CN113085294A - Graphite flake with controllable thickness and preparation process thereof - Google Patents
Graphite flake with controllable thickness and preparation process thereof Download PDFInfo
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- CN113085294A CN113085294A CN202110456246.XA CN202110456246A CN113085294A CN 113085294 A CN113085294 A CN 113085294A CN 202110456246 A CN202110456246 A CN 202110456246A CN 113085294 A CN113085294 A CN 113085294A
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- 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
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- 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
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- 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
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- 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
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- 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
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
- B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
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- 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
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- 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
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
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- 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
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
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Abstract
The invention discloses a graphite sheet with controllable thickness and a preparation process thereof, wherein the graphite sheet comprises a substrate layer, wherein the substrate layer is positioned at the bottommost layer of the whole graphite sheet structure; the silica gel layer is flatly laid on the upper surface of the substrate layer; the graphite sheet layer is arranged between the substrate layer and the silica gel layer; a PRT protective film covering an upper surface of the graphite sheet layer. According to the graphite flake with the controllable thickness and the preparation process thereof, the graphite flake layer is formed by 2 or more than 2 graphite flake monomers, so that the number of the graphite flake monomers can be increased or reduced in a quantitative overlapping manner when needed, and the integral thickness of the graphite flake and the graphite flake layer can be controlled; through the mode at hot briquetting, simplify the manufacture process of graphite flake, and the coincide hot pressing's that stratum basale, silica gel layer, graphite lamella and PRT protection film also pass through mode makes for the connectivity between stratum basale, silica gel layer, graphite lamella and the PRT protection film is stronger.
Description
Technical Field
The invention relates to the technical field of graphite flake correlation, in particular to a graphite flake with controllable thickness and a preparation process thereof.
Background
The graphite flake is a brand-new heat-conducting and heat-dissipating material, conducts heat uniformly along two directions, shields a heat source and components and improves the performance of consumer electronic products; the laminated structure can be well adapted to any surface, shields heat sources and components, and improves the performance of consumer electronic products. The novel natural graphite solution has high heat dissipation efficiency, small occupied space, light weight, uniform heat conduction along two directions, shielding heat sources and components and improving the performance of consumer electronic products.
However, the existing graphite sheet and the preparation process thereof still have certain defects, such as:
the authorization notice number is: CN 106348287B; and the bulletin such as "graphite sheet and method for manufacturing the same" of 2018.07.06, the present invention provides a graphite sheet having a small contact resistance without using a heat conductive paste and a method for manufacturing the same. A graphite sheet having a surface roughness (Ra) of 10 to less than 40 [ mu ] m and a rate of change of surface irregularities within a distance of 80mm between any 80mm distance within the surface of the graphite sheet is 0.01 to 0.135%. The present invention also provides a method for producing a graphite sheet by heat-treating a polymer film in an inert gas, wherein the polymer film is heat-treated in an atmosphere of the inert gas at a temperature of 2400 ℃ to 3200 ℃, and a pressure of 10kg/cm2 to 100kg/cm2 is applied at a temperature of 2000 ℃ or higher.
However, in the prior art described above: the whole thickness of graphite flake is comparatively single, can not satisfy more user demands, and is used for the preparation technology of graphite flake, and the process is comparatively complicated, and the graphite flake stability of preparing is not good, consequently, we provide a controllable graphite flake of thickness and preparation technology to in solving the problem that proposes in the aforesaid.
Disclosure of Invention
The invention aims to provide a graphite flake with controllable thickness and a preparation process thereof, and aims to solve the problems that most of the graphite flakes proposed in the background art are single in overall thickness and cannot meet more use requirements, and the graphite flake is used for the preparation process of the graphite flake, the process is complex, and the prepared graphite flake is poor in stability.
In order to achieve the purpose, the invention provides the following technical scheme: a graphite sheet having a controlled thickness and a process for its preparation, comprising:
a base layer located at a lowermost layer of the overall graphite sheet structure;
the silica gel layer is flatly laid on the upper surface of the substrate layer, and the thickness of the silica gel layer is 0.2-0.5 mm;
the graphite sheet layer is arranged between the substrate layer and the silica gel layer;
a PRT protective film covering an upper surface of the graphite sheet layer.
Preferably, the substrate layer is composed of cellulose-based fibers, and the specific substrate layer is a cotton woven fabric.
Preferably, the graphite sheet layer is composed of a single graphite sheet, wherein the number of graphite sheets stacked determines the thickness of the graphite sheet layer.
Preferably, the PRT protective film is closely attached to the periphery above the graphite sheet layer, wherein the width dimension of the PRT protective film is 12-18mm, and the thickness dimension of the PRT protective film is 0.3-0.8 mm.
The invention also provides a technical scheme that: a process for the preparation of graphite flakes of controlled thickness, said process comprising the steps of:
the method comprises the following steps: preparing a substrate layer;
step two: preparing a graphite sheet layer;
step three: coating a silica gel layer;
step four: covering a PRT protective film;
step five: and superposing the basal layer, the silica gel layer, the graphite sheet layer and the PRT protective film to prepare the integral structure of the graphite sheet.
