CN111586903A - Graphene-containing conductive slurry for high-temperature heating film and preparation method thereof - Google Patents
Graphene-containing conductive slurry for high-temperature heating film and preparation method thereof Download PDFInfo
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Images
Classifications
-
- 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
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/18—Conductive material dispersed in non-conductive inorganic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- 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
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
Abstract
The application relates to a preparation method of conductive paste containing graphene for a high-temperature heating film, which is characterized by comprising the following steps: s1: expanding expandable inorganic aluminosilicate in water to obtain an expanded inorganic aluminosilicate solution or slurry; s2: and mixing and dispersing the graphene slurry and the expanded inorganic aluminosilicate solution or slurry obtained in the step S1 to obtain the conductive slurry containing graphene for the high-temperature heating film. The application also relates to the conductive paste containing graphene for the high-temperature heating film, which is prepared by the preparation method. The present application also relates to a high temperature heating film made using the conductive paste as described above. The conductive paste has the advantages of wide raw material source, simple process, low cost and environmental protection because no organic solvent is needed. The high-temperature heating film prepared by the conductive paste has the advantages of high resistance, high temperature resistance and flexibility.
Description
Technical Field
The invention relates to the technical field of conductive paste and graphene, in particular to conductive paste containing graphene for a high-temperature heating film and a preparation method of the conductive paste.
Background
At present, the conductive paste for the electric heating film in the market mainly comprises conductive silver paste, graphene conductive paste, carbon nanotube conductive paste and the like. An insulating material or an organic auxiliary agent is usually added to increase the resistance of the conductive paste.
The Chinese patent application with publication number CN107493612A reports a flexible nano carbon composite high-temperature electric heating film and a preparation method thereof. The patent application discloses that the electric heating film slurry is composed of a solid material and a solvent, wherein the solid material is composed of graphite, carbon black, silver, zinc oxide and rare earth materials with specific proportion and particle size of 50nm, and the solvent is composed of xylene, dimethyl amide, polyamide resin and polyimide high polymer solution with specific proportion. The electric heating film paste disclosed in the patent document uses a large amount of organic solvent, resulting in a potential environmental pollution problem.
Chinese patent application publication No. CN109741854A reports "a high temperature resistant conductive paste for graphene heating film and a preparation method thereof", which uses conductive silver powder as a main material, and adds a high temperature resistant resin, an organic solvent and the like to prepare the high temperature resistant conductive paste for graphene heating film. The Chinese patent application with publication number CN109671516A reports a method for preparing and using electrical heating resistance paste. The electric heating resistance paste is prepared by stirring and grinding micron-sized ball-like silver powder, ethyl cellulose, lead-free glass powder, a solvent and an auxiliary agent, and a heating film is obtained by high-temperature sintering. The two methods both use conductive silver powder as a main substance, have higher production cost, and the use of organic solvents is also not environment-friendly and faces the potential problem of environmental pollution.
Therefore, the development of a low-cost environment-friendly conductive slurry for a high-temperature heating film and a preparation method thereof are urgently needed in the field.
Disclosure of Invention
The present application aims to provide a preparation method of a conductive paste containing graphene for a high-temperature heating film, which is low in cost and environment-friendly, so as to solve the technical problems in the prior art. Specifically, the preparation method of the conductive paste for the graphene-containing high-temperature heating film includes the steps of fully expanding environment-friendly inorganic aluminosilicate with high-temperature stability and a lamellar structure in water to obtain an expanded inorganic aluminosilicate solution or paste, and then mixing and dispersing the expanded inorganic aluminosilicate solution or paste and the graphene paste to obtain the conductive paste for the graphene-containing high-temperature heating film.
The present application also aims to provide a graphene-containing conductive paste for an environmentally-friendly high-temperature heating film prepared by the preparation method.
It is also an object of the present application to provide a high temperature heating film made of the conductive paste according to the second aspect.
In order to solve the above technical problem, the present application provides the following technical solutions.
