Technology for dyeing linen-cotton fabric by using indigo pigment

Abstract

The invention relates to technology for dyeing linen-cotton fabric by using indigo pigment. The dyeing technology comprises the following steps: (1) putting a linen-cotton fabric in a high-temperature water bath with an alkali agent, a reductant and a refining agent dissolved for refining, putting the refined fabric in a high-temperature water bath with an oxidant and an oxidation control agent dissolved for oxidation, and washing the oxidized fabric with a detergent and water at a high temperature; (2) putting the pre-treated fabric in a dyeing liquid with a dispersant, an alkali agent and a reductant dissolved for dyeing, and adding an accelerating agent and a coloring stabilizer to the dyeing liquid during a dyeing process; (3) leaching the dyed fabric with a sodium bicarbonate solution; (4) putting the leached fabric in a water bath with an oxidant and an oxidation control agent dissolved for oxidation; (5) washing the oxidized fabric with acid; and (6) soaping the acid-washed fabric at high temperature, taking the soaped fabric out, washing the obtained fabric and performing natural airing. According to the indigo pigment dyeing technology, the fabric is provided with high dye up-taking rate, is good in wear fastness and washing fastness, and facilitates automatic operation.

Description

technical field [0001] The invention belongs to the technical field of finishing and dyeing of textile materials, and mainly relates to a method for dyeing cotton and linen fabrics dyed with biological indigo pigment. [0002] technical background [0003] Indigo is a vat dye with a history of more than 3,000 years and one of the earliest discovered natural dyes. It is the most important blue dye in ancient my country. Indigo is a dark blue solid, slightly soluble in water, ethanol, glycerin and propylene glycol, but insoluble in oil; it is mainly used for coloring food, medicine and daily cosmetics. [0004] The textiles produced by plant indigo dyeing are safe for the human body and the environment. Generally, they are Chinese herbal medicines with certain curative effects. While dyeing, they can endow the fabric with certain health care functions, such as natural fragrance, heat clearing, cooling blood, detoxification, refreshing and brain strengthening. Therefore, its ap...

AI Technical Summary

Problems solved by technology

The reducing agent in the indigo reduction process is mainly the hydrogen produced by fermentation, and the technology that has been studied more at present is to use hydrosulfite and thiourea dioxide as the reducing agent, but the instability of the reducing agent itself and some difficult to determine technical parameters make the dyeing process The environmental requirements are high, it is difficult to apply industrially, and the corresponding color fastness has not reached the grade standard set by the state. Therefore, the research on the dyeing process of biological indigo to cotton and linen is very important for the industrial production of indigo dyeing and the improvement of color fastness. especially necessary