Study On The Homochromatism Dyeing Of Cashmere Fiber

When the light-colored cashmere fiber is dyed with wool and reactive dyes,the skin spots are dark and the fibers are light because of their loose structure and strong capillary effect of skin spots.When dyeing in medium and dark color,due to the high crystallinity and difficult coloring of the two fine hairs and two types of wool which were called heteromorphic protein fiber hereafter that was contained in the cashmere fiber,the dyeing samples often mix with "bright hair".That is,the heteromorphic protein fiber is light in color and the cashmere fiber is dark,and the homochromatism between the two is poor.This results in the cashmere products in the repair process,so that the skin spots and heteromorphic protein fiber are needed to be removed artificially.This problem has long troubled the cashmere industry.To improve the problem of color difference between skin points and cashmere fiber,this subject adopted the auxiliaries XTR which has the adsorption film role to fiber,and gathering effect to dye.XTR has blockage effect to skin point,so it can inhibit the dyeing of skin point and make the dye of the fibers and the skin spots dyeing synchronicity,and finally improve the homochromatism between skin point and fiber.This topic exploreed Lanasol reactive dye dyeing for cashmere,a new technology for homochromatism between skin point and fiber was determined: when dye dosage was 1.0%(owf)or less,if it included Blue 8G,dosage of XTR was 4.0 ~ 5.0%(owf),formic acid dosage was 2.5 ~3.0%(owf),95 ? was preserved for 30min;if it did not contain Blue 8G,dosage of XTR was 4.0 ~ 5.0%(owf),formic acid dosage was 0.5 ~ 1.0%(owf),90 ? was preserved for30 min.To improve the problem of color difference between skin points and cashmere fiber,this subject adopted the auxiliaries 05 as dyeing auxiliaries,the additives can aggregate with dyes in the bath to form aggregated particles,and can significantly reduce the dye bath surface tension,speed up the adsorption of dyes and fiber,reduce the dyeing rate differences between cashmere fibers and heteromorphic protein fiber.With the increase of dyeing bath temperature,the dye-auxiliaries aggregates adsorbed on the surface of the fibers will be depolymerized due to the intensification of molecular thermal motion,so that the dyes will diffuse into the fibers in place,thus improve the homochromatism ofcashmere fibers and heteromorphic fibers.This topic explored Lanasol CE reactive dyex on the cashmere dyeing process,a new technology for homochromatism between skin point and fiber was determined: when dye dosage was 3.0%(owf)or less,dyeing auxiliaries 05 dosage was 2.0%(owf),formic acid dosage was 1.4%(owf),90 ? was preserved for 40 min.The new technology of skin spot and fiber homochromatism can reduce the dark skin spot in dyed cashmere by 10% to 40%,and the new technology of heterotype protein fiber and cashmere fiber homochromatism can obviously reduce the number of "bright wool" in dyed cashmere,so as to reduce the workload of manual removal in production and processing and improve the value of cashmere products.At the same time,the indexes of K/S value,color difference,color fastness,strength and fiber structure of dyed cashmere were basically the same as those of traditional processes.This is of great practical value in improving production efficiency and reducing production cost.