Sodium sulfide (Na₂S) has the following core applications in the dyeing and printing industry:
1.Dyeing Auxiliary
Acts as a solvent for sulfur dyes, promoting uniform dispersion and penetration of dyes into fibers, improving dyeing effectiveness and color fastness.
2.Raw Material for Sulfur Dyes
Serves as a key component in synthesizing sulfur dyes such as sulfur black (硫化青) and sulfur blue (硫化蓝), directly participating in dye production.
3.Enhancing Dyeing Performance
Improves dye coverage on fiber surfaces through a hardening effect, increasing brightness and abrasion resistance;
Reduces dye solubility to enhance dye adhesion;
Utilizes its antioxidant properties to improve corrosion resistance of dyed materials.
4.Mordant
In cotton fabric dyeing, optimizes the bonding between dyes and fibers through complexation reactions, ensuring even coloration.
5.Reducing Agent
Used for denitration of synthetic fibers and reduction of nitrated compounds, aiding fiber modification.
Post time: Apr-29-2025
