Effect of ultraviolet absorbers and dyeing on ultraviolet protection through mercerized cotton fabric
Loading...
Date
2018
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Punjab Agricultural University, Ludhiana
Abstract
The present study entitled “Effect of ultraviolet absorbers and dyeing on ultraviolet protection through mercerized cotton fabric” was carried out in Punjab Agricultural University, Ludhiana. The study was conducted to explore the effects of application of benzophenone UV absorbers in combination with reactive dyes on mercerized cotton fabric. Benzophenone-6 and Benzophenone-2 were selected for the UV treatment of the fabric. UV treatment conditions were optimised on the basis of ultraviolet protection factor (UPF). Treatment parameters optimized for both UV absorbers included Na2CO3 pre-treatment pH, treatment temperature, treatment time and UV absorber concentration. Pre-treatment at pH of 10 at 700C temperature found optimum for Benzophenone-6. For Benzophenone-2 optimum results were obtained at pre-treatment pH of 11 at temperature of 750C. Both UV absorbers gave best results when UV treatment was done for 35 minutes using 2% concentration. For dyeing, four hot reactive dyes and four cold reactive dyes were selected. Dyeing parameters optimized included dyeing pH, temperature, time and dye concentration. The conditions were optimized on the basis of CIE Lab and K/S values. The results revealed that for cold reactive dyes optimum pH was found between 9-10 pH and for hot reactive dyes optimum pH was observed between 10-11 pH. For all the hot reactive dyes optimum temperatures was found to be 800C.Optimum dyeing was achieved when dyeing was done for 60-70 minutes for all the reactive dye. Optimized dye concentration for all the dyes was 5%. After dyeing and treatment, the samples were assessed for physical, mechanical and comfort properties. Subsequent to UV treatment and dyeing, Colour fastnesses properties and effect of consecutive laundering on UV treated-dyed fabric was also studied. Both the UV absorbers provided acceptable levels of ultraviolet protection. Highest UPF rating was achieved for sample dyed with Reactive Red 120 dye in combination with Benzophenone-6. Significant changes in physical properties were recorded but it did not affect fabric’s appearance negatively. For mechanical properties, an increase in % elongation was observed but it did not affect dyed-UV treated fabric’s strength negatively. Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) analysis of control fabric and untreated-dyed fabrics were performed to assess the morphological changes and chemical changes, respectively.
Description
Keywords
null