CN103770415A - Heat conduction graphite sheet and manufacturing method thereof - Google Patents
Heat conduction graphite sheet and manufacturing method thereof Download PDFInfo
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- CN103770415A CN103770415A CN201410038241.5A CN201410038241A CN103770415A CN 103770415 A CN103770415 A CN 103770415A CN 201410038241 A CN201410038241 A CN 201410038241A CN 103770415 A CN103770415 A CN 103770415A
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Abstract
The invention discloses a heat conduction graphite sheet and a manufacturing method thereof. The heat conduction graphite sheet consists of a polyimide film, a first coating layer and a second coating layer, wherein the first coating layer and the second coating layer are positioned on the upper and lower surfaces of the polyimide film respectively and are formed by sintering graphite modifiers respectively; each graphite modifier consists of the following components in parts by weight: 20-25 parts of benzophenonetetracarboxylic dianhydride, 14-16 parts of benzenetetracarboxylic anhydride, 22-26 parts of diaminodiphenylmethane, 20-25 parts of dimethyl formamide, 8-10 parts of N-methyl pyrrolidinone, 1.8-2.5 parts of ethylene glycol and 2.5-3 parts of polydimethylsiloxane. The heat conduction performance of the heat conduction graphite sheet is improved in the vertical direction and the horizontal direction, local overheating is avoided, the uniformity of the heat conduction performance is realized, and meanwhile, the stability and reliability of the heat dissipation performance of a product are improved; the cost of the product is greatly reduced.
Description
Technical field
The present invention relates to a kind of conductive graphite sheet and manufacture method thereof, belong to graphite flake technical field.
Background technology
Along with modern microelectric technique high speed development, electronic equipment (as notebook computer, mobile phone, panel computer etc.) becomes ultra-thin, light day by day, this structure obviously improves electronic equipment internal power density, and in service produced heat is difficult for discharging, be easy to run-up and form high temperature.On the other hand, high temperature can reduce performance, reliability and the service life of electronic equipment.Therefore, current electron trade proposes more and more higher requirement for the heat sink material as heat control system core component, rapidly heat is passed in the urgent need to a kind of high-efficiency heat conduction, light material, ensures that electronic equipment normally moves.
In prior art, Kapton is used for greatly flexible PCB, although there is the polyimide film sintered acquisition graphite heat radiation fin of employing, thereby paste on thermal source, but be limited to product quality and performances very different of Kapton, have influence on the performance of the two-sided pad pasting heat dispersion that dispels the heat, there is following technical problem: dispel the heat inhomogeneous, be prone to hot-spot, the heat dispersion that improved product is unstable, reliability performance is poor, be unfavorable for product quality management control, affect the competitiveness of product.
Summary of the invention
First goal of the invention of the present invention is to provide a kind of conductive graphite sheet, this conductive graphite sheet has all improved heat conductivility with horizontal direction in the vertical direction, avoid hot-spot, realize the inhomogeneity while of heat conductivility, improve heat dispersion stability, the reliability of product, greatly reduced the cost of product; Second goal of the invention of the present invention is to provide a kind of manufacture method of conductive graphite sheet.
For reaching above-mentioned first goal of the invention, the technical solution used in the present invention is: a kind of conductive graphite sheet, described conductive graphite sheet is made up of Kapton, the first coat and the second coat, and described the first coat, the second coat lay respectively at the upper and lower surface of Kapton;
Described the first coat, the second coat form by graphite modified dose of sintering, and the graphite modified dose of component by following weight portion forms:
20 ~ 25 parts of benzophenone tetracarboxylic dianhydrides,
14 ~ 16 parts of pyromellitic acid anhydrides,
22 ~ 26 parts of MDAs,
20 ~ 25 parts of dimethyl formamides,
8 ~ 10 parts of 1-METHYLPYRROLIDONEs,
1.8 ~ 2.5 parts of ethylene glycol,
2.5 ~ 3 parts of dimethyl silicone polymers.
