CN113099560B - Graphene heating diaphragm and preparation method thereof - Google Patents

Graphene heating diaphragm and preparation method thereof Download PDF

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Publication number
CN113099560B
CN113099560B CN202110381032.0A CN202110381032A CN113099560B CN 113099560 B CN113099560 B CN 113099560B CN 202110381032 A CN202110381032 A CN 202110381032A CN 113099560 B CN113099560 B CN 113099560B
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electrode
positive
negative
insulating substrate
film
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CN113099560A (en
Inventor
储招李
潘卓成
潘智军
谭化兵
李磊
杨石山
王宁
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Anhui Aerospace and PMA Health Technology Co Ltd
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Anhui Aerospace and PMA Health Technology Co Ltd
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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
    • H05B3/02—Details
    • 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
    • H05B3/02—Details
    • H05B3/03—Electrodes
    • 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
    • H05B3/145—Carbon only, e.g. carbon black, graphite
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

The invention provides a graphene heating membrane, which comprises an insulating substrate, electrodes and a graphene heat conducting film, wherein the electrodes are arranged on the insulating substrate, the electrodes comprise a positive electrode circuit, a negative electrode circuit, a positive main electrode, a negative main electrode, a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes, the positive main electrode is connected with the positive auxiliary electrodes through the positive electrode circuit, the negative main electrode is connected with the negative auxiliary electrodes through the negative electrode circuit, a heating area is formed between the adjacent positive auxiliary electrodes and the negative auxiliary electrodes, the power density of each heating area is the same, and the graphene heat conducting film is not connected with the positive main electrode and the negative main electrode. The invention also provides a preparation method. The invention can realize uniform surface heating under the condition of special-shaped or/and avoidance areas.

Description

Graphene heating diaphragm and preparation method thereof
Technical Field
The invention belongs to the field of graphene heating, and particularly relates to a graphene heating membrane capable of realizing uniform surface heating under the condition of abnormal shape or/and avoidance area and a preparation method thereof.
Background
Graphene (Graphene), which is a planar film with hexagonal lattice formed by carbon atoms in sp2 hybridized orbits, is a two-dimensional nanomaterial with a thickness of only one carbon atom. Graphene is a two-dimensional crystal formed by closely stacking carbon atoms, and has the characteristics of magic electron transmission, electric conduction, heat conduction, machinery and the like. The physicists andersome and Kang Siding.nor Wo Xiao lov at the university of manchester in united kingdom in 2004 successfully exfoliated graphene from graphite in the laboratory, proving that graphene can be present alone, and thus enjoying the nobel physics prize in 2010.
Graphene is a new heat dissipation and conduction material developed in recent years, has extremely high heat conductivity (reaching 1500W/m.K and above) and excellent flexibility, and has been applied in a large scale. Based on the development of the industry, the membrane made of the graphene conductive film material can obtain the effect of large-area uniform heating, and release far infrared light waves with the wavelength range of 6-14 mu m, wherein the far infrared light waves in the wave band are called as 'life light waves', after the human body contacts and absorbs, cells in human tissues and the far infrared light waves resonate, and blood circulation can be realized, so that the activity of biomolecules such as nucleic acids, proteins and the like in the cells of the body can be effectively activated.
The existing graphene heating membrane can only realize surface heating or local heating of a regular shape, and can not realize uniform surface heating under the conditions of abnormal shape or/and avoidance areas.
Disclosure of Invention
Aiming at one or more of the problems in the prior art, the invention provides a graphene heating membrane, which comprises an insulating substrate, electrodes and a graphene heat conducting film, wherein the electrodes are arranged on the insulating substrate, each electrode comprises a positive electrode line, a negative electrode line, a positive main electrode, a negative main electrode, a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes, the positive main electrodes are connected with the positive auxiliary electrodes through the positive electrode lines, the negative main electrodes are connected with the negative auxiliary electrodes through the negative electrode lines, a heating area is formed between the adjacent positive auxiliary electrodes and the negative auxiliary electrodes, the power density of each heating area is the same, and the graphene heat conducting film is not connected with the positive main electrodes and the negative main electrodes.
