Laying carpets and other floor covering materials with or without using an adhesive

摘要

A cement-based trowelling screed for laying flooring with or without a resin-based adhesive contains 2,3,4,5-tetrahydroxy-adipic acid as liquefier, a low-emission carboxylated butadiene-styrene copolymer to provide flexibility and a mixture of milled hard fiber latex and other fibers. A method (V1) for laying flooring comprises (1) mixing a known trowelling compound in the form of a dry mortar mix based on Portland cement, high-alumina cement and calcium sulfate (Type K expanding cement capable of forming an ettringite phase) with (based on total dry mix) 0.15-1.0 wt% 2,3,4,5-tetrahydroxy-adipic acid (THAA) as liquefier and 10-20 wt% of a mixture of (a) milled hard fiber latex, (b) glass and/or polymer fibers, (c) amino-acid polycondensation fibers and (d) polyurethane foam (2), making the dry mortar mix more flexible with 4-8 wt% of a saponification-resistant dispersion of a carboxylated butadiene-styrene (CBS) copolymer with a very low emission value (not more than 300 micro-g/m<3> after 10 days), (3) making up the mix with water, (4) spreading the wet mix on the substrate and drying it to form a thin screed with improved sound proofing against footstep noise, (5) applying a low-emission (not more than 300 micro-g/m<3>) solvent-free synthetic resin dispersion with a water content of not more than 15 wt%, containing a tackifier based on natural resin ester and/or synthetic resin together with 1-5 wt% emulsifier based on sulfated and/or sulfonated hydroxy-octadecenoic acids and/or their high-molecular weight triglycerides, the tackifier being adjusted to pH 4-6, and (6) laying the floor covering on this resin coating. Another version (V2) of the process comprises mixing the cements etc. as above with 0.5-1.0 wt% THAA, making up with water, spreading this mix on the substrate and then forming a mechanical (adhesive-free) bond between flooring and base by arranging for the fibers (mixture a-d; with 0-100% b based on a) to stick out of the screed. Independent claims are also included for (A) a dry screed mix as above containing 0.15-1.0 wt% THAA as liquefier; (B) a dry screed mix containing 0.15-1.0 wt% THAA and 10-20 wt% mixture (a-d) as above; (C) aqueous, non-ionic, stabilized, low-emission, saponification-resistant dispersions of CBS copolymers containing 10-30 wt% mixture (a-d) as above with a content of 0-100% (b) based on (a).