Particle of titanium dioxide pigment with dense doped layer of silicon dioxide (sio2) (versions), method of making particles with dense doped layer of sio2 (versions) and method of producing paints, lacquers and paper using said particles and starting material when making paper or coating based on said particles

FIELD: chemistry.

SUBSTANCE: dense layer of silicon dioxide is deposited on the surface of titanium dioxide particles from a gas phase, said silicon dioxide layer being doped with at least one doping element selected from a group which includes Sn, Sb, In, Y, Zn, F, Mn, Cu, Mo, Cd, Ce, W and Bi or mixtures thereof. A dense layer of silicon dioxide can be deposited on the surface of titanium dioxide from a liquid phase, said silicon dioxide layer being doped with at least one doping element selected from a group which includes Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi or mixtures thereof.

EFFECT: invention increases photostability of titanium dioxide pigment particles.

27 cl, 18 dwg

 

The technical field to which the invention relates.

Group of inventions relates to pigment particles of titanium dioxide, the surface of which is covered with a dense layer of silicon dioxide doped with one of the alloying elements, as well as the way they are received. The pigment particles of titanium dioxide of the present invention are characterized by improved photostability.

The level of technology

Titanium dioxide due to its high index of refraction of light is a valuable pigment in various industries, for example, used in the manufacture of plastics, coatings, paper and fibers.

However, titanium dioxide is photoactive, for example, due to the absorption of UV light, there are some unwanted photocatalytic reactions, which lead to the decomposition of the pigment materials (H.G. Volz, G. Kaempf, H.G. Fitzky, A. Klaeren "The Chemical Nature Chalking in the Presence of Titanium Dioxide Pigments", ACS Symp. Ser., 1981, 151, Photodegradation and Photostabilization of Coatings). While the pigments of titanium dioxide absorb light in the near UV region, and is formed of a pair of electron-vacant orbital (e), which leads to the formation of radicals with high reactivity on the surface of titanium dioxide. Such radicals in organic environment induce decomposition of the binders. Experimental evidence suggests that ions guide is oxyl play an important role in the photocatalytic process (C.S.Turchi, D.F.Ollis "Photocatalytic Degradation of Organic Water Contaminants: Mechanism Involving Hydroxyl Radical Attack", Journal of Catalysis, 1990, 122:178-92).

It is known that photoactivity TiO2can be reduced by alloying particles of TiO2(for example, aluminum) or a surface treatment of the inorganic compound (for example, applying a layer of silicon oxide and/or aluminum or zirconium) (Industrial Inorganic Pigments, ed. G.Buxbaum, VCH, New York, 1993, pp.58-60). First of all, many of the patents described the application as possible dense, amorphous coating of SiO2on the surface of the particles, the so - called "thick film". These films have a density that bind free radicals on the surface of the particles.

Liquid-phase chemical methods of obtaining a dense layer of SiO2a subsequent application of a layer of Al2O3inorganic particles, primarily TiO2, is described in U.S. patent No. 2885366, RE 27818 and 4125412. In the patent EP 0245984 B1 describes a method of simultaneously adding solutions containing Na2SiO3and In2About3at low temperatures from 65 to 90C.

Dense layers of SiO2also used to increase the strength covered with such layers of optical fibers, to improve their resistance to abrasion and to reduce resistance to the adhesion of the fibers in the finished products. In this regard, in U.S. patent No. 2913419 describes the chemical method in the liquid phase for Coosada the Oia on the surface of the particles of silicic acid and ions of polyvalent metals, such as Cu, Ag, Ba, Mg, Be, Ca, Sr, Zn, Cd, Al, Ti, Zr, Sn, Pb, Cr, Mn, Co, Ni.

In the patent application U.S. No. 2006/0032402 A1 describes improving the photostability of pigments of TiO2covered by a dense layer, which is obtained by adding Sn, Ti or Zr in the formed layer of SiO2liquid-phase chemical method.

In addition to the known liquid-phase chemical methods for coating the surface of particles of TiO2known methods of applying a thick layer of SiO2from the gas phase. In this case, in the process of producing titanium oxide chloride by the method of a silicon compound, preferably SiCl4add to the stream of particles TiO2heated to temperatures above 1000C, you get a uniform dense layer of SiO2on the surface of the particles.

In European patent publication EP 1042408 described a method of coating from the gas phase to the surface with the use of oxides of Si, b, P, Mg, Nb, or Ge.

Disclosure of inventions

The present invention is the development of pigment particles of titanium dioxide coated with a thick layer of SiO2that exhibit superior photostability compared with the known pigment particles with a dense coating. The invention relates to a method for producing such pigments.

The objective of the invention is solved by obtaining the pigment particles of titanium dioxide, surface the activities that are covered with dense SiO 2-layer from the gas phase and containing at least one alloying element, and the specified SiO2the layer is characterized by the fact that when the doping of at least one alloying element density of the energy levels in the valence band and/or in the conduction band near the forbidden zone is reduced or create additional energy levels in the forbidden zone, and alloying elements are different from elements selected from the group comprising Al, In, Ge, Mg, Nb, P, and Zr.

The objective of the invention is also solved by issuance of pigment particles of titanium dioxide on the surface which are covered with dense SiO2layer from the gas phase, doped, at least one alloying element chosen from the group comprising Sn, Sb, In, Y, Zn, F, Mn, Cu, Mo, Cd, Ce, W and Bi, or a mixture thereof.

The objective of the invention is also solved by issuance of pigment particles of titanium dioxide on the surface which are covered with dense SiO2layer, the obtained liquid-phase chemical method and alloyed at least one alloying element; specified SiO2the layer is characterized by the fact that when the doping at least one alloying element density Energeticheskiy levels in the valence band and/or the conduction band near the forbidden zone is reduced or create additional energy levels in Zap is esenkoy zone, and alloying elements are different from elements selected from the group comprising Ag, Al, B, BA, Be, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Sn, Sr, Ti, Zn and Zr.

The objective of the invention is also solved by obtaining the pigment particles of titanium dioxide on the surface which are covered with dense SiO2layer, the obtained liquid-phase chemical method and alloyed at least one alloying element chosen from the group comprising Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi, or a mixture thereof.

