| 摘要 |
A method for damping vibration of a substrate comprises the step of applying a liquid material onto the substrate in an ambient environment, wherein, after application to the substrate, the material cures substantially instantaneous ly in the ambient environment. The damping composition usable therefor comprise s a resin component and an isocynanate component. The resin component includes a polymer(s) for imparting tensile strength, hardness and flexibility; an optional chain extender(s) for imparting tensile strength, weatherability, flexibility, adhesion to specific substrates, and hardness; and an optional filler for imparting hardness, flexibility, and specific noise, vibration an d harshness blocking characteristics to the after-application, cured surface. The isocyanate component of the composition includes an isocyanate quasi- prepolymer(s) based on a uretonimine modified MDI and a high molecular weigh t polyether polyol having an isocynanate equivalent content of 15.8 % and a 2, 4'- isomer content of less than about 15 %; and an optional plasticizer(s) for imparting flexibility.
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