Abstract

Wet-chemical processing of textile substrates starting from its preparatory to dyeing/printing followed by finishing is important for its value addition in terms of aesthetic value, removal of impurities, colour shade, colour pattern and requisite functionality. However, some of the traditional processes are water, energy and chemical intensive. In the recent time, due to global awareness on environmental pollution, climate change, global warming, carbon footprint and sustainability, both the academic research and industrial product development have been intensified to seek for sustainable dyeing and finishing processes, using biomacromolecules, biomaterials, plant extract, biopolymer and water-free technologies. In this context, deoxyribonucleic acid (DNA) from herring sperm, whey proteins, casein, chicken feather protein (CFP), banana pseudostem sap (BPS), spinach juice (SJ) and green coconut shell extract (GCSE) has been explored for improving the thermal stability of cellulosic, lignocellulosic and protein substrates. Similarly, agro-waste, nanolignin, silk sericin and aloe vera have been successfully extracted and applied in textile substrates to protect its user from the harmful ultraviolet (UV) rays. The above natural ingredients and a few more from marigold, manjistha, annatto, neem, turmeric, sandalwood, tulasi, jasmine, lemon, lavender and sandalwood have also been explored for natural dyeing, UV protective, aroma and antimicrobial finishing of textile. Water-less plasma and UV treatment can also be used as a pre-treatment, post-treatment, in situ reaction or post-polymerization for surface activation, oxidation, etching, polymerization, coating and deposition to impart value-added functionalities, such as water and oil absorbency, water and oil repellency, flame retardancy, UV protection, anti-static property and dyeing of various textile substrates.

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