Breathable and waterproof principle of waterproof fabric
What are the principles of Waterproof fabric? What types are it divided into?
The type is that after the fabric is impregnated with emulsions or solutions of various hydrophobic agents, drieddrying, and baked, a layer of hydrophobic genes is formed on the surface of the fabric to achieve waterproofing purposes. It is well known. The air permeability is slightlydifferent with different hydrophobic agents, but the waterproofness is not ideal, the water pressure resistance is low, and it is not resistant to washing.
The second type mainly utilizes the microporous nature of coatings and films. In the past, hydrophilic particles, porous fillers, foaming agents and other methods were added to the coating , to create a path for sweat vapor to be discharged in the coating, but the small holes produced by these methods are uneven and cannot completely prevent water droplets from infiltrating. Now starting from the polymer microstructural morphology, we have found that certain polymers can generate rows and sheets of fibrils under specific process conditions. The axis is stretched and deformed, forming multiple micropores between the rows. After heat treatment, the structure is fixed, and the diameter of these micropores is 0.2 to 10 microns FONT>, the porosity reaches more than 80%, which is equivalent to more than one billion micropores in one square centimeter, because the diameter of the micropores is 1/5000 of the diameter of a water droplet~1/20000, which is about 700 times the diameter of water vapor molecules, so it can prevent water droplets from passing through, while allowing water vapor molecules to pass freely, and sweat evaporatesSteam utilizes the temperature and humidity differences between the temperature inside the clothing and the outside environment to be discharged to the outside.
The third type is a combination of ultra-fine fiber and ultra-high shrinkage technology, using 0.1 denier or finer ultra-fine denier fiber, and the warp direction of the fabric is 16px >There are more than 10,000 fibers per inch, and there are 50,000 to 60,000 fibers per inch in the weft direction. The density of this fabric is about 20 times that of ordinary fabrics. The fabric is After shrinkage, it is 60% of the original gray cloth area, so the texture is tight, like synthetic leather, with fine villi standing on the surface, and the pores are only about 7 microns Right, it plays a breathable and waterproof role. This kind of microfiber can be synthetic fibers such as polyester, nylon, or cotton fiber.
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