Polyurethane-reactive system for pultrusion

A polyurethane reactive system comprising

• an isocyanate component A),
• an isocyanate-reactive component B) comprising
• 3-13% by weight of a polyether polyol B1) having a hydroxyl number of 20 to 50 mg KOH/g and comprising a reaction product of a first H-functional starter compound having a functionality f of ≥2 to ≤4 with ethylene oxide and propylene oxide,
• 15-37% by weight of a polyether polyol B2) having a hydroxyl number of 900 to 1100-mg KOH/g and comprising a reaction product of a second H-functional starter compound having a functionality f of ≥2 to ≤4 with a second alkylene oxide,
• 50-72% by weight of a polyether polyol B3) having a hydroxyl number of >50 to <900 mg KOH/g and comprising a reaction product of a third H-functional starter compound with a third alkylene oxide,
• one or more catalysts B4) and
• a drying agent B5),
• wherein the sum of the % by weight of the components B1) and B2) amounts to ≤40% by weight based on the sum of the amounts of B), C) and D) and the sum of the % by weight of the components B1), B2), B3), B4) and B5) amounts to ≥90% by weight based on the sum of the amounts of B), C) and D),
• an internal release agent C),
• and optionally further auxiliary and additive substances D),
• wherein the % by weight of the components B), C) and optionally D) sum to 100% by weight,
• wherein the hydroxyl numbers of the polyether polyols B1), B2) and B3) are determined according to ISO 14900, and
• wherein the isocyanate-reactive component B) exhibits no phase separation, turbidity, or droplet formation over 6 months at room temperature.