CN101712217B - Production process of thermally-conductive graphite interface material - Google Patents
Production process of thermally-conductive graphite interface material Download PDFInfo
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- CN101712217B CN101712217B CN 200910027939 CN200910027939A CN101712217B CN 101712217 B CN101712217 B CN 101712217B CN 200910027939 CN200910027939 CN 200910027939 CN 200910027939 A CN200910027939 A CN 200910027939A CN 101712217 B CN101712217 B CN 101712217B
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Abstract
The invention relates to a thermally-conductive graphite interface material and a production process thereof. The thermally-conductive graphite interface material is characterized by attaching films to at least one surface of a flexible graphite sheet by adhesives, coating high temperature resistant pressure-sensitive adhesives on the films and attaching separation materials to the other surfaces of the pressure-sensitive adhesives respectively. The production process comprises the procedures of coating, heating and drying, film covering, hot pressing, pressure-sensitive adhesive coating, release material sticking and rolling, etc. The film materials attached to the thermally-conductive graphite interface material on the one hand have the effect of surface insulation and on the other hand can effectively prevent the surface of the heat-exchange graphite material from being scratched, thereby obtaining the thermally-conductive interface material which is stable in use and has good thermal conductivity. The material of the invention is convenient to use. When the material is used, the release paper on the two surfaces is only stripped and is stuck to the heat source surface and the heat-dissipating assembly respectively, thus the heat source (electronic device) surface and the heat-dissipating material or assembly can be tightly coupled.
Description
Technical field
The present invention relates to a kind of thermally-conductive graphite interface material and manufacturing process thereof, relate in particular to a kind of be used to prevent graphite material or the granule disengaging of graphite composite material surface, the cling film of insulating surface is provided, and make things convenient for product and the manufacturing process that adheres to radiating element.
Background technology
At present, electron trade develops and microminiaturized needs the better heat management system of industrial needs rapidly.As the important component part of electron trade innovation, hot swapping is to be widely used in notebook computer, high performance CPU, mobile electronic device (mobile phone, communication) etc.Heat sink material is divided into isotropism heat sink material and anisotropy heat sink material at present, and stainless steel, aluminium, copper are the isotropism heat sink material, and this class material is all identical at each axial thermal conductivity factor; And the graphite of representing as the anisotropy heat sink material is the crystal form of carbon, with the Van der Waals associative key carbon atom is fixed between each layer in the baseplane, each baseplane is made of the net of hexagon and carbon atom, these baseplanes are flat, fitly arrange along same direction, distance between the two equates to form a crystal, the graphite of high-sequential is made up of quite large-sized crystal, crystal is arranged in together and has the baseplane of marshalling along same direction, it is X/Y and Z axle that graphite-structure has been described to two axles usually, " X/Y " axle is the horizontal direction in the baseplane, very high thermal conductivity is arranged, from 100W/mK～1000W/mK, " Z " then in the vertical direction of baseplane, thermal conductivity factor is lower, from 5W/mK-20W/mK, exactly because different with the thermal conductivity factor of " Z " axle at " X/Y ", graphite becomes the anisotropy heat sink material.
Patent CN2794810 provides the laterally heat exchange material of samming of a kind of vertically disconnected heat.The heat exchange material that this patent relates to is a layer structure, so merely this material is used for the electron trade heat radiation granule delamination is arranged probably, and the easy embrittlement of flexible graphite sheet material is difficult for industrial deep processing.The electric conductivity of graphite is good, and the delamination granule may cause the short circuit phenomenon of electronic device, and the material of graphite product is softer in addition, is scratched easily in the use, so be necessary very much the graphite material surface is handled.Heat Conduction Material is used in the electronic equipment more, and countless chips is arranged on the circuit board, and these equipment are all produced under dustfree environment, so the protection of film need be carried out in the graphite material surface.The breakdown voltage of graphite material is very low, and electronic equipment generally has higher electromotive force, need make insulation processing to the graphite material surface, could satisfy its application in electron trade.
The typical usage of making thermal interfacial material is the hot conduction of computer chip to be connected in cooling set up, so that overcome thermal contact resistance and surperficial inconsistency of fitting between heat dump or cooling package and chip or other thermal source.Usually, thermal interfacial material is made up of high-temperature grease, phase-change material.But its thermal conductivity factor often is not very high, generally have only 2-4W/mK, and vertical thermal conductivity factor of soft graphite has also reached 10-20W/mK, is well suited for this application.The horizontal thermal conductivity factor of soft graphite is up to 450W/mK, so for the electronic equipment of some and non-homogeneous heating, the special superelevation uniform temperature of graphite material makes it in the application aspect the thermally-conductive interface sheet better prospect be arranged again.Another advantage of flexible graphite material is that the matter of material own is soft, so it can fit good with linkage interface.When particularly a surface or two surfaces are not flat fully therein, the space between high temperature resistant pressure sensitive adhesive can be filled up.In addition, the breakdown voltage of graphite material is very low, but electronic equipment generally has higher electromotive force, need make insulation processing to the graphite material surface, and high temperature resistant pressure sensitive adhesive can satisfy the requirement that voltage is worn in resistance simultaneously, has played the effect of getting twice the result with half the effort.
