CN113492562B - Processing technology for preparing water-based graphene electrothermal film by die cutting and laminating method - Google Patents

Processing technology for preparing water-based graphene electrothermal film by die cutting and laminating method Download PDF

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CN113492562B
CN113492562B CN202010197027.XA CN202010197027A CN113492562B CN 113492562 B CN113492562 B CN 113492562B CN 202010197027 A CN202010197027 A CN 202010197027A CN 113492562 B CN113492562 B CN 113492562B
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layer
water
graphene heating
based graphene
die cutting
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CN113492562A (en
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张骋
杜敏
汪苏能
曹博远
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Shanghai Kangtian New Energy Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
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    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2457/00—Electrical equipment

Abstract

The invention discloses a processing technology for preparing a water-based graphene electrothermal film by a die cutting and pasting method, and belongs to the technical field of processing technologies of water-based graphene electrothermal films. The processing technology ensures the precision and the uniformity of coating through the processes of continuous full-page coating, die cutting lamination, conductive tape layer coating and hot melt adhesive lamination, thereby ensuring the uniformity of heating and avoiding the uneven heating caused by the traditional silk screen printing or other modes; the adopted die cutting and laminating process can realize free adjustment of power, and the adjustment process is simple and convenient to operate; the prepared water-based graphene electrothermal film not only ensures the heating uniformity and the power adjustability, but also meets the power density and the heating temperature required by relevant building regulations in China.

Description

Processing technology for preparing water-based graphene electrothermal film by die cutting and laminating method
Technical Field
The invention relates to a processing technology of a graphene electrothermal film, in particular to a processing technology for preparing a water-based graphene electrothermal film by a die cutting and laminating method, and belongs to the technical field of processing technologies of water-based graphene electrothermal films.
Background
At present, most of electric heating films are common oily electric heating films, the electric heating films are prepared by compounding a high polymer material substrate and a carbon filler into electric heating slurry, and the electric heating slurry is coated on a carrier in an intermittent coating mode by the processes of screen printing, gravure printing and the like so as to meet the power requirement and the heating requirement of the electric heating films. Graphene has good characteristics of electric conductivity, heat conductivity, strength, toughness and the like, and is currently applied to electric heating films, particularly oily graphene electric heating films are taken as the main materials, and aqueous graphene slurry is adopted for fewer electric heating films.
The gravure printing technology used above is expensive in plate making cost, expensive in printing cost and complex in plate making process, and meanwhile, a film with a large thickness cannot be printed due to the process characteristics of gravure printing, so that the film forming process commonly used by the existing oily graphene electrothermal film is screen printing. When a circuit board, a thick film integrated circuit, a resistor and the like are printed by using a screen printing mode, the accurate ink layer thickness is the guarantee of providing reliable electrical parameters. Although the silk-screen printing has more influence factors on the thickness of the ink layer, including static factors such as silk screen extension, silk screen rebound, image and screen frame size, silk screen thickness and the like, and dynamic factors such as scraper hardness, scraping speed, scraping angle, ink viscosity, temperature and humidity and the like, the oil-based graphene electrothermal film is still more commonly used in the intermittent coating mode of the silk-screen printing at present because the electrothermal film coated in a full plate has higher power density and higher temperature, and if the power density is reduced, the temperature of the electrothermal film cannot meet the use requirement; meanwhile, the electrothermal film prepared by adopting a wire mesh coating mode has stable performance, the power density and the heating temperature of the electrothermal film accord with the requirements of relevant building regulations in China, and the comfort is good.
But at the same time, the electrothermal film coated on the full plate has a larger coating area, so the adhesive property between the electrothermal film and the second insulating protective layer is easy to be poorer, and the requirements of water resistance, electric leakage resistance and breakdown resistance cannot be completely met; in addition, when the aqueous graphene paste is used, due to the characteristics of the aqueous graphene paste, such as the problem of drying speed, and the characteristic of the two-dimensional planar structure of graphene, the aqueous graphene paste blocks meshes in the screen printing process, and cannot be completely applied to the common intermittent coating process such as screen printing, so that the fine production precision is achieved.
Therefore, the processing technology of the water-based graphene electrothermal film is suitable for the water-based graphene slurry, and can achieve the intermittent full-plate coating effect under the condition of continuous full-plate coating, and simultaneously meet the requirements of high precision, high heating uniformity, heating power adjustability, high adhesion with a protective layer and power density and heating temperature requirements of relevant building regulations in China.
