Preparation method of flaky magnetic electrothermal composite material

Abstract

The invention relates to the technical field of functional polymer composite materials, and discloses a preparation method of a flaky magnetic electrothermal composite material, which effectively regulates and controls a lap network and a dispersion state of functional particles through particle size compounding of filler particles and a surface attachment process of polyethylene wax. When two ends of the sheet-shaped magnetic electric heating composite material are electrified with direct current, heat can be generated, so that the temperature of the whole material is increased. The heat conductivity coefficient of the composite material is relatively high, so that heat generated by electrification can be quickly transferred, and the temperature of the whole heating sheet is uniform. When the temperature is too high, thermal expansion of the magnetic electric heating material cuts off part of a conductive path, and an excellent intelligent self-protection mechanism is formed. Acupuncture devices can be adsorbed on the surface of the sheet-shaped magnetic material through magnetic force, and convenience is provided for popularization of the traditional Chinese medicine acupuncture physiotherapy technology. The composite material prepared by the method is adjustable in formula, high in thermoelectric conversion efficiency, excellent in mechanical property, simple in production method, stable in performance and easy for large-scale production.

Description

technical field [0001] The invention relates to the technical field of functional polymer composite materials, in particular to a preparation method of a sheet-shaped magnetic and electrothermal composite material. Background technique [0002] With the rapid development of aerospace, electronic and electrical, metallurgical chemical, transportation, automobile, military and medical industries, higher requirements are placed on the function and intelligence of new materials, especially the heating methods in the field of thermally conductive materials and the use of new heating materials. Development research has become a research hotspot in the fields of materials science and energy development. The traditional commonly used heating methods mainly use coal, oil, natural gas, gas and electricity as energy sources. Electric heating has been widely used because it is easy to control and adjust, does not pollute the environment, and is conducive to improving product quality. T...

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Problems solved by technology

However, non-metallic electric heating materials also have many disadvantages: ① SiC materials are used in high-temperature oxidizing atmospheres. It is easy to cause SiC components to be burned due to strong oxidation, which restricts their wide application in higher temperature fields.

② The problem of matching the synthesis process of lanthanum chromate material with the sintering process has not been solved satisfactorily

To some extent, it hinders the speed of product development. There is a big gap with foreign products

③ZrO2 heating element can only be used under the condition of protection device and auxiliary heating element

However, molybdenum disilicide still has the disadvantages of poor room temperature toughness and low high temperature strength, which limits its development and application.

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