Summary of the invention
Purpose of the present invention is exactly in order to solve existing graphite material as the rapid wear of heat exchange material own, easily cause the shortcoming of the problem of potential safety hazard and thermal source and heat abstractor loose contact; provide a kind of graphite surface cling film process to protect the graphite heat exchange material; handle by this process; can effectively must prevent graphite heat exchange material surface tear; the surface has insulating effect, and has the heat-conducting interface material of thermal conductive resin.
For achieving the above object, technical scheme of the present invention is, the thermally-conductive graphite interface material that provides, its composition comprises graphite material, high temperature resistant pressure sensitive adhesive, parting material, it is characterized in that: described graphite material one side at least is pasted with film by adhesive, be coated with high temperature resistant pressure sensitive adhesive on the film, parting material is posted on pressure sensitive adhesive another one surface respectively.
In technique scheme, described graphite material comprises pure graphite material, flexible graphite material and includes the sheet or the tabular highly heat-conductive material of graphite composition.
In technique scheme, described adhesive is polyurethane adhesive or acrylic acid series pressure sensitive adhesive, and heatproof is greater than 70 degree, and its thickness is below the 5 μ m.
In technique scheme, described thin-film material is the high-temperature insulation film, comprises polyester film, Kapton etc., and its thickness is below the 12 μ m.
In technique scheme, described high temperature resistant pressure sensitive adhesive heatproof is greater than 70 degree, and coating thickness is between 40 μ m～50 μ m, and breakdown voltage can realize the minimum shear bond strength of every square centimeter of about at least 100 grams greater than 0.5KV.
In technique scheme, described parting material is release liners or the mould release membrance of off-type force less than 20g/25mm, can not cause damage to flexible graphite sheet and glue-line during with the speed peel separation material of 300mm/min ± 10mm/min.
For achieving the above object, the present invention has provided a kind of thermally-conductive graphite interface material manufacturing process, and this manufacturing process comprises following operation:
(1) on the graphite material surface or thin-film material surface sprays or the brushing adhesive stick is promptly gone up glue process;
(2) will scribble the heating of the graphite flake of adhesive or film, oven dry is the heating, drying operation;
(3) thin-film material is covered scribble the thin-film material that maybe will scribble adhesive on the adhesive graphite material and overlay on the graphite material, make thin-film material be attached to the graphite material surface through hot pressing, i.e. overlay film, hot pressing attaches operation;
(4) on the parting material shiny surface, smear high temperature resistant pressure sensitive adhesive, i.e. the pressure-sensitive adhesive coating operation;
(5) parting material that will smear high temperature resistant pressure sensitive adhesive is covered on the graphite material, through roll extrusion parting material and graphite material is combined as a whole closely, promptly pastes parting material, rolling technology.
In above-mentioned manufacturing process, described sprinkling, brushing adhesive stick mode are by the coating of print roll coating or scraper type or spray gun adhesive to be evenly distributed on a certain designated surface of graphite material or thin-film material, and adhesive thickness is less than 5 μ m.
In above-mentioned manufacturing process, described heating, drying operation is made heating, drying under 90KPa～95KPa air pressure for passing through constant temperature hot blast or radiation heating system graphite material or the thin-film material at 30 ℃～120 ℃ of following heat drying adhesive coatings by air extractor.
In above-mentioned manufacturing process, described hot pressing attaches operation for utilizing hot pressing roller or hot wafering under 30 ℃～80 ℃ range temperature, through roll extrusion or face pressure film hot-pressing is attached to the graphite material surface, and its pressure is controlled at 0.1MPa～1MPa scope.
In above-mentioned manufacturing process, described roll extrusion is parting material and graphite flake to be combined as a whole closely through the roll extrusion of make-up machine pinch roller, and pressure is controlled at 0.1MPa～1MPa scope.
Advantage of the present invention is, the thin-film material that thermally-conductive graphite interface material attaches, played the surface insulation effect on the one hand, can prevent graphite heat exchange material surface tear effectively in addition, thereby obtain heat-conducting interface material a kind of stable use, that have thermal conductive resin.According to the thermally-conductive graphite interface material that this process obtains, easy to use, after only the release liners on two surfaces need being peeled off, cover thermal source surface and radiating subassembly respectively, thermal source (electronic device) surface and heat sink material or assembly can be combined closely.
Description of drawings
Fig. 1 is the vertical face figure of two-sided overlay film graphite composite material.
