A method of obtaining a composite pigment, the pigment composite

 

(57) Abstract:

The invention relates to the chemical industry and can be used in the manufacture of dyes for inks, plates, ink and paper. Pigment composite contains a basis of titanium dioxide layers and oxides of zirconium and aluminum. Particles of TiO2dispersed in water, add a dispersant (sodium hexametaphosphate). The resulting suspension of titanium dioxide is heated to 46,11 to 50°C. Add a solution of H2SO4to maintain the pH from 7 to 9. Enter solution of zirconium sulfate. Precipitated 0.1 to 2.5% zirconium hydroxide by weight Tio2in terms of ZrO2. Add an aqueous solution Paon to maintain the pH from 7 to 9. Introducing an aqueous solution of sodium aluminate. Precipitated 3.5 to 4% aluminum hydroxide by weight Tio2in terms of Al2O3. The resulting product is filtered, washed with water and dried at 110°C. Shredded. Pigment composite has superior optical properties such as scattering, brightness, and color, and durability. 2 s and 5 C.p. f-crystals, 1 table.

The invention relates to a method for producing a pigment of a composite and the composite pigment.

Pigmentary titanium dioxide is widely used in kachestvennyij and paper. In most of these applications pigmentary titanium dioxide should be as good resistance and good optical properties.

A method of obtaining composite pigment containing a basis of titanium dioxide layers and oxides of zirconium and aluminum, comprising a dispersion of particles of titanium dioxide in water to form aqueous suspensions of titanium dioxide, coating, consisting practically of the water layer of zirconium dioxide by adding hydrolyzable water-soluble zirconium compounds to the above suspension and obtaining a precipitate of zirconium hydroxide on the basis of titanium dioxide, the formation thereon of a layer consisting practically of aluminum hydroxide and extracting the pigment component of the suspension.

Known composite pigment containing a basis of titanium dioxide layers and oxides of zirconium and aluminum, obtained by dispersion of particles of titanium dioxide in water to form aqueous suspensions of titanium dioxide, coating, consisting practically of a layer of Zirconia by adding hydrolyzable water-soluble zirconium compounds to the above suspension and obtaining a precipitate of zirconium hydroxide on the basis of the dioxide Deposit of suspension.

The present invention relates to a new composite pigment based on titanium dioxide, which shows how good durability. and excellent optical properties.

Therefore, the proposed composite pigment can be used in a wide range of applications, for example, as a dye in paint, plastics, ink and paper.

One object of the invention is a method of obtaining a pigment of a composite containing a basis of titanium dioxide layers and oxides of zirconium and aluminum, comprising a dispersion of particles of titanium dioxide in water to form a wave of suspensions of titanium dioxide, coating, consisting practically of the water layer of zirconium dioxide by adding hydrolyzable water-soluble zirconium compounds to the above suspension and obtaining a precipitate of zirconium hydroxide on the basis of titanium dioxide, the formation thereon of a layer consisting almost their aluminum hydroxide, and removing the composite pigment of the suspension, characterized in that the application of these coatings is carried out at a pH from about 7 to about 9 and a temperature of from about 46,11oC to about 50oC, and a layer of aluminum hydroxide form by debalanced aluminum.

Another object of the invention is a composite pigment containing a basis of titanium dioxide layers and oxides of zirconium and aluminum, obtained by dispersion of particles of titanium dioxide in water to form aqueous suspensions of titanium dioxide, coating, consisting practically of the water layer of zirconium dioxide by adding hydrolyzable water-soluble zirconium compounds to the above suspension and obtaining a precipitate of zirconium hydroxide on the basis of titanium dioxide, the formation thereon of a layer consisting practically of aluminum hydroxide, and removing the composite pigment in the slurry, characterized in that he obtained applying these coatings at a pH of from about 7 to about 9 and a temperature of from about 46,11oC to about 50oC, and a layer of aluminum hydroxide formed by adding to the suspension hydrolyzable water-soluble aluminum compounds with obtaining a precipitate of aluminum hydroxide.

