A method of obtaining a pearlescent pigment based on mica

 

(57) Abstract:

The invention relates to a technology of inorganic pigments, in particular pearlescent pigment used in the paint industry, in the manufacture of decorative plastic film materials, cosmetics, etc. of the invention: heating a suspension of powdered mica in solution containing titanium sulfate and sulfuric acid, to achieve the degree of precipitation of titanium hydroxide in terms of TiO250 - 70%, the additional introduction of titanium sulfate at a rate of 0.1 - 0.3 wt.h. TiO21 wt.h. mica and heating the suspension up to 75 - 90oC followed by filtering the suspension, washing with water until pH 2 to 4, and then liquid glass to pH 6 to 8, the drying separated by filtering the precipitate and roasting. The implementation of this method allows about 1.5 times increase of the content in pearlescent pigments TiO2associated with particles of mica, and reduce the rate of water consumption by 30 - 35%, which improves the possibility of their application. table 1.

The invention relates to a technology of inorganic pigments, in particular pearlescent pigment used in the paint industry, in the production of decorative the walls of a method of obtaining a pearlescent pigment based on mica with a high content of titanium dioxide (ed. St. USSR N 1574614 class. C 09 C 1/36, 1/40, B N 24, 1990). This method involves coating the particles of mica hydroxide of titanium in several layers with intermediate separation of the precipitate from the suspension, washing it, and the suspension in fresh titanium containing solution. This method is time-consuming, which is to his disadvantage.

A method of obtaining pearlescent pigment with a homogeneous particle surface and good quality of the final product (ed. St. USSR N 1611911 class. C 09 C 1/36, 1990). This method consists in the fact that crushed mica before application to the surface of titanium hydroxide shell method of thermal hydrolysis titanium containing sulphate solution is treated with a solution of ammonium fluoride containing 1 to 5 wt. NH4F. By a known method mica treated with ammonium fluoride, suspendered in solution titanylsulphate, the consumption of which is taken at the rate of 10 wt. TiO2the weight of the mica, the suspension is heated to 95oC for hydrolysis of titanyl sulfate, then separate covered with flakes of mica, washed them, dried and calcined at 800oC. Get the pigment with good quality plates and uniform coating layer. The disadvantages of this method include low content of titanium dioxide in pigmente. Additionally, the fluoride ion in the wastewater, the accompanying process flow, creates economic problems.

The task of the invention is improving the quality of the pigment due to the increase of the content of titanium dioxide and surface modification of pigment particles of compounds of silicon.

This object is achieved in that the heating of the suspension of the crushed mica are to achieve the degree of precipitation of titanium hydroxide in terms of TiO250 to 70% then type titanium sulfate at a rate of 0.1 to 0.3 wt.h. TiO21 wt. including mica, and the resulting suspension is heated to 75 of the 90oC, and washing the filtered precipitate lead water to pH 2 to 4 and obtained by washing the precipitate, the suspension is mixed with a solution of liquid glass to pH 6 8 followed by filtration of the suspension.

The essence of the method consists in the following.

Crushed mica suspended in a solution containing titanium sulfate and sulfuric acid (content of titanium at a rate of 10 wt. TiO in relation to the weight of mica, H2SO4free. 10 20% T W 1 10), heat the suspension to achieve the degree of precipitation of titanium hydroxide in terms of TiO250 to 70% Then the suspension is injected sulfate titanium is e 2 3 h, hold the filter with separation of the precipitate, which is washed with water by the method of repulpable to pH 2 to 4. When reaching the specified value, the suspension is washed precipitate is mixed with a solution of liquid glass to pH 6 to 8. The thus treated precipitate after separation of the liquid phase is dried and calcined at 800oC. Implementation of the proposed method is accompanied by the hydrolysis of titanium sulfate and deposition gidratirovannykh particles on the mica particles in the two layers, providing a more dense coating layer than in the method prototype. The content of TiO2the pigment (associated with particles of mica) is 25 to 30% Pigment has a silver (slight yellowish tint) color with a characteristic luster. The flushing of sediment, highlighted by heating water and then with liquid glass, modifies the surface of the sediment, resulting in the reduction of water consumption of the final product.

