A polyurethane resin forming composition comprising a chief ingredient (A) containing an isocyanate component, and a curing agent (B) containing a polyol component, wherein an isocyanate group-terminated prepolymer obtained by reacting an isocyanate group-containing compound (a1) with a polyfunctional polyether polyol (b1) obtained by using, as an initiator, a compound having a functionality of at least 6 is contained as the constituent of the chief ingredient (A); and a castor oil-modified polyol (b2) obtained from castor oil and/or a castor oil fatty acid and a trimethylolalkane is contained as the constituent of the curing agent (B). This composition has such a long pot life as to be applicable to the production of large-sized hollow-fiber membrane modules and can form cured resins excellent in adhesiveness and heat resistance, low in the temperature dependence of hardness and, in particular, extremely little in the amount of matter dissolved out in water when immersed in the water.
一种聚
氨酯
树脂成型组合物,包括含有
异氰酸酯成分的主成分 (A) 和含有多元醇成分的固化剂 (B),其中主成分 (A) 的成分是通过将含有
异氰酸酯基团的化合物 (a1) 与通过使用官能度至少为 6 的化合物作为
引发剂而获得的多官能度聚醚多元醇 (b1) 反应而获得的
异氰酸酯基团封端预聚物;
蓖麻油改性多元醇 (b2) 由
蓖麻油和/或
蓖麻油脂肪酸和三羟甲基
烷烃制成,作为固化剂 (B) 的成分。这种组合物具有较长的固化寿命,可用于生产大型中空纤维膜组件,并可形成粘合性和耐热性极佳的固化
树脂,硬度随温度的变化较小,特别是浸入
水中时,溶解在
水中的物质极少。