In a first aspect, the present application provides a method for preparing a conductive paste for a graphene-containing high-temperature heating film, the method comprising the steps of:
s1: expanding expandable inorganic aluminosilicate in water to obtain an expanded inorganic aluminosilicate solution or slurry;
s2: and mixing and dispersing the graphene slurry and the expanded inorganic aluminosilicate solution or slurry obtained in the step S1 to obtain the conductive slurry containing graphene for the high-temperature heating film.
In one embodiment of the first aspect, swelling the swellable inorganic aluminosilicate in water in step S1 includes dissolving the swellable inorganic aluminosilicate in water and ultrasonically agitating for a first predetermined period of time.
In one embodiment of the first aspect, in step S1, the power of the ultrasonic agitation is 100-500W; the first predetermined period of time is 0.5-5 h.
In one embodiment of the first aspect, in step S2, the graphene slurry is sanded prior to mixing with the expanded inorganic aluminosilicate solution or slurry.
In one embodiment of the first aspect, the mixing and dispersing the graphene slurry and the expanded inorganic aluminosilicate solution or slurry in step S2 includes mixing the graphene slurry and the expanded inorganic aluminosilicate solution or slurry, and then dispersing the resulting mixture, the dispersing including one or more of ultrasonic stirring, high-speed mechanical stirring, emulsification and sanding.
In one embodiment of the first aspect, in step S1, the swellable inorganic aluminosilicate is montmorillonite.
In one embodiment of the first aspect, in step S2, the graphene slurry has a solid content of 3% to 6% by mass.
In one embodiment of the first aspect, in step S2, the mass ratio of the graphene to the expandable inorganic aluminosilicate is 1: 2-1: 5.
in a second aspect, the present application provides a conductive paste for a graphene-containing high-temperature heating film prepared by the method for preparing a conductive paste for a graphene-containing high-temperature heating film according to the first aspect.
In a third aspect, the present application provides a high-temperature heating film prepared from the conductive paste for a graphene-containing high-temperature heating film according to the second aspect.
Compared with the prior art, the conductive paste has the advantages of wide raw material source, simple process, low cost and environmental friendliness due to no need of organic solvent. The thickness of the high-temperature heating film prepared by the conductive paste is 10-200 um, the sheet resistance measured by a four-probe is 50-500 omega/sq, and the high-temperature heating film does not break after being bent for 500 times at 180 degrees and has the advantages of high resistance, high temperature resistance and flexibility.
Drawings
The present application may be better understood by describing embodiments thereof in conjunction with the following drawings, in which:
fig. 1 shows a schematic view of a graphene composite montmorillonite heating film according to an embodiment of the present invention;
fig. 2 shows a scanning electron microscope picture of the surface of the graphene composite montmorillonite heating film according to example 1;
fig. 3 shows a scanning electron microscope picture of a cross section of the graphene composite montmorillonite heating film according to example 1;
fig. 4 shows a schematic structural diagram of a graphene (composite) heating film for testing.
In the above drawings, reference numeral 100 denotes a montmorillonite layer, 200 denotes a graphene layer, 300 denotes a graphene (composite) heating film, 400 denotes a copper foil as an edge seal of the graphene heating film and an electrically conductive connection of the heating film to a copper wire, and 500 denotes a copper wire.
Detailed Description
Unless otherwise defined, technical or scientific terms used herein in the specification and claims should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All numerical values recited herein as between the lowest value and the highest value are intended to mean all values between the lowest value and the highest value in increments of one unit when there is more than two units difference between the lowest value and the highest value.
In the following detailed description of the embodiments of the present invention, reference is made to the accompanying drawings, which are included to provide a further understanding of the invention, and in which is shown by way of illustration specific embodiments in which the invention may be practiced.
Definition of terms
Herein, the term "high temperature heating film" refers to an electrothermal film having an operating temperature of 300-450 ℃.
As used herein, the term "high resistance" refers to a square resistance of the heating film of 50 Ω/sq or more as measured by a four-probe.
As described above, in the conductive paste for a high-temperature heating film of the related art, an organic solvent is required to obtain high resistance and high-temperature resistance characteristics, regardless of whether a metal or a carbon material is used as a main conductive material. This can present a potential personal hazard to the operator and potentially create environmental pollution problems. When silver is used as the main conductive material, the conductive paste is expensive.
