Graphite paper composite heating plate and preparation method thereof

Abstract

The invention relates to a graphite paper composite heating plate and a preparation method thereof. The graphite paper composite heating plate comprises a heating film composed of a first surface and a second surface; and a heat dissipation plate arranged on the second surface of the heating film. The heating film comprises a second insulating film, a second resin colloid layer arranged on the surface of the second insulating film, a graphite paper heating layer arranged on the surface of the second resin colloid layer, a first insulating film arranged on the surface of the graphite paper heating layer, a first resin colloid layer arranged on the surface of the first insulating film, and a terminal connected with the graphite paper heating layer and used for connecting the positive and negative electrodes of a power supply. The heat dissipation plate is attached to the heating film through the first resin colloid layer. According to the invention, the graphite paper serves as a heating layer, and the manufacturing process is simple, wherein a large-size heating plate can be manufactured without splicing up small-size heating materials to form the large-size heating plate. Therefore, the manufacturing process of the large-size heating plate is reduced. Meanwhile, a reflecting layer and a heat preservation layer are added, so that the whole heating plate can only transmit heat to the whole surface. Therefore, the heating efficiency of the whole heating plate is improved. The graphite paper heating layer is combined with a metal heat dissipation plate. As a result, on the premise that the heating effect is guaranteed, the graphite paper heating layer is protected by the metal heat dissipation plate. The damage risk of the graphite paper heating layer is reduced, and the service life of the whole heating plate is prolonged.

Description

technical field [0001] The invention relates to a graphite paper composite heating plate based on graphite paper electric heating and a preparation method thereof. Background technique [0002] The existing high-temperature heating film heating element is a circuit formed by etching metal foil, and the emissivity of the metal foil is low, so the electrothermal radiation efficiency is low, which cannot meet the needs of electric heating devices with high electrothermal radiation efficiency. Emissivity refers to the ratio of the radiation ability of an object to the radiation ability of a black body at the same temperature, also known as emissivity, which characterizes the radiation ability of an object to light. [0003] The electrothermal radiation conversion efficiency of the existing metal foil heating film is below 20%. [0004] The main production steps of metal foil electric heating film are as follows: [0005] 1. Cover the insulating film with metal foil; [0006] ...

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Problems solved by technology

[0012] Chinese patent (CN 104883760 A) discloses an electric heater with a graphene film as the heating body. The graphene film is prone to uneven heating as a heating body. The preparation and processing process is easy to cause damage, and the uneven square resistance of graphene can also easily cause uneven heating; in addition, because graphene is too thin, it is easy to burn when working with high current, so it is difficult to achieve high temperature heating

[0013] Chinese patent (CN201520360467.7) discloses a composite heat-conducting floor made of graphite paper and aluminum plate combined with wooden floor, but the thickness of graphite paper is between 800 μm and 1000 μm, and the surface thermal conductivity of graphite paper is 400-440W / m.K, but the thickness of graphite paper The directional thermal conductivity is only 8-12W / m.K, and gradually decreases with the increase of thickness, so the thermal conductivity effect is not very good. At the same time, the large thickness of graphite paper results in high production cost and difficult processing technology for too thick graphite paper. Paper patterning is just a simple sandwich structure, which does not make full use of the good thermal conductivity of graphene

[0014] The Chinese patent (CN201520759944.7) graphite paper heater is similar to the Chinese patent (CN201520360467.7), but simply requires the length and width of the graphite paper heating source in the current direction, and the product is difficult to meet the increasingly refined market demand.

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