The working principle of Teflon waterproof and breathable membrane can be divided into two types: microporous and hydrophilic groups. The waterproof and breathable membrane uses the former. Since the minimum diameter of water droplets is about 20 microns, the diameter of water vapor molecules is only There is a huge difference between the diameters of the two, which is about 0.0004 microns. Water vapor can pass through the microporous membrane through the principle of diffusion. Liquid water or water droplets cannot pass through due to the surface tension of liquid water or water droplets, which prevents water penetration and causes The breathable membrane has a waterproof function.
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