaching the carbon-based fiber sheet to a support substrate at intervals so that the carbon-based fiber sheet is directionally arranged through a first bonding layer and is bonded to the support substrate;
and coating a heat-conducting polymer on the support substrate and the carbon-based fiber sheet, and curing after heating. And heating and curing the heat-conducting polymer to form a heat-conducting polymerization layer.
Wherein, a foaming agent is added in the heat-conducting polymer according to the requirement. In other embodiments, the thermally conductive polymer may not be added with a blowing agent.
Specifically, a long-strip-shaped graphite sheet is cut in a cutting mode to prepare a micron-grade carbon-based fiber sheet; adhering a layer of adhesive on a support substrate, and adhering the fiber sheets on the support substrate in a mode of arranging at a certain distance; and coating a layer of foamed or unfoamed heat-conducting polymer on the support substrate, and heating and curing the heat-conducting polymer into the carbon-based composite heat-conducting sheet with a certain thickness.
As shown in fig. 4, a method of manufacturing a carbon-based composite heat conductor is used to manufacture the carbon-based composite heat conductor. The method for preparing the carbon-based composite heat conductor comprises the following steps: preparing a carbon-based composite heat conducting sheet and compounding.
The preparation method of the carbon-based composite heat conducting sheet comprises the following steps:
manufacturing a carbon-based fiber sheet;
coating a first bonding layer to one side of a support substrate;
attaching the carbon-based fiber sheet to the support substrate at intervals so that the carbon-based fiber sheet is directionally arranged through the first bonding layer and is bonded to the support substrate;
and coating a heat-conducting polymer on the support substrate and the carbon-based fiber sheet, and curing after heating. And heating and curing the heat-conducting polymer to form a heat-conducting polymerization layer.
The compounding steps comprise:
coating an adhesive or a hot melt adhesive on one side of the support substrate of the carbon-based composite heat conducting sheet, which is far away from the carbon-based fiber sheet;
sequentially stacking a plurality of the carbon-based composite heat-conducting fins;
and heating the superposed carbon-based composite heat-conducting sheets so as to bond the adjacent carbon-based composite heat-conducting sheets.
Specifically, a long-strip-shaped graphite sheet is cut in a cutting mode to prepare a micron-grade carbon-based fiber sheet; adhering a layer of adhesive on a support substrate, and adhering the fiber sheets on the support substrate in a mode of arranging at a certain distance; and coating a layer of foamed or unfoamed heat-conducting polymer on the support substrate, and heating and curing the heat-conducting polymer into the carbon-based composite heat-conducting sheet with a certain thickness. And then coating a layer of adhesive or hot melt adhesive on the back surface of the supporting substrate to manufacture a heat-conducting matrix with a certain length and thickness, cutting or winding the heat-conducting matrix in a certain size, then overlapping/winding, heating and curing the adhesive or the hot melt adhesive on the back surface of the supporting substrate at a certain temperature, closely attaching the overlapped heat-conducting matrix together, and then vertically cutting into a carbon-based composite heat conductor finished product with a certain thickness. The cutting method may be cutting using a cutter or laser cutting, etc.
Implement one
Graphite sheets having a thickness of 0.05mm were cut into fiber sheets having a length of 400mm and a width of 5 mm. An electrolyte copper foil with the thickness of 5um is pasted in a square die groove with the length of 1000mm to be used as a supporting substrate. A layer of acrylic adhesive is coated on the copper foil, and then the cut carbon-based fiber sheets are attached to the support plate at intervals of 0.1 mm. Preparing silica gel as a heat conducting polymer, adding all curing agents, uniformly stirring, and pouring into a mold groove. At the moment, the mass of the carbon-based fiber sheet accounts for 25% of the total mass of the designed matrix, then the mold groove is heated until the temperature is raised to 100 ℃, the temperature is kept for 1 hour, the silica gel is completely solidified, and the rolling silica gel surface is kept at a fixed thickness in the second process. And then turning over the die groove, coating a layer of 0.01mm hot melt adhesive on the back surface of the copper foil as a bonding colloid, and manufacturing to obtain the heat-conducting matrix, wherein the thickness of the heat-conducting matrix is 1 mm. And (3) transversely winding and folding the heat-conducting parent body into a rectangle with the size of 50mm x 1000mm, winding and stacking the rectangle into 20 layers in total, wherein the average thickness of the middle part is 20mm, heating the stacked heat-conducting parent body, and curing the hot melt adhesive of the middle layer to be tightly bonded. Then, the carbon-based composite heat-conducting body is cut vertically and axially into carbon-based composite heat-conducting bodies with the thickness of 10mm and the size of 20mm x 50 mm.
