Photo-curable resistance paste for flexible electrothermal film and preparation method of photo-curable resistance paste

Abstract

The invention discloses photo-curable resistance paste for a flexible electrothermal film and a preparation method of the photo-curable resistance paste. The resistance paste comprises the following constituents by weight: 40-80% of solid phase and 20-60% of organic binding agent, wherein the solid phase comprises 80-100% of silver powder and 0-20% of oxide by weight, the silver powder comprises 30-90% of sheet-shaped silver powder and 10-70% of linear silver powder by weight, the organic binding agent comprises 65-90% of photo-curable resin, 5-30% of photo active monomer, 0.5-5% of photo initiator, 0.1-1% of defoaming agent and 0.5-2% of dispersing agent by weight. By the resistance paste, photo-curable formation can be adopted, the resistance adjustment range can be expanded, and the effect of building a conductive path in the sheet-shaped silver powder by the linear silver powder can be fully utilized. The preparation method comprises the three steps of solid phase preparation, organic binding agent preparation and resistance paste preparation, and can be used for effectively producing the photo-curable resistance paste for the flexible electrothermal film.

Description

technical field [0001] The invention relates to the technical field of electronic materials, in particular to a photocurable resistance paste for flexible electric heating films and a preparation method thereof. Background technique [0002] Flexible electric heating film is a new low-temperature heating material in the electric heating film heating technology. It is soft and thin like a paper tape, has high tensile strength, good folding resistance (10,000 times), and generates heat in a planar shape. The thermal efficiency High, wide working voltage range (2.4-380 volts), power can be set according to needs, can be cut and shaped arbitrarily, and it is easy to realize energy conversion under low voltage. Based on the above characteristics, flexible electric heating films are widely used in household and industry; for household use, flexible electric heating films are often used in safe electric heating clothing, electric heating products, direct heating showers, electric k...

AI Technical Summary

Problems solved by technology

[0004] Further explanation is required. Precious metals and rare earth elements have good electrothermal conversion and heat conduction capabilities, and are usually used in electrothermal films in the form of electronic pastes. For example, the patent number is: 201010158934.X, and the name is: YBCO thick film resistors based on stainless steel substrates The Chinese invention patent of the slurry and its preparation method and the patent number is 200610036715.8, the name is: the Chinese invention patent of the rare earth base metal resistance slurry and its preparation process for the rare earth thick film circuit based on the metal substrate, the above two Chinese invention patent institutes The disclosed resistance pastes are all made of metal powder into electronic paste, and then the resistance heating layer is formed by screen printing and high-temperature sintering. The sintering temperature is usually above 500°C, but the maximum temperature of the flexible substrate is about 400°C. This limits the application of the sintering process on flexible substrates to a certain extent; therefore, seeking a mild curing process is the basic way to prepare the resistance heating layer in the flexible electrothermal film

[0005] It should be further pointed out that the application number is: 201510183663.6, and the name is: a Chinese invention patent for a method of manufacturing a flexible electrothermal film, which discloses that the preparation of a resistive heating layer involves magnetron sputtering coating, filming, exposure, etching and other processes, effectively avoiding The high-temperature sintering process was started, and iron-nickel-manganese-chromium alloy was used to replace precious metals in the process, which reduced the cost of materials to a certain extent, but also brought some new problems: 1. The replacement of precious metals by iron-nickel-manganese-chromium alloy reduced the electric heating layer Stability and electrothermal conversion ability; 2. There are many steps in the preparation of the electrothermal layer, which increases the complexity of the process to a certain extent; 3. Etching will generate a large amount of waste liquid, which is not conducive to environmental protection