Graphene heating ink, preparation method and application thereof

Abstract

The invention discloses graphene heating ink, a preparation method and application thereof. The graphene heating ink comprises a resin matrix, conductive filler, an assistant and a solvent, wherein the conductive filler comprises graphene, the resin matrix is composed of an organic polymer and polysilazane in a mass ratio of 1:0.08-1.5, and the graphene heating ink further comprises a cross-linking agent; the preparation method comprises the following steps of: stirring and dispersing graphene in a powder form and polysilazane in a polysilazane solution form for fully mixing, and then adding the rest raw materials under stirring to obtain the graphene heating ink. The invention also relates to an electric heating film prepared from the ink, on the premise that excellent conductivity at a low temperature is guaranteed, the characteristic that the resistance is greatly improved at a high temperature is achieved, then self-temperature-limiting is achieved, meanwhile, when the electric heating film returns to a normal temperature, the resistance value of a material is not greatly changed, and reversibility is good, therefore, the recycling performance and the safety of the electric heating film are improved.

Description

technical field [0001] The invention belongs to the field of electrothermal materials, in particular to a graphene electrothermal film, in particular to a graphene heating ink and its preparation method and application. Background technique [0002] The rapid development of society is based on the serious consumption of natural resources. As people put forward higher and higher requirements for the quality of life, such as: good heating effect, high safety, energy saving and environmental protection, etc. At present, there are mainly two heating methods, one is coal heating, and the other is electric heating. In the past two decades, the intensification of environmental pollution has seriously affected our lives and endangered our health. Therefore, electric heating can effectively reduce the consumption of coal resources, and at the same time protect our safety and the environment. However, while meeting people's heating needs, it is necessary to continuously improve the c...

AI Technical Summary

Problems solved by technology

[0006] The prior art with the Chinese patent announcement number CN103338538A disclosed a graphene radiation heating film and its preparation method and application on October 2, 2013. The patent improves the electrothermal conversion efficiency, high power and high hardness of the electrothermal film. Unfoldable and other aspects have been significantly improved, but the heating film has the following problems: once the surface of the heating film is covered during use, the heat cannot be dissipated in time, which will inevitably lead to excessive local temperature and excessive potential risk factors

[0007] The prior art of Chinese Patent No. CN103607795A disclosed a method for preparing a graphene heating film on February 26, 2014. The patent prepared a low-voltage, adjustable-size graphene heating film through a simple and easy-to-control method , the heating is uniform in a relatively small area, but in the case of a relatively large heating area or under the cover, the heat cannot be dissipated in time, which will lead to excessive local temperature, which is likely to cause safety hazards

[0008] The prior art with the Chinese patent announcement number CN103476158A disclosed the PTC composite material heating film and its preparation method and application on June 3, 2015. The patent obtains PTC characteristics by compounding conductive fillers and crystalline or semi-crystalline polymer composite materials. Composite materials, but because of the use of crystalline or semi-crystalline polymer materials, it relies on the thermal expansion and contraction of the polymer material itself to adjust the resistance, which is determined by the organic polymer material and structure mechanism. After each flow impact, the resistance value It becomes larger and cannot be restored to the original value, and the reversibility is not good, and when the high-voltage and high-current pulse impacts, the outer package is easy to burst, which greatly shortens the service life of the heating film

Although the patent adds the PTC function of the graphene heating film, the PTC functional material used is either highly toxic or uses lanthanides, actinides and other group elements, which are more expensive and are powders that are not easy to disperse in ink. , there is a serious dispersion instability problem, and this patent only uses a conventional stirring method, there is a problem of batch instability, which is not conducive to industrial application

Images