CN111473400A - Preparation method of graphene electrothermal picture - Google Patents
Preparation method of graphene electrothermal picture Download PDFInfo
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- CN111473400A CN111473400A CN202010296513.7A CN202010296513A CN111473400A CN 111473400 A CN111473400 A CN 111473400A CN 202010296513 A CN202010296513 A CN 202010296513A CN 111473400 A CN111473400 A CN 111473400A
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- layer
- infrared
- picture
- graphene
- graphene heating
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- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/20—Heat consumers
- F24D2220/2009—Radiators
- F24D2220/2036—Electric radiators
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P20/10—Process efficiency
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Abstract
The invention discloses a preparation method of a graphene electric heating picture, which comprises the steps of preparing a graphene heating body layer, overlapping an infrared reflecting layer on a heat insulation layer, and then assembling a decorative picture, the graphene heating body and an infrared reflecting-heat insulation plate in sequence from the outside to the inside. The electric heating picture prepared by the method increases the forward electric-thermal radiation efficiency, reduces the heat loss, has high far infrared radiation efficiency, increases the energy transfer efficiency between the heating body and the heating picture decoration layer, improves the efficiency of transferring the infrared radiation energy from the heating body to the electric heating picture decoration layer, improves the human body temperature at a longer distance, improves the human body far infrared physiotherapy experience, enhances the heating effect of the electric heating picture, improves the utilization efficiency of energy, saves energy and is environment-friendly.
Description
Technical Field
The invention belongs to the field of manufacturing of electric heating products, relates to application of a novel graphene material in the field of electric heating pictures, and particularly relates to a structure and a method for manufacturing a far infrared electric heating picture with double functions of heating and far infrared health care by adopting the novel graphene material.
Background
In recent years, the electric heating technology and the market are rapidly developed, more and more electric heating equipment enters common families particularly under the support of national northern coal-to-electricity policy, the safe and efficient heating requirements of northern families in the heating season are met, and important products and technical support are provided for continuously improving the air quality of northern main cities.
Graphene is a new material of great strategy developed in recent years, has the remarkable advantages of good heat conductivity and good electrical conductivity, and is gradually applied to various electronic products. In the field of electric heating, the graphene also gradually exerts the material advantages thereof, and gradually replaces the traditional carbon crystal heating element in an electric heating element to form the unique technical advantages of the graphene material.
Among all electric heating products, an electric heating picture (heating picture) is a product with great market prospect, because the electric heating picture organically combines heating with home interior decoration, namely, compared with other heating products, the electric heating picture has unique advantages in functionality and aesthetic characteristics. In addition, the electric heating picture does not occupy indoor space, has good far infrared physical therapy characteristic, and is more and more accepted and popular by the market.
At present, graphene electric heating paintings have a ubiquitous problem in the application process, namely the normal thermal radiation efficiency of an electric heating painting decoration layer is not high, so that the body feeling temperature of a human body is obviously reduced after the human body is far away from the electric heating paintings (beyond 1 m), the heating effect of the electric heating paintings is greatly reduced, the experience of the electric heating paintings in heating application is poor, and the large-scale application of the electric heating paintings is limited. The low heat radiation efficiency of the electric heating drawing method has the following two reasons: firstly, because the safety problem is considered, the electric heating picture can not adopt a heating body with high power density, so that the power density of far infrared rays radiated from the picture surface is lower; secondly, in order to ensure the safety of the decorative layer (such as high temperature scald prevention, electric leakage prevention and the like), the electric heating picture on the market is structurally designed, natural isolation is realized between the decorative layer and the heating body through air (as shown in figure 1), and the electric heating picture has good surface insulation and surface overheating prevention performance, so that thermal resistance exists between the heating body and the picture, the energy of the heating body is absorbed by the decorative layer mainly in a thermal radiation mode, and the energy of the heating body cannot be transmitted to the electric heating picture decorative layer in time, so that the problems of temperature rise of the heating body, low far infrared radiation efficiency on the front surface of the decorative layer and.
Disclosure of Invention
The invention aims to provide a graphene electric heating picture and a preparation method thereof, aiming at the technical problems that the energy of a heating body of the existing electric heating picture cannot be transmitted to an electric heating picture decoration layer in time, and the far infrared radiation efficiency of the front surface of the decoration layer is low and the temperature rise speed is slow although the temperature of the heating body is raised.
In order to achieve the purpose of the present invention, in one aspect, the present invention provides a method for preparing a graphene heating picture, including the following steps:
A) preparation of graphene heating body layer
A-1) coating graphene heating slurry on the surface of a first insulating plate, and then baking to form a graphene heating film layer on the surface of the insulating plate;
a-2) printing silver paste on the surface of the graphene heating film layer, overlapping the silver paste and the graphene heating film layer into a whole, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-insulating plate;
a-3) coating an adhesive on the surface of a second insulating plate, and performing press-fitting treatment on the adhesive and the silver paste electrode-graphene heating layer-insulating plate prepared in the step 2) to enable the graphene heating film layer to be sandwiched between the two insulating plates to prepare a graphene heating body layer, and meanwhile, reserving a corresponding through hole on a second edge plate corresponding to the position of the silver paste electrode for connecting the silver paste and leading out an external power line;
B) preparation of infrared reflection-insulation board
Covering an infrared reflecting layer on the surface of one side of the heat-insulation plate by means of bonding, coating, printing or vapor deposition, wherein the infrared reflecting layer is an aluminum, silver, copper, Polyethylene (PE), glass fiber or PET film, and preparing the infrared reflecting-heat-insulation plate;
C) assembly
The method comprises the steps of assembling a decorative picture, a graphene heating body and an infrared reflection-insulation board in sequence from the outside to the inside by adopting a metal frame, and arranging adjacent two layers at intervals to obtain the graphene electric heating picture, wherein an infrared reflection layer of the infrared reflection-insulation board faces towards a graphene heating body layer.
The graphene heating slurry in the step A-1) comprises a graphene heating raw material and an auxiliary additive, wherein the weight ratio of the graphene heating raw material to the auxiliary additive is 100: (10-80), preferably 100: 60.
particularly, the graphene heating raw material is graphene; or a mixture of graphene and one of carbon nano tube, graphite alkyne, carbon black, graphite powder, metal nano wire and resin.
Particularly, the auxiliary agent comprises resin, a solvent, a thickening agent and a dispersing agent, wherein the resin is one or more of acrylic resin, polyurethane resin, phenolic resin, epoxy resin, inorganic silicon resin, organic silicon resin, polyester resin, polyamide resin and fluorocarbon resin; the solvent is one or more of water, N-methylpyrrolidone (NMP), isopropanol, ethanol, ethylene glycol, ethyl acetate, butyl acetate, cyclohexane, toluene and xylene; the thickening agent is one or more of polyisoethylene, ethyl cellulose, nitrocellulose, polyhexene ethanol and styrene; the dispersing agent is one or more of polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), Sodium Dodecyl Sulfate (SDS) and carboxymethyl cellulose (CMC).
Particularly, the weight ratio of the resin, the solvent, the thickening agent and the dispersing agent is 100: (10-90): (0.5-5): (0.5-5).
Wherein the thickness of the graphene heating film layer is 10-200 μm, preferably 50 μm.
Particularly, in the step A-1) and the step A-3), the insulating plate is made of glass fiber boards or mica boards; the temperature of the baking treatment in the step A-1) is 140-160 ℃, and preferably 150 ℃; the baking time is 50-90min, preferably 60 min.
In particular, the graphene heating paste is coated on the surface of the insulating plate by coating, printing or vapor deposition (chemical vapor deposition CVD, physical vapor deposition PVD).
Wherein the temperature of the baking treatment in the step A-2) is 120-160 ℃, and preferably 150 ℃; the baking time is 50-90min, preferably 60 min.
In particular, the thickness of the dry film of silver paste in the step A-2) is 10-50 μm (preferably 20-30 μm, and more preferably 25 μm).
Particularly, before the pressing treatment in the step A-3), copper sheets with the thickness of 12-500 μm are respectively placed on the surfaces of the silver paste at the positions of the two through holes to serve as connecting terminals, the size of each copper sheet is 3-10mm larger than the diameter of each through hole, and the copper sheets are packaged between the two insulating plates after the pressing treatment.
Wherein, the heat insulation board in the step B) is one of a glass magnesium board, a polyurethane heat insulation board and an extruded sheet (XPS), and is preferably a glass magnesium board.
In particular, the thickness of the infrared reflecting layer is 0.1 to 1000. mu.m, preferably 10 to 200. mu.m, and more preferably 100. mu.m.
In particular, the infrared reflecting layer is preferably an aluminum, silver or copper thin film.
In particular, the vapor deposition method is selected from Chemical Vapor Deposition (CVD) and Physical Vapor Deposition (PVD).
Wherein, in the step C), the spacing distance between two adjacent layers is 3-15mm, preferably 5 mm. The distance between two adjacent layers is 3-15mm, preferably 5mm, from the surface layer decorative picture, the graphene heating element and the heat insulation board from the outside to the inside.
Particularly, the surface decorative painting selects high-temperature-resistant canvas or a PET (polyethylene terephthalate) base material, and the decorative painting patterns are sprayed and painted on the surface of the base material through a UV (ultraviolet) spray painting machine.
Particularly, the method also comprises A-3-1) connecting an external power line with the silver paste electrode in a welding or riveting mode, and carrying out insulation treatment at the position of the through hole. The heating body finally comprises two layers of glass fiber plates, a graphene heating layer and a silver paste electrode, and the total thickness is 3 mm.
Especially, set up temperature controller, socket on external power supply line for control graphite alkene generate heat the layer make-break electricity and control graphite alkene generate heat the temperature of layer, improve the safety in utilization of electric heat picture.