For reaching above-mentioned second goal of the invention, the technical solution used in the present invention is: a kind of manufacture method of conductive graphite sheet, and described conductive graphite sheet obtains by following steps:
Step 1, apply respectively on the upper and lower surface of Kapton graphite modified dose obtain Kapton after treatment, Kapton after treatment is made up of Kapton, the first coat and the second coat, and the viscosity of described graphite modified dose is 30000 ~ 48000CP;
Described graphite modified dose of component by following weight portion forms:
20 ~ 25 parts of benzophenone tetracarboxylic dianhydrides,
14 ~ 16 parts of pyromellitic acid anhydrides,
22 ~ 26 parts of MDAs,
20 ~ 25 parts of dimethyl formamides,
8 ~ 10 parts of 1-METHYLPYRROLIDONEs,
1.8 ~ 2.5 parts of ethylene glycol,
2.5 ~ 3 parts of dimethyl silicone polymers;
Step 2, cooling after Kapton after treatment is warming up to 1200 ℃, thus the carbonized film of pre-burned obtained;
Step 3, employing calender roll the carbonized film of the pre-burned of described step 4;
Step 4, cooling after carbonized film is warming up to 2850 ℃ ~ 2950 ℃, thus the main graphite film of firing obtained;
Step 5, then thereby graphite film that the master of step 4 gained is fired rolls and obtains described conductive graphite sheet.
Because technique scheme is used, the present invention compared with prior art has following advantages and effect:
1, this conductive graphite sheet and manufacture method thereof, the Kapton that in its structure, graphite linings all applies graphite modified dose of one deck by upper and lower surface is prepared from, improve in the vertical direction and the heat conductivility of horizontal direction, avoided hot-spot, realized the uniformity of heat conductivility; Secondly, it is positioned at graphite modified dose of Kapton surface and is made up of 2.5 ~ 3 parts of 20 ~ 25 parts of benzophenone tetracarboxylic dianhydrides, 14 ~ 16 parts of pyromellitic acid anhydrides, 22 ~ 26 parts of MDAs, 20 ~ 25 parts of dimethyl formamides, 8 ~ 10 parts of 1-METHYLPYRROLIDONEs, 1.8 ~ 2.5 parts of ethylene glycol, dimethyl silicone polymer, be coated on Kapton, fill the pin hole in heating process, improve degree of crystallinity simultaneously, also overcome excessive cause inhomogeneous of thermal contraction, improved graphite linings biaxial tension performance.
2, conductive graphite sheet of the present invention and manufacture method thereof, it is positioned at 2.5 ~ 3 parts of compositions of 1.8 ~ 2.5 parts of 8 ~ 10 parts of 20 ~ 25 parts of 22 ~ 26 parts of 14 ~ 16 parts of 20 ~ 25 parts of graphite modified dose of benzophenone tetracarboxylic dianhydrides, pyromellitic acid anhydrides, MDAs, dimethyl formamides, 1-METHYLPYRROLIDONEs, ethylene glycol, dimethyl silicone polymer on Kapton surface, adopt 8 ~ 10 parts of 20 ~ 25 parts of dimethyl formamides, 1-METHYLPYRROLIDONE to reduce azeotropic point and level and smooth boiling point district, improved flatness and the pliability of final products film forming.
3, conductive graphite sheet of the present invention and manufacture method thereof, between the carbonized film of pre-burned and graphitization, increase calendering step, and again roll after forming again conductive graphite sheet, avoid the volume contraction in fold and graphitization sintering process, improve compactness and degree of crystallinity, further improved in the vertical direction the heat conductivility with horizontal direction.
Accompanying drawing explanation
Accompanying drawing 1 is conductive graphite chip architecture schematic diagram of the present invention.