The upper limit of the degree of deposition of titanium (IV) 70% TiO2is determined by the fact that its excess leads to the deterioration of the color pigment in a large yellow tint. When the degree of precipitation of less than 50% of the observed increase in the content of TiO2not associated with particles of mica (free), resulting in reduced gloss. Boratory 90oC leads to an increase in the content of the pigment free TiO2and the deterioration of its decorative properties. At a flow rate of titanium sulfate < 0.1 wt.h. TiO21 wt.h. mica and a temperature of less than 75oC has a reduced content of TiO2in the final product.

When washing water obtained by heating the sludge to pH < 2 formed a "thick" coating the surface of the pigment oxide silicon compound that affects the luster pigment. To achieve when washing the pH of the suspension > 4 required a significant increase in wash water (5 to 8 times), and the reduction of water consumption is virtually the same. Additive liquid glass wash suspension of calculation of pH < 6 does not provide the uniformity of coating the surface of the pigment and the consumption of it increases. At pH > 8 in the pigment gets excessive, resulting in increased quantities of water-soluble salts.

Example 1 (method prototype). Take 1 kg of crushed mica treated with ammonium fluoride, suspended it in 10 l of a solution titanylsulphate containing 100 g of TiO2that is 10 wt. to the mass of mica. The mixture is heated to 95oC for hydrant titanylsulphate. The obtained flakes of mica is separated from the reaction stost 90 g/m2.

Example 2. Take 1 kg of crushed mica, suspended it in 10 l of a solution titanylsulphate and heat the suspension to achieve the degree of precipitation of titanium hydroxide in terms of TiO250% then hydrolyzed again introduce the titanium sulfate at the rate of 0.3 wt.h. TiO21 wt.h. mica and the resulting suspension heated at 90oC for 3 hours and Then the precipitate was separated from the liquid phase, washed with water to pH 2 and the resulting suspension is mixed with liquid glass (d 1,14 g/cm3) to pH 6 and after stirring for 30 min, the suspension is filtered. The precipitate after drying, calcined at 800oC for 30 minutes Calcined product is a pigment with a characteristic pearlescent (slight yellow tint). The content of TiO229.2% of the consumption of the 87,4% opacity 40 g/m2.

Example 3. Take 1 kg of crushed mica, suspended her for 10 l of a solution of titanium sulfate and sulfuric acid and heat the suspension to the point of precipitation of titanium hydroxide in terms of TiO260% In the hydrolysate again sulfate titanium per TiO20.2 wt.h. 1 wt.h. mica and incubated at a temperature of 85oC for 2.5 hours and Then the precipitate was separated from the liquid phase, washed with water to pH 3 and Poluchenie filtered. The precipitate after drying, calcined at 800oC for 30 minutes the Product is a pigment silver in colour with a characteristic pearlescent. The content of TiO226.5% of the consumption of 85,4% opacity 48 g/m2.

Example 4. Take 1 kg of crushed mica, suspended it in 10 l of a solution titanylsulphate and heat the suspension to the point of precipitation of titanium hydroxide in terms of TiO270% hydrolyzed again introduce the titanium sulfate per TiO2(0.1 wt.h. 1 wt.h. mica), and at a temperature of 75oC withstand a mixture of 2 hours and Then the precipitate was separated from the liquid phase, washed with water to pH 4, and the resulting suspension is mixed with liquid glass (d - 1,14 g/cm3) and after stirring for 30 minutes the suspension is filtered. The precipitate after drying, calcined at 800oC for 30 minutes Calcined product is a pigment silver in colour with a characteristic pearlescent. The content of TiO225.0% of the water consumption of 83.1% of the opacity of 46.4 g/m2.

The table shows the results obtained when implementing the proposed method of examples 1 to 3, with transcendent values 4 8 data prototype (example 9). the

From the analysis of experimental DNA with a high content of TiO2with a distinctive silvery sheen and low values of water are formed by heating a suspension of powdered mica in solution of titanium sulfate and sulfuric acid to achieve the degree of deposition of titanium 50 to 70% (TiO2), followed by separation in the hydrolyzate of the titanium sulfate at a rate of 0.1 to 0.3 wt.h. TiO21 wt.h. mica and the mixture heated at 75 90oC; rinsing obtained by heating the precipitate with water until pH 2 to 4 and introduction to the suspension of liquid glass to pH 6 to 8.

The proposed method is compared with the prototype allows about 2.5 times the content of the pigment TiO2associated with particles of mica, and reduce the indicators of water consumption by 30-35% ukryvistosti twice. Such properties allow the use of pearlescent pigment in the production of cosmetic and paint materials, as well as for the preparation of coating concentrates for coloring leather.

