PROCESS FOR PRODUCING ETHYLALCOHOL TYPE POLYURETHANE ADHESIVE

摘要

PURPOSE: Provided is a process for producing an ethylalcohol type polyurethane adhesive by dispersing a polyurethane adhesive in water and ethanol, which shortens drying time and improves adhesive force. CONSTITUTION: The process comprises the steps of: reacting 100pts.wt. of a polyol component comprising polyester and polyether polyol with 20-25pts.wt. of a diisocyanate component in a low boiling point polymerization solvent in the presence of a catalyst to prepare a prepolymer; neutralizing the prepolymer and then adding 2-5pts.wt. of a chain extender; dispersing it by using 50-150pts.wt. of the water and dropping 100-200pts.wt. of the ethanol and then performing a vacuum distillation to remove the polymerization solvent, wherein the weight ratio of the water and the ethanol is 20-70:30-80.