OMICURE U-52
OMICURE U-52
OMICURE U-52 is an aromatic substituted urea that is intended for use as a latent accelerator for the dicyandiamide cure of epoxy resins. The addition of OMICURE® U-52 to epoxy/dicy formulations produces shelf-stable one-part products that cure in shorter times and/or at lower temperatures. Of the CVC Thermoset Specialties substituted ureas, methylene bis (phenyl dimethyl urea) provides the best combination of acceleration, long shelf life, and maintenance of cured properties in dicy-cured DGEBA.
Suggested use levels of OMICURE U-52 in DGEBA/dicy are ≤ 5 phr. At 5 phr, curing can be accomplished in about one hour at 100°C and in less than five minutes
at temperatures ≥ 150 °C. Room temperature shelf lives (doubling of viscosity) are longer than six months. Cure times and shelf lives are dependent on the composition of the formulated product and your particular end application. Some of the factors that can affect shelf life are formulation ingredients and compounding parameters. Ingredients in which OMICURE U-52 is insoluble at processing and storage temperatures will enhance overall storage stability. It can be incorporated into your formulation concurrent with the dicy addition.
Applications for OMICURE U-52
- Adhesives
- Powder coatings
- Prepregs
- Encapsulation
- Reinforcements
Properties
Check out other OMICURE Curing Agents, Accelerators, and Catalysts in the CVC Product Brochure!