Optionally, the positive electrode line and the negative electrode line are arranged along an outer contour of the insulating substrate such that a distance between the positive electrode line and the negative electrode line is maximized.
Optionally, the insulating substrate is a polyimide film, a thermoplastic polyester film or a TPU hot melt adhesive film.
Optionally, the positive electrode line and the negative electrode line are polyimide copper foil lines or silver paste/silver gel lines.
Optionally, the solar cell further comprises a heating body, wherein the heating body comprises a metal film and a heat conduction adhesion layer, optionally, the metal film is aluminum foil, and the heat conduction adhesion layer is heat conduction double faced adhesive tape.
Optionally, at least one avoidance area is arranged on the graphene heat conducting film.
Optionally, the electrode further includes a positive power line welding port and a negative power line welding port connected to the positive main electrode and the negative main electrode respectively, and a hollow area is formed on the insulating substrate, and the positive power line welding port and the negative power line welding port are hollow out.
Alternatively, a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes are arranged at intervals along the positive electrode line and the negative electrode line, respectively, forming an auxiliary electrode pair in the form of an interposed finger.
The invention also provides a preparation method of the graphene heating membrane, which comprises the following steps:
providing a patterned electrode on a surface of a rubberized insulating substrate, comprising: the method comprises the steps that a positive electrode circuit, a negative electrode circuit, a positive main electrode, a negative main electrode, a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes are arranged on a rubberized insulating substrate, the positive main electrode is connected with the positive auxiliary electrodes through the positive electrode circuit, the negative main electrode is connected with the negative auxiliary electrodes through the negative electrode circuit, and a heating area is formed between the adjacent positive auxiliary electrodes and the adjacent negative auxiliary electrodes;
patterning the graphene heat conducting film so that the graphene heat conducting film does not interface with the positive main electrode and the negative main electrode;
and compounding the patterned graphene heat conducting film and the patterned glue-coated insulating substrate.
Optionally, the step of disposing a patterned electrode on the surface of the rubberized insulating substrate further comprises:
the outer contour of the graphene heating membrane is arranged on the surface of the gluing insulating substrate;
positive and negative main electrode lines are provided along an outer contour of the insulating substrate such that a distance between the positive and negative main electrode lines is maximized.
Optionally, the step of disposing a patterned electrode on the surface of the rubberized insulating substrate further comprises:
and a positive electrode power line welding port and a negative electrode power line welding port are arranged on the surface of the rubberized insulating substrate.
Optionally, the preparation method further comprises:
cutting the protective film by taking the other glue-coated insulating substrate as the protective film, and hollowing out a positive electrode power line welding port and a negative electrode power line welding port of the patterned glue-coated insulating substrate;
and compounding the protective film and the patterned rubberized insulating substrate.
Optionally, the step of compounding the patterned graphene heat conducting film and the patterned rubberized insulating substrate includes:
and a hot press is used for 50-180 seconds at the temperature of 100-180 ℃, the pressure is 40-180kg/cm < 2 >, and silver paste/silver glue is used on the contact surfaces of the positive auxiliary electrode and the negative auxiliary electrode and the graphene heat conducting film, so that the silver paste is connected with the positive auxiliary electrode, the negative auxiliary electrode and the graphene heat conducting film to form good electric contact.
Optionally, the step of disposing a patterned electrode on the surface of the rubberized insulating substrate further comprises:
and locally reinforcing the surface, facing the graphene heat conducting film, of the welding port of the positive electrode power line and the welding port of the negative electrode power line by using a reinforcing plate.
Optionally, the method further comprises:
compounding the opposite surface of the graphene heat conducting film relative to the patterned gluing insulating substrate with one surface of the heat conducting adhesive layer;
the other surface of the heat conduction adhesive layer is compounded with the metal film.
Optionally, the step of disposing a patterned electrode on the surface of the rubberized insulating substrate includes:
and forming a patterned copper electrode on the glued PI copper-clad film by adopting an etching method, and removing redundant copper foil by sequentially carrying out the process steps of exposure, development, etching and film stripping to form the patterned glued insulating substrate.