In above accompanying drawing: 1, conductive graphite sheet; 2, Kapton; 3, the first coat; 4, the second coat.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment: a kind of conductive graphite sheet, described conductive graphite sheet 1 is made up of Kapton 2, the first coat 3 and the second coat 4, and described the first coat 3, the second coat 4 lay respectively at the upper and lower surface of Kapton 2;
Described the first coat, the second coat form by graphite modified dose of sintering, and the graphite modified dose of component by following weight portion forms;
Described graphite modified dose 4 component by following weight portion forms, as shown in table 1:
Table 1
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Benzophenone tetracarboxylic dianhydride | 23 | 22 | 24.5 | 22.5 | 21 |
| Pyromellitic acid anhydride | 14 | 15 | 16 | 14.5 | 15.5 |
| MDA | 23.5 | 25 | 22.5 | 24 | 24.5 |
| Dimethyl formamide | 20 | 23 | 24.5 | 22 | 21 |
| 1-METHYLPYRROLIDONE | 10 | 9 | 8.5 | 9.5 | 8 |
| Ethylene glycol | 2 | 1.8 | 2 | 2.5 | 2.2 |
| Dimethyl silicone polymer | 2.5 | 2.7 | 3 | 2.6 | 2.8 |
A preparation method for above-mentioned conductive graphite sheet, described conductive graphite sheet 1 obtains by following steps:
Step 1, apply respectively on the upper and lower surface of Kapton 2 graphite modified dose obtain Kapton after treatment, Kapton after treatment is made up of Kapton 2, the first coat 3 and the second coat 4, and the viscosity of described graphite modified dose is 30000 ~ 48000CP;
Described graphite modified dose of component by following weight portion forms:
Table 2
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Benzophenone tetracarboxylic dianhydride | 23 | 22 | 24.5 | 22.5 | 21 |
| Pyromellitic acid anhydride | 14 | 15 | 16 | 14.5 | 15.5 |
| MDA | 23.5 | 25 | 22.5 | 24 | 24.5 |
| Dimethyl formamide | 20 | 23 | 24.5 | 22 | 21 |
| 1-METHYLPYRROLIDONE | 10 | 9 | 8.5 | 9.5 | 8 |
| Ethylene glycol | 2 | 1.8 | 2 | 2.5 | 2.2 |
| Dimethyl silicone polymer | 2.5 | 2.7 | 3 | 2.6 | 2.8 |
Step 2, cooling after Kapton after treatment is warming up to 1200 ℃, thus the carbonized film of pre-burned obtained;
Step 3, employing calender roll the carbonized film of the pre-burned of described step 4;
Step 4, cooling after carbonized film is warming up to 2850 ℃ ~ 2950 ℃, thus the main graphite film of firing obtained;
Step 5, then thereby graphite film that the master of step 4 gained is fired rolls and obtains described conductive graphite sheet 1.
While adopting above-mentioned stretch-proof heat radiation graphite paster, the Kapton that in its structure, graphite linings all applies graphite modified dose of one deck by upper and lower surface is prepared from, improve in the vertical direction and the heat conductivility of horizontal direction, avoided hot-spot, realized the uniformity of heat conductivility, secondly, its graphite modified dose of being positioned at Kapton surface is by 20 ~ 25 parts of benzophenone tetracarboxylic dianhydrides, 12 ~ 18 parts of pyromellitic acid anhydrides, 20 ~ 28 parts of MDAs, 30 ~ 35 parts of dimethyl formamides, 1.5 ~ 2.5 parts of ethylene glycol, 2 ~ 3 parts of compositions of dimethyl silicone polymer, be coated on Kapton, fill the pin hole in heating process, improve degree of crystallinity simultaneously, also overcome excessive cause inhomogeneous of thermal contraction, improve graphite linings biaxial tension performance, also azeotropic point and level and smooth boiling point district have been reduced, flatness and the pliability of final products film forming are improved, again, Kapton surface has graphite modified dose, graphite linings and heat-conducting glue adhesion coating heat conductivility in two-sided pad pasting are improved, and adopt calender to roll the carbonized film of described pre-burned, avoid the volume contraction in fold and graphitization sintering process, improve compactness and degree of crystallinity, further improved in the vertical direction the heat conductivility with horizontal direction.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. a conductive graphite sheet, it is characterized in that: described conductive graphite sheet (1) is made up of Kapton (2), the first coat (3) and the second coat (4), described the first coat (3), the second coat (4) lay respectively at the upper and lower surface of Kapton (2);
Described the first coat, the second coat form by graphite modified dose of sintering, and the graphite modified dose of component by following weight portion forms:
20 ~ 25 parts of benzophenone tetracarboxylic dianhydrides,
14 ~ 16 parts of pyromellitic acid anhydrides,
22 ~ 26 parts of MDAs,
20 ~ 25 parts of dimethyl formamides,
8 ~ 10 parts of 1-METHYLPYRROLIDONEs,
1.8 ~ 2.5 parts of ethylene glycol,
2.5 ~ 3 parts of dimethyl silicone polymers.
