CN111065176A - Waterproof graphene heating sheet and preparation method thereof - Google Patents
Waterproof graphene heating sheet and preparation method thereof Download PDFInfo
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- CN111065176A CN111065176A CN202010027126.3A CN202010027126A CN111065176A CN 111065176 A CN111065176 A CN 111065176A CN 202010027126 A CN202010027126 A CN 202010027126A CN 111065176 A CN111065176 A CN 111065176A
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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
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating 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—Heating 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
- H05B3/02—Details
- H05B3/04—Waterproof or air-tight seals for heaters
-
- 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
-
- 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
- H05B3/36—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heating conductor embedded in insulating material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
- H05B2203/006—Heaters using a particular layout for the resistive material or resistive elements using interdigitated 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/013—Heaters using resistive films or coatings
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
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Abstract
The heating sheet comprises an insulating carrier film, a silver paste coating printed on the carrier film, a waterproof coating printed on the carrier film, a graphene heating coating selectively printed on the carrier film or a laminating film and an insulating laminating film pressed on the carrier film. Waterproof coating covers silver paste coating's busbar, waterproof coating has the opening that generates heat, the positive negative electrode line of silver paste coating appears in, graphite alkene heating coating sees through the opening that generates heat and covers positive negative electrode line and the interval position between positive negative electrode line in succession, the extreme point department of eliminating positive negative electrode line produces the low resistance district because of short contact path and adjacent busbar, normal and even heating in the opening that generates heat has been ensured, can improve the lateral margin waterproof performance of graphite alkene heating plate, the installation margin of graphite alkene heating coating has also been increased.
Description
Technical Field
The invention relates to the technical field of graphene heating, in particular to a waterproof graphene heating sheet and a preparation method thereof.
Background
The thin film heating sheet which utilizes the graphene film layer to generate heat mechanically forms a heating bag which generates heat or/and chemically reacts with a warm bag, so that the thin film heating sheet is more suitable for human bodies and has the characteristic of environmental protection, the thin film heating sheet can be repeatedly used, the thin film heating sheet is easy to attach and use, the small film heating sheet can be conveniently carried or can be clamped in clothes. The existing heating sheet technology and products in the market generally have the quality problem that the human body is easily scalded in the use process of incapable uniform heating. One of the main reasons for analyzing the above is that the installation position deviation of the graphene film layer causes a low resistance region of the short circuit contact bus bar, and abnormal heating is easily generated in use of the product, so the installation margin of the graphene film layer is very small, the yield of the product is low, in the prior art, the installation method of the graphene film layer is to purchase the graphene film layer which is pre-formed into a solid film shape at an external import, the graphene film layer needs to have the thickness of a self-formed film and is attached to a PI substrate in a factory, the manufacturing cost is quite high, and the material is not independently controllable at present. Some attempt to directly print the heating film layer on the PI substrate in a coating manner, when the pattern is slightly careless in alignment, overflow and sticking of the graphene coating may contact the bus bar of the connection circuit, resulting in abnormal product quality. Therefore, there is a production problem that the mounting margin is too small, whether a solid-film-like graphene film layer is used or a liquid-coated graphene coating layer is used.
The technology that a graphene heating sheet is fixed by a graphene membrane assembly in a bonding mode is taught in Chinese patent publication No. CN110177402A, and discloses a graphene electric blanket, wherein the graphene electric blanket is characterized in that a bottom layer is an anti-slip layer, a surface layer is a decorative layer, the heating sheet is laid between the bottom layer and the surface layer, the heating sheet comprises an upper layer of insulating cloth and a lower layer of insulating cloth and a graphene heating sheet in a middle layer, the graphene heating sheets are distributed at intervals, copper leads are fixed on the left side and the right side of the graphene heating sheet, the graphene heating sheets are arranged at intervals, and the graphene heating sheets and the copper leads are bonded in the upper layer of insulating cloth and the lower layer of insulating cloth; the copper wire is used for connecting with a power line. The other traditional method is to coat graphene slurry on a soft base material and then add a copper electrifying conductive material to prepare the graphene-based conductive material.
Another teaching of an assembled graphene heater adopting a graphene membrane separation design is in chinese patent publication No. CN107396468A, which discloses a far infrared heating module, comprising: the graphene heating membrane comprises a first surface and a second surface; the front plate is arranged on the first surface and provided with a hollow part; the blank holder strip is arranged at the edge of the second surface; the graphene heating membrane is fixed by the front plate and the edge pressing strip; the graphene heating membrane comprises a single-layer or multi-layer graphene membrane and parallel strip-shaped electrodes arranged at two opposite edges of the graphene membrane, wherein the graphene membrane and the parallel strip-shaped electrodes are clamped between two insulating films.
Disclosure of Invention
The invention mainly aims to provide a waterproof graphene heating sheet, which can solve the problem of water soaking damage of the graphene heating sheet and also solve the problem of local overheating damage of a product caused by too small installation margin of a graphene film layer in the production process of the graphene heating sheet.
The invention mainly aims to provide a preparation method of a waterproof graphene heating sheet, which is used for preparing the waterproof graphene heating sheet under the condition of larger installation margin of a graphene film layer and avoiding abnormal heating of a low-resistance area of a product at the end points of a positive electrode wire and a negative electrode wire.
The main purpose of the invention is realized by the following technical scheme:
a waterproof graphene heating sheet is provided, including:
an insulating carrier film having a printing surface;
the silver paste coating is printed and formed on the printing surface of the insulating carrier film and comprises a positive electrode pattern and a negative electrode pattern which are not directly electrically connected with each other, the positive electrode pattern is integrally formed with a plurality of positive electrode wires and a first bus bar connected with the positive electrode wires, the negative electrode pattern is integrally formed with a plurality of negative electrode wires and a second bus bar connected with the negative electrode wires, the positive electrode wires and the negative electrode wires are arranged in an equidistant staggered mode, the positive electrode wires are provided with first end points facing the second bus bar, and the negative electrode wires are provided with second end points facing the first bus bar;
the waterproof coating is printed on the printing surface of the insulating carrier film, covers the first bus bar and the second bus bar, and is provided with a heating opening to expose the positive electrode wire and the negative electrode wire;
an insulating coating film attached to the printing surface of the insulating carrier film, and
the graphene heating coating is formed on the printing surface of the insulating carrier film or the binding surface of the insulating coating film in a selective printing mode, the graphene heating coating continuously covers the positive electrode wire, the negative electrode wire and the interval position between the positive electrode wire and the negative electrode wire through the heating opening, and the insulating coating covers the graphene heating coating and the rest positions of the waterproof coating outside the coverage area of the graphene heating coating.
