The antifouling of non-woven fabrics is considered from the following two aspects:
（1） Oil repellent finishing
（2） Easy decontamination finishing
The purpose of easy decontamination and finishing is to make the oily liquid dirt on the hydrophobic fiber easy to be removed, and because the liquid dirt is often used as the carrier and cement of particles, if the liquid dirt is easy to wash away, the particles will also be easy to be removed. In addition to the factors such as washing conditions, the separation of dirt from the surface of non-woven fabric mainly depends on the critical surface tension of fiber surface, that is, it is related to the surface energy of non-woven fabric. Fabric should be easy to decontaminate and moisture resistant. It has high wettability in liquid medium and low interface energy for common oily dirt in air medium. Only in this way can it have good antifouling effect.
Liquid dirt is first contaminated on the fiber surface through wetting, and then contaminated inside the fabric, between fibers and between yarns through capillary action. Its principle is similar to the wetting and penetration of water on the fiber surface, but the surface tension of oily liquid dirt is usually smaller than that of water. Therefore, the wettability of liquid dirt on nonwovens is strong.