| 摘要 |
PURPOSE:To improve the rigidity, shock resistance and heat resistance by using the polyol with a specified hydroxyl number as polyol and a specified organic acid salt as hardening catalyst. CONSTITUTION:The liquid mixture of organic polyisocyanate, polyol and hardening catalyst is injected and hardened in the mold, in which fibrous reinforcement material is previously set, by a reaction injection molding machine. The polyol with a hydroxyl number of 300-800 is used as polyol, and the organic acid salt of tertiary amine is used as hardening catalyst. The rigidity required for structural material is not achievable by the hydroxyl number of less than 300, when the hydroxyl number is more than 800, it shows a tendency where the shock resistance deteriorates and also that the impregnation into the fibrous reinforcement material is apt to be difficult due to extremely rapid reaction even without a catalyst. |