By adopting the whole of the first basic technical scheme, the waterproof coating formed on the insulating carrier film by printing is utilized to enhance the side waterproof efficiency of the graphene heating sheet, meanwhile, the first bus bar and the second bus bar are insulated and protected, the graphene heating coating is prevented from accidentally contacting the first bus bar and the second bus bar, and by utilizing the heating opening of the waterproof coating, the graphene heating coating continuously covers the positive electrode wire, the negative electrode wire and the interval part between the positive electrode wire and the negative electrode wire through the heating opening, so that normal and uniform heating in the heating opening is ensured, the lateral edge waterproof performance of the graphene heating sheet can be improved, the installation margin of the graphene heating coating is increased, and the yield and the product durability of the graphene heating sheet can be increased.
The present invention in a preferred example may be further configured to: the width of the heating opening is slightly smaller than the gap between the first bus bar and the second bus bar, so that the waterproof coating substantially covers the first bus bar and the second bus bar and the first end point of the positive electrode wire and the second end point of the negative electrode wire are exposed in the heating opening.
By adopting the above preferred technical scheme, the heating opening of the waterproof coating is greatly limited in size, so that the end points of the positive electrode wire and the negative electrode wire are exposed from the heating opening of the waterproof coating, the contact length ratio of the graphene heating coating to the positive electrode wire and the negative electrode wire is increased, and the exposed surfaces of the first bus bar and the second bus bar are completely covered in an insulating manner, so that the first bus bar and the second bus bar are in good electrical contact.
The present invention in a preferred example may be further configured to: the width of the heating opening is slightly smaller than the unit extension length of the positive electrode wire and the negative electrode wire, so that the waterproof coating substantially covers the first bus bar, the second bus bar, the first end point of the positive electrode wire and the second end point of the negative electrode wire.
By adopting the preferable technical scheme, the terminal points of the positive electrode wire and the negative electrode wire are substantially covered by the waterproof coating layer by utilizing the smaller limitation of the size of the heating opening, the terminal points of the positive electrode wire and the negative electrode wire are fixed in the manufacturing process of the graphene heating sheet, and the terminal points of the positive electrode wire and the negative electrode wire can be more firmly prevented from offsetting or skewing.
The present invention in a preferred example may be further configured to: the coverage area of the graphene heating coating is larger than the opening size of the heating opening, or the graphene heating coating is positioned in the heating opening.
By adopting the preferable technical scheme, the covering area of the graphene heating coating is larger than the opening size of the heating opening, so that the graphene heating coating can be ensured to have larger installation margin to completely cover the heating opening, and a blank space lacking graphene heating coating materials is not formed in the heating opening, or the graphene heating coating is positioned in the heating opening, so that the thickness of the graphene heating sheet is further reduced.
The present invention in a preferred example may be further configured to: the width of the heating area, covered by the graphene heating coating, of the positive electrode wire and the negative electrode wire depends on the smaller of the unit extension length of the positive electrode wire and the negative electrode wire and the width of the heating opening, preferably, the line gap between the adjacent positive electrode wire and the negative electrode wire is 0.4-1.2 cm; preferably, the arrangement mode of the positive electrode wires and the negative electrode wires is linear or wavy and interval staggered; preferably, two side edges of the graphene heating coating are partially overlapped on the first bus bar and the second bus bar.
By adopting the above preferred technical scheme, the smaller of the unit extension length of the positive electrode wire and the negative electrode wire and the width of the heating opening is utilized to determine the width of the heating area of the positive electrode wire and the negative electrode wire covered by the graphene heating coating, and the graphene heating sheet with the defined heating area is redesigned according to the width change of the heating opening. Preferably, the heating of the low-voltage small-area module can be realized by using a line gap between the adjacent positive electrode line and the adjacent negative electrode line which is 0.4-1.2 cm. Preferably, the block resistance value of the graphene heating coating can be accurately defined by using the positive electrode wires and the negative electrode wires which are linear and staggered at intervals, or the bending-resistant fracture toughness of the positive electrode wires and the negative electrode wires can be improved by using the positive electrode wires and the negative electrode wires which are wavy and staggered at intervals. Preferably, the two side edges of the graphene heating coating are partially overlapped on the bus bar, and the alignment relation between the patterns of the graphene heating coating and the pattern of the silver paste coating can be conveniently observed through the bus bar exposed out of the rest metal surfaces of the graphene heating coating.
The present invention in a preferred example may be further configured to: the waterproof graphene heating sheet has a water washing resistance characteristic, the unit line width of the positive electrode line and the negative electrode line is smaller than the unit line width of the first bus bar and the second bus bar, and the waterproof graphene heating sheet has a kneading resistance characteristic and a circuit fracture prevention characteristic, and preferably, the composition of a silver paste material used for the silver paste coating comprises the following components in percentage by weight: 8-20% of spherical silver powder, and the particle size of the spherical silver powder is 2.5-6 mu m; 40-60% of flake silver powder with the particle size of 3-6 μm; 5-12% of nano silver powder, and the particle size of the nano silver powder is 18-60 nm; the organic carrier adopts 15-25% of vinyl resin, and the particle size of the vinyl resin is 0.9-1.5 mu m; 5-15% of a DBE solvent; 0.1 to 1% of an oxide additive, and an average particle diameter of 0.4 to 1.0 μm.
By adopting the preferable technical scheme, the waterproof graphene heating sheet has the characteristic of water washing resistance, so that the graphene heating sheet can be used as a lining interlayer of clothes. Preferably, with the specific composition of the silver paste material used for the silver paste coating, the positive and negative electrode wires formed by the silver paste coating and being thinner with respect to the bus bar are realized to have a flexible characteristic of flexing resistance and fracture resistance.
The present invention in a preferred example may be further configured to: the thickness of the polyester film of the insulating carrier film is 0.025-0.1 mm, more preferably 0.038-0.05 mm, the thickness of the polyester film of the insulating laminating film is smaller than that of the polyester film of the insulating carrier film, preferably 0.025-0.038 mm, the silver paste coating thickness of the silver paste coating is 4-12 mu m, the coating thickness of the graphene heating coating is 4-12 mu m, and the total film thickness of the graphene heating sheet is 0.08-0.4 mm.
By adopting the preferable technical scheme, the thickness range of each film layer is limited, and the thickness range comprises the thickness range of a specific polyester film, the brushing thickness range of a silver paste coating and a graphene heating coating and the total film thickness range of the graphene heating sheet, so that the graphene heating sheet has a sufficiently thin structure and is easier to attach to a human body or clamp in a clothes lining.
