Dirt adheres to fabrics in different means, mostly depending on the sort of dust and textile characteristics.
(surfactant powder)
1. Fluid oily dust: primarily adsorbed on materials with van der Waals forces. Non-polar mineral oil dirt sticks securely to hydrophobic fibers such as polyester and polypropylene, however is reasonably very easy to get rid of on hydrophilic cotton fibers.
2. Water-soluble dirt: adsorbs tightly on hydrophilic materials such as cotton fibers and is difficult to eliminate, however is easy to diminish on hydrophobic fibers such as polyester and polypropylene.
3. Solid dirt: The adsorption approach is complicated, including being secured by twisted fibers, being wrapped in between fibers, and being adsorbed on the concave or smooth surface area of the fiber surface.
According to the force classification, the adhesion of dirt on fabrics can be summarized as complies with:
( surfactants fight dirt adhesion)
1. Mechanical force adhesion: solid dust particles abide by the material with the air flow, which is influenced by the density, texture and fiber characteristics of the textile. This kind of dirt is very easy to fall off during cleaning, yet it is hard to remove when the particle size is much less than 0.1 μm.
2. Van der Waals force attachment: caused by intermolecular electrostatic attraction, induction pressure and diffusion force, it is the primary factor for dirt attachment. Electrostatic attraction is particularly significant in between fibers and dirt with opposite costs, and multivalent cations can boost this adsorption.
3. Chemical bonding pressure bond: Dust types hydrogen bonds, ionic bonds and other chemical bonds with fibers, such as clay, fats, healthy protein dirt, dyes, ink, etc. When strongly bonded, it is tough to eliminate.
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