Abstract:

In view of the blindness on the modification degree of cotton, a simple and effective method was established to quantitatively detect the degree of cotton cationization. The cationized cotton was dyed with simple acid dyes with mono anionic group, and the adsorption of acid dyes in cationic cotton fiber conforms to the Langmuir type, so the number of the cationic charges on the modified cotton fibers was in line with the dyeing saturation value accurately. When the cationized cotton was dyed with acid yellow 36 or acid orange 7, we have studied that the difference in dye structure caused an error of 0.8%, and the difference in instrument caused an error of 1.2%. Therefore, this novel simple quantitative detection method is effective and feasible, with high accuracy.

Key words: cotton fiber, cationization, acid dye, adsorption isotherm