Silk coated zinc oxide pillared montmorillonite dyeing with natural dyes from riceberry leaves

Abstract

In this study, zinc oxide pillared montmorillonite (ZnO-MMT) was prepared by impregnation method and hydrothermal reaction. The montmorillonite (MMT) clay was with Zn(NO₃)₂.6H₂O solution at 9%, 11%, 13% and 15% concentrations. It was then hydrothermal in ammonium hydroxide (NH₄OH) solution at 85°C for 24 hr to obtain zinc oxide pillared montmorillonite (ZnO-MMT). Silk was coated with zinc oxide pillared montmorillonite (ZnO-MMT) at various concentration. The physical properties of the coated silk
was characterized by using scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometer (FT-IR). The coated silk was dyed with natural dyes from riceberry leaves at 80°C, for
30 minutes and also mordanted with copper (II) sulphate, ferrous sulfate, potassium alum and calcium hydroxide. The color strength, color fastness, UV protection. The results showed that uncoated silk had a smooth surface, while the coated silk appeared zinc oxide pillared montmorillonite nanoparticles on the silk surface. This increases the surface area of silk fibers to absorb more dye molecules. Light fastness of uncoated silk and silk coated with ZnO-MMT at various concentrations average in level of 4-5 (good to very good) and washing fastness of 10 washed cycle was in level 4 (good). Ultraviolet Protection Factor is a scale to measure how much UV radiation passes through fabric to skin. A high UPF has better UV protection than a low UPF. Silk coated with 9ZnO-MMT had the highest UV protection capability with a UPF value of 44.86.