In particular, the total thickness of the electric heating picture is 0.5-5cm, and 1cm is preferred.
Particularly, the method also comprises the step A-4) of preparing the infrared enhancement-graphene heating element, wherein the surface of the insulating plate of the graphene heating element layer is coated with infrared enhancement slurry and then is baked, and the infrared enhancement slurry is solidified to form an infrared enhancement layer, so that the infrared enhancement-graphene heating element is prepared; finally, in the assembling process, assembling the decorative picture, the stone infrared enhancement-graphene heating element and the infrared reflection-insulation board in sequence from the outside to the inside by adopting a metal frame, and arranging adjacent two layers at intervals to prepare the graphene electric heating picture, wherein the infrared enhancement layer of the infrared enhancement-graphene heating element faces towards the decorative picture; the infrared reflection layer of the infrared reflection-insulation board faces the infrared enhancement-graphene heating body layer.
The infrared-enhanced slurry comprises an infrared-enhanced material and a binder, wherein the weight ratio of the infrared-enhanced material to the binder is (10-30) to (70-90), and preferably 20 to 80.
Particularly, the infrared reinforcing material is one or more of graphite, a micro-nano carbon material, nano silicon powder, metal oxide, silicon carbide, boron carbide, sodium silicate and aluminum silicate.
Particularly, the micro-nano carbon material is diamond, diamond-like carbon, graphene, graphite alkyne, carbon black or carbon nano tube; the metal oxide is ferric oxide, nickel oxide, chromium oxide, copper oxide, manganese oxide, cobalt oxide or aluminum oxide.
In particular, the infrared enhancement layer material is one or more of silicon carbide, graphene, silicon oxide or graphite.
In particular, the infrared enhancing layer material is selected as a powder having a particle size of 0.1-3 μm, preferably 0.1-0.5 μm.
In particular, the adhesive is selected from a water-based epoxy resin, a water-based acrylic resin, a vinyl acetate resin, a water-based polyurethane resin, a phenolic resin or a polyester resin, and is preferably a water-based epoxy resin.
In particular, the viscosity of the infrared enhancing paste is 1000-.
In particular, the infrared enhancing layer has a thickness of 0.1 to 1000. mu.m, preferably 10 to 300. mu.m, and more preferably 200. mu.m.
In particular, the infrared enhancement slurry is applied by spraying, printing, spin coating, curtain coating or deposition.
Particularly, the infrared enhancement layer material is silicon oxide and graphite, and the weight ratio of the silicon oxide to the graphite is 1: (0.5-3), preferably 1: 1.
In particular, the baking treatment temperature in the step A-4) is 120-160 ℃, and preferably 150 ℃; the baking time is 20-40min, preferably 30 min.
Particularly, the method also comprises the step A-5) of preparing the infrared absorption-decorative picture, coating infrared absorption slurry on the back surface of the surface layer decorative picture, then baking, and curing the infrared absorption slurry to form an infrared absorption layer to prepare the infrared absorption layer-decorative picture; finally, assembling the infrared absorption-decoration picture, the infrared enhancement-graphene heating body and the infrared reflection-insulation board in sequence from the outside to the inside by adopting a metal frame, and arranging adjacent two layers at intervals to prepare the graphene electric heating picture, wherein an infrared absorption layer of the infrared absorption-decoration picture faces towards the infrared enhancement-graphene heating body; the infrared enhancement layer of the infrared enhancement-graphene heating body faces towards the decorative picture; the infrared reflection layer of the infrared reflection-insulation board faces the infrared enhancement-graphene heating body layer.
Wherein, the infrared absorption slurry in the step A-5) comprises an infrared absorption material and a binder, wherein the weight ratio of the infrared absorption material to the binder is 10-30:70-90, preferably 15: 85.
Particularly, the infrared absorption material is one or more of indium tin oxide, tin antimony oxide, tungsten cesium oxide, tungsten tin oxide, zinc oxide, silicon oxide, aluminum oxide, calcium carbonate, titanium dioxide, wollastonite, silica gel powder, graphite, a micro-nano carbon material, nano silicon powder, melamine, polyphenylene sulfide, boric acid, resin, polyethylene wax, zinc stearate and white oil.
Particularly, the micro-nano carbon material is graphene, graphite alkyne, carbon black or a carbon nano tube; the resin is PP (polypropylene), PET, PC (polychloroprene), ABS (polyacrylonitrile-butadiene-styrene), PMMA (polymethyl methacrylate), PS (polystyrene) or PVC (polyvinyl chloride).
In particular, the infrared absorbing material is selected from carbon nano tube, graphene or zinc oxide.
In particular, the infrared absorbing material is selected as a powder having a particle size of 0.005 to 3 μm, preferably 0.005 to 0.5. mu.m.
The adhesive is selected from waterborne epoxy resin, waterborne acrylic resin, vinyl acetate resin, waterborne polyurethane resin, phenolic resin or polyester resin, and is preferably waterborne acrylic resin.
In particular, the viscosity of the absorber layer slurry is 500-.
Wherein the infrared absorption layer has a thickness of 0.1 to 1000. mu.m, preferably 50 to 200. mu.m, and more preferably 150. mu.m.
In particular, the infrared enhancing paste is applied by spraying, printing, spin coating, curtain coating or deposition.
In particular, the baking treatment temperature in the step A-5) is 120-160 ℃, and preferably 130 ℃; the baking time is 20-40min, preferably 40 min.
Particularly, the method also comprises the step A-6) of laminating the decorative picture protective layer, covering a PET film on the surface of the surface decorative picture or coating curing type UV gloss oil on the surface of the surface decorative picture, irradiating by UV light and curing to form the decorative picture protective layer.
Especially, the protection layer of the decorative picture in the assembled graphene electrothermal picture faces outwards and faces one side of a user, and the protection layer is used for protecting the patterns on the surface of the decorative picture and preventing the decorative picture base material and the patterns from being damaged in the using process.
Particularly, the method also comprises the step A1) of preparing the infrared absorption-decorative picture, coating infrared absorption slurry on the back of the surface layer decorative picture, then baking, and curing the infrared absorption slurry to form an infrared absorption layer to prepare the infrared absorption-decorative picture; finally, in the assembling process, assembling the infrared absorption-decoration picture, the graphene heating body and the infrared reflection-insulation board by adopting a metal frame from the outside to the inside, and arranging adjacent two layers at intervals to prepare the graphene electric heating picture, wherein an infrared absorption layer of the infrared absorption-decoration picture faces to the graphene heating body; the infrared reflection layer of the infrared reflection-insulation board faces the graphene heating body layer.
The invention provides a preparation method of a graphene electrothermal picture, which comprises the following steps:
a) preparation of graphene heating body layer
a-1) coating graphene heating slurry on the surface of a first insulating plate, and then baking to form a graphene heating film layer on the surface of the insulating plate;
a-2) printing silver paste on the surface of the graphene heating film layer, overlapping the silver paste and the graphene heating film layer into a whole, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-insulating plate;
a-3) coating an adhesive on the surface of a second insulating plate, and performing press-fitting treatment on the adhesive and the silver paste electrode-graphene heating layer-insulating plate prepared in the step 2) to enable the graphene heating film layer to be sandwiched between the two insulating plates to prepare a graphene heating body layer, and meanwhile, reserving a corresponding through hole on a second edge plate corresponding to the position of the silver paste electrode for connecting the silver paste and leading out an external power line;
b) preparation of infrared-enhanced graphene heating body
Coating infrared enhancement slurry on the surface of the insulating plate of the graphene heating body layer, then baking, and curing the infrared enhancement slurry to form an infrared enhancement layer to obtain an infrared enhancement-graphene heating body;
c) assembly
The method comprises the steps of assembling a decorative picture, an infrared enhancement-graphene heating body and a heat insulation board in sequence from the outside to the inside by adopting a metal frame, and arranging adjacent two layers at intervals to obtain the graphene electric heating picture, wherein an infrared enhancement layer of the infrared enhancement-graphene heating body faces towards the decorative picture.
Wherein, the heat insulation board in the step c) is one of a glass magnesium board, a polyurethane heat insulation board and an extruded sheet (XPS), and is preferably a glass magnesium board.
Particularly, in the step a-3), before the pressing treatment, copper sheets with the thickness of 12-500 μm are respectively placed on the surfaces of the silver paste at the positions of the two through holes to serve as connecting terminals, the size of each copper sheet is 3-10mm larger than the diameter of each through hole, and the copper sheets are packaged between the two insulating plates after the pressing treatment.
Particularly, the method also comprises the step b-1) of preparing the infrared absorption-decorative picture, coating infrared absorption slurry on the back surface of the surface layer decorative picture, then baking, and curing the infrared absorption slurry to form an infrared absorption layer to prepare the infrared absorption layer-decorative picture; finally, in the assembling process, assembling the infrared absorption-decoration picture, the infrared enhancement-graphene heating body and the heat insulation board by adopting a metal frame from the outside to the inside, and arranging two adjacent layers at intervals to prepare the graphene electric heating picture, wherein the infrared absorption layer of the infrared absorption-decoration picture faces to the infrared enhancement-graphene heating body; the infrared enhancement layer of the infrared enhancement-graphene heating body faces towards the decorative picture.
In particular, the distance between two adjacent layers in step c) is 3 to 15mm, preferably 5 mm.