For this reason, there is a strong need in the art to develop a conductive paste for a high-temperature heating film that is low in cost and environmentally friendly. The application firstly provides a preparation method of the conductive slurry containing graphene for the high-temperature heating film, which is low in cost and environment-friendly. Specifically, the preparation method of the conductive paste for the graphene-containing high-temperature heating film includes the steps of fully expanding environment-friendly inorganic aluminosilicate with high-temperature stability and a lamellar structure in water to obtain an expanded inorganic aluminosilicate solution or paste, and then mixing and dispersing the expanded inorganic aluminosilicate solution or paste and the graphene paste to obtain the conductive paste for the graphene-containing high-temperature heating film.
In one embodiment, by compounding lamellar graphene with inorganic montmorillonite having a lamellar structure, the resistance of a film made of graphene/montmorillonite composite conductive paste is regulated by the insulating properties of montmorillonite. In a preferred embodiment, the method for preparing the conductive paste comprises the steps of firstly dissolving the montmorillonite in water to fully swell, then performing ultrasonic further swelling and stripping, adding few-layer graphene into the swelled montmorillonite, and compounding the graphene and the montmorillonite in a mode of ultrasonic, high-speed mechanical stirring, emulsification, sand grinding and the like to obtain the graphene/montmorillonite composite conductive paste. According to the mass ratio of the graphene to the montmorillonite, slurries for heating films with different properties can be obtained. And blade coating to form a film, drying and annealing to obtain the high-temperature-resistant and high-resistance self-supporting graphene composite film.
According to the method, the montmorillonite is fully expanded in water and ultrasonic, and few-layer graphene can be intercalated between the montmorillonite layers. As shown in fig. 1, the montmorillonite layer serves as a connecting bridge between graphene sheets, and the formed slurry has good dispersibility. The interlayer distance of montmorillonite is not less than 0.96nm and is greater than the thickness of single-layer graphene by 0.335 nm. The composite film prepared from the conductive paste prepared by the method greatly reduces the conductivity of graphene and improves the resistance because the insulating montmorillonite blocks the graphene self-assembly. Montmorillonite belongs to inorganic aluminosilicate, has the characteristic of high-temperature stability and is more environment-friendly. Graphene paste itself is also an environmentally friendly and non-polluting material, and thus the conductive paste described herein is environmentally friendly and non-polluting. In addition, in the high-temperature heating film described herein, the connection of the graphene improves the flexibility of the self-supporting graphene composite film, and 180 ° bending can be achieved. So that the finally prepared high-temperature heating film has the advantages of high resistance, high temperature resistance and flexibility.
In one embodiment, the method for preparing the conductive paste for a graphene-containing high-temperature heating film described herein includes the following steps:
(1) dissolving a certain mass of expandable inorganic aluminosilicate in water under stirring, and ultrasonically stirring to obtain an expandable inorganic aluminosilicate solution or slurry for expansion and stripping;
(2) and mixing the graphene slurry with the expandable inorganic aluminosilicate solution or slurry, and dispersing the mixture by adopting a dispersion mode such as ultrasonic stirring, high-speed mechanical stirring, emulsification, sanding and the like or a combination of a plurality of dispersion modes in the dispersion modes to obtain the composite conductive slurry of graphene and expandable inorganic aluminosilicate.
In order to test the performance of the composite conductive paste, the obtained composite conductive paste is coated on a substrate (PET, non-woven fabric and copper foil) in a blade coating mode, dried at a certain temperature (80-100 ℃) and then annealed at the temperature of 350 ℃ and 450 ℃ in a muffle furnace to obtain the graphene composite expandable inorganic aluminosilicate heating film. The thickness of the obtained heating film is 10-200 um, the sheet resistance measured by a four-probe is 50-500 omega/sq, and the heating film is not broken after being bent for 500 times at 180 degrees.