Preferably, the base layer is prepared in the first step by using cotton woven cloth as a base material and cutting the cotton woven cloth into a strip-shaped structure for standby by a cutting machine.
Preferably, when the graphite sheet layer is prepared in the second step, the organic polymer is formed by hot pressing, then the organic polymer sheet after hot pressing is sent to a low-temperature heating furnace for carbonization, and then the organic polymer sheet after carbonization is sent to a high-temperature heating furnace for graphitization;
then selecting 2 groups and more than 2 groups of graphite sheet monomers, and preparing the graphite sheet layer by a superposition hot-pressing mode.
Preferably, the temperature of the hot pressing of the organic polymer is controlled at 500-600 ℃, the pressure of the hot pressing of the organic polymer is controlled at 10-15MPa, and the thickness of the graphite sheet monomer is controlled at 0.2-0.5 mm.
Preferably, the temperature of the low temperature furnace is controlled to 800-.
Preferably, in the third step, when the silica gel layer is coated, a small number of times of coating is adopted for coating, and the thickness of the silica gel layer is controlled according to the number of times of coating.
Compared with the prior art, the invention has the beneficial effects that: according to the graphite flake with the controllable thickness and the preparation process thereof, the graphite flake layer is formed by 2 or more than 2 graphite flake monomers, so that the number of the graphite flake monomers can be increased or reduced in a quantitative overlapping manner when needed, and the integral thickness of the graphite flake and the graphite flake layer can be controlled;
through the mode at hot briquetting, simplify the manufacture process of graphite flake, and the coincide hot pressing's that stratum basale, silica gel layer, graphite lamella and PRT protection film also pass through mode makes for the connectivity between stratum basale, silica gel layer, graphite lamella and the PRT protection film is stronger.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a cross-sectional structure of a substrate layer and a silica gel layer in front view;
FIG. 3 is a schematic flow chart of the present invention.
In the figure: 1. a base layer; 2. a silica gel layer; 3. a graphite sheet layer; 4. PRT protective film.
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 embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a graphite sheet with controllable thickness and a preparation process thereof comprise a substrate layer 1, wherein the substrate layer 1 is positioned at the bottommost layer of the whole graphite sheet structure; the silica gel layer 2 is flatly laid on the upper surface of the substrate layer 1, and the thickness of the silica gel layer 2 is 0.2-0.5 mm; the graphite sheet layer 3 is arranged between the substrate layer 1 and the silica gel layer 2; and a PRT protective film 4, wherein the PRT protective film 4 covers the upper surface of the graphite sheet layer 3.
In a further aspect of the present invention, the substrate layer 1 is composed of cellulose-based fibers, and the substrate layer 1 is a cotton fabric.
In a further aspect of the invention, said graphite sheet layer 3 consists of a single graphite sheet, wherein the number of superimposed graphite sheets determines the thickness of the graphite sheet layer 3.
In a further aspect of the present invention, the PRT protective film 4 is closely attached to and disposed around the graphite sheet layer 3, wherein the PRT protective film 4 has a width dimension of 12-18mm, and the PRT protective film 4 has a thickness dimension of 0.3-0.8 mm.
The invention also provides a technical scheme that: a preparation process of graphite flakes with controllable thickness comprises the steps of preparing a substrate layer 1, preparing a graphite flake layer 3, coating a silica gel layer 2, covering a PRT protective film 4 on the graphite flake layer 3, and finally laminating the substrate layer 1, the silica gel layer 2, the graphite flake layer 3 and the PRT protective film 4 to prepare an integral structure of the graphite flake;
the preparation method comprises the following steps of preparing a substrate layer 1, wherein cotton woven cloth is used as a base material, and is cut into a strip-shaped structure for later use by a cutting machine; the substrate layer 1 is used for enhancing the stability of the whole graphite sheet structure;
when the graphite sheet layer 3 is prepared, the organic polymer is molded by hot pressing, then the organic polymer sheet after hot pressing is sent into a low-temperature heating furnace for carbonization, and then the organic polymer sheet after carbonization is sent into a high-temperature heating furnace for graphitization; then selecting 2 groups and more than 2 groups of graphite flake monomers, and preparing a graphite flake layer 3 in a superposition hot pressing mode;
the whole thickness of the graphite flake layer 3 can be controlled according to the number of the single graphite flake, so that the whole structure of the graphite flake can be suitable for different use requirements;
when the graphite sheet layer 3 is prepared, the hot-pressing temperature of the organic polymer is controlled to be 500-600 ℃, the hot-pressing pressure of the organic polymer is controlled to be 10-15MPa, and the thickness of the graphite sheet monomer is controlled to be 0.2-0.5 mm; the temperature of the low temperature heating furnace needs to be controlled to 800-1100 ℃ during carbonization treatment, and the temperature of the high temperature heating furnace needs to be controlled to 2300-2800 ℃ during graphitization treatment.
