CN110831266A - Preparation method of graphene electrothermal film - Google Patents
Preparation method of graphene electrothermal film Download PDFInfo
- Publication number
- CN110831266A CN110831266A CN201911078134.4A CN201911078134A CN110831266A CN 110831266 A CN110831266 A CN 110831266A CN 201911078134 A CN201911078134 A CN 201911078134A CN 110831266 A CN110831266 A CN 110831266A
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- graphene
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- heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
-
- 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
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention relates to the technical field of graphene material preparation, and discloses a preparation method of a graphene electrothermal film, which comprises the following steps: (1) taking graphite powder with the purity of 90% -95%, and heating to 600-1200 ℃ in a vacuum state for 10-16 h; (2) heating to 1600-1800 ℃ for 5-8 h to expand the graphite powder at high temperature; (3) carrying out physical pressing on graphite powder to synthesize a graphene film; (4) heating the graphene film to 2200-2800 ℃ for 8-16 h to crystallize graphite powder to generate graphene crystals; (5) and (3) carrying out membrane circuit arrangement on the graphene membrane to form the graphene electrothermal membrane.
Description
Technical Field
The invention relates to the technical field of graphene material preparation, in particular to a preparation method of a graphene electrothermal film.
Background
At present, the preparation methods of graphite and graphene films commonly used in the prior art are various, and mainly comprise the following steps: spin coating, spray coating, layer-by-layer self-assembly, chemical vapor deposition and the like, but the preparation methods cannot solve the problem of consistent arrangement of carbon atoms in graphene, and a solvent is required to be added in most processes to increase the dispersibility of the graphene, so that the prepared graphene film has certain influence on the high temperature resistance and high pressure resistance when applied at a later stage.
Disclosure of Invention
The invention aims to solve the problems and provides a preparation method of a graphene electrothermal film, and the produced graphene electrothermal film has the characteristics of high electrothermal conversion efficiency and electrothermal radiation conversion efficiency, high temperature resistance, high pressure resistance and the like.
The technical scheme adopted by the invention is as follows:
a preparation method of a graphene electrothermal film is characterized by comprising the following steps:
(1) taking graphite powder with the purity of 90% -95%, and heating to 600-1200 ℃ in a vacuum state for 10-16 h;
(2) heating to 1600-1800 ℃ for 5-8 h to expand the graphite powder at high temperature;
(3) carrying out physical pressing on graphite powder to synthesize a graphene film;
(4) heating the graphene film to 2200-2800 ℃ for 8-16 h to crystallize graphite powder to generate graphene crystals;
(5) and (3) carrying out membrane circuit arrangement on the graphene membrane to form the graphene electrothermal membrane.
Further, the membrane circuit setting process of the step (5) includes the steps of:
(51) calculating to obtain theoretical sheet resistance R through a formula R = (rho/d), wherein rho is the resistivity of the graphene film, and d is the thickness of the graphite film;
(52) measuring a plurality of square resistance values of the graphene film by a voltammetry method, and calculating the average square resistance;
(53) comparing the average sheet resistance with the theoretical sheet resistance, and if the error is within the allowable range, determining that the graphene film is qualified;
(54) cutting and molding the qualified graphene film to form a graphene electrothermal film;
further, the method also comprises the following steps after the step (5):
(6) and packaging the graphene electrothermal film by using an insulating material, wherein the insulating material is one of ceramic, glass, a silica gel mold and mica.
The invention has the beneficial effects that:
(1) the carbon atoms in the graphene are arranged in a better consistent manner, so that the characteristics of the graphene are better shown;
(2) physical pressing is adopted in the process of pressing the synthetic membrane, no solvent or additive is added, resin coating is not needed, and the performance of high temperature resistance and high pressure resistance in the application link is ensured to the maximum extent;
(3) gas volatilization is not generated in the processing process, so that the processing method is environment-friendly and safe;
(4) the produced graphene electrothermal film has the characteristics of high electrothermal conversion efficiency and electrothermal radiation conversion efficiency, high temperature resistance, high pressure resistance and the like.
Detailed Description
The following describes a specific embodiment of the method for preparing the graphene electrothermal film in detail.