In another preferred embodiment, the graphene slurry is sanded and then mixed with an expanded and exfoliated expandable inorganic aluminosilicate solution or slurry for dispersion. In a preferred embodiment, the graphene slurry may be sanded again for 0.5-2 h. Such as sanding for 0.5h, 1h, 1.5h, 2h, or a range or sub-range between any two of them.
In one embodiment, in step (1), the power of the ultrasonic agitation is 100-500W. For example, the power of the ultrasonic agitation may be 100W, 120W, 150W, 180W, 200W, 250W, 300W, 350W, 400W, 450W, 500W, or a range or sub-range between any two of them. In one embodiment, in step (1), the period of ultrasonic agitation is from 0.5 to 5 hours. For example, the period of ultrasonic agitation is 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h, 5h, or a range or subrange between any two of them.
In one embodiment, the swellable inorganic aluminosilicate is montmorillonite. Montmorillonite is a layered mineral composed of finely divided hydrous aluminosilicate, has a colloidal dispersion characteristic, and is usually produced as a mass or a soil-like aggregate. The montmorillonite can be seen as flaky crystal under an electron microscope, and the color is white gray, light blue or light red. When the temperature reaches 100-200 ℃, the montmorillonite gradually loses water. The dehydrated montmorillonite can also absorb water molecules or other polar molecules again. They can also swell and exceed several times their original volume when they absorb moisture. Most of domestic montmorillonite is calcium type montmorillonite. However, since it has a cation exchange structure, it can be modified with other cations such as sodium ion to obtain sodium type montmorillonite. In the present application, the montmorillonite is preferably sodium montmorillonite, mainly because sodium montmorillonite can continuously expand after absorbing water, and even can completely separate interlamination into a very thin single layer, thereby facilitating the intercalation of graphene into the interlamellar montmorillonite. And the interlayer spacing after the calcium type water absorption is increased to a certain value (2.14nm) and is not increased any more, so that the graphene is difficult to be accurately intercalated between the montmorillonite sheets, and the compounding of the graphene and the montmorillonite is not facilitated. In a preferred embodiment, the sodium montmorillonite is available from mitsubing technologies ltd, zhejiang, and has the product types: SD, high purity sodium montmorillonite.
In one embodiment, the graphene paste may have a solid content of 3% to 6% on a mass basis. For example, the solids content may be 3%, 4%, 5% or 6%. In a preferred embodiment, the graphene paste may be a graphene conductive paste provided by ningbo ink science and technology ltd: the thickness of the lamella is 1-3nm, and the diameter of the lamella is 1-10 um.
In a preferred embodiment, the mass ratio of graphene to montmorillonite may be 1: 2-1: 5.
in a second aspect, the present application also provides a graphene-containing conductive paste for a high temperature heating film prepared by the method as described above.
In a third aspect, the present application provides a high temperature heating film prepared by the conductive paste as described above.
The above-described preferred embodiments can be combined with each other to form new preferred embodiments of the present application, in keeping with the basic principles of the art.
The present application also aims to provide a graphene-containing conductive paste for an environmentally-friendly high-temperature heating film prepared by the preparation method.
Examples
The present application is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
In the following examples, the scanning electron microscope pictures were obtained by means of a scanning electron microscope of the type Phenom Pro. In the following examples, montmorillonite is provided by Zhejiang san Ding science and technology Co., Ltd, and the product model is: SD, high purity sodium montmorillonite. Graphene paste is provided by Ningbo ink science and technology, Inc.
Preparation examples
Example 1:
the embodiment relates to a graphene-containing conductive paste for a high-temperature heating film and a preparation method thereof.
(1) 1g of montmorillonite is dissolved in 20mL of deionized water under stirring, and the mixture is subjected to low-speed (500rpm) ultrasonic stirring for 1h under the ultrasonic power of 300W to obtain a montmorillonite solution.
(2) 10g of graphene slurry with the solid content of 5% is mixed with the montmorillonite solution, the mixture is continuously subjected to low-speed (500rpm) ultrasonic stirring for 0.5h under the ultrasonic power of 300W, and the composite conductive slurry of montmorillonite and graphene according to the example 1 is obtained after vacuum defoaming.