Optionally, the step of disposing a patterned electrode on the surface of the rubberized insulating substrate includes:
and printing, drying and rolling the silver paste/silver paste and the intaglio or relief printing machine to form a silver paste/silver paste electrode which is uniformly and patternwise coated on the substrate film by the patterning printing plate surface to form a patterned rubberized insulating substrate.
According to the graphene heating membrane and the preparation method thereof, the positive main electrode, the negative main electrode, the positive auxiliary electrode and the negative auxiliary electrode are matched to form the electrode of the graphene heating membrane, so that uniform surface heating of the graphene heating membrane is realized under the conditions of abnormal shape or/and avoidance areas, limitation is reduced, practicability is increased, and the graphene heating membrane can be widely used in the fields of graphene membrane heating and physiotherapy (irregular heating surfaces such as avoidance of heating products, design of heating areas of products, support holes and the like are needed), such as toilet seats, opposite heating tables, heating gloves and the like, and the product performance of uniform and rapid heating can be realized.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of one embodiment of a graphene heat-generating membrane according to the present invention;
fig. 2 is a schematic diagram of the structure of each layer of the graphene heating membrane;
fig. 3 is a schematic diagram of a graphene heat-generating membrane that does not include auxiliary electrodes.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
As shown in fig. 1 and 2, the graphene heat-generating membrane includes:
an insulating substrate 1;
the electrodes 2 are arranged on the insulating substrate 1 and comprise positive electrode lines 21, negative electrode lines 22, positive main electrodes 23, negative main electrodes 24, a plurality of positive auxiliary electrodes 25 and a plurality of negative auxiliary electrodes 26, the positive auxiliary electrodes and the negative auxiliary electrodes are arranged at intervals around the avoidance areas to form structure distribution in a finger-inserting mode, heating areas 27 are formed between adjacent positive auxiliary electrodes and negative auxiliary electrodes, and the power density of each heating area is the same (the power density is the same or the difference value of the power densities is in a set range);
the graphene heat conducting film 3 is not connected with the positive main electrode and the negative main electrode and is connected with the positive auxiliary electrode and the negative auxiliary electrode through silver paste/silver glue, and at least one avoidance area 31 is arranged on the graphene heat conducting film;
the heating element 4 includes a metal film 41 and a heat conductive adhesive layer 42, and optionally, includes two heat conductive adhesive layers and a metal film sandwiched between the two heat conductive adhesive layers.
In one embodiment, an electrode is formed on one insulating substrate by patterning, and the other insulating substrate is compounded with the one insulating substrate as a protective film.
In one embodiment, the electrode further includes a positive power line weld port 28 and a negative power line weld port 29.
In one embodiment, the preparation method of the graphene heating membrane comprises the following steps:
a patterned copper electrode is arranged on the surface of Polyimide (PI) of the rubberized insulating substrate;
patterning the graphene heat conducting film by using a laser cutting machine or a cutting machine;
cutting the Polyimide (PI) protective film 10 by using a laser cutting machine or a cutting machine and hollowing out an electrode power line welding port;
compounding a heating body formed by cutting a Polyimide (PI) protective film from top to bottom with the formed gluing PI containing the patterned copper electrode, so that an insert-finger type positive auxiliary electrode, a negative auxiliary electrode, a positive main electrode, a negative main electrode and a graphene heat conducting film do not have overlapping areas (the graphene heat conducting film is 2-5mm away from the positive main electrode and the negative main electrode, preferably 2 mm), and exposing the positive main electrode, the negative main electrode, a positive power line welding port and a negative power line welding port;
silver paste/silver glue is used on the contact surfaces of the positive auxiliary electrode, the negative auxiliary electrode and the graphene heat conducting film, and the silver paste is connected with the positive main electrode, the negative main electrode and the graphene heat conducting film to form good electric contact;
the hollowed-out parts reserved by the Polyimide (PI) protective film are aligned with the welding ports of the positive power line and the negative power line;
polyimide (PI) is used for local reinforcement on the reverse sides of the welding ports of the positive power line and the negative power line, and insulating glue is arranged in the welding port areas of the positive power line and the negative power line for sealing, so that oxidation of the wiring terminal and reliability reduction are prevented;
a layer of heat-conducting double-sided adhesive tape (heat-conducting adhesive layer) is compounded on one side of the formed graphene heat-conducting film, so that the graphene heat-conducting film is convenient to be in seamless fit with a product, and the heat transfer efficiency is improved (the thickness of the adhesive is 0.05-0.5mm, preferably 0.1 mm);
surface-frosted aluminum foil or alloy metal thereof (metal film, thickness of 0.02-0.5mm, preferably 0.15 mm) cut by patterning according to a desired heating surface using a laser cutter or a cutter;
and compounding the patterned aluminum foil or alloy metal thereof with the heat-conducting double faced adhesive tape, wherein the aluminum foil can improve the uniformity of the graphene heating membrane.
