Abstract:
The present invention provides aqueous compositions that are stable after at least a 24 hour period comprising a polysaccharide viscosity modifying additive and more than 60 wt.%, based on the weight ot total solids in the compositions of one or more polycarboxylate ether, the compositions comprising an acid chosen from an organic acid having 1 hydroxy group or less, a strong acid containing a single hydrogen, an ascorbic acid, and mixtures thereof, the compositions having a pH of less than the pH of the polycarboxylate ether itself, or from 1.0 to 6.0. The present invention enables stable concentrates of aqueous polycarboxylate ethers and polysachharide viscosity modifying agents for use in hydraulic binder applications, the compositions having a total solids content of 10 wt.% to as high as 65 wt.%.
Abstract:
Bei einem Verfahren zum Dotieren, vorzugsweise Einfärben von porösen Keramiken, insbesondere von porösen Keramikformkörpern, wird die Keramik mit mindestens einer ersten Suspension oder Lösung, die Metallionen und/oder Metallkomplexe enthält, behandelt. Außerdem werden in mindestens einem weiteren (vorzugsweise nachfolgenden) Verfahrensschritt die vorzugsweise zur Einfärbung in die Keramik eingebrachten Metallionen bzw. Metallkomplexe in der Keramikmit Hilfe einer zweiten Lösung oder Suspension immobilisiert, vorzugsweise durch mindestens eine chemische Fällungsreaktion. Vorzugsweise wird die Keramik in einem weiteren Verfahrensschritt mindestens einem Wärmebehandlungsschritt/Sinterschritt unterzogen. Weiter umfaßt die Erfindung einen Kit zur Dotierung, vorzugsweise Einfärbung von porösen Keramiken, insbesondere von porösen Keramikkörpern, der mindestens eine erste Suspension oder Lösung, die Metallionen und/oder Metallkomplexe enthält, sowie mindestens eine zweite Lösung oder Suspension zur Immobilisierung der Metallionen bzw. Metallkomplexe in der Keramik umfaßt.
Abstract:
A process for forming a gel, which process comprises (a) mixing an alkaline silicate solution with a polymer in solid form, the polymer being capable of being converted by hydrolysis into one or more organic acids; and (b) allowing the polymer to release sufficient acid to cause formation of a silicate gel.
Abstract:
A modified alkali silicate composition for forming an inorganic network matrix. The modified alkali silicate matrix is made by reacting an alkali silicate (or its precursors such as an alkali hydroxide, a SiO2 source and water), an acidic inorganic composition, such as a reactive acidic glass, water and optional fillers, additives and processing aids. An inorganic matrix composite can be prepared by applying a slurry of the modified aqueous alkali silicate composition to a reinforcing medium and applying the temperature and pressure necessary to consolidate the desired form. The composite can be shaped by compression molding as well as other known fabrication methods. A notable aspect of the invention is that, although composite and neat resin components prepared from the invention can exhibit excellent dimensional stability to 1000 DEG C and higher, they can be prepared at the lower temperatures and pressures typical to organic polymer processing.
Abstract:
Method of cleaning a hard surface (e.g. floor) in order to remove a complex soil comprises contacting the surface with a first cleaning composition which has a non-neutral pH and then contacting the surface with a second cleaning composition which has a complementary non-neutral pH to that of the first cleaning composition. (The term "complementary" refers to acidic or alkaline as appropriate). Mechanical force may be employed during the application of either or both of the cleaning compositions.
Abstract:
Methods of formulating, premixed cement-based tiling compositions and application of such premixed cement-based tiling compositions as an adhesive or grout. The premixed cement-based tiling compositions include a premixed cementitious slurry having a pH and an alkali activation constituent. The premixed cementitious slurry includes an aluminous or a calcium aluminate cement slurry in an amount of about 35 wt. % to 50 wt. % in combination with one or more filler or modifier materials present in an amount of about 40 wt. % to 65 wt. %. The alkali activation constituent destabilizes the premixed cementitious slurry by increasing the pH thereof to generate a reaction between the premixed cementitious slurry and the alkali activation constituent resulting in the cement-based tiling composition for use as an adhesive or a grout. The alkali composition may be sodium hydroxide supersaturated with lithium carbonate.
Abstract:
A method for precipitating metal waste is characterized in that the waste which contains one or more dissolved metal salts, is mixed with a boron compound, and the pH is adjusted to a value at which precipitation takes place in the presence of precipitation nuclei necessary for the formation of metal borates.
Abstract:
Provided are compositions, methods and systems including cementitious compositions and reinforcing materials wherein the cementitious composition comprises a metastable component.
Abstract:
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.
Abstract:
Angegeben wird eine Beschichtungsmasse zum Schutz gegen Mikroorganismenbefall von Oberflächen, die der Einwirkung von Feuchtigkeit oder Wasser ausgesetzt sind, wobei die Beschichtungsmasse entweder selbst einen pH-Wert von mindestens (11,0) aufweist oder für das Beschichten eines Untergrundmaterials vorgesehen ist, dessen pH-Wert mindestens (11,0) beträgt. Die Beschichtungsmasse ist dadurch gekennzeichnet, dass sie ein Biozid enthält, das in einem Trägermaterial aus Feststoffteilchen gebunden ist und daraus verzögert freigegeben wird.