The objective of the invention is also solved using the method of producing the pigment particles of titanium dioxide on the surface of which is applied a thick SiO2-layer doped at least one alloying element, and the method includes the following stages:

a) translation of titanium chloride in the gas phase in the presence of aluminum halide and a gas containing oxygen in a reactor at a temperature above 1000C, the resulting gas is sent to the stream of particles containing TiO2,

b) contacting the stream of particles, at least two connections, the first connection is a connection-the precursor of silicon oxide, and the second compound is chosen from the group comprising compounds, the precursors of oxides of Sn, Sb, In, Y, Zn, Mn, Cu, Mo, Cd, Ce, W and Bi and connections precursor F or their mixture,

C) cooling the stream of particles produces the t of the pigment particles, on the surface which are covered with dense SiO2-layer doped at least one alloying element chosen from the group comprising Sn, Sb, In, Y, Zn, F, Mn, Cu, Mo, Cd, Ce, W and Bi, or a mixture thereof.

And, finally, the object of the invention is solved by a method of obtaining pigment particles of titanium dioxide on the surface of which is applied a thick SiO2-layer doped at least one alloying element, and the method includes the following stages:

a) obtaining a water suspension of particles of TiO2at pH about 10,

b) adding an aqueous solution of an alkaline component of silicon and at least one aqueous component containing the alloying element chosen from the group comprising Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi, or a mixture thereof,

C) deposition of dense SiO2layer doped with at least one alloying element, on the surface of the particles by reducing the pH of the slurry to less than 9, preferably less than 8, and the alloying element selected from the group including Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi, or a mixture.

Other preferred embodiments of the invention are presented in the claims.

The object of the present invention are pigments of titanium dioxide coated, which are characterized by improved photostability.

Brief description of drawings

<> Figure 1 shows the energy levels in the transition from the atomic state in the solid (see Rash, "The Electronic Structure and Chemistry of Solids", Oxford Science Publication, 1987, p.13).

Figure 2 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and without it.

Figure 3 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Sn.

Figure 4 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Sb.

Figure 5 shows the densities of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed In.

Figure 6 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Ge.

7 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Y.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Nb.

Figure 9 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed F.

Figure 10 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO , alloyed Mn.

Figure 11 shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Cu.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Mo.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Cd.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed CE.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed W.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Bi.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Mg.

On Fig shows the density of the energy levels of the surface of TiO2with a layer of SiO2and with a layer of SiO2, alloyed Al.

The implementation of the invention

The pigments according to the present invention contain in the dense layer (thick film) on the surface of particles of titanium dioxide from 0.1 to 6.0 wt.%, preferably from 0.2 to 4.0 wt.% silicon in the form of SiO 2and from 0.01 to 3.0 wt.%, preferably from 0.05 to 2.0 wt.% alloying element oxide, or, in the case of F as an element, calculated on the total weight of the pigment.

In a preferred embodiment of the invention the particle cover additional layer of aluminum oxide in an amount of from 0.5 to 6.0 wt.%, preferably from 1.0 to 4.0 wt.% or hydrate of aluminum oxide in the form of Al2O3calculated on the total weight of the pigment. Preferably as particles of titanium dioxide using rutile.

In this context, the term "alloying element" means the corresponding element in the form of an atom or ion, and the corresponding connection, for example, oxide. In this description of the obtained liquid-phase chemical method layer means "oxide", including appropriate water-containing oxide or the corresponding hydrate. All contained in the description data, such as pH, temperature, concentration in wt.% or.%, identified with well-known specialists precision.

The essence of the present invention is to improve the photostability photocatalytic process appropriately suppress, that is impeded by the formation of radicals with high reactivity in the formation of a pair of uh. This phenomenon can be explained by various mechanisms, for example, increasing the speed of the river is Binali pair e-IN or the formation of an energy barrier on the surface of the pigment.

Dense and uniform (the surface) layer of SiO2already forms an energy barrier on the surface of TiO2that reveal at a reduced density of the energy levels near the forbidden region of the valence band and the conduction band on the surface of TiO2coated in comparison with the surface of TiO2without coverage. Unexpectedly, it was found that the doping of the layer of SiO2a certain element in a greater degree reduces the density of the energy levels near the forbidden band, thereby increasing the energy barrier and largely improves the photostability of the specified pigment of TiO2with the floor. Additional energy levels within the forbidden region between the valence band and the conduction band accelerates the recombination of pairs e. Doping the layer of SiO2a certain element also causes the formation of a specified energy level and improves the photostability compared to undoped layer of SiO2.

Suitable alloying element selected from the group comprising Sn, Sb, In, Ge, Y, Zr, Zn, Nb, F, Mn, Cu, Mo, Cd, Ce, W and Bi. Doped SiO2the liquid-phase layer is applied by a chemical method or a gas phase. It is known that the method of deposition from the gas phase is used for the deposition of uniform layers, as well as Yesenia liquid-phase chemical method.

The invention relates also to the doping dense layers of SiO2other alloying elements, for which the density of the energy levels is not yet known, but they do in a simple way, as described below. In the scope of the invention includes all of the alloying elements, which provide the energy levels according to the invention in a doped layer of SiO2and that had not been defined in the course of chemical experiments. Known alloying elements, which are not included in the invention and which is used for dry deposition from the gas phase, are Al, In, Ge, Mg, Nb, P, and Zr, and for application of liquid-phase chemical method - Ag, Al, B, BA, Be, Ca, Cd, Co, Cr, Cu, Mg, Mn, Ni, Nb, Sn, Sr, Ti, Zn and Zr.

Moreover, you can find suitable combinations of two or more alloying elements using the total density of energy levels, which are judged by the interaction of the energy levels of each individual element. Such preferred combinations can be selected simply by using the calculation method according to the invention compared with the known prior art is long and expensive chemical experiments.

