Method for dyeing by using vat dye in overflow dyeing machine

The dye premix formed by cross-linking modified cationic starch with vat dyes solves the problems of uneven dye uptake and poor light fastness in vat dye overflow dyeing, and improves dyeing uniformity and light fastness, thereby improving the quality of dyed products.

CN122082268APending Publication Date: 2026-05-26ZIBO XINGWEI SUPPLY CHAIN MANAGEMENT CO LTD
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Patent Information

Application Number
CN202610485234.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-14
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The existing vat dye overflow dyeing process suffers from problems such as uneven dyeing, color difference, and poor light fastness. In particular, the poor compatibility between starch-based dyeing auxiliaries and dyes makes it difficult to improve the dyeing effect.

Method used

A dye premix was formed by crosslinking modified cationic starch with vat dye. Through electrostatic adsorption and crosslinking reaction, a stable and uniformly dispersed dye premix was prepared, which improved the binding of dye and fiber and formed a protective film to enhance dyeing uniformity and lightfastness.

Benefits of technology

It significantly improves dyeing uniformity and light fastness, ensures consistency in dyeing of fabrics in the same batch, enhances the binding stability of dye and fiber, avoids fading, and is compatible with the dyeing characteristics of overflow dyeing machines.

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Abstract

The invention provides a method for dyeing by an overflow dyeing machine through vat dye. The use of the dye premix greatly improves the dyeing performance, the cationic characteristic of the modified cationic starch and fabric fibers generate electrostatic adsorption, so that the coated dye particles are quickly and uniformly attached to the surface of the fabric, local color difference caused by non-uniform dispersion of the dye in a dye bath is avoided, local aggregation of the dye cannot be caused by water flow impact of overflow dyeing, and the dyeing quality is improved. The dyeing uniformity is effectively improved, and the dyeing effect of the same batch of fabrics is consistent. A stable structure formed by crosslinking the modified cationic starch and the vat dye forms a protective film on the surface of the fabric fiber after color fixation, so that the combination stability of the dye and the fiber is enhanced, the damage of external factors such as illumination to dye molecules is reduced, the light resistance of the dye and the light fastness of the fabric are improved, and the combination of the dye and the fiber is firmer due to the film-forming property of the dye; and color fading is avoided.
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