The invention further provides a preparation method of the graphene electrothermal picture, which comprises the following steps:
1) preparation of graphene heating body layer
1-1) coating graphene heating slurry on the surface of a first insulating plate, and then baking to form a graphene heating film layer on the surface of the insulating plate;
1-2) printing silver paste on the surface of the graphene heating film layer, overlapping the silver paste and the graphene heating film layer into a whole, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-insulating plate;
1-3) coating an adhesive on the surface of a second insulating plate, and performing press-fitting treatment on the adhesive and the silver paste electrode-graphene heating layer-insulating plate prepared in the step 2) to enable the graphene heating film layer to be sandwiched between the two insulating plates to prepare a graphene heating body layer, and meanwhile, reserving a corresponding through hole on a second edge plate corresponding to the position of the silver paste electrode for connecting the silver paste and leading out an external power line;
2) preparation of infrared absorbing-decorative picture
Coating infrared absorption slurry on the back of the surface layer decorative picture, baking, and curing the infrared absorption slurry to form an infrared absorption layer to obtain an infrared absorption-decorative picture;
3) assembly
The graphene electric heating picture is prepared by assembling the infrared absorption-decoration picture, the graphene heating body and the heat insulation board in sequence from the outside to the inside by adopting a metal frame and arranging the adjacent two layers at intervals, wherein the infrared absorption layer of the infrared absorption-decoration picture faces to the graphene heating body.
The invention provides a graphene heating picture on the other hand, which comprises an electric heating picture main body and a frame for fixing the electric heating picture main body, wherein the electric heating picture main body comprises a surface layer decorative picture, a heating body and a heat insulation layer which are sequentially arranged at intervals, the infrared enhancement layer is arranged on the heating body and used for increasing far infrared emission efficiency of the surface of the heating body, and the infrared enhancement layer faces the surface layer decorative picture.
Compared with a heating body surface packaging material, the infrared enhancement layer material is easier to convert energy into far infrared radiation and emit out the heating body, and has higher infrared conversion efficiency. Therefore, the infrared enhancement layer material is coated on the surface of the heating body, so that the far infrared emission efficiency of the heating body can be improved, and the overall far infrared conversion efficiency of the heating picture is improved.
Wherein, the surface decorative picture, the heating element and the heat-insulating layer are arranged at intervals from front to back in sequence.
In particular, the decorative painting also comprises a decorative protective layer which is arranged on the surface (namely the side facing the user) of the surface decorative painting and is used for protecting the patterns on the surface of the decorative painting and preventing the decorative painting base material and the patterns from being damaged in the using process.
In particular, the decorative and protective layer is a film made of a UV transparent protective material or a plastic film (e.g. PET film, etc.).
When the base material of the decorative painting is high-temperature resistant canvas, a UV transparent protective material can be selected; when the decorative painting base material is a PET film, the protective layer can be a UV transparent protective material or a plastic film.
The UV transparent protective layer is obtained by spraying UV transparent protective paint on the surface of the decorative picture by adopting a spraying method and then carrying out UV irradiation curing; the plastic protective film can be adhered and covered on the surface of the PET decorative picture substrate through the adhesive, so that the decorative patterns and the substrate are protected.
Wherein, the frame of the fixed electric heating picture main body is a metal frame.
In particular, the frame is an aluminum frame or a copper frame, preferably an aluminum frame.
The heating body comprises two insulation plates which are tightly overlapped together and a graphene heating film arranged between the two insulation plates, and a wiring terminal is further arranged at the edge of one side of the graphene heating film and is used for being electrically connected with an external power supply. After the power is switched on, the graphene heating film generates heat and emits infrared rays and heat.
The wiring terminal is electrically connected with an external power supply through a lead. The terminal described in the present invention generally employs a copper terminal known in the art.
Particularly, a temperature controller is further arranged on a lead wire of the wiring terminal, which is electrically connected with an external power supply, and is used for controlling the on-off of the graphene heating layer and the temperature of the graphene heating layer, so that the use safety of the electric heating picture is improved.
The graphene heating film layer in the middle and the insulating material plates positioned on two sides of the heating film layer are sealed through pressing to form the heating body. And the graphene heating body is provided with a wiring terminal for connecting the electric heating picture temperature controller and an external power supply. After the electric wire plug is connected with an external power supply, the graphene heating layer can be controlled to be electrified through the temperature controller, so that far infrared rays are radiated outwards on the surface of the picture through decoration, and meanwhile, the heating power (electric heating picture temperature) of the electric heating picture can be controlled according to requirements.
Particularly, the heating element is rectangular or square.
The graphene heating film layer is a strip-shaped or thin film with a through hole or a strip-shaped through hole in the middle. The graphene heating film is clamped between two layers of glass fiber plates or insulating plates and is fixed by the adhesive when the graphene heating film is superposed into the heating body.
Besides the above strip-shaped or strip-shaped thin film with a through hole or a strip-shaped through hole in the middle, the graphene heating film known in the art is suitable for the present invention.
In particular, the graphene exothermic film refers to a film containing a graphene material, and includes a film layer containing only a single graphene as an exothermic material, and also includes a mixed exothermic material containing a graphene material, that is, the exothermic material contains one or more of carbon nanotubes, graphene, carbon black, graphite powder, metal nanowires, and resin in addition to the graphene.
In particular, the insulating plate is made of a glass fiber plate, a mica plate, a tempered glass or a ceramic plate, preferably a glass fiber plate or a mica plate.
The graphene heating element is prepared by the following method:
A) forming a graphene-containing slurry layer on the surface of the insulating plate by coating or printing the graphene-containing slurry, and then baking to form a graphene film layer;
B) printing silver paste on the surface of the graphene film layer, overlapping the silver paste and the graphene dry film layer, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-glass fiber board;
C) coating an adhesive on the surface of the second insulating plate, and performing press-fitting treatment on the second insulating plate and the silver paste electrode-graphene heating layer-glass fiber plate prepared in the step B), so that the graphene heating film layer is clamped between the two insulating plates, and meanwhile, corresponding via holes are reserved on the insulating plates corresponding to the positions of the silver paste electrodes and used for connecting the silver paste and leading out an external power line.
Wherein the graphene film layer in step A) has a thickness of 10 to 200 μm (preferably 50 μm); the slurry containing the graphene is a slurry containing only a graphene material, or can be a mixed material containing the graphene, and the mixed material further contains one or more of carbon nanotubes, graphite alkyne, carbon black, graphite powder, metal nanowires and resin.
The graphene film can be a film layer made of only graphene materials, or a film layer made of a mixed material containing graphene, wherein the mixed material further contains one or more of carbon nanotubes, graphite alkyne, carbon black, graphite powder, metal nanowires and resin.
The graphene heating film used in the invention can be prepared by coating, screen printing and vapor deposition on the surface of a glass fiber board or an insulating board, and can also be prepared by adopting a graphene heating film disclosed in Chinese patent with the patent number Z L201820042371. X, namely the graphene heating film for the intelligent wearable graphene heating film for clothes, and the graphene heating film is arranged between two glass fiber boards or insulating boards and pressed to form the graphene heating body.
The graphene heating film comprises a base material film, a copper foil circuit board, a graphene film and a protective film which are sequentially overlapped together from bottom to top, and the electric connection points are positioned on two electrodes of the copper foil circuit board. The copper foil circuit board is formed by laminating an ultrathin copper foil on a substrate film and etching a circuit by using a film process, and the two ends of the copper foil circuit board are connected with wiring terminals and are connected with a power supply through a lead so as to work.
In particular, the thickness of the silver colloid dry film in the step B) is 20-30 μm (preferably 25 μm); before the pressing treatment is carried out in the step C), copper sheets with the thickness of 12-500 mu m are respectively placed on the surfaces of the silver pastes at the two through hole positions to serve as wiring terminals, the size of each copper sheet is 3-10mm larger than the diameter of each through hole, and the copper sheets are packaged between two insulating plates after the pressing treatment and used for connecting the silver pastes and leading out an external power line.
The insulating layer is made of a glass fiber-magnesium plate material.
Particularly, the spacing distance between the surface layer decorative picture and the heating body is 3-15mm, preferably 5 mm; the spacing distance between the heating body and the heat-insulating layer is 3-15mm, preferably 5 mm.
The infrared enhancement layer is made of one or more materials of graphite, micro-nano carbon materials, nano silicon powder, metal oxides, silicon oxide, silicon carbide, boron carbide, sodium silicate and aluminum silicate.
Particularly, the micro-nano carbon material is diamond, diamond-like carbon, graphene, graphite alkyne, carbon black or carbon nano tube; the metal oxide is ferric oxide, nickel oxide, chromium oxide, copper oxide, manganese oxide, cobalt oxide or aluminum oxide.
In particular, the infrared enhancement layer is made of silicon carbide, graphene, silicon oxide or graphite.
In particular, the infrared enhancing layer has a thickness of 0.1 to 1000. mu.m, preferably 10 to 300. mu.m, and more preferably 200. mu.m.
Wherein, the infrared enhancement layer is superposed on the surface of the heating element facing to the decorative picture. The infrared enhancement layer is laminated on the surface of the heating body facing one side of the glass fiber board or the insulating board layer of the decorative picture, so that the far infrared emission efficiency of the heating body is enhanced, and the far infrared conversion efficiency of the heating picture is improved.
In particular, the infrared enhancement layer is a thin film layer arranged on the surface of the heating element in one or more modes of printing, spraying, suspension coating, curtain coating, Chemical Vapor Deposition (CVD) method or PVD (evaporation and sputtering).
In particular, the infrared enhancement layer is prepared according to the following method:
a) mixing the infrared enhancement raw material with the adhesive, and uniformly dispersing to prepare enhancement layer slurry;
b) coating the reinforcing layer slurry on the surface of the graphene heating body by adopting a spraying, printing, spin coating, curtain coating or depositing method, then carrying out baking treatment, and curing to form the infrared reinforcing layer.
