Two-component polyurethane composition with delayed crosslinking

摘要

The invention relates to a crosslinking two-component polyurethane composition consisting of (i) a constituent A containing polyols and additives, and (ii) a constituent B containing between 100 and 65 wt. % of aromatic polyisocyanates, between 0 and 35 wt. % of aliphatic polyisocyanates, and between 0.05 and 3.0 wt. % of a retarder, and optionally additives, the mixed composition having a viscosity (EN ISO 2555) of between 100 mPas and 3000 mPas at 25° C., and the crosslinked composition having a glass transition temperature (Tg) of higher than 50° C. and a pot life of longer than 60 minutes. The two-component polyurethane composition is suitable as an adhesive and as a matrix substance for composite materials.

主权项

1. A crosslinking two-component polyurethane composition, consisting of
a component A comprising polyols and additives, wherein component A contains no more than 10 wt % of diols having an equivalent weight of 30 to 500 g/eq, a component B containing 100 to 65 wt % aromatic polyisocyanates, 0 to 35 wt % aliphatic polyisocyanates, 0.1 to 3.0 wt % retarders and optionally additives, wherein the mixed composition has a viscosity (EN ISO 2555) of 100 mPas to 3000 mPas at 25° C.; the crosslinked composition has a glass transition temperature (Tg) of more than 50° C.; and has a pot life of more than 60 minutes.