Name: Oxazolidine Latent Hardener OZ-100 (Moisture-activated)
Brand: Coatingsink
SKU: oxazolidine-latent-hardener-oz100
Availability: InStock

Question 1

How does an oxazolidine function as a latent hardener in 1K PU coatings?

Accepted Answer

Oxazolidines are cyclic aminal compounds stable under dry conditions. When the applied coating is exposed to atmospheric moisture, the oxazolidine ring hydrolyzes to release an amino alcohol in situ. This generated amine then reacts with the isocyanate groups in the binder, crosslinking the film from the outside inward. The result is a single-package system with excellent shelf life that cures on exposure to ambient humidity.

Question 2

What relative humidity level is required for adequate cure of OZ-100-based coatings?

Accepted Answer

Cure proceeds adequately at relative humidity ≥40% at 20°C. Below 30% RH the cure rate slows significantly and the film may remain tacky. In very dry environments (desert climates, air-conditioned interiors in winter) a slightly elevated film thickness or the use of a humidity chamber during initial cure is recommended. Cure completes fully within 24–48 h at 50% RH and 20°C.

Latency	stable in dry formulations for ≥6 months
Activation	atmospheric moisture (≥40% RH)
Appearance	colorless to pale yellow liquid
NCO Equivalent	reacts with moisture to generate amine in situ
Viscosity (25°C)	200–500 mPa·s

Oxazolidine Latent Hardener OZ-100 (Moisture-activated)

Specifications

FAQ

Interested in Oxazolidine Latent Hardener OZ-100 (Moisture-activated)?