Example 2:
(1) 20g of montmorillonite is dissolved in 100mL of deionized water under stirring, and the mixture is ultrasonically stirred for 1h at a low speed (1000rpm) under the ultrasonic power of 300W to obtain montmorillonite slurry.
(2) 100g of graphene slurry with the solid content of 5% is mixed with the montmorillonite solution, sanding is carried out for 30min at 2000rpm of zirconium beads, and vacuum defoaming is carried out to obtain the composite conductive slurry of montmorillonite and graphene according to the embodiment 2.
Example 3:
(1) 45g of montmorillonite is dissolved in 200mL of deionized water under stirring, and the mixture is ultrasonically stirred for 1h at a low speed (1000rpm) under the ultrasonic power of 300W to obtain montmorillonite slurry.
(2) 300g of sanded graphene slurry with a solid content of 3% was mixed with the montmorillonite solution, then mechanically stirred at 3000rpm for 10min, then zirconium bead milled at 2000rpm for 30min, and finally vacuumed to remove bubbles to obtain the montmorillonite-graphene composite conductive slurry according to example 3.
Example 4:
(1) 45g of montmorillonite is dissolved in 200mL of deionized water under stirring, and the mixture is ultrasonically stirred for 1h at a low speed (1000rpm) under the ultrasonic power of 300W to obtain montmorillonite slurry.
(2) 300g of sanded graphene slurry with the solid content of 3% is mixed with the montmorillonite solution, then mechanically stirred at 3000rpm for 10min, then emulsified and dispersed at 6000rpm for 30min, and finally subjected to vacuum defoaming to obtain the montmorillonite and graphene composite conductive slurry according to example 4.
Comparative example 1:
(1) 100g of deionized water was added to 100g of graphene slurry having a solid content of 5%, and the mixture was ultrasonically stirred at a low speed (1000rpm) for 1 hour at an ultrasonic power of 300W to obtain graphene slurry according to comparative example 1.
(2) And (3) coating the slurry obtained in the step (1) on a substrate PET (polyethylene terephthalate) in a blade coating mode, drying in an oven at 80 ℃, and then annealing in a muffle furnace at 450 ℃ to obtain the graphene heating film according to the comparative example 1.
Comparative example 2:
(1) 36g of montmorillonite is dissolved in 200mL of deionized water under stirring, and the mixture is ultrasonically stirred for 1h at a low speed (1000rpm) under the ultrasonic power of 300W to obtain montmorillonite slurry.
(2) 200g of sanded graphene slurry with a solid content of 3% was mixed with the montmorillonite solution, then mechanically stirred at 3000rpm for 10min, then zirconium bead milled at 2000rpm for 30min, and finally vacuumed to remove bubbles to obtain the montmorillonite-graphene composite conductive slurry according to comparative example 2.
Examples of preparation of heating film
And (3) coating the slurry on different substrates (PET, non-woven fabrics and copper foils), drying at 80 ℃ and annealing at 450 ℃ to obtain the graphene (composite) heating film.
Referring to the attached drawings, fig. 2 and fig. 3, wherein fig. 2 is a scanning electron microscope picture of the surface of the graphene composite montmorillonite heating film of example 1, and fig. 3 is a scanning electron microscope picture of the cross section of the graphene composite montmorillonite heating film of example 1. As can be seen from fig. 2, the graphene with better conductivity (dark area) and the insulating montmorillonite (bright area) are relatively uniformly distributed on the surface of the heating film, which indicates that the graphene and the insulating montmorillonite are better dispersed in a composite manner, and some bright spots on the surface are mainly some montmorillonite particles which are not completely expanded and peeled. As can be seen from the sectional electron microscope image in FIG. 3, the heating film prepared from the composite slurry has good directionality, and the lamellar structure of the heating film and the heating film is kept, so that the heating film is beneficial to heating and heat conduction.
Slurry parameters and test results of examples and comparative examples are shown in table 1 below.
