A Dyeing Process for Improving the Light Fastness of Gray-blue Perspiration of Pure Cotton Fabric

Abstract

The invention discloses a dyeing process capable of increasing grey blue perspiration-light colorfastness of pure-cotton fabric. The dyeing process sequentially includes steps: vat dye suspension dispersing liquid dyeing, primary drying, primary color fixing, primary washing and drying, active dye liquid over dyeing, secondary drying, secondary color fixing and secondary washing and drying. The dyeing process has the advantages that vat dyes are used first to perform primary dyeing on the pure-cotton fabric until the fabric is dyed to the depth of 70-80%, reduction liquid can allow the vat dyes to convert into leuco body dyes with affinity to the pure-cotton fabric, the dyeing of the pure-cotton fabric is completed under a steaming condition, the leuco body dyes are oxidized into color precipitate deposited on the pure-cotton fabric by the aid of oxygen in the air after washing oxidation, then active dyes are used to perform over dyeing on the primarily dyed pure-cotton fabric, and accordingly the sun and perspiration-light colorfastness of the grey blue pure-cotton fabric can reach level 3 to level 4, LOL color is small before and after the dyeing, and lateral and middle color difference is stable.

Description

technical field [0001] The invention relates to the technical field of textile fabric printing and dyeing, in particular to a dyeing process for improving the gray-blue perspiration fastness of pure cotton fabrics. Background technique [0002] Pure cotton woven fabrics are usually dyed with reactive dyes and vat dyes. The dyeing equipment is mainly continuous pad dyeing, supplemented by overflow dyeing machines and jiggers. Continuous pad dyeing has the characteristics of high efficiency, uniform dyeing, and small LOT color (color difference between pieces), which is suitable for mass production, while overflow dyeing machines and jiggers have large tank differences and low production efficiency. Continuous pad dyeing equipment can be dyed with reactive dyes and vat dyes, while intermittent equipment such as overflow machines are only suitable for dyeing with reactive dyes. [0003] Because reactive dyes have a wide color spectrum, cotton fabrics are often dyed with reacti...

AI Technical Summary

Problems solved by technology

Vat dyes have inherent advantages in these two indicators, but because of their narrow chromatographic range, they cannot dye brighter dark blue

If you choose a reactive blue dye with high light fastness, it is difficult to find a good combination of red and yellow dyes that match it. The continuous dyeing of pure cotton woven fabrics may have various color differences between the lot color and the side. , and the repair and over-dyeing also brought a lot of troubles. In order to solve the above contradictions, this case arose