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Material to be used as concrete additive Invention relates to an admixture for a cementitious composition comprising microfibrillar cellulose and/or a derivative thereof. The invention also relates to a method of manufacturing said admixture and to the use of the microfibrillar cellulose and/or a derivative thereof in the concrete admixture. The invention further relates to a cementitious composition comprising said admixture and methods of manufacture and use thereof. A cement admixture, wherein the admixture comprises microfibrillar cellulose; and/or a derivative thereof; and/or labile chemically modified cellulose pulp or cellulose raw material which forms microfibrillar cellulose during the use of the admixture; and optionally water, wherein the microfibrillar cellulose is obtained from raw material comprising plant material. A method of manufacturing a cement admixture comprising providing microfibrillar cellulose and/or a derivative thereof, mixing together said microfibrillar cellulose and/or a derivative thereof, and optionally water, adding at least one plasticiser and/or dispersing agent prior to, during or after providing microfibrillar cellulose to obtain said admixture. The invention is expanded in dependent claims. |
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Method to manufacture acoustic panels and process line for their manufacturing Method to manufacture acoustic panels includes preparation of a water suspension from mineral wool, a binder, a filler and target additives. The produced suspension in the form of a raw mat is applied onto a continuously moving tape with a net. It is pressed with the help of vacuum. Drying and finishing treatment is performed. At the same time mineral wool for the suspension is additionally manufactured. After pressing moisture of the raw mat makes 55-60%. Before drying the raw mat is cut, drying is carried out in a multi-level moulding drying furnace with three heating zones, accordingly: 270-280°C, 330°C and 240°C. At the same time variation of temperature in the cross profile of the furnace makes +/-5°C, and moisture of panels at the outlet from the moulding furnace is not more than 0.5%. |
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Invention relates to compositions of concrete mixtures. The concrete mixture contains portland cement, sand, crushed stone, arabinogalactan and water, wherein the arabinogalactan is contained amount of 0.06-0.09 wt %, wherein the concrete mixture further contains sodium nitrate as a hardening agent in amount of 0.17-0.20 wt % with respect to the weight of all components of the mixture. |
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Additive to mineral building materials, influencing rheology Claimed invention relates to rheological additive for replacement of casein in compositions of mineral hardening building materials. Rheological additive contains, at least, two different dispersers and, at least one stabiliser, or, at least, one disperser and, at least, two different stabilisers, where said, at least, one disperser or said, at least, two dispersers are selected from group of ligninsulfonate, polycarboxylate, polycarboxylate ether, melamine formaldehyde sulfonate, alkylphenol glycol ether and/or naphthalene sulfonates, and where said, at least, one stabiliser or said, at least two stabilisers are selected from group of modified or non-modified, totally or partially hydrolysed polyvinyl alcohol, polyvinylacetal, polyvinylpyrrolidone, polyalkylene glycol, polyalkylene oxide, agar-agar, seed grains of carob tree, pectin, poly(meth)acrylate and (meth)acrylate thickeners, poly(meth)acrylamides, polyurethanes, associative thickeners, gelatin and/or soy protein. In addition, described are: method of obtaining additive, application of additive, as well as compositions of mineral hardening building materials, which contain rheological additive. Invention is developed in dependent items of invention formula. |
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Composition of structural material Present invention relates to a composition of structural material which contains a cross-linked starch derivative with amylopectin content higher than 85%, wherein 5% of the aqueous Brookfield viscosity of the pure starch derivative is 1000-10000 mPa.s at 100 rpm and 20°C, preferably 2000-7000 mPa.s. Said structural material can be used in cement and/or dispersion-modified structural adhesives, preferably in an adhesive for gluing tiles, particularly for ceramic facing or in heat-insulation composite systems. The invention is developed in subclaims. |
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Light gypsum board and gypsum suspension composition for making said board Invention relates to a gypsum suspension, light gypsum board in which the core is made from said suspension and a method of making said gypsum board. The gypsum suspension contains gypsum, water and starch with Brookfield viscosity of not more than 60 cP at temperature lower than 60°C and Brookfield viscosity greater than 10000 cP at temperature from 70°C. The gypsum board has a core made from the solidified gypsum suspension described above. The method of making the gypsum board includes the following steps: preparing gypsum suspension by mixing its components in a mixer; depositing the obtained suspension onto at least one facing sheet, shaping the sheet into a belt and, optionally, covering the top surface of the suspension with a second facing sheet, if needed, moulding the edges of the obtained tape into profile strips, hydraulic setting of the gypsum on the production line when the tape moves in a belt conveyor. The invention is developed in subclaims. |
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Method of grinding cellulose ether Method involves steps for grinding cellulose ether and a cationic surfactant in a mill and, optionally, drying the mixture. Cellulose ether contains water in amount of 20-90% of total weight of the cellulose ether and water. The cationic surfactant is present in amount of 0.001-2% of the total weight of the mixture. The cationic surfactant is a quaternary ammonium compound. Drying is carried out while grinding, before the grinding step or after the grinding step. The method enables to obtain a product with low dust explosion hazard. |
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Complex modifying additive for construction mortar and method for production of construction mortar Invention is related to compositions of additives for construction mortars and making of construction mortars, which may be used as plastering mortars, putty mixes, glues for tiles, ready construction mortars for erection of monolithic structures, construction mass for leveling of floors, etc. Complex modifying additive for construction mortar contains the following components, wt parts: mineral component - 100, water-retaining active ingredient - cellulose ether - 0.1-1.0, water - 8-50. Additive contains mineral filler and/or filler as mineral components, and also at least one additional active ingredient from group: redispersed polymer powders, water soluble plasticising, air entraining, waterproofing, biocide, accelerating and slowing hardening of construction mortar, pigmenting additives. Construction mortar is produced by mixing of binder with specified additive in the following ratio, wt parts: modifying additive - 100, binder - 10-45. When mixing binder with additive, water may be introduced additionally. |
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Binding compositions with carboxymethylcellulose (cmc) thickening system Ready-for-use composition of drying-type binding mix includes binding substance, thickening system, filler, water and biocide, with thickening system containing non-linked sodium carboxymethylcellulose (CMC) with bottom limit of degree of substitution (DS) of 0.76 and bottom limit of polymerisation degree (DP) of 1000 at amount of 0.01 to 0.6 wt % of the total composition weight. CMC with degree of carboxymethyl substitution (DCMS) over or equal to 0.76, optionally together with non-ionogenic thickening agent, or CMC with DCMS under 0.75 is used as modifier of rheological properties and partial clay substitute in binding compositions. |
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Proposed complex additive contains amylose, hepta magnesium sulfate - MgSO4·7H2O; it contains additionally aluminum hydroxide at the following ratio of components, mass-%: amylose, 10-30; magnesium sulfate, 50-60; aluminum hydroxide, 20-30. |
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Proposed complex additive contains, mass-%: amylose, 10-29; soluble aluminum salt, 50-59; aluminum hydroxide, 20-30. |
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Proposed complex additive includes amylose and additionally silicic acid sol at the following ratio of components, mass-%: amylose, 30-40; silicic acid sol, 60-70. |
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Invention provides water-retention additive for use with Portland cement, lime binder, or Portland cement-lime binder, which additive contains 30-40% amylose and 60-70% soluble aluminum salt. |
Another patent 2551384.