A method of obtaining a pearlescent pigment based on mica, comprising heating a slurry of crushed mica in solution containing titanium sulfate and sulfuric acid, filtering the suspension, washing, drying and calcination of the precipitate, characterized in that the heating of a suspension of mica are to achieve the account of 0.1 to 0.3 wt.h. TiO21 wt.h. mica and the resulting suspension is heated to 75 of the 90oC, and washing the filtered precipitate lead water to a pH of 2 to 4 and obtained by washing the precipitate, the suspension is mixed with a solution of liquid glass to pH 6 8 followed by filtration of the suspension.

 

Same patents:

Aluminum paste // 2092509
The invention relates to the production of aluminum pigments, specifically for the composition of aluminum paste

The invention relates to the manufacture alumocobalt pigment and can be used in the paint industry for the manufacture of enamels with high heat resistance for coloring plastics, formed at high temperature, as well as for art and restoration works and paints for ceramics

The invention relates to the technology of artificial pearlescent pigment and can be used in the manufacture of paints and building cladding materials, plastic decorative panels, jewelry, cosmetics, glazes and other consumer goods with improved design

The invention relates to a method for producing pigments with mother-of-pearl luster based on mica flakes coated with metal oxides such as titanium and tin

The invention relates to chemical technology of inorganic substances, in particular to the technology of such products used in the leather industry, in the manufacture of plastics, paints, paper, etc

The invention relates to chemically-treated inorganic dyes - pigments suitable for use in thermoplastic resins

The invention relates to chemical technology of inorganic substances, in particular, to a technology of such products used in leather, paint industry, paper manufacturing, cosmetics and so on
The invention relates to the production of titanium dioxide, and in particular to methods of obeshlorivanie titanium dioxide obtained from the chlorine of raw materials
The invention relates to technologies for non-ferrous inorganic titanium pigment from ilmenite concentrates and can be used in paint, ceramic, construction, leather and paper industries
The invention relates to a method for obtaining pigment slurries with high solids content, more specifically to a method for pigment slurries of titanium dioxide with a high content of solid particles suitable for use in the manufacture of paper

The invention relates to the production of pigment from rutile titanium dioxide and is an improvement of the method of producing pigment from rutile titanium dioxide by oxidation of the halide of titanium compounds in the vapor phase in the presence of compounds containing eonmetall

FIELD: mining industry.

SUBSTANCE: perovskite concentrate, which can be used for manufacture of pigment titanium dioxide for paints, paper, enamels, and plastics, is processed as follows. 1 kg of concentrate is treated under atmosphere conditions with concentrated HCl at 90-100оС for 10 to 20 h to solubilize 75-85% of titanium, radioactive, and other acid-soluble components. Concentration of HCl is then lowered by diluting it with 1-5% HCl solution until TiO2 concentration 50-100 g/L. Thermohydrolysis of solution at 100-105оС accompanied by distilling away HCl leads to residual HCl concentration 20-100 g/L. Distilled HCl is sent to processing of perovskite concentrate. Titanium-containing precipitate is separated from mother liquor, washed first with 15-37% HCl solution and then with water to pH 3. Washed precipitate is treated with aluminum acid phosphate with pH 2-4. Aluminum acid phosphate uptake (on conversion to Al2O3) constitutes 0.5 to 5.0% content of TiO2. Treated precipitate is separated and calcined at 850-870оС to give pigment titanium dioxide. From mother liquor (after separation of Ti-containing precipitate), radioactive components are isolated by 4-6-step extraction with tributyl phosphate. Organic phase-to-water phase ratio is (1.5-2.0):1. Degree of titanium recovery is at least 98%, whiteness at least 96.5 conv. units, brightening power 1650-1800 conv. units, spreading capacity 38.0-40.0 g/m2, oil capacity 25-27 g/100 g pigment. Yield of pigment TiO2 is 95.7-98.0%. Amount of radioactive precipitate does not exceed 0.06 kg.

EFFECT: optimized perovskite concentrate processing parameters.

12 cl, 4 ex

FIELD: paint and varnish industry.