The preparation method of the graphene electrothermal film comprises the following steps:
(1) taking graphite powder with the purity of 90% -95%, and heating to 600-1200 ℃ in a vacuum state for 10-16 h;
(2) heating to 1600-1800 ℃ for 5-8 h to expand the graphite powder at high temperature;
(3) carrying out physical pressing on graphite powder to synthesize a graphene film;
(4) heating the graphene film to 2200-2800 ℃ for 8-16 h to crystallize graphite powder to generate graphene crystals;
(5) carrying out membrane circuit setting on the graphene membrane to form a graphene electrothermal membrane, wherein the setting process comprises the following steps:
(51) calculating to obtain theoretical sheet resistance R through a formula R = (rho/d), wherein rho is the resistivity of the graphene film, and d is the thickness of the graphite film;
(52) measuring a plurality of square resistance values of the graphene film by a voltammetry method, and calculating the average square resistance;
(53) comparing the average sheet resistance with the theoretical sheet resistance, and if the error is within the allowable range, determining that the graphene film is qualified;
(54) cutting and molding the qualified graphene film to form a graphene electrothermal film;
(6) and packaging the graphene electrothermal film by using an insulating material, wherein the insulating material is one of ceramic, glass, a silica gel mold and mica.
The packaging process is finished by bonding through roller shaft equipment, and the graphene, mica and other packaging materials are bonded and fixed by a gluing module and a bonding module of the production line to form a graphene electric heating film finished product.
The electrothermal conversion efficiency of the graphene electrothermal film produced by the method is as high as 99.7 percent; under the environment of 22 ℃ and 51% RH, the normal far infrared thermal effect is as high as 85%, and the electrothermal radiation conversion efficiency is as high as 66%; under the environment of 19.4 ℃ and 62% RH, the normal far infrared thermal effect is as high as 88-89%, and the electrothermal radiation conversion efficiency is as high as 56%. The far infrared light wave principle is utilized to realize rapid and comfortable heating (suitable for human temperature sensing), and 20% of energy can be saved; the high-voltage-resistant power cable is high in voltage resistance, and has no power attenuation and long service life when tested under the voltage of 297V.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A preparation method of a graphene electrothermal film is characterized by comprising the following steps: the method comprises the following steps:
(1) taking graphite powder with the purity of 90% -95%, and heating to 600-1200 ℃ in a vacuum state for 10-16 h;
(2) heating to 1600-1800 ℃ for 5-8 h to expand the graphite powder at high temperature;
(3) carrying out physical pressing on graphite powder to synthesize a graphene film;
(4) heating the graphene film to 2200-2800 ℃ for 8-16 h to crystallize graphite powder to generate graphene crystals;
(5) and (3) carrying out membrane circuit arrangement on the graphene membrane to form the graphene electrothermal membrane.
2. The preparation method of the graphene electrothermal film according to claim 1, characterized in that: the membrane circuit setting process of the step (5) includes the steps of:
(51) calculating to obtain theoretical sheet resistance R through a formula R = (rho/d), wherein rho is the resistivity of the graphene film, and d is the thickness of the graphite film;
(52) measuring a plurality of square resistance values of the graphene film by a voltammetry method, and calculating the average square resistance;
(53) comparing the average sheet resistance with the theoretical sheet resistance, and if the error is within the allowable range, determining that the graphene film is qualified;
(54) and cutting and molding the qualified graphene film to form the graphene electrothermal film.
3. The preparation method of the graphene electrothermal film according to claim 1 or 2, characterized in that: the method also comprises the following steps after the step (5):
(6) and packaging the graphene electrothermal film by using an insulating material, wherein the insulating material is one of ceramic, glass, a silica gel mold and mica.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911078134.4A CN110831266A (en) | 2019-11-06 | 2019-11-06 | Preparation method of graphene electrothermal film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911078134.4A CN110831266A (en) | 2019-11-06 | 2019-11-06 | Preparation method of graphene electrothermal film |
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| Publication Number | Publication Date |
|---|---|
| CN110831266A true CN110831266A (en) | 2020-02-21 |
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| CN201911078134.4A Pending CN110831266A (en) | 2019-11-06 | 2019-11-06 | Preparation method of graphene electrothermal film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113682013A (en) * | 2021-08-20 | 2021-11-23 | 河南农业大学 | Preparation method of intelligent formaldehyde-eliminating wood composite material |
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2019
- 2019-11-06 CN CN201911078134.4A patent/CN110831266A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113682013A (en) * | 2021-08-20 | 2021-11-23 | 河南农业大学 | Preparation method of intelligent formaldehyde-eliminating wood composite material |
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Application publication date: 20200221 |