PROCEDIMIENTO PARA LA FABRICACION DE ESPUMAS BLANDAS DE MOLDEO DE POLIURETANO QUE SE ENDURECEN EN FRIO CON EXCELENTES PROPIEDADES DE AMORTIGUACION

• Main Authors: GANSEN, PETER, WOLF, KLAUS-DIETER, WOLFGRAMM, RUDI, LINDSEY,JOHN J
• Format: Patent
• Language: Spanish
• Published: 16.08.1994
• Edition: 4
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

LAS ESPUMAS BLANDAS DE POLIURETANO FRAGUABLES EN FRIO CON EXCELENTES PROPIEDADES AMORTIGUADORAS SE OBTIENEN MEDIANTE REACCION DE POLIISOCIANATOS CON: A) AL MENOS UN POLIOETER CON UN MINIMO DE DOS GRUPOS OH CON UN NUMERO OH DE 20 A 60 SOBRE UNA BASE DE UN 75 95% DEL PESO DE PROPILENOXIDO Y D UN 5-25% DE ETILENOXIDO Y B) UN POLIETER O POLIESTER CON AL MENOS DOS GRUPOS OH CON UN NUMERO OH DE 150 A 400 Y C) UN POLIETER CON AL MENOS DOS GRUPOS OH CON UN NUMERO OH DE 20 A 200 SOBRE LA BASE DE PROPILENOXIDO Y ETILENOXIDO CON UN CONTENIDO DE ETILENOXIDO DE MAS DEL 50% DEL PESO, REFERIDO A APROPILENOXIDO Y ETILENOXIDO, EN PRESENCIA DE AGUA Y, EN SU CASO, AGENTES PROPULSORES ORGANICOS, CATALIZADOREADA, HIDRANDOSE CATALITICAMENTE EN PRIMER LUGAR LAS MEZCLAS TECNICAS DE ACIDOS GRASOS, SEPARANDO A CONTINUACION LOS ACIDOS GRASOS SATURADOS METILRAMIFICADOS, ESTANDO PREVISTA ANTES DE LA HIDRACION UNA PRESEMARACION DE TRANSRETICULACION. ESTE PROCESO PROPORCIONA LOS PRODUCTOS DESEADOS CON UN ALTO RENDIMIENTO Y UNA GRAN PUREZA. Cold-hardening (curing) flexible polyurethane moulded foams having excellent damping characteristics are produced by reacting polyisocyanates with a) at least one polyether containing at least two OH groups and having an OH number of from 20 to 60, based on from 75 to 95% by weight of propylene oxide and from 5 to 25% by weight of ethylene oxide, and b) a polyether or polyester containing at least two OH groups and having an OH number of from 150 to 400, and c) a polyether containing at least two OH groups and having an OH number of from 20 to 200, based on propylene oxide and ethylene oxide, with an ethylene oxide content of greater than 50% by weight, based on propylene oxide and ethylene oxide, in the presence of water and optionally organic blowing agents, catalysts and foam stabilisers and optionally further assistants and additives.