What is waterproof and breathable fabric? Waterproof and breathable fabric is waterproof, moisture-permeable and breathable. It is not only waterproof and windproof, but also has a certain warmth retention effect. Many sportswear is now made of this kind of fabric. This kind of fabric is also a quick-drying fabric. It permeates water very quickly and is generally used to make windproof jackets and raincoats.
Water does not penetrate into the fabric under a certain pressure, but the sweat emitted by the human body can be transmitted to the outside world in the form of water vapor through the fabric, thereby preventing sweat from accumulating and condensing between the body surface and the fabric to maintain the comfort of the garment. It is a High-tech, unique functional fabrics.
Types of waterproofwater-breathable fabrics
high density fabric
High-density fabrics use high-count microfibers and other ultra-fine synthetic fibers to make tight fabrics, so that the fabrics have high water vapor penetration and have a certain degree of waterproof after water-repellent finishing. >. The fabric is made of separated fibers. After high shrinkage, it supports the ultra-high-density fabric. Its density is 20 times that of ordinary fabrics. It can withstand water pressure up to 600mm water column and has a moisture permeability of more than 7000g/m2.24h.
coated fabric
Coated fabrics can be divided into two types: hydrophilic coatings and microporous coatings. Hydrophilic coated fabrics are coated with a hydrophilic coating on the surface of the fabric. Since the coating covers all the gaps in the fabric, it canWaterproof. If there are hydrophilic groups on the polymer chain and the content and arrangement are appropriate, they can interact with water molecules and adsorb water molecules on the high temperature side with the help of hydrogen chains and other intermolecular forces. The groups pass to the low humidity side for desorption. Moisture permeability is a process of “adsorption-diffusion-desorption”. The hydrophilic groups are called “chemical step stones.” If the intermolecular “pores” and chain segment sizes are at the same level, they will be selective for water molecules of different diameters, which is equivalent to a “molecular sieve”. Therefore, the introduction of hydrophilic groups into the coated fabric will improve its moisture permeability.
Coated fabrics are generally simple to process and are characterized by low moisture permeability and low water pressure resistance. Due to the limitations of raw materials, technology and the method itself, the contradiction between moisture permeability, air permeability, water pressure resistance and water washing resistance has not been resolved.
composite fabric
Composite fabrics combine excellent waterproof and breathable properties with windproof and warm properties, and have obvious technical advantages. It uses composite technology to combine the excellence of ordinary textile fabrics and high-tech film products, learn from each other’s strengths, fully demonstrate the characteristics of the era of differentiation and functionality, and represents the high-end of current waterproof and breathable fabrics. level.
Composite fabrics currently mainly include TPU films, PES films and e-PTFE films.
From a structural point of view, TPU and PES films are non-porous. They effectively transfer sweat in the clothing through the hydrophilicity of the structural polymer. Polymer molecules can form weak cross-links with water molecules and transport moisture along their own polymer chains. The direction is affected by temperature and humidity. As long as the temperature and humidity inside the clothes are higher than outside, the direction of the water vapor molecules is determined by Inside out. The e-PTFE film is microporous. It uses a unique processing technology to form a multi-microporous structure. The film thickness is between 25 μm and 35 μm. The opening rate is as high as 80℅, with more than 10 per square centimeter. There are billions of micropores, the pore diameter is more than 700 times larger than water vapor molecules, sweat can pass through, but the pore diameter is about 5000-20000 times smaller than water droplets, liquid water cannot pass through. Extended reading: https://www.yingjietex.com/product/Dobby-Checked-Pongee -breathbale-Fabric.html
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