Microporous layer slurry capable of regulating and controlling permeation depth, gas diffusion layer and preparation method

The invention relates to the field of fuel cell materials, in particular to microporous layer slurry for regulating and controlling permeation depth, a gas diffusion layer and a preparation method. The microporous layer slurry is prepared from the following raw materials: a dispersing agent, conductive carbon black, a water repellent and an acidic organic thickening agent; the mass ratio of the acidic organic thickening agent to the microporous layer slurry is 0.05-0.2; the acidic organic thickening agent is introduced into the microporous layer slurry, the mass ratio of the acidic organic thickening agent to the whole microporous layer slurry is limited, the resistance of the microporous layer slurry in the permeation process can be adjusted by regulating and controlling the proportion of the acidic organic thickening agent, and in the later preparation process of the gas diffusion layer, the resistance of the microporous layer slurry in the permeation process can be adjusted. The acidic organic thickener ca