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An electric heating film, its preparation method and electric heating product

A technology of electric heating film and heating layer, which is applied in the direction of electric heating devices, ohmic resistance heating, ohmic resistance heating parts, etc., to achieve the effect of prolonging service life and stabilizing heat generation

Active Publication Date: 2021-08-13
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By increasing the composite pressure, there will still be gaps between the heating layer and the copper foil strip and between the heating layer and the protective layer, which cannot effectively solve the above problems

Method used

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  • An electric heating film, its preparation method and electric heating product
  • An electric heating film, its preparation method and electric heating product
  • An electric heating film, its preparation method and electric heating product

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] The preparation method of electrothermal film, comprises the steps:

[0049] (1) Forming a film on the surface of the base material with conductive ink to prepare the heat generating layer 130 . The heating layer 130 is made by forming a film on the surface of the substrate using a conductive ink made 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 120 or other film-forming substrates.

[0050] Optionally, the heating layer 130 is formed by forming a film on the surface of the base material at one time by using conductive ink. Avoid using multiple coatings or multi-layer stacking to achieve different thicknesses of the heating area 131 and the confluence area 132, and can make the continuous transition between the heating area 131 and the confluence area 132, so that the heating of the heating film i...

Embodiment 1

[0060] The conductive ink containing epoxy resin with a softening temperature of 70-80°C (for example: 70°C, 75°C or 80°C) is used as raw material, wherein the mass percentage of epoxy resin in non-volatile components is 20%.

[0061] Cylindrical coating rollers with different meshes are used to coat the epoxy resin substrate, and after drying, a heat generating layer 130 with a three-dimensional structure is formed. Wherein, on the coating roller, the mesh in the heating zone 131 is a shallow hole of 250 meshes, the confluence region 132 is a deep hole of 100 meshes, and the junction area transitions gradually with a gradient of 30 meshes / 100 microns. A 1 cm wide section in the middle of the applicator roll junction 132 used 150 mesh orifices.

[0062] The produced heat generating layer 130 has a continuous planar structure. see figure 1 According to the test, the thickness of the heating area 131 is 5 microns, the thickness of the confluence area 132 is 50 microns, and the...

Embodiment 2

[0065] Use conductive inks containing ethylene-vinyl acetate copolymer resins with a softening temperature of 80-100°C (for example: 80°C, 85°C or 100°C) as raw materials, of which ethylene-vinyl acetate copolymer resins account for the total non-volatile components 40%.

[0066] Gravure printing rolls with different meshes are used to coat the PET film, and after drying, a heat generating layer 130 with a three-dimensional structure is formed. Wherein, the mesh in the heating zone 131 on the coating roller is a 200-mesh shallow hole, the confluence zone 132 is a 100-mesh deep hole, and the junction area transitions gradually with a gradient of 20 mesh / 100 microns. A 1 cm wide portion in the middle of the confluence region 132 of the gravure roll used 150 mesh holes.

[0067] The produced heat generating layer 130 has a striped structure. see figure 2 According to tests, the thickness of the heating zone 131 is 10 microns, the thickness of the confluence zone 132 is 35 mic...

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Abstract

The invention provides an electric heating film, its preparation method and electric heating product, belonging to the technical field of electric heating film. The electrothermal film includes a first protective layer, a heating layer and a second protective layer. Two bus bars are respectively arranged at both ends of the heating layer. The heating layer is sandwiched between the first protective layer and the second protective layer. The heating layer is made of conductive ink. The conductive ink comprises low-temperature softening resin and conductive filler, wherein the softening temperature of the low-temperature softening resin is 70-150°C. The preparation method comprises the following steps: using conductive ink to form a film on the surface of the base material to prepare a heating layer. The first protective layer and the second protective layer are respectively compounded on both sides of the heat generating layer so that the heat generating layer is sandwiched between the first protective layer and the second protective layer. The internal gap of the electrothermal film prepared by the preparation method is reduced or even has no gap, and the obtained electrothermal product generates more stable heat.

Description

technical field [0001] The present invention relates to the technical field of electric heating film, in particular, to an electric heating film, its preparation method and electric heating product. Background technique [0002] People are constantly pursuing a higher quality of life. With the improvement of people's living standards, not only are products required to meet basic functions, but they are also required to be more efficient, more environmentally friendly, more stable and safer. Compared with the traditional inefficient, polluting, and unsafe combustion heating, electric heating has the characteristics of high efficiency, environmental protection, and safety, and has gradually become popular in recent years. There are many types of electric heating heating products, among which the popularity of electric heating film is getting faster and faster. [0003] Conventional electric heating film is mainly divided into three layers: upper protective layer, heating laye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/14H05B3/02H05B3/34
CPCH05B3/02H05B3/145H05B3/34
Inventor 吴祯琪刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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