Fig. 2 is the vertical face figure of single face overlay film graphite composite material.
Fig. 3 is the scheme of installation that two-sided overlay film graphite composite material is applied in thermal source and radiator
Fig. 4 is the scheme of installation that single face overlay film graphite composite material is applied in thermal source and radiator
Among the figure, 1 is graphite material, and 2 is adhesive, and 3 is film, and 4 is pressure sensitive adhesive, and 5 is parting material, and 6 is the thermal source surface, and 7 is spreader surface.
The specific embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
Embodiment one:
As shown in Figure 1, graphite composite material of the present invention comprises; Flexible graphite platelet 1, polyurethane adhesive 2, PET film 3, temperature pressure sensitive 4 and parting material 5.
In the present embodiment, selecting thickness for use is the flexible graphite sheet 1 of 1mm, and flexible graphite sheet 1 is evenly smeared one deck polyurethane adhesive 2 by the grid upper glue roller with contacted with it of graphite sheet, and control glue thickness is between 2 μ m～3 μ m; The graphite flake 1 that will scribble adhesive again places under the infrared ray and heated two minutes, after taking out and drying, and surface coverage one deck 0.012mm thickness PET film 3; With its combination by the hot pressing roller 60 ℃ of following hot pressing, wherein controlled pressure is 0.5MPa, finishes the flexible graphite sheet single face and answers film.Adhere to one deck PET film 3 according to repeating the another side hot pressing of above-mentioned steps in graphite sheet; Smear high temperature resistant pressure sensitive adhesive 4 on parting material 5 shiny surfaces, bondline thickness 3 μ m are covered on the parting material of 0.008mm on the flexible graphite platelet material, through the roll extrusion of make-up machine pinch roller parting material and graphite flake are combined as a whole closely, and pressure is 0.3MPa.
The thickness of the graphite composite material that this method obtains is 1.06mm, parting material 5 can easily be peeled off with the pressure sensitive adhesive face 4 of graphite material, peel off the back graphite material and can cover thermal source or radiator, as shown in Figure 2, one of them surface pressure covers thermal source surface 6, another side covers spreader surface 7, thereby thermal source is closely linked to each other with radiator, and heat is delivered on the radiator rapidly from thermal source.
Embodiment two
As shown in Figure 1, graphite composite material of the present invention comprises: flexible graphite platelet 1, polyurethane adhesive 2, Kapton 3, temperature pressure sensitive 4 and parting material 5.
In the present embodiment, selecting thickness for use is the flexible graphite sheet 1 of 0.15mm, and flexible graphite sheet 1 is evenly smeared one deck polyurethane adhesive 2 by the scraper coating with contacted with it of graphite sheet, and control glue thickness is between 2 μ m～3 μ m; After will scribbling the graphite flake 1 process constant temperature hot blast heating, drying of adhesive again, surface coverage one deck 0.006mm thickness Kapton 3; With its combination by the hot pressing roller 70 ℃ of following hot pressing, wherein controlled pressure is 0.8MPa, finishes the flexible graphite sheet single face and answers film.Adhere to one deck Kapton 3 according to repeating the another side hot pressing of above-mentioned steps in graphite sheet; Smear high temperature resistant pressure sensitive adhesive on the parting material shiny surface, bondline thickness 3 μ m are covered on the parting material of 0.012mm on the flexible graphite platelet material, through the roll extrusion of make-up machine pinch roller parting material and graphite flake are combined as a whole closely, and pressure is 0.4MPa.
The thickness of the graphite composite material that this method obtains is 0.18mm, parting material 5 can easily be peeled off with the pressure sensitive adhesive face 4 of graphite material, peel off the back graphite material and can cover thermal source or radiator, as shown in Figure 2, one of them surface pressure covers thermal source surface 6, another side covers spreader surface 7, thereby thermal source is closely linked to each other with radiator, and heat is delivered on the radiator rapidly from thermal source.