The method for setting the patterned electrode comprises the following steps:
the method comprises the steps of designing one maximized positive and negative main electrodes on each side of the special-shaped opposite sides, and designing electrode power line welding ports on two ends of each electrode, optionally, determining the widths and the thicknesses of the positive main electrode and the negative main electrode according to the load/current carrying and pressure drop requirements of a product (such as a toilet seat), wherein the greater the load/current carrying is, the greater the pressure drop is, the greater the width is, the greater the thickness is, and the greater the load/current carrying is, the greater the widths and the thickness of the positive main electrode, the negative main electrode, the positive auxiliary electrode and the negative auxiliary electrode are; the longer the lengths of the positive main electrode, the negative main electrode, the positive auxiliary electrode and the negative auxiliary electrode are, the larger the voltage drop is, and the widths and the thicknesses of the positive main electrode, the negative main electrode, the positive auxiliary electrode and the negative auxiliary electrode are required to be increased for reducing the voltage drop;
a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes are mutually inserted between the positive main electrode and the negative main electrode, the adjacent positive auxiliary electrodes, the adjacent negative auxiliary electrodes and the hollowed-out parts are not overlapped, the hollowed-out parts and the supporting areas are not overlapped, and the auxiliary electrodes are not intersected with the main electrodes (the distance between the auxiliary electrodes and the main electrodes is 1-5mm, preferably 2 mm);
according to the voltage, temperature, graphene heat conducting films and avoidance areas which are required by the technology, the resistance of the corresponding graphene heat conducting films can meet the heating temperature and the power density consistency between each positive auxiliary electrode and each negative auxiliary electrode (the positive auxiliary electrode and the adjacent negative auxiliary electrode form an interdigital electrode, the power density of the heating areas of the interdigital electrodes is the same, and the avoidance areas need to be subtracted from the heating areas).
The method for compounding the graphene heat-conducting film and the patterned electrode by using the gummed insulating substrate Polyimide (PI) comprises the following steps:
the prepressing machine is used at 100-180 ℃ for 50-180 seconds, and the pressure is 40-180kg/cm < 2 >. (preferably, the pressing temperature is 120 ℃, the pressing time is 15 seconds, and the pressure is 60kg/cm < 2 >). Before lamination, the graphene heat-conducting film is required to be aligned with the patterned electrode according to design requirements, so that the graphene heat-conducting film is not connected with the positive and negative main electrodes.
The method for compounding the patterned aluminum foil or alloy metal thereof with the heat-conducting double faced adhesive tape comprises the following steps: using a hot press at 100-180 degrees centigrade for 50-180 seconds, with a pressure of 40-180kg/cm2, preferably: the pressing temperature is 160 ℃, the pressing time is 90s, and the pressure is 120kg/cm < 2 >. Compounding aluminum foil or alloy metal thereof with heat-conducting double faced adhesive tape, namely using a hot press or a preformer at 80-130 ℃ for 15-30 seconds, wherein the pressure is 40-180kg/cm < 2 >, and the preferable method is as follows: the pressing temperature is 100 ℃, the pressing time is 15s, and the pressure is 50kg/cm < 2 >.