The base material of titanium dioxide in the form of particles used in the present invention, preferably is titanium dioxide of the rutile type, obtained either well known chloride method, or a well-known sulfating, giving alumina, commonly used methods for producing titanium dioxide in order to achieve improved product durability and utilizacii.

The base material of titanium dioxide in the form of particles used in the present invention has a particle size of less than about 0.5 microns. The basis of titanium dioxide in the form of particles most preferably has a particle size in the range of about 0.2 to 0.25 microns.

The layer of zirconium hydroxide proposed composite pigment precipitated on the base material of titanium dioxide in a quantity sufficient to improve the stability of the proposed composite pigment. The layer of zirconium hydroxide is preferably precipitated on the basis of titanium dioxide in a quantity, expressed as ZrO2in the range of about 0.1 - 2.5 wt.% in the calculation of the mass base of titanium dioxide. The resistance of the proposed composite pigment is usually not too improves when on the basis of titanium dioxide precipitated a smaller amount of zirconium hydroxide. However, the precipitation of zirconium hydroxide on the base material of titanium dioxide in excess of 2.5 wt. % affects the optical properties of the pigment composite.

As described above, a layer of aluminum hydroxide proposed composite pigment consists essentially of boehmite, pseudoboehmite or combinations thereof. When you use here and in the claims, the term "consisting essentially of" is used to exclude the presence of additional links (i.e., additional layers of the composite, additional operations in the way, or quantities of additional compounds), which could significantly change the resistance and/or optical properties of the proposed composite pigment.

A layer of aluminum hydroxide are used to improve the optical properties of the proposed composite. In this regard, we note that the optical properties to be achieved by the use of boehmite and/or pseudoboehmite, superior optical properties obtained by the use of gibbsite or amorphous aluminum oxide. A layer of aluminum hydroxide proposed compo is

A layer of aluminum hydroxide proposed composite precipitated on the layer of zirconium hydroxide composite in an amount sufficient to improve the optical properties of the proposed composite pigment. A layer of aluminum hydroxide is preferably precipitated on the layer of zirconium hydroxide in a quantity, expressed Al2O3in the range of about 3 to 5 wt.% based on the weight of the base material of titanium dioxide. More preferably, the layer of aluminum hydroxide precipitated on the layer of zirconium dioxide in a quantity, expressed as Al2O3in the range of about 3.5 to 4.0 wt.% based on the weight of the base material of titanium dioxide. Most preferably, the layer of aluminum hydroxide precipitated on the layer of zirconium hydroxide in a quantity, expressed as Al2O3about 3.7 wt.% based on the weight of the base material of titanium dioxide.

The proposed composite pigment receive, first of all, the dispersion of the base material of titanium dioxide in the form of particles in the water for the formation of aqueous suspensions of titanium dioxide. The amount of titanium dioxide used in the preparation of the suspension, is preferably such an amount that the suspension had a specific weight range is about is not necessary to use a dispersant, as sodium hexametaphosphate. When using the sodium hexametaphosphate is preferably added to the aqueous suspension in an amount in the range of approximately 0.05 - 0.25 wt.% in the calculation of the mass base of titanium dioxide. More preferably, the sodium hexametaphosphate is added to the suspension in an amount in the range of about 0.1 to 0.14 wt.% in the calculation of the mass base of titanium dioxide.

If desirable or necessary, the base material of titanium dioxide can be added to at least part of the environment water suspension and then finely crushed (for example, using a sand mill to reduce the particle size of the base material of titanium dioxide. After grinding, the suspension is sieved through a sieve to remove small solid particles (grit) and sand.

After preparation, the pH of the suspension of titanium dioxide is preferably adjust to values in the range of about 4-6 using, as appropriate, either acidic pH controlling agent, or basic pH controlling agent. the pH of the suspension of titanium dioxide is preferably adjust to values in the range of about 4,7 - 5,3. Examples of acidic pH controlling agents suitable for use in the present image is impactfully acidic pH controlling agent for use in the present invention. Examples of basic pH controlling agents suitable for use in the present invention include hydroxide and carbonates of alkali and alkaline earth metals. Sodium hydroxide is the preferred basic pH controlling agent for use in the present invention.