Wherein, the infrared enhancement raw material in the step a) is selected from one or more of graphite, micro-nano carbon material, nano silicon powder, metal oxide, silicon carbide, boron carbide, sodium silicate and aluminum silicate.
Particularly, the micro-nano carbon material is diamond, diamond-like carbon, graphene, graphite alkyne, carbon black or carbon nano tube; the metal oxide is ferric oxide, nickel oxide, chromium oxide, copper oxide, manganese oxide, cobalt oxide or aluminum oxide.
Particularly, the raw material of the infrared enhancement layer is one or more of silicon carbide, graphene, silicon oxide or graphite.
In particular, the infrared enhancing raw material is selected as a powder having a particle size of 0.1 to 3 μm, preferably 0.1 to 0.5. mu.m.
The adhesive is selected from waterborne epoxy resin, waterborne acrylic resin, vinyl acetate resin, waterborne polyurethane resin, phenolic resin or polyester resin, and is preferably waterborne epoxy resin.
Particularly, the weight ratio of the infrared enhancement raw material to the adhesive is (10-30): (70-90), preferably 20: 80.
In particular, the viscosity of the reinforcement layer slurry is 1000-.
Particularly, the infrared enhancement raw materials comprise silicon oxide and graphite, and the weight ratio of the silicon oxide to the graphite is 1: (0.5-3), preferably 1: 1.
The invention provides a graphene electric heating picture, which comprises an electric heating picture main body and a frame for fixing the electric heating picture main body, wherein the electric heating picture main body comprises a surface layer decorative picture, a heating body and a heat insulation layer which are sequentially arranged at intervals, and the electric heating picture main body also comprises an infrared absorption layer which is arranged on the surface layer decorative picture and is used for absorbing far infrared rays emitted from the heating body and reducing the reflection of the far infrared rays, and the infrared absorption layer faces the heating body.
The infrared absorption layer material can effectively absorb the far infrared rays emitted from the heating body to the decorative picture direction, and reduce the infrared reflectivity. The original decorative picture surface material has infrared reflectivity, can weaken the transfer of energy from the heating element to the decorative picture, reduces the reflection of far infrared rays from the back of the decorative picture back to the heating element, and improves the transfer efficiency of energy from the heating element to the decorative layer.
The infrared absorption layer is made of one or more materials of indium tin oxide, tin antimony oxide, tungsten cesium oxide, tungsten tin oxide, zinc oxide, silicon oxide, aluminum oxide, calcium carbonate, titanium dioxide, wollastonite, silica gel powder, graphite, a micro-nano carbon material, nano silicon powder, melamine, polyphenylene sulfide, boric acid, resin, polyethylene wax, zinc stearate and white oil.
Particularly, the micro-nano carbon material is graphene, graphite alkyne, carbon black or a carbon nano tube; the resin is PP (polypropylene), PET, PC (polychloroprene), ABS (polyacrylonitrile-butadiene-styrene), PMMA (polymethyl methacrylate), PS (polystyrene) or PVC (polyvinyl chloride).
In particular, the infrared absorption layer is made of carbon nanotubes, graphene or zinc oxide material.
In particular, the infrared absorbing layer has a thickness of 0.1 to 1000. mu.m, preferably 50 to 200. mu.m, and more preferably 150. mu.m.
Wherein, the infrared absorption layer is superposed on the surface of the decorative picture facing to the heating element.
Particularly, the infrared absorption layer is a thin film layer arranged on the surface of the decorative picture in one or more modes of printing, spraying, suspension coating, curtain coating, Chemical Vapor Deposition (CVD) method or PVD (evaporation and sputtering).
The infrared absorption layer is prepared by the following method:
i) mixing an infrared absorption raw material with an adhesive, and uniformly dispersing to prepare absorption layer slurry;
and II) coating infrared absorption layer slurry on the back of the surface decorative picture by adopting a spraying, printing, spin coating, curtain coating or depositing method, then carrying out baking treatment, and curing to form the infrared absorption layer.
Wherein, in the step I), the infrared absorption raw material is selected from one or more of indium tin oxide, antimony tin oxide, cesium tungsten oxide, tungsten tin oxide, zinc oxide, silicon oxide, aluminum oxide, calcium carbonate, titanium dioxide, wollastonite, silica gel powder, graphite, a micro-nano carbon material, nano silicon powder, melamine, polyphenylene sulfide, boric acid, resin, polyethylene wax, zinc stearate and white oil.
Particularly, the micro-nano carbon material is graphene, graphite alkyne, carbon black or a carbon nano tube; the resin is PP (polypropylene), PET, PC (polychloroprene), ABS (polyacrylonitrile-butadiene-styrene), PMMA (polymethyl methacrylate), PS (polystyrene) or PVC (polyvinyl chloride).
In particular, the infrared absorption raw material is selected from carbon nano tubes, graphite or zinc oxide.
In particular, the infrared absorbing starting material is selected to be a powder having a particle size of 0.005 to 3 μm, preferably 0.005 to 0.5. mu.m.
The adhesive is selected from waterborne epoxy resin, waterborne acrylic resin, vinyl acetate resin, waterborne polyurethane resin, phenolic resin or polyester resin, and is preferably waterborne epoxy resin.
Particularly, the weight ratio of the infrared absorption raw material to the adhesive is (10-30): (70-90), preferably 15: 85.
In particular, the viscosity of the absorber layer slurry is 500-.
The invention further provides a graphene electric heating picture, which comprises an electric heating picture main body and a frame for fixing the electric heating picture main body, wherein the electric heating picture main body comprises a surface layer decorative picture, a heating body and a heat insulation layer which are sequentially arranged at intervals, and the graphene electric heating picture main body also comprises an infrared reflecting layer arranged on the heat insulation layer and used for reflecting far infrared rays emitted from the heating body to the heat insulation layer and reducing heat transfer from the heating body to the heat insulation layer, and the infrared reflecting layer faces towards the heating body.
The infrared reflection layer can reflect far infrared rays, generally comprises the smooth metal material in surface, and the far infrared rays present the mirror reflection on the surface, and the metal material surface is difficult to absorb the infrared ray to can block that the infrared ray is absorbed and transfer to the heat preservation, reduce the heat from the heat-generating body to the efficiency of heat preservation transfer, promote the directional energy transfer efficiency who decorates the drawing direction of heat-generating body.
Wherein, the infrared reflecting layer is a film layer made of one or more materials of aluminum, silver, copper, Polyethylene (PE), glass fiber and PET.
In particular, the thickness of the infrared reflecting layer is 0.1 to 1000. mu.m, preferably 10 to 200. mu.m, and more preferably 100. mu.m.
The infrared reflecting layer is superposed on the surface of the side, facing the heating body, of the heat insulating layer.
Particularly, the infrared reflecting layer is a thin film layer arranged on the surface of the heat preservation layer in one or more modes of printing, spraying, suspension coating, curtain coating, Chemical Vapor Deposition (CVD) method or PVD (evaporation and sputtering).
The invention further provides a graphene electric heating picture, which comprises an electric heating picture main body and a frame for fixing the electric heating picture main body, wherein the electric heating picture main body comprises a surface layer decorative picture, a heating body and a heat preservation layer which are sequentially arranged at intervals, and further comprises an infrared enhancement layer and an infrared absorption layer, wherein: the infrared enhancement layer is arranged on the heating body, faces the surface layer decorative picture and is used for increasing far infrared emission efficiency of the surface of the heating body; the infrared absorption layer is arranged on the surface layer decorative picture and faces the heating body and is used for absorbing far infrared rays emitted from the heating body and reducing reflection of the far infrared rays.
The invention provides a graphene electric heating picture on the other hand, which comprises an electric heating picture main body and a frame for fixing the electric heating picture main body, wherein the electric heating picture main body comprises a surface layer decorative picture, a heating body and a heat insulation layer which are sequentially arranged at intervals, and further comprises an infrared enhancement layer and an infrared reflection layer, wherein: the infrared enhancement layer is arranged on the heating body, faces the surface layer decorative picture and is used for increasing far infrared emission efficiency of the surface of the heating body; the infrared reflection layer is arranged on the heat preservation layer and faces the heating body, and is used for reflecting far infrared rays emitted from the heating body to the heat preservation layer and reducing heat transfer from the heating body to the heat preservation layer.
The invention further provides a graphene electric heating picture, which comprises an electric heating picture main body and a frame for fixing the electric heating picture main body, wherein the electric heating picture main body comprises a surface layer decorative picture, a heating body and a heat insulation layer which are sequentially arranged at intervals, and further comprises an infrared absorption layer and an infrared reflection layer, wherein the infrared absorption layer is arranged on the surface layer decorative picture, faces the heating body, and is used for absorbing far infrared rays emitted from the heating body and reducing reflection of the far infrared rays; the infrared reflection layer is arranged on the heat preservation layer and faces the heating body, and is used for reflecting far infrared rays emitted from the heating body to the heat preservation layer and reducing heat transfer from the heating body to the heat preservation layer.
The invention also provides a graphene electric heating picture, which comprises an electric heating picture main body and a frame for fixing the electric heating picture main body, wherein the electric heating picture main body comprises a surface decorative picture, a heating body and a heat preservation layer which are sequentially arranged at intervals, and further comprises an infrared enhancement layer, an infrared absorption layer and an infrared reflection layer, wherein: the infrared enhancement layer is arranged on the heating body, faces the surface layer decorative picture and is used for increasing far infrared emission efficiency of the surface of the heating body; the infrared absorption layer is arranged on the surface decorative picture, faces the heating body, and is used for absorbing far infrared rays emitted from the heating body and reducing reflection of the far infrared rays; the infrared reflection layer is arranged on the heat preservation layer and faces the heating body, and is used for reflecting far infrared rays emitted from the heating body to the heat preservation layer and reducing heat transfer from the heating body to the heat preservation layer.