The density of the energy levels calculated by the method of quantum mechanics using the CASTEP software (version 4.6, 1 iuna) company Accelrys Inc., San Diego. Calculations carried out using the algorithm of the "density function" CASTEP using local density approximation. Detailed description of the method presented in the article V.Milman et al., International Journal of Quant. Chemistry, 2000, 77: 895-910. For titanium used the following valence levels, including sub-levels: 3s, 3P, 3d, 4s and 4P. For oxygen used the following valence levels: 2s and 2P, and for silicon: 3s and 3P. For alloying elements indium, yttrium and magnesium used sublevels 4d or 4s and 4P or 2P. For the rest of the alloying elements used the following valence levels:

Sn: 5s, 5p, 6s, 6p, 7s;

Sb: 5s, 5p, 6s, 6p, 7s;

In: 4d, 5s, 5p, 6s, 6p, 7s;

Ge: 4s, 4P, 4d;

Y: 4s, 4P, 4d, 5s, 5p;

Nb: 4s, 4P, 4d, 5s, 5p;

F: 2s, 2p;

Mn: 3d, 4s, 4P;

Cu: 3d, 4s, 4P;

Mo: 4s, 4P, 4d, 5s, 5p;

Cd: 4d, 5s, 5p, 6s, 6p;

Ce: 4f, 5s, 5p, 6s, 6p, 7s, 7p, 8s;

W: 5d, 6s, 6p;

Bi: 6s, 6p, 7s, 7p, 8s;

Mg: 2p, 3s, 3p;

Al: 3s, 3p.

The value of the cut-off kinetic energy for the above values is 380 eV. Optimization of geometric patterns were not, as a calculation model was evaluated by known and confirmed the experimental data (for layers of Sn, Al, Zr and Zn). Model calculations were carried out with sufficient accuracy to study the photostability.

To calculate the density levels used the scheme of Monkhorst-Pack. The calculation of the surface was performed using a "method of model layers with a density in the HAC is mind 10 A.

Examples of carrying out the invention

To illustrate the invention presents examples 1-14 (doping layer SiO2one of the following elements: Sn, Sb, In, Ge, Y, Nb, F, Mn, Cu, Mo, Cd, Ce, W and Bi), and comparative example 1 (only the layer of SiO2), comparative example 2 (doping layer SiO2magnesium) and comparative example 3 (doping layer SiO2aluminum).

The calculation of the level density for comparative example 1 was performed with full coverage of the surface of TiO2(110) monolayer SiO2. The overall structural cell 52 includes atom (Ti8Si8O36). Estimated pigment covered with atomic monolayer SiO2with a layer thickness of approximately 0.2 nm, the content of which is approximately 0.3 wt.% based on the weight of TiO2.

The content should be calculated using the following values: typical values of the specific surface by the equation of brunauer-Emmett-teller (BET) for particles of TiO2received the chloride method is 6.2 m2/g, a thickness of an atomic monolayer of 0.2 nm, the density of the layer of SiO22.2 g/cm3.

In examples 1-14 and comparative examples 2 and 3 describe the surface of TiO2atomic monolayer SiO2that is alloyed in an atomic ratio of 1 (alloying element (X) to 7 (Si), i.e. the General structural cell includes Ti8S 7X1O36. Pigment TiO2covered by a layer in which the content of the alloying element oxide is following values in wt.% based on the weight of TiO2:

Example 1: about 0.10 wt.% SnO2.

Example 2: about 0.09 wt.% Sb2O3.

Example 3: about 0.09 wt.% In2O3.

Example 4: about 0.07 wt.% GeO2.

Example 5: approximately 0.14 wt.% Y2O3.

Example 6: about 0.09 wt.% Nb2O5.

Example 7: about 0.01 wt.% F.

Example 8: about 0.06 wt.% MnO2.

Example 9: about 0.06 wt.% CuO.

Example 10: about 0.10 wt.% Moo3.

Example 11: about 0.09 wt.% CdO.

Example 12: about 0.10 wt.% CeO2.

Example 13: about 0.16 wt.% WO3.

Example 14: about 0.09 wt.% Bi2O3.

Comparative example 2: about 0.03 wt.% MgO.

Comparative example 3: about 0.04 wt.% Al2O3.

Results

The result of calculations by the method of quantum mechanics the CASTEP program is the electronic structure. Such a structure can be analyzed in the form of structural zones (allowed energy bands) or in the form of density levels (integrated energy levels).

Figure 1 shows simplified the th scheme (a) the electronic structure. The diagram shows only the width of the energy levels and the position of the energy bands. The distribution of the energy levels within the energy zones presented in the form of density levels (e).

Figure 2 shows the influence of the pure unalloyed layer of SiO2(comparative example 1) photoactivity TiO2: calculated levels of density for the surface of TiO2(110) uncoated shown by dashed line, and the density of the surface is covered with a layer of SiO2the solid line. The positive effect of a layer of SiO2on the photostability is manifested first in the decrease in the density level in the conduction band (CB) near the forbidden band, compared with the surface of TiO2without coating, thereby becoming difficult transition pairs e-IN the matrix, located sublayer, and the second positive effect is enhanced by additional reductions in the density level in the area of the valence near the forbidden zone (VB).

Figure 3 shows the effect of doping the layer of SiO2element Sn (example 1) at density levels compared to the coverage of SiO2.

In this case, there is an additional decrease in the density of levels VB near the forbidden zone, which leads to improved photostability.

Figure 4-8 shows the effect of doping the layer of SiO2various ele the customers: Sb (example 2, 4), In example 3, figure 5), Ge (example 4, 6), Y (example 5, 7) or Nb (example 6, Fig). In each case unexpectedly observed a decrease in the density of levels VB near the forbidden zone and increased photostability.

Similar doping layer SiO2elements Zr or Zn also leads to improved stability in comparison with the undoped layer of SiO2.

On Fig.9-16 shows the effect of alloying layer of SiO2different elements: F (example 7, figure 9), Mn (example 8, figure 10), Cu (example 9, 11), Mo (example 10, Fig), Cd (example 11, Fig), CE (example 12, Fig), W (example 13, Fig), Bi (example 14, Fig). In the case of doping the layer of SiO2elements F, Mn, Cu, Mo, Cd, CE, W and Bi unexpectedly observed the formation of additional energy levels within the forbidden zone, which are recombination centers for the pair e and thereby increases the photostability.

On Fig shows the influence of the alloying layer of SiO2element Mg (comparative example 2) at density levels. In this case, there is an increase in density levels VB near the forbidden zone, which leads to deterioration of photostability.

