초록 ▼

A two component polyurethane adhesive and a method of bonding construction materials to various construction substrates. The adhesive being the reaction product of two separate components that are mixed together immediately prior to application upon dispensing onto a substrate. The first part of the

A two component polyurethane adhesive and a method of bonding construction materials to various construction substrates. The adhesive being the reaction product of two separate components that are mixed together immediately prior to application upon dispensing onto a substrate. The first part of the adhesive, referred to as the "A-side" is a polyisocyanate prepolymer, preferably a polymeric MDI (methylene diphenyl diisocyanate) based prepolymer. The second part of the adhesive, referred to as the "B-side" is a blend of elastomeric and flexible polyglycols. The adhesive formed by mixing the A-side and B-side components, is a frothing foam that has a consistency such that it does not run or drip when applied to the substrate, that expands upon application to the substrate surface to fill voids or imperfections, that collapses when the material to be bonded is placed in contact with the adhesive, and that has a rapid cure time.

대표청구항 ▼

[ What is claimed is:] [1.] A method of bonding construction materials, the method comprising the steps of:providing an isocyanate prepolymer, a polyether polyol blend, a soft hydrofluorocarbon blowing agent, and an apparatus for mixing and dispensing an adhesive reaction product of the prepolymer a

[ What is claimed is:] [1.] A method of bonding construction materials, the method comprising the steps of:providing an isocyanate prepolymer, a polyether polyol blend, a soft hydrofluorocarbon blowing agent, and an apparatus for mixing and dispensing an adhesive reaction product of the prepolymer and the blend;mixing the prepolymer and the blend under low pressure using the apparatus and dispensing a frothing foam adhesive onto a surface of a substrate;allowing the foam adhesive to react and expand on the surface;placing a construction material in contact with the foam adhesive on the surface of the substrate; andallowing sufficient cell ruptures to cause the foam adhesive to collapse into a void-filling membrane which bonds the construction material to the substrate.