Table 1 conductive paste parameters and test results of heating films of examples 1 to 4 and comparative examples 1 to 2
As can be seen from the results of table 1, the high temperature heating film prepared from the conductive paste described herein has advantages of high resistance, high temperature resistance and flexibility, compared to the conductive paste without montmorillonite. With the increase of the proportion of the montmorillonite, the sheet resistance of the graphene is gradually increased under the condition of equivalent thickness, and when the mass ratio of the graphene to the montmorillonite is 1: 6 hours, when the membrane is thick 40um, its sheet resistance is higher, and partly open circuit will no longer be applicable to the use of high temperature heating membrane this moment.
Heating film stability test
The graphene heating films obtained in the examples and comparative examples were cut into a size (mm) of 300 × 30x film thickness, fabricated into a heating film test structure as shown in fig. 4, and then subjected to a voltage test (power supply of a DC regulated power supply: output: DC 0-220V 0-10A) applied to copper wires 500 on both sides. And (3) carrying out multipoint temperature measurement by using a thermocouple, keeping the temperature of the heating film at about 400 ℃ by regulating and controlling the voltage, operating for 6 hours, and measuring the temperature difference to be +/-10 ℃ by using the thermocouple. After 3 repetitions, the sheet resistance of the heated film was measured again (Table 1). As can be seen from the data in table 1, the sheet resistance in the examples is slightly decreased after 3 times of operation, and the decrease range is below 5%, which indicates that the graphene heating film has better stability. In the comparative example, when montmorillonite was not added, the temperature of the heating film could not reach 400 ℃ under the existing conditions because the sheet resistance of the heating film was small. When the proportion of montmorillonite is too high (m)Graphene:mMontmorillonite (montmorillonite)1: 6) when the heating film is too high in sheet resistance, the electric conduction is discontinuous, and heating cannot be achieved. Therefore, too small or too large proportion of the montmorillonite is not beneficial to the operation of the graphene heating film at high temperature, and needs to be in a proper proportion range.
The embodiments described above are intended to facilitate the understanding and appreciation of the application by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present application is not limited to the embodiments herein, and those skilled in the art who have the benefit of this disclosure will appreciate that many modifications and variations are possible within the scope of the present application without departing from the scope and spirit of the present application.
Claims (10)
1. The preparation method of the conductive paste containing graphene for the high-temperature heating film is characterized by comprising the following steps of:
s1: expanding expandable inorganic aluminosilicate in water to obtain an expanded inorganic aluminosilicate solution or slurry;
s2: and mixing and dispersing the graphene slurry and the expanded inorganic aluminosilicate solution or slurry obtained in the step S1 to obtain the conductive slurry containing graphene for the high-temperature heating film.
2. The method of claim 1, wherein swelling the swellable inorganic aluminosilicate in water in step S1 includes dissolving the swellable inorganic aluminosilicate in water and ultrasonically agitating for a first predetermined period of time.
3. The method as claimed in claim 2, wherein in step S1, the power of the ultrasonic agitation is 100- > 500W; the first predetermined period of time is 0.5-5 h.
4. The method of claim 1, wherein in step S2, the graphene slurry is sanded prior to mixing with the expanded inorganic aluminosilicate solution or slurry.
5. The method of claim 1, wherein the step S2 of mixing and dispersing the graphene slurry and the expanded inorganic aluminosilicate solution or slurry comprises mixing the graphene slurry and the expanded inorganic aluminosilicate solution or slurry, and then dispersing the resulting mixture by one or more of ultrasonic stirring, high speed mechanical stirring, emulsification and sanding.
6. The production method according to any one of claims 1 to 5, wherein in step S1, the swellable inorganic aluminosilicate is montmorillonite.
7. The production method according to any one of claims 1 to 5, wherein in step S2, the graphene slurry has a solid content of 3% to 6% on a mass basis.
8. The production method according to any one of claims 1 to 5, wherein in step S2, the mass ratio of the graphene to the expandable inorganic aluminosilicate is 1: 2-1: 5.
9. the conductive paste for a graphene-containing high-temperature heating film, which is prepared by the method for preparing the conductive paste for a graphene-containing high-temperature heating film according to any one of claims 1 to 8.
10. A high-temperature heating film prepared from the conductive paste for a graphene-containing high-temperature heating film according to claim 9.
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