▎ 摘　　要

NOVELTY - Preparation of gas diffusion layer carbon paper by continuous coating involves mixing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, a conductive carbon material, an inorganic fiber and a tackifier to obtain a slurry, spraying on a surface of PTFE nonwoven fabric coated with aluminum hydroxide sol, continuously carrying out acid treatment and ammonia treatment to obtain a nonwoven fabric with a coagulated spray coating, spraying a hydrophobic agent on the surface by ultrasonic atomization and then drying. The preparation method involves: (1) uniformly dispersing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, conductive carbon material, inorganic fiber and tackifier to obtain the slurry; and (2) soaking the PTFE nonwoven fabric in the aluminum hydroxide sol to form a film, then taking out, drying, spraying the slurry on the surface of the nonwoven fabric, and introducing into acid and ammonia environment for treatment to form a silicon dioxide gel on the surface. USE - The method is useful for preparing gas diffusion layer carbon paper. ADVANTAGE - The method enables simple, economical and large-scale continuous preparation of the gas diffusion layer carbon paper with less energy consumption. The carbon paper has high conductivity, strength and flexibility and uniform pore size distribution. DETAILED DESCRIPTION - Preparation of gas diffusion layer carbon paper by continuous coating involves mixing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, a conductive carbon material, an inorganic fiber and a tackifier to obtain a slurry, spraying on a surface of PTFE nonwoven fabric coated with aluminum hydroxide sol, continuously carrying out acid treatment and ammonia treatment to obtain a nonwoven fabric with a coagulated spray coating, spraying a hydrophobic agent on the surface by ultrasonic atomization and then drying. The specific preparation method involves: (1) uniformly dispersing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, conductive carbon material, inorganic fiber and tackifier to obtain a slurry; (2) soaking the PTFE nonwoven fabric in the aluminum hydroxide sol to form a film, then taking out, drying, spraying the slurry on the surface of the nonwoven fabric, then conveying by rollers, continuously introducing into acid environment and ammonia environment for treatment to form a silicon dioxide gel on the surface, and solidifying the sprayed slurry layer to obtain the nonwoven fabric treated with the coated slurry; and (3) introducing the nonwoven fabric treated with the coated slurry into an ultrasonic atomization chamber using a drawing roller, ultrasonically spraying the hydrophobic agent on the surface of the nonwoven fabric to form a nano-level hydrophobic layer, then introducing into a drying chamber for drying, and leveling to obtain loose and flexible fuel cell porous carbon paper.