| 摘要 |
<p>PURPOSE:To form a heat-insulating board having good heat-insulating function and good sound proofness by a method in which a processed base material is impregnated with an urea resin liquid, neutralized, and mixed with a forming resin and an aggregate. CONSTITUTION:A cellulosic base material (e.g., broken chips, pulp, etc.) is dried by heating to the air-dried water content of within 15 deg./wt% and mixed with an urea resin adhesive liquid of emulsion type. The mixture is allowed to stand for 20-30min. In this case, the pH of the base material mixture is adjusted to neutral side by the addition of ammonium chloride or hydrochloric acid as a hardener to the resin liquid. The aggregate 1 so prepared is mixed with an expansible resin material 2 (e.g., urethane resin or polystyrene resin, etc.) and then with a blowing agent, a stabilizer and a deterioration inhibitor, and molded into a base board (a).</p> |
