Method of controlled chemical interaction of solid filler surface and additives to produce filler product with treated surface

FIELD: chemistry.

SUBSTANCE: method of producing a filler product comprising calcium carbonate, with treated surface is disclosed, wherein the surface treatment layer comprises at least one mono-substituted succinic anhydride and optionally at least one mono-substituted succinic acid and/or salt product(s) of their interaction. The filler product with treated surface, and a polymer composition containing the mentioned filler product, and a product such as fibre and/or yarn and/or film and/or thread, and a product such as article are also disclosed. The use of mono-substituted succinic anhydride to reduce the hydrophilicity of the filler surface comprising calcium carbonate, and the use of the filler product with treated surface to initiate the cross-linking reaction in epoxide resins are also disclosed.

EFFECT: invention provides a filler with reduced hydrophilicity and mechanical property improvement of articles using it.

36 cl, 2 dwg, 14 tbl, 90 ex

 



 

Same patents:

FIELD: textiles, paper.

SUBSTANCE: material made from natural fibers is dissolved using alkali, without the application of mechanical stress and washed and/or dried if necessary. For dissolving the alkaline material selected from the alkali metal hydroxide, an alkali metal carbonate and alkali metal phosphate is used. The resulting fibrous material is characterised by high strength and low wear. The fibrous material is used in the composite material where the polymer introduced into the fiber structure can be an additional component. The composite material apart from the fiber material comprises the flame retardant and/or other conventional additives as an additional component.

EFFECT: composite material has reduced swelling and water absorption.

23 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention may be used in the chemical industry. A method for the preparation of calcium carbonate from lime involves providing an aqueous solution having pH of at least 11.5 and comprising 10-35 % by weight of a dissolved polyhydroxy compound and 1-5 % by weight of dissolved calcium hydroxide, expressed as Ca(OH)2. The polyhydroxy compound has formula HOCH2(CHOH)nCH2OH, where n ranges from 1 to 6. The solution is treated to remove solids, including suspended solids. Dispersing carbon dioxide through the solution so as to form calcium carbonate with a consequential reduction in the pH of the reaction mixture is executed. During a time period beginning at the start with a sudden short rise in pH and ending with a subsequent fall in pH but before it reaches 9.5 the dispersion of carbon dioxide is terminated and an alkaline reagent is added to maintain pH for the product mixture of at least 9.5. Recovering precipitated calcium carbonate is carried out.

EFFECT: invention enables production of calcium carbonate of higher purity and a uniform particle size.

26 cl, 4 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry 2-amino-2-methyl-1-propanol (AMP) is used as additive to water suspension, which has pH between 8,5 and 11, in order to increase said suspension pH by at least 0,3 pH units Said suspension contains from 25 to 62 vol% of at least one calcium carbonate-containing material AMP is added to said suspension in amount from 500 to 1500 mg per litre of water phase of suspension Change of suspension conductivity is supported within the range 100 mcCm/cm/pH unit.

EFFECT: invention makes it possible to realise processing and transportation of calcium carbonate-containing water suspension basing on measurement of suspension electric conductivity.

21 cl, 4 tbl, 4 ex

FIELD: construction.

SUBSTANCE: to obtain hydrophobic carbonate filler for polymers, by-product of mineral nitrogen fertiliser production, chemical deposit chalk, is dried in fluidised-bed dryer for 2 hours at 200C to reduce humidity to 0.2% or less. Then the dried chalk is fed by pneumatic pipeline to vibration screens 014 and 0045 to remove silica and silicate inclusions. Screened calcium carbonate is fed to ball grinder for reduction during 5 hours. Then calcium carbonate proceeds to separation in magnetic separator. Fine-dispersed calcium carbonate obtained is passed to vortex grinder where it undergoes hydrophobisation by stearic acid used in amount of 0.8% of the calcium carbonate weight at 100C. Hydrophobic calcium carbonate is cooled by cold air and packed up.

EFFECT: possible utilisation of mineral nitrogen fertiliser production waste with obtainment of high-quality hydrophobic carbonate filler for polymers.

2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: claimed invention relates to technical field of obtaining processed products of mineral fillers, containing calcium carbonate, their application in materials of plastics, in film materials, as well as for aromatising products. In the process of obtaining processed product of mineral product (a) at least, one mineral calcium carbonate containing filler, milled in dry state or in wet state, is obtained. Mineral filler is dried. After that (b) at least, one saturated aliphatic carboxylic acid in liquid or melted state is obtained. Mineral filler from stage (a) is brought in contact at one or several stages, with saturated aliphatic carboxylic acid from stage (b). Processing layer is formed. Processed product of mineral filler is applied for plastics, in particular, for applications for breathing or extrusion films of coatings based on polypropylene (PP), polyethylene (PE), polyurethane and/or polyvinylchloride.