Claims (1)
1. thermally-conductive graphite interface material manufacturing process, this manufacturing process comprises following operation:
(1) on the graphite material surface or thin-film material surface sprays or the brushing adhesive stick is promptly gone up glue process, described sprinkling, brushing adhesive stick mode are by the coating of print roll coating or scraper type or spray gun adhesive to be evenly distributed on a certain designated surface of graphite material or thin-film material, and adhesive thickness is less than 5 μ m;
(2) will scribble the heating of the graphite material of adhesive or film, oven dry is the heating, drying operation, described heating, drying operation is made heating, drying under 90 KPa ~ 95 KPa air pressure for passing through constant temperature hot blast or radiation heating system at the graphite material or the thin-film material of 30 ℃ ~ 120 ℃ of following heat drying adhesive coatings by air extractor;
(3) thin-film material is covered scribble the thin-film material that maybe will scribble adhesive on the adhesive graphite material and overlay on the graphite material, make thin-film material be attached to the graphite material surface through hot pressing, be that overlay film, hot pressing attach operation, described hot pressing attaches operation for utilizing hot pressing roller or hot wafering under 30 ℃ ~ 80 ℃ range temperature, through roll extrusion or face pressure film hot-pressing is attached to the graphite material surface, its pressure is controlled at 0.1 MPa ~ 1 MPa scope;
(4) on the parting material shiny surface, smear high temperature resistant pressure sensitive adhesive, i.e. the pressure-sensitive adhesive coating operation;
(5) parting material that will smear high temperature resistant pressure sensitive adhesive is covered on the graphite material, through roll extrusion parting material and graphite material are combined as a whole closely, promptly paste parting material, rolling technology, described roll extrusion is parting material and graphite material to be combined as a whole closely through the roll extrusion of make-up machine pinch roller, and pressure is controlled at 0.1 MPa ~ 1 MPa scope.
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| CN 200910027939 CN101712217B (en) | 2009-05-12 | 2009-05-12 | Production process of thermally-conductive graphite interface material |
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| CN 200910027939 CN101712217B (en) | 2009-05-12 | 2009-05-12 | Production process of thermally-conductive graphite interface material |
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| CN101712217A CN101712217A (en) | 2010-05-26 |
| CN101712217B true CN101712217B (en) | 2013-07-31 |
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| CN102039712B (en) * | 2010-11-02 | 2013-01-09 | 中科恒达石墨股份有限公司 | Method for manufacturing graphite foil capable of heat conduction and electricity conduction |
| CN102757736A (en) * | 2011-04-29 | 2012-10-31 | 苏州沛德导热材料有限公司 | Graphite heat conducting adhesive tape and production process thereof |
| CN103582381A (en) * | 2012-07-20 | 2014-02-12 | 苏州沛德导热材料有限公司 | Compressible artificial graphite sheet |
| TW201406537A (en) * | 2012-08-09 | 2014-02-16 | Hugetemp Energy Ltd | Material stacking structure of flexible graphite paper and method of producing flexible graphite paper |
| CN103964416A (en) * | 2013-01-29 | 2014-08-06 | 李忠诚 | Graphite material and production method thereof |
| CN103342993A (en) * | 2013-06-26 | 2013-10-09 | 苏州天脉导热科技有限公司 | Composite material of graphite film and thermal interface material |
| CN104400917A (en) * | 2014-11-04 | 2015-03-11 | 广州橸赛精密机械有限公司 | Graphite sheet cutting process and graphite sheet adapting to process |
| JPWO2017159528A1 (en) * | 2016-03-14 | 2019-01-17 | パナソニックＩｐマネジメント株式会社 | Composite sheet and battery pack using the same |
| CN106833367B (en) * | 2017-02-08 | 2018-04-20 | 昆山市中迪新材料技术有限公司 | A kind of insulated type interface chill bar material and preparation method thereof |
| EP3583622B1 (en) | 2017-02-20 | 2021-04-14 | Lohmann GmbH & Co. KG | Thermal dissipation and electrical isolating device |
| TWI650287B (en) * | 2017-05-04 | 2019-02-11 | 中原大學 | Heat dissipation slurry and heat dissipation structure manufacturing method |
| CN112786728A (en) * | 2021-01-08 | 2021-05-11 | 南京工程学院 | Solar photovoltaic cell with changed texture |
| CN115284711A (en) * | 2022-08-05 | 2022-11-04 | 安徽碳华新材料科技有限公司 | Ultra-wide AFG material with high heat dissipation capacity |
| CN116285749B (en) * | 2023-03-31 | 2023-09-01 | 安徽碳华新材料科技有限公司 | Composite high-conductivity heat dissipation material and processing technology thereof |
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| CN2794810Y (en) * | 2005-06-03 | 2006-07-12 | 耿世达 | Longitudinal heat insulation lateral uniform temperature material |
| CN101225284A (en) * | 2007-01-17 | 2008-07-23 | 卓英社有限公司 | Conductive pressure sensitive adhesive tape |
| CN101247715A (en) * | 2007-02-15 | 2008-08-20 | 保力马科技株式会社 | Thermal diffusion sheet and manufacturing method of the same |
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Patent Citations (4)
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|---|---|---|---|---|
| CN2794810Y (en) * | 2005-06-03 | 2006-07-12 | 耿世达 | Longitudinal heat insulation lateral uniform temperature material |
| CN101225284A (en) * | 2007-01-17 | 2008-07-23 | 卓英社有限公司 | Conductive pressure sensitive adhesive tape |
| CN101247715A (en) * | 2007-02-15 | 2008-08-20 | 保力马科技株式会社 | Thermal diffusion sheet and manufacturing method of the same |
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