On Fig shows the influence of the alloying layer of SiO2element Al (comparative example 3) at density levels. In this case, there is an increase in density levels VB near the forbidden zone, which leads to deterioration of f is stabilnosti.

Calculated data of the energy levels strictly correlate with the experimental data analysis doped samples. Using the calculation methods described in this context, it is possible to choose the appropriate alloying elements to improve the photostability of pigment particles TiO2covered with a thick layer of SiO2(pigments coated with a thick film), and not to use chemical experiments by the method of "trial and error". Specialist in the art based on the present invention can calculate and choose known in the prior art and are not described in this context alloying elements and their combinations to improve the photostability of pigments with a dense layer. In prior art describes the use of the following alloying elements (on the basis of experimental research): for deposition from the gas phase (Al, In, Ge, Mg, Nb, P, and Zr, and a chemical method in the liquid phase - Ag, Al, B, BA, Be, Ca, Cd, Co, Cr, Cu, Mg, Mn, Ni, Nb, Sn, Sr, Ti, Zn and Zr.

Ways to get

Known methods of applying a thick layer of SiO2particles of titanium dioxide. The standard method is carried out in aqueous phase. You get a suspension of particles of SiO2optionally treated with a dispersing agent and, if necessary, pulverized in a wet form. Sardanapale layer of SiO 2usually carried out by adding a solution of alkali metal silicate and bringing the pH to the desired value. The alloying element is applied in the form of a salt solution in a mixture with a solution of silicate, or separately, before adding a solution of silicate or after it.

The person skilled in the art known in the art suitable connections and the required amount to increase the pH in order to obtain a dense layer.

Doping according to the invention dense layers of SiO2carried out, for example, adding a suspension of the following salts, without limitation.

Doping Sb: antimony chloride, oxychloride of antimony, fluoride, antimony, sulfate of antimony.

Doping In: chloride India, sulfate India.

Doping of Ge: Germany chloride, germanate.

Alloying Y: yttrium chloride, yttrium fluoride.

Doping Nb: niobium chloride, niobate.

Alloying F: fluoride, fluoride.

Doping of Mn: manganese chloride, manganese sulfate.

Alloying Cu: copper chloride, copper sulfate.

Alloying Mo: chloride molybdenum, molybdate.

Doping Cd: cadmium chloride, cadmium sulfate.

The doping of CE: cerium nitrate, cerium sulfate.

Alloying W: tungstate.

Doping of Bi: bismuth nitrate, bismuth sulfate.

In the most preferred embodiment of the present invention in a known manner on the particles of the NAS is placing additional outer layer hydrate of aluminum oxide from the liquid phase.

In another embodiment, the surface of the particles applied a thick layer of SiO2from the gas phase. There are several ways of applying such layers.

Examples include the application in a fluidized bed at a temperature of less than approximately 1000C, as described in U.S. patent No. 3552995, in the United Kingdom patent GB 1330157 or in the patent application U.S. No. 2001/0041217 A1.

In another embodiment, the layer is applied directly in a tubular reactor, adding in the process of formation of particles of TiO2chloride method as described, for example, in patent applications WO 98/036441 A1, EP 0767759 B1, EP 1042408 B1 and WO 01/081410 A2. Typically, when applying a layer in a tubular reactor as a predecessor SiO2use the halide of silicon, primarily SiCl4which usually add down the stream in place of the mixing streams of reagents TiCl4and AlCl3oxygen-containing gas.

For example, in international publication WO 01/081410 A2 describes the addition of a halide of silicon in one place, and the completeness of the reaction of formation of TiO2is at least 97%. In all cases the temperature when the input is more than 1000C., more preferably 1200C. Connection-the predecessor of SiO2oxidized with formation of a dense layer of silicon dioxide on the surface of the particles of TiO2. In contrast to the formation of a layer of liquid-phase chemical method, when on the yeseniya layers from the gas phase using layers of oxides, not containing water or a hydrate, which adsorb hydroxyl ions and water molecules only on its surface.

The alloying element is added in the form of connection predecessor in parallel connection with the predecessor SiO2or down the flow or against the flow of the particles. In this case, the temperature of the stream of particles at the entrance of the reactants is more than 1000C., more preferably 1200C. Below lists suitable connections precursor of various alloying elements, without limitation.

Alloying Sn: tin halide, such as chloride of tin.

Doping Sb: antimony halide, such as chloride of antimony.

Doping In: halide India, such as chloride India.

Alloying Y: yttrium halide, such as chloride of yttrium.

Doping of Zr: zirconium halide, such as chloride of zirconium.

Doping of Zn: zinc halide such as zinc chloride.

Doping Nb: niobium halide, such as chloride niobium.

Alloying F: fluorine, hydrogen fluoride, the fluoride.

Doping of Mn: manganese chloride.

Alloying Cu: copper chloride.

Alloying Mo: chloride molybdenum.

Doping Cd: cadmium chloride.

Doping of CE: cerium chloride.

Alloying W: tungsten chloride.

Doping of Bi: bismuth chloride.

In the most preferred embodiment, the particles cause will complement the local outer layer of aluminum oxide, when this downstream particles add a suitable compound, the precursor of aluminium oxide, for example, AlCl3.

Thus, covered with dense alloyed layer of SiO2the pigment particles of titanium dioxide can be processed by the known methods regardless of the method of applying a layer of slurry or gas phase. For example, you can apply other inorganic layers of one or more metal oxides. When this surface is again treated with nitrate and/or provide a surface treatment with an organic compound. For processing particles according to the invention using known methods of surface treatment of the pigment particles of titanium dioxide according to the invention organic compounds, for example, using an organic silane, an organic siloxane, an organic phosphonate, and the like, or a polyalcohol, and trimethylated (TMA) or trimethylpropane (TSR), etc.

Particles of titanium dioxide according to the invention can be used as additives for plastics, paints, varnishes and paper. They can also be used as source material in suspension to obtain, for example, paper or coating.

1. Particle pigment of titanium dioxide deposited on the surface of a dense layer of silicon dioxide (SiO2), characterized in that the layer is deposited from a gas fasii is alloyed, at least one alloying element selected from the group comprising Sn, Sb, In, Y, Zn, F, Mn, Cu, Mo, Cd, Ce, W and Bi, or a mixture.