In one embodiment, a Polyimide (PI) surface patterned electrode preparation method includes:
carrying out the process steps of exposing, developing, etching and film stripping on a copper electrode circuit formed with a pattern by adopting an etching method on a copper-clad film (namely, a layer of glue is contained between a copper-clad film insulating PI substrate and a copper foil), and finally cleaning the redundant copper foil; the thickness of the copper foil is 15-40 micrometers, and the width of the copper foil is 2-10mm.
By adopting a silver paste/silver paste connection method to connect the graphene heat conducting film and the copper electrode circuit, the contact resistance can be effectively reduced, local hot spots can be reduced, and the safety coefficient can be increased.
In another embodiment, a Polyimide (PI) surface patterned electrode preparation method includes:
and (3) preparing proper silver paste/silver paste and a gravure or letterpress printing machine by the patterned printing layout, printing, drying and rolling to form a silver paste/silver paste electrode which is uniformly patterned and coated on a substrate film, wherein PI and PET can be used as the substrate film.
The silver paste/silver paste and the intaglio or relief printing machine are used for manufacturing the circuit, electrodes do not need to be etched, the production is quicker, the process is more environment-friendly, and the cost is lower.
In a specific embodiment, taking a graphene heating membrane of a toilet seat as an example:
example 1
The preparation method of the graphene heating membrane comprises the following steps:
forming a patterned copper electrode on the surface of Polyimide (PI) of a rubberized insulating substrate by using an etching method, and sequentially carrying out the process steps of exposure, development, etching and film stripping to obtain the patterned copper electrode, wherein the copper electrode comprises a positive electrode line, a negative electrode line, a positive main electrode and a negative main electrode, a plurality of positive auxiliary electrodes and negative auxiliary electrodes are respectively arranged on the positive electrode line and the negative electrode line, the intervals between the auxiliary electrodes and the main electrodes are 2mm (are not intersected), and the power densities of six heating areas obtained among the auxiliary electrodes are consistent; the positive main electrode and the negative main electrode are also respectively provided with ports for power input, namely a positive power line welding port and a negative power line welding port;
uniformly coating silver paste/silver glue on a place where an electrode is required to be contacted with the graphene heat conducting film by using a glue dispenser so as to reduce contact resistance and reduce heating hot spots;
cutting the Polyimide (PI) protective film by using a laser cutting machine or a film cutting machine, and aligning the hollowed-out parts which are reserved by using the laser cutting machine or the cutting machine to a port for inputting a power supply;
cutting a reinforcing plate (polyimide) by using a laser cutting machine and attaching the reinforcing plate (polyimide) to the back surfaces of a welding port of a positive power line and a welding end of a negative power line (the back side of a patterned copper foil) so as to improve the strength of the reinforcing plate and facilitate welding of a power line;
patterning the graphene heat conduction film by using a laser cutting machine or a film cutting machine, wherein the obtained graphene heat conduction film is smaller than the interdigital electrode, and the distances among a heating area (avoiding area), a positive main electrode and a negative main electrode are 2-5mm;
pre-pressing and hot-pressing the protective film, the patterned graphene heat-conducting film and the patterned electrode to ensure that no overlapping area exists among the interdigital electrode, the positive main electrode, the negative main electrode and the graphene heat-conducting film (the distance between the graphene heat-conducting film and the positive main electrode and the negative main electrode is 2-5mm, preferably 2 mm), and the welding port of the main electrode and the power line is exposed to form a graphene heating membrane; wherein the pre-pressing and pressing temperature is 120 ℃, the pressing time is 15 seconds, the pressure is 60kg/cm < 2 >, the hot pressing and pressing temperature is 160 ℃, the pressing time is 90 seconds, and the pressure is 120kg/cm < 2 >;
welding a power lead, a normally closed temperature limiter, a temperature adjusting button and a temperature sensor on a graphene heating membrane wiring terminal, and arranging insulating glue in a welding area to seal so as to prevent the wiring terminal from oxidizing and the two-pole crossing sparking phenomenon and increase the safety of the wiring terminal;
and compounding the graphene heating membrane, the heat-conducting double-sided adhesive tape with the thickness of 0.1mm, the aluminum foil with the thickness of 0.15mm subjected to surface frosting treatment, and the heat-conducting double-sided adhesive tape from top to bottom to form the graphene heating membrane with the uniform heating body.
