Urea (Dye Solubilizer for Printing)
CAS Number: 57-13-6
Technical-grade urea is an essential auxiliary in reactive dye printing paste formulations. It acts as a dye solubilizer and hygroscopic agent that maintains moisture in the print area during steaming, promoting dye dissolution and migration into the fiber for high fixation efficiency. Typically used at 50–200 g/kg in print paste alongside sodium alginate and alkali.
Technical Specifications
| appearance | White granules or prills |
| biuret (%) | ≤0.5 |
| purity (%) | ≥99.0 |
| moisture (%) | ≤0.5 |
| pH (10% solution) | 7.0–8.5 |
| active content (%) | ≥46.3 N |
Applications
- Reactive dye print paste formulation for cotton fabric
- Improving dye solubility in high-concentration print pastes
- Cold pad-batch printing auxiliary for reactive dyes
- Vat dye printing to maintain moisture during steaming
- Acid dye printing on silk and wool with steam fixation
Key Features
- Increases dye solubility in concentrated print pastes up to 3-fold
- Hygroscopic properties maintain optimal moisture during steaming
- Commodity chemical with reliable supply and competitive cost
- Compatible with all reactive, acid, and vat dye print formulations
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CAS Number
57-13-6
Category
Textile Dyeing AuxiliariesAvailability
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