| 摘要 |
A process for manufacturing a polyurethane prepolymer adhesive under room temperature conditions comprises the steps of: a) introducing a predetermined amount of at least one polyol reactant into a reaction vessel; b) mixing a predetermined amount of at least one isocyanate reactant into the reaction vessel to give a uniform resin mixture sufficient to give an excess active isocyanate content in the polyurethane prepolymer adhesive; c) adding a predetermined amount of catalyst to initiate reaction of the reactants in the reaction vessel, with vigorous stirring to give a uniform mixture; d) isolating the mixed contents in the reaction vessel from ambient conditions to prevent contamination of the contents by ambient moisture; and e) mixing the reactants during the reaction in the reaction vessel until the reaction substantially subsides, whereby the polyurethane prepolymer adhesive is formed. Compounding includes alternatives of catalyst and co-catalyst combinations, and additives, including a reaction inhibitor, plasticizer, delayed action catalyst and surfactant. |
