Multicomponent polymeric structure for addressing noise, vibration and harshness in structures

摘要

A method and composition for damping vibration of a substrate as well as a construction configured to achieve dampened vibration transmission. The construction includes a substrate configured to transmit NVH associated vibration in at least one frequency range. The construction also includes a first polymeric layer overlying at least a portion of the substrate element. The first polymeric layer comprises at least one material having elastomeric characteristics in a Tg range between +10 to −10° C. as outlined in ASTM E1640-00 and a hardness of between 5 and 25 as measured with the Shore A methodology outlined in ASTM D2240-00 and a second polymeric layer having elastomeric characteristics less than those exhibited by the first layer.

主权项

1. A construction configured to dampen vibration transmission, the construction comprising:
a solid substrate element configured to transmit an associated vibration in at least one frequency range; a first polymeric layer overlying at least a portion of the substrate element, the first polymeric layer comprising at least one polymeric material having elastomeric characteristics in a Tg range between +10 to −10° C. and a hardness of between 5 and 25 as measured with Shore A methodology, wherein the polymeric material of the first layer is composed of polymers resulting from reactive admixture of isocyanate and at least one of amine-terminated polyether polyols, amine-based tetrol polyols, polyetheramines having a molecular weight between 500 and 2500, and high functional polyols having a molecular weight between 300 and 1000; a second polymeric layer in outermost overlying direct contact to at least a portion of the first polymeric layer at a location opposed to the substrate, wherein the second polymeric layer exhibits greater rigidity than the first polymeric layer and wherein the second polymeric layer is composed of at least one polymeric material that possesses lower elastomeric characteristics than the polymeric material present in the first polymeric layer, wherein the polymeric material of the second layer is a polyurea polymeric compound formed from a first component that consists essentially of a polymer and/or a blend of polymers present in an amount sufficient to impart a predetermined amount of tensile strength, hardness, and flexibility and a second component composed of an isocyanate quasi-prepolymer based on modified MDI and high molecular weight polyether polyol having an isocyanate content between about 10 and 60% and a 2,4 prime-isomer content of less than 10%.