The main purpose of the invention is realized by the following technical scheme:
the preparation method of the waterproof graphene heating sheet comprises the following steps:
providing an insulating carrier film, wherein the insulating carrier film is provided with a printing surface;
printing a silver paste coating on the printing surface of the insulating carrier film, wherein the silver paste coating comprises a positive electrode pattern and a negative electrode pattern which are not directly electrically connected with each other, the positive electrode pattern is integrally formed with a plurality of positive electrode wires and a first bus bar connected with the positive electrode wires, the negative electrode pattern is integrally formed with a plurality of negative electrode wires and a second bus bar connected with the negative electrode wires, and the positive electrode wires and the negative electrode wires are arranged in an equidistant staggered manner;
printing a waterproof coating on the printing surface of the insulating carrier film, wherein the waterproof coating covers the first bus bar and the second bus bar and is provided with a heating opening to expose the positive electrode wire and the negative electrode wire;
printing on the printing surface of the insulating film or the binding surface of the insulating film to form a graphene heating coating, and
and adhering the insulating coating film to the printing surface of the insulating carrier film, wherein the graphene heating coating continuously covers the positive electrode wire, the negative electrode wire and the interval part between the positive electrode wire and the negative electrode wire through the heating opening, and the insulating coating film covers the graphene heating coating and the other parts of the waterproof coating outside the coverage area of the graphene heating coating.
By adopting the whole of the second basic technical scheme, the waterproof graphene heating sheet can be manufactured under the condition of a large installation margin of the graphene film layer, and abnormal heating of a low-resistance area generated at the end point of the positive electrode wire and the negative electrode wire of a product is avoided.
The present invention in a preferred example may be further configured to: the width of the heating opening is slightly smaller than the gap between the first bus bar and the second bus bar, so that the waterproof coating substantially covers the first bus bar and the second bus bar and the end points of the positive electrode wire and the negative electrode wire are exposed in the heating opening, or the width of the heating opening is slightly smaller than the unit extension length of the positive electrode wire and the negative electrode wire, so that the waterproof coating substantially covers the first bus bar, the second bus bar and the end points of the positive electrode wire and the negative electrode wire.
The present invention in a preferred example may be further configured to: the waterproof graphene heating sheet has a water washing resistance characteristic, the unit line width of the positive electrode line and the negative electrode line is smaller than the unit line width of the first bus bar and the second bus bar, and the waterproof graphene heating sheet has a kneading resistance characteristic and a circuit fracture prevention characteristic, and preferably, the composition of a silver paste material used for the silver paste coating comprises the following components in percentage by weight: 8-20% of spherical silver powder, and the particle size of the spherical silver powder is 2.5-6 mu m; 40-60% of flake silver powder with the particle size of 3-6 μm; 5-12% of nano silver powder, and the particle size of the nano silver powder is 18-60 nm; the organic carrier adopts 15-25% of vinyl resin, and the particle size of the vinyl resin is 0.9-1.5 mu m; 5-15% of a DBE solvent; the thickness of the insulating film is 0.025-0.1 mm, more preferably 0.038-0.05 mm, the thickness of the insulating film is smaller than the thickness of the insulating film, more preferably 0.025-0.038 mm, the silver paste coating thickness of the silver paste coating is 4-12 μm, the coating thickness of the graphene heating coating is 4-12 μm, and the total film thickness of the graphene heating sheet is 0.08-0.4 mm.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the waterproof graphene heating sheet is provided, the waterproof performance of the heating sheet at the side edge of a heating area is particularly enhanced, the installation margin of a graphene film layer in the production process of the graphene heating sheet is improved, and the local overheating damage of a product is avoided;
2. the preparation method of the waterproof graphene heating sheet is provided, so that the product is prevented from being degraded due to installation deviation of the graphene heating coating, the graphene heating coating cannot be in short circuit contact with a bus bar under the protection of the waterproof coating with the heating opening, and the prepared product cannot generate abnormal heating of a low-resistance area at the end point of a positive electrode wire and a negative electrode wire, so that the graphene heating coating can have larger selection elasticity, can be printed and formed on the printing surface of an insulating carrier film and also can be printed and formed on the binding surface of an insulating coating film, and the production process of the graphene heating sheet has larger manufacturing elasticity;
3. the method has the advantages that the used materials can be changed from the graphene heating film sheet into the graphene heating coating, and the graphene heating coating is prevented from influencing the product quality of the heating sheet;
4. the problem of graphite alkene generate heat the piece use graphite alkene generate heat the diaphragm with the positive negative electrode line between the contact interface produce the pressfitting gap easily is solved to graphite alkene generates heat the coating and can not overflow or be stained with and glue and contact the busbar when the printing forms, compares in diaphragm formula graphite alkene rete, has the effect that improves the product quality and the production yield of the piece that generates heat in addition to reducing the use cost of graphite alkene material.
Drawings
Fig. 1 is a schematic bottom view of a part of a waterproof graphene heating sheet according to a first preferred embodiment of the invention;
fig. 2 is a schematic partial top view illustrating a graphene heating sheet according to a first preferred embodiment of the invention;
fig. 3 is a schematic partial sectional view illustrating the graphene heating sheet according to the first preferred embodiment of the present invention, which is configured to transversely section the positive electrode line and the negative electrode line along a direction parallel to the length of the bus bar;
fig. 4 is a schematic partial sectional view of the graphene heating sheet according to the first preferred embodiment of the invention along the length direction of the positive electrode line;
fig. 5 is a schematic bottom view of a part of a waterproof graphene heating sheet according to a second preferred embodiment of the invention;
fig. 6 is a schematic partial top view illustrating a graphene heating sheet according to a second preferred embodiment of the invention;
fig. 7 is a schematic partial sectional view of a graphene heat generating sheet according to a second preferred embodiment of the invention along the length direction of a positive electrode line;
fig. 8 is a schematic partial sectional view of a waterproof graphene heating sheet according to a third preferred embodiment of the invention, taken along the length direction of a positive electrode line;
fig. 9 is a flow chart illustrating a process for manufacturing a waterproof graphene heating sheet according to the present invention;
fig. 10A to 10E are schematic cross-sectional views of partial elements of main steps in a manufacturing process of a waterproof graphene heating sheet according to a fourth preferred embodiment of the invention;
fig. 11A and 11B are schematic cross-sectional views of partial elements in a main step of forming a graphene heating coating and attaching an insulating coating in a manufacturing process of another waterproof graphene heating sheet according to a fifth preferred embodiment of the invention.
The number of the parts is 10, an insulating carrier film, 11, a printing surface, 20, a silver paste coating, 21, a positive electrode wire, 22, a negative electrode wire, 23, a first bus bar, 24, a second bus bar, 25, a first end point, 26, a second end point, 30, a waterproof coating, 31, a heating opening, 40, an insulating covering film, 50, a graphene heating coating and 60, an adhesive layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of embodiments for understanding the inventive concept of the present invention, and do not represent all embodiments, nor do they explain only embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention under the understanding of the inventive concept of the present invention are within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In order to more conveniently understand the technical scheme of the present invention, the graphene heating sheet, the preparation method thereof, and the silver paste material of the present invention are further described and explained in detail below, but are not to be taken as the protection scope defined by the present invention.
