Polymeric composition for cement based substructures

摘要

The present invention is directed to a composition capable of inhibiting moisture vapor emission from concrete structures and enhancing adhesion of a finish material to the concrete structure comprising an aqueous mixture of a first copolymer of mer units formed from vinylidene halide and a C1-C2 alkyl acrylate with a second copolymer of mer units formed from vinylidene halide and a C4-CS alkyl acrylate and to the method of forming a moisture barrier/adhesion promoter coating on concrete comprising applying from 2.8 to 5.6 liters (0.75 to 1.5 gallons) of an aqueous carrier having from 10 to 50 weight percent of the mixture of copolymers stated above per 14 m2 (150 square feet) of the free surface of a concrete structure.

主权项

1. A method of inhibiting moisture vapor emission from the surface of a concrete structure and enhancing interfacial adhesion between the concrete surface and a covering thereon comprising applying to the concrete surface an aqueous mixture of at least one first copolymer comprising mer units derived from vinylidene halide and mer units derived from C1-C2 alkyl acrylate, said mer units derived from C1-C2 alkyl acrylate being present in from 5 to 40 weight percent of the first copolymer; and at least one second copolymer comprising mer units derived from vinylidene halide and mer units derived from C4-C5 alkyl acrylate, said mer units derived from C4-C5 alkyl acrylate being present in from 3 to 40 weight percent of the second copolymer; the first and second copolymers together form from 10 to 50 weight percent of the aqueous mixture; and the aqueous mixture has a pH of 1.5 to 3.5; said aqueous mixture substantially uniformly applied to the surface to distribute a coating having from 0.4 to 4 kg of copolymer mixture per 14 m2 of free surface of the concrete structure.