METHOD FOR PRODUCING ONE-PACK MOISTURE-CURABLE POLYURETHANE COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a method for producing one-pack moisture-curable polyurethane composition capable of exhibiting excellent adhesion properties to a precoated steel sheet and glass.SOLUTION: The method for producing one-pack moisture-curable polyurethane composition comprises: a mixing step of mixing a liquid component (A) containing a polyol compound having two or more hydroxyl groups in one molecule thereof with a powder component (B) containing a filler to obtain a paste-like mixture of the liquid component (A) and the powder component (B); a dehydration step of removing at least a part of residual moisture in the paste-like mixture; a prepolymer production step of mixing a polyisocyanate compound (C) having two or more isocyanate groups in one molecule thereof with the residual moisture-removed paste-like mixture to obtain a mixture containing a urethane prepolymer produced by a reaction of the polyisocyanate compound (C) with the polyol compound in the paste-like mixture; and a composition preparation step of mixing the mixture obtained at the prepolymer production step with a reaction product (D) of an aliphatic isocyanate compound (d1) having two or more isocyanate groups in one molecule thereof with alkoxysilane (d2) to obtain the one-pack moisture-curable polyurethane composition.