Unconventional Natural Dyeing Using Microwave Heating with Cochineal as Natural Dyes

Abstract

This research concerns making wool fabrics with dye extracted from cochineal using microwave heating. The result shows good fastness properties. To promote value addition in domestic processing and to boost rural income and employment in small-scale agroenterprises, it is necessary to promote non-polluting natural dyes, which involve inexpensive equipment and small-scale operations. The exploration of new flora can be environmentally and economically viable. Our aim is to show the feasibility of providing high-quality natural dyes extracted from insects, thus improving our environment and giving opportunities to the fabric industry to catch up with the current consumer trends towards more aesthetic fabrics and natural products. We investigate cochineal as a natural dye using microwave irradiation under different factors such as dye extraction, the pH level of dye bath, dyeing time, dye concentration, microwave power level and mordants, and compare the results with those obtained using traditional heating. The dye extraction indicates that microwave heating is a more effective method than traditional heating. The kinetic parameters are examined to determine half-dyeing time (t½), dye affinity (Δµ°), dye rate constant (K) and heat content (ΔH).

Advances in the finishing of silk fabrics

“…Their main disadvantage lies in the order of magnitude of their extraction yield factors (a few grams of pigment per kilogram of dried raw material). To overcome this limitation, it has been suggested that other biological sources be exploited, such as fungi (both molds and yeasts), bacteria, algae, and plant cultures, since appropriate selection, mutation, or genetic engineering techniques are likely to significantly improve the pigment production yields with respect to wild organisms (Elshemy, 2011). Among the several pigment-producing microorganisms described in the literature, the fungus "Thermomyces" has been thoroughly studied (Palanivel and Vellingiri, 2009).…”

Use of Sustainable Energy as a Heating Source to Improve Dyeability and Other Properties of Wool and Polyamide-6 Fabrics with Nano-Silica

“…Many researchers deliberated some new techniques and methods for saving time, water as well as energy [16,17] . Microwave irradiation, has been confirmed to be more rapid, uniform, efficient, and it can be used as alternative to conventional heating source [18,19] . Microwave irradiation can implement easily inside the fabric's particles, can be heated simultaneously, consequently reducing heat transfer problems.…”

Mengen’de Yetişen Bazı Yabani Mantar Türlerinin Doğal Boya Kaynağı Olarak Değerlendirilmesi

“…2011). Araştırmacılar, doğal boyarmaddelerin uygulamalarına ait ultrasonik enerji, mikrodalga enerjisi ve süperkritik karbondioksit ile boyama gibi birçok yeni yöntem geliştirmişlerdir (Vankar ve Shanker,2006;Elshemy 2011;Liu ve ark. 2018;Shahid ve ark.…”