2-Ethylhexyl acrylate → Urethane acrylate

Participants

Reaction Steps

A four-neck flask fitted with a stirrer, a dropping funnel, a nitrogen inlet tube and a thermometer was charged with 1,000 g of the polyoxyalkylene polyol (a1-1), 222 g of isophorone diisocyanate (IPDI), 700 g of 2-ethylhexyl acrylate as a diluent, and 0.1 g of dibutyltin dilaurate as a catalyst, and these components were reacted for 4 hours at a temperature of 100° C. The isocyanate concentration within the reaction mixture was measured using an AT-400 potentiometric automatic titrator (manufactured by Kyoto Electronics Manufacturing Co., Ltd.), and once it had been confirmed that the isocyanate concentration had reached 0.75%, 840 g of a polyoxyalkylene monool (a commercial product Preminol S 1004, manufactured by Asahi Glass Co., Ltd., hydroxyl value: 16.7 mgKOH/g) and 87 g of hydroxyethyl acrylate (HEA) were added to the reaction mixture, and reaction was continued for a further 2 hours at a temperature of 100° C. The infrared absorption spectrum of the thus obtained reaction mixture was then measured, confirming that the isocyanate group absorption (2250 cm−1) had disappeared.

Provenance & Evidence