Electric heating film is a kind of film that can generate heat after being energized. It is a planar heating element composed of an electrically insulating material and a heating resistance material encapsulated therein. Because with the improvement of people's quality of life, personalized heating or physiotherapy products that are easy to control independently are increasingly favored by consumers, especially electric heating film products. For example, far-infrared physiotherapy products, heating murals that can be used for heating, plug-and-heat electric blankets, heating floor heating, etc., these products are likely to become an indispensable assistant in your life! Therefore, it is necessary to understand them.
Different conductive substances and film-forming substrates can form many kinds of electric heating films. According to the national "Low Temperature Radiation Electric Heating Film" (JG/T286-2010) construction industry standard issued in 2011, according to the different heating elements, the low-temperature radiation electric heating film is divided into three categories: metal-based electric heating film, inorganic non-metal-based electric heating film, and polymer electric heating film. Among them, inorganic non-metallic electric heating film is divided into two categories: "carbon-based ink electric heating film" and "carbon fiber electric heating film". We investigated most of the products on the market, 99% of the electric heating film, nothing more: wire electric heating film, carbon fiber electric heating film, carbon crystal plate electric heating film, PTC ceramic electric heating film, carbon-based ink electric heating film and today's coating online key to identify graphene heating film. So, what do they all look like? If you were to choose, what attributes would you care about the most?
Principle of graphene heating sheet
Here you will find that graphene electric heating film, that is, 100% graphene film design electric heating film, has two characteristics:
1. The 100% graphene electric heating film is flexible and transparent, and its light transmittance is close to 97%.
2. 100% graphene electric heating film is 100% safe, and some other electric heating films have potential safety hazards.
Why is the graphene electric heating film transparent? How can it be proven to be safe? What are the properties and insafety of other electric heating films? If you want to solve the confusion, you must find out the cause. Let's focus on "carbon-based" electric heating films. First of all, the coating online takes you to understand the electric heating film processing process, which usually has:
1. The film is directly prepared on the heated carrier, for example, after mixing conductive substances and film-forming substances into slurry, coating them on the object to be heated, drying the film, pyrolysis spraying into the film; Such as carbon-based ink electric heating film.
2. Elementization of electric heating film, such as mixing conductive substances and film-forming substances and extrusion molding; Such as carbon fiber/carbon crystal plate electric heating film.
3. Chemical/physical vapor deposition, vacuum spraying, ion sputtering, screen printing and other methods are used to make the conductive material and the film-like substrate form one; Such as graphene electric heating film, carbon-based ink electric heating film.
Carbon fiber heating film
1. Poor safety and easy to burn
2. The internal fiber filament is easy to break
3. The temperature is unbalanced and difficult to control
4. Not waterproof
5. Not resistant to acid and alkali
6. Poor creep resistance
Carbon fiber is a fiber material with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystallines along the axial direction of the fiber, and obtained by carbonization and graphitization treatment. The heating substrate of carbon fiber heating element is composed of polydilitrile and viscose-based carbon fiber through a special process. Its advantages are light weight, softness, and good fit with the human body. However, the shortcomings are also shown in the figure (the picture shows the experiment done by Xiaobian on the products on the market, almost touching the laboratory) and the attributes, which are very obvious, and the resulting safety accidents cannot be described as unattractive.
Carbon crystal heating film
1. Easy aging, serious thermal efficiency attenuation
2. Carbon particles and adhesives are easy to delaminate
3. Release harmful gases
4. Risk of voltage breakdown leakage
5. Short life
Carbon crystal, first of all, please do not confuse it with liquid crystal. There is no such material as carbon crystal, and there is no such name in technical terms. Carbon crystal is just a name for confusing right and wrong by the merchant itself. Simply put, carbon crystal products are a kind of plate made of carbon particles or short carbon fiber as conductive materials and pressed by adding adhesives. This electric heating film has been controversial for a long time since its launch. Its durability is also being tested.
Carbon-based ink heating film
1. Release harmful substances
2. Easy to crack
3. Bubbling causes the insulation layer to peel off
4. Not resistant to acid and alkali
5. Risk of voltage breakdown combustion
Carbon-based ink-type electric heating film, heating materials are graphite, carbon particles, metal oxides, etc. The production process of carbon-based ink electric heating film is to make ink-like slurry together with the above heating materials and other fillers, and quantitatively printed on the polyester film pre-bonded with metal current carrier strips (as electrodes) by screen printing process, and then covered with polyester film to form an insulating structure, so it is also known as printing ink electric heating film. The power control of this type of electric heating film is mainly achieved by the slurry composition, ink strip thickness and spacing. Due to the heat influence of graphene, some merchants will dope a small amount of graphene powder or slurry when preparing this electric heating film to render the concept of graphene electric heating film.
Graphene heating film
1. Safe and environmentally friendly, no combustion
2. Flexible and transparent
3. The temperature surface is balanced and easy to control
4. Waterproof and anti-corrosion
5. Good pressure and weather resistance
6. Good stability
Graphene electric heating film is the only flexible film of pure carbon atoms doped with other substances in all electric heating films, it is a single layer of carbon atoms grown by chemical vapor deposition, which is characterized by transparency, safety, electro-thermal conversion efficiency is the highest or tied highest of all electric heating elements, almost no other form of energy loss in the energy conversion process, such as mechanical energy, light energy, chemical energy, etc., electro-thermal conversion efficiency is close to 100%. Among them, the proportion of electro-thermal radiation conversion efficiency is also the largest among electric heating components with the same unit area of power.
Summary: It is worth noting that with the advantages of graphene materials, some of the hyped graphene film products on the market are pressed into a film after oxidation of graphite, which is usually a black film, or some doped with a small amount of graphene powder, expanded graphite, graphite microflakes prepared by electric heating film, etc. have become the hardest hit area of pseudo-graphite dilute concept and capital speculation, mixed fish, resulting in unstable product quality on the market, a variety of safety hazards, which is not graphene material itself. However, some companies are eager to achieve quick results when using graphene, ignoring the rights and interests of consumers, and over time, it will lead to consumers' misjudgment of graphene materials, and also bring negative effects to the development of the graphene industry. In the early stage of the development of the graphene industry, responsible enterprises are needed to make good products and applications, treat the graphene industry more pragmatically, and strive for perfection to create products!