Fig. 1 is a schematic bottom view of a part of a waterproof graphene heating sheet according to a first preferred embodiment of the invention; fig. 2 is a schematic partial top view of the graphene heating sheet; fig. 3 is a schematic partial sectional view of the graphene heating sheet transversely sectioning the positive electrode line and the negative electrode line along a direction parallel to the length of the bus bar; fig. 4 is a schematic partial sectional view of the graphene heating sheet along the length direction of the positive electrode line; referring to fig. 1 to 4, a first preferred embodiment of the present invention provides a waterproof graphene heating sheet, which includes an insulating carrier film 10, a silver paste coating 20, a waterproof coating 30, an insulating cover film 40, and a graphene heating coating 50, wherein an important feature of the present embodiment is that under protection of a specific pattern of the waterproof coating 30, the graphene heating coating 50 can be selectively printed on the insulating carrier film 10 or printed on the insulating cover film 40.
The insulating carrier film 10 is provided with a printing surface 11, the insulating carrier film 10 can be a PET polyester film, the color can be transparent, white or black, and the insulating carrier film is a transparent insulating carrier film and is used for observing whether the position of the silver paste coating 20 is printed well or not from the back. The insulating carrier film 10 serves to provide protection for the surface of the printed carrier and the product.
In a specific but non-limiting embodiment, as shown in fig. 3 and 4, the silver paste coating 20 is printed on the printing surface 11 of the insulating carrier film 10, the silver paste coating 20 includes a positive electrode pattern and a negative electrode pattern that are not directly electrically connected to each other, and in a specific but non-limiting embodiment, as shown in fig. 1 and 2, the positive electrode pattern integrally forms a plurality of positive electrode lines 21 and first bus bars 23 connecting the positive electrode lines 21, the negative electrode pattern integrally forms a plurality of negative electrode lines 22 and second bus bars 24 connecting the negative electrode lines 22, the positive electrode lines 21 and the negative electrode lines 22 are arranged in an equidistant and staggered manner, the positive electrode lines 21 have first end points 25 facing the second bus bars 24, and the negative electrode lines 22 have second end points 26 facing the first bus bars 23. In general, the gap between the first end point 25 and the second bus bar 24 and the gap between the second end point 26 and the first bus bar 23 are smaller than the distance between the positive electrode line 21 and the adjacent negative electrode line 22. The silver paste coating 20 is specifically a conductive circuit formed by silver paste printing, and is formed after printing and curing, so that the conductive circuit has excellent conductivity and soft anti-fracture toughness. The silver paste coating 20 functions to provide an electrically conductive path for converting the electric energy of the heat generating sheet product into the heat energy.
Referring to fig. 4, the waterproof coating 30 is printed on the printing surface 11 of the insulating carrier film 10, the waterproof coating 30 covers the first bus bar 23 and the second bus bar 24, the waterproof coating 30 has a heating opening 31 exposing the positive electrode line 21 and the negative electrode line 22, and a specific material of the waterproof coating 30 may be vinyl resin. Waterproof coating 30's effect mainly has two, forms in the process firstly insulating protection before the graphite alkene generates heat coating 50 first busbar 23 with second busbar 24, secondly can strengthen in the product use the side water-proof effects of waterproof nature graphite alkene generates heat the piece provides the whole waterproof performance of product, makes the piece product that generates heat steep and does not damage.
The insulating coating 40 is attached to the printing surface 11 of the insulating carrier film 10, the insulating coating 40 is used for covering exposed graphene materials and silver paste materials printed on the insulating carrier film 10, and the insulating coating 40 is matched with the insulating carrier film 10 and the waterproof coating 30 to waterproof and seal the silver paste coating 20 and the graphene heating coating 50. A specific material of the insulating coating 40 may be transparent PET polyester such as the insulating support film 10. In an example, the insulating coating 40 can be attached to the waterproof coating 30, the graphene heating coating 50 and the insulating carrier film 10 by using an adhesive layer 60, and in a variation, the insulating coating 40 can be attached to the exposed surfaces of the waterproof coating 30, the graphene heating coating 50 and the insulating carrier film 10 by using the hot-press bonding of the insulating coating 40 itself.
The graphene heating coating 50 is selectively printed and formed on the printing surface 11 of the insulating carrier film 10 or on the binding surface of the insulating coating 40, the graphene heating coating 50 continuously covers the positive electrode line 21, the negative electrode line 22 and a spacing portion between the positive electrode line 21 and the negative electrode line 22 through the heating opening 31, as shown in fig. 3, generally but not limited to, the spacing portion is a thin film portion located between the first bus bar 23 and the second bus bar 24 and exposed to the positive electrode line 21 and the negative electrode line 22 in the printing surface 11 of the insulating carrier film 10, wherein the insulating coating 40 covers the graphene heating coating 50 and the rest portions of the waterproof coating 30 outside the coverage area of the graphene heating coating 50. The graphene heating coating 50 is used for providing a resistance heating material between the positive electrode and the negative electrode in the process of converting electric energy of the heating sheet product into heat energy.
Through the technical scheme, one technical effect of the embodiment is that the graphene heating sheet product can be put into a washing machine together with clothes for washing, and the heating function is not damaged.
The implementation principle of the embodiment is as follows: the waterproof coating 30 printed on the insulating carrier film 10 enhances the side waterproof performance of the graphene heating sheet, meanwhile, the first bus bar 23 and the second bus bar 24 are insulated and protected, the graphene heat-generating coating 50 is prevented from accidentally contacting the first bus bar 23 and the second bus bar 24, and by utilizing the heating opening 31 of the waterproof coating 30, the graphene heating coating 50 continuously covers the positive electrode wire 21, the negative electrode wire 22 and the interval part between the positive electrode wire 21 and the negative electrode wire 22 through the heating opening 31, so that normal and uniform heating in the heating opening 31 is ensured, the lateral edge waterproof performance of the graphene heating sheet can be improved, the installation margin of the graphene heating coating 50 is increased, and the yield and the product durability of the graphene heating sheet can be improved.
Regarding a specific but non-limiting size design of the heat-generating opening, in a preferred example, referring to fig. 1, fig. 2 and fig. 4, the width of the heat-generating opening 31 is slightly smaller than the gap between the first bus bar 23 and the second bus bar 24, so that the waterproof coating 30 substantially covers the first bus bar 23 and the second bus bar 24 and the first end 25 of the positive electrode line 21 and the second end 26 of the negative electrode line 22 are exposed in the heat-generating opening 31. By utilizing the large limitation of the size of the heating opening 31, the heating opening 31 of the waterproof coating 30 exposes the end points of the positive electrode line 21 and the negative electrode line 22, the contact length ratio of the graphene heating coating 50 to the positive electrode line 21 and the negative electrode line 22 is increased, and the exposed surfaces of the first bus bar 23 and the second bus bar 24 are completely covered in an insulating manner, so that the graphene heating coating 50 is in good electrical contact with both the positive electrode line 21 and the negative electrode line 22.