2. Particle according to claim 1, characterized in that it has an additional layer of aluminum oxide or hydrate of aluminum oxide.

3. Particle according to claim 2, characterized in that it is characterized by the content of aluminum in the form of Al2O3from 0.5 to 6.0 wt.%, preferably from 1.0 to 4.0 wt.% calculated on the total weight of the pigment.

4. Particle according to claim 1, characterized in that it is characterized by the content of silicon as SiO2in the dense layer is from 0.1 to 6.0 wt.%, preferably from 0.2 to 4.0 wt.% calculated on the total weight of the pigment.

5. Particle according to claim 1, characterized in that it is characterized by the content of the alloying element in the dense layer in the form of oxide, and in the case of F - in the form of item, from 0.01 to 3.0 wt.%, preferably from 0.05 to 2.0 wt.% calculated on the total weight of the pigment.

6. Particle pigment of titanium dioxide deposited on the surface of a dense layer of silicon dioxide (SiO2), characterized in that the layer is deposited from the liquid phase and when it is alloyed, at least one alloying element selected from the group comprising Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi, or a mixture.

7. Particle according to claim 6, characterized in that it has an additional layer of aluminum oxide or hydrate of aluminum oxide.

8. Particle according to claim 7, characterized in that it is characterized by the content of aluminum in the form of Al2O3from 0.5 to 6.0 wt.%, preferably from 1.0 to 4.0 wt.% calculated on the total weight of the pigment.

9. Particle according to claim 6, characterized in that it is characterized by the content of silicon as SiO2in the dense layer is from 0.1 to 6.0 wt.%, preferably from 0.2 to 4.0 wt.% calculated on the total weight of the pigment.

10. Particle according to claim 6, characterized in that it is characterized by the content of the alloying element in the dense layer in the form of oxide, and in the case of F - in the form of item, from 0.01 to 3.0 wt.%, preferably from 0.05 to 2.0 wt.% calculated on the total weight of the pigment.

11. The method of producing pigment particles of titanium dioxide coated on its surface with a dense layer of silicon dioxide (SiO2), alloyed, at least one alloying element selected from the group comprising Sn, Sb, In, Y, Zn, F, Mn, Cu, Mo, Cd, Ce, W and Bi, or a mixture thereof, wherein the first titanium chloride was transferred to the reactor in the gas phase at temperatures over 1000C in the presence of aluminum halide and a gas containing oxygen, the resulting mixture is then directed into a stream of particles containing TiO2that after this contact, at least two connections, the first of these compounds is a compound, the precursor of silicon oxide, and the second of these soy is inany selected from the group including compounds, the precursors of oxides of Sn, Sb, In, Y, Zn, Mn, Cu, Mo, Cd, CE, W and Bi and connections-the predecessors of F, or a mixture thereof, and, finally, the particle stream is cooled.

12. The method according to claim 11, characterized in that it includes an additional coating layer of aluminum oxide from the gas phase.

13. The method according to claim 11, characterized in that it includes an additional coating the surface of particles of the layer hydrate of aluminum oxide from the liquid phase.

14. The method according to any of PP or 13, wherein the additional coating is carried out until the content of aluminum in the form of Al2O3from 0.5 to 6.0 wt.%, preferably from 1.0 to 4.0 wt.% calculated on the total weight of the pigment.

15. The method according to any of PP or 13, characterized in that it further includes processing the pigment particle organic compound.

16. The method according to claim 11, characterized in that a dense layer of precipitated until the content of silicon as SiO2from 0.1 to 6.0 wt.%, preferably from 0.2 to 4.0 wt.% calculated on the total weight of the pigment.

17. The method according to claim 11, characterized in that a dense layer containing precipitated alloying element in the form of the oxide or in the case of F as element from 0.01 to 3.0 wt.%, preferably from 0.05 to 2.0 wt.% calculated on the total weight of the pigment.

18. The method according to any of 11, 16, or 17, characterized in that the connection of the predecessor SiO2and oxide l is giraudeau element using the corresponding halide, preferably the corresponding chloride.

19. The method of producing pigment particles of titanium dioxide coated on its surface with a dense layer of silicon dioxide (SiO2), alloyed, at least one alloying element, wherein the first at pH approximately 10 receive aqueous suspension of particles of TiO2then add an aqueous solution of an alkaline component of silicon and at least one aqueous solution of the component containing the alloying element chosen from the group comprising Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi, or a mixture, and then by reducing the pH of the slurry to less than 9, preferably less than 8, precipitated on the surface of particles of a dense layer of SiO2alloyed, at least one alloying element selected from the group comprising Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi, or a mixture.

20. The method according to claim 19, characterized in that it includes an additional coating the surface of particles of the layer hydrate of aluminum oxide from the liquid phase.

21. The method according to claim 20, wherein the additional coating is carried out until the content of aluminum in the form of Al2O3from 0.5 to 6.0 wt.%, preferably from 1.0 to 4.0 wt.% calculated on the total weight of the pigment.

22. The method according to claim 20, characterized in that it further includes processing the pigment particle organic compound.

23. The method according to claim 19, great for the decomposing those what a dense layer of precipitated until the content of silicon as SiO2from 0.1 to 6.0 wt.%, preferably from 0.2 to 4.0 wt.% calculated on the total weight of the pigment.

24. The method according to claim 19, characterized in that a dense layer containing precipitated alloying element in the form of the oxide or in the case of F as element receive from 0.01 to 3.0 wt.%, preferably from 0.05 to 2.0 wt.% calculated on the total weight of the pigment.

25. Particle pigment of titanium dioxide, characterized in that it is obtained by any of 11-24.

26. Application of the pigment particles of titanium dioxide according to any one of claims 1 to 10 or 25 as a tool in the manufacture of plastics, paints, varnishes and paper.