After adjusting the pH of the suspension of titanium dioxide just as described on the base material of titanium dioxide precipitated layer of precipitate of zirconium hydroxide. The layer of zirconium hydroxide precipitated on the basis of titanium dioxide by (1) adding at least one water-soluble zirconium compounds (preferably acidic zirconium salt) to a suspension of titanium dioxide, which is hydrolyzable to form a precipitate of zirconium hydroxide, (2) adding to the suspension of titanium dioxide sufficient basic pH controlling agent, to cause a precipitate of zirconium hydroxide and then (3) assumptions deposition on the base material of titanium dioxide precipitate of zirconium hydroxide. At stage (2) this process of deposition of zirconium pH of a suspension of titanium dioxide is preferably adjust to values in the range of about 7 to 9. Then preferably maintain the pH of the suspension SIU titanium dioxide is also preferably stirred or shaken during the process of deposition of zirconium. In addition, the stage (3) of the deposition of zirconium is preferably continued for a period of time (usually at least about 15 minutes), enough so that essentially all of zirconium added to a suspension of titanium dioxide was deposited on the base material of titanium dioxide.

As described above, the connection of zirconium used in the proposed method, is preferably water-soluble acid salt of zirconium. Preferably a water-soluble compound of zirconium is added to a suspension of titanium dioxide in aqueous solution. Examples of zirconium compounds suitable for use in the proposed method, include zirconium sulfate, zirconium chloride, zirconium nitrate, zirconium acetate, zirconium carbonate, zirconium oxychloride, oxysulfate zirconium and ammonium zirconium carbonate. Water-soluble compounds of zirconium, preferred for use in the proposed method, is the sulfate of zirconium.

During the process of deposition of Zirconia suspension of titanium dioxide is also preferably supported at an elevated temperature not exceeding about 130oF (54,44oC). The use of higher temperature is used to accelerate the process on the P>F (54,44oC) would adversely affect the resistance of the composite pigment of titanium dioxide. Most preferably, the suspension of the titanium dioxide support in the range of about 115-122oF (46,11-50,0oC) during the process of deposition of zirconium.

Water-soluble compound of zirconium used in the present invention, is added to a suspension of titanium dioxide in an amount such that the during the process of deposition of Zirconia on the base material of titanium dioxide was deposited a sufficient amount of the precipitate of zirconium hydroxide to improve the stability of the proposed composite pigment. Preferably a water-soluble compound of zirconium is added to a suspension of titanium dioxide in an amount such that the precipitate of zirconium hydroxide was deposited on the basis of titanium dioxide in a quantity, expressed as ZrO2in the range of about 0.1 - 2.5 wt.% based on the weight of evidence from titanium dioxide. More preferably, the compound of zirconium is added to a suspension of titanium dioxide in an amount such that the precipitate of zirconium hydroxide was deposited on the basis of titanium dioxide in a quantity, expressed as ZrO2in the range of about 0.4 - 0.6 wt.% in calculating the masses of the base on the quantity to precipitate zirconium hydroxide was deposited on the basis of titanium dioxide in a quantity, expressed as ZrO2about 0.5 wt.% based on the weight of titanium dioxide.

After essentially all of zirconium added to suspensions of titanium dioxide, fell out of solution and deposited on the material bases of titanium dioxide, the pH of the suspension of the titanium dioxide support, or, if necessary, adjust to values in the range of about 7 to 9. During this stage the pH of the suspension of titanium dioxide is most preferable support, or adjust to, the values in the range of about 7.5 to 8.5.