Comparative example 1
As shown in fig. 3, the preparation method of the graphene heating membrane comprises the following steps:
forming a patterned copper electrode on the surface of Polyimide (PI) of a rubberized insulating substrate by using an etching method, and sequentially carrying out the process steps of exposure, development, etching and film stripping to obtain a patterned copper line, wherein the copper line is composed of a positive electrode main electrode and a negative electrode main electrode, and the positive electrode main electrode and the negative electrode main electrode are respectively provided with a port for inputting a power supply, a positive electrode power line welding port and a negative electrode power line welding end;
cutting the Polyimide (PI) protective film by using a laser cutting machine or a film cutting machine and aligning the hollowed-out parts which are left by the laser cutting machine or the film cutting machine to the power connection port of the main electrode;
cutting the reinforcing plate by using a laser cutting machine and attaching the reinforcing plate to a welding port of a positive electrode power line, and improving the strength of the reinforcing plate by using the back surface (the rear side of the patterned copper foil) of the welding port of the negative electrode power line so as to facilitate welding of a power wire;
patterning the graphene heat conducting film by using a laser cutting machine or a film cutting machine, wherein the graphene heat conducting film is contacted with the positive main electrode and the negative main electrode;
the protective film, the graphene heat conducting film and the patterned copper electrode are subjected to pre-pressing and hot pressing, and the welding port of the main electrode and the power line is exposed to form a graphene heating membrane; wherein the pre-pressing and pressing temperature is 120 ℃, the pressing time is 15 seconds, the pressure is 60kg/cm < 2 >, the hot pressing and pressing temperature is 160 ℃, the pressing time is 90 seconds, and the pressure is 120kg/cm < 2 >;
a power lead, a normally-closed temperature limiter, a temperature adjusting button and a temperature sensor are welded on the graphene heating membrane connecting terminal, insulating glue is arranged in a welding area to seal the welding area, so that the oxidation of the connecting terminal and the crossing sparking phenomenon of two poles are prevented, and the safety of the welding area is improved;
and compounding the graphene heating membrane and the heat conduction double-sided adhesive 3302 with the thickness of 0.1mm to form a heating body.
Taking a heating toilet diaphragm as an example, according to the temperature test method of the standard JGT 286-2010 low-temperature radiation electrothermal film 6.5.2 and the temperature non-uniformity test method of 6.6, the heating areas and the temperature difference data of the graphene heating diaphragm (shown in fig. 1) of the embodiment 1 and the graphene heating diaphragm (shown in fig. 3) of the comparative example 1 are shown in the following table 1, the heating areas and the areas of the graphene heat conducting films are measured, and the areas of the conventional shapes can be directly calculated by using an area calculation formula and the opposite drawing software.
TABLE 1
As can be seen from the table, the heating area of the heating membrane is larger and the uniformity is better than that of the traditional heating membrane under the conditions of opposite property or needing avoidance areas.
