Study On Mechanism And Characterization Of Dye-free Coloration Based On Wool Fabric Pretreated With Fenton

Wool is the soft natural protein fiber and excellent fiber with many outstanding attractions, including soft handle, well warmth, comfortable. The main chemical constituent of wool fiber is keratin along with a small amounts of nonprotein such as mutton tallow, suint, sand soil and vegetable impurities. Utilization of the wool textiles for both the clothing and home textile items are mainly attributed to their comfort, elegance, freshness, excellent tensile properties.Usually, wool fabric is dyed by acid dyes or acid mordant dyes which are commercially available because of the ease of use and the various color shades available. However, some of them still have disadvantages such as a long dyeing time, a large amount of energy consumption and waster water, and the pollution of heavy metal for the environment. Therefore, the topics of ecology dyeing are investigated by related researchers. The dye-free coloration technology is attached attention in recent years, and its characteristic reaction mechanism without any dyes in the whole coloration process based on the wool fabric treated by Fenton reagent is the just reason for the attention. It has high value on saving energy and environmental protection.The thesis makes a brief introduction of the wool fabric and the mechanism of the wool fabric pretreated with Fenton reagent. The mechanism of dye-free coloration is also researched. The results of color, loss rate in strength, milling rate and loss weight rate are analyzed by orthogonal testing method based on single factor analysis of wool fabric pretreated by Fenton reagent, and the optimum condition of the wool fabric pretreated by Fenton reagent is put out. The Fenton pretreated processed has a great influence of the dye-free coloration because of the wool scale is destroyed by oxidizing action. Different benzaldehyde derivatives are chosen as reactant, respectively. They are discussed through single factors analysis that concentration of benzaldehyde derivatives, acid concentration, reacting temperature and reacting time have influence on the coloration of the fiber. The treated wool fabric are optimized analyzed on the color, the breaking strength and the fastness.The experimental results indicate that the wool scale destroyed by Fenton reagent in the pretreated processed, and the effect is determined by the amount of all reaction reagent in pretreated. The wool scale destroyed has been recognized as a major cause of wool fabric strength loss, color reaction increased and vestige of little color on the wool fabric. Compared with the untreated wool fabric by Fenton reagent, the color and reaction rate are increased obviously. Wool scales destroyed would make tryptophan easier to react with coloration substance, meanwhile the reaction temperature and reaction time reduced than the normal dyeing. The wool fabric treated by Feton reagent and dye-free coloration feels soft, the wet rubbing fastness and dry rubbing fastness of the samples are reached above 4 level, and increased by 0.5 level than untreated samples. The study on the dye-free color based on pretreated with Fenton reagent has great significance in decrease the waste water and environmental protection.