27. Application of the pigment particles of titanium dioxide according to any one of claims 1 to 10 or 25 as a starting material in the manufacture of paper or coating, characterized in that the particles used in the form of a suspension.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention can be used to produce a pigment suitable in making paper for ink-jet printing. Precipitated calcium carbonate is obtained by mixing quicklime with water in a reactor or a tank with a mixer, followed by filtration of the calcium hydroxide suspension to remove all residual contaminants and/or non-reactive quicklime. The filtered suspension is then fed into a stainless steel reactor fitted with a mixer. Temperature is kept in the range of 10-70C, after which the suspension is fed into a carbonisation reactor, where a carbon dioxide-containing gas is bubbled through the suspension. The carbonisation step is carried out at carbonisation gas flow rate of less than 30 litres per minute per kilogram of calcium hydroxide during precipitation under normal conditions. The suspension is removed from the tank when conductivity reaches the minimum level and pH drops below 8, wherein large particles are removed through a filter. The obtained calcium carbonate can be used as a pigment.

EFFECT: invention improves the quality of ink-jet printing while reducing the cost of production of paper for ink-jet printing.

15 cl, 5 dwg, 17 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: titanium dioxide based pigment contains titanium dioxide particles in rutile form, having a coating. The coating contains aluminium phosphate, aluminium oxide, titanium oxide and silicon oxide. The particles are characterised by specific surface area, calculated according to a Brunauer-Emmet-Teller (BET) equation, of at least 15 m2/g. To obtain coated pigments, an aqueous suspension of uncoated titanium dioxide particles is prepared first, followed by addition of aluminium-containing and phosphorus-containing components. Further, while maintaining pH 4-9, an alkaline silicon-containing component and at least one pH regulating component, one of which is an acidic titanium-containing component, are then added. The formed suspension is then filtered, washed and dried and the precipitate is ground to obtain coated particles.

EFFECT: invention increases opacity of decorative paper.

22 cl, 5 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention can be used in production of tissue paper. Surface-treated natural calcium carbonate is used as filler in tissue paper products, where said calcium carbonate is a product of reaction of natural calcium carbonate with an acid and carbon dioxide. The carbon dioxide is formed in situ by treatment with the acid and/or is fed from an external source. The surface-treated natural calcium carbonate is obtained as an aqueous suspension having pH higher than 6.0, measured at 20C.

EFFECT: invention improves softness of tissue paper products such as facial tissue, toilet paper, ornamental paper, towels, napkins or tissue paper cloths.

47 cl, 1 dwg, 5 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: titanium dioxide based pigment, containing titanium dioxide particles, has a coating layer containing aluminium phosphate and aluminium oxide, and said layer additionally contains hollow particles. To obtain said pigment, aqueous suspension of titanium dioxide is prepared first, and aluminium- and phosphorus-containing components are then added, after which hollow particles are added and pH of the suspension is brought to 4-9. Also, aqueous suspension of titanium dioxide can be obtained at pH not lower than 10, and aluminium- and phosphorus-containing components can then be added while maintaining pH of at least 10, after which hollow particles are added. Further, pH of the suspension is brought to 4-9 and an aluminium oxide coating is then applied at pH from 4 to 9.

EFFECT: invention increases opaqueness and retention of pigment when making decorative paper.

22 cl, 1 dwg, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of producing jointly ground calcium carbonate material, which contains ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) with coefficient of curvature at least equal to approximately 30, preferably at least approximately 40 and even more preferably at least approximately 45, comprises the following steps: a) obtaining at least one calcium carbonate material, optionally, in form of an aqueous suspension; b) combined grinding of GCC and PCC, optionally, with at least another mineral material which is selected from talc, clay, Al2O3, TiO2 or mixtures thereof; c) optional sieving and/or concentration of the jointly ground calcium carbonate obtained after step (b); d) optional drying of the jointly ground calcium carbonate material obtained after step (b) or (c). The coefficient of curvature is defined as d30/d70100, where d30 and d70 denote equivalent spherical diameters, relative which 30 wt % and 70 wt % particles have a smaller size.

EFFECT: invention enables to improve optical properties of enamel paper and exclude the PCC deagglomeration step.

40 cl, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of producing jointly ground calcium carbonate material, which contains ground calcium carbonate (GCC) material and precipitated calcium carbonate (PCC) comprises the following steps: a) obtaining at least one calcium carbonate material, optionally, in form of an aqueous suspension; b) combined grinding of GCC and PCC, optionally, with at least another mineral material which is selected from talc, clay, Al2O3, TiO2 or mixtures thereof; c) optional sieving and/or concentration of the jointly ground calcium carbonate obtained at step (b); d) optional drying of the jointly ground calcium carbonate material obtained at step (b) or (c). The fraction of particles of the obtained material with size smaller than 1 mcm is greater than 80%, preferably greater than 85%, more preferably greater than 90% and even more preferably greater than 95%. BET specific surface area is less than 25 m2/g.

EFFECT: invention enables to increase lustre of enamel paper.

44 cl, 2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: suspension containing calcium carbonate is obtained by adding one or more zirconium compounds and possibly one or more other additives which do not contain phosphate, acting as a dispersant and/or an additive which assists in grinding. Calcium carbonate in dry form and/or in form of an aqueous dispersion or filtered residue is added an aqueous suspension and/or aqueous emulsion and/or aqueous solution containing one or more zirconium compounds. The zirconium compounds used is ammonium zirconium carbonate or calcium zirconium carbonate or mixture thereof.

EFFECT: invention enables to avoid the use of phosphate dispersants when preparing stable aqueous suspensions of calcium carbonate and increases content of solid substance in the suspension.

17 cl, 22 ex

FIELD: printing industry.

SUBSTANCE: to produce a precipitated calcium carbonate, a suspension of calcium hydroxide is made by mixing of quicklime with water in a reactor with a mixer or in a tank, then the produced suspension is filtered via a 100-mcm filter. The filtered suspension is sent into a reactor of stainless steel equipped with a mixer. Temperature from 10 to 70C is set, afterwards the suspension is sent into a reactor or a tank for carbonisation, where a carbon-containing gas is bubbled through the suspension. The suspension is drained from the tank, when electric conductivity achieves the minimum level, and pH falls below 8. Coarse particles are removed at a 45-mcm filter. At the same time the carbonisation stage is carried out at speed of carbonising gas flow of below 30 litres per minute under normal conditions per kg of calcium hydroxide in process of deposition. Concentration of precipitated calcium carbonate is increased using a cationic, anionic or combined disperser under quite moderate or mild conditions, which do not cause considerable damage of aggregates/agglomerates, until concentration from 25 to 60% is achieved, preferably in the range from 35 to 50%, most preferably - from 39 to 40 wt % of hard substances.