Example 2
The preparation method of the graphene heating membrane comprises the following steps:
the method comprises the steps that a proper silver paste/silver glue is prepared on the surface of a gummed insulating substrate Polyimide (PI), a silver paste/silver glue electrode which is uniformly coated on a substrate film in a patterning way is formed by printing, drying and rolling a patterning printing plate surface through a gravure or letterpress printing machine, an electrode circuit is composed of a positive main electrode and a negative main electrode, wherein a plurality of positive auxiliary electrodes and negative auxiliary electrodes are respectively arranged on the positive main electrode and the negative main electrode, the auxiliary electrodes are separated from the main electrodes by 2mm (are not intersected), and the power densities of six heating areas obtained among the auxiliary electrodes are consistent; the positive main electrode and the negative main electrode are respectively provided with a port for power input, namely a positive power line welding port and a negative power line welding end;
the copper electrode patch is attached to the welding port of the positive electrode power line and the welding end of the negative electrode power line;
cutting the Polyimide (PI) protective film by using a laser cutting machine or a film cutting machine and aligning the hollowed-out parts which are left by the laser cutting machine or the film cutting machine with the welding ports of the positive electrode power line and the welding ends of the negative electrode power line;
cutting the reinforcing plate by using a laser cutting machine or a film cutting machine, and attaching the reinforcing plate to a welding port of a positive electrode power line, wherein the back surface (the rear side of the patterned copper foil) of the welding end of the negative electrode power line is used for improving the strength of the welding end of the negative electrode power line so as to facilitate welding of a power wire;
patterning the graphene heat conducting film by using a laser cutting machine or a cutting machine, wherein the obtained graphene heat conducting film is smaller than the distance between a positive main electrode and a negative main electrode of an interdigital electrode heating area (avoiding area) by 2-5mm;
the protective film, the graphene heat-conducting film and the gluing insulating substrate polyimide of the patterned copper electrode are subjected to pre-pressing and hot-pressing, so that overlapping areas (the distance between the graphene heat-conducting film and the positive main electrode and the negative main electrode is 2-5mm, preferably 2 mm) do not exist among the interdigital electrode, the main electrode, the negative main electrode and the graphene heat-conducting film, and the welding ports of the main electrode and the power line are exposed to form a graphene heating film; wherein the pre-pressing and pressing temperature is 120 ℃, the pressing time is 15 seconds, the pressure is 60kg/cm < 2 >, the hot pressing and pressing temperature is 160 ℃, the pressing time is 90 seconds, and the pressure is 120kg/cm < 2 >;
the power supply lead, the normally-closed temperature limiter, the temperature adjusting button and the temperature sensor are welded on the formed graphene heating film binding post, insulating glue is arranged in a welding area to seal the binding post so as to prevent oxidation of the binding post and ignition phenomenon of crossing of two poles and increase safety of the binding post;
and compounding the graphene heating film, the heat-conducting double-sided adhesive tape with the thickness of 0.1mm, the aluminum foil with the thickness of 0.15mm subjected to surface frosting treatment, and the heat-conducting double-sided adhesive tape from top to bottom to form the graphene heating film sheet of the uniform heating body.
The heating areas and the temperature difference data of the graphene heating films of example 1, example 2 and comparative example 1 were measured according to the standard JGT 286-2010 low temperature radiation electrothermal film 6.5.2 temperature test method and the 6.6 temperature non-uniformity test method as shown in the following table 2:
TABLE 2
As can be seen from the table, the method for manufacturing the graphene heating membrane by using the silver paste/silver offset printing electrode has small temperature change relative to the etched copper electrode, and has larger heating area and better uniformity compared with the traditional heating membrane under the conditions of opposite property or needing an avoidance area. The method for manufacturing the silver paste/silver offset printing brush electrode is more environment-friendly than the method for etching the copper electrode.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. The graphene heating membrane comprises an insulating substrate, electrodes and a graphene heat conducting film, wherein the electrodes are arranged on the insulating substrate, and the graphene heating membrane is characterized by comprising a positive electrode circuit, a negative electrode circuit, a positive main electrode, a negative main electrode, a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes;
wherein the positive electrode line and the negative electrode line are arranged along the outer contour of the insulating substrate so that the distance between the positive electrode line and the negative electrode line is maximized;
the positive auxiliary electrodes and the negative auxiliary electrodes are respectively arranged at intervals along the positive electrode line and the negative electrode line;
the graphene heat conducting film is provided with at least one avoidance area, wherein the graphene heat conducting film is provided with at least one avoidance area, and a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes are arranged around the avoidance area at intervals.
2. The graphene heating membrane according to claim 1, wherein the insulating substrate is a polyimide film, a thermoplastic polyester film, or a TPU hot melt adhesive film; the positive electrode circuit and the negative electrode circuit are polyimide copper foil circuits or silver paste/silver glue circuits.
3. The graphene heat-generating membrane according to claim 1, further comprising: the heating element comprises a metal film and a heat conduction adhesive layer.
4. A graphene heating membrane according to claim 3, wherein the metal film is an aluminum foil, and the heat-conducting adhesive layer is a heat-conducting double-sided adhesive tape.