Compared with the prior art, the invention has the following advantages and benefits:
the invention aims to solve the problem of low normal direction electric-thermal radiation efficiency of the existing graphene electric heating picture, adopts a method of respectively adding an infrared absorption layer and an infrared emission layer on a decorative layer and a heating body layer of the electric heating picture, and achieves the following effects:
the method for adding the far infrared absorption layer on the inner surface of the electric heating picture decoration layer and adding the infrared radiation enhancement layer on the side of the heating body pointing to the electric heating picture decoration layer improves the efficiency of transferring infrared radiation energy from the heating body to the electric heating picture decoration layer, thereby improving the far infrared radiation efficiency of the electric heating picture and improving the heating and far infrared physiotherapy effects of the heating picture.
According to the invention, the infrared absorption layer is added on the inner surface of the electric heating picture decoration layer, and the far infrared emission enhancement layer is arranged on the surface of the heating body layer, which is directed to the decoration layer, so that the energy transfer efficiency between the heating body and the decoration layer is increased, and the forward electric heating radiation efficiency of the electric heating picture is effectively improved. The positive electric-thermal radiation efficiency of the electric heating picture is increased, the human body temperature feeling at a longer distance is improved, and the human body far infrared physiotherapy experience is improved; and because the positive electricity-heat radiation efficiency of the electric heating picture is increased, the heating effect of the electric heating picture is improved, and the energy utilization efficiency is improved.
Drawings
Fig. 1 is a schematic cross-sectional view of a conventional graphene electrothermal picture;
FIG. 2 is a schematic cross-sectional structure view of a first embodiment of the graphene electrothermal picture according to the present invention;
FIG. 3 is a schematic cross-sectional structure view of a second embodiment of the graphene electrothermal picture according to the present invention;
FIG. 4 is a schematic cross-sectional structure view of a third embodiment of the graphene electrothermal picture according to the present invention;
FIG. 5 is a schematic cross-sectional structure view of a fourth embodiment of the graphene electrothermal picture according to the present invention;
FIG. 6 is a schematic cross-sectional structure view of a fifth embodiment of the graphene electrothermal picture according to the present invention;
fig. 7 is a schematic cross-sectional structure view of a sixth embodiment of the graphene electrothermal picture according to the present invention.
Description of the reference numerals
1. Electric heating decorative pictures (pattern layers); 2. a decorative painting protective layer; 3. a graphene heating body layer; 4. an infrared reflecting layer; 5. a heat-insulating layer; 6. fixing the frame; 7. an infrared absorbing layer; 8. an infrared enhancement layer.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
As shown in fig. 2, the graphene electrothermal picture of the present invention includes an electrothermal picture main body and a frame 6 for fixing the electrothermal picture main body, wherein the electrothermal picture main body includes a surface decoration picture 1, a graphene heating element layer 3 and a heat insulation layer 5 which are sequentially arranged from outside to inside at intervals, the decoration picture, the heating element layer and the heat insulation layer are spaced at a certain distance, and the spacing distance between two adjacent layers is 3-15mm (preferably 5mm), wherein: the outer surface (i.e. the side facing the user of the electric heating picture) of the surface layer decorative picture is provided with a decorative picture protective layer 2, and the inner surface facing the heating body is provided with an infrared absorption layer 7; an infrared enhancement layer 8 is arranged on the surface of one side of the heating body layer facing the decorative picture; an infrared reflecting layer 4 is arranged on the surface of one side of the heat preservation layer facing the heating body.
In the description of the present invention, it should be noted that the terms "table", "inside", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and the like indicate the orientation or positional relationship shown when the user of the graphene electro-thermal drawing faces the electro-thermal drawing, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
The fixing frame 6 for fixing the electric heating picture main body is made of metal material aluminum with good heat conducting property, namely an aluminum frame, and other metal frames with good heat conducting property except the aluminum frame are suitable for the electric heating picture main body.
The surface decorative painting 1 is made of high-temperature resistant materials; such as landscape, character or landscape; but also a photograph or other decorative picture.
The decorative painting 1 is made of high-temperature-resistant canvas or PET (polyethylene terephthalate) base materials, and decorative painting patterns are sprayed and painted on the surface of the base materials through a UV (ultraviolet) spray painting machine. Surface finishes known in the art are suitable for use in the present invention.
The decorative painting protective layer 2 is a film or a plastic film made of a UV transparent protective material and arranged on the outer surface (namely, the side facing a user) of the decorative painting, covers the outer surface of the decorative painting, and is used for protecting the patterns on the surface of the decorative painting and preventing the decorative painting base material and the patterns from being damaged in the using process.
When the base material of the decorative painting is high-temperature resistant canvas, a UV transparent protective material can be selected; when the decorative painting base material is a PET film, the protective layer can be a UV transparent protective material or a plastic film. The UV transparent protective layer is obtained by spraying UV transparent protective paint on the surface of the decorative picture by adopting a spraying method and then carrying out UV irradiation curing; the plastic protective film can be adhered and covered on the surface of the PET decorative picture substrate through the adhesive, so that the decorative patterns and the substrate are protected.
The infrared absorption layer 7 is a thin layer with a thickness of 0.1-1000 μm (preferably 50-200 μm; more preferably 150 μm) coated on the back surface (i.e. the side away from the user and the inner surface) of the decorative picture by coating, printing, vapor deposition (chemical vapor deposition CVD, physical vapor deposition PVD, PVD may be vapor deposition or sputter coating), and is used for absorbing the far infrared rays emitted from the heating element, reducing the reflection of the far infrared rays from the back surface of the decorative picture back to the heating element, and improving the transfer efficiency of energy from the heating element to the decorative layer.
The infrared absorption layer is made of one or more materials of raw materials of indium tin oxide, tin antimony oxide, tungsten cesium oxide, tungsten tin oxide, zinc oxide, silicon oxide, aluminum oxide, calcium carbonate, titanium dioxide, wollastonite, silica gel powder, graphite, a micro-nano carbon material, nano silicon powder, melamine, polyphenylene sulfide, boric acid, resin, polyethylene wax, zinc stearate and white oil.
The micro-nano carbon material is graphene, graphite alkyne, carbon black or a carbon nano tube; the resin is PP (polypropylene), PET, PC (polychloroprene), ABS (polyacrylonitrile-butadiene-styrene), PMMA (polymethyl methacrylate), PS (polystyrene) or PVC (polyvinyl chloride).
The infrared absorbing layer in the present invention is preferably a thin layer made of carbon nanotube, graphene or zinc oxide material.
The graphene heating body layer 3 is an energy core source of the electric heating picture, and is used for generating heat and far infrared rays, and consists of two insulating plates (such as a glass fiber plate, a mica plate and the like) and a graphene heating film which are tightly overlapped together, the graphene heating film layer is clamped between the two insulating plates, a wiring terminal (not shown in the figure) which is used for being electrically connected with an external power supply is further arranged at the edge of the graphene heating film, the wiring terminal is electrically connected with the external power supply through a lead (not shown in the figure), and a temperature controller (not shown in the figure) is further arranged on the lead. The power on-off of the graphene heating layer and the temperature of the graphene heating layer are controlled through the temperature controller, the use safety of the electric heating picture is improved, and after the electric heating picture is powered on, the graphene heating film generates heat and emits infrared rays and heat.
The graphene heating element is prepared by the following method:
A) forming a graphene-containing slurry layer on the surface of the insulating plate by coating or printing the graphene-containing slurry, and then baking to form a graphene film layer;
B) printing silver paste on the surface of the graphene film layer, overlapping the silver paste and the graphene dry film layer, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-glass fiber board;
C) coating an adhesive on the surface of the second insulating plate, performing press-fit treatment on the second insulating plate and the silver paste electrode-graphene heating layer-glass fiber plate prepared in the step B), reserving corresponding via holes on the insulating plate corresponding to the positions of the silver paste electrodes, placing a copper sheet with the thickness of 12-500 mu m on the surfaces of the silver pastes at the two via holes respectively as a wiring terminal before press-fit, wherein the size of the copper sheet is 3-10mm larger than the diameter of the via hole, and packaging the copper sheet between the two insulating plates after press-fit for connecting the silver paste and leading out an external power line.
The thickness of the graphene film layer is 10 to 200 μm (preferably 50 μm). The graphene film can be a film layer made of only graphene materials, or a film layer made of a mixed material containing graphene, wherein the mixed material further contains one or more of carbon nanotubes, graphite alkyne, carbon black, graphite powder, metal nanowires and resin.
The graphene heating film used in the invention can be prepared by coating, screen printing and vapor deposition on the surface of an insulating plate, and can also be prepared by adopting a graphene heating film disclosed in Chinese patent with the patent number Z L201820042371. X, namely the graphene heating film for the intelligent wearable garment, and the graphene heating film is arranged between two glass fiber plates or insulating plates and is pressed to form the graphene heating body.
The graphene heating film comprises a base material film, a copper foil circuit board, a graphene film and a protective film which are sequentially overlapped together from bottom to top, and the electric connection points are positioned on two electrodes of the copper foil circuit board. The copper foil circuit board is formed by laminating an ultrathin copper foil on a substrate film and etching a circuit by using a film process, and the two ends of the copper foil circuit board are connected with wiring terminals and are connected with a power supply through a lead so as to work.
