Graphene Oxide Modified Dye Preparation and its Application in the Dyeing of Biomass-Derived Aldehyde-Tanned Chrome-Free Leather

Abstract

In this work, a graphene oxide (GO) modified small molecule reactive dye was prepared and further applied in the dyeing of the biomass-derived aldehyde tanning agent (BAT) tanned chromefree leather for clarifying its application properties. The modified dye (GORD) was prepared by introducing Reactive Red180 (RRD180) onto the surface of GO using the dehydration condensation method. GORD was characterized using FTIR spectroscopy, UVVis spectroscopy, and thermogravimetric analysis. The uptake ratios and the color fastness to sunlight of the GORDs were tested. FTIR and amino group consumption tests showed that RRD-180 was successfully grafted onto the GO lamellar structure, and the color rendering feature of the GORD was similar to that of RRD-180. The introduction of GO reduced the initial degradation temperature of GORD in the second stage (from 170ºC to 150ºC), but this did not affect the shrinkage temperature of the dyed leather. The uptake ratios of RRD-180 and GORDs were both higher than 90%, indicating that GO modification did not affect the reactive dye’s uptake by leather. Importantly, the coloring fastness to sunlight of the grain and flesh sides of the dyed leather was improved, indicating that the GORD endowed the dyed leather with a certain UV-shielding performance. This work provides new ideas for promoting the industrial applications of GO and GO-based functional materials in chrome-free leather manufacturing