Technological method for dyeing wool tops through plant indigo dye

Abstract

The invention discloses an extraction technology of extracting plant indigo from baphicacanthus cusia bremek leaves and a dyeing technology of top dyeing of wool fiber tops through the plant indigo. The technology comprises the steps that collected baphicacanthus cusia bremek leaves are cleaned thoroughly, impurities are removed, after natural airing or drying at low temperature is conducted, the baphicacanthus cusia bremek leaves are smashed in a pulverizer, and baphicacanthus cusia bremek leaf plant powder dregs are obtained; a mixed solution of ethyl alcohol and water is poured into the baphicacanthus cusia bremek leaf plant powder dregs, and a plant indigo extracting solution is obtained through ultrasonic treatment; high-speed centrifugation is conducted on the extracting solution, vacuum concentration and drying are conducted after the impurities are removed, and plant indigo powder is obtained; the plant indigo powder is dissolved in soft water, caustic soda and sodium hydrosulfite are sequentially added, the mixture is stirred evenly and added into a top dyeing dye vat, and wool tops to be dyed are completely immersed; the temperature rises to start dyeing, and after heat preservation is conducted for a certain period, the wool tops are taken out of dye liquor to be dewatered; the wool tops are moved into an air blower rapidly, and oxidation is conducted on the wool tops through air which flows at a high speed till the wool tops turn blue from yellow green; the wool tops are put back into the dye vat, soaping is conducted, washing is conducted through clear water after soaping, drying is conducted, and the the wool tops dyed through the plant indigo are obtained.

Description

technical field [0001] The patent of the invention belongs to the technical field of wool fiber dyeing, and in particular relates to a wool fiber strip dyeing process using plant indigo. Background technique [0002] Acid mordant dyes have been used in the wool spinning industry for many years. The hazards of acid mordant dyes include: the pollution of hexavalent chromium ions in dyeing wastewater to the environment; the second is the existence of extractable chromium ions on the dyed fibers, which is seriously harmful to the human body; the third is to prevent the discarding of waste materials after dyeing pollution of the environment. When used for wool dyeing, due to hexavalent chromium ions, it must be reduced to trivalent in order to complex with dyes. During the oxidation-reduction process, the wool is seriously damaged. As a result, the strength of the wool fiber is reduced, the color is yellowed, the spinnability is greatly reduced, and the quality of the yarn is r...

AI Technical Summary

Problems solved by technology

During the oxidation-reduction process, the wool is seriously damaged. As a result, the strength of the wool fiber is reduced, the color is yellowed, the spinnability is greatly reduced, and the quality of the yarn is reduced. Even put a heavy burden on Shubu

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