EFFECT: invention makes it possible to produce porous stable agglomerates of precipitated calcium carbonate with size of 1-5 mcm.

22 cl, 5 dwg, 17 tbl, 9 ex

FIELD: printing industry.

SUBSTANCE: to produce a precipitated calcium carbonate, a suspension of calcium hydroxide is made by mixing of quicklime with water in a reactor with a mixer or in a tank, then the produced suspension is filtered via a 100-mcm filter. The filtered suspension is sent into a reactor of stainless steel equipped with a mixer. Temperature from 10 to 70C is set, afterwards the suspension is sent into a reactor or a tank for carbonisation, where a carbon-containing gas is bubbled through the suspension. The suspension is drained from the tank, when electric conductivity achieves the minimum level, and pH falls below 8. Coarse particles are removed at a 45-mcm filter. At the same time the carbonisation stage is carried out at speed of carbonising gas flow of below 30 litres per minute under normal conditions per kg of calcium hydroxide in process of deposition. Concentration of precipitated calcium carbonate is increased without using an agent that promotes dispersion or with application of a cationic disperser under quite moderate or mild conditions, which do not cause considerable damage of aggregates/agglomerates, until concentration from 15 to 50% is achieved, preferably in the range from 20 to 30%, most preferably - from 23 to 26 wt % of hard substances.

EFFECT: invention makes it possible to produce porous stable agglomerates of precipitated calcium carbonate.

22 cl, 5 dwg, 9 tbl, 12 ex

FIELD: textile fabrics, paper.

SUBSTANCE: method is related to production of coated paper or cardboard. Method includes application of pigment composition as coating on at least one side of paper or cardboard web. Specified pigment composition is water dispersion, which includes optionally aggregated colloidal particles of silicon dioxide or aluminium silicate as pigment particles, which are prepared from alkali metal silicate by ion exchange or pH reduction and having surface area of approximately from 30 m2/g to approximately 450 m2/g. Coating contains also at least one cationic component selected from group that consists of water-soluble aluminium salts and cationic polymers with molecular weight from approximately 2,000 to approximately 1,000,000 and charge density from approximately 0.2 mEq/g to approximately 12 mEq/g, in which at least approximately 0.4 g of pigment particles from pigment composition is applied on m2 of coated side of paper or cardboard web. Invention is also related to paper or cardboard produced by this method. It is also related to composition of above mentioned pigment in the form of water dispersion, which includes less than approximately 3 wt % of organic binders and to method of above mentioned pigment composition production, in which mixing is done to produce water dispersion in order to avoid gel formation and deposition.

EFFECT: improvement of printing and strength properties of coating, and also lower scuffing of paper.

26 cl, 5 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: titanium dioxide based pigment contains titanium dioxide particles in rutile form, having a coating. The coating contains aluminium phosphate, aluminium oxide, titanium oxide and silicon oxide. The particles are characterised by specific surface area, calculated according to a Brunauer-Emmet-Teller (BET) equation, of at least 15 m2/g. To obtain coated pigments, an aqueous suspension of uncoated titanium dioxide particles is prepared first, followed by addition of aluminium-containing and phosphorus-containing components. Further, while maintaining pH 4-9, an alkaline silicon-containing component and at least one pH regulating component, one of which is an acidic titanium-containing component, are then added. The formed suspension is then filtered, washed and dried and the precipitate is ground to obtain coated particles.

EFFECT: invention increases opacity of decorative paper.

22 cl, 5 ex, 1 tbl

FIELD: textiles, paper.

SUBSTANCE: method includes the sequential addition of flocculating agents of high and low molecular weight to aqueous dispersion of the filler particles followed by grinding of the resulting flakes of the filler to the desired particle size to obtain flakes of the filler resistant to grinding with a specific and controlled particle distribution.

EFFECT: improvement of quality of printed products, cost reduction for raw materials and energy.

14 cl, 10 ex, 7 tbl, 1 dwg

FIELD: textiles, paper.

SUBSTANCE: composition comprises: a) a filler, b) a cationic inorganic compound - polyaluminumchloride, c) a cationic organic compound, and d) anionic polysaccharide. The filler is present in an amount of at least about 1% by weight, based on the total weight of the composition. Anionic polysaccharide is present in an amount from about 1 to about 100 kg/ton based on the weight of the filler. The composition is substantially free of fibers. Filler composition of the version contains the components a), b), c) and d), as defined above. The only difference is that the component c) is a cationic polyamine condensation polymer, and the component d) has a degree of substitution of stoichiometrically excess anionic groups of up to about 0.65. At that each of b) and c) components present in an amount from about 0 to about 30 kg/ton based on the weight of the filler. At that the composition comprises at least one of b) and c) components. Methods of obtaining compositions of filler comprise mixing a), b), c) and d), as defined above. The invention also relates to a filler composition, which is obtained by this method, an application of the filler composition as an additive to an aqueous suspension of cellulose in the production process of paper and to manufacturing paper comprising adding a filler composition to an aqueous suspension of cellulose. The invention also relates to a paper obtained with this method, and paper comprising the filler composition.

EFFECT: improvement of composition.

35 cl, 1 dwg

FIELD: textiles, paper.

SUBSTANCE: invention relates to the production of hydrophilic fibrous composite materials for medical purposes, having bactericidal, hemostatic and anesthetic effect. Biologically active fiber sheeting is made in the form of fibrous base that contains cellulose, viscose fiber and a binder; the base is coated with a material containing additives in the immobilised form. The material has a weight of 75-90 g/m2, the weight of the coating is 35-50% relative to the weight of the fibrous weight. As a binder in the base a polyamine-poliamidepichlorohydrin resin is used. The coating is made on the basis of a cationic polysaccharide of natural origin. At that the additive is a blood-coagulation factor IV, antifibrinolytics, anesthetic, antimicrobial and plastifying agents.

EFFECT: reduction of quantity of fibrous materials in manufacture of the basics, and also it has new favourable features, namely, antimicrobial, hemostatic and analgesic effects.

