Phenolic-Free Acidic Fixing Agents

What are Acidic Fixing Agents?

In textile dyeing and finishing processes, acidic fixing agents are important auxiliaries used to improve the color fastness of dyed fabrics. They primarily work by forming a stable bond with the dye on or within the fiber surface, thereby reducing color fading during washing, friction, and perspiration. Acidic fixing agents are widely used in the finishing processes of protein fibers such as nylon, wool, and silk, as well as some synthetic fibers, and are one of the key chemicals for improving product quality and stability.

Why Choose Phenolic-Free Fixing Agents?

With increasingly stringent environmental regulations and rising demands from international brands for sustainable supply chains, traditional phenolic fixing agents are facing growing restrictions. Phenolic-free acidic fixing agents do not contain phenol or restricted substances such as bisphenol A, bisphenol S, and bisphenol F, effectively reducing potential risks to human health and the environment. Furthermore, they comply with international environmental standards such as ZDHC and OEKO-TEX®, making them more suitable for export orders and the production needs of high-end brand textiles, representing an important direction for the industry’s green upgrade.

Sylic G575 Product Recommendation

Sylic G575 is a high-performance, phenol-free acidic fixing agent developed using an aromatic sulfonate polymer system. It is a brownish-black, transparent, viscous liquid. This product is suitable for various fiber systems, including nylon, wool, and silk. It effectively improves wash fastness and soaping fastness while having minimal impact on color, making it suitable for printing and functional dyeing products.

Product Information  

 Composition: Aromatic sulfonate polymer

Appearance: Brown-black transparent viscous liquid (with green tint)

Ionicity: Anionic

pH: 4 ± 1 (1% aqueous solution)

Solid content: 38 ± 2

Brix: 45 ± 1

 Product Properties

1. Phenol-free acidic fixing agent
2. Suitable for improving color fastness of nylon, wool, silk and other fabrics
3. Free from bisphenol and phenol residues; ZDHC certified; compliant with OEKO-TEX® and other environmental standards

 Performance Advantages

1. Completely free from bisphenol A/S/F/AF/B, phenol, and other restricted substances
2. Excellent water-soaping and wash fastness
3. Minimal color change; suitable for fixing printed and fluorescent fabrics

Bisphenol Residue Test Results

Application Scope

Suitable for improving color fastness of nylon, wool, silk fabrics and for high-end brand customization

Application Effects

1.G575 Color Change Test

Process: Impregnation, 80°C × 20 min

Dosage: 3%, Liquor ratio 1:10

Test Standard: Tested using a Datacolor spectrophotometer

Note: K/S represents color depth. The higher the K/S value, the deeper the shade.

Δa: Represents the red-green axis. “+” indicates redder, “−” indicates greener.

Δb: Represents the yellow-blue axis. “+” indicates yellower, “−” indicates bluer.

ΔE: Represents total color difference. The higher the value, the greater the color difference.

2.G575 Water-Soaping Test

Process: Impregnation, 80°C × 20 min

Dosage: 2%, Liquor ratio 1:10

Test Standard: Liquor ratio 1:20, 5 g/L detergent, 70°C × 3 min

3.G575 Wash Fastness Test

Process: Impregnation, 80°C × 20 min

Dosage: 2%, Liquor ratio 1:10

Test Standard: In accordance with ISO 105-C06 C2S

4.G575 Perspiration Fastness Test

Process: Impregnation, 80°C × 20 min

Dosage: 2%, Liquor ratio 1:10

Test Standard: In accordance with ISO 105-E04

Get a free sample 

Customers interested in Sylic G575 are welcome to contact us :info@sylicglobal.com to obtain a free sample for testing. We will provide you with professional technical support and application advice to help you quickly verify product effectiveness and optimize your actual production process.