| 摘要 |
PURPOSE:To obtain a heat-insulating structure buried with a reinforcement by a one-shot integral molding method in which a reinforcement is set in the cavity of molds and a specific mixed liquid is injected into the cavity and hardened by reaction in such a way as to form a molding consisting of a high-density and strong outer layer and a low-density expanded inner layer. CONSTITUTION:A reinforcement 7 is laid by small string holders 8a and 8b inside a cavity 4 formed by an upper mold 2 and a lower mold 3, and a mixture of a liquid a containing a polyhydroxy compound, a low-boiling solvent, a catalyst, and water and a liquid B composed of a polyisocyanate is injected into the cavity 4, expanded, and hardened. After the lapse of a given period of time, the exposed portion of the molding from the holders is removed and then the molding is removed from the molds. The structure thus obtained has a high- density outer layer, a low-density inner layer, and an overall density of 50- 800kg/m<3>. |