Regarding a specific but non-limiting dimension design of the graphene heat-generating coating, in a preferred example, the coverage area of the graphene heat-generating coating 50 is larger than the opening dimension of the heat-generating opening 31, so that by using the coverage area of the graphene heat-generating coating 50 larger than the opening dimension of the heat-generating opening 31, the graphene heat-generating coating 50 can be ensured to have a larger installation margin to completely cover the heat-generating opening 31, and no blank space lacking the graphene heat-generating coating material is formed in the heat-generating opening 31. Preferably, two side edges of the graphene heating coating 50 are partially overlapped on the first bus bar 23 and the second bus bar 24, and by utilizing the two side edges of the graphene heating coating to be partially overlapped on the bus bars, the alignment relationship between the two patterns of the graphene heating coating and the silver paste coating can be conveniently observed on the rest of metal surfaces exposed out of the graphene heating coating by the bus bars. Alternatively, as shown in fig. 8, in a modified example, the graphene heat-generating coating 50 is located in the heat-generating opening 31. Therefore, the thickness of the graphene heating sheet is further reduced by positioning the graphene heating coating 50 in the heating opening 31.
Regarding the heating area generated by the coverage of the graphene heating coating as a definable characteristic, in a preferred example, the width of the heating area of the graphene heating coating 50 covering the positive electrode lines 21 and the negative electrode lines 22 depends on the smaller of the cell extension length of the positive electrode lines 21 and the negative electrode lines 22 and the width of the heating opening 31. As shown in fig. 4, the width of the heating region of the graphene heating coating 50 covering the positive electrode line 21 and the negative electrode line 22 depends on the first unit extension length of the positive electrode line 21 and the negative electrode line 22, wherein the first unit extension length is smaller than the width of the heating opening 31, as shown in fig. 7, the width of the heating region of the graphene heating coating 50 covering the positive electrode line 21 and the negative electrode line 22 depends on the width of the heating opening 31, wherein the width of the heating opening 31 is smaller than the second unit extension length of the positive electrode line 21 and the negative electrode line 22. Therefore, the smaller of the unit extension lengths of the positive electrode line 21 and the negative electrode line 22 and the width of the heating opening 31 is used to determine the width of the heating area of the graphene heating coating 50 covering the positive electrode line 21 and the negative electrode line 22, and the graphene heating sheet with the defined heating area is redesigned according to the width change of the heating opening 31. For specific industrial applications, the unit extension lengths of the positive electrode line 21 and the negative electrode line 22 may be a common design, and the size of the heat-generating opening 31 may be a customized design.
Regarding a specific form of the positive electrode line and the negative electrode line, in a preferred example, a line gap between the adjacent positive electrode line 21 and the adjacent negative electrode line 22 is preferably between 0.4 cm and 1.2 cm; preferably, the arrangement of the positive electrode lines 21 and the negative electrode lines 22 is linear or wavy and staggered at intervals. The small size range of the line gap can divide a plurality of small module heating areas in the coverage area of the graphene heating coating 50, so that the low-voltage small-area module can heat. Therefore, the block resistance value of the graphene heating coating 50 can be accurately defined by using the positive electrode wires 21 and the negative electrode wires 22 which are linearly and alternately arranged, or the bending-resistant fracture toughness of the positive electrode wires 21 and the negative electrode wires 22 can be increased by using the positive electrode wires 21 and the negative electrode wires 22 which are wavy and alternately arranged. It is particularly noted that the term "interlaced" is obviously not a cross interconnection of the positive electrode lines 21 and the negative electrode lines 22, but refers to an alternate configuration of the positive electrode lines 21 and the negative electrode lines 22 and makes them not directly connected to each other, one or a group of negative electrode lines 22 should be separated between the positive electrode lines 21 and the adjacent positive electrode lines 21, and the positive electrode lines 21 are defined as one electrode line or a group of positive electrode lines formed by a plurality of electrode lines.
Regarding the product characteristics of the graphene heating sheet and the circuit shape and material selection of the silver paste coating layer, in a preferred example, the waterproof graphene heating sheet has a water washing resistance, and the unit line widths of the positive electrode lines 21 and the negative electrode lines 22 are smaller than the unit line widths of the first bus bars 23 and the second bus bars 24 and have a rubbing resistance to prevent circuit breakage, and preferably, the composition of the silver paste material used for the silver paste coating layer 20 includes, by weight: 8-20% of spherical silver powder, and the particle size of the spherical silver powder is 2.5-6 mu m; 40-60% of flake silver powder with the particle size of 3-6 μm; 5-12% of nano silver powder, and the particle size of the nano silver powder is 18-60 nm; the organic carrier adopts 15-25% of vinyl resin, and the particle size of the vinyl resin is 0.9-1.5 mu m; 5-15% of a DBE solvent; 0.1 to 1% of an oxide additive, and an average particle diameter of 0.4 to 1.0 μm. Therefore, the waterproof graphene heating sheet has the characteristic of water washing resistance, so that the graphene heating sheet can be used as a clothes lining interlayer. Preferably, with the specific composition of the silver paste material used for the silver paste coating 20, the positive and negative electrode wires 21, 22 formed by the silver paste coating and being thinner with respect to the bus bars are realized to have a flexible characteristic of being resistant to flexing and breaking.
Regarding the feasible specific range of the thickness and the total thickness of each component of the graphene heating sheet, in a preferred example, the thickness of the polyester film of the insulating carrier film is 0.025-0.1 mm, more preferably 0.038-0.05 mm, the thickness of the polyester film of the insulating cover film is smaller than the thickness of the polyester film of the insulating carrier film, preferably 0.025-0.038 mm, the silver paste coating thickness of the silver paste coating is 4-12 μm, the coating thickness of the graphene heating coating is 4-12 μm, and the total thickness of the graphene heating sheet is 0.08-0.4 mm. Therefore, the thickness range of each film layer is limited, and the thickness range comprises a specific polyester film thickness range, a brushing thickness range of the silver paste coating and the graphene heating coating, and a total film thickness range of the graphene heating sheet, so that the graphene heating sheet has a sufficiently thin structure, and is more easily attached to a human body or clamped in a clothes lining.
