Method for preparing polyimide heating film

Abstract

The invention provides a method for preparing polyimide heating film, comprising: step A, according to the requirements of square size area S, working voltage V and heating power P of a heating area of the heating film, calculating the required equivalent resistance R'=V2 / P, and then utilizing electrode distribution quantity to calculate the surface resistance R=L*R' / W of the heating film; step B, according to the surface resistance R figured out in the step A, producing a conductive polyimide film corresponding to the surface resistance R; step C, cutting the conductive polyimide film into square heating films with the area of S, and distributing a positive electrode and a negative electrode along the L direction; step D, covering insulating films at the two sides of the heating films for compound protection; and step E, welding or riveting electric wires on the positive electrode and the negative electrode, and making insulating or dampproof protection at the connection part. The method has the advantages that the electrical heating film produced by the method not only solves the problems of low temperature heat emission and intermediate temperate heat emission, but also has wide temperature using range, etc.

Description

technical field [0001] The invention relates to a preparation method of a polyimide heating film. Background technique [0002] There is a great demand for electric heating film in the market, such as the heating film of car seat cushion, which requires high strength. However, ink printing heating film, carbon fiber heating film, polytetrafluoroethylene heating film, etc. are generally used at present, but these films have common problems such as low mechanical strength, narrow temperature range and low temperature, uneven power, and large temperature fluctuations. From the invention of electricity to the present, the way of electric heating has been developing, but at present, the heating method of medium and low temperature tends to be more and more flexible heating, especially in the middle temperature range (80 ℃ to 250 ℃) There is a lack of flexible heating, so the development of An electric heating film that can solve both low-temperature heating and medium-temperatur...

AI Technical Summary

Problems solved by technology

However, at present, ink printing heating film, carbon fiber heating film, polytetrafluoroethylene heating film, etc. are generally used, but these films have common problems such as low mechanical strength, narrow temperature resistance range and low temperature, uneven power, and large temperature fluctuations.