The infrared reinforcing layer 8 is formed by coating, printing, or vapor deposition (chemical vapor deposition CVD or physical vapor deposition PVD) a thin layer having a thickness of 0.1 to 1000 μm (preferably 10 to 300 μm, and more preferably 200 μm) on the surface of the graphene heat-generating layer facing the surface decorative picture (i.e., on the surface of the glass fiber board or the insulating board facing the decorative picture). The infrared enhancement layer is made of one or more of graphite, micro-nano carbon materials, nano silicon powder, metal oxides, silicon oxide, silicon carbide, boron carbide, sodium silicate or aluminum silicate, and has the functions of increasing the far infrared emission efficiency of the surface of the heating body and improving the overall far infrared conversion efficiency of the heating picture.
The micro-nano carbon material is diamond, diamond-like carbon, graphene, graphite alkyne, carbon black or carbon nano tube; the metal oxide is ferric oxide, nickel oxide, chromium oxide, copper oxide, manganese oxide, cobalt oxide or aluminum oxide.
The infrared enhancement layer is made of silicon carbide, graphene, silicon oxide or graphite into a thin layer.
The heat-insulating layer 5 is a glass magnesium board layer and is made of glass magnesium board materials.
The infrared reflecting layer 4 is formed by covering a thin layer with the thickness of 0.1-1000 microns (preferably 100 microns) on the surface of the side, facing the graphene heating element, of the heat insulation layer in a coating, printing and vapor deposition (chemical vapor deposition (CVD) or Physical Vapor Deposition (PVD) mode, the infrared reflecting layer 4 is made of one or more materials of aluminum, silver, copper, Polyethylene (PE), glass fiber and polyethylene terephthalate (PET), and is used for reflecting far infrared rays emitted from the heating element to the heat insulation layer, weakening the efficiency of energy transfer from the heating element to the heat insulation layer and improving the energy transfer efficiency of the heating element in the direction of the decorative picture.
As shown in fig. 3, another embodiment structure of the graphene electrothermal picture of the present invention includes an electrothermal picture main body and a frame 6 for fixing the electrothermal picture main body, wherein the electrothermal picture main body includes a surface decoration picture 1, a graphene heating element layer 3, and an insulating layer 5, which are sequentially arranged from outside to inside at intervals, wherein the decoration picture, the heating element layer, and the insulating layer are spaced at a certain distance, and the spacing distance between two adjacent layers is 3-15mm (preferably 5mm), wherein: the outer surface (i.e. the side facing the user of the electric heating picture) of the surface layer decorative picture is provided with a decorative picture protective layer 2, and the inner surface facing the heating body is provided with an infrared absorption layer 7.
As shown in fig. 4, the third embodiment structure of the graphene electrothermal painting of the present invention includes an electrothermal painting main body and a frame 6 for fixing the electrothermal painting main body, wherein the electrothermal painting main body includes a surface decoration painting 1, a graphene heating body layer 3, and an insulating layer 5, which are sequentially arranged from outside to inside at intervals, wherein the decoration painting, the heating body layer, and the insulating layer are spaced at a certain distance, and the spacing distance between two adjacent layers is 3-15mm (preferably 5mm), wherein: the outer surface (i.e. the side facing the user of the electric heating picture) of the surface layer decorative picture is provided with a decorative picture protective layer 2; an infrared reinforcing layer 8 is provided on the surface of the heat-generating body layer on the side facing the decorative picture.
As shown in fig. 5, the fourth embodiment structure of the graphene electrothermal painting of the present invention includes an electrothermal painting main body and a frame 6 for fixing the electrothermal painting main body, wherein the electrothermal painting main body includes a surface decoration painting 1, a graphene heating element layer 3, and an insulating layer 5, which are sequentially arranged from outside to inside at intervals, wherein the decoration painting, the heating element layer, and the insulating layer are spaced at a certain distance, and the spacing distance between two adjacent layers is 3-15mm (preferably 5mm), wherein: the outer surface (i.e. the side facing the user of the electric heating picture) of the surface layer decorative picture is provided with a decorative picture protective layer 2, and the inner surface facing the heating body is provided with an infrared absorption layer 7; an infrared reflecting layer 4 is arranged on the surface of one side of the heat preservation layer facing the heating body.
As shown in fig. 6, the fifth implementation structure of the graphene electrothermal painting of the present invention includes an electrothermal painting main body and a frame 6 for fixing the electrothermal painting main body, wherein the electrothermal painting main body includes a surface decoration painting 1, a graphene heating layer 3, and an insulating layer 5, which are sequentially arranged from outside to inside at intervals, wherein the decoration painting, the heating layer, and the insulating layer are spaced at a certain distance, and the spacing distance between two adjacent layers is 3-15mm (preferably 5mm), wherein: the outer surface (i.e. the side facing the user of the electric heating picture) of the surface layer decorative picture is provided with a decorative picture protective layer 2, and the inner surface facing the heating body is provided with an infrared absorption layer 7; an infrared reinforcing layer 8 is provided on the surface of the heat-generating body layer on the side facing the decorative picture.
As shown in fig. 7, the sixth implementation structure of the graphene electrothermal painting of the present invention includes an electrothermal painting main body and a frame 6 for fixing the electrothermal painting main body, wherein the electrothermal painting main body includes a surface decoration painting 1, a graphene heating layer 3, and an insulating layer 5, which are sequentially arranged from outside to inside at intervals, wherein the decoration painting, the heating layer, and the insulating layer are spaced at a certain distance, and the spacing distance between two adjacent layers is 3-15mm (preferably 5mm), wherein: the outer surface (i.e. the side facing the user of the electric heating picture) of the surface layer decorative picture is provided with a decorative picture protective layer 2; an infrared enhancement layer 8 is arranged on the surface of one side of the heating body layer facing the decorative picture; an infrared reflecting layer 4 is arranged on the surface of one side of the heat preservation layer facing the heating body.
Example 1
1. Preparation of graphene heating element
1. Preparation of graphene heating element
1-1) printing graphene slurry on the surface of a glass fiber board with electrical insulation property by a screen printing method, printing a graphene layer on the surface of the glass fiber board, and baking the graphene layer at 150 ℃ for 60min to form a graphene dry film thin layer with the thickness of 50 micrometers (usually 10-200 micrometers);
the graphene slurry is prepared by mixing graphene and an auxiliary additive consisting of acrylic resin, NMP, ethyl cellulose and PVP, wherein the graphene: the mass ratio of the auxiliary agent is 100:60 (usually 100 (10-80)), wherein the mass ratio of the acrylic resin, NMP, ethylcellulose and PVP in the auxiliary agent is 100: 80: 2: 1 (generally 100 (10-90): (0.5-5): 0.5-5).
In addition to the graphene slurry in the embodiment of the invention, other graphene heating slurries known in the prior art are all suitable for the invention; in addition to screen printing, other materials such as coating are also suitable for use in the present invention.
1-2) printing a silver paste electrode on a glass fiber plate, overlapping the silver paste electrode with a graphene dry film layer to form good electric connection, after silver paste printing, baking at 150 ℃ for 60min to form a dry film, wherein the thickness of the film is 25 micrometers (usually 20-30 micrometers), and preparing the silver paste electrode-graphene heating layer-glass fiber plate;
1-3) coating a layer of epoxy resin (adhesive) on the surface of a second glass fiber board, and laminating with the prepared silver paste electrode-graphene heating layer-glass fiber board prepared in the step 1-2), wherein the laminating temperature is 180 ℃ and 60min, meanwhile, corresponding via holes are reserved on the glass fiber board corresponding to the positions of the silver paste electrodes, before laminating, a copper sheet with the thickness of 50 micrometers is respectively placed on the surfaces of the silver pastes at the two via hole positions to serve as a wiring terminal, the peripheral size of the copper sheet is larger than the diameter of the via hole by 8mm (generally 3-10mm), and after laminating, the copper sheet is packaged between two insulating boards to be used for connecting the silver paste and leading out an external power line.
And 1-4) connecting an external power line (connecting a temperature controller and a socket) with a copper sheet wiring terminal in a welding mode through a via hole, and carrying out insulation treatment on the via hole through insulation mud or insulation glue. The heating body finally comprises two layers of glass fiber plates, a graphene heating layer, a silver paste electrode and a copper terminal electrode, and the total thickness is 3 mm.
The graphene heating element provided by the invention is a heating element containing a graphene material, and comprises a heating element only containing graphene as a heating film layer material, and also comprises a mixed heating element containing the graphene material, namely the heating element contains one or more of carbon nano tubes, graphite alkyne, carbon black, graphite powder, metal nano wires and resin besides the graphene material.
2. Preparation of an Infrared enhancement layer
2-1) preparing slurry for enhancing layer
Mixing infrared enhanced raw material silicon carbide powder and adhesive water-based epoxy resin, stirring and dispersing uniformly to prepare enhanced layer slurry with the viscosity of 2500cps (usually 1000-10000cps), wherein the weight part ratio of the silicon carbide to the adhesive is 20:80 (usually 10-30:70-90), and the particle size of the silicon carbide powder is 0.1-3 μm, preferably 0.1-0.5 μm.
Raw materials of the infrared enhancement layer slurry are other than silicon carbide, and one or more of graphite, micro-nano carbon material, nano silicon powder, metal oxide, silicon carbide, boron carbide, sodium silicate, aluminum silicate, diamond-like carbon, graphene, graphite alkyne, carbon black, carbon nanotube, iron oxide, nickel oxide, chromium oxide, copper oxide, manganese oxide, cobalt oxide or aluminum oxide are suitable for the invention.
In the embodiments of the present invention, silicon carbide is taken as an example, and other materials such as graphene, silicon oxide or graphite are all suitable for the present invention.
