Effect of Zeolite and Chrome Retanning on the Absorption of An-ionic Dyes by the KELINTAN ? EIT AT Tanned Leather Fibers
Zeolite tanning agent and chrome tanning agent,respectively,were used to retan the wet white prepared by using the organic tanning agent KELINTAN ® EIT AT.The absorpt ion characteristics of the retanned leather fibers to the anionic dyes Direct Blue 80 and Acid Red 249 were investigated by using the one-way variable method.Scanning electron microscope,physical adsorption tester-specific surface area analysis,and nanoparticle size surface potential analyzer were used to characterize the retanned leather fibers,including fiber looseness and isoelectric point.Results showed that the isoelectric point of KELINTAN ® EIT AT tanning fibers increased from 5.5 to about 7.0,and the specific surface area of the fibers increased and the degree of looseness increased under both the zeolite and chrome retanning systems.It is concluded that the chemical retanning mechanisms of zeolite and chrome tanning agents are the same in the wet dyeing and finishing process of KELINTAN ® EIT AT tanned leather.Furthermore,the ability of leather fibers to absorb and bind anionic dyes was improved,and chemisorption was the main absorption and binding mechanism.The absorption process was in accordance with the laws of the secondary kinetic model and the Langmuir isothermal model.The results of this study provide theoretical support for the development of wet dyeing and finishing processes for chrome-free tanning systems.
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