Disclosure of Invention
In order to solve the technical problems, the invention provides a processing technology for preparing a water-based graphene electrothermal film by a die-cutting laminating method, which achieves an intermittent coating effect by die-cutting laminating after continuous full-plate coating and can obtain the water-based graphene electrothermal film with excellent performance.
The technical scheme of the invention is as follows:
the invention discloses a processing technology for preparing a water-based graphene electrothermal film by a die cutting and pasting method, which comprises the following preparation steps:
s1, coating aqueous graphene heating slurry on the front surface of a large carrier layer in an uninterrupted continuous full-page coating mode, and drying the coated slurry in a low-temperature drying mode to form an aqueous graphene heating slurry layer; coating a double-sided adhesive layer on the back of the carrier layer; cutting the coated carrier layer into a plurality of water-based graphene heating strips through a die cutting device;
s2: selecting a transparent heat-resistant plastic sheet with the width longer than the length of the water-based graphene heating strips as a lower insulation protective layer, and centrally attaching the plurality of water-based graphene heating strips obtained in the step S1 to the lower insulation protective layer at intervals along the width direction of the lower insulation protective layer by using a double-sided adhesive layer according to the length of the water-based graphene heating strips to form a water-based graphene heating layer;
s3: respectively attaching a conductive tape layer to two ends of all the water-based graphene heating strips in the structure formed in the step S2 so that all the water-based graphene heating strips are connected in parallel;
s4: selecting a transparent heat-resistant plastic sheet with the same width as the lower insulation protective layer as an upper insulation protective layer, and coating a hot-melt insulation adhesive layer on one surface of the upper insulation protective layer;
s5: and (5) carrying out hot-pressing lamination on the upper-layer insulation protection layer coated in the step (S4) towards the water-based graphene heating body layer in the structure formed in the step (S3) by using a hot-melt insulation adhesive layer to form the water-based graphene electric heating film.
The further technical scheme is as follows:
the continuous full-plate coating mode in the step S1 is one of a scraper type continuous full-plate coating mode and a slit type continuous full-plate coating mode; and the low-temperature drying mode in the step S1 is to adopt a stepped drying oven for drying at 70-90 ℃.
The further technical scheme is as follows:
in the step S1, the carrier layer is a transparent PET film layer, and the thickness of the carrier layer is 80-120 microns; the thickness of the aqueous graphene heating slurry layer is 25-35 microns.
The further technical scheme is as follows:
the upper insulating protective layer is a PET film layer, and the thickness of the upper insulating protective layer is 75-80 microns; the lower insulating protective layer is one of a PET film layer and a PI film layer, and the thickness of the lower insulating protective layer is 90-100 microns.
The further technical scheme is as follows:
the double-sided adhesive layer is a conventional double-sided insulating adhesive layer, and the thickness of the double-sided adhesive layer is 30-50 microns; the hot-melt insulating adhesive glue in the hot-melt insulating adhesive glue layer is ethylene-vinyl acetate copolymer, and the thickness of the hot-melt insulating adhesive glue layer is 30-80 microns.
The further technical scheme is as follows:
and S2, forming a blank space between two adjacent aqueous graphene heating strips, wherein the width ratio of the aqueous graphene heating strips to the blank space is 1 (0.2-1.0).
The further technical scheme is as follows:
the conductive tape layer in the step S3 comprises a high-conductivity and heat-conduction adhesive tape and a conductive metal tape, and the step S3 comprises the following steps:
s3a, respectively pasting a high-electric-conduction heat-conduction adhesive tape on two ends of all the water-based graphene heating strips in the structure formed in the step S2, wherein one part of each of the two high-electric-conduction heat-conduction adhesive tapes covers all the water-based graphene heating strips;
and S3b, attaching the conductive metal strips with the same width on the upper surface of the high-conductivity and heat-conduction adhesive tape, wherein the end parts of the conductive metal strips in the length direction are longer than the high-conductivity and heat-conduction adhesive tape.
The further technical scheme is as follows:
the conductive metal belt is a conductive copper foil belt.
The further technical scheme is as follows:
and the hot-pressing and laminating temperature in the step S5 is 110-130 ℃.
The invention also discloses the water-based graphene electrothermal film prepared by the processing technology.