EFFECT: obtaining processed products of mineral fillers, containing calcium carbonate.

19 cl, 4 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: method of obtaining a processed product of a mineral filler provides the starting temperature of its volatilisation of at least 220C. The method includes the following stages: (a) obtaining the mineral filler, containing calcium carbonate, with the median size of particles d50 0.3-10 mcm and/or a specific surface area (BET) 1-10 m2/g; (b) obtaining aliphatic aldehyde with the number of carbon atoms from 6 to 14 and viscosity lower than 500 mPasec at 23C; (c) bringing the mineral filler from stage (a) in contact with aliphatic aldehyde from stage (b); and (d) formation of a processing layer on the mineral filler surface. Also described is the application of the processed mineral filler product in methods of plastic processing and a film, containing the said processed mineral filler.

EFFECT: invention provides the processed product of the mineral filler with increased hydrophobic properties and high starting temperature of volatilisation, which contributes to an increase in the quality of plastic products with its application.

17 cl, 1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in paint and paper production. The additive used for an aqueous suspension of at least one material containing calcium carbonate is 2-aminoethanol in amount of 500-15000 mg, preferably 1000-5000 mg, and more preferably 1300-2000 mg, per litre of the aqueous phase of said suspension. The suspension has pH in the range of 8.5-11 and contains 25-62 vol.% of at least one material containing calcium carbonate, with respect to the total volume of the suspension. The pH of the suspension increases by at least 0.3 pH units, and specific conductivity of the suspension changes by not more than 100 mcS/cm per pH unit.

EFFECT: invention improves stability with respect to specific conductivity of suspensions containing calcium carbonate.

20 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in the chemical industry. A method of modifying the surface of a mineral material, which is in the form of water sludge or suspension, having pH from 5 to 10, includes addition of, at least, one agent to the said mineral material. The said agent is added in an amount, corresponding to 0.04-1 mg counted per dry weight of the agent per m2 of the total surface of the mineral material. Suspension of the mineral material, which has pH value constituting less than 10 and higher than 7, if a value of an isoelectric point of the said mineral material exceeds 7, and exceeds the value of the isoelecric point of the said material, if the value of the said isoelectric point constitutes 7 or lower. The said agent is in the form of a water solution or a stable water colloid, which has pH lower than 6, and is formed as a result of mixing in a water medium of, at least, one compound, containing phosphonic acid with one or more metal cations or one or more metal-containing cationic compounds. The said metal is selected from the group, consisting of aluminium, zirconium, zinc, cobalt, chrome, iron, copper, tin, titanium and their mixtures. The compound, which contains phosphonic acid and the said cations of metals or the cationic metal-containing compounds, is added in such amount that a molar ratio of phosphonate hydroxyl groups to the metal cation or the metal-containing cationic compound constitutes from 10:1 to 2:1.

EFFECT: invention makes it possible to form filtration or centrifuged sediment of a small volume with high content of solid substances after suspension dehydration.

26 cl, 5 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in production of paper, paints and plastics. A method of obtaining calcium carbonate with a surface subjected to reaction processing in water medium includes a) supply of at least one type of ground natural calcium carbonate (GNCC); b) supply of at least one water-soluble acid; c) supply of gaseous CO2; d) contact of the said GNCC with the said acid and CO2. The said acid of stage b) has pKa higher than 2.5 and lower or equal to 7, measured at 20C, connected with ionisation of the first available hydrogen, and respective anion, formed with a loss of the said first available hydrogen, capable of forming water-soluble calcium salts. After the contact of the said acid with GNCC supplied is at least one water-soluble salt, which has pKa higher than 7, measured at 20C, connected with ionisation of the first available hydrogen. The salt anion is capable of forming water-insoluble calcium salts, with cation of the said water-soluble salt being selected from the group, consisting of potassium, sodium, lithium and their mixtures. The anion of the said water-soluble salt is selected from the group, consisting of phosphate, dihydrophosphate, monohydrophosphate, oxalate, silicate, their mixtures and hydrates.

EFFECT: invention makes it possible to increase specific surface of calcium carbonate surface without application of moderately strong and strong acids.

28 cl, 1 tbl, 7 ex

FIELD: process engineering.