Fig. 5 is a partial bottom view schematically illustrating another waterproof graphene heating sheet according to a second preferred embodiment of the invention; fig. 6 is a schematic top view of a part of the graphene heating sheet; fig. 7 is a schematic partial sectional view of the graphene heating sheet along the length direction of the positive electrode line; referring to fig. 5 to 7, a second preferred embodiment of the present invention provides a waterproof graphene heating sheet, which includes an insulating carrier film 10, a silver paste coating 20, a waterproof coating 30, an insulating coating 40, and a graphene heating coating 50.
The insulating carrier film 10 is provided with a printing surface 11, the silver paste coating 20 is formed on the printing surface 11 of the insulating carrier film 10 in a printing mode, the silver paste coating 20 comprises a positive electrode pattern and a negative electrode pattern which are not directly electrically connected with each other, a plurality of positive electrode wires 21 and first bus bars 23 connected with the positive electrode wires 21 are integrally formed on the positive electrode pattern, a plurality of negative electrode wires 22 and second bus bars 24 connected with the negative electrode wires 22 are integrally formed on the negative electrode pattern, the positive electrode wires 21 and the negative electrode wires 22 are arranged in an equidistant and staggered mode, the positive electrode wires 21 are provided with first end points 25 facing the second bus bars 24, and the negative electrode wires 22 are provided with second end points 26 facing the first bus bars 23. The waterproof coating 30 is printed on the printing surface 11 of the insulating carrier film 10, the waterproof coating 30 covers the first bus bar 23 and the second bus bar 24, and the waterproof coating 30 has a heating opening 31 exposing the positive electrode line 21 and the negative electrode line 22. The insulating coating 40 is attached to the printing surface 11 of the insulating carrier film 10. The graphene heating coating 50 is selectively printed on the printing surface 11 of the insulating carrier film 10 or the binding surface of the insulating coating 40, the graphene heating coating 50 continuously covers the positive electrode wire 21, the negative electrode wire 22 and the interval between the positive electrode wire 21 and the negative electrode wire 22 through the heating opening 31, wherein the insulating coating 40 covers the graphene heating coating 50 and the waterproof coating 30 covers the rest of the graphene heating coating 50 outside the coverage area.
Regarding another specific but non-limiting dimension design of the heat generating opening, in a preferred example, the width of the heat generating opening 31 is slightly smaller than the unit extension length of the positive electrode line 21 and the negative electrode line 22, so that the waterproof coating 30 substantially covers the first bus bar 23, the second bus bar 24, the first end 25 of the positive electrode line 21 and the second end 26 of the negative electrode line 22. Therefore, by utilizing the smaller limitation of the size of the heating opening 31, the waterproof coating 30 substantially covers the non-connection end points of the positive electrode line 21 and the negative electrode line 22, and the non-connection end points of the positive electrode line 21 and the negative electrode line 22 are fixed in the manufacturing process of the graphene heating sheet, so that the end points of the positive electrode line 21 and the negative electrode line 22 can be more firmly prevented from shifting or skewing.
With regard to one extraction electrode structure of the positive electrode pattern and the negative electrode pattern, in a preferred example, the positive electrode pattern further includes an extraction positive electrode integrally connected to the first bus bar and exposed to the insulating coating film, and the negative electrode pattern further includes an extraction negative electrode integrally connected to the second bus bar and exposed to the insulating coating film. Therefore, the extraction of the positive electrode and the negative electrode on one side of the membrane is realized by the extraction positive electrode and the extraction negative electrode, and the graphene heating coating 50 can be completely sealed. Regarding a lead-out connection manner of the positive electrode pattern and the negative electrode pattern, in a preferred example, the lead-out positive electrode and the lead-out negative electrode have a riveting hole structure, and preferably, each of the lead-out positive electrode and the lead-out negative electrode has two or more riveting holes 27. The staking holes may be prepared in advance by special equipment and special dies. Preferably, each leading-out electrode is provided with two or more riveting holes 27, so that the stability of external electric connection can be improved, better riveting performance is achieved, the problem of connection requirement caused by the defect of one riveting hole 27 is prevented, abnormal heating and even burning loss of a riveting position in the heating process caused by virtual connection are prevented, the problems can be effectively avoided by the design of the compound riveting hole, and when one riveting terminal is in a problem, the other riveting terminal can still meet the requirement. Then, a transfer welding method can be adopted, and welding operation is performed through a conductive structure which is connected with the riveting hole 27 and led out of the polyester film.
Regarding another lead-out connection manner of the positive electrode pattern and the negative electrode pattern, in a preferred example, the lead-out positive electrode and the lead-out negative electrode are connected to a Flexible Printed Circuit (FPC) by an ACF conductive adhesive (anisotropic conductive adhesive). The ACF conductive adhesive is used as a bonding agent, technical bonding is carried out in a pulse hot pressing mode, and the flexible circuit board is used as an external connection material for switching, so that a high-temperature-resistant welding lead capable of being subjected to welding processing is formed under high-strength bonding. Therefore, the ACF conductive adhesive is used for connecting the leading-out positive electrode and the leading-out negative electrode to the flexible circuit board, so that the waterproof external electric connection of the other graphene heating sheet is realized, and the graphene heating sheet and the flexible circuit board connected with the graphene heating sheet can be bent. In addition, the ACF conductive adhesive contains adhesive synthetic resin and conductive particles with equal spherical diameter, and the particle diameter of the conductive particles is about 20 +/-2 μm. The ACF conductive adhesive can be 3M7303 conductive adhesive.
Fig. 9 is a flow chart illustrating a process for manufacturing a waterproof graphene heating sheet according to the present invention; fig. 10A to 10E are schematic cross-sectional views of partial elements of main steps in a manufacturing process of a waterproof graphene heating sheet according to a fourth preferred embodiment of the invention. A fourth preferred embodiment of the present invention provides a method for preparing a waterproof graphene heating sheet, including the following steps:
referring to step S1 of fig. 9 and fig. 10A, providing an insulating carrier film 10, wherein the insulating carrier film 10 has a printing surface 11;
referring to step S2 of fig. 9 and fig. 10B, printing a silver paste coating 20 on the printing surface 11 of the insulating carrier film 10, where the silver paste coating 20 includes a positive electrode pattern and a negative electrode pattern that are not directly electrically connected to each other, the positive electrode pattern integrally forms a plurality of positive electrode lines 21 and first bus bars 23 connecting the positive electrode lines 21, the negative electrode pattern integrally forms a plurality of negative electrode lines and second bus bars 24 connecting the negative electrode lines, and the positive electrode lines 21 and the negative electrode lines are arranged in an equidistant staggered manner;
referring to step S3 and fig. 10C of fig. 9, a waterproof coating 30 is printed on the printing surface 11 of the insulating carrier film 10, the waterproof coating 30 covers the first bus bar 23 and the second bus bar 24, the waterproof coating 30 has a heating opening 31, and the positive electrode lines 21 and the negative electrode lines are exposed;
referring to step S4 of fig. 9 and fig. 10D, a graphene heating coating 50 is printed on the printing surface 11 of the insulating support film 10 or on the bonding surface of the insulating support film, in this example, the graphene heating coating 50 is formed on the printing surface 11 of the insulating support film 10, in a different example, as shown in fig. 11A, the graphene heating coating 50 may also be formed on the bonding surface of the insulating support film 40;
referring to step S4 of fig. 9 and fig. 10E, the insulating coating 40 is attached to the printing surface 11 of the insulating carrier film 10, the graphene heating coating 50 continuously covers the positive electrode line 21, the negative electrode line and the interval between the positive electrode line 21 and the negative electrode line through the heating opening 31, wherein the insulating coating 40 covers the graphene heating coating 50 and the rest of the waterproof coating 30 outside the coverage area of the graphene heating coating 50. In this example, the graphene heating coating 50 already covers the positive electrode line 21 before the lamination, and in a different example, as shown in fig. 11B, the graphene heating coating 50 covers the positive electrode line 21 simultaneously during the lamination.
