To provide a civil engineering building sound absorbing member compatible with high damping efficiency and high sound absorbing efficiency.
A civil engineering buiding sound absorbing member is formed of a rigid member 2 and a foam 3 formed by reacting a mixture constituted of polyolefin-polyol having a saturated hydrocarbon resin build and water as a foaming agent and organic polyisocyanate making fatty acid ester having hydroxide group in a chain as a basic build uner the existence of a surface-active agent substituting at least part of hydroxide group for hydrophilic-group and laminated on the surface of the rigid member 2. By the constitution, since the foam 3 dispeses water uniformly, an uniform cell is formed, and high damping efficiency and high sound absorbing efficiency are ensured.
OSANAI SHINSUKE
NISHIDA KIYOMI
ANDO YUTAKA
TOKAI CHEMICAL IND
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