Polyester(PET) fibers are widely used in apparel, home textiles, and industrial fabrics due to their excellent wear resistance, strength, and dyeability. However, during the dispersed dyeing process, polyester is highly susceptible to issues such as dye migration, contamination of white areas, and uneven color on pieced fabrics. As a leading manufacturer of textile auxiliaries, we offer you an efficient polyester dye-resist agent to ensure product quality and improve the dyeing yield
Common Issues in Polyester Dyeing
Under high-temperature and high-pressure dyeing conditions, dispersed dye molecules tend to migrate in the dye liquor and adhere to non-target areas, causing the following problems:
- White Ground Contamination: In pieced fabrics, the white parts are prone to contamination from dark dyes.
- Color Mottle and Spots: Uneven dye migration leads to uneven color on the fabric surface.
- Re-dyeing Issues: Incomplete washing after dyeing allows dyes to be reattached.
- Poor Batch Stability: Due to improper control of dye migration, the quality of each dyeing batch fluctuates significantly.
These issues not only affect the appearance of the finished product but also increase the costs of rework and scrap.
Mechanism of Action of Polyester Dye-Resist Agent
Polyester dye-resist agents primarily function through the following mechanisms:
1. Preventing Dye Re-adsorption: During the reduction cleaning process, they form stable complexes with dispersed dyes, keeping them suspended in the dye liquor and preventing re-adsorption.
2 . Dispersing and Sealing Dye Molecules: By dispersing and chelating, they inhibit the migration of already dyed dyes.
3. Improving Hydrophilicity: Enhancing the hydrophilicity of the polyester surface reduces the affinity between dyes and fibers.
4 . Assisting Soaping: Working in conjunction with reduction cleaning or post-soaping processes to enhance the removal of floating dyes.
How to Choose the Right Polyester Dye-Resist Agent?
When selecting a polyester dye-resist agent, consider the following:
| Item | Suggested Parameters or Characteristics |
| Dispersibility | Stable dispersion under high-temperature and high-pressure conditions |
| Compatibility | Usable in combination with reducing agents, soaping agents, etc., in the same bath |
| Anti-contamination Effect | Good whiteness retention, significant reduction in color mottle |
| Environmental Friendliness | Free of APEO, formaldehyde, and meets Oeko-Tex, ZDHC standards |
| Ease of Operation | Can be directly added in conventional dyeing processes without additional steps |
Recommended Application Process (Reference 23717)
The following is a recommended dye-resist process for post-dyeing treatment of polyester:
Process Flow: Dyeing→Reduction Cleaning (alkali+sodium hydrosulfite+dye-resist agent) →Hot Water Wash→Acid Wash→Soaping→Water Wash→Drying
Reduction Cleaning Formula:
- Sodium Hydrosulfite: 2 g/L
- Soda Ash: 1 g/L
- Polyester Dye-Resist Agent: 1- 3 g/L
- Conditions: 80°C,15 minutes, liquor ratio 1:10
Note: The dosage can be adjusted according to the actual situation of different equipment.
Recommended Product: BLUELAKECHEM Polyester Dye-Resist Agent
Model: 23717
Appearance: Light yellow to yellow transparent liquid(the color will gradually lighten with extended storage time)
Scope of Application: For dyeing cotton in polyester-cotton blended fabrics with reactive dyes, leaving white areas on polyester.
Features:
- Strong affinity for polyester fibers, preventing water-soluble dyes from dyeing them.
- No impact on the color and brightness of other fibers.
- Effectively improves fastness by 0.5 to 1.5 grades.
- This product is free of formaldehyde, APEO, and heavy metal ions.
Summary
In the highly competitive textile market, quality is a brand’s lifeblood. Selecting high-performance polyester dye-resist agents can significantly enhance the quality of dyed products and effectively reduce rework rates and costs. Whether improving batch stability or meeting international environmental standards, BLUELAKECHEM dye-resist agents are an indispensable auxiliary in the dyeing and finishing process. Contact us to get more information.
