Method of producing iron oxide pigments with anticorrosion properties

FIELD: paint industry.

SUBSTANCE: invention can be used in paint industry for production of primers and protective coatings. To obtain iron oxide pigment with anticorrosion properties calcined alumina production wastes – red mud. Before calcination red sludge is separated according to grain size with extraction of fraction up to 0.02 mm and additionally from 0.02 to 0.045 mm. Said fraction treated with phosphoric acid while heating to pH = 6, suspension is filtered, dried, calcined in air, cooled and milled. When backing at temperature of 200–250 °C obtaining brown pigment. In case of calcination at temperature 600–650 °C red pigment colour is obtained.

EFFECT: invention enables to obtain iron oxide pigments with spreading capacity 8–10 g/m2 using red mud without additional raw materials and additives, eliminating harmful emissions into environment.

1 cl, 1 tbl, 1 ex



Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry and concerns a method for producing an additive in the form of hard fibres, wherein the said additive is storage stable and based on the eco-friendly polyamide acid; the said additive in a salt state can be used for the production of composite materials and metal coatings. The method for polyamide acid salt production comprises forming a polyamide acid fibre cocoon by mixing 13.0-13.5 wt % polyamide acid solution in dimethylformamide with distilled water while stirring at the rate of 50 rev/min. The obtained cocoon is washed with distilled water, and separated into individual fibres to dry in the air and then at 120-130°C for 60 min in a cabinet drier, in a vacuum thermostat at 79-81°C and a pressure of 1 atm. to reduce dimethylformamide content down to 3.68 wt %, followed by dissolving the fibres in a mixture of N-methylpyrrolidone, monoethanolamine and water to obtain the said salt. A method for producing coatings based on fluoropolymers with polyamide acid salt or polyamide acid-based also disclosed.

EFFECT: storage stable polyamide acid in the form of fibres, improved quality of polyamide acid and composite materials based on fluoropolymers and polyamide acid, improved antiadhesive and antifriction coatings.

3 cl, 2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: method involves preparing a steel surface, applying a polymer layer by immersing the surface into a bath with an aqueous solution of an oligomer, and curing the applied polymer layer. Preparing the surface involves removing oxidised films and de-fatting. The polymer protective coating is cured at room temperature; the oligomer is N-octofluorpentyl-substituted oligocaproamide.

EFFECT: invention enables producing the protective coating exhibiting hydrophobic and anti-corrosion properties of the steel surface.

1 tbl, 3 ex

Enamel // 2550875

FIELD: chemistry.

SUBSTANCE: enamel contains a hydroxyl-containing copolymer based on vinyl chloride with vinyl acetate, a hydroxyl-containing fluoropolymer based on fluoroethylene vinyl esters with hydroxyl number of 52-100 KOH/g, pigments: bismuth vanadate, and/or nickel titanate, and/or cadmium red, and/or chromium titanate, and/or chromium oxide, and/or cobalt ferrite, and/or manganese oxide, and/or zinc aluminate, and/or mixed cobalt and zinc oxides, and/or cobalt aluminate, filler materials, aerosil, a curing agent and organic solvents.

EFFECT: faster drying of the coating, improved elasticity and adhesion of the coating, high water resistance, low dirt retention of the coating, high durability of the enamel and improved decorative properties of the coating during use.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to field of paint-and-varnish coatings. Epoxy-caoutchouc composition for protective coatings contains film-forming substance, which includes epoxy-caoutchouc adduct, oligoetherepoxide, pigments, fillers and hardening agent. Epoxy-caoutchouc adduct is obtained in presence of polysulfide low molecular caoutchouc in equimolar quantity to butadiene-nitrile caoutchouc and excess of low molecular epoxy resin, taken in quantity 13-17 mole per mole of caoutchoucs.

EFFECT: invention provides coatings based on claimed composition, possessing increased electrical insulation properties, as well as stability to temperature influences from -50 to +100°C and hydrostatic pressure 80·105 Pa.

4 cl, 1 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to polyisocyanurate reactive compositions which are well suited for anticorrosion, wear-resistant coatings. Described is a polyisocyanate-based non-syntactic coating composition obtained by reacting an organic polyisocyanate with a compound containing isocyanate-reactive hydrogen atoms with an isocyanate index of more than 1000% in the presence of a trimerisation catalyst and in the absence of polymeric polyols. The invention also describes a reaction mixture for producing a polyisocyanate-based non-syntactic coating composition, use of the polyisocyanate-based coating composition, a method of inhibiting corrosion of metal surfaces and article comprising a substrate and a film coating on the substrate, where said film coating contains the coating composition.