The beneficial technical effects of the invention are as follows:
1. the processing technology ensures the precision and the uniformity of coating through the processes of continuous full-page coating, die cutting lamination, conductive tape layer coating and hot melt adhesive lamination, thereby ensuring the uniformity of heating and avoiding the uneven heating caused by the traditional silk screen printing or other modes;
2. the processing technology avoids the problem that the aqueous graphene heating slurry cannot be completely suitable for common intermittent coating such as screen printing and the like, adopts a scraper type and slit type continuous coating method to prepare continuous full-plate coating and then assemble the full-plate coating in a die cutting and laminating mode, absorbs the advantages of intermittent coating and achieves the effect of intermittent coating;
3. the die cutting and attaching mode adopted by the processing technology can realize free adjustment of heating power, the adjustment technology is simple and convenient to operate, and the power can be freely adjusted within the range of 160-240W;
4. the processing technology adopts the high-electric-conductivity heat-conducting adhesive tape to replace the traditional heat-conducting silver paste to reduce the contact resistance between the copper bar and the heating layer, and has the characteristics of low price, simple composite technology, high electric conductivity and excellent aging resistance;
5. the prepared water-based graphene electrothermal film has high production precision and high heating uniformity, can realize free adjustment of power through die cutting and bonding, and simultaneously meets the power density and heating temperature required by relevant building regulations in China.
Drawings
Fig. 1 is a schematic front-side top-view structural diagram of an aqueous graphene electrothermal film in the present invention;
FIG. 2 isbase:Sub>A schematic longitudinal sectional view of section A-A of FIG. 1;
FIG. 3 is a schematic longitudinal sectional view of section B-B of FIG. 1;
wherein:
100-upper insulating protective layer;
200-a conductive tape layer; 201-high electric and heat conducting adhesive tape; 202-a conductive metal layer;
300-an aqueous graphene heating layer; 301-aqueous graphene heating strips; 301 a-a carrier layer; 301 b-a water-based graphene heating slurry layer; 302-blank spacing;
400-lower insulating protective layer;
500-double-sided adhesive layer;
600-hot-melt insulating adhesive glue layer.
Detailed Description
In order to make the technical means of the present invention clearer and to make the technical means of the present invention capable of being implemented according to the content of the specification, the following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples, which are provided for illustrating the present invention and are not intended to limit the scope of the present invention.
The following specific embodiment describes a processing technology for preparing the aqueous graphene electrothermal film by the die cutting and laminating method in detail. The processing technology mainly comprises the following preparation steps:
s1, coating aqueous graphene heating slurry on the front surface of a large carrier layer 301a in an uninterrupted continuous full-page coating mode (one of a scraper type continuous full-page coating mode and a slit type continuous full-page coating mode, preferably the scraper type continuous full-page coating mode), and drying the coated slurry in a low-temperature drying mode (drying in a stepped drying oven at 70-90 ℃) to form an aqueous graphene heating slurry layer 301b; coating a double-sided adhesive layer 500 on the back of the carrier layer; cutting the coated carrier layer into a plurality of water-based graphene heating strips 301 through a die cutting device;
s2: selecting a transparent heat-resistant plastic sheet with the width longer than the length of the water-based graphene heating strips as a lower insulation protection layer 400, and attaching the plurality of water-based graphene heating strips obtained in the step S1 to the blank lower insulation protection layer at intervals in the width direction of the lower insulation protection layer by using a double-sided adhesive layer according to the length of the water-based graphene heating strips to form a water-based graphene heating layer 300; a blank space 302 is formed between two adjacent aqueous graphene heating strips, and the width ratio of the aqueous graphene heating strips to the blank space is 1 (0.2-1.0);
s3: respectively attaching a conductive tape layer 200 to two ends of all the water-based graphene heating strips in the structure formed in the step S2 so that all the water-based graphene heating strips are connected in parallel; the above-mentioned conductive tape layer 200 comprises a highly conductive and thermally conductive adhesive tape 201 and a conductive metal tape 202, wherein the conductive metal tape is preferably a conductive copper foil tape, and the step S3 more specifically comprises the following steps:
s3a, respectively pasting a high-electric-conduction heat-conduction adhesive tape on two ends of all the water-based graphene heating strips in the structure formed in the step S2, wherein one part of each of the two high-electric-conduction heat-conduction adhesive tapes covers all the water-based graphene heating strips;
s3b, attaching the conductive metal strips with the same width on the upper surface of the high-conductivity and heat-conduction adhesive tape, wherein the end parts of the conductive metal strips in the length direction are longer than the high-conductivity and heat-conduction adhesive tape;
s4: selecting a transparent heat-resistant plastic sheet with the same width as that of the lower insulating protective layer as the upper insulating protective layer 100, and coating a hot-melt insulating adhesive layer 600 on one surface of the upper insulating protective layer;
s5: and (3) carrying out hot-pressing lamination on the upper insulating protective layer coated in the step (S4) towards the water-based graphene heating body layer in the structure formed in the step (S3) by using a hot-melt insulating adhesive layer, wherein the hot-pressing lamination temperature is 110-130 ℃, and thus forming the water-based graphene electrothermal film.
