沸石鞣剂和铬鞣剂复鞣对艾力特AT鞣革纤维吸收阴离子染料性能的影响

Effect of Zeolite and Chrome Retanning on the Absorption of Anionic Dyes by the KELINTAN REIT AT Tanned Leather Fibers

选用沸石鞣剂和铬鞣剂分别对有机鞣剂艾力特AT鞣制的白湿革进行复鞣处理,运用单因素变量法研究复鞣后的革纤维对阴离子染料直接兰80和酸性红249的吸收特性。使用扫描电子显微镜、物理吸附仪-比表面积分析仪、纳米粒度表面电位分析仪对复鞣后的革纤维松散程度及等电点进行表征,结果表明在沸石鞣剂和铬鞣剂复鞣体系下,艾力特AT鞣革纤维的等电点均由5.5提高到7.0左右,纤维比表面积增加且松散程度提高。这说明在艾力特AT鞣革的湿染整过程中,沸石鞣剂与铬鞣剂的复鞣化学机制相似。此外,复鞣后革纤维吸收阴离子染料的能力有所提升,吸收结合机制都以化学反应为主,吸收过程均符合二级动力学模型和Langmuir等温模型。研究结果可为无铬鞣体系鞣革的湿染整加工工艺制定提供理论支撑。

Zeolite tanning agent and chrome tanning agent,respectively,were used to retan the wet white prepared by using the organic tanning agent KELINTAN REIT AT.The absorption 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 REIT 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 REIT 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.