Study On The Perspiration-Light Stability Of Reactive Dyes

The cotton samples dyed with twelve conventional reactive dyes were studied in this paper. Their perspiration-light stabilities were tested and compared with corresponding light and perspiration stabilities. For those whose perspiration-light stabilities were quite different from their light and perspiration stabilities, some factors influencing their perspiration-light stabilities were studied through changing the dye concentration, fiber styles, environment factors, combination and pH of the perspiration. Then the influence of perspiration, light and chlorine on these dyes was studied.The results show that the perspiration-light stabilities of these dyes were different from their light and perspiration stabilities. The increase of the dye concentration induced an advance in the light and perspiration-light stability. The light and perspiration-light stabilities on rayon fabrics were higher than those on cotton fabrics except for a special dye. Artifical perspirations composed as different criterions also had some influences on the perspiration-light stability. The influences of the artifical perspiration composed as AATCC,ATTS and GB criterions were studied. It was found that the ATTS one had the maximal influence. The introduction of the lactic acid in the perspiration might reduce the perspiration-light stability. The more lactic acid introduced, the lower the perspiration-light stability became. The increase of the artifical perspiration pH reduced the perspiration-light stability of most azo reactive dyes, while it rarely affected that of non-azo reactive dyes. The perspiration-light stability decreased with the increase of the relative humidity and the light intensity. But lamp-house styles had no influence on the perspiration-light stabilities of these dyes. For the influence of perspiration, light and chlorine on these reactive dyes, three methods, namely one-step method of dipping samples in the compound solution of perspiration and natatorium water and two-step methods of dipping samples in the solution of perspiration and natatorium water successively were adopted. The results show that the method of compound solution gave the worse stability than two-step methods. And for the two-step methods, dipping perspiration first gave better stability than another one of dipping natatorium water first.