Extraction of natural dyes from Alpinia blepharocalyx K. Schum. for dyeing of silk fabric |
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Authors: | Chunxia Wang Changhai Xu Anli Tian Shaohai Fu Chaoxia Wang |
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Affiliation: | 1. Key Laboratory for Eco‐Textile of Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, China Email: shaohaifu@hotmail.com;2. Department of Textile Engineering, Chemistry and Science, Fiber and Polymer Science Program, North Carolina State University, Box 8301, Raleigh, NC 27695, USA |
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Abstract: | Natural dyes were extracted from the leaves and stems of Alpinia blepharocalyx K. Schum. Analysis of the designed experiment revealed that extraction at a plant/water ratio of 1:20 could reach an optimal production of natural dyes when extraction was performed at 80 °C, for 4 h, under 20 min ultrasound, in the presence of 10 g/l sodium hydroxide, and with two extractions. The extracted natural dyes were applied to the dyeing of silk fabrics using different methods, including or excluding a mordant. It was found that mordants had a significant effect on the colour of dyed silk fabrics. The silk fabric dyed with the pre‐mordant method using potassium aluminium sulphate as a mordant showed a bright yellow with a higher colour strength. The optimal dyeing conditions were reached when the extracted natural dyes were pre‐mordanted with 10 g/l potassium aluminium sulphate at pH 6, and for a 20 min dyeing time. |
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