CALCIUM SULFATE COMPOSITION COMPRISING AN ADDITIVE

摘要

The invention relates to a composition comprising at least 10 wt. % of a binder based on calcium sulfate and 0.005 to 5 wt. % of an additive made of at least one water-soluble salt of a multivalent metal cation, at least one compound which is capable of releasing an anion that forms a poorly soluble salt together with the multivalent metal cation, and at least one polymer dispersant which comprises anionic and/or anionogenic groups and polyether side chains. The invention further relates to a method for producing said composition and to the use thereof as a calcium sulfate flow screed, a flowable calcium sulfate filler compound, or an earth-moist calcium sulfate screed.

主权项

1. A composition comprising, based on the total mass of the composition:
A) at least 10 wt % of a binder based on calcium sulfate and B) 0.005 to 5 wt % of an additive prepared from components comprising: i) at least one water-soluble salt of a polyvalent metal cation, ii) at least one compound able to release an anion which forms a sparingly soluble salt with the polyvalent metal cation, and iii) at least one polymeric dispersant which comprises an anionic and/or anionogenic group, and a polyether side chain, wherein the polyvalent metal cation being is at least one selected from the group consisting of Al3+, Fe3+, Fe2+, Cu2+, Mg2+, Ca2+, Sr2+, Ba2+ and mixtures thereof, the metal cation is present in an amount such that the relation according to formula (a) is greater than 0.1 and less than or equal to 30:0.1<ΣizK,inK,iΣjzs,jns,j≤30.(a) zK,i is the amount of the charge number of the polyvalent metal cation, nK,i is the number of moles of the polyvalent metal cation, zS,j is the amount of the charge number of the anionic and/or anionogenic group present in the polymeric dispersant, nS,j is the number of moles of the anionic and/or anionogenic group present in the polymeric dispersant, the indices i and j are independent of one another and are each an integer greater than 0, i is the number of different polyvalent metal cations, and j is the number of different anionic and/or anionogenic groups present in the polymeric dispersant.