SUBSTANCE: invention proposes a flowing pigment mixture comprising titanium dioxide of universal sort or sort used in internal works with the concentration 40-100 vol.%, a thickening agent, dispersing agent and, optionally, water. The volume content of dry TiO2 is 15%, not less. As a thickening agent the mixture can comprise at least one hydrophobically modified ethyleneoxide-urethane polymer or at least one hydrophobically modified alkali-soluble emulsion, or at least one hydrophobically modified hydroxyalkylcellulose. As a dispersing agent the indicated mixture can comprise, for example, copolymers of maleic acid and diisobutylene, or butyl methacrylate and methacrylic acid, or acrylic acid and hydroxypropyl acrylate. Mixture can comprise additionally one or more additive taken among the following series: froth breaker, surface-active substance, coalescent agent, base, biocide, mildewcide agent, combined disperser, polymeric binding agent, a polymer with cellular latex particles. Proposed mixtures are stable and don't require a stirring. Invention can be used in preparing universal dyes and dyes for internal finishing.

EFFECT: improved preparing method, improved and valuable properties of mixtures.

20 cl, 13 tbl, 8 ex

FIELD: composite materials.

SUBSTANCE: invention concerns powderlike composite filler suitable for elastomer materials intended for manufacturing articles operated under elevated wear or dry friction conditions. Filler particles contain at least one core made from ceramic material (metal carbide) and exterior layer made from polytetrafluoroethylene, volume fraction of cores in filler particles ranging from 1 to 10%. Powderlike composite is prepared by activating metal carbide particles in mechanochemical activator at mechanical power supply intensity between 1 and 5 kW/kg and dose 30 to 1000 kJ/kg in a medium selected from: air, nitrogen, argon, vacuum between 10-2 and 1 atm until particles with average size not larger than 15 μm are obtained, after which polytetrafluoroethylene is added to mechanochemical activator and metal carbide particles are modified at mechanical power supply intensity between 0.05 and 0.5 kW/kg and dose 3 to 100 kJ/kg in a medium selected from: air, nitrogen, argon, vacuum between 10-2 and 1 atm.

EFFECT: addition of powderlike composite filler to rubber compound results in reduction in friction coefficient under dry friction conditions and significant reduction in summary friction pair wear under hydroabrasive wear conditions.

4 cl, 2 dwg, 3 tbl

FIELD: composite materials.

SUBSTANCE: invention relates to a process of manufacturing composite powder filler for elastomer compositions designed for fabrication of articles operated under increased wear and dry friction conditions. Process resides in that titanium carbide particles are activated in a mechanochemical activator with mechanical energy supply intensity 1 to 5 kW/kg and dose 100 to 1000 kJ/kg in a medium selected from a series: air, nitrogen, argon, and vacuum at pressure from 10-2 to 1 atm until particles with average size not larger than 15 μm are obtained, after which high-pressure polyethylene is added to activator and titanium carbide particles are modified at mechanical energy supply intensity 0,05 to 0.5 kW/kg and dose 3 to 100 kJ/kg in a medium selected from a series: air, nitrogen, argon, and vacuum at pressure from 10-2 to 1 atm.

EFFECT: lowered coefficient of friction under dry friction conditions and reduced summary rate of wear of friction pair under hydroabrasive wear conditions.

1 tbl

FIELD: chemical industry; public health; medicine; production of the titanium dioxide composition.

SUBSTANCE: the invention is pertaining to production of the titanium dioxide composition. The invention may be used in production of the sun-protective products providing the effective protection against UV-radiation and including titanium dioxide. The composition of the titanium dioxide contains at least one nonionic surface-active substance having the value of HLB(hydrophilic -lipophilic balance) within the interval from 7 up to 18, and the hydrophobic particles of the titanium dioxide, where the average length of the primary, particles is within the interval from 50 to 90 nanometers, the average width of the primary particles is within the range from 5 to 20 nanometers, and the average-volumetric diameter of the secondary particles makes less than 45 nanometers. The hydrophobic particles of the titanium dioxide have the absorption factor at 524 nanometers (Е524) - less than 2.0 l/g/cm, the absorption factor at 450 nanometers (Е450) - less than 3.0 l/g/cm, the absorption factor at 360 nanometers (Е360) - more than 3 l/g/cm, the absorption factor at 308 nanometers (Е308) - more than 30 l/g/cm, the maximum factor of the absorption (Еmax) - more than 45 l/g/cm and λ(max) - within the interval from 260 to 290 nanometers. The invention allows to improve the transparency of the sun-protective products containing the titanium dioxide.

EFFECT: the invention ensures the increased transparency of the sun-protective products containing the titanium dioxide.

24 cl, 4 ex

Up!