5. The graphene heating membrane according to claim 1, wherein the electrode further comprises a positive power line welding port and a negative power line welding port connected with the positive main electrode and the negative main electrode respectively, and the insulating substrate is provided with a hollowed-out area, and the positive power line welding port and the negative power line welding port are hollowed out.
6. The preparation method of the graphene heating membrane is characterized by comprising the following steps of:
providing a patterned electrode on a surface of a rubberized insulating substrate, comprising: the method comprises the steps that a positive electrode circuit, a negative electrode circuit, a positive main electrode, a negative main electrode, a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes are arranged on a rubberized insulating substrate, the positive main electrode is connected with the positive auxiliary electrodes through the positive electrode circuit, the negative main electrode is connected with the negative auxiliary electrodes through the negative electrode circuit, and a heating area is formed between the adjacent positive auxiliary electrodes and the adjacent negative auxiliary electrodes;
patterning the graphene heat conducting film so that the graphene heat conducting film is not connected with the positive main electrode and the negative main electrode, wherein at least one avoidance area is arranged on the graphene heat conducting film, and a plurality of positive auxiliary electrodes and a plurality of negative auxiliary electrodes are arranged at intervals around the avoidance area;
compounding the patterned graphene heat conducting film and the patterned glue-coated insulating substrate;
wherein, the step of disposing the patterned electrode on the surface of the rubberized insulating substrate further comprises:
the outer contour of the graphene heating membrane is arranged on the surface of the gluing insulating substrate;
positive and negative main electrode lines are provided along an outer contour of the insulating substrate such that a distance between the positive and negative main electrode lines is maximized.
7. The method for preparing a graphene heating film according to claim 6, wherein the step of disposing a patterned electrode on the surface of the rubberized insulating substrate further comprises:
setting a positive electrode power line welding port and a negative electrode power line welding port on the surface of the gluing insulating substrate;
wherein, the preparation method also comprises the following steps:
cutting the protective film by taking the other glue-coated insulating substrate as the protective film, and hollowing out a positive electrode power line welding port and a negative electrode power line welding port of the patterned glue-coated insulating substrate;
and compounding the protective film and the patterned rubberized insulating substrate.
8. The method of preparing a graphene heat-generating membrane according to claim 6, wherein the step of compounding the patterned graphene heat-conducting film and the patterned adhesive-coated insulating substrate comprises:
and a hot press is used for 50-180 seconds at the temperature of 100-180 ℃, the pressure is 40-180kg/cm < 2 >, and silver paste/silver glue is used on the contact surfaces of the positive auxiliary electrode and the negative auxiliary electrode and the graphene heat conducting film, so that the silver paste is connected with the positive auxiliary electrode, the negative auxiliary electrode and the graphene heat conducting film to form good electric contact.
9. The method for preparing a graphene heating film according to claim 6, wherein the step of disposing a patterned electrode line on the surface of the rubberized insulating substrate further comprises:
and locally reinforcing the surface, facing the graphene heat conducting film, of the welding port of the positive electrode power line and the welding port of the negative electrode power line by using a reinforcing plate.
10. The method for preparing a graphene heating membrane according to claim 6, further comprising:
compounding the opposite surface of the graphene heat conducting film relative to the patterned gluing insulating substrate with one surface of the heat conducting adhesive layer;
the other surface of the heat conduction adhesive layer is compounded with the metal film.
11. The method for preparing a graphene heating film according to claim 6, wherein the step of disposing a patterned electrode line on the surface of the rubberized insulating substrate comprises:
and forming a patterned electrode on the glued PI copper-clad film by adopting an etching method, and removing redundant copper foil through the process steps of exposure, development, etching and film stripping in sequence to form the patterned glued insulating substrate.
12. The method for preparing a graphene heating film according to claim 6, wherein the step of disposing a patterned electrode line on the surface of the rubberized insulating substrate comprises:
and printing, drying and rolling the silver paste/silver paste and the intaglio or relief printing machine to form a silver paste/silver paste electrode which is uniformly and patternwise coated on the substrate film by the patterning printing plate surface to form a patterned rubberized insulating substrate.
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