Superheated water hydrolysed keratin: a new application in dyeing of fabrics
| Autor: | Zoccola M., Bhavsar P.S., Patrucco A., Montarsolo A., Mossotti R., Pozzo P.D., Tonin,C. |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | IWTO 88th Congress, Venice, Italy, April 9-11 info:cnr-pdr/source/autori:Zoccola M., Bhavsar P.S., Patrucco A., Montarsolo A.; Mossotti R., Pozzo P.D. and Tonin,C./congresso_nome:IWTO 88th Congress/congresso_luogo:Venice, Italy/congresso_data:April 9-11/anno:2019/pagina_da:/pagina_a:/intervallo_pagine |
| Popis: | A large amount of wool produced in the European region is coarse and of low quality. The limited or nonutilization of such coarse wool leads to landfilling causing environmental pollution. The chemical transformation of wool carried out was based on a green economically sustainable hydrolysis treatment using superheated water. The hydrolyzed product was analyzed using amino acid analysis and molecular weight distribution. Both the amino acid and molecular weight distribution analysis revealed that the wool was completely degraded and the hydrolyzed product contains a low molecular weight proteins and amino acids. Then, we studied the properties of this keratin hydrolyzate, to be used as a foaming agent in foam dyeing of cotton and wool fabrics. We report the use of keratin hydrolyzate as a foaming auxiliary in the textile dyeing process. The surface tension, foam stability, blow ratio, and bubble size of keratin hydrolyzate in aqueous solutions with and without dyeing auxiliaries were determined. The dyeing influential parameter such as wet pickup was studied to identify their effect on dye fixation and color strength. The foam dyeing was compared with conventional cold-pad batch and pad-steam processes for cotton and wool, respectively. In the investigated variant, keratin hydrolyzate shows a reduction in surface tension, good foam stability along with dyeing auxiliaries, a blow ratio of about 10:1, and 0.02-0.1 mm diameter bubble sizes. These results make possible its application as a foaming agent. Cotton and wool fabrics were dyed using reactive and acid dyes respectively, on a horizontal padding mangle. In both cases, hydrolyzed keratin acts as a carrier for dye molecules and the mechanism of dyeing depends on the respective pH of the dye solution, keratin, and fiber. Foam dyeing of cotton resulted in comparable color strength, while wool shows higher color strength when compared with conventional dyeing processes. Washing and rubbing fastness of cotton and wool foam dyed fabrics are similar to the respective conventional dyed fabrics. The combinations of sustainable keratin hydrolyzate production and its use as an eco-friendly, biodegradable foaming agent in less add on foam dyeing technology resulted not only in saving of large amounts of water and energy but also will be helpful in minimizing a load on effluent and the environment. A new approach of coloration of wool was also tried using wool hydrolysate as a color in a dying bath and different shades were obtained using mordants. |
| Databáze: | OpenAIRE |
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