EFFECT: when applied as a coating on metal substrates, providing excellent corrosion inhibition, fast curing at slightly high temperature, enabling use at high temperature, excellent adhesion and flexibility, very good impact resistance, low transfer of wet steam, as well as minimal cathodic disbonding, ie delamination due to corrosion.

12 cl, 2 ex, 2 tbl, 2 dwg

FIELD: chemistry.

SUBSTANCE: aqueous-dispersion anticorrosion primer includes a film-forming agent, a hydrophobic dispersant, a polyurethane thickener, an antifoaming agent, anticorrosion pigments, filler materials, coalescents, a neutralising agent and a solvent. The film-forming agent used is a NeoCryl XK styrene-acrylic dispersion, the hydrophobic dispersant is a high-molecular weight copolymer of acrylic acid with groups having affinity for pigments, obtained via controlled polymerisation, the polyurethane thickener used is a nonionic hydrophobically modified ethylene-based composite urethane copolymer and a urea-modified polyurethane with a branched structure, the antifoaming agent used is polyester siloxane copolymers containing colloidal silica, the anticorrosion pigments used are a complex of anticorrosion additives - aluminized zinc phosphate, red iron oxide pigment, zinc tetraoxychromate, strontium chromate, sodium nitrite, the filler materials used are barium sulphate, calcium carbonate, talc, mica, the coalescents used are dipropylene ether of mono n-butyl ether, butyl glycol, tripropylene glycol butyl ether, the solvent is water, with a defined ratio of components.

EFFECT: invention enables to obtain a coating which is resistant to negative climatic factors, mineral oil and different solvents.

6 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: anticorrosion coating composition contains an epoxide oligomer, polyethylene polyamine, zinc powder, a solvent - mixture of xylene and butanol in weight ratio of 1:1 and a target additive. The target additive is glycidoxypropyltrimethoxysilane. The anticorrosion composition contains components in the following ratio, wt %: epoxide oligomer 25.7, polyethylene polyamine 2.3, zinc powder 42, said mixture of xylene and butanol 29.79-29.84, glycidoxypropyltrimethoxysilane 0.16-0.21.

EFFECT: invention simplifies implementation and reduces power consumption when preparing the anticorrosion coating composition, improves corrosion resistance of steel by reducing the electrochemical potential of steel compared to that of prototype steel with improved physical and mechanical properties of coatings.

2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: heat insulating paint coat contains a film-forming agent in the form of an aqueous emulsion of a copolymer of styrene and acrylic monomers Akremos-101, a thickener in the form of an aqueous emulsion of a copolymer Akremos-401, a dispersant in the form of sodium polyphosphate, an antifreeze agent in the form of diethylene glycol, a coalescing additive in the form of white spirit, mineral filler and water; the paint further contains glass microspheres based on sodium borosilicate glass, wherein the mineral filler is diatomite and white soot, with the following ratio of components, wt %: aqueous emulsion of a copolymer of styrene and acrylic monomers Akremos-101 17.5-22.46, aqueous solution of an acrylic copolymer Akremos-401 4.28-5.46, diethylene glycol 10.27-13.10, sodium polyphosphate 3.85-4.91, white spirit 2.57-3.27, diatomite 6.06-13.63, white soot 3.06-5.12, microspheres based on sodium borosilicate glass 6.06-7.50, water - the balance.

EFFECT: heat insulating paint coat has low heat conductivity and density while providing sufficient adhesive strength of the coating.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to protective coatings, a fastener and other surfaces coated with said coatings, for example, such coatings and fastener, which are capable of protecting one or both of two different metals connected together, from corrosion or damage, such as structural corrosion or decomposition. The corrosion-resistant coating composition includes inorganic salts and an alkaline salt of poly(3-ammonium propylalkoxy siloxane)carboxylic acid (PCAS) as a corrosion inhibitor, suspended in a residue containing a phenol-formaldehyde thermosetting resin. The coating material can be deposited on metal articles, but not limited to an aircraft fastener, such as aircraft fastening components, including nuts and bolts, screws and rivets.

EFFECT: coating does not contain chromate, but is as effective in preventing corrosion as coatings containing chromate.

14 cl, 5 dwg, 2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to chemical and machine-building industry and repairing equipment by applying polymer coatings on metal articles and machine components, particularly mounting seats of bearings in metal parts of machines. The coating composition contains the following components (in wt %): lacquer F-40 - 87-88; aluminium powder PAP-1 - 11.5-12.0 and bronze powder B1PP-1 - 0.5-1.0, having defined grain-size compositions.

