Pigment dispersion

FIELD: chemistry.

SUBSTANCE: described is a method of producing an essentially aqueous pigment dispersion which is essentially free from organic binder and dispersions obtained using said method. The method involves mixing a water-soluble or water-dispersable silane compound and particles of colloidal silicon dioxide with weight ratio of silane to silicon dioxide from 0.25 to 1.5 to form particles of silanised colloidal silicon dioxide in an aqueous dispersion. Said particles of colloidal silicon dioxide are further mixed with an organic and/or inorganic pigment with weight ratio of silicon dioxide to pigment from about 0.001 to about 0.8, to form said essentially aqueous pigment dispersion. Described also is use of the disclosed pigment dispersion when applying coatings and for reducing formation of bubbles on non-absorbent substrates.

EFFECT: disclosed pigment dispersion has high resistance to flocculation and high stability over time.

20 cl, 5 tbl, 13 ex

 

This invention relates to a water dispersion of a pigment, the method of obtaining this variance and its application.

The prior art inventions

Inorganic pigments often enter into various polymers as bleach, tint agents or substances, which impart opacity. In particular, for these purposes, the applicable pigments such as TiO2because they scatter light very effectively. These pigments may be present in the dispersions of pigments known from, for example, U.S. patent 5886069 offering particles of TiO2c discrete inorganic particles, dispergirovannykh on the surface of the particles of TiO2. However, these dispersions are generally not sufficiently stable and cannot be stored for a long period of time without destabilizing or gelation, leading to a significant reduction in the efficiency of light scattering. These dispersions may also suffer from optical seal, if particles of TiO2too closely contact with each other. The result can be markedly reduced covering power and intensity (pigment). To maintain the efficiency of scattering in space (between) particles of TiO2in the compositions of the dyes were added thinners. However, the distribution of diluents hard and he shall affect the covering power. It is desirable to obtain a water dispersion of pigment in the absence of dispersing agents such as surfactants. Surfactants can cause problems with foaming dispersion, which in turn can damage resistance and chemical resistance.

In patent WO 2004/035474 A1 proposed particles silanizing colloidal silicon dioxide in combination with an organic binder. Organic binders, however, can disrupt the stability of the dispersion of the pigment. The process of dispersion of the pigment in the presence of organic binders may also require the submission of additional energy, as may be necessary to have higher shearing forces. Moreover, the presence of organic binder reduces the amount of dispersible pigment, which in turn reduces the resulting efficiency of light scattering.

This invention relates to an improved method of obtaining a water dispersion of a pigment having high stability. One of the additional aspects of the invention is a method of allowing longer storage and stability during storage, which provides useful properties of the pigment, such as the efficiency of light scattering while adding to any composition containing the dyes.

Invention

This and the finding relates to a method for obtaining essentially aqueous dispersion of pigment, essentially free of organic binder, providing a mixture of a water-soluble or dispersible in water, silane compounds and particles of colloidal silica with particle formation silanizing colloidal silicon dioxide in water dispersion, and at least one compound of silane mixed with particles of colloidal silicon dioxide in a weight ratio of silane to silicon dioxide from about 0.2 to about 1.5, mixing these particles silanizing colloidal silicon dioxide with organic and/or inorganic pigment, and the mass ratio of silicon oxide to pigment is from about 0.001 to about 0.8 with the formation of this mainly water dispersion of pigment.

The term "substantially or essentially free from organic binder" understand the content of the organic binder in the aqueous dispersion of the pigment is less than about 15, for example, less than about 10, or less than about 5, for example, less than about 3, or less than about 1, or less than about 0.1 wt.%. Thus, according to one of embodiments dispersion receive so that the resulting dispersion contains an organic binder in an amount less than the specified limits.

According to one embodiments the silane and particles colloidnochemical silicon are mixed in a mass ratio of silane to silicon dioxide in the range of from about 0.25 to about 1.5, for example, from about 0.3 to about 1.2, or from about 0.35 to about 0.8, or from about 0.4 to about 0.8.

The silane compounds can form stable covalent siloxane bond (Si-O-Si) with silanol groups or be associated with silanol groups, for example, hydrogen bonds on the surface of particles of colloidal silicon dioxide.