The technical effects of the embodiment include, but are not limited to, that a waterproof graphene heating sheet can be manufactured with a large installation margin of a graphene film layer, and abnormal heating of a low-resistance region at an end point of a positive electrode line and a negative electrode line of a product is avoided.
Specifically, the above main steps S1 to S5 are performed on a film mother sheet, a plurality of unit regions corresponding to the shape of the product film are integrated together, and the desired individual shape is cut after the printing and bonding processes are completed.
In a preferred example, the width of the heat-generating opening 31 is slightly smaller than the gap between the first bus bar 23 and the second bus bar 24, so that the waterproof coating 30 substantially covers the first bus bar 23 and the second bus bar 24 and the end points of the positive electrode line 21 and the negative electrode line are exposed in the heat-generating opening 31, or the width of the heat-generating opening 31 is slightly smaller than the unit extension length of the positive electrode line 21 and the negative electrode line, so that the waterproof coating 30 substantially covers the first bus bar 23, the second bus bar, and the end points of the positive electrode line 21 and the negative electrode line.
In a preferred example, the waterproof graphene heating sheet has a water washing resistance characteristic, and the unit line widths of the positive electrode lines 21 and the negative electrode lines are smaller than the unit line widths of the first bus bars 23 and the second bus bars 24, and the waterproof graphene heating sheet has a characteristic of resisting rubbing and preventing line breakage, and preferably, the composition of a silver paste material used for the silver paste coating comprises the following components in percentage by weight: 8-20% of spherical silver powder, and the particle size of the spherical silver powder is 2.5-6 mu m; 40-60% of flake silver powder with the particle size of 3-6 μm; 5-12% of nano silver powder, and the particle size of the nano silver powder is 18-60 nm; the organic carrier adopts 15-25% of vinyl resin, and the particle size of the vinyl resin is 0.9-1.5 mu m; 5-15% of a DBE solvent; the thickness of the insulating film is 0.025-0.1 mm, more preferably 0.038-0.05 mm, the thickness of the insulating film is smaller than the thickness of the insulating film, more preferably 0.025-0.038 mm, the silver paste coating thickness of the silver paste coating is 4-12 μm, the coating thickness of the graphene heating coating is 4-12 μm, and the total film thickness of the graphene heating sheet is 0.08-0.4 mm.
The washing machine washing simulation test is carried out on the graphene heating sheet provided by the embodiment of the invention; the experimental conditions included: 1. the test method comprises the following steps: washing machine continuous washing test 100H, 2. washing machine specification: drum washer/pulsator washer 3. addition material: washing powder/laundry detergent. The experimental method comprises the steps of 1, placing the sample in a washing machine for testing, turning on a switch of the washing machine to a powerful mode, setting the time to be 100 hours, 2, simulating a normal washing process in the washing machine, adding washing powder/washing liquid, and 3, continuously testing until the time reaches 100H without stopping the washing machine in the testing process. Through experiments, the graphene heating sheet provided by the embodiment obtains the following test results: 1. the break/short circuit test condition is no break/short circuit before and after the experiment, the contact impedance change condition is no change of 50 omega before and after the experiment, and the graphene ink surface does not fall off before and after the experiment.
The graphene heating sheet provided by the embodiment of the invention is used for carrying out an adhesion test; using a tool: 2, judging the method: the baked graphene heating sheet is horizontally placed on a lamp table, a rubber belt is attached to a printing surface by about 10cm, the 3M600 rubber belt is torn up at a 45 ℃ angle after 1 minute, and whether the ink falling phenomenon exists is observed. Through tests, the graphene heating sheet provided by the embodiment has no ink falling off.
The embodiments of the present invention are merely preferred embodiments for easy understanding or implementing of the technical solutions of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes in structure, shape and principle of the present invention should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a waterproof nature graphite alkene piece that generates heat which characterized in that includes:
an insulating carrier film (10) having a printing surface (11);
a silver paste coating (20) printed on the printing surface (11) of the insulating carrier film (10), wherein the silver paste coating (20) comprises a positive electrode pattern and a negative electrode pattern which are not directly electrically connected with each other, the positive electrode pattern is integrally formed with a plurality of positive electrode wires (21) and first bus bars (23) connected with the positive electrode wires (21), the negative electrode pattern is integrally formed with a plurality of negative electrode wires (22) and second bus bars (24) connected with the negative electrode wires (22), the positive electrode wires (21) and the negative electrode wires (22) are arranged in an equidistant and staggered manner, the positive electrode wires (21) have first end points (25) facing the second bus bars (24), and the negative electrode wires (22) have second end points (26) facing the first bus bars (23);
the waterproof coating (30) is printed and formed on the printing surface (11) of the insulating carrier film (10), the waterproof coating (30) covers the first bus bar (23) and the second bus bar (24), and the waterproof coating (30) is provided with a heating opening (31) for exposing the positive electrode wire (21) and the negative electrode wire (22);
an insulating coating (40) applied to the printing surface (11) of the insulating carrier film (10), and
the graphene heating coating (50) is formed on the printing surface (11) of the insulating carrier film (10) or on the binding surface of the insulating coating film (40) in a selective printing mode, the graphene heating coating (50) continuously covers the positive electrode wire (21), the negative electrode wire (22) and a spacing part between the positive electrode wire (21) and the negative electrode wire (22) through the heating opening (31), and the insulating coating film (40) covers the graphene heating coating (50) and the rest parts of the waterproof coating (30) outside the coverage area of the graphene heating coating (50).
2. The graphene heat generating sheet according to claim 1, wherein the width of the heat generating opening (31) is slightly smaller than the gap between the first bus bar (23) and the second bus bar (24), so that the waterproof coating (30) substantially covers the first bus bar (23) and the second bus bar (24) and the first end (25) of the positive electrode wire (21) and the second end (26) of the negative electrode wire (22) are exposed in the heat generating opening (31).