EFFECT: invention reduces hardening temperature and time, reduces power consumption in thermal treatment of the deposited polymer coating and improves deformation-strength properties of films made from the coatings.

2 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: to obtain brown iron oxide pigment red mud - waste of alumina production - is annealed. Before annealing red mud is divided by classes of coarseness with selection of fraction to 0.01 mm. Annealing of this fraction is realised in air at temperature 220-280°C. Invention makes it possible to obtain pigment of brown colour with hiding power 8-9 g/m2 without additional additives.

EFFECT: reduction of amount of harmful emissions into the environment.

1 tbl

FIELD: chemistry.

SUBSTANCE: iron oxide pigment contains α-modified iron (III) oxide with a plate-like crystal shape. Content of Fe2O3 in the pigment is 97-99 wt %. The crystals have average diameter of 0.1-0.8 mcm, with the ratio of the diameter to the thickness of the crystals of 0.1-0.2. The method of producing iron oxide pigment includes oxidative hydrolysis of aqueous iron (II) sulphate solutions at 10-40°C, followed by hydrothermal treatment of the formed products in an alkaline medium at 150-250°C. Hydrolysis of the suspensions obtained from the aqueous iron (II) sulphate solutions is carried out at pH=10-13, and oxidation is carried out with hydrogen peroxide.

EFFECT: invention reduces the average size of iron oxide crystals for use in paint compositions with low viscosity of the binder, particularly in water-dispersed compositions.

2 cl, 1 tbl, 7 ex

FIELD: construction.

SUBSTANCE: method of iron oxide pigment obtainment involves separation of fraction up to 10 mm size from metallurgical gas treatment slime of fine-dispersed dust, fraction dehydration by drying, and further reduction. Separated fraction is reduced to 1-10 mcm grain size. Afterwards, particles exceeding 10 mcm are separated by vibration screen and returned for additional reduction.

EFFECT: possible utilisation of metallurgical waste of gas treatment, with obtainment of iron oxide pigments suitable for dying of construction materials, such as silicate brick, ceramic tile.

2 cl, 1 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: method of producing magnetite includes oxidising iron during electrolysis. The process is carried out in a three-electrode double-anode electrolysis cell into which 1M sodium hydroxide solution is fed and current is supplied. Voltage is equal to 10 V; cathodic current density on a titanium cathode is equal to 0.2 A/cm2; anodic current density on a St3 anode is equal to 0.3 A/cm2, and on a lead dioxide anode on a titanium base is equal to 0.1 A/cm2. The method includes simultaneous dissolution of the St3 anode and release of oxygen at the lead dioxide anode on a titanium base.

EFFECT: invention enables to obtain magnetite without supplying oxygen to oxidise iron and improves purity of the product.

1 ex

FIELD: mining.

SUBSTANCE: proposed process comprises ore screening, magnetic separation to obtain magnetic and nonmagnetic fractions, grinding, hydraulic classification, thickening and drying. Martite ore is first subjected to screening with separation to three size classes, i.e. coarse, intermediate and fine. Coarse class is directed to sensory separation to obtain tails and concentrate to be additionally ground and screened to intermediate and fine classes. Intermediate class is conveyed to metallurgical processing while fine class is subjected to pelletising. Hydrohematite ore is first subjected to screening with separation to three size classes, i.e. coarse, intermediate and fine. Coarse class is directed to sensory separation to obtain tails and concentrate to be additionally ground and screened to intermediate and fine classes. Intermediate class is conveyed to metallurgical processing. Portion of fine class is directed for pelletising while another portion is directed to magnetic separation, its magnetic fraction is fed for pelletising. Nonmagnetic fraction is ground with mixing by grinding medium and directed to hydraulic classification of the first stage. Classification sands are returned to the mill. Sink is fed to second stage of classification, its sink being used as 3rd grade pigment after thickening and drying. Sands of second classification are fed to second stage of grinding with mixing by grinding medium. Product ground at second stage is subjected to 3rd stage hydraulic classification, its sands being dried and used as 2nd grade pigment. Thereafter, sink is thickened, dried and used as 1st grade pigment.

EFFECT: simultaneous production of several grades of iron oxide pigment and finished stock for metallurgy.

