摘要:
L'invention se rapporte à un poudre constituée essentiellement d'agrégats à base de nitrure de bore, ladite poudre présentant une composition chimique globale, en pourcentages massiques,comprenant entre 40et 45% de bore, entre 53et 57% d'azote,moins de 400 ppm poids de calcium, moins de 5%, au total, d'autres éléments, plus de 90% de nitrure de bore, borne incluse, en pourcentages poids et sur la base de la totalité des phases cristallisées, une circularité moyenne supérieure ou égale à 0,90, une taille médiane de pores inférieure ou égale à,5µmet une porosité ouverte inférieure ou égale à 55%.
摘要:
Methods for treating a wellbore and compositions used for same are provided that include emplacing a polymer-forming composition in the wellbore, and initiating polymerization of the polymer-forming composition to form a polymerized material in the selected region of the wellbore. In some aspects, polymeric compositions provided may also be useful for isolating pressure differentials downhole.
摘要:
A spacer fluid made of a viscosity thinner, a weighting agent, an antifoaming agent, and a non-ionic surfactant in a base aqueous fluid. In some instances, the viscosity thinner is a sulfomethylated tannin, the weighting agent is barium sulfate, the antifoaming agent is a silicone, and the non-ionic surfactant is an ethoxylated alcohol. A method of treating a well bore annulus in preparation of introducing water-based cement slurry into a well bore using the spacer fluid. A method of using the spacer fluid to position a first fluid into a well bore annulus of a well bore containing a second fluid. A method for fluidly isolating at least a portion of a well bore annulus in a well bore containing an oil-based drilling fluid using water-based cement slurry and the spacer fluid.
摘要:
A fast-curing pervious concrete mix made by combining : water; a cementitious material comprising portland cement and a supplementary cementitious material; aggregate sized to form a pervious concrete; a water reducer; a quantity of fibers; and a polymeric bonding agent, the mix curing to a compressive strength of at least 2,000 psi within 24 hours of placement. Also, a method of forming a pervious concrete structure by forming the fast-curing pervious concrete mix, placing the mix in a desired formation, and curing the placed mix, and a pervious concrete obtained by placing and curing the fast-curing pervious concrete mix.
摘要:
An insulating packer fluid including an oleaginous fluid and a styrenic thermoplastic block copolymer and methods of preparing the packer fluid are provided. Also provided are methods of using the insulating packer fluid that include pumping an insulating packer fluid into an annulus formed between two concentric strings of pipe extending into a wellbore.
摘要:
In a method for curing mineral wool that is mixed binder through microwaves, generating additional heat through installation of microwave active substances es performed through curing the binder material.
摘要:
The present invention relates to moldable sand compositions, methods for making the moldable sand compositions, and methods for using the moldable sand compositions. In a particular embodiment, the moldable sand composition comprises between about 70% to about 95% sand, between about 5% to about 30% water, a polar polymeric resin, a crosslinking agent, and a humectant. In an exemplary embodiment, the composition contains no oils, waxes, glycols, or rubbers. The composition is capable of becoming hardened over time in order to maintain the achieved shape, and can be re-wetted and molded again after becoming hardened.
摘要:
A joint compound with improved crack resistance is formed by combining water, a filler such as calcium carbonate, a latex emulsion binder, a thickening system such as methyl hydroxyethyl cellulose, and nanocrystalline cellulose. The nanocrystalline cellulose is provided in an amount effective to reduce the crack formation during drying.
摘要:
The present invention is related to compositions and production process of refractory paints containing fused bauxite and/or fused alumina, PVA and/or phenolic resin, water or alcohol as solvent and thixotropic agent, developed with the purpose of painting males and moulds of silica sand, chromite and zirconium for fusing of carbon steels, high alloy, low alloy steels, manganese and irons and that can be used for all types of steel. These paints may also contain zirconium, magnesite and aluminium silicate.
摘要:
The invention relates to improved non-efflorescing cement-free and water-dispersible powder building material compositions comprising a homopolymer or copolymer as binder, useful for the preparation of wet formulations of plasters grouts, waterproofing coatings or mortars for the construction and the civil engineering industry. Redispersible dry composition of polymer finish comprising: a powdery organic binder included a polymer obtained by spray-drying or lyophilisation of a dispersion containing said polymer and a protective colloid; a deprotection agent; a specific adsorbent filler; and/or a load; and/or a water retentive agent; and/or a mineral rheological agent; and/or a defoamer; and/or a biocide; and/or a pigment. The invention also refers to the methods of preparation of these dry compositions and wet formulations, the application of these latter onto the surface of buildings or civil engineering works, the so obtained coatings as well as the so coated elements. The applications of these wet formulations can be also hardened joints or other hardened products for the construction as well as hardened mass objects. All these hardened products are remarkably water-resistant, non efflorescent and easy to obtain.