Medium and low temperature electrothermal film of inorganic non-metallic material and preparation method thereof

Abstract

The invention provides an inorganic non-metallic material medium and low temperature electrothermal film which comprises a substrate layer, a heating layer arranged on the substrate layer, a conductive electrode arranged on the heating layer and an insulating layer covering the heating layer, the heating layer is an inorganic non-metallic material film, and the resistivity of the inorganic non-metallic material film is 10 <-3 > omega.m to 10 <-6 > omega.m. The invention also provides a preparation method. The invention is applied to the 220V civil voltage heating film.

Description

technical field [0001] The invention belongs to the technical field of heating, and in particular relates to a medium and low temperature electric heating film of inorganic non-metallic materials and a preparation method thereof. Background technique [0002] At present, there are many kinds of electric heating film materials on the market, which are mainly divided into three categories: the first is the polymer material electric heating film; the second is the metal-based electric heating film; the third is the inorganic non-metallic material electric heating film. [0003] The representative of the polymer material electric heating film is the carbon-based printing ink type electric heating film. The main problems of these electric heating films are: waste liquid, waste gas, etc. are generated in the process, which is not conducive to environmental protection; the polymer organic matter has attenuation problems, especially the temperature After more than 50 ℃, the power at...

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Problems solved by technology

[0003] The representative of polymer material electric heating film is carbon-based printing ink type electric heating film. The main problems of these electric heating films are: waste liquid, waste gas, etc. are generated during the process, which is not conducive to environmental protection; polymer organic matter has attenuation problems, especially temperature After exceeding 50°C, the power attenuation will increase sharply, resulting in a sharp decrease in its life; the resistivity is high, reaching 10 -2 Ω.m, according to the square resistance r=resistivity / film thickness=ρ / d, the corresponding square resistance is high, then the corresponding volume resistance R=electrode distance*square resistance / electrode length=w*r / l, the corresponding volume The resistance is also high, so it needs to increase its film thickness to reduce the bulk resistance, but in this way, it is necessary to coat a film thickness of several μm

The metal-based electric heating film has good electrical conductivity (the metal resistivity is low, reaching 10 -8 Ω.m, according to square resistance r=resistivity / film thickness=ρ / d, the corresponding square resistance is low, then the corresponding volume resistance R=electrode distance*square resistance / electrode length=w*r / l, the corresponding volume The resistance is also low), so when it is used as a heating material, the film thickness must be reduced (the film thickness is less than nm) to meet its power requirements. However, when the film thickness is too thin, the film is prone to discontinuity, and the uniformity is poor, which cannot meet the continuous and stable heating demand. , otherwise, under the 220V civilian voltage, the power density is too large and the film is easily burned

Therefore, the metal-based electrothermal film usually forms a pattern by hollowing out to increase its volume resistance and reduce its power density, but this causes other problems: the pattern method wastes raw materials, the process is relatively complicated, and it is necessary to avoid problems such as metal oxidation during the heating process. power attenuation

Although transparent conductive inorganic materials have been used in electric heating films in the market, their film thickness is tens of nanometers, or even hundreds of nanometers, so their square resistance and volume resistance are low, and they can only be used under low voltage (below 36V) conditions. Stable heat generation. When the voltage is increased, especially when the voltage reaches the civilian voltage of 220V, it cannot continue to generate stable heat. Usually, the temperature will be as high as 80°C. On the one hand, it is not suitable for integration into the floor for heating, and on the other hand, it will affect the performance of PET. an accelerated aging process

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