4-Methoxyphenol → Urethane acrylate

Participants

Reaction Steps

An amount of isophorone diisocyanate was added to a reaction vessel at room temperature. Heating jacket temperature was adjusted to 45° C. suspended in a room temperature water bath and stirred. When the reaction batch temperature was 45° C., dibutyltin dilaurate (DBTDL), as catalyst, and 4-methoxy phenol (MEHQ), as free-radical polymerization inhibitor, were also added. Pentaerytritol triacrylate was added incrementally to control exothermic activity. When the exothermic activity ceased, the result of Stage I was added and batch temperature was adjusted to 60° C. The batch was kept at 60° C. until no free isocyanate was detected by FTIR. Reaction scheme is given below. Viscosity of the product was 13,000 cP at 25° C. and it readily mixes with water. When the product was diluted with equal amount (by weight) of water viscosity was 50 cP at 25° C.

Provenance & Evidence