A method for dyeing true silk fabric with madder and a dyed true silk fabric prepared thereby

By using citric acid for color locking and synergistic film formation with tannins, the problems of low purity of marshmallow pigment and easy damage to silk fabrics under high temperature and alkaline treatment are solved. This achieves a multi-functional integrated effect of high rubbing fastness, natural sun protection and flame retardancy, while preserving the luster and feel of silk fabrics.

CN122428529APending Publication Date: 2026-07-21CHENGDU HUIXIN IND DESIGN CO LTD
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Patent Information

Application Number
CN202610743696.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-27
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The existing hollyhock pigment has low purity and insufficient color fastness. Silk fabrics are easily damaged when treated under alkaline or high temperature conditions. Furthermore, flame retardancy and sun protection rely on chemical auxiliaries, resulting in uneven dyeing, grayish color, low rubbing fastness, and poor safety.

Method used

After dyeing with high-purity marshmallow pigment stock solution, citric acid is used to lock in the color and anchor the anthocyanins. The film is then formed by the synergistic action of tannins from pomegranate peel and gallnut extract, creating a gradient flame-retardant protective layer that integrates color fixation and sun protection.

Benefits of technology

Under mild conditions, it achieves high rubbing fastness, natural sun protection and flame retardancy for silk fabrics, while retaining the luster and soft feel of silk.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a method for dyeing real silk fabric with hibiscus and dyed real silk fabric prepared by the method, and belongs to the technical field of natural plant printing and dyeing. The method comprises the following steps: immersing real silk fabric in a dyeing solution prepared by mixing high-purity hibiscus pigment stock solution with anthocyanin and tannin active ingredients; immersing the dyed fabric in a citric acid aqueous solution for color fixing treatment; immersing the color-fixed fabric in a fixing solution composed of pomegranate peel extract and gallnut extract for double-tannin fixing and film sealing treatment; and finally, washing and air-drying to obtain the dyed real silk fabric. Through the synergistic effect of citric acid color fixing anchoring anthocyanin molecules and double-tannin gradient self-crosslinking film forming, the real silk fabric is endowed with excellent rubbing color fastness, natural sunscreen and natural flame retardant properties under the conditions of no chemical mordant, no chemical flame retardant and no chemical anti-ultraviolet finishing agent. Meanwhile, the original gloss, drape and soft hand feeling of the real silk fabric are preserved.
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