Abstract
In this study, dyeing Mongolian cashmere with bio-preparation extracted from Urtica cannabina L. was investigated. Dyeing experiments were carried out under varying pH, temperature and contact time. The results have been used to investigate the kinetic and thermodynamic parameters of dyeing cashmere. This process is pH dependent and it has been found that the most suitable condition is pH 4.5. Increase in adsorption capacity with increase in temperature indicates that the dyeing process is endothermic. Thermodynamic parameters like standard affinity (∆µ), standard enthalpy (∆H) and standard entropy (∆S) were evaluated.
Highlights
Cashmere is a natural fibre taken from the cashmere down
The best result of dyeing the cashmere was achieved using a temperature of 800C, pH 5.0, 60 minutes and initial dye concentration of extracted by water with an ML ratio of 1:30
There will be an increase in dye absorption with an increase in temperature of dyeing after which the dyeing process slows down and dye adsorption at a certain temperature where equilibrium of dyeing is achieved
Summary
Cashmere is a natural fibre taken from the cashmere down. It is one of the most luxurious and rare fibres. Cashmere yarn is renowned for being light, airy, delicate, glossy and its warmth. Thanks to these properties, cashmere is used as a raw material for luxury woven or knit products. Around 30.0% of the world cashmere is produced in Mongolia. The process of producing a cashmere apparel includes a number of steps starting with fibre preparation to garment processing. Among the many production steps, dyeing is essential in order to produce cashmere garments, especially with natural dyeing for “Eco-organic product” [4]. Natural dyes neither cause pollution nor waste water problems
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