Name: Trifunctional Aziridine Crosslinker AZ-30
Brand: Coatingsink
SKU: aziridine-crosslinker-tri-az
Availability: InStock

Question 1

At what dosage should AZ-30 be used in a waterborne acrylic emulsion, and when should it be added?

Accepted Answer

Typical addition levels are 0.5–3% aziridine solids based on emulsion solids weight. Start at 1% for standard water-resistance requirements and increase to 3% for demanding solvent- or chemical-resistant topcoats. Add AZ-30 to the finished paint under slow agitation as the very last step before application; pot life after mixing is 8–24 hours at room temperature.

Question 2

How does AZ-30 crosslink waterborne acrylic binders and what crosslink density can be expected?

Accepted Answer

Aziridine groups react with pendant carboxylic acid (–COOH) groups on the acrylic binder via ring-opening, forming stable β-amino ester covalent bonds at ambient temperature. Three reactive sites per molecule yield a high crosslink density, producing films with excellent resistance to water, alcohols, and mild chemicals within 24–72 hours of application. Higher COOH content in the binder (acid value >10 mg KOH/g) maximises crosslink efficiency.

Question 3

What safety precautions are required when handling polyfunctional aziridine crosslinkers?

Accepted Answer

Polyfunctional aziridines are classified as skin sensitisers and potential mutagens under CLP/GHS. Mandatory PPE includes nitrile gloves, chemical splash goggles, and a chemical-resistant apron. Work in a well-ventilated area or under local exhaust ventilation. Do not mix with acids or oxidising agents. In the event of skin contact, wash immediately with soap and water for at least 15 minutes and seek medical advice. Comply with all applicable REACH and national OHS regulations.

pH (1% aq.)	8.0–9.5
Functionality	3 (trifunctional)
Active Content	30% in water
Viscosity (25°C)	<100 mPa·s
Recommended Dosage	0.5–3% on emulsion solids

Trifunctional Aziridine Crosslinker AZ-30

Specifications

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