VIBRATION-DAMPING MATERIAL AND ITS PRODUCTION

PURPOSE:To provide the titled material having extremely small spring constant and excellent vibration-damping property, useful for the vibration-damping of railroad, etc., and composed of a foamed polyurethane elastomer having low degree of expansion and having a structure characterized by the densi...

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Hauptverfasser:	MOTOMIYA TATSUYA, OISHI FUJIO, SUZUKI TOSHIO, OGAWA YOSHIHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BLASTING CHEMISTRY COMPOSITIONS BASED THEREON ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERAL PROCESSES OF COMPOUNDING HEATING LIGHTING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MEANS FOR DAMPING VIBRATION MECHANICAL ENGINEERING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS SHOCK-ABSORBERS SPRINGS THEIR PREPARATION OR CHEMICAL WORKING-UP THERMAL INSULATION IN GENERAL WEAPONS WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To provide the titled material having extremely small spring constant and excellent vibration-damping property, useful for the vibration-damping of railroad, etc., and composed of a foamed polyurethane elastomer having low degree of expansion and having a structure characterized by the density varying from the intermediate layer toward the surface layer, and having dense layers near the surface. CONSTITUTION:The objective material is composed of a foamed polyurethane elastomer having low degree of expansion, and having three-layered structure consisting of a dense layer 8, a porous layer 7 and a dense layer 8, i.e. having dense layers at the surface region, wherein the density varies continuously or discontinuously from the intermediate layer toward the surface layers. The foam can be produced by reacting (A) an organic polyisocyanate with (B) a polyether polyol having an average number of functional groups of 2.5-3.5 and a number-average molecular weight of 4,500-8,500, and (C) a chain extender at a ratio to give an NCO index of 90-110, in the presence of (D) freon gas having a boiling point of 40-70 deg.C as a foaming agent.