2. a preparation method for conductive graphite sheet described in claim 1, is characterized in that: described conductive graphite sheet (1) obtains by following steps:
Step 1, apply respectively on the upper and lower surface of Kapton (2) graphite modified dose obtain Kapton after treatment, Kapton after treatment is made up of Kapton (2), the first coat (3) and the second coat (4), and the viscosity of described graphite modified dose is 30000 ~ 48000CP;
Described graphite modified dose of component by following weight portion forms:
20 ~ 25 parts of benzophenone tetracarboxylic dianhydrides,
14 ~ 16 parts of pyromellitic acid anhydrides,
22 ~ 26 parts of MDAs,
20 ~ 25 parts of dimethyl formamides,
8 ~ 10 parts of 1-METHYLPYRROLIDONEs,
1.8 ~ 2.5 parts of ethylene glycol (viscosity adjusting),
2.5 ~ 3 parts of dimethyl silicone polymers (viscosity adjusting);
Step 2, cooling after Kapton after treatment is warming up to 1200 ℃, thus the carbonized film of pre-burned obtained;
Step 3, employing calender roll the carbonized film of the pre-burned of described step 4;
Step 4, cooling after carbonized film is warming up to 2850 ℃ ~ 2950 ℃, thus the main graphite film of firing obtained;
Step 5, then thereby graphite film that the master of step 4 gained is fired rolls and obtains described conductive graphite sheet (1).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410038241.5A CN103770415B (en) | 2014-01-26 | 2014-01-26 | Heat conduction graphite sheet and manufacturing method thereof |
| CN201510285674.5A CN104883858B (en) | 2014-01-26 | 2014-01-26 | The conductive graphite piece of high tensile property |
| CN201510285550.7A CN104944416B (en) | 2014-01-26 | 2014-01-26 | Preparation method for high compactness graphite flake |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410038241.5A CN103770415B (en) | 2014-01-26 | 2014-01-26 | Heat conduction graphite sheet and manufacturing method thereof |
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| CN201510285550.7A Division CN104944416B (en) | 2014-01-26 | 2014-01-26 | Preparation method for high compactness graphite flake |
| CN201510285674.5A Division CN104883858B (en) | 2014-01-26 | 2014-01-26 | The conductive graphite piece of high tensile property |
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| CN103770415A true CN103770415A (en) | 2014-05-07 |
| CN103770415B CN103770415B (en) | 2015-07-22 |
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| CN201510285550.7A Active CN104944416B (en) | 2014-01-26 | 2014-01-26 | Preparation method for high compactness graphite flake |
| CN201510285674.5A Active CN104883858B (en) | 2014-01-26 | 2014-01-26 | The conductive graphite piece of high tensile property |
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| CN201510285674.5A Active CN104883858B (en) | 2014-01-26 | 2014-01-26 | The conductive graphite piece of high tensile property |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106243993A (en) * | 2016-07-29 | 2016-12-21 | 芜湖迈特电子科技有限公司 | A kind of composite heat-conducting graphite flake |