SUBSTANCE: this invention can be used for production of paper, plastics and dyes. Proposed method comprises provision of calcium carbonate, provision of acid in amount of 5-50 wt % per calcium carbonate mass with pKa smaller than or equal to 2.5; provision of gaseous CO2, provision of at least one water-soluble non-polymer organic and/or inorganic weak acid and/or acid salt of said at least one water-soluble non-polymer organic and/or inorganic weak acid. Then, calcium carbonate is brought in contact with at least acid with pKa smaller than or equal to 2.5; provision of gaseous CO2, provision of at least one water-soluble non-polymer organic and/or inorganic weak acid and/or acid salt of said at least one water-soluble non-polymer organic and/or inorganic weak acid. Note here said water-soluble non-polymer organic and/or inorganic weak acid features pKa larger than 2.5 while anion of appropriate acid can form water-insoluble calcium salts.

EFFECT: controlled particle size, higher specific surface and yield.

23 cl, 7 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: method of producing calcium carbonate-containing materials, the surface of particles of which has improved dispersant adsorption properties, comprises the following steps: a) producing at least one calcium carbonate-containing material in form of an aqueous suspension or in dry form; b) producing at least one lithium ion-containing compound selected from a group comprising lithium hydroxide or lithium oxide or inorganic and/or organic monomer lithium salts selected from a group comprising mono- or polybasic acid salts, e.g., lithium carbonate, lithium sulphate, lithium citrate, lithium bicarbonate, lithium acetate, lithium chloride, lithium phosphate, in dry form or in aqueous form, and mixtures thereof; c) a combination of at least one lithium ion-containing compound from step (b) and at least one calcium carbonate-containing material from step (a).

EFFECT: invention enables to obtain a calcium carbonate-containing material in dry form or in form of a suspension, having high concentration of dry substance and low Brookfield viscosity, which retains stability over time, and good pH buffering capacity.

44 cl, 2 dwg, 10 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention may be used in the chemical industry. A method for the preparation of calcium carbonate from lime involves providing an aqueous solution having pH of at least 11.5 and comprising 10-35 % by weight of a dissolved polyhydroxy compound and 1-5 % by weight of dissolved calcium hydroxide, expressed as Ca(OH)2. The polyhydroxy compound has formula HOCH2(CHOH)nCH2OH, where n ranges from 1 to 6. The solution is treated to remove solids, including suspended solids. Dispersing carbon dioxide through the solution so as to form calcium carbonate with a consequential reduction in the pH of the reaction mixture is executed. During a time period beginning at the start with a sudden short rise in pH and ending with a subsequent fall in pH but before it reaches 9.5 the dispersion of carbon dioxide is terminated and an alkaline reagent is added to maintain pH for the product mixture of at least 9.5. Recovering precipitated calcium carbonate is carried out.

EFFECT: invention enables production of calcium carbonate of higher purity and a uniform particle size.

26 cl, 4 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in producing pigments for white paints and coatings, including thermal control coatings. Producing solid solution powders Ba(1-x)SrxTiO3 is ensured by mixing barium carbonate BaCO3, strontium carbonate SrCO3 and titanium dioxide TiO2 powders in the required weight parts. The prepared mixture is heated. The mixed powders are heated sequentially: 2 hours at 800C, then after cooling down, 2 hours at 1,200C.

EFFECT: invention enables avoiding the high-temperature heating, compaction and disintegration in producing the solid solution powders Ba(1-x)SrxTiO3, increasing the yield.

1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry 2-amino-2-methyl-1-propanol (AMP) is used as additive to water suspension, which has pH between 8,5 and 11, in order to increase said suspension pH by at least 0,3 pH units Said suspension contains from 25 to 62 vol% of at least one calcium carbonate-containing material AMP is added to said suspension in amount from 500 to 1500 mg per litre of water phase of suspension Change of suspension conductivity is supported within the range 100 mcCm/cm/pH unit.

EFFECT: invention makes it possible to realise processing and transportation of calcium carbonate-containing water suspension basing on measurement of suspension electric conductivity.

21 cl, 4 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to composition for beta-nucleation of polypropylene and method of its obtaining. Composition represents particles of natural mineral solid substrate, the surface of which has salt of dicarboxylic acid, where dicarboxylic acid contains from 7 to 10 carbon atoms, and dispersive and/or milling agent. Particles of natural mineral solid substrate contain compound of group 2 metal by IUPAC, which is selected from natural milled calcium carbonate, magnesium-calcium carbonate or any of their mixtures. Natural milled carbonate is selected from marble, limestone, chalk or any their mixture, and magnesium-calcium carbonate represents dolomite.

