Water repellency of textile fabrics

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Textile fabrics waterproof finishing water repellent fabrics

Finishing that makes water impermeable to fabrics can be divided into two categories: one is called waterproof finishing, which is to coat a layer of impermeable continuous film on the surface of the fabric to block the pores of the fabric and prevent water and air from passing through. It is commonly used for industrial supplies and decorations, such as tents, truck tarps and curtains; the other type is called water-repellent finishing, which is to apply a layer of water-repellent film on the fabric fibers that cannot be wetted by water, but does not close the gaps in the fabric. The fabric is both water-repellent and breathable. The waterproof fabrics produced by City Textile generally refer to water-repellent fabrics.
Water-repellent finishing fabrics are characterized by being both water-repellent and breathable, and are mainly used for clothing. There are three types of water-repellent finishing: temporary, semi-durable and durable, which mainly depend on the chemical structure of the water-repellent agent itself. When the fiber surface of the fabric is evenly covered with a layer of water-repellent agent molecules, the water-repellent effect can be achieved.
The water-repellent properties of the fabric after water-repellent finishing are due to changes in the surface properties of the fibers in the fabric. Most water-repellent finishing agents contain long-chain aliphatic hydrocarbon compounds. When the fiber surface is filled with molecules with hydrophobic groups, the water adsorption characteristics of the fiber can be reduced or eliminated. Therefore, the water-repellent finishing effect can be achieved by using the fabric surface, air It is represented by the relationship between surface or interfacial tension between water and water.
In water-repellent finishing, common water-repellent agents generally have, in addition to long-chain aliphatic hydrocarbon water-repellent groups with low surface energy, other groups that can react with fibers or have strong adsorption with fibers. The water-repellent effect has a certain degree of durability. The water repellency of fabrics is also related to the distribution of water repellent on the surface of cellulose fibers. The water-repellent agents are not completely neatly distributed, which will affect their water-repellent effect.
The water-repellent fabrics produced by City Textile are mostly used to make protective clothing, so the fabrics are required to be waterproof and breathable. Waterproofing and moisture permeability are two opposite but closely related important properties in the wearing performance of fabrics. Waterproofing refers to preventing water droplets from entering the interior from the outside of the fabric, while moisture permeability refers specifically to sweat and moisture passing through the fabric from the inside to the outside. Spread out.
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