Then precipitated layer of aluminum hydroxide on the above layer precipitate of zirconium hydroxide. A layer of aluminum hydroxide preferably consists essentially of boehmite, pseudoboehmite and/or combinations thereof. The precipitate layer of aluminum hydroxide precipitated on the layer of zirconium hydroxide by (1) adding a water-soluble aluminum compounds to the suspension of titanium dioxide, which is hydrolyzable to form a precipitate of aluminum hydroxide and (2) assumptions sedimentation hydroxide of aluminum on the layer of zirconium hydroxide. At stages (1) and (2) of the deposition of aluminum oxide suspension of titanium dioxide is about continue until while essentially all aluminum added to a suspension of titanium dioxide comes out of solution and are deposited on the base material of titanium dioxide.

Examples of water-soluble aluminum compounds suitable for use in the proposed method, include aluminum salts of mineral acids (e.g., aluminum sulfate, aluminum nitrate and aluminum chloride) and aluminates of alkali metals (e.g. sodium aluminate). Water-insoluble compound of aluminum, are preferred for use in the proposed method, is sodium aluminate.

Preferably a water-soluble compound of aluminum used in the present invention is added to a suspension of titanium dioxide in aqueous solution.

During the process of deposition of aluminum oxide pH and temperature of the suspension of the titanium dioxide support so that the precipitate of aluminum hydroxide precipitated on the basis of titanium dioxide, consisted essentially of boehmite and/or pseudoboehmite. If the temperature of the suspension of the titanium dioxide support at 104oF (40,0oC), for example, the pH of the suspension must be maintained in the range of 8-10 in order to ensure that the precipitate of aluminum oxide consists essentially of b the other hand, the pH of the slurry must be maintained in the range of 6-10 in order to ensure that the precipitate of aluminum oxide consists essentially of boehmite and/or pseudoboehmite. If the pH of a suspension of titanium dioxide exceeds 10 during the process of deposition of aluminum oxide, the precipitate of aluminum hydroxide will consist of gibbsite. If you use a lower temperature and pH, it will form a precipitate of amorphous aluminum oxide.

During the stage and adding aluminum compounds, and the stage of deposition of the aluminum oxide deposition process of aluminum oxide, the suspension of titanium dioxide is preferably supported at a pH in the range of about 7 to 9 and at a temperature in the range of about 115-122oF (46,11 - 50,0oC). Most preferably, the suspension of the titanium dioxide support at a pH in the range of about 7.5 - 8.5 in the course of the deposition of aluminum oxide.

Water-soluble compound of aluminium, used in the proposed method, add to the suspension of titanium dioxide in such quantity to precipitate the precipitate of aluminum hydroxide on the above layer of zirconium hydroxide in a quantity sufficient to improve the optical properties of the proposed composite pigment. It is preferable to suspension hydroxide of aluminum on the layer of zirconium hydroxide in a quantity expressed as Al2O3in the range of about 3 to 5 wt.% based on the weight of the base material of titanium dioxide. More preferably to a suspension of titanium dioxide add sufficient amount of water-soluble aluminum compounds to precipitate precipitate of aluminum hydroxide on the layer of zirconium hydroxide in a quantity, expressed as Al2O3in the range of about 3.5 to 4.0 wt. % (based on the weight of the base material of titanium dioxide. Most preferably, the suspension of titanium dioxide is added a sufficient amount of aluminum compounds to precipitate precipitate of aluminum hydroxide on the layer of zirconium oxide in a quantity, expressed as Al2O3about 3.7 wt.% in the calculation of the mass base of titanium dioxide.

After completion of the deposition of aluminum oxide in the pH of the suspension of titanium dioxide is preferably reduced to a final value of about 5, using acidic pH controlling agent of the above type. The lower end pH of a suspension of titanium dioxide in this way leads to the fact that the proposed product flatwire to a greater extent and thereby improves the machinability of the product.

New pigment composica, the floor of the Oia, washing and drying. The proposed composite pigment is preferably washed in water and dried at a temperature of about 110oC. the Dried product is preferably crushed (for example, in the jet mill) before use.