In the above processing technology, the upper insulating protection layer 100 is a PET film layer, in this embodiment, a transparent PET film layer is preferred, and the thickness of the upper insulating protection layer is 75 to 80 micrometers, in this embodiment, 75 micrometers is preferred. The lower insulating protective layer 400 is one of a PET film layer and a PI film layer, preferably a transparent PET film layer, and has a thickness of 90 to 100 micrometers, preferably 100 micrometers.
In the processing technology, the double-sided adhesive layer is a conventional double-sided insulating adhesive layer, and the thickness of the double-sided adhesive layer is 30-50 microns; the hot-melt insulating adhesive used in the hot-melt insulating adhesive layer is ethylene-vinyl acetate copolymer which can be hot-pressed and jointed with other parts under the condition of hot pressing at 110-130 ℃, and the thickness of the hot-melt insulating adhesive layer is 30-80 microns, preferably 75 microns. The total thickness of the upper insulating protective layer 100 and the hot-melt insulating adhesive layer in the above processing process is preferably not more than 150 μm.
In the above processing process, the carrier layer 301a is used for carrying the aqueous graphene heating paste, and is a transparent PET film layer, and the thickness of the carrier layer is 80-120 micrometers, preferably 100 micrometers. The aqueous graphene heating slurry layer 301b is formed by coating an aqueous graphene heating slurry prepared by blending nano-graphene, a wetting dispersant, a defoaming agent, a thickening agent, an anti-settling agent, aqueous resin, water and the like on a carrier layer and drying the aqueous graphene heating slurry at a low temperature, and the thickness of the aqueous graphene heating slurry layer is 25-35 microns, preferably 30 microns.
In the above processing process, the lengths of the plurality of aqueous graphene heating strips may be set to be equal, or may be set to be stepped increasing or decreasing, and in this embodiment, it is preferable that all the aqueous graphene heating strips are set to be equal. In terms of the number of the water-based graphene heating strips, the number can be set according to the heating power of the heating film. In terms of arrangement, the plurality of aqueous graphene heating strips are arranged at intervals, wherein the width ratio of the aqueous graphene heating strips to the blank space is 1 (0.2-1), and in this specific embodiment, 1. The width of each aqueous graphene heating strip 301 is set to be 1-3cm, and may also be set according to the heating power required by the heating film, which may be set to be 1cm, 2cm or 3cm in the application, and is set to be 2cm in the present embodiment.
In the above processing process, the high electric and thermal conductive tape 201 may be a high electric and thermal conductive tape sold in the market at present, and the selection of the type and the like thereof is a technical scheme well known to those skilled in the art, and is not described in detail herein. The conductive metal tape 202 is preferably a conductive copper foil tape, and the end of the conductive metal tape in the length direction is longer than the highly conductive and heat conductive adhesive tape, so as to facilitate electrical connection with other external electrical components.
In this embodiment, in the above processing technology, the widths of the upper insulating and protecting layer 100 and the lower insulating and protecting layer 400 are both 31.5cm, and the lengths are not limited, and a coil may be used, and the length is determined according to actual conditions. The size of the cut water-based graphene heating strips 301 is 27cm long × 2cm wide, and when the water-based graphene heating strips are arranged, 2cm is arranged between two adjacent water-based graphene heating strips, that is, the width ratio between the water-based graphene heating strips and the blank space is 1. The distance between two opposite inner sides of the two high-electric-conductivity heat-conduction adhesive tapes is set to be 25cm, so that a part of each of the two high-electric-conductivity heat-conduction adhesive tapes covers all the water-based graphene heating strips, and all the water-based graphene heating strips are connected in parallel.
The following specific embodiment also describes an aqueous graphene electrothermal film prepared by the processing technology, and specific structures of the aqueous graphene electrothermal film are shown in fig. 1 to fig. 3. The water-based graphene electrothermal film comprises an upper insulation protective layer 100, a conductive belt layer 200, a water-based graphene heating body layer 300 and a lower insulation protective layer 400, wherein the conductive belt layer 200 and the water-based graphene heating body layer 300 are arranged between the lower insulation protective layer 400 and the upper insulation protective layer 100, and the lower insulation protective layer 400, the water-based graphene heating body layer 300 and the upper insulation protective layer 100 are sequentially stacked from bottom to top.
