| 摘要 |
PURPOSE:To obtain a high-expansion-ratio foam in which the constituent fibers are firmly bonded to each other and which has uniform cells by impregnating a composition obtained by mixing a cellulosic fiber with an animal or vegetable paste or a synthetic resin emulsion or a rubber latex in a specified ratio with an inorganic gas under high-temperature and high-pressure canditions, decreasing the pressure in the system, and expanding the composition. CONSTITUTION:A foam is prepared by mixing 100 pts.wt. cellulosic fiber with 10-100 pts.wt. animal or vegetable paste, 100-1000 pts.wt. water and 0.1-20 pts.wt. surfactant or by mixing 100pts.wt. cellulosic fiber with 50-200 pts.wt. synthetic resin emulsion or rubber latex of a solids concentration of 20-80wt.%, 100-400 pts.wt. water and 0.1-20 pts.wt. surfactant, impregnating the obtained mixture with an inorganic gas, decreasing the pressure in the system and expanding the mixture. Alternatively a foam is prepared by making 0.8g/cm<2> or above of an inorganic powder adhere to the particles prepared by molding the composition to impart flowability to them and supplying them after the shape of the mold. |
