STRUCTURAL POLYURETHANE ADHESIVE

摘要

The present invention relates to a two-component polyurethane adhesive consisting of a polyol component and a polyisocyanate component, wherein the polyol component comprises a triol with a molar mass of 1,000 to 10,000 g/mol, a diol having two primary hydroxy groups and a molar mass of 60 to 150 g/mol, a poly(trimethylene oxide) diol or a poly(tetramethylene oxide) diol with a molar mass of 200 to 3,000 g/mol and an aliphatic polyamine. The adhesive is characterized by high early strength, a low temperature dependence of the mechanical properties, good adhesion and the possibility of controlled thermally induced release of adhesion.

主权项

1. A polyurethane adhesive consisting of a polyol component K1 and a polyisocyanate component K2; wherein:
the polyol component K1 comprises: at least one triol A1 with an average molar mass in a range of 1,000 to 10,000 g/mol; at least one diol A2 having two primary hydroxy groups and a molar mass in a range of 60 to 150 g/mol; at least one diol A3 with an average molar mass in a range of 200 to 3000 g/mol, which is either a poly(trimethylene oxide) diol or a poly(tetramethylene oxide) diol, and at least one aliphatic polyamine PA with a molar mass in a range of 60 to 500 g/mol; and the polyisocyanate component K2 comprises: at least one polyisocyanate B1; and at least one isocyanate group-containing polyurethane polymer B2; wherein the triol A1, the diol A2 and the diol A3 are present in such a quantity that a weight ratio of (A1+A3)/A2 is in a range of 2.5 to 20, and a weight ratio of A1/A3 is in a range of 2 to 100.