The upper insulating protective layer 100 is coated with a hot-melt insulating adhesive layer 600 on a side facing the aqueous graphene heat-generating body layer 300.
The aqueous graphene heating layer 300 comprises a plurality of aqueous graphene heating strips 301 which are arranged between a lower insulating protective layer and an upper insulating protective layer at intervals in parallel, a blank space 302 is formed between every two adjacent aqueous graphene heating strips 301, and the width ratio of the aqueous graphene heating strips to the blank space is 1 (0.2-1). Each of the aqueous graphene heating bars 301 includes a carrier layer 301a and an aqueous graphene heating paste layer 301b coated on the carrier layer, which are sequentially stacked from bottom to top. The carrier layer 301a of each aqueous graphene heating bar 301 facing the lower insulating protection layer 400 is coated with a double-sided adhesive layer 500.
The conductive tape layer 200 is arranged at the two side ends of the plurality of aqueous graphene heating strips to connect all the plurality of aqueous graphene heating strips in parallel, namely two conductive tape layers are arranged, wherein one conductive tape layer is arranged at one end of all the aqueous graphene heating strips and can cover one end of all the aqueous graphene heating strips; the other conductive belt layer is arranged at the other end of all the water-based graphene heating strips and can cover the other end of all the water-based graphene heating strips, so that all the water-based graphene heating strips are in a parallel connection state. Each conductive tape layer 200 comprises a highly conductive and heat conductive adhesive tape 201 positioned at the lower layer and a conductive metal tape 202 attached to the upper side surface of the highly conductive and heat conductive adhesive tape, the conductive metal tape is a conductive copper foil tape, the conductive copper foil tape is attached to the highly conductive and heat conductive adhesive tape, the width of the conductive copper foil tape is consistent with the width of the highly conductive and heat conductive adhesive tape, and the length of the conductive copper foil tape is longer than that of the highly conductive and heat conductive adhesive tape, so that the conductive copper foil tape is conveniently electrically connected with other external electrical components.
In the above-mentioned aqueous graphene electrothermal film, the broad width of upper insulating protective layer 100 and lower insulating protective layer 400 is 31.5cm, and length is not restricted, and optional coiled material confirms length according to actual conditions. The size of the cut water-based graphene heating strips 301 is 27cm long multiplied by 2cm wide, and when the water-based graphene heating strips are arranged, 2cm is arranged between every two adjacent water-based graphene heating strips, and in addition, the two end parts of all the water-based graphene heating strips are respectively left with 1.75cm white with the edges of the left side and the right side of the lower insulating protection layer. The distance between two opposite inner sides of the two high-electric-conductivity heat-conduction adhesive tapes is set to be 25cm, so that a part of each of the two high-electric-conductivity heat-conduction adhesive tapes covers all the water-based graphene heating strips, and all the water-based graphene heating strips are connected in parallel. The finally formed water-based graphene electrothermal film can be freely cut in length according to parameters such as heating power required by customers.