Example two
Graphite sheets with a thickness of 0.05mm were cut into carbon-based fiber sheets with a length of 400mm and a width of 5 mm. An electrolyte copper foil with the thickness of 5um is pasted in a square die groove with the length of 1000mm to be used as a supporting substrate. Coating a layer of acrylic acid adhesive on the copper foil, then pasting the cut fiber sheets on a supporting plate at a distance of 0.1mm, preparing silica gel as a heat-conducting polymer, adding all curing agents, stirring uniformly, and pouring into a mold groove. At the moment, the mass of the carbon-based fiber sheet accounts for 25% of the total mass of the designed matrix, then the mold groove is heated until the temperature is raised to 100 ℃, the temperature is kept for 1 hour, the silica gel is completely solidified, and the rolling silica gel surface is kept at a fixed thickness in the second process. And then turning over the die groove, coating a layer of 0.01mm hot melt adhesive on the back surface of the copper foil as a bonding colloid, and manufacturing to obtain the heat-conducting matrix, wherein the thickness of the heat-conducting matrix is 1 mm. And (3) transversely winding and folding the heat-conducting parent body into a rectangle with the size of 50mm x 1000mm, winding and stacking the rectangle into 20 layers in total, wherein the average thickness of the middle part is 20mm, heating the stacked heat-conducting parent body, and curing the hot melt adhesive of the middle layer to be tightly bonded. Then, the carbon-based composite heat-conducting body is cut vertically and axially into carbon-based composite heat-conducting bodies with the thickness of 10mm and the size of 20mm x 50 mm.
EXAMPLE III
Graphite sheets with a thickness of 0.07mm were cut into carbon-based fiber sheets with a length of 1000mm and a width of 5 mm. An electrolyte copper foil with the thickness of 5um is pasted in a square die groove with the length of 1000mm to be used as a supporting substrate. A layer of acrylic adhesive is coated on the copper foil, and then the cut carbon-based fiber sheets are attached to the support plate at intervals of 0.1 mm. Preparing polyurethane glue as a heat-conducting polymer, adding a foaming agent, a catalyst and a stabilizer for fully and uniformly dispersing, foaming the polyurethane glue by using a foaming process, and simultaneously compressing the surface of the polyurethane glue by using a roller to keep the thickness consistent, wherein the foaming density is 0.1g/cm 3. The mass of the fibrous sheet at this time was 35% of the total design matrix mass. And then turning over the die groove, coating a layer of 0.02mm hot melt adhesive on the back surface of the copper foil as a bonding colloid, and finishing the manufacturing of the heat-conducting matrix, wherein the thickness of the heat-conducting matrix is 2 mm. The thermally conductive precursor was cut into 50mm by 50mm square, and then 15 thermally conductive precursors were stacked together. And heating the superposed heat-conducting parent bodies, curing and bonding the hot melt adhesive in the middle layer after heating the hot melt adhesive to each heat-conducting parent body to manufacture the heat conductor, wherein the thickness of the heat conductor is 30 mm. And then vertically cutting the heat conductor into carbon-based composite heat conductors with the size of 30mm x 50mm and the thickness of 10 mm.
Example four
Graphite sheets with a thickness of 0.07mm were cut into carbon-based fiber sheets with a length of 1000mm and a width of 5 mm. In a square mold groove having a length of 1000mm, a polyimide film having a thickness of 15um was attached as a supporting substrate. A layer of polyurethane adhesive was coated on the polyimide film, and then the cut carbon-based fiber sheets were attached to the support plate at intervals of 0.1 mm. A prescribed amount of polyethylene gum was prepared, poured into a mold tank, and heated to 80 ℃ to form a thermally conductive polymer. The mass of the fibrous sheet at this time was 40% of the total design matrix mass. And then turning over the die groove, and coating a layer of 0.02mm polyurethane glue as a bonding colloid on the back surface of the polyimide film to manufacture the heat-conducting matrix, wherein the thickness of the heat-conducting matrix is 1.5 mm. The thermally conductive precursor was cut into 50mm by 50mm square, and then 20 thermally conductive precursors were stacked together. And heating and cooling the superposed heat-conducting parent bodies, and solidifying and bonding the polyurethane glue in the middle layer with each heat-conducting parent body to manufacture the heat conductor, wherein the thickness of the heat conductor is 30 mm. And then vertically cutting the heat conductor into carbon-based composite heat conductors with the size of 30mm x 50mm and the thickness of 10 mm.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (14)

1. A carbon-based composite heat conductive sheet, comprising: the carbon-based fiber composite material comprises a support substrate, a plurality of carbon-based fiber sheets and a heat conduction polymerization layer; the carbon-based fiber sheets are arranged in an oriented manner and are bonded on the supporting substrate, and intervals are arranged between every two adjacent carbon-based fiber sheets; the heat-conducting polymer layer is arranged on the carbon-based fiber sheets and fills gaps between the adjacent carbon-based fiber sheets.
2. The carbon-based composite heat conductive sheet according to claim 1, wherein a first adhesive layer is provided between the carbon-based fiber sheet and the support base.
3. The carbon-based composite heat conductive sheet according to claim 2, wherein the first adhesive layer is one or a combination of acrylic adhesive, polyurethane adhesive, polyethylene adhesive, acrylonitrile adhesive, and polyvinyl alcohol adhesive.
