Method for damping noise, vibration and harshness of a substrate and composition therefor

Abstract

A material for damping vibration of a substrate that cures substantially instantaneously upon application in the ambient environment. The damping material composition comprises a resin component and an isocyanate 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 and 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 weight polyether polyol having an isocyanate equivalent content of 15.8% and a 2,4′-isomer content of less than about 15%; and an optional plasticizer(s) for imparting flexibility.

What is claimed is:  
     
         1 . A sprayable, substantially instantaneously curable, vibration damping liquid composition for application on a substrate, the liquid composition consisting essentially of: 
 a first component, consisting essentially of at least one polymer present in an amount sufficient to impart a predetermined amount of tensile strength, hardness and flexibility; and    a second component, consisting essentially of at least one isocyanate compound.    
     
     
         2 . The vibration damping liquid composition as defined in  claim 1  wherein the first component further consists essentially of: 
 at least one chain extender present in an amount sufficient to impart a predetermined amount of tensile strength, weatherability, flexibility, adhesion to specific substrates, and hardness; and  
 at least one filler present in an amount sufficient to impart a predetermined amount of hardness, flexibility, and specific vibration blocking characteristics to the substrate.  
 
     
     
         3 . The vibration damping liquid composition as defined in  claim 2  wherein the first component further consists essentially of: 
 a colorant compound selected from the group consisting of carbon black, titanium dioxide, iron oxide, organic pigments, dyes, and mixtures thereof, and  
 a catalyst selected from the group consisting of tertiary amines, organometallic catalysts, and mixtures thereof.  
 
     
     
         4 . The vibration damping liquid composition as defined in  claim 2  wherein the at least one polymer is selected from the group consisting of polyoxypropylene diols, polyoxypropylene triols, di-, tri-, quad- or penta-functional polyester polyols, di-, tri-, quad- or penta-functional polyether polyols, and mixtures thereof.  
     
     
         5 . The vibration damping liquid composition as defined in  claim 1  wherein the isocyanate compound consists essentially of isocyanate quasi-prepolymers based on a uretonimine modified MDI and a high molecular weight polyether polyol having an isocyanate content of about 15.8% and a 2,4-isomer content of less than about 10%.  
     
     
         6 . The vibration damping liquid composition as defined in  claim 1  wherein the second component further consists essentially of at least one plasticizer present in an amount sufficient to impart a predetermined amount of flexibility.  
     
     
         7 . The vibration damping liquid composition as defined in  claim 6  wherein the plasticizer consists essentially of alkylene carbonates selected from the group consisting of ethylene carbonates, propylene carbonates, butylene carbonates, dimethyl carbonates, and mixtures thereof.  
     
     
         8 . The vibration damping liquid composition as defined in  claim 4  wherein the at least one polymer comprises amine-terminated polyoxypropylene diols of about 2000 molecular weight; 
 wherein the at least one chain extender is selected from the group consisting of dialkyl substituted methylene dianilines, diethyltoluene diamines, and mixtures thereof, and  
 wherein the at least one filler is selected from the group consisting of barium sulfate, calcium carbonate, clay, talc, aluminum silicate, titanium dioxide, nitrile rubbers, butyl rubbers, synthetic rubbers, chopped fiberglass, calcium metasilicate, fibers, fumed silica, and mixtures thereof.  
 
     
     
         9 . The vibration damping liquid composition as defined in  claim 8  wherein the first component of the composition further consists essentially of at least one adhesion promoter, wherein the adhesion promoter comprises an organosilane compound.  
     
     
         10 . A sprayable, substantially instantaneously curable, vibration damping liquid composition for application on a substrate, the liquid composition consisting essentially of: 
 a first component, consisting essentially of: 
 at least one polymer present in an amount sufficient to impart a predetermined amount of tensile strength, hardness and flexibility;  
 at least one chain extender present in an amount sufficient to impart a predetermined amount of tensile strength, weatherability, flexibility, adhesion to specific substrates, and hardness; and  
 at least one filler present in an amount sufficient to impart a predetermined amount of hardness, flexibility, and specific vibration blocking characteristics to the substrate; and  
   a second component, consisting essentially of at least one isocyanate compound.    
     
     
         11 . The vibration damping liquid composition as defined in  claim 10  wherein the at least one polymer is selected from the group consisting of polyoxypropylene diols, polyoxypropylene triols, di-, tri-, quad- or penta-functional polyester polyols, di-, tri-, quad- or penta-functional polyether polyols, and mixtures thereof.  
     
     
         12 . The vibration damping liquid composition as defined in  claim 11  wherein the isocyanate compound consists essentially of isocyanate quasi-prepolymers based on a uretonimine modified MDI and a high molecular weight polyether polyol having an isocyanate content of about 15.8% and a 2,4′-isomer content of less than about 10%.  
     
     
         13 . The vibration damping liquid composition as defined in  claim 12  wherein the second component further consists essentially of at least one plasticizer present in an amount sufficient to impart a predetermined amount of flexibility.  
     
     
         14 . The vibration damping liquid composition as defined in  claim 13  wherein the plasticizer consists essentially of alkylene carbonates selected from the group consisting of ethylene carbonates, propylene carbonates, butylene carbonates, dimethyl carbonates, and mixtures thereof.  
     
     
         15 . The vibration damping liquid composition as defined in  claim 14  wherein the at least one polymer comprises amine-terminated polyoxypropylene diols of about 2000 molecular weight; 
 wherein the at least one chain extender is selected from the group consisting of dialkyl substituted methylene dianilines, diethyltoluene diamines, and mixtures thereof; and  
 wherein the at least one filler is selected from the group consisting of barium sulfate, calcium carbonate, clay, talc, aluminum silicate, titanium dioxide, nitrile rubbers, butyl rubbers, synthetic rubbers, chopped fiberglass, calcium metasilicate, fibers, fumed silica, and mixtures thereof.  
 
     
     
         16 . The vibration damping liquid composition as defined in  claim 15  wherein the first component further consists essentially of: 
 a colorant compound selected from the group consisting of carbon black, titanium dioxide, iron oxide, organic pigments, dyes, and mixtures thereof; and  
 a catalyst selected from the group consisting of tertiary amines, organometallic catalysts, and mixtures thereof.  
 
     
     
         17 . The vibration damping liquid composition as defined in  claim 16  wherein the first component of the composition further consists essentially of at least one adhesion promoter, wherein the adhesion promoter comprises epoxy silane compounds.