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Electric-heating film, preparation method and application thereof

An electric heating film and thin film technology, applied in the direction of electric heating devices, ohmic resistance heating, ohmic resistance heating parts, etc., can solve the problems of PET protective film peeling, resin aging, deformation that cannot be stretched or shrunk in three-dimensional curved surface dimensions, etc. Achieve good heating effect

Active Publication Date: 2019-01-22
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The electrothermal film in the prior art can only be bent and cannot be deformed
That is to say, the existing electrothermal film can only be deformed on a two-dimensional plane, and cannot be deformed on a three-dimensional curved surface or deformed by stretching or shrinking its size.
The PET protective film softens at a temperature of about 180°C, and the resin in the heat-generating layer undergoes significant aging, making the internal heat-generating layer in a non-viscous flow state, resulting in the peeling of the PET protective film, resulting in obvious defects

Method used

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  • Electric-heating film, preparation method and application thereof
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  • Electric-heating film, preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] The preparation method of electrothermal film, comprises the steps:

[0050] (1) Forming a film on the surface of the base material with conductive ink to prepare the heating layer 120 . The heating layer 120 is formed by forming a film on the surface of the base material by using a conductive ink composed of a low-temperature softening resin and a conductive filler. The substrate is one or a combination of films, plates and fabrics. The substrate may also be the first protective layer 110 or the second protective layer 130 or other film-forming substrates.

[0051] Optionally, the heating layer 120 is formed by forming a film on the surface of the substrate at one time by using conductive ink. The film formation can be carried out by one or more of printing, coating and spraying, and the heat generating layer 120 is made by printing, coating and spraying conductive ink on the surface of the substrate.

[0052] (2) Coating metal paste on the surface of the heating la...

Embodiment 1

[0058] Conductive ink containing epoxy resin with a softening temperature of 70-100°C (for example: 70°C, 90°C or 100°C) is used as raw material, wherein the mass percentage of epoxy resin in non-volatile components is 40%. As the first protective layer 110 and the second protective layer 130 , a POFC film that undergoes abnormal deformation at a temperature of 70-100° C. (for example: 70° C., 90° C. or 100° C.) is used.

[0059] A cylindrical coating roller is used to coat the conductive ink on the POFC film, and the heating layer 120 is formed after drying. Metal paste is used to form bus bars on the surface of the heating layer 120, and the two sides of the heating layer 120 are hot-pressed and laminated with POFC film. After hot-pressing and compounding, the production of the electrothermal film product is completed. Wherein, the temperature of the thermocompression lamination is 60°C, and the pressure is 0.2Mpa.

[0060] The electrothermal film is wrapped on the surface ...

Embodiment 2

[0062] As the first protective layer 110 and the second protective layer 130 , PET films that undergo special-shaped deformation under the condition of 100-120° C. (for example: 100° C., 110° C. or 120° C.) are used.

[0063] A cylindrical coating roller is used to coat common conductive ink on the PET film, and the heating layer 120 is formed after drying. Metal paste is used to form bus bars on the surface of the heating layer 120, and the two sides of the heating layer 120 are cold-pressed and laminated with PET film. After cold-pressing and laminating, the production of the electrothermal film product is completed. Among them, the pressure of cold pressing is 0.8Mpa.

[0064] The electrothermal film is wrapped on the surface of the valve. It is observed that after the electrothermal film is heated, the shrinkage rate reaches 15%, and it is completely attached to the surface of the valve. The heating effect is good, but cracks, faults and peel off.

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Abstract

The invention provides an electrothermal film, a preparation method and application thereof, which belongs to the technical field of electrothermal films, a preparation method and an application thereof. The electrothermal film comprises a first protective layer, a heat generating layer and a second protective layer, wherein the heat generating layer is sandwiched between the first protective layer and the second protective layer, and the first protective layer and the second protective layer are made of a pre-stretched film. A method for preparing an electrothermal film comprises combining afirst protective layer and a second protective layer made of a pre-stretched film on both sides of a heating layer. The electric heating film manufactured by the preparation method is heated, the first protective layer and the second protective layer can be deformed on a three-dimensional curved surface, and can be used more closely with an article to be heated, and the heating effect is better. The electric heating film is characterized in that the first protective layer and the second protective layer are deformed on a three-dimensional curved surface.

Description

technical field [0001] The invention relates to the technical field of electrothermal film, in particular, to an electrothermal film, its preparation method and application. Background technique [0002] The current electric heating film is an electric heating film prepared by coating a conductive paste on the surface of a resin film such as PET, drying and forming, and adding electrodes on both sides of the conductive film. Its structure mainly has three layers from top to bottom: PET protective film, heating layer, PET protective film. Because it has a certain flexibility and can be bent, it is often used in flat or two-dimensional curved surface heating applications such as floor heating, heating murals, heating writing pads, and wearable clothing. [0003] The electrothermal film in the prior art can only be bent and cannot be deformed. That is to say, the existing electrothermal film can only deform on a two-dimensional plane, and cannot perform non-planar deformation...

Claims

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Application Information

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IPC IPC(8): H05B3/34H05B3/14H05B3/02H05B3/18
CPCH05B3/02H05B3/145H05B3/18H05B3/34
Inventor 吴祯琪刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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