4. The carbon-based composite heat conductive sheet according to claim 1, wherein the substrate of the carbon-based fiber sheet is made by cutting a carbon-based material based on one or more of micron/nanometer-level natural or artificial graphite sheets, micron/nanometer porous carbon, multilayer/single-layer graphene, single-arm/multi-arm carbon nanotubes, and nanofiber carbon-based materials after being processed by coating and pressing rollers.
5. The carbon-based composite thermal conductive sheet according to claim 1, wherein the carbon-based fiber sheet has a cross-sectional size ranging from 10 μm to 1cm and an overall length ranging from 0.01m to 10 m.
6. The carbon-based composite heat conductive sheet according to claim 1, wherein the carbon-based fiber sheet is arranged parallel to the substrate or arranged perpendicular to the substrate, and obliquely crossed with the substrate.
7. The carbon-based composite heat conductive sheet according to claim 1, wherein the support substrate is a substrate made of one or more of polyimide, polyetherimide, and ultra-thin copper foil, and has a thickness of 0.01 to 1 mm.
8. The carbon-based composite heat conductive sheet according to claim 1, wherein the thermally conductive polymer layer is made of one or a combination of acrylic adhesives, silicone gels having thermal conductivity, polyurethane adhesives, and polyethylene adhesives.
9. A carbon-based composite heat conductor characterized in that the carbon-based composite heat conductor is provided with a plurality of layers of the carbon-based composite heat conductive sheet as defined in any one of claims 1 to 8; and the adjacent carbon-based composite heat conducting fins are bonded through a second bonding layer or hot melt adhesive.
10. The carbon-based composite heat conductive sheet according to claim 9, wherein the second adhesive layer is one or a combination of acrylic adhesives, polyurethane adhesives, polyethylene adhesives, acrylonitrile adhesives, and polyvinyl alcohol adhesives.
11. The carbon-based composite thermal conductive sheet according to claim 9, wherein the hot melt adhesive is one or more of EVA hot melt adhesive, TPU hot melt adhesive, PES hot melt adhesive, PA hot melt adhesive, and PO hot melt adhesive.
12. A method for producing a carbon-based composite thermally conductive sheet, characterized in that the method for producing a carbon-based composite thermally conductive sheet is used for producing the carbon-based composite thermally conductive sheet according to any one of claims 1 to 8, and comprises:
manufacturing a carbon-based fiber sheet;
coating a first bonding layer to one side of a support substrate;
attaching the carbon-based fiber sheet to a support substrate at intervals so that the carbon-based fiber sheet is aligned and bonded to the support substrate through a first bonding layer;
and coating a heat-conducting polymer on the support substrate and the carbon-based fiber sheet, and curing after heating.
13. The method of producing a carbon-based composite heat-conductive sheet according to claim 12, wherein the heat-conductive polymer is added with a foaming agent.
14. A method of producing a carbon-based composite heat conductor, characterized in that the method of producing a carbon-based composite heat conductor is used to produce the carbon-based composite heat conductor according to claim 9; the method for preparing the carbon-based composite heat conductor comprises the following steps: preparing a carbon-based composite heat conducting sheet, namely a compounding step;
wherein the step of preparing the carbon-based composite heat conducting sheet comprises the following steps:
manufacturing a carbon-based fiber sheet;
coating a first bonding layer to one side of a support substrate;
attaching the carbon-based fiber sheet to a support substrate at intervals so that the carbon-based fiber sheet is aligned and bonded to the support substrate through a first bonding layer;
coating a heat-conducting polymer on the support substrate and the carbon-based fiber sheet, heating and curing;
wherein the compounding step comprises:
coating an adhesive or a hot melt adhesive on one side of the support substrate of the carbon-based composite heat conducting sheet, which is far away from the carbon-based fiber sheet;
sequentially stacking a plurality of the carbon-based composite heat-conducting fins;
and heating the superposed carbon-based composite heat-conducting sheets so as to bond the adjacent carbon-based composite heat-conducting sheets.
CN202010842135.8A 2020-08-20 2020-08-20 Carbon-based composite heat conducting sheet, heat conductor and preparation method thereof Pending CN112054001A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140140008A1 (en) * 2011-09-26 2014-05-22 Fujitsu Limited Heat dissipation material and method of manufacturing thereof, and electronic device and method of manufacturing thereof
CN105001450A (en) * 2015-07-09 2015-10-28 天津大学 High-directional-thermal-conductivity carbon/polymer composite material and preparation method
CN105531837A (en) * 2013-09-25 2016-04-27 琳得科株式会社 Heat-conductive adhesive sheet, manufacturing method for same, and electronic device using same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140140008A1 (en) * 2011-09-26 2014-05-22 Fujitsu Limited Heat dissipation material and method of manufacturing thereof, and electronic device and method of manufacturing thereof
CN105531837A (en) * 2013-09-25 2016-04-27 琳得科株式会社 Heat-conductive adhesive sheet, manufacturing method for same, and electronic device using same
CN105001450A (en) * 2015-07-09 2015-10-28 天津大学 High-directional-thermal-conductivity carbon/polymer composite material and preparation method

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