OMICURE U-24M, an aromatic substituted urea, is intended for use as a latent accelerator for the dicyandiamide cure of epoxy resins. The addition of OMICURE U-24M to epoxy/dicy formulations reduces the time and/or temperature required to cure these shelf stable one part products.
Compared to the other CVC substituted ureas, toluene bis dimethyl urea provides the greatest degree of acceleration to epoxy/dicy formulations. OMICURE U-24M, at concentrations required to provide an equal degree of acceleration, will produce the least effect on cured properties. Suggested use levels of OMICURE U-24M are <5 phr. Curing can be accomplished in about 50 minutes at 100°C and in less than 3 minutes at temperatures >150°C. Cure times are dependent on the composition of the formulated product and your particular end application.
Room temperature shelf lives (time to double viscosity) of >3 months can be obtained when <1 phr OMICURE U-24M is used with DGEBA/DICY. Some of the factors which can effect shelf life are formulation ingredients and compounding parameters. Ingredients in which OMICURE U-24M is insoluble at processing and storage temperatures will enhance overall storage stability. OMICURE U-24M can be incorporated into your formulation concurrent with the dicy addition.
|Particle Size, min. % through a 325 mesh screen||95|
|Moisure Content, Max||1.0|
|Melting Point, °C||180-195|