阅读说明：本技术 一种可水洗柔性石墨烯低压电热膜及其制备方法 (Washable flexible graphene low-voltage electrothermal film and preparation method thereof ) 是由 吴越 于 2018-08-01 设计创作，主要内容包括：本发明公开了一种可水洗柔性石墨烯低压电热膜以及制备方法,所述电热膜包括从上至下依次设置的上封装层、覆膜层、石墨烯导电油墨层、导电银浆层、印刷基材层和下封装层；或者包括从上至下依次设置的上封装层、覆膜层、导电银浆层、石墨烯导电油墨层、印刷基材层和下封装层；所述电热膜还包括设置在导电银浆层的电极接线部位的导电胶片及导线。本发明的加热膜具有可随意弯折的优点,搓洗、机洗后功率无明显衰减；同时,经远红外中心检测加热膜呈均匀面状发热,均匀辐射6-14μm远红外线,符合人体保暖、理疗、医械等需求。(The invention discloses a washable flexible graphene low-voltage electrothermal film and a preparation method thereof, wherein the electrothermal film comprises an upper packaging layer, a film covering layer, a graphene conductive ink layer, a conductive silver paste layer, a printing substrate layer and a lower packaging layer which are sequentially arranged from top to bottom; or comprises an upper packaging layer, a film coating layer, a conductive silver paste layer, a graphene conductive ink layer, a printing substrate layer and a lower packaging layer which are arranged in sequence from top to bottom; the electric heating film also comprises a conductive film and a lead which are arranged at the electrode wiring part of the conductive silver paste layer. The heating film has the advantage of being capable of being bent at will, and the power is not obviously attenuated after scrubbing and machine washing; meanwhile, the heating film is uniformly heated in a surface form through the detection of a far infrared center, and the far infrared rays with the size of 6-14 microns are uniformly radiated, so that the requirements of human body heat preservation, physical therapy, medical instruments and the like are met.)

1. A washable flexible graphene low-voltage electrothermal film is characterized by comprising an upper packaging layer, a film covering layer, a graphene conductive ink layer, a conductive silver paste layer, a printing substrate layer and a lower packaging layer which are sequentially arranged from top to bottom;

or comprises an upper packaging layer, a film coating layer, a conductive silver paste layer, a graphene conductive ink layer, a printing substrate layer and a lower packaging layer which are arranged in sequence from top to bottom;

the electric heating film also comprises a conductive film and a lead which are arranged at the electrode wiring part of the conductive silver paste layer.

2. The washable flexible graphene low-voltage electrothermal film according to claim 1, wherein the conductive silver paste layer is printed on the upper surface of the printing substrate layer, and the graphene conductive ink layer is printed on the upper surface of the conductive silver paste layer;

or the graphene conductive ink layer is printed on the upper surface of the printing substrate layer, and the conductive silver paste layer is printed on the upper surface of the graphene conductive ink layer.

3. The washable flexible graphene low-voltage electrothermal film according to claim 1, wherein the thickness of the printed substrate layer is 0.0125-0.1 mm.

4. The washable flexible graphene low-voltage electrothermal film according to claim 1, wherein the material of the conductive film is selected from any one of aluminum foil, copper foil, gold/silver coating and copper-nickel coating double cloth.

5. The washable flexible graphene low-voltage electrothermal film according to claim 1, wherein the coating layer is selected from any one of polyimide films and polyester films.

6. The washable flexible graphene low-voltage electrothermal film according to claim 1, wherein the material of the upper packaging layer is selected from any one of polyurethane film and waterproof cloth; the material of the lower packaging layer is selected from any one of polyurethane film and waterproof cloth.

7. A preparation method of the washable flexible graphene low-voltage electrothermal film according to any one of claims 1 to 6, wherein the method comprises the following steps:

the method comprises the following steps: selecting a suitable printing substrate;

step two: preparing ink;

step three: sequentially printing a conductive silver paste layer and a graphene conductive ink layer on the upper surface of the printing substrate layer by using a female die or a net die, and baking and curing;

step four: attaching a conductive film to the electrode wiring part of the conductive silver paste layer;

step five: performing roller hot-pressing on the upper surface of the graphene conductive ink layer to form a film coating layer, and connecting the film coating layer with a wire;

step six: and respectively covering the upper surface and the lower surface of the inner membrane after wiring with an encapsulation layer, and performing hot pressing treatment by using a flat plate hot press.

