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Polyester fabrics, why the wet rubbing fastness is high, dry rubbing fastness is low?

Date:2018-03-09Source:Shaoen Machinery
? ? ? ? Technology: Color fastness of cotton fabrics
? ? ? ? First talk about dark colors, such as deep red, black wear fastness
? ? ? ? In many cases, the reason why the wet fastness to rubbing of the cotton fabric is low is not the shedding of the dye but the loss of the fibril of the cotton dyed after dark dyeing and the appearance fastness is reduced. Since the friction resistance of cotton under wet conditions is large, the fibrils fall off and adhere to the stained white cloth. In the dry state, the friction resistance of the cotton is small, and the fibrils are less detached. Therefore, the dry rubbing fastness is less likely to cause problems.
? ? ? ? When the wet rubbing fastness was confirmed, the cotton fiber was dyed with a reactive black dye, soaped, and subjected to an extraction test using an organic solvent (dimethylformamide). Even dyed materials with good dye-fixing can sometimes only reach grades 2 to 3 in the wet rubbing test. Therefore, poor dyeing is not considered to be a direct cause of poor wet rubbing fastness.
? ? ? ? However, the wet rubbing fastness may sometimes be lower than Grade 2 if the dyestuffs attached to the fabric surface are not thoroughly soaped. When dyed dark, it must be completely soaped. From the results of the tests, the normal dyeing under general conditions has a dark wet rubbing fastness of 2 to 3, but it is generally difficult to reach 3 levels.
? ? ? ? As described above, the shedding of the fibrils has a certain influence on the state of the fibers such as the yarn form and the weave of the fabric, and even if the same dye is used and the depth is used for dyeing, a difference of about a half grade occurs. Reducing the friction coefficient of the fiber surface has a certain effect on improving the wet rubbing fastness. Treatment with a water-repellent finishing agent such as silicon is also extremely effective. If these methods are used, it is possible to change the fabric style or functionality, so it is not suitable for any situation.
? ? ? ? In addition, the wet friction resistance of polyester fabric is less than that of dry friction, and contrary to cotton, its wet rubbing fastness is high, and the dry rubbing fastness is low.
? ? ? ? Discussion: Analysis of Color Fastness
? ? ? ? The dye-stained cellulose fibers are chemically bonded to the fibers in the form of covalent bonds. Therefore, in theory, the covalent bonding between the dye and the fiber can give excellent dyeing fastness. In fact, the dyeings often fade, discolor or stain during testing, use, washing, and even storage. Especially, the wet rubbing fastness and soaping rubbing fastness when dyeing dark colors, and the fastness to light and chlorine bleaching fastness when dyeing light colors are unsatisfactory.
? ? ? ? The main reasons for the poor color fastness are two aspects: one is the dye's own problem; the second is the dyeing process.
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