A kind of preparation method of ultra-soft and lightweight graphene electric heating film

Abstract

The invention discloses a preparation method of a super-soft and lightweight graphene electro-thermal film. A film is formed through assembling an ultra-large fragment-free graphene oxide solution, and a graphene sheet layer structure is repaired at a high temperature, so that inner defects of the graphene film are controlled to the greatest extent. The graphene film can realize rapid response to a high temperature of 25 DEG C to 1500 DEG C within a very short time of 1 second to 10 seconds under the voltage of 1V to 10V; the temperature rising and decreasing speed is 600 DEG C / s to 2000 DEG C / s. Meanwhile, the graphene electro-thermal film has a lot of folds and has extremely good flexibility, so that the graphene electro-thermal film is applicable to various types of flexible devices. Therefore, the graphene electro-thermal film is simple in structure and can be prepared in a large area and a large batch; the graphene electro-thermal film has the advantages of safe working voltage, high thermal conversion efficiency, good thermal conductivity, rapid response, capability of accurately controlling the temperature and good toughness, and can be used for different application environments.

Description

technical field [0001] The invention relates to flexible electrothermal materials, in particular to a method for preparing an ultra-soft and lightweight graphene electrothermal film. Background technique [0002] Graphene, a two-dimensional crystal material composed of a single carbon atomic layer, is the thinnest known material. It is called a magical material and has set off a research boom all over the world. Graphene has excellent electrical properties (electron mobility at room temperature can reach 2×10 5 cm 2 / Vs), outstanding thermal conductivity (5000W / (mK), extraordinary specific surface area (2630m 2 / g), its Young's modulus (1100GPa) and breaking strength (125GPa). Andre Geim and Konstantin Novoselov won the 2010 Nobel Prize in Physics for their contributions to graphene research. The excellent electrical and thermal conductivity of graphene completely exceeds that of metals. At the same time, graphene has the advantages of high temperature resistance and cor...

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Problems solved by technology

However, for nickel-chromium alloys, it is still insufficient in the following aspects: the density of nickel-chromium alloys is greater than 8g / cm3, and the thickness is several millimeters when used; the resistivity is low (~10-6Ω / m), and there are still low electrothermal conversion , the heating rate is small, the heating element has no automatic constant temperature and power compensation function, which makes the structure of the electric heating system complicated, and the thermal inertia is large; FeCrAl is a ferritic alloy, which has brittleness at room temperature, brittleness at 475°C and brittleness above 1000°C High-temperature brittleness, the low-temperature strength due to high-temperature brittleness eventually leads to short service life of the heating element; the alloy has poor weldability and is difficult to repair

[0004] There are two kinds of graphene electric heating films currently reported, one is graphene oxide electric heating film, which uses its resistance to generate heat, but its structure is unstable, so its heating fluctuates greatly and is uncontrollable; the other is graphite film or A fired polyimide film, however, has limited flexibility and breaks after a limited number of folds

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