2-2) coating treatment
Spraying infrared enhancement layer slurry on the side of the graphene heating body layer facing the surface layer decorative picture, then baking for 30min (usually 20-40min) at the temperature of 150 ℃ (usually 120-160 ℃), and curing the slurry to form an infrared enhancement layer with the thickness of 200 μm (usually 0.1-1000 μm, preferably 10-300 μm).
In the embodiment of the present invention, the infrared enhancement layer is prepared by spraying, and besides the spraying, other methods in the art, such as printing, spin coating, curtain coating, deposition, etc., are all suitable for preparing the infrared enhancement layer.
3. Preparation of an Infrared absorbing layer
Preparing a carbon nano tube coating on the back surface of the base material of the manufactured decorative picture, namely the side facing the graphene heating body, in a coating mode; after curing, an infrared absorption layer is formed and attached to the back surface of the base material of the decorative picture, and the thickness of the infrared absorption layer is 100 μm (usually 0.1-1000 μm);
3-1) preparing slurry of an absorption layer
3-1) preparing slurry of an absorption layer
Mixing infrared absorption raw material carbon nanotube powder and adhesive water-based acrylic resin, stirring and dispersing uniformly to prepare reinforcing layer slurry with the viscosity of 1500cps (usually 500-5000cps), wherein the weight part ratio of the carbon nanotube to the adhesive is 15:85 (usually 10-30:70-90), the diameter of the carbon nanotube is 0.005-0.05 μm, and the length of the carbon nanotube is 5-20 μm.
3-2) coating treatment
Spraying infrared absorption layer slurry on the back surface (i.e. the side facing the graphene heating body layer) of the surface layer decorative picture, then baking for 40min (usually 20-40min) at 130 ℃ (usually 120-.
In the embodiment of the present invention, the infrared absorption layer is prepared by spraying, and besides the spraying, other methods in the art, such as printing, spin coating, curtain coating, deposition, etc., are all suitable for preparing the infrared absorption layer.
4. Preparing decorative picture protective layer
The surface of the surface decorative picture coated with the infrared absorption layer (i.e. the side facing the user) is covered with a PET film by an adhesive to form a decorative picture protective layer 2.
Besides adopting the adhesive to cover the PET film on the surface of the decorative picture, the invention can also directly spray the curing type UV gloss oil on the surface of the decorative picture, and form the protective layer of the decorative picture through UV light irradiation and curing.
5. Preparation of the reflective layer
And covering a pure aluminum foil film on the surface of the heat-preservation layer glass magnesium board through an adhesive to form an infrared reflecting layer 4, wherein the thickness of the aluminum foil is 100 mu m.
In the embodiments of the present invention, the aluminum film layer is taken as an example for illustration, and other film layers made of one or more materials such as silver, copper, Polyethylene (PE), glass fiber, and PET are suitable for use as the infrared reflecting layer of the present invention.
In addition, in the present embodiment, the reflective layer is prepared by directly bonding the aluminum thin film by using an adhesive, and the aluminum thin film layer (i.e. the infrared reflective layer 4) with a thickness of 100 μm (usually 0.1 to 1000 μm, preferably 10 to 200 μm) can also be prepared on the surface of the insulating layer glass magnesium plate by one or more of printing, spraying, suspension coating, curtain coating, Chemical Vapor Deposition (CVD) method or PVD (evaporation, sputtering).
6. Assembly
The decorative picture (comprising a protective layer and an infrared absorption layer), the heating body (comprising an infrared enhancement layer) and the heat preservation layer (comprising a reflection layer) of the electric heating picture are assembled in sequence by adopting an aluminum alloy frame to form a complete electric heating picture structure, the total thickness of the electric heating picture is about 1cm, wherein the decorative picture layer, the graphene heating body layer and the heat preservation layer are arranged at intervals, and the distance between every two adjacent layers is 5mm (usually 3-15 mm).
The binding post of the heat-generating body of electric heat picture passes through the wire and sets up external temperature controller, wire socket electricity on the wire and is connected, after the switch on, generates heat through temperature controller control heat-generating body, and graphite alkene heat-generating body launches far infrared to both sides, and reflection stratum and heat preservation ensure that the heat is mainly preserved in heat-generating body and decoration picture one side. And the silicon carbide infrared enhancement layer and the carbon nano tube infrared absorption layer can transfer energy from the heating body to the decoration layer more efficiently, and effectively improve the working efficiency (electricity-heat radiation efficiency) of the electric heating picture.
Example 2
1. Preparation of graphene heating element
The same as example 1 was repeated, except that the graphene paste was coated on the mica substrate by coating to prepare a graphene heating element and form a heating element layer;
2. preparation of an Infrared enhancement layer
Same as in example 1.
3. Preparation of an Infrared absorbing layer
Same as in example 1.
4. Preparing decorative picture protective layer
Same as in example 1.
5. Preparation of the Infrared reflecting layer
The same procedure as in example 1 was repeated, except that a reflecting film of aluminum foil laminate (or a flexible aluminum foil, a heat-resistant PE adhesive, PET, or glass fiber laminate) was used.
6. Assembly
Same as in example 1.
Example 3
1. Preparation of graphene heating element
Same as in example 1.
2. Preparation of an Infrared enhancement layer
2-1) preparing slurry for enhancing layer
Mixing infrared enhancement raw materials, namely silicon oxide powder, graphite powder and adhesive water-based epoxy resin, uniformly stirring and dispersing to prepare enhancement layer slurry with the viscosity of 2500cps (usually 1000-10000cps), wherein the weight ratio of the infrared enhancement raw materials to the adhesive is 20:80 (usually 10-30:70-90), the weight ratio of the silicon oxide to the graphite is 1:1 (usually 1 (0.5-3)), and the particle diameters of the silicon oxide powder and the graphite powder are 0.1-3 μm, preferably 0.1-0.5 μm.
2-2) coating treatment
The same procedure as in step 2-2) of example 1 was repeated, except that the infrared enhancing layer slurry was silicon oxide, graphite and an aqueous epoxy resin.
3. Preparation of an Infrared absorbing layer
Preparing a graphene coating on the back surface of the base material of the manufactured decorative picture, namely the side facing the graphene heating body, in a coating manner; after curing, an infrared absorption layer is formed and attached to the back surface of the base material of the decorative picture, and the thickness of the infrared absorption layer is 100 μm (usually 0.1-1000 μm);
3-1) preparing slurry of an absorption layer
The same as in example 1 was conducted except that the infrared absorbing raw material was graphene powder, wherein the particle size of the graphene powder was 0.5 to 3 μm, preferably 0.5 to 1 μm.
3-2) coating treatment
The procedure was carried out in the same manner as in step 3-2) of example 1 except that the spin coating was carried out.
4. Preparing decorative picture protective layer
Same as in example 1.
5. Preparation of the Infrared reflecting layer
Same as in example 1.
6. Assembly
Same as in example 1.
Example 4
1. Preparation of graphene heating element
The same procedure as in example 1 was repeated, except that a graphene paste was applied to a mica substrate to prepare a graphene heating element and form a heating element layer;
2. preparation of an Infrared enhancement layer
Coating a silicon oxide-graphite infrared enhancement layer on one side, facing the electric heating picture decoration layer, of the graphene heating body layer;
2-1) preparing slurry for enhancing layer
Mixing infrared enhancement raw materials, namely silicon oxide powder, graphite powder and adhesive water-based epoxy resin, uniformly stirring and dispersing to prepare enhancement layer slurry with the viscosity of 2500cps (usually 1000-10000cps), wherein the weight ratio of the infrared enhancement raw materials to the adhesive is 20:80 (usually 10-30:70-90), the weight ratio of the silicon oxide to the graphite is 1:1 (usually 1 (0.5-3)), and the particle diameters of the silicon oxide powder and the graphite powder are 0.1-3 μm, preferably 0.1-0.5 μm.
2-2) coating treatment
The same procedure as in step 2-2) of example 1 was repeated, except that the infrared reinforcing layer slurry was prepared by using silicon oxide, graphite and aqueous epoxy resin and by flow coating.
3. Preparation of an Infrared absorbing layer
Preparing a graphene coating on the back surface of the base material of the manufactured decorative picture, namely the side facing the graphene heating body, in a coating manner; after curing, an infrared absorption layer is formed and attached to the back surface of the base material of the decorative picture, and the thickness of the infrared absorption layer is 100 μm (usually 0.1-1000 μm);
3-1) preparing slurry of an absorption layer
Mixing infrared absorption raw material graphene powder and adhesive aqueous acrylic resin, stirring and uniformly dispersing to prepare reinforcing layer slurry with the viscosity of 1500cps (usually 500-5000cps), wherein the weight part ratio of the graphene to the adhesive is 20:80 (usually 10-30:70-90), and the particle size of the graphene powder is 0.5-3 μm, preferably 0.5-1 μm.
3-2) coating treatment
Same as in example 1.
4. Preparing decorative picture protective layer
And spraying curing type UV gloss oil on the surface of the decorative picture, and irradiating and curing by UV light to form a decorative picture protective layer.
5. Preparation of the Infrared reflecting layer
Same as in example 1.
6. Assembly
Same as in example 1.
Comparative example 1
The procedure of example 1 was repeated, except that the infrared absorbing layer and the infrared reinforcing layer were not prepared, that is, the electric heating paintings did not have the infrared absorbing layer and the infrared reinforcing layer.
Comparative example 2
The same as example 1 was repeated except that the infrared absorbing layer, the infrared enhancing layer and the infrared reflecting layer were not formed, that is, the electric heating paintings did not have the infrared absorbing layer, the infrared enhancing layer and the infrared reflecting layer.