In addition, when coating the silica gel layer 2, a small amount of coating modes are adopted for coating for many times, the thickness of the silica gel layer 2 is controlled according to the coating times, and the silica gel layer 2 is used for heat dissipation of the whole graphite sheet.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Those not described in detail in this specification are within the skill of the art. The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A graphite sheet of controlled thickness, comprising:
a substrate layer (1), the substrate layer (1) being located at the lowermost layer of the overall graphite sheet structure;
the silica gel layer (2) is flatly laid on the upper surface of the substrate layer (1), and the thickness of the silica gel layer (2) is 0.2-0.5 mm;
the graphite sheet layer (3), the graphite sheet layer (3) is arranged between the substrate layer (1) and the silica gel layer (2);
and a PRT protective film (4), wherein the PRT protective film (4) covers the upper surface of the graphite sheet layer (3).
2. A graphite sheet of controlled thickness according to claim 1, wherein: the base layer (1) is composed of cellulose-based fibers, and the specific base layer (1) is a cotton fabric.
3. A graphite sheet of controlled thickness according to claim 1, wherein: the graphite sheet layer (3) is composed of single graphite sheets, wherein the number of the overlapped graphite sheets determines the thickness of the graphite sheet layer (3).
4. A graphite sheet of controlled thickness according to claim 1, wherein: the PRT protective film (4) is closely attached to the periphery above the graphite sheet layer (3), wherein the width dimension of the PRT protective film (4) is about 12-18mm, and the thickness dimension of the PRT protective film (4) is about 0.3-0.8 mm.
5. A preparation process of graphite flakes with controllable thickness is characterized by comprising the following steps: the preparation process comprises the following steps:
the method comprises the following steps: preparing a substrate layer (1);
step two: preparing a graphite sheet layer (3);
step three: coating a silica gel layer (2);
step four: covering a PRT protective film (4);
step five: and superposing the substrate layer (1), the silica gel layer (2), the graphite sheet layer (3) and the PRT protective film (4) to prepare the graphite sheet integral structure.
6. A process according to claim 5 for the preparation of graphite flakes of controlled thickness, wherein: the base layer (1) is prepared in the first step by adopting cotton woven cloth as a base material and cutting the cotton woven cloth into a strip-shaped structure for later use through a cutting machine.
7. A process according to claim 5 for the preparation of graphite flakes of controlled thickness, wherein: when the graphite sheet layer (3) is prepared in the second step, the organic polymer is molded in a hot pressing mode, then the organic polymer sheet after hot pressing is sent into a low-temperature heating furnace for carbonization, and then the organic polymer sheet after carbonization is sent into a high-temperature heating furnace for graphitization;
then selecting 2 groups and more than 2 groups of graphite flake monomers, and preparing the graphite flake layer (3) by a superposition hot-pressing mode.
8. A process according to claim 7 for the preparation of graphite flakes of controlled thickness, wherein: the hot-pressing temperature of the organic polymer is controlled at 500-600 ℃, the hot-pressing pressure of the organic polymer is controlled at 10-15MPa, and the thickness of the graphite sheet monomer is controlled at 0.2-0.5 mm.
9. A process according to claim 7 for the preparation of graphite flakes of controlled thickness, wherein: the temperature of the low-temperature heating furnace is required to be controlled to 800-1100 ℃ during the carbonization treatment, and the temperature of the high-temperature heating furnace is required to be controlled to 2300-2800 ℃ during the graphitization treatment.
10. A process according to claim 5 for the preparation of graphite flakes of controlled thickness, wherein: and step three, when the silica gel layer (2) is coated, coating is carried out by adopting a small number of times of coating, and the thickness of the silica gel layer (2) is controlled according to the number of times of coating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110456246.XA CN113085294A (en) | 2021-04-26 | 2021-04-26 | Graphite flake with controllable thickness and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110456246.XA CN113085294A (en) | 2021-04-26 | 2021-04-26 | Graphite flake with controllable thickness and preparation process thereof |
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| CN113085294A true CN113085294A (en) | 2021-07-09 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014083786A (en) * | 2012-10-25 | 2014-05-12 | Lignyte Co Ltd | Graphite sheet composite material and method for producing the same |
| CN104495795A (en) * | 2014-11-24 | 2015-04-08 | 云南云天化股份有限公司 | Graphite flake and preparation method thereof |
| CN209625819U (en) * | 2019-05-23 | 2019-11-12 | 东莞市兴瑞新能源有限公司 | A kind of graphite flake |
| CN210381721U (en) * | 2019-06-18 | 2020-04-21 | 东莞市兴瑞新能源有限公司 | Be applied to heat dissipation sheet of mobile phone motherboard |
-
2021
- 2021-04-26 CN CN202110456246.XA patent/CN113085294A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014083786A (en) * | 2012-10-25 | 2014-05-12 | Lignyte Co Ltd | Graphite sheet composite material and method for producing the same |
| CN104495795A (en) * | 2014-11-24 | 2015-04-08 | 云南云天化股份有限公司 | Graphite flake and preparation method thereof |
| CN209625819U (en) * | 2019-05-23 | 2019-11-12 | 东莞市兴瑞新能源有限公司 | A kind of graphite flake |
| CN210381721U (en) * | 2019-06-18 | 2020-04-21 | 东莞市兴瑞新能源有限公司 | Be applied to heat dissipation sheet of mobile phone motherboard |
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