An innovative method for improving dyeing yield of the cellulosic substrate using additives in NaOH-water eutectic...

Area of Science:

• Textile Chemistry
• Green Chemistry

Background:

• Conventional mercerization uses high concentrations of sodium hydroxide (NaOH).
• This process presents environmental concerns and drawbacks.
• Improving dyeing properties and reducing chemical consumption are key challenges.

Purpose of the Study:

• To develop a novel, environmentally friendly mercerization method.
• To reduce sodium hydroxide consumption in textile processing.
• To enhance the dyeing and mechanical properties of cellulosic substrates.

Main Methods:

• Investigated a binary and tertiary mixture of urea, thiourea, and sodium hydroxide.
• Conducted experiments varying treatment time, temperature, and chemical concentrations.
• Evaluated dye properties using K/S values.
• Assessed material characteristics via ATR-FTIR spectroscopy, microscopy, and mechanical testing.

Main Results:

• Optimized chemical mixtures significantly enhanced dyeing properties.
• Reduced sodium hydroxide concentration from 300 g/lit to 160 g/lit.
• The novel eutectic solvent treatment did not adversely affect tensile or other mechanical properties.
• ATR-FTIR and microscopic analysis confirmed structural modifications.

Conclusions:

• A novel mercerization method using a urea, thiourea, and sodium hydroxide mixture is effective.
• This method offers a sustainable alternative, reducing chemical waste and improving fabric performance.
• The process is feasible for industrial application with environmental and economic benefits.