Comparative example 3
The procedure of example 1 was repeated except that the infrared absorbing layer and the infrared reinforcing layer were not prepared, that is, the electric heating paintings did not have the infrared absorbing layer and the infrared reinforcing layer, and the infrared reflecting layer was a composite aluminum foil reflecting layer.
Test example 1
The electric-thermal radiation related performance of the electric heating paintings prepared in the examples 1-4 and the comparative examples 1-3 of the invention was tested by using an electric-thermal radiation conversion efficiency test method in the national standard GB/T7287-.
Table 1 test results of electric-thermal radiation conversion efficiency of electric heating picture
| Electric-thermal radiation conversion efficiency | Electric-thermal radiation conversion efficiency | ||
| Example 1 | 80％ | Comparative example 1 | 65％ |
| Example 2 | 78％ | Comparative example 2 | 60％ |
| Example 3 | 75％ | Comparative example 3 | 63％ |
| Example 4 | 76％ | - | - |
The electric-thermal conversion efficiency of the electric heating picture is obviously higher than that of the comparative example, namely the electric heating picture has advantages in various performances such as energy conservation, heating effect, far infrared physiotherapy and the like.
The graphene electric heating picture has the key point that an efficient energy transfer path is obtained by respectively arranging an infrared enhancement layer and an infrared absorption layer on the surface of a heating body layer in the electric heating picture and the back of a decorative picture, so that the graphene electric heating picture has higher working efficiency and has more advantages in heating and far infrared health care.
The above-described embodiments of the present invention are merely exemplary and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of a graphene electrothermal picture is characterized by comprising the following steps:
A) preparation of graphene heating body layer
A-1) coating graphene heating slurry on the surface of a first insulating plate, and then baking to form a graphene heating film layer on the surface of the insulating plate;
a-2) printing silver paste on the surface of the graphene heating film layer, overlapping the silver paste and the graphene heating film layer into a whole, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-insulating plate;
a-3) coating an adhesive on the surface of a second insulating plate, and performing press-fitting treatment on the adhesive and the silver paste electrode-graphene heating layer-insulating plate prepared in the step 2) to enable the graphene heating film layer to be sandwiched between the two insulating plates to prepare a graphene heating body layer, and meanwhile, reserving a corresponding through hole on a second edge plate corresponding to the position of the silver paste electrode for connecting the silver paste and leading out an external power line;
B) preparation of infrared reflection-insulation board
Covering an infrared reflecting layer on the surface of one side of the heat-insulating plate by means of bonding, coating, printing or vapor deposition, wherein the infrared reflecting layer is an aluminum, silver, copper, polyethylene, glass fiber or PET film, and preparing the infrared reflecting-heat-insulating plate;
C) assembly
The method comprises the steps of assembling a decorative picture, a graphene heating body and an infrared reflection-insulation board in sequence from the outside to the inside by adopting a metal frame, and arranging adjacent two layers at intervals to obtain the graphene electric heating picture, wherein an infrared reflection layer of the infrared reflection-insulation board faces towards a graphene heating body layer.
2. The method according to claim 1, further comprising a step a-4) of preparing an infrared-enhanced graphene heating element, coating an infrared-enhanced slurry on the surface of the insulating plate of the graphene heating element layer, and then performing a baking process, wherein the infrared-enhanced slurry is cured to form an infrared-enhanced layer, thereby preparing the infrared-enhanced graphene heating element; finally, in the assembling process, assembling the decorative picture, the infrared enhancement-graphene heating element and the infrared reflection-insulation board by adopting a metal frame from the outside to the inside, and arranging adjacent two layers at intervals to prepare the graphene electric heating picture, wherein the infrared enhancement layer of the infrared enhancement-graphene heating element faces towards the decorative picture; the infrared reflection layer of the infrared reflection-insulation board faces the infrared enhancement-graphene heating body layer.
3. The method according to claim 2, further comprising the steps of a-5) preparing an infrared absorption-decorative picture, coating an infrared absorption slurry on the back surface of the surface layer decorative picture, baking, and curing the infrared absorption slurry to form an infrared absorption layer to obtain the infrared absorption layer-decorative picture; finally, in the assembling process, assembling the infrared absorption-decoration picture, the infrared enhancement-graphene heating element and the infrared reflection-insulation board by adopting a metal frame in sequence from the outside to the inside, and arranging adjacent two layers at intervals to prepare the graphene electric heating picture, wherein an infrared absorption layer of the infrared absorption-decoration picture faces towards the infrared enhancement-graphene heating element; the infrared enhancement layer of the infrared enhancement-graphene heating body faces towards the decorative picture; the infrared reflection layer of the infrared reflection-insulation board faces the infrared enhancement-graphene heating body layer.
4. The method for preparing the decoration picture according to claim 1, further comprising the steps of A1) preparing an infrared absorption-decoration picture, coating infrared absorption slurry on the back of the surface layer decoration picture, and then carrying out baking treatment, wherein the infrared absorption slurry is solidified to form an infrared absorption layer, so as to prepare the infrared absorption-decoration picture; finally, in the assembling process, assembling the infrared absorption-decoration picture, the graphene heating body and the infrared reflection-insulation board by adopting a metal frame from the outside to the inside, and arranging adjacent two layers at intervals to prepare the graphene electric heating picture, wherein an infrared absorption layer of the infrared absorption-decoration picture faces to the graphene heating body; the infrared reflection layer of the infrared reflection-insulation board faces the graphene heating body layer.
5. A preparation method of a graphene electrothermal picture is characterized by comprising the following steps:
a) preparation of graphene heating body layer
a-1) coating graphene heating slurry on the surface of a first insulating plate, and then baking to form a graphene heating film layer on the surface of the insulating plate;
a-2) printing silver paste on the surface of the graphene heating film layer, overlapping the silver paste and the graphene heating film layer into a whole, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-insulating plate;
a-3) coating an adhesive on the surface of a second insulating plate, and performing press-fitting treatment on the adhesive and the silver paste electrode-graphene heating layer-insulating plate prepared in the step 2) to enable the graphene heating film layer to be sandwiched between the two insulating plates to prepare a graphene heating body layer, and meanwhile, reserving a corresponding through hole on a second edge plate corresponding to the position of the silver paste electrode for connecting the silver paste and leading out an external power line;
b) preparation of infrared-enhanced graphene heating body
Coating infrared enhancement slurry on the surface of the insulating plate of the graphene heating body layer, then baking, and curing the infrared enhancement slurry to form an infrared enhancement layer to obtain an infrared enhancement-graphene heating body;
c) assembly
The method comprises the steps of assembling a decorative picture, an infrared enhancement-graphene heating body and a heat insulation board in sequence from the outside to the inside by adopting a metal frame, and arranging adjacent two layers at intervals to obtain the graphene electric heating picture, wherein an infrared enhancement layer of the infrared enhancement-graphene heating body faces towards the decorative picture.
6. The method according to claim 5, further comprising the steps of b-1) preparing an infrared absorption-decorative picture, coating an infrared absorption slurry on the back surface of the surface layer decorative picture, baking, and curing the infrared absorption slurry to form an infrared absorption layer to obtain the infrared absorption layer-decorative picture; finally, in the assembling process, assembling the infrared absorption-decoration picture, the infrared enhancement-graphene heating body and the heat insulation board in sequence from the outside to the inside by adopting a metal frame, and arranging adjacent two layers at intervals to prepare the graphene electric heating picture, wherein the infrared absorption layer of the infrared absorption-decoration picture faces the infrared enhancement-graphene heating body; the infrared enhancement layer of the infrared enhancement-graphene heating body faces towards the decorative picture.
7. A preparation method of a graphene electrothermal picture is characterized by comprising the following steps:
1) preparation of graphene heating body layer
1-1) coating graphene heating slurry on the surface of a first insulating plate, and then baking to form a graphene heating film layer on the surface of the insulating plate;
1-2) printing silver paste on the surface of the graphene heating film layer, overlapping the silver paste and the graphene heating film layer into a whole, and then baking to form a silver paste dry film to prepare a silver paste electrode-graphene heating layer-insulating plate;
1-3) coating an adhesive on the surface of a second insulating plate, and performing press-fitting treatment on the adhesive and the silver paste electrode-graphene heating layer-insulating plate prepared in the step 2) to enable the graphene heating film layer to be sandwiched between the two insulating plates to prepare a graphene heating body layer, and meanwhile, reserving a corresponding through hole on a second edge plate corresponding to the position of the silver paste electrode for connecting the silver paste and leading out an external power line;
2) preparation of infrared absorbing-decorative picture
Coating infrared absorption slurry on the back of the surface layer decorative picture, baking, and curing the infrared absorption slurry to form an infrared absorption layer to obtain an infrared absorption-decorative picture;
3) assembly
The graphene electric heating picture is prepared by assembling the infrared absorption-decoration picture, the graphene heating body and the heat insulation board in sequence from the outside to the inside by adopting a metal frame and arranging the adjacent two layers at intervals, wherein the infrared absorption layer of the infrared absorption-decoration picture faces to the graphene heating body.
8. The preparation method of claim 2, 3, 5 or 6, wherein the infrared enhancement slurry comprises an infrared enhancement material and a binder, wherein the weight ratio of the infrared enhancement material to the binder is (10-30): (70-90), preferably 20: 80.
9. The method according to claim 8, wherein the infrared enhancing material is one or more of graphite, micro-nano carbon material, nano silicon powder, metal oxide, silicon carbide, boron carbide, sodium silicate and aluminum silicate.
10. The preparation method according to claim 3, 4, 6 or 7, wherein the infrared absorption slurry comprises an infrared absorption material and a binder, wherein the weight ratio of the infrared absorption material to the binder is (10-30): (70-90), preferably 15: 85.
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