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Chlorine-Resistant Cotton Fixing Agent Sylic D2825: Enhancing Color Fastness and Chlorine Resistance of Cotton Fabrics

Views: 55 Author: Site Editor Publish Time: 2026-07-15 Origin:

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Introduction

In textile dyeing, improving the color fastness of cotton fabrics while maintaining excellent chlorine resistance has always been a key challenge, especially for products exposed to frequent washing, bleaching agents, or chlorinated water environments.

Sylic D2825 Chlorine-Resistant Cotton Fixing Agent is a high-performance cationic fixing agent specially developed for reactive dye-dyed cotton and linen fabrics. It not only improves washing fastness and wet/dry rubbing fastness but also provides outstanding resistance against chlorine bleaching, helping fabrics maintain their original color appearance during use.

With excellent environmental performance and application stability, Sylic D2825 is an ideal solution for high-quality cotton textile finishing.

Product Information

Product Name:

Chlorine-Resistant Cotton Fixing Agent Sylic D2825

Chemical Composition:

Epichlorohydrin-dimethylamine copolymer

Appearance:

Amber transparent liquid

pH Value (1% aqueous solution):

4.0–5.0

Ionicity:

Cationic

Solubility:

Miscible with water in any proportion

Key Performance Features

1. Excellent Chlorine Resistance

Compared with conventional fixing agents, Sylic D2825 provides significantly improved chlorine resistance. Fabrics treated with D2825 can effectively maintain color stability when exposed to chlorine-containing environments, such as swimming pools, repeated bleaching processes, and chlorine-based cleaning conditions.

2. Improved Color Fastness

Sylic D2825 effectively enhances:

Washing fastness
Wet rubbing fastness
Dry rubbing fastness
Water immersion fastness

It helps reduce dye bleeding and improves the overall durability of dyed cotton fabrics.

3. Environmentally Friendly Formula

Sylic D2825 is:

Phosphorus-free
APEO-free
Energy-saving and consumption-reducing

It supports cleaner textile production and reduces environmental impact during wastewater treatment.

Working Mechanism

During the fixing process, Sylic D2825 reacts with reactive dye-dyed cotton fabrics and forms a stable bonding structure through chemical interactions.

Unlike conventional fixing agents, the active components of Sylic D2825 can preferentially react with chlorine ions or hypochlorous acid when fabrics are exposed to chlorine-containing environments.

This protective mechanism helps:

Prevent chlorine from attacking dye chromophores
Reduce dye decomposition caused by chlorine oxidation
Maintain the original color shade of dyed fabrics
Improve chlorine fastness performance

As a result, fabrics treated with Sylic D2825 achieve longer-lasting color durability.

Application Fields

Sylic D2825 is mainly applied for:

Reactive dye fixing treatment of cotton fabrics
Cotton knitted fabric finishing
Cotton and linen dyeing processes
Fabrics requiring chlorine resistance, such as swimwear, towels, uniforms, and frequently washed textiles

Application Method

1. Exhaust Dyeing Method

Reference dosage:

(Based on 20% solid content)

Chlorine-resistant fixing process for cotton and linen fabrics

Fabric Shade	Dosage	Treatment Condition
Light colors	1.0–2.0% o.w.f.	40–50℃ × 20 min
Medium & dark colors	2.0–3.0% o.w.f.	40–50℃ × 20 min

2. One-Bath Process with Softener

Sylic D2825 can also be applied in the same bath with cationic or nonionic softeners.

Recommended dosage:

Fabric Shade	Dosage
Light colors	5–20 g/L
Dark colors	10–30 g/L

Dosage can be adjusted according to fabric color depth and required performance.

Performance Evaluation

Chlorine Fastness Test

Testing Standard: ISO 105-E03-1994

Available Chlorine Concentration: 50 ppm

Product	Dosage	Chlorine Fastness Rating
Sylic D2825	10 g/L	4
Sylic D2825	20 g/L	4–5
Conventional Fixing Agent	10 g/L	3+
Conventional Fixing Agent	20 g/L	2–3

Test Result:

The results demonstrate that Sylic D2825 provides excellent chlorine resistance. Increasing the dosage improves chlorine fastness, while conventional fixing agents may show decreased chlorine resistance at higher dosages.

Washing Fastness Performance

Wash fastness (refer to standard GB/T 3921.3-1997)

Additives	Dosage (g/L)	High dosage
Sylic D2825	10.0 g/L	20.0 g/L

Wash fastness test of black cotton knitwear:

Water Immersion Fastness Performance

Test Conditions:

Liquor ratio: 1:30
Detergent concentration: 5 g/L
Temperature: 98℃
Treatment time: 10 min

After treatment with Sylic D2825, the residual liquid from red cotton fabric showed significantly reduced coloration, indicating excellent dye fixation performance.

The fixing effect improved with increasing dosage.

As shown in the figure, after being treated with D2825 chlorine-resistant color-fixing agent, the color of the residual liquid in the water bubble of the red cotton fabric became significantly lighter, and the color-fixing effect improved with the increase of the amount used.

Conclusion

With increasing requirements for durable and high-performance textiles, chlorine-resistant finishing has become increasingly important for cotton fabrics.

Sylic D2825 Chlorine-Resistant Cotton Fixing Agent provides an effective solution by combining excellent fixing performance with superior chlorine protection. It helps textile manufacturers produce cotton fabrics with longer-lasting color, improved durability, and enhanced customer satisfaction.

Keywords:

Chlorine-resistant fixing agent, cotton fixing agent, reactive dye fixing agent, chlorine fastness improvement, cotton textile finishing, dye fixing agent, textile auxiliaries, color fastness enhancer