EFFECT: composition is an effective beta-nucleation agent, which ensures high impact viscosity of polypropylene.

14 cl, 3 tbl, 27 ex

FIELD: construction.

SUBSTANCE: to obtain hydrophobic carbonate filler for polymers, by-product of mineral nitrogen fertiliser production, chemical deposit chalk, is dried in fluidised-bed dryer for 2 hours at 200C to reduce humidity to 0.2% or less. Then the dried chalk is fed by pneumatic pipeline to vibration screens 014 and 0045 to remove silica and silicate inclusions. Screened calcium carbonate is fed to ball grinder for reduction during 5 hours. Then calcium carbonate proceeds to separation in magnetic separator. Fine-dispersed calcium carbonate obtained is passed to vortex grinder where it undergoes hydrophobisation by stearic acid used in amount of 0.8% of the calcium carbonate weight at 100C. Hydrophobic calcium carbonate is cooled by cold air and packed up.

EFFECT: possible utilisation of mineral nitrogen fertiliser production waste with obtainment of high-quality hydrophobic carbonate filler for polymers.

2 tbl, 2 ex

FIELD: process engineering.

SUBSTANCE: invention can be used for production of preservation lubricants. To make antirust pigment, the mix of slimes of electroplating effluents suspensions and engineering products neutralisation bath wastes containing calcium hydroxide is heat treated at 900C for one hours. Heat-treated product is ground by electromagnetic grinders with application of variable electromagnetic field and working elements composed of barium hexaferrite driven by said field. Grinding is performed to particle size of 3-4 mcm.

EFFECT: higher corrosion resistance of produced pigment.

2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: claimed invention relates to technical field of obtaining processed products of mineral fillers, containing calcium carbonate, their application in materials of plastics, in film materials, as well as for aromatising products. In the process of obtaining processed product of mineral product (a) at least, one mineral calcium carbonate containing filler, milled in dry state or in wet state, is obtained. Mineral filler is dried. After that (b) at least, one saturated aliphatic carboxylic acid in liquid or melted state is obtained. Mineral filler from stage (a) is brought in contact at one or several stages, with saturated aliphatic carboxylic acid from stage (b). Processing layer is formed. Processed product of mineral filler is applied for plastics, in particular, for applications for breathing or extrusion films of coatings based on polypropylene (PP), polyethylene (PE), polyurethane and/or polyvinylchloride.

EFFECT: obtaining processed products of mineral fillers, containing calcium carbonate.

19 cl, 4 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: method of obtaining a processed product of a mineral filler provides the starting temperature of its volatilisation of at least 220C. The method includes the following stages: (a) obtaining the mineral filler, containing calcium carbonate, with the median size of particles d50 0.3-10 mcm and/or a specific surface area (BET) 1-10 m2/g; (b) obtaining aliphatic aldehyde with the number of carbon atoms from 6 to 14 and viscosity lower than 500 mPasec at 23C; (c) bringing the mineral filler from stage (a) in contact with aliphatic aldehyde from stage (b); and (d) formation of a processing layer on the mineral filler surface. Also described is the application of the processed mineral filler product in methods of plastic processing and a film, containing the said processed mineral filler.

EFFECT: invention provides the processed product of the mineral filler with increased hydrophobic properties and high starting temperature of volatilisation, which contributes to an increase in the quality of plastic products with its application.

17 cl, 1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: application of 2-((1-methylpropyl)amino)ethanol as an additive to a water suspension, containing from 25 to 62 volume % of at least one calcium carbonate-containing material to increase the suspension pH value.

EFFECT: invention provides an improved viscosity stability with the minimal increase of the suspension conductivity.

20 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in the chemical, paint-and-varnish, food, pharmaceutical industry, and in paper production. A method of a mineral substance classification includes the classification in a gaseous medium of at least one mineral substance, which includes dolomite, or talc, or titanium dioxide, or aluminium oxide, or kaolin, or calcium carbonate, or their mixtures in the presence of at least one additive, which promotes the classification. The said additive includes glycerol in an aqueous or pure form or glycerol with one or more agents or one or more polyglycerols in the absence of glycerol. The classification results in obtaining at least two fractions of particles with different average size.

EFFECT: invention makes it possible to increase the air classification efficiency, prevent agglomeration of particles, reduce specific energy of classification with obtaining the mineral substance for further application in a water medium.

27 cl, 2 tbl, 1 ex

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