Views: 0 Author: Site Editor Publish Time: 2026-10-10 Origin: Site
Liquid Concentrated Soaping Agent is a high-performance auxiliary specifically developed by Zhejiang Kefeng Silicone for the post-dyeing and post-printing washing process of textiles. As a concentrated liquid formulation, this product is designed to efficiently remove unfixed dyes, hydrolyzed dyes, and residual chemicals from dyed or printed fabrics, thereby significantly improving color fastness, brightening the shade, and preventing back-staining.
Zhejiang Kefeng Silicone Co., Ltd. was established in 1993 and has grown into one of China‘s leading manufacturers of textile dyeing and finishing auxiliaries. The company has been recognized by the China Dyestuff Industry Association as one of the top five enterprises in the textile auxiliaries sector for comprehensive competitiveness, and its block silicone oil products have ranked among the top three in domestic market share for three consecutive years . Leveraging its deep expertise in surfactant chemistry and polymer design, Kefeng has developed this concentrated soaping agent to meet the demanding requirements of modern textile processing.
Soaping is a critical post-dyeing process that removes unfixed dye molecules and hydrolyzed dye from the fabric surface. Without effective soaping, these residual dyes can migrate back onto the fabric during subsequent washing or wear, causing color fading, staining of adjacent white areas, and deterioration of fastness properties.
The Liquid Concentrated Soaping Agent achieves its cleaning effect through a combination of mechanisms. The formulation contains specially selected surfactants and polymeric dispersing agents that work synergistically to solubilize and suspend residual dye molecules in the washing liquor. Once suspended, these dye particles are prevented from re-depositing onto the fabric through the action of anti-staining polymers that form a protective barrier around the dye molecules and create a repulsive interface with the fiber surface .
The concentrated liquid form offers a fundamental advantage over powdered soaping agents: rapid and complete dissolution in water at any temperature, with no risk of undissolved particles causing uneven treatment or localized staining. This ensures consistent performance across all processing conditions.
As a liquid concentrated product, this soaping agent contains a high proportion of active ingredients relative to its volume. This concentration translates directly into lower dosage requirements per liter of processing liquor, reducing shipping costs, storage space requirements, and overall chemical consumption. The concentrated nature of the product also minimizes packaging waste, aligning with the sustainability objectives of modern textile operations.
The product demonstrates superior dispersing capability, effectively breaking down agglomerated dye particles and maintaining them in a stable suspension throughout the soaping process . This dispersing action is particularly critical when processing tightly wound yarn packages or dense fabrics, where poor dispersion can lead to dye filtration and localized staining. The anti-staining effect ensures that white grounds in printed fabrics remain clean and that light-colored portions of multi-color designs are not contaminated by dye bleeding from darker areas.
For reactive dyeing, the most challenging contaminant to remove is hydrolyzed dye—dye molecules that have reacted with water instead of the fiber and thus possess no affinity for the substrate. The Liquid Concentrated Soaping Agent is specifically formulated to have high affinity for these hydrolyzed dye molecules, facilitating their transfer from the fiber surface into the washing liquor . This results in significant improvement in washing fastness and rubbing fastness, even for deep shades where conventional soaping may be insufficient.
Textile processing water often contains significant concentrations of calcium and magnesium ions, and dyeing liquors frequently contain high levels of electrolytes (salt). These conditions can cause precipitation of soaping agents and reduce their effectiveness. The Liquid Concentrated Soaping Agent is formulated to be stable in hard water and tolerant of high electrolyte concentrations, maintaining consistent performance regardless of water quality variations . This robustness reduces the need for water softening and simplifies process control.
Excessive foaming is a common problem in soaping processes, particularly in jet dyeing machines and continuous ranges where foam can cause fabric floating, uneven treatment, and pump cavitation. The Liquid Concentrated Soaping Agent is formulated to exhibit low foam characteristics, making it suitable for use in all types of dyeing and washing equipment, including jet machines, overflow machines, and continuous washing ranges .
Reactive dyes are the most widely used class of dyes for cellulosic fibers, but they require thorough soaping to remove hydrolyzed dye and achieve optimal fastness. The Liquid Concentrated Soaping Agent is particularly effective for reactive dyeings, enabling efficient removal of unfixed dye even in deep shades where conventional soaping may require multiple treatments. The product allows for shortened soaping cycles at high performance levels, contributing to energy savings and increased productivity .
For printed fabrics, soaping serves a dual purpose: removing thickener residues and unfixed dye from the printed areas, and preventing dye transfer to unprinted white grounds. The anti-staining properties of this product are especially valuable in printing applications, where any back-staining onto white areas is immediately visible as a quality defect . The dispersing action also aids in the removal of alginate and other thickeners used in print pastes.
Beyond reactive dyes, the Liquid Concentrated Soaping Agent is effective for soaping vat dyes, sulfur dyes, and naphthol dyes, all of which require thorough post-dyeing washing to remove unfixed colorant and achieve optimal fastness . The excellent dispersing effect allows for the best possible fastness results, particularly for dark vat dyeings where incomplete soaping can result in crocking and poor wash fastness.
Parameter | Typical Value |
|---|---|
Appearance | Yellow-brown to amber liquid |
Ionic nature | Anionic / Nonionic |
pH (1% solution) | 7.0 – 9.0 |
Solubility | Readily dispersible in water |
Foam tendency | Low foam |
Stability | Stable in hard water, acids, alkalis, and electrolytes |
The Liquid Concentrated Soaping Agent can be applied by exhaust method or continuous method, depending on the equipment and process requirements.
Exhaust Method (Jet/Overflow Machines):
Dosage: 0.5 – 2.0 g/L (depending on shade depth and dye class)
Temperature: 90 – 98°C
Time: 10 – 20 minutes
Process: After dyeing, rinse → neutralize → soap with the agent → rinse
Continuous Method:
Dosage: 1 – 3 g/L in the washing compartments
Temperature: 80 – 95°C
Suitable for open-width washing ranges
The product can be diluted with water at any ratio and added directly to the processing bath. For optimal results, the pH of the soaping liquor should be adjusted to the neutral to slightly alkaline range.
Zhejiang Kefeng Silicone operates under a comprehensive quality management system, with production facilities covering an area of over 100 acres and an annual production capacity of 1,000 tons of crude block silicone oil . The company maintains an efficient research and development team and continuously develops new products and technologies to meet the evolving requirements of the textile industry . All products are subjected to rigorous quality control before shipment, ensuring batch-to-batch consistency and reliable performance.
The Liquid Concentrated Soaping Agent from Zhejiang Kefeng Silicone represents a modern, efficient solution for the post-dyeing washing of textiles. Its concentrated liquid form ensures ease of handling and dosing, while its advanced surfactant and polymer formulation delivers excellent dispersing, anti-staining, and dye-removal performance. By improving color fastness, preventing back-staining, and enabling shortened processing cycles, this product supports textile manufacturers in achieving higher quality standards while reducing water, energy, and chemical consumption. Backed by Kefeng’s three decades of expertise in textile auxiliary chemistry and its reputation for innovation and quality, this soaping agent is a dependable choice for dyehouses worldwide.
