A binder composition in aqueous solution, suitable for use in the production of foundry sand moulds and cores is obtained by mixing (i) an alkali metal silicate (ii) a substantially water soluble carbohydrate selected from monosaccharides, disaccharides, polysaccharides and derivatives thereof and (iii) a phenolic compound selected from monohydric phenols, dihydric phenols, trihydric phenols, phenols of polynuclear hydrocarbons and phenolic acids, which is miscible with or soluble in an aqueous solution of an alkali metal silicate. The composition may also contain an oxyanion such as a borate which is capable of forming a water soluble complex with the carbohydrate. A mixture of phenolic compounds, such as a mixture consisting predominantly of isomers of di- and trihydroxy diphenyl obtained in the distillation of crude resorcinol, may be used.

Alkali metal silicate binder compositions

A method for forming a composite structure, using a mandrel that is later removed from the composite structure, involves production of a mandrel by depositing a particulate mixture, including an aggregate and a binder, into a mold and removing the mandrel from the mold. The mandrel may be treated while still in the mold by heating, curing with an agent, microwave energy, or by some combination thereof. Once finished, the mandrel can be used in manufacturing polymer and/or composite components. The mandrel can also be include materials that can be easily removed from the finished composite structure by water, shakeout, chemically dissolving, or by some combination thereof.

Aggregate-based mandrels for composite part production and composite part production methods

A protective coating is formed on a metallic material surface by applying a treating agent comprising water, an alkali silicate, and, optionally, a lubricating component to the surface and drying the treating agent. The coating film thereby formed has excellent anti-galling and rust preventive properties. If a lubricating component is present, the coating film also has excellent self-lubricating properties.

Treating agent for forming a protective coating and metallic materials with a protective coating

A method and composition for waterproofing a substrate includes applying a coating composition to a surface of the structural unit. The coating composition includes a) an organic solvent, b) a hydrocarbon resin and c) a copolymer having styrene and diene monomer units, a polymer having olefin monomer units, or a copolymer having styrene and olefin monomer units, or mixtures thereof.

Method and composition for waterproofing

A thermally responsive aqueous silicate composition consisting essentially of an aqueous solution containing an alkali metal silicate and a thermally responsive silicate gelation activator. The thermally responsive silicate gelation activator is a reducing sugar selected from the group consisting of lactose, dextrose, fructose, galactose, mannose, maltose, xylose and mixtures thereof. The aqueous silicate composition can be utilized in treating a subterranean formation for the purpose of sealing the formation.

Thermally responsive aqueous silicate mixtures and use thereof

This invention is directed to binder compositions based upon aqueous solutions of alkali metal silicates. More particularly, this invention is directed to binder compositions consisting essentially of (a) aqueous alkali metal silicate solutions having a molar ratio of SiO2 :Me2 O of from about 2.0:1 to 3.4:1, with Me signifying an alkali metal, and a solids content of from about 35 to 50 percent by weight, based on the weight of the total alkali metal solution, and (b) from about 0.1 to 10 percent by weight, based upon the weight of the total binder composition, of at least one reductively aminated mono-, di-, or oligosaccharide, and the use of such binder compositions in the preparation of molds or cores for metal casting.

Binders based upon solutions of alkali metal silicates

Die Erfindung betrifft ein Verfahren zur Erzeugung von Schaumen auf der Basis von Alkalimetallsilikaten, das dadurch gekennzeichnet ist, das eine wassrige Alkalisilikatlosung einerseits und eine Harterlosung andererseits in separaten Druckbehaltern A und B vorliegen, die Harterlosung in Behalter B durch Betatigen eines Ventils der Silikatlosung in Behalter A zugesetzt und mit ihr vermischt wird und zur Schaumerzeugung bei Betatigen des Entnahmeventils ein unter erhohtem Druck im Bereich von 0 bis 50°C flussiges Treibgas in Kombination mit einem geeigneten Emulgator verwendet wird. Die gebildeten Alkalimetallsilikatschaume zeichnen sich durch Unbrennbarkeit, hohe Temperaturstabilitat und gute Warmedammfahigkeit aus und finden Verwendung als Full-, Damm-, Konstruktions-, Isolations-Material o.dgl. im Bauwesen.

Verfahren zur Herstellung von Wasserglasschaumstoffen aus Aerosoldosen

A process for the production of zeolitic alkali metal aluminosilicates by the reaction of aqueous alkali metal silicate solutions with an aqueous alkali metal aluminate solution containing sulfate anions at temperatures of 0° C to 110° C under a shearing type of agitation and conversion of the amorphous precipitate to crystalline forms by maintaining an aqueous suspension of the amorphous form at temperatures of 40° C or over for a time sufficient to effect crystallization, whereby formation of substantial amounts of inactive nosean are avoided.

Process for the production of zeolitic alkali metal aluminosilicates

Verfahren zur behandlung von aluminiumoberflaechen durch oxydation mit einer nachfolgenden verdichtung

An adhesive composition based upon an aqueous solution of alkali metal silicate with a content of powdered inorganic filler, having good storage stability, which comprises an aqueous alkali metal silicate solution containing: (a) from 10% to 40% by weight of at least one powdered inorganic filler, (b) a suspension effective amount of at least one zinc soap of a fatty acid having from 12 to 22 carbon atoms and (c) from 0 to about 24% by weight of a 50% by weight stable, aqueous dispersion of an alkali-resistant organic polymer, based on the weight of the total composition. Preferably zinc stearate in amounts of from 1% to 5% by weight are added to the adhesives containing powdered inorganic fillers and optionally organic additives on a base of aqueous water glass solutions, to prevent separation phenomena. Sodium and/or potassium silicate solutions can be used, the sodium silicate solution being preferably present in the ratio by weight of 3.3 to 3.9:1 for SiO 2 /Na 2 O, with a solids content of 38% to 28% by weight and the potassium silicate solution at a ratio by weight of 2 to 2.6:1 for SiO 2 /K 2 O, with a solids content of 40% to 29% by weight. The inorganic filler is preferably powdered crystalline calcium carbonate in the form of metamorphous calcite with particle sizes of up to 25 μm.

Wolfgang Dr. Friedemann

Papers

Binders based upon solutions of alkali metal silicates

Verfahren zur Herstellung von Wasserglasschaumstoffen aus Aerosoldosen

Process for the production of zeolitic alkali metal aluminosilicates

Verfahren zur behandlung von aluminiumoberflaechen durch oxydation mit einer nachfolgenden verdichtung

Storage-stable aqueous alkali metal silicate/filler adhesive compositions and their use