What is described is a process for producing an article for use in the foundry industry, selected from the group consisting of molds, cores, feeder elements and molding material mixtures, comprising the following steps: (S1) producing or providing a binder system comprising the following components in three spatially separate vessels: a component (A) comprising particulate amorphous silicon dioxide, a first liquid component (B) comprising waterglass, and a second liquid component (C) comprising aluminate ions dissolved in an aqueous phase, (S2) contacting a mold base material (D) and constituents of all the said components (A), (B) and (C) of the binder system in predetermined ratios in one or more steps, so as to result in a molding material mixture in which the aluminate ions and the particulate amorphous silicon dioxide are mixed wholly or partly into the waterglass, wherein steps (S1) and (S2) are conducted in a facility for producing molding material mixtures. Also described are a corresponding molding material mixture and apparatuses and uses

A well cementing composition comprises an aqueous fluid, portland cement, styrene-butadiene latex and styrene sulfonate-maleic acid copolymer. The styrene sulfonate-maleic acid copolymer has a molecular weight between 5,000 g/mol and 25,000 g/mol. The composition may be placed in a subterranean well during a primary cementing or a remedial cementing operation.

A well cementing composition comprises an aqueous fluid, portland cement, styrene-butadiene latex and styrene sulfonate-maleic acid copolymer. The styrene sulfonate-maleic acid copolymer has a molecular weight between 5,000 g/mol and 25,000 g/mol. The composition may be placed in a subterranean well during a primary cementing or a remedial cementing operation.

A cement composition comprising a hydraulic cement, water and a suspension agent comprising a polymer formed via emulsion polymerization, wherein the polymer has a weight average molecular weight of at least 600,000. The cement composition may be introduced into a wellbore to cement a casing in place within the wellbore. The cement composition is able to maintain consistency and thickness even at high temperatures above 350° F.

A cement composition comprising a hydraulic cement, water and a suspension agent comprising a polymer formed via emulsion polymerization, wherein the polymer has a weight average molecular weight of at least 600,000. The cement composition may be introduced into a wellbore to cement a casing in place within the wellbore. The cement composition is able to maintain consistency and thickness even at high temperatures above 350° F.

The permeability of barrier layers formed from sodium bentonite clay may be significantly and unpredictably impacted upon contacting various ionic substances. Modifying agents may be admixed with sodium bentonite clay to lessen the impacts resulting from its contact with an ionic substance. Suitable modifying agents may comprise an anionic substance selected from the group consisting of a diutan, a polymer containing a 2-acrylamido-2-methylpropanesulfonic acid monomer, any salt thereof, and any combination thereof. Methods for forming a barrier layer may comprise: providing a barrier material comprising sodium bentonite clay and a modifying agent admixed with the sodium bentonite clay, the modifying agent comprising an anionic substance selected from the group consisting of a diutan, a polymer containing a 2-acrylamido-2-methylpropanesulfonic acid monomer, any salt thereof, and any combination thereof; and forming a barrier layer comprising the barrier material.

The permeability of barrier layers formed from sodium bentonite clay may be significantly and unpredictably impacted upon contacting various ionic substances. Modifying agents may be admixed with sodium bentonite clay to lessen the impacts resulting from its contact with an ionic substance. Suitable modifying agents may comprise an anionic substance selected from the group consisting of a diutan, a polymer containing a 2-acrylamido-2-methylpropanesulfonic acid monomer, any salt thereof, and any combination thereof. Methods for forming a barrier layer may comprise: providing a barrier material comprising sodium bentonite clay and a modifying agent admixed with the sodium bentonite clay, the modifying agent comprising an anionic substance selected from the group consisting of a diutan, a polymer containing a 2-acrylamido-2-methylpropanesulfonic acid monomer, any salt thereof, and any combination thereof; and forming a barrier layer comprising the barrier material.

A method for producing a hardened product of a hydraulic composition, includes mixing water, a hydraulic powder, a dispersant composition, and an aggregate to prepare a hydraulic composition, filling the hydraulic composition into a mold, and steam curing, in the mold, the hydraulic composition filled into the mold. The dispersant composition includes (A) a formaldehyde naphthaienesulfonate condensate or a salt thereof, (B) a compound having an alkylenoxy group, and optionally (C) a polycarboxylic acid-based copolymer, in particular proportions.

A method for producing a hardened product of a hydraulic composition, includes mixing water, a hydraulic powder, a dispersant composition, and an aggregate to prepare a hydraulic composition, filling the hydraulic composition into a mold, and steam curing, in the mold, the hydraulic composition filled into the mold. The dispersant composition includes (A) a formaldehyde naphthaienesulfonate condensate or a salt thereof, (B) a compound having an alkylenoxy group, and optionally (C) a polycarboxylic acid-based copolymer, in particular proportions.

Cement slurries, cured cements, and methods of making cured cement and methods of using cement slurries are provided. The cement slurries have, among other attributes, an extended thickening time, leading to improved retardation, flowability, and pumpability and may be used, for instance, in the oil and gas drilling industry. The cement slurry comprises water, a cement precursor material, acrylic acid copolymer, zinc oxide, and a phosphonic acid-based thickener.