High-temperature anti-oxidation ultrathin heating film and preparation method thereof

Abstract

The invention relates to the technical field of electric heating films, in particular to a high-temperature anti-oxidation ultrathin heating film and a preparation method thereof. The high-temperature anti-oxidation ultrathin heating film sequentially comprises an insulating substrate layer, a conductive layer, a transition layer and an oxidation layer; the conductive layer comprises conductive metal or / and conductive ceramic; the transition layer comprises an incompletely-oxidized oxide AOx of metal A, A can be oxidized to the highest valence of a, and x is larger than 0 and smaller than 0.5a; the oxidation layer comprises a completely-oxidized oxide BOy of metal B, B can be oxidized to the highest valence of b, and y is equal to 0.5b. The electric heating film has the advantages that the film is good in conductive effect and not prone to warping and falling off.

Description

technical field [0001] The invention relates to the technical field of electric heating film, in particular to a high-temperature anti-oxidation ultra-thin heating film and a preparation method thereof. Background technique [0002] A large number of studies have shown that if the temperature of cigarettes is lowered to below 500°C, that is, the so-called "tobacco is heated but not burned", many harmful components in the smoke can be greatly reduced, while nicotine and flavor components are relatively less affected. Some aroma components may even increase due to reduced pyrolysis. Based on this idea, a new concept tobacco product of "tobacco heating but not burning" came into being. The shredded tobacco of the tobacco product is only heated but not burned, which greatly reduces the release of harmful chemical components in the smoke. The implementation of heat-not-burn tobacco products is generally to physically separate the tobacco from the heat source. Therefore, one of ...

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Problems solved by technology

However, the production process of this method is complicated, and the energy consumption of the sintering process is high.

The second is to bury the wire, that is, to add the heat conduction wire to the heating sheet. The thickness of the heating film in this way is generally more than 1mm, which is difficult to meet the needs of miniaturization of electronic heating devices.

[0005] Based on this, it can be found that the existing electric heating film has the following defects: (1) Conductive carbon black and graphene are mostly used as conductive materials in the prior art. In other words, the conductive effect is relatively poor

(2) There are also existing technologies that superimpose metal particles on the basis of graphite to enhance the conductive effect, but after adding metal, an anti-oxidation layer such as aluminum oxide is usually required to prevent the oxidation of the metal. During the heating process of the electric heating film, the metal Inconsistent with the thermal expansion coefficient of the anti-oxidation layer, it is easy to cause problems such as deformation and shedding of the electric heating film

(3) Most of the existing electric heating films are made by mixing conductive particles with adhesives. When mixing, there are strict requirements on the precision and proportion of medicines, and the method is cumbersome; and although the particle size of conductive particles is on the order of 50nm , but after mixing a large number of particles and adhesives, the thickness of the electric heating film is more than 1 mm, which limits its application in heat-not-burn cigarette appliances

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