According to the processing technology, the precision and the uniformity of coating are ensured through the processes of continuous full-page coating, die cutting and laminating, conductive tape layer coating and hot melt adhesive laminating, so that the heating uniformity is ensured, and the non-uniform heating caused by the traditional silk screen printing or other modes is avoided; the method also avoids the problem that the water-based graphene heating slurry cannot be completely suitable for common intermittent coating such as screen printing and the like, adopts a scraper type and slit type continuous coating method to prepare continuous full-plate coating and then assemble the full-plate coating in a die cutting and laminating manner, absorbs the advantages of the intermittent coating and achieves the effect of the intermittent coating; the adopted die cutting and attaching mode can realize free adjustment of heating power, the adjustment process is simple and convenient to operate, and the power can be freely adjusted within the range of 160-240W; the high-electric-conductivity heat-conduction adhesive tape is used for replacing the traditional heat-conduction silver paste to reduce the contact resistance between the copper bar and the heating layer, and has the characteristics of low price, simple composite process, high electric conductivity and excellent aging resistance. The prepared water-based graphene electrothermal film has high production precision and high heating uniformity, can realize free adjustment of power through die cutting and laminating, and simultaneously meets the power density and heating temperature required by relevant building regulations in China.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A processing technology for preparing a water-based graphene electrothermal film by a die cutting and laminating method is characterized by comprising the following preparation steps:
s1, coating aqueous graphene heating slurry on the front surface of a large carrier layer (301 a) in an uninterrupted continuous full-page coating mode, and drying the coated slurry in a low-temperature drying mode to form an aqueous graphene heating slurry layer (301 b); coating a double-sided adhesive layer (500) on the back of the carrier layer; cutting the coated carrier layer into a plurality of water-based graphene heating strips (301) through a die cutting device;
s2: selecting a transparent heat-resistant plastic sheet with the width longer than the length of the water-based graphene heating strips as a lower insulation protection layer (400), and attaching the plurality of water-based graphene heating strips obtained in the step S1 to the lower insulation protection layer at intervals in the width direction of the lower insulation protection layer by a double-sided adhesive layer according to the length of the water-based graphene heating strips to form a water-based graphene heating layer (300);
s3: respectively attaching a conductive tape layer (200) to two ends of all the water-based graphene heating strips in the structure formed in the step S2 so as to connect all the water-based graphene heating strips in parallel;
s4: selecting a transparent heat-resistant plastic sheet with the same width as that of the lower insulating protective layer as an upper insulating protective layer (100), and coating a hot-melt insulating adhesive layer (600) on one surface of the upper insulating protective layer;
s5: hot-pressing and attaching the upper insulating protective layer coated in the step S4 towards the water-based graphene heating body layer in the structure formed in the step S3 by using a hot-melt insulating adhesive layer to form a water-based graphene electric heating film;
the continuous full-plate coating mode in the step S1 is one of a scraper type continuous full-plate coating mode and a slit type continuous full-plate coating mode; and the low-temperature drying mode in the step S1 is to adopt a stepped drying oven for drying at 70-90 ℃;
the conductive tape layer in the step S3 comprises a high-conductivity and heat-conduction adhesive tape (201) and a conductive metal tape (202), and the step S3 comprises the following steps:
s3a, respectively attaching a high-electric-conduction heat-conduction adhesive tape to two ends of all the water-based graphene heating strips in the structure formed in the step S2, wherein one part of each of the two high-electric-conduction heat-conduction adhesive tapes covers all the water-based graphene heating strips;
s3b, attaching the conductive metal strips with the same width on the upper surface of the high-conductivity and heat-conduction adhesive tape, wherein the end parts of the conductive metal strips in the length direction are longer than the high-conductivity and heat-conduction adhesive tape;
and (2) forming a blank space (302) between two adjacent aqueous graphene heating strips in the step S2, wherein the width ratio of the aqueous graphene heating strips to the blank space is 1 (0.2-1.0).
2. The processing technology for preparing the aqueous graphene electrothermal film by the die cutting and pasting method of claim 1 is characterized by comprising the following steps: in the step S1, the carrier layer (301 a) is a transparent PET film layer, and the thickness of the carrier layer is 80-120 microns; the thickness of the aqueous graphene heating slurry layer (301 b) is 25-35 microns.
3. The processing technology for preparing the aqueous graphene electrothermal film by the die cutting and pasting method according to claim 1 is characterized in that: the upper insulating protective layer (100) is a PET film layer, and the thickness of the upper insulating protective layer is 75-80 microns; the lower insulating protection layer (400) is one of a PET film layer and a PI film layer, and the thickness of the lower insulating protection layer is 90-100 micrometers.
4. The processing technology for preparing the aqueous graphene electrothermal film by the die cutting and pasting method according to claim 1 is characterized in that: the double-sided adhesive layer is a conventional double-sided insulating adhesive layer, and the thickness of the double-sided adhesive layer is 30-50 micrometers; the hot-melt insulating adhesive glue in the hot-melt insulating adhesive glue layer is ethylene-vinyl acetate copolymer, and the thickness of the hot-melt insulating adhesive glue layer is 30-80 microns.
5. The processing technology for preparing the aqueous graphene electrothermal film by the die cutting and laminating method according to claim 1 is characterized in that: the conductive metal strip (202) is a conductive copper foil strip.
6. The processing technology for preparing the aqueous graphene electrothermal film by the die cutting and laminating method according to claim 1 is characterized in that: and the temperature of hot pressing and attaching in the step S5 is 110-130 ℃.
7. An aqueous graphene electrothermal film prepared by the processing technology of any one of the claims 1 to 6.
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