| CN111394000A (en) * | 2020-05-07 | 2020-07-10 | 东莞市星勤胶粘制品有限公司 | Heat dissipation type conductive double-sided adhesive tape and production process thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231865A (en) * | 2016-07-29 | 2016-12-14 | 芜湖迈特电子科技有限公司 | A kind of Novel heat-conducting graphite flake and manufacture method thereof |
| KR102094925B1 (en) * | 2018-05-03 | 2020-03-30 | 에스케이씨 주식회사 | Multilayer graphite sheet having excellent electromagnetic shielding property and thermal conductivity, and preparation method thereof |
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| EP1661856A1 (en) * | 2003-09-02 | 2006-05-31 | Kaneka Corporation | Filmy graphite and process for producing the same |
| WO2010150300A1 (en) * | 2009-06-22 | 2010-12-29 | 株式会社カネカ | Graphite film and process for producing graphite film |
| US20110265980A1 (en) * | 2009-07-13 | 2011-11-03 | Kazuhiko Kubo | Graphite sheet and heat transfer structure using same |
| CN103011141A (en) * | 2012-12-20 | 2013-04-03 | 宁波今山新材料有限公司 | Method for manufacturing high thermal conductivity graphite film |
| CN103043657A (en) * | 2012-12-28 | 2013-04-17 | 苏州斯迪克新材料科技股份有限公司 | Graphite radiation fin for adhesive tapes |
| CN103045119A (en) * | 2012-12-28 | 2013-04-17 | 苏州斯迪克新材料科技股份有限公司 | Heat-dissipating double-sided adhesive tape with ultrahigh heat conductivity coefficient |
| CN103059761A (en) * | 2012-12-28 | 2013-04-24 | 斯迪克新型材料（江苏）有限公司 | High-heat conductivity coefficient graphite heat-radiation adhesive tape |
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2014
- 2014-01-26 CN CN201410038241.5A patent/CN103770415B/en active Active
- 2014-01-26 CN CN201510285550.7A patent/CN104944416B/en active Active
- 2014-01-26 CN CN201510285674.5A patent/CN104883858B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1661856A1 (en) * | 2003-09-02 | 2006-05-31 | Kaneka Corporation | Filmy graphite and process for producing the same |
| WO2010150300A1 (en) * | 2009-06-22 | 2010-12-29 | 株式会社カネカ | Graphite film and process for producing graphite film |
| US20110265980A1 (en) * | 2009-07-13 | 2011-11-03 | Kazuhiko Kubo | Graphite sheet and heat transfer structure using same |
| CN103011141A (en) * | 2012-12-20 | 2013-04-03 | 宁波今山新材料有限公司 | Method for manufacturing high thermal conductivity graphite film |
| CN103043657A (en) * | 2012-12-28 | 2013-04-17 | 苏州斯迪克新材料科技股份有限公司 | Graphite radiation fin for adhesive tapes |
| CN103045119A (en) * | 2012-12-28 | 2013-04-17 | 苏州斯迪克新材料科技股份有限公司 | Heat-dissipating double-sided adhesive tape with ultrahigh heat conductivity coefficient |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106243993A (en) * | 2016-07-29 | 2016-12-21 | 芜湖迈特电子科技有限公司 | A kind of composite heat-conducting graphite flake |
| CN111394000A (en) * | 2020-05-07 | 2020-07-10 | 东莞市星勤胶粘制品有限公司 | Heat dissipation type conductive double-sided adhesive tape and production process thereof |
| CN111394000B (en) * | 2020-05-07 | 2021-10-08 | 东莞市星勤胶粘制品有限公司 | Heat dissipation type conductive double-sided adhesive tape and production process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104883858A (en) | 2015-09-02 |
| CN104883858B (en) | 2017-06-30 |
| CN104944416B (en) | 2017-10-27 |
| CN104944416A (en) | 2015-09-30 |
| CN103770415B (en) | 2015-07-22 |
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