The following examples are presented to further illustrate the present invention.

Example. Titanium dioxide in the form of particles of rutile (specified in the remainder of this example as the basis of titanium dioxide) was dispersively water education water suspension having a density of 1.4 grams per milliliter. To facilitate dispersion of the base of titanium dioxide in water to the suspension was added dispersant (e.g., sodium hexametaphosphate) in an amount of 0.12 wt.% in the calculation of the mass base of titanium dioxide.

Suspension of titanium dioxide was ground in a sand mill for eight minutes using sand size 1040 mesh. After sand grinding suspension was passed through 325 mesh. sieve to remove sand particles from the suspension. Then the suspension of titanium dioxide was further diluted with water to dilute the slurry has a concentration of titanium dioxide 850 grams per liter. The density of diluted sugahara initial pH of the suspension was 9.9.

Then 2,500 ml suspension of titanium dioxide were placed in a heated vessel with stirring, in which the temperature of the suspension was raised to 117oF (47,22oC). To the suspension was added a sufficient amount of an aqueous solution of sulfuric acid to reduce the pH of the suspension to a value of about 5. An aqueous solution of sulfuric acid has a concentration of sulfuric acid 92 wt.%.

Then, to the suspension of titanium dioxide was added 23 ml of an aqueous solution of zirconium sulfate. A solution of zirconium sulfate has a concentration of zirconium sulfate (expressed as ZrO2) 200 grams per liter.

After adding an aqueous solution of zirconium sulfate in the pH of the suspension is raised to a value of about 8 using aqueous sodium hydroxide solution. An aqueous solution of sodium hydroxide has a concentration of NaOH 20 wt.%.

Then the suspension of titanium dioxide was cooked in a heated vessel with stirring for 15 minutes. During this stage cooking essentially all of zirconium added to suspensions of titanium dioxide, precipitated out of solution and formed a layer of zirconium hydroxide on the base material of titanium dioxide in the form of particles. The amount of zirconium hydroxide deposited on the base material of the dio titanium.

After the stage of digestion of zirconium to a suspension of titanium dioxide was added an additional amount of 20 wt.% NaOH solution to maintain the pH of the suspension of titanium dioxide in the value of about 8.

Then, to the suspension of titanium dioxide was added to 120 ml of an aqueous solution of sodium aluminate. Aqueous sodium aluminate solution has a concentration of sodium aluminate (expressed as Al2O3) 280 grams per liter. During the stage of adding sodium aluminate to the suspension of titanium dioxide was added a sufficient amount of the above 94% sulfuric acid to maintain the pH of the suspension in the range of 7.5 - 8.5. Immediately after the stage of adding sodium aluminate to the suspension of titanium dioxide was added a sufficient amount of 92 wt.% solution of sulfuric acid to adjust the pH of the suspension of titanium dioxide to a value of about 8.

After just described the stages of adding sodium aluminate and adjusting the pH of the slurry of titanium dioxide was cooked in a heated vessel with stirring during those hours. During this three-hour cooking period essentially all aluminum added to a suspension of titanium dioxide, precipitated out of solution and formed a layer of hydroxide is the hydroxide of zirconium, total of 4.0 wt.% (expressed as Al2O3in the calculation of the mass of the base material of titanium dioxide.

During the stages of adding sodium aluminate and boiling suspension of titanium dioxide maintained at a temperature of 117oF (47,22oC).

After the stage of absorption of sodium aluminate composite pigment of titanium dioxide was extracted from suspensions of titanium dioxide by filtration. Then the composite was washed with water and dried at 110oC. prior To the test composite was ground in a jet mill.

We offer pigment composite was tested to evaluate its optical properties and durability. The purpose of the comparison was also evaluated using the same procedure, known composite titanium dioxide grades for enamel having excellent optical properties (CR-800, produced by Kerr-Jacques guy chemical Bldg. and known composite titanium dioxide grade intermediate resistance (CR-82) produced Kerr-Jacques guy chemical Corp.). The results of these tests are presented in the table (see the table at the end of the description).

