Conductive film and preparation method thereof, heatable mica plate and manufacturing method thereof

Abstract

The invention discloses a conductive film, which comprises 15-30 parts of conductive powder and 70-85 parts of adhesive, wherein the conductive powder comprises 50-75 parts of graphite powder and 10-30 parts of graphene. The invention also discloses a preparation method for the conductive film. The invention also discloses a heatable mica plate, which comprises at least one piece of impregnated paper and the conductive film cured on the surface of the impregnated paper. The invention discloses a manufacturing method for the heatable mica plate. The advantages that the resistivity of the mica plate is larger than that of a metal heating wire and smaller than that of graphite powder by changing the structural arrangement of the mica plate, so that the application of heating bodies with smallarea, high power and high heating temperature of ring-shaped heating elements, plate-shaped heating elements and special-shaped heating elements and the like is met.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a conductive film and a preparation method thereof, a heat-generating mica board and a preparation method thereof. Background technique [0002] The mica board for electric heating equipment made of mica as the base material has excellent anti-corrosion, impact resistance, lightning protection, arc protection, high insulation, low temperature resistance (-60 °C), high temperature resistance (250 °C) and other excellent properties. It is widely used in aerospace, aviation, military industry, nuclear power, metallurgy, radar power transmission and distribution systems, lightning protection engineering and high-tech applications such as submarines, automobiles, shipbuilding, and ultra-high voltage power grids. [0003] The mica plate for electric heating equipment manufactured in the prior art is only suitable for the support and insulation of the heating element o...

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Problems solved by technology

[0004] Compared with metal heating wires, graphene in the prior art is the material with the smallest resistivity in the world today, while graphite has a higher resistivity, but neither of them can be used as a heating element for heating elements with small area and high power

[0005] The prior art application number is 2011100827877, which discloses a mica plate coating electric heating device. The main component of the conductive film coating of the device is composed of 40-60 parts of nano-scale carbon powder. From the perspective of environmental protection, In addition to carbon ink, iron oxide and polyester, the toner also contains a lot of metal dust, such as nickel, and mercury that is harmful to the body. In addition, there are carcinogens that people are familiar with, such as benzene, aldehydes, etc. , styrene, etc. During the production process, a large amount of fine particle dust (not visible to the naked eye) in nano-scale carbon powder floats in the air and is easily absorbed by operators. A few parts per million of a gram can endanger the secretion of human hormones, resulting in Sperm counts decrease in men and infertility in women, therefore, this material is not suitable for industrial production

From the analysis of physical properties: when the relative humidity of the environment is greater than 50%, the rapid water absorption rate of toner is more than 20%, which cannot be used normally in most areas of our country, especially in most seasons in the southeast coastal industrially developed areas. In view of For the above reasons, this patent has not been popularized and applied in the industrial field so far. In order to overcome the fatal flaw of this conductive film, it is very necessary to provide a new conductive film formula and its manufacturing method

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