8. The preparation method of the washable flexible graphene low-voltage electrothermal film according to claim 7, wherein the step five is specifically as follows: carrying out roller hot-pressing film coating on the upper surface of the graphene conductive ink layer, and then sequentially placing a rivet, a wire with a wiring terminal and the printed and coated inner film on a riveting machine for positioning and riveting;

or after punching a hole at a wiring part on the film, performing roller hot-pressing film covering on the upper surface of the graphene conductive ink layer, and welding a wire on the conductive film at a hole opening part after film covering.

9. The preparation method of the washable flexible graphene low-voltage electrothermal film according to claim 8, wherein waterproof insulating protective paint is sprayed or spot-coated on the exposed metal or lead at the wiring position.

10. The preparation method of the washable flexible graphene low-voltage electrothermal film according to claim 9, wherein the material of the waterproof insulating protective paint is selected from any one of silicon-based, epoxy-based, acrylic and polyurethane materials.

Technical Field

The invention relates to the technical field of electrothermal films, in particular to a washable flexible graphene low-voltage electrothermal film and a preparation method thereof.

Background

The existing production process of the flexible heating film mainly comprises a metal wire winding heating film, a metal sheet corrosion heating film, a carbon fiber winding heating film, a carbon fiber felt heating film and a common graphene heating film. The existing carbon fiber, metal wire and metal sheet heating film can cause local resistance to be enlarged after being bent for many times to cause circuit breaking, or the conductor is contacted with the heating film to cause short circuit, so that the temperature is too low or too high to cause the local burning through of the heating film, fire, scald, electric leakage and other potential safety hazards. The carbon fiber felt heating film needs to be pasted with double-conductive copper foils as electrodes, the copper foils shrink after long-time heating to cause poor contact, the resistance change is large, and ignition is easy.

The resistance change of a common graphene heating film is obvious after the common graphene heating film is kneaded, and the product can be irreversibly power-attenuated after the common graphene heating film is sewn into a clothing finished product and is washed by a machine.

Disclosure of Invention

The invention aims to provide a washable flexible graphene low-voltage electrothermal film, which is used for solving the problems of uneven heating, poor durability and incapability of scrubbing of the conventional heating film.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a washable flexible graphene low-voltage electrothermal film comprises an upper packaging layer, a film covering layer, a graphene conductive ink layer, a conductive silver paste layer, a printing substrate layer and a lower packaging layer which are sequentially arranged from top to bottom;

or comprises an upper packaging layer, a film coating layer, a conductive silver paste layer, a graphene conductive ink layer, a printing substrate layer and a lower packaging layer which are arranged in sequence from top to bottom;

the electric heating film also comprises a conductive film and a lead which are arranged at the electrode wiring part of the conductive silver paste layer.

As a preferable scheme, the conductive silver paste layer is printed on the upper surface of the printing substrate layer, and the graphene conductive ink layer is printed on the upper surface of the conductive silver paste layer;

or the graphene conductive ink layer is printed on the upper surface of the printing substrate layer, and the conductive silver paste layer is printed on the upper surface of the graphene conductive ink layer.

Because the upper and lower two sides of conductive silver thick liquid layer and the graphite alkene conductive ink layer all can electrically conduct, the last finished product effect is not influenced to graphite alkene conductive ink layer and conductive silver thick liquid layer's upper and lower order during actual printing.

As a preferable scheme, the thickness of the printing substrate layer is 0.0125-0.1 mm. The printing substrate layer is a flexible insulating material and has the following conditions: flexibility, weather resistance (high/low temperature resistance), flexibility resistance (difficult deformation), high voltage breakdown resistance (good electrical insulation), tearing and impact resistance (high strength), fire resistance (no combustion supporting in case of open fire), and moisture resistance (difficult oxidation of a printing layer).