As shown in the table, the proposed composite pigment showed optical properties superior to the properties of the composite grade for the enamel. In chestnut relevant optical properties of the composite grade for enamel.

We offer pigment composite also showed good durability. As shown, the values of VOFKA (photocatalytic activity high sensitivity) three pigment composites, durability, manifested proposed composite pigment, was roughly equivalent to the resistance shown by the known composite varieties of intermediate resistance. In addition, the resistance of the proposed composite pigment was much higher than the resistance of the composite grade for enamel.

Thus, the present invention is well adapted to accomplish the goals and achieve the results and advantages, as mentioned above, and are inherent in the invention itself. Despite the fact that specialists can be made numerous changes similar to the changes made in the scope of the invention defined by the attached claims.

1. A method of obtaining a pigment of a composite containing a basis of titanium dioxide layers and oxides of zirconium and aluminum, comprising a dispersion of particles of titanium dioxide in water to form aqueous suspensions of titanium dioxide, coating, consisting practically of a layer of zirconium hydroxide by adding hydrolyzable ve of titanium dioxide, education on it a layer consisting practically of aluminum hydroxide, and removing the composite pigment in the slurry, characterized in that the application of these coatings is carried out at a pH from about 7 to about 9 and a temperature of from about 46,11oC to about 50oC, and a layer of aluminum hydroxide is formed by adding to the suspension hydrolyzable water-soluble aluminum compounds with obtaining a precipitate of aluminum hydroxide.

2. Pigment composite containing a basis of titanium dioxide layers and oxides of zirconium and aluminum, obtained by dispersion of particles of titanium dioxide in water to form aqueous suspensions of titanium dioxide, coating, consisting practically of a layer of zirconium hydroxide by adding hydrolyzable water-soluble zirconium compounds to the above suspension and obtaining a precipitate of zirconium hydroxide on the basis of titanium dioxide, the formation thereon of a layer consisting practically of aluminum hydroxide, and removing the composite pigment in the slurry, characterized in that he obtained applying these coatings at pH from about 7 to about 9 and a temperature of from about 46,11oC to about 50oC, and the layer of the organisations aluminum with obtaining a precipitate of aluminum hydroxide.

3. Pigment composite under item 2, characterized in that it contains a layer of aluminum hydroxide in a quantity sufficient to improve the optical properties of the specified composite pigment.

4. Pigment composite under item 3, characterized in that it contains a basis of titanium dioxide of the rutile type.

5. Pigment composite under item 4, characterized in that it contains a layer of zirconium hydroxide in an amount of from about 0.1% to about 2.5% by weight of titanium dioxide calculated on ZrO2.

6. Pigment composite under item 5, characterized in that it contains a layer of aluminum hydroxide in an amount of from about 3.5% to about 4% by weight of titanium dioxide calculated on Al2O3.

7. Pigment composite under item 5, characterized in that it contains a layer of zirconium hydroxide in an amount of from about 0.4% to about 0.5% by weight of titanium dioxide calculated on ZrO2.

 

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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

FIELD: varnish-and-paint industry.

SUBSTANCE: process of producing titanium dioxide pigment according to chloride technology comprises oxidation of titanium tetrachloride with oxygen or oxygen-containing gas in plasmachemical reactor followed by cooling of reaction products in tempering chamber and subsequent multistep fine grinding of intermediate product, titanium dioxide, by way of affection with supersonic gas flow at 100-500°C and ratio of gas mass intake to titanium dioxide mass intake = 0.2. In the first step of titanium dioxide fine grinding, treatment of titanium dioxide is performed with a dry gas supplemented by vapor of organic or organosilicon modifier having in its molecule at least one of the following functional groups: -OH, -NH2, NH, SH at mass intake of modifier representing 0.1-2.0% of the mass intake of titanium dioxide.

EFFECT: improved quality of titanium dioxide pigment and simplified process of production thereof.

