Flexible metal-based graphene electrothermal material and preparation method thereof

Abstract

The invention relates to the technical field of electric heating materials, in particular to a flexible metal-based graphene electric heating material and a preparation method thereof. A flexible metal-based graphene electric heating material comprises a flexible insulating layer, a flexible graphene resistance layer, a flexible insulating layer and a metal substrate which are sequentially arranged from top to bottom, rolled copper foil is further arranged between the flexible graphene resistance layer and the flexible insulating layer, and the electric heating material is a bendable flexible material. And the electric heating material can be bent inwards by taking the metal substrate as the outermost layer until the electric heating material is completely overlapped. The preparation method of the flexible metal-based graphene electric heating material is used for producing the flexible metal-based graphene electric heating material and comprises the following steps: S1, performing prepreg forming; S2, manufacturing a printing sheet; S3, carrying out silk-screen manufacturing; S4, carrying out the overlapping. The invention provides a flexible metal-based graphene electrothermal material which can be bent and flexed and is stable in electrical property and a preparation method thereof.

Description

technical field [0001] The invention relates to the technical field of electrothermal materials, in particular to a flexible metal-based graphene electrothermal material and a preparation method thereof. Background technique [0002] At present, graphene electrothermal materials can be divided into graphene electrothermal substrates in various forms such as graphene electrothermal plates, graphene electrothermal films, and graphene electrothermal cloths. Among them, the graphene electric heating plate and the graphene electric heating film are coated with graphene slurry on the substrate (such as FR-4 insulating sheet, glass, PET, PI, etc.) by screen printing, gravure printing, etc. , and then cured at high temperature to form a thick film resistor, so as to realize the current heating effect, such as figure 1 As shown, after AC or DC current passes through the graphene thick film resistor, Joule heat will be generated. [0003] Graphene electric heating plates / films began...

AI Technical Summary

Problems solved by technology

[0005] 1. The product is based on non-metallic manufacturing, with low thermal conductivity and low heat dissipation coefficient, resulting in uneven product temperature, slow heat transfer and heat dissipation, and limited application scenarios. The highest power density of the current product is 1000w / ㎡

[0006] 2. The product itself is not strong enough, and its basic characteristics are similar to those of conventional plastic panels. It cannot be bent in small arcs, and cannot maintain the bent shape after bending, which is not conducive to product design and shape.

[0007] 3. The conventional graphene slurry is brittle after solidification and does not have the flexibility of multiple bending. After multiple bending or flexing, the graphene slurry will crack, and the local resistance will be too large after electrification, which will cause local burning burning phenomenon, resulting in fire risk

[0008] 4. Conventional electrodes cannot follow the bending, and it is easy to cause the risk of detachment and delamination from the insulating layer after bending, and the conventional copper foil does not have ductility, and it is easy to break after bending with a small arc

However, conventional graphene heating plates are not flexible

[0012] The traditional graphene electric heating plate can achieve a stable structure in the plane, but it is not suitable for bending and flexing. First, because of the reason of the insulating layer substrate, it is easy to break after bending or flexing, and it cannot maintain the bending and bending. The deflected shape will rebound to a flat shape; the second is that the graphene resistance layer formed by the traditional graphene paste cured at high temperature cannot withstand small arc bending, and small arc bending will cause the graphene resistance layer to be broken. , this will cause a great hidden danger, that is, the local resistance is too large, and the heat will be concentrated here after power-on, which will cause burning; the third is that the electrodes of the traditional graphene electric heating plate are made of electrolytic copper foil, which has no ductility , cannot withstand the tensile stress of bending, and the copper foil is easy to break after bending

Based on the above reasons, it can be seen that the traditional graphene electric heating plate cannot be bent or flexed, not to mention that it can be shaped according to the curved surface

[0013] At the same time, the heat transfer and heat dissipation of the traditional graphene electric heating plate are slow, because the insulating layer is generally a polymer material with large thermal resistance and low thermal conductivity, which is not conducive to quickly exporting the heat of the graphene resistance layer and dissipating it as soon as possible. Will greatly reduce the life of the graphene electric heating plate and is not conducive to improving the power density of the graphene electric heating plate

[0014] Therefore, it can only be used for planar structures at present, and cannot be used for structures with curved surfaces. A flexible metal-based graphene electric heating plate is developed to make up for the shortcomings of graphene electric heating plates that cannot be shaped, and to fill the gap in this subdivision field. especially important

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