2 cl, 1 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: anticorrosion pigment is produced from electric furnace wastes from foundry production - aspiration fines, containing, wt %: Fe2O3 63.9-70.0, FeO 7.0-11.32, SiO2 8.9-16, Al2O3 1.45-3.12. The aspiration fines are mixed in dry form with dolomite powder containing magnesium and calcium bicarbonate in amount of 80-95 wt %, with the ratio of aspiration fines to dolomite powder of 60-40:40-60 wt %, respectively. The obtained mixture is calcined for 3-5 hours at temperature of 700-800°C.

EFFECT: invention simplifies production of the anticorrosion pigment and lowers the calcining temperature.

1 tbl, 28 ex

FIELD: chemistry.

SUBSTANCE: invention relates to obtaining biocompatible magnetic nano-particles and can be applied for therapeutic purposes, in particular, for fighting cancer. Method of obtaining nano-particles, including iron oxide and silicon-containing casing and having value of specific absorption rate (SAR) 10-40 W per g of Fe with field strength 4 kA/m and frequency of alternating magnetic field 100 kHz, contains the following stages: A1) preparation of composition of at least one iron-containing compound in at least one organic solvent; B1) heating of composition to temperature in range from 50°C to temperature 50°C lower than temperature of reaction of iron-containing compound according to stage C1 for minimal period 10 minutes; C1) heating composition to temperature between 200°C and 400°C; D1) purification of obtained particles; E1) suspending purified nano-particles in water or water acid solution; F1) addition of surface-active compound to water solution, obtained according to stage E1); G1) processing of water solution according to stage F1) by ultrasound; H1) purification of water dispersion of particles, obtained according to stage G1); I1) obtaining dispersion of particles according to stage H1) in mixture of solvent from water and water-mixable solvent; J1) addition of alkoxysilane into dispersion of particles in mixture of solvent according to stage I1); and K1) purification of particles.

EFFECT: invention makes it possible to obtain biocompatible magnetic particles with high value of specific absorption rate (SAR).

42 cl, 3 dwg, 9 ex

FIELD: process engineering.

SUBSTANCE: invention may be used in paint-and-lacquer, pharmaceutical, cosmetic, food and metallurgical industries. Proposed method comprises iron ore crushing, grinding, wet magnetic separation to produce magnetic and nonmagnetic fractions, ultrasound oxidation destruction of nonmagnetic fraction, hydraulic classification, thickening and drying. Stage-by-stage hydraulic classification comprises primary classification and, at least, two cleaner classification. Magnetic fraction and sand of primary classification are pelletised using molasses as binder in amount of 1-5 wt% at moisture of pelletised blend of 8-12%.

EFFECT: iron oxide coloring agents and pelletised raw stock for metallurgy.

2 cl, 3 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: to obtain iron oxide pigments, iron oxide sludge, which is a water treatment waste, is dried, calcined and ground. The water treatment wastes used are ferruginous underground water with iron content of not less than 42%. Calcination is carried out by gradually heating the dried iron oxide sludge either to temperature of 600°C in order to obtain a chocolate brown pigment, or to temperature of 800°C in order to obtain a bright red pigment, or to temperature of 1050°C in order to obtain a black pigment. Once the required temperature is reached, the calcination device is turned off.

EFFECT: invention enables to recycle wastes of water treatment plants to obtain iron oxide pigments for coloured concrete, paving slabs, prime coats, enamel and paints.

2 cl, 1 dwg, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: anticorrosive pigment is obtained from a mixture of pigment components of oxygen-containing metal compounds. The method of producing pigment involves heat treatment of the mixture and grinding the heat treated product. The anticorrosive pigment is produced from a suspension of its components. The anticorrosive pigment additionally contains a pigment inhibitor-component which is a waste from neutralisation baths of machinery production, with the ratio of components galvanic sludge: inhibitor-component equal to 1:1 (on iron and calcium oxides) based on calcium contained in the galvanic sludge.

EFFECT: obtaining cheap highly resistant anticorrosive pigments with a ferrite structure, obtained from galvanic sludge, and wide field of their use.

2 ex, 1 tbl, 1 dwg

FIELD: varnish-and-paint industry.

SUBSTANCE: invention is intended for use in chemical industry and construction for preparing varnishes, paints, and rubber products. Gas treatment slime from converter industry is fractioned, fraction up to 10 mm is dehydrated by drying at 70-110°C to at most 5% moisture content and reduced to particles not exceeding 300 μm in size. Color spectrum of product is extended from red to black by calcining disintegrated product at 300 to 900°C. Content of iron oxides in pigment is much higher than in pigments prepared using known processes.

EFFECT: widened resource of raw materials, utilized converter industry waste, and reduced price of product.

2 cl, 1 tbl, 6 ex