Aziridine Crosslinker
CAS Number: 57116-45-7
Aziridine crosslinkers are polyfunctional compounds containing strained three-membered aziridine (ethylenimine) rings that react rapidly and selectively with carboxylic acid groups in waterborne resin systems at room temperature, forming stable covalent amide-ester linkages. Trimethylolpropane tris[3-(2-methylaziridinyl)propanoate] (XAMA-7, CAS 57116-45-7) is a representative trifunctional grade widely used in waterborne coatings and adhesives. Aziridine crosslinkers are valued for their self-crosslinking efficiency, compatibility with acrylic and polyurethane dispersions, and absence of volatile by-products.
Technical Specifications
| pH | 7.5–9.5 (10% aqueous solution) |
| purity | ≥97% |
| appearance | Clear, colorless to very pale yellow liquid |
Applications
- Waterborne acrylic and polyurethane coating crosslinking
- Pressure-sensitive adhesives for labels and tapes
- Inkjet and flexographic ink binders
- Paper and board coating binders for water resistance
- Textile nonwoven binders requiring wash durability
Key Features
- Room-temperature crosslinking with carboxyl-functional waterborne resins
- Low dosage requirement (0.5–3.0 wt% on resin solids) for effective network formation
- Improved water, chemical, and abrasion resistance compared to uncrosslinked films
- Adjustable pot life via pH and temperature control