Silicon-free and solid-free afterstain and application thereof

By improving the composition and formulation of the re-dyeing agent, and using a combination of cationic dispersant and fatty amine polyoxyethylene ether, the problems of strength reduction and time-consuming pretreatment of existing re-dyeing agents under high temperature and acidic conditions have been solved. Direct re-dyeing under strong alkaline and high temperature conditions has been achieved, improving production efficiency and dyeing uniformity.

CN117802802BActive Publication Date: 2026-06-19GUANGZHOU YINGKE CHEM TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGZHOU YINGKE CHEM TECH CO LTD
Filing Date
2024-01-15
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing dyeing agents cause a decrease in the strength of cotton knitwear and poor frost resistance under high temperature and acid conditions. The pretreatment steps are time-consuming, and the ability to prevent the shedding of soft oil, silicone oil or formaldehyde-free fixing agents is insufficient, limiting their application conditions.

Method used

The cationic dispersant is prepared by modifying castor oil polyoxyethylene ether with 3-chloro-2-hydroxypropyltrimethylammonium chloride. It is combined with fatty amine polyoxyethylene ether and anti-precipitant agents Pingpingjia O-25 and O-30 to form mixed micelles, which avoids the decrease in strength under high temperature and acid conditions, improves the freeze resistance, and prevents the soft oil or silicone oil from falling off during the re-dyeing process.

Benefits of technology

It enables direct re-dyeing without pretreatment at high alkaline temperatures, improving production efficiency, preventing the shedding of soft oil or silicone oil, preventing solidification, and ensuring dyeing uniformity and fabric quality.

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Abstract

This invention relates to the field of cotton knitted fabric dyeing technology, specifically to a silicone-free and fixative-free re-dyeing agent and its application. The silicone-free and fixative-free re-dyeing agent comprises the following components by weight percentage: 1-20% cationic dispersant, 5-25% fatty amine polyoxyethylene ether, 5-20% anti-settling agent, 5-20% diethylene glycol monobutyl ether, and water as the balance. When using the re-dyeing agent of this invention to re-dye cotton knitted fabrics, there is no need for steps such as fixative stripping, silicone stripping, or resin stripping. Simply add the re-dyeing agent to the dye bath; no pretreatment step is required, and re-dyeing and color correction can be performed directly. Furthermore, the re-dyeing agent of this invention can prevent the decrease in strength of cotton knitted fabrics under high-temperature and acidic conditions, has a stronger ability to prevent the shedding of soft oil, silicone oil, or formaldehyde-free fixing agents, and can also prevent auxiliaries from solidifying in low-temperature environments, thus improving the quality of re-dyeing.
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