3. The graphene heat generating sheet according to claim 1, wherein the width of the heat generating opening (31) is slightly smaller than the unit extension length of the positive electrode line (21) and the negative electrode line (22), so that the waterproof coating (30) substantially covers the first bus bar (23), the second bus bar (24), the first end point (25) of the positive electrode line (21), and the second end point (26) of the negative electrode line (22).
4. The waterproof graphene heat generating sheet according to claim 1, wherein a coverage area of the graphene heat generating coating (50) is larger than an opening size of the heat generating opening (31), or the graphene heat generating coating (50) is located in the heat generating opening (31).
5. The waterproof graphene heating sheet according to claim 1, wherein the width of the heating area of the graphene heating coating (50) covering the positive electrode wire (21) and the negative electrode wire (22) depends on the smaller of the unit extension length of the positive electrode wire (21) and the negative electrode wire (22) and the width of the heating opening (31), preferably, the line gap between the adjacent positive electrode wire (21) and the negative electrode wire (22) is 0.4-1.2 cm; preferably, the arrangement mode of the positive electrode wires (21) and the negative electrode wires (22) is linear or wavy and interval staggered; preferably, two side edges of the graphene heat-generating coating (50) are partially overlapped on the first bus bar (23) and the second bus bar (24).
6. The waterproof graphene heating sheet according to any one of claims 1 to 5, wherein the waterproof graphene heating sheet has a water washing resistance characteristic, the unit line widths of the positive electrode lines (21) and the negative electrode lines (22) are smaller than the unit line widths of the first bus bars (23) and the second bus bars (24) and have a characteristic of resisting rubbing and preventing line breakage, and preferably the composition of a silver paste material used for the silver paste coating layer (20) comprises the following components in weight ratio: 8-20% of spherical silver powder, and the particle size of the spherical silver powder is 2.5-6 mu m; 40-60% of flake silver powder with the particle size of 3-6 μm; 5-12% of nano silver powder, and the particle size of the nano silver powder is 18-60 nm; the organic carrier adopts 15-25% of vinyl resin, and the particle size of the vinyl resin is 0.9-1.5 mu m; 5-15% of a DBE solvent; 0.1 to 1% of an oxide additive, and an average particle diameter of 0.4 to 1.0 μm.
7. The waterproof graphene heating sheet according to claim 6, wherein the polyester film thickness of the insulating carrier film (10) is 0.025-0.1 mm, more preferably 0.038-0.05 mm, the polyester film thickness of the insulating coating film (40) is less than the polyester film thickness of the insulating carrier film (10), preferably 0.025-0.038 mm, the silver paste coating thickness (20) is 4-12 μm, the painting thickness of the graphene heating coating (50) is 4-12 μm, and the total film thickness of the graphene heating sheet is 0.08-0.4 mm.
8. A preparation method of a waterproof graphene heating sheet is characterized by comprising the following steps:
providing an insulating carrier film (10), wherein the insulating carrier film (10) is provided with a printing surface (11);
printing and forming a silver paste coating (20) on the printing surface (11) of the insulating carrier film (10), wherein the silver paste coating (20) comprises a positive electrode pattern and a negative electrode pattern which are not directly electrically connected with each other, the positive electrode pattern is integrally formed with a plurality of positive electrode wires (21) and first bus bars (23) connected with the positive electrode wires (21), the negative electrode pattern is integrally formed with a plurality of negative electrode wires (22) and second bus bars (24) connected with the negative electrode wires (22), and the positive electrode wires (21) and the negative electrode wires (22) are arranged in an equidistant and staggered manner;
printing and forming a waterproof coating (30) on the printing surface (11) of the insulating carrier film (10), wherein the waterproof coating (30) covers the first bus bar (23) and the second bus bar (24), and the waterproof coating (30) is provided with a heating opening (31) for exposing the positive electrode wire (21) and the negative electrode wire (22);
printing a graphene heat-generating coating (50) on the printing surface (11) of the insulating support film (10) or on the bonding surface of the insulating coating film (40), and
the printing surface (11) of the insulating carrier film (10) is attached with the insulating coating film (40), the graphene heating coating (50) continuously covers the positive electrode wire (21), the negative electrode wire (22) and a gap between the positive electrode wire (21) and the negative electrode wire (22) through the heating opening (31), wherein the insulating coating film (40) covers the graphene heating coating (50) and the rest of the waterproof coating (30) outside the coverage area of the graphene heating coating (50).
9. The method for preparing a waterproof graphene heating sheet according to claim 8, wherein the method comprises the following steps:
the width of the heating opening (31) is slightly smaller than the gap between the first bus bar (23) and the second bus bar (24) so that the waterproof coating (30) substantially covers the first bus bar (23) and the second bus bar (24) and the endpoints of the positive electrode wire (21) and the negative electrode wire (22) are exposed in the heating opening (31), or,
the width of the heating opening (31) is slightly smaller than the unit extension length of the positive electrode wire (21) and the negative electrode wire (22), so that the waterproof coating (30) substantially covers the first bus bar (23), the second bus bar (24) and the end points of the positive electrode wire (21) and the negative electrode wire (22).
10. The preparation method of the waterproof graphene heating sheet according to claim 8 or 9, wherein the waterproof graphene heating sheet has a water washing resistance, the unit line widths of the positive electrode lines (21) and the negative electrode lines (22) are smaller than the unit line widths of the first bus bars (23) and the second bus bars (24) and have a characteristic of resisting rubbing and preventing line breakage, and preferably the composition of a silver paste material used by the silver paste coating layer (20) comprises the following components in percentage by weight: 8-20% of spherical silver powder, and the particle size of the spherical silver powder is 2.5-6 mu m; 40-60% of flake silver powder with the particle size of 3-6 μm; 5-12% of nano silver powder, and the particle size of the nano silver powder is 18-60 nm; the organic carrier adopts 15-25% of vinyl resin, and the particle size of the vinyl resin is 0.9-1.5 mu m; 5-15% of a DBE solvent; 0.1-1% of oxide additive, wherein the average particle size of the oxide additive is 0.4-1.0 μm, the thickness of the polyester film of the insulating carrier film (10) is preferably 0.025-0.1 mm, more preferably 0.038-0.05 mm, the thickness of the polyester film of the insulating coating film (40) is smaller than the thickness of the polyester film of the insulating carrier film (10), preferably 0.025-0.038 mm, the silver paste painting thickness of the silver paste coating (20) is 4-12 μm, the painting thickness of the graphene heating coating (50) is 4-12 μm, and the total film thickness of the graphene heating sheet is 0.08-0.4 mm.
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