3 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: titanium dioxide based pigment, containing titanium dioxide particles, has a coating layer containing aluminium phosphate and aluminium oxide, and said layer additionally contains hollow particles. To obtain said pigment, aqueous suspension of titanium dioxide is prepared first, and aluminium- and phosphorus-containing components are then added, after which hollow particles are added and pH of the suspension is brought to 4-9. Also, aqueous suspension of titanium dioxide can be obtained at pH not lower than 10, and aluminium- and phosphorus-containing components can then be added while maintaining pH of at least 10, after which hollow particles are added. Further, pH of the suspension is brought to 4-9 and an aluminium oxide coating is then applied at pH from 4 to 9.

EFFECT: invention increases opaqueness and retention of pigment when making decorative paper.

22 cl, 1 dwg, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: method of obtaining at least one inorganic substance and/or at least one pigment containing natural and/or precipitated calcium carbonate, preferably natural, simultaneously partially organophilic and partially hydrophilic, comprises the following steps: a) obtaining at least one inorganic substance and/or at least one pigment containing natural and/or precipitated calcium carbonate, preferably natural, in dry form or in form of aqueous dispersion and/or suspension, b) if needed, dry grinding and/or grinding in aqueous medium of the inorganic substance and/or pigment obtained at step a), c) treating the inorganic substance and/or pigment obtained at step a) and/or step b), d) if needed, drying the inorganic substance and/or pigment obtained at step a) and/or b) and/or c). Step c) corresponds to a step for mixing in aqueous medium and/or grinding in aqueous medium and/or concentration in aqueous medium of the inorganic substance and/or pigment obtained at step a) and/or step b) in the presence of at least one ethylene acrylic acid salt. A dispersant and/or grinding agent is added before and/or during the treatment step c).

EFFECT: invention enables to increase content of dry substance in calcium carbonate suspensions while maintaining satisfactory viscosity without formation of agglomerates.

67 cl, 1 tbl, 1 ex

FIELD: textile, paper.

SUBSTANCE: method includes moistening pulp lap with water solution of sodium salt of carboxymethylcellulose (NaCMC), included into composition of the paste made of a filler (chalk), mixed with a solution of NaCMC at the filler ratio of NaCMC equal to 100:(1-2). Production of moisture-saturated air suspension of fibres with filler from it. Forming a fibrous later on a shaping mesh. Moistening of a fibrous layer between two clothes, pressing and drying of a paper leaf. The filler is added as a paste, which contains 30% of dry substance. Moistening of a fibrous layer prior to pressing is carried out with a starch solution with concentration of 0.7-1.3%.

EFFECT: increased retention of filler in paper at simultaneous increase of paper strength index.

3 cl, 1 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: method of filler treatment includes formation of a mixture of an aqueous suspension of filler and aqueous anion latex. The latter is a dispersion of acrylic polymer with vitrification temperature (T v) from - 3 to 50C. This mix is mixed with water at the temperature that is higher than T v of latex, at the same time the specified water has temperature of 40-98C. The specified suspension of the filler comprises a solid disperse filler selected from the group containing kaolin clay, ground calcium carbonate, deposited calcium carbonate, deposited calcium sulfate, talc and mix of two or more of them. The specified acrylic polymer is selected from the group containing copolymers n-butylacrylate-acrylonitrile-sterol and copolymers n-butylacrylate-sterol. The aqueous composition of the filler contains the solid dispersed filler specified above with solid particles of anion latex polymer specified above and adsorbed on them, in aqueous carrier. The treated filler contains the solid dispersed filler specified above with solid particles of anion latex polymer specified above and adsorbed on them. The pulp charge contains pulp fibres and the solid dispersed filler specified above with solid particles of anion latex polymer specified above and adsorbed on it, in aqueous carrier. Method to make paper from the above specified pulp charge containing pulp fibres. The paper product made of pulp fibres and solid disperse filler, where the specified filler has solid particles of anion latex polymer specified above absorbed on it, with size of solid polymer particles of 30-200 nm and in amount of 1-100 kg of latex per 1 t of filler relative to dry mass of solid substances of latex and filler, and the specified filler has average size of particles of 0.1-30 mcm.

EFFECT: improved retention of the filler, continuous execution of the filler treatment method to improve fixation of anion latex on the filler for a short period of time due to irreversible fixation of anion latexes on particles of the filler and time stability of aggregated filler suspension, latex-treated deposited calcium carbonate is more acid-resistant, and when used to make paper from wood mass under neutral conditions less acid is required to control pH.

21 cl, 14 dwg, 8 ex

FIELD: textile, paper.

SUBSTANCE: method includes dissolution of cellulose and its grinding down to specified extent of grinding. Preparation of the first dispersion with application of return water, containing fibres of microcrystal cellulose, produced by its grinding in mixture with titanium dioxide and calcium hydroxide in specified amount. The second dispersion is prepared from cellulose fibres with application of return water. Then the first suspension is mixed with the second, and produced mixture is treated with carbon dioxide. In case of this treatment calcium hydroxide under action of carbon dioxide results in production of chemically deposited chalk and production of paper mass at specified ratio of components. Grinding of microcrystalline cellulose in mixture with titanium dioxide and calcium hydroxide is carried out in vibration mill with provision of impact and wear effect at mixture.

EFFECT: increased extent of fillers retention in paper, improvement of its printing properties, provision of possibility to vary bulk and porosity of paper, provision of possibility to use fully closed cycle of return water.

1 tbl, 8 ex

FIELD: medicine.

SUBSTANCE: described is material for application in wound care. Material is made in form of fibrous base with applied on it functional coating, which contains polyvinyl alcohol with degree of water absorption up to 2100%, carnon-modified aluminium oxide with specific surface area up to 300cm2/g, as well as sodium-carboxymethylcellulose as binding agent. From the side of coating material is provided with atraumatic material which ensures non-adherence of material to wound.

EFFECT: improvement of therapeutic and preventive care.

2 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to a solid dispersed material for use in rubber vulcanisation and a method for production thereof. The solid dispersed material is coated with a coating which contains a formed complex of aceto-metallised sodium salt and a transition metal.

EFFECT: use of the solid dispersed material during rubber vulcanisation cuts the amount of transition metal oxide used in the vulcanisation process.

51 cl, 8 tbl, 5 ex, 4 dwg

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