1 dwg, 1 tbl

FIELD: methods and plants for increase of volume density of aerated powders.

SUBSTANCE: proposed method of compacting the powder containing oxide or phosphate of metal consists in placing the powder in container and increasing the pressure in its area above atmospheric pressure sufficient for compacting the powder before diffusion of considerable part of gas into powder. Powder containing oxide or phosphate of metal is placed in container and its volume density is increased. Then, concentrated suspension of pigment which is titanium dioxide is prepared. Specification gives description of plant proposed for increase of volume density of powder containing oxide or phosphate of metal and plant for increase of volume density of aerated loose pigment which is just titanium dioxide.

EFFECT: increased volume density of aerated powder; improved consistency; facilitated dispersion in latex paints.

22 cl, 6 dwg, 3 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention can be applied in production of rutile-structured pigment based on titanium dioxide. The method of obtaining the base for pigment rutile titanium dioxide involves obtaining of source solution containing a titanium compound, addition of effective quantity of a salt catalyst to that solution, preferable addition of a chemical control agent to the solution, solution evaporation for obtaining dry amorphous intermediary product containing a mixture of titanium compounds, and baking of the intermediary product at the temperature under 500°C. Another variant of the method of obtaining the base for pigment rutile titanium dioxide uses eutectic mix of two or more NaCl, KCl and LiCl salts as the salt catalyst, melting temperature of the salt catalyst being lower than baking temperature.

EFFECT: reduction of rutile crystallisation temperature.

42 cl, 12 ex, 19 dwg

FIELD: chemistry.

SUBSTANCE: invention can be used in lacquer-paint industry, in production of plastics, paper and other branches. Method of superficial procession of pigment titanium dioxide includes dechlorisation of titanium dioxide, wet milling and hydro-classification of titanium dioxide suspension, superficial procession of titanium dioxide, filtration, washing of titanium dioxide paste, its procession with organic compound, drying and microgrinding. Dechlorisation process is carried out at temperature of 50-60°C by combined dispersion of titanium dioxide in water and reduction of admixture chlorine in TiO2 with sodium hypophosphite in the amount twice exceeding content of chlorine in titanium dioxide, with further neutralisation of suspension with solution of sodium silicate to pH 6.5-7.0 and filtration. Suspension stabilisation before hydro-classification is carried out with solution of sodium silicate to pH of suspension 9.0-9.5 at temperature of 50-60°C. Superficial procession of fine fraction of suspension TiO2 is carried out at temperature of 60-70°C with compounds of titanium and aluminium using 1.0% weight TiO2 from solution of titanium tetrachloride, 2.5% weight Al2O3 from solution of sodium aluminate and 1.2-1.5% weight Al2O3 from solution of aluminium chloride. Processed suspension is filtered; paste is repulped in water to remove water-soluble substances; suspension is filtered. Prior to drying TiO2 paste is processed with organic compounds in The form of alkyl dioxyethylene in amount of 0.3-0.6% weight to TiO2, dried and microground.

EFFECT: increased indices of titanium dioxide, such as output of fine fraction of suspension TiO2 on hydro-classification, reduction of content of water-soluble substances in pigment, improvement of dispersibility in organic binders and gloss in akril paint and an increase in atmosphere-resistance.

2 cl, 5 ex, 3 tbl

FIELD: chemistry.

SUBSTANCE: modification of titanium dioxide by metal oxides involves titanium dioxide treatment in water suspension by solutions of magnesium, or aluminium, or nickel formiates obtained by reaction of aqueous formic acid solution with the indicated metals or their carbonates or hydroxides. Formic acid quantity is stechiometric or exceeds stechiometric quantity by 20-100%. Further the suspension is dried in dispersion dryer with heating of titanium dioxide with applied salts at 200-700°C for 1-60 minutes.

EFFECT: reduced temperature of titanium dioxide modification without surface contamination with hardly removable anions, or anatase form transmutation into rutile form.

2 cl, 9 ex

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