Preparation method for vulcanized sealant for fuel cells

Abstract

The invention discloses a preparation method for a vulcanized sealant for fuel cells. The preparation method includes the following steps: S1, selecting unvulcanized raw rubber, a vulcanizing agent and a catalyst to put into microwave generator equipment; S2, setting power, starting a microwave generator, performing vulcanization, and stopping a microwave heating process after M sec; S3, after cooling for L sec, restarting the microwave to perform vulcanization, and stopping the microwave heating process after N sec; and S4, cycling the step S2-S3 for multiple times, and performing an intermittent pulse vulcanization process until an appropriate vulcanized sealant is obtained. The preparation method is simple, high in production efficiency and low in energy loss, vulcanization uniformity can be effectively promoted, and product quality can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of fuel cell sealing, in particular to a method for preparing a sealant for bipolar plates in a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cells are composed of membrane electrodes, bipolar plates, collector plates and end plates, among which the bipolar plates are the core components of the fuel cell stack and are called the “skeleton” of the stack. According to different substrate materials, bipolar plates can be divided into graphite bipolar plates, metal bipolar plates and composite material bipolar plates. Bipolar plates made of graphite materials are currently the most commonly used bipolar plates in proton exchange membrane fuel cells. They have good electrical conductivity, thermal conductivity, and corrosion resistance. Difficulties lead to higher costs and other areas that need to be improved. As far as the metal plate is concerned, it has the ...

AI Technical Summary

Problems solved by technology

The traditional vulcanization method is mainly to realize the cross-linking and vulcanization of the sealant under high temperature heating conditions by adding vulcanizing agents and catalysts. This method is not only slow and inefficient, but also causes uneven vulcanization of the sealant and consumes a lot of energy. , is not conducive to the improvement of economic benefits

[0003] In the prior art, in order to maintain airtightness, a sealant is usually added between the bipolar plate and the membrane electrode frame, and the vulcanization of the sealant is usually carried out by heating at high temperature. This method will take several hours to vulcanize and bond agent, which leads to poor production capacity, which affects production efficiency and is not conducive to production line. At the same time, there will be uneven vulcanization due to surface heat conduction.

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