Low-voltage flexible electrothermal film and preparation method therefor

Abstract

The invention discloses a low-voltage flexible electrothermal film and a preparation method therefor. The electrothermal film comprises an insulating base material, an electrode layer, a conductive heating layer, a heat conducting and infrared radiation layer and an externally connected wire; each layer is formed by printing, and drying is completed in a drying channel; and the electrothermal filmis applicable to electrothermal clothes. The low-voltage flexible electrothermal film has the advantages as follows: large-area heating at a low voltage (3.7V) can be realized; the heat conducting and radiation layer is adopted to replace an insulation protection layer above the existing heating layer; the layer also has the insulation protection, heat conducting and infrared radiation functions;by adopting the multi-point externally connected wire mode to replace the existing method for improving conductivity of an external electrode, basically same voltages in each point on the external electrode is realized, so that cost is lowered, and meanwhile, electrode flexibility and stability are reinforced; and a mature printing mode is adopted to manufacture the electrothermal film to replacethe existing troublesome, time-consuming and strict working procedure, so that the technical threshold for manufacturing the low-voltage flexible electrothermal film is lowered, thereby facilitatinglarge-scale industrial production of the electrothermal film.

Description

technical field [0001] The invention relates to a low-voltage flexible electric heating film and a preparation method thereof. The electric heating film is used for heating clothing and the like. Background technique [0002] Current heating clothing, such as cotton coats, down jackets, leather jackets, waist protectors, knee pads, neck protectors, insoles, eye masks, etc., are mostly made of insulating materials such as cotton and fur, which do not have the function of heating , to meet the needs of keeping warm by reducing heat loss. However, the warming effect of these clothes is not ideal when the outside temperature is low. In order to achieve the necessary warming effect, it is often realized by increasing the amount of clothing, which is inconsistent with the pursuit of people's pursuit of light clothing; However, the health care effect on the body that can be achieved only by heat preservation is very limited, and people need clothing and health care products that c...

AI Technical Summary

Problems solved by technology

However, the warming effect of these clothes is not ideal when the outside temperature is low. In order to achieve the necessary warming effect, it is often realized by increasing the amount of clothing, which is inconsistent with the pursuit of people's pursuit of light clothing; , the health effects on the body that can be achieved only through heat preservation are very limited. People need clothing and health care products that can heat themselves, especially for the elderly.

[0003] At present, in order to realize the heat generation of heating clothing, the usual method is to place an electric heating film in the clothing, but at present, whether it is for the resistance wire electric heating film or the common way of adding electrodes at both ends of the electric heating film, high voltage is required to achieve the necessary Obviously, this is unsafe, and there is a danger of leakage

[0004] In order to avoid the danger of electric leakage, it is necessary to use thicker insulating materials on both sides of the electrothermal film. Even if low-voltage heating is realized, as in the patent CN 104883760 A, a better heating effect can be achieved within the safe voltage, but the materials used are difficult The preparation is expensive, the preparation process is complicated, and special equipment is required, which will inevitably lead to problems of low yield rate, high production cost, difficulty in large-scale production, and difficult to obtain good market response

[0005] At present, thicker insulating materials are used on both sides of the electric heating film, which brings about a problem that the heat conduction and infrared radiation effect of the electric heating film facing the human body is greatly reduced. At the same time, the thickness of the entire electric heating film increases and the flexibility becomes poor. , placed inside the electric heating clothing will bring discomfort to the user, and even affect the appearance of the clothing

[0006] In order to achieve the effect of low voltage (≤12V) without affecting the heating effect, it is often necessary to use external electrodes and internal electrodes to achieve it. Patent CN 105433464 A In order to achieve a small change in voltage at any position on any external electrode, the required The silver content in the silver paste is very high or the silver filler with better conductivity is used, which will not only greatly increase the cost of making the electric heating film, but also increase the brittleness of the outer electrode. In the heating clothing, the electric heating film is often subject to frequent bending. In the case of folding, it is easy to cause the resistance of the current-carrying bar to increase, and even the occurrence of an open circuit

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