Preferably, the material of the conductive film is selected from any one of aluminum foil, copper foil, gold/silver coating and copper-nickel coating double cloth.

In a preferred embodiment, the coating layer is selected from any one of a polyimide film and a polyester film.

As a preferable scheme, the material of the upper packaging layer is selected from any one of a polyurethane film and a waterproof cloth; the material of the lower packaging layer is selected from any one of polyurethane film and waterproof cloth.

The second purpose of the invention is to provide a preparation method of the washable flexible graphene low-voltage electrothermal film, which comprises the following steps:

the method comprises the following steps: selecting a suitable printing substrate;

step two: preparing ink;

step three: sequentially printing a conductive silver paste layer and a graphene conductive ink layer on the upper surface of the printing substrate layer by using a female die or a net die, and baking and curing;

step four: attaching a conductive film to the electrode wiring part of the conductive silver paste layer;

step five: performing roller hot-pressing on the upper surface of the graphene conductive ink layer to form a film coating layer, and connecting the film coating layer with a wire;

step six: and respectively covering the upper surface and the lower surface of the inner membrane after wiring with an encapsulation layer, and performing hot pressing treatment by using a flat plate hot press.

As a preferred scheme, the step five is specifically as follows: carrying out roller hot-pressing film coating on the upper surface of the graphene conductive ink layer, and then sequentially placing a rivet, a wire with a wiring terminal and the printed and coated inner film on a riveting machine for positioning and riveting;

or after punching a hole at a wiring part on the film, performing roller hot-pressing film covering on the upper surface of the graphene conductive ink layer, and welding a wire on the conductive film at a hole opening part after film covering.

Preferably, waterproof insulating protective paint is sprayed or spot-coated on the exposed part of the metal or the lead at the wiring part.

Preferably, the protective paint is waterproof and insulating, and the material of the waterproof insulating protective paint is selected from any one of silicon-based, epoxy-based, acrylic and polyurethane materials.

The principle of the washable flexible graphene low-voltage electrothermal film heating provided by the invention is as follows: after the power is switched on, current is evenly led into the graphene conductive ink layer after being shunted by the silver paste layer, carbon atoms in the graphene conductive ink layer generate Brownian motion, electric energy is converted into internal energy, and therefore the purpose of heating is achieved.

The invention has the following advantages:

the graphene heating film provided by the invention totally comprises 6 layers (not containing glue layers and wires) of materials, and the thickness of the graphene heating film is pressed to 0.15-0.25mm, so that the layers are compounded into a whole at high temperature and high pressure; the heating film is internally provided with a high-strength base material, and is externally provided with a buffer layer with good flexibility, and the buffer layer is waterproof and insulating, so that various potential safety hazards are avoided. Tests show that finished clothes, shoes, hats and protective clothing which are manufactured after secondary processing can be washed by a water washing machine, the heating rate is high, the temperature is uniform, the temperature power is not obviously attenuated after long-term use, the material is non-toxic and environment-friendly, and the low pressure is safer. The low-temperature low-voltage electrothermal film is used as a new product in the market, the national standard is not available temporarily, the quality of the technical product is obviously improved compared with that of the product in the prior art in the market, and the disorder of the industry is changed.

The heating film produced by the process has the advantage of being capable of being bent at will, the power is not obviously attenuated after rubbing and washing and machine washing, the heating film is in a uniform surface heating state through the detection of a far infrared center, and the far infrared rays with the size of 6-14 microns are uniformly radiated, so that the heating film meets the requirements of human body heat preservation, physical therapy, medical equipment and the like.

Drawings

Fig. 1 is a schematic structural diagram of the washable flexible graphene low-voltage electrothermal film disclosed by the invention.

The packaging structure comprises a substrate layer, a conductive silver paste layer, a graphene conductive ink layer, a conductive film layer, a film covering layer, a packaging layer, a wire and a substrate layer, wherein the substrate layer is printed 1, the conductive silver paste layer is printed 2, the graphene conductive ink layer is printed 3, the conductive film layer is printed 4, the film covering layer is printed 5, the packaging layer is printed 6, the packaging layer is printed 7, the.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.