According to one of embodiments a mixture of silane and particles of colloidal silicon dioxide can be carried out continuously, for example, at a temperature of from about 20 to about 95, or from about 50 to about 75, such as, for example, from about 60 to about 70°C. the silane can slowly be added to the particles of silicon dioxide under vigorous stirring with a controlled speed, which are respectively equal to from about 0.01 to about 100, for example, from about 0.1 to about 10, or from about 0.5 to about 5, such as from about 1 to about 2 molecules silane at nm2surface area of colloidal silica (particle colloidal silicon dioxide) per hour. The addition of silane may be continued during any suitable time depending on the speed of injection, the amount of silane that should be added, and the desired degree of silanization. However, the introduction of silane can last up to about 5 hours, for example, up is about 2 hours, until you added the appropriate amount of silane. A suitable amount of silane added to the colloidal particles of silicon dioxide is from about 0.1 to about 6, for example, from about 0.3 to about 3, or from about 1 to about 2 molecules of silane at nm2the surface area of the particles of colloidal silicon dioxide.

A mixture of silane and silicon dioxide can be carried out at a pH from about 1 to about 13, for example, from about 6 to about 12, or from about 7.5 to about 11, or from about 9 to about 10.5.the

Particles of colloidal silicon dioxide are also related to the colloidal solution of silicic acid and can be obtained from, for example, precipitated silica, microsilica (vapors of silicon dioxide), fumed silica (fume silica)or silica gel is sufficient purity, or mixtures thereof.

Particles of colloidal silica and colloidal solutions of silicic acid can be modified and can contain other components, such as amines, aluminum and/or boron, which may be present in the particles and/or in the continuous phase. Colloidal solutions of silicate modified with boron, as described, for example, in U.S. patent 2630410. Particles of silicon dioxide, modified aluminum, usually contain Al2O3from the example is about 0.05 to about 3 wt.%, for example, from about 0.1 to about 2 wt.%. The way to obtain a colloidal solution of silicic acid, modified aluminum, additionally described, for example, in "The Chemistry of Silica" Iler, Ralf K., str-409, John & Sons (1979) and in U.S. patent 5368833.

Suitable for use particles of colloidal silicon dioxide have an average particle diameter in the range of from about 2 to about 150, for example, from about 2 to about 100, or from about 3 to about 50, or from about 4 to about 40, or from about 4 to about 15, or from about 5 to about 12 nm. Suitable colloidal particles of silicon dioxide have a specific surface area of from about 20 to about 1500, for example, from about 50 to about 900, or from about 70 to about 600, or from about 200 to about 500 m2/year

Particles of colloidal silicon dioxide can have a narrow distribution of particle size, i.e. low relative standard deviation of particle size. The relative standard deviation of the distribution of particle size is the ratio of the standard deviation of the distribution of particle size to the average size of the particles in the figures. The relative standard deviation of the distribution of particle size may be less than about 60% in numbers, for example, less than about 30% by number or less than about 15% in numbers.

Particles of the colloidal silicon dioxide, accordingly, dispersed in an aqueous solvent, usually in the presence of stabilizing cations, such as+, Na+Li+, NH4+, organic cations, primary, secondary, tertiary and Quaternary amines or mixtures thereof thereby to form a colloidal solution of silicic acid. However, it can also be used colloidal silicon dioxide, dispersed in a partially organic dispersions, including, for example, lower alcohols, acetone or mixtures thereof, in which the amount of organic parts, typically ranges from about 1 to about 20, for example, from about 1 to about 10, or from about 1 to about 5% by volume of the total aqueous and organic volume. According to one of embodiments of the particles of colloidal silicon dioxide are negatively charged. Accordingly, the content of silicon dioxide in the colloidal solution is from about 1 to about 80, for example, from about 5 to about 80, or from about 10 to about 80, for example, from about 20 to about 80, for example, from about 25 to about 70, or from about 30 to about 60 wt.%. (The value of) the pH of the colloidal solution of silicic acid, respectively, is from about 1 to about 13, for example, from about 6 to about 12 or from about 7.5 to about 11. However, for a colloidal solution of silicic acid, m is definerowana aluminum, pH, respectively, equal to from about 1 to about 12, or from about 3.5 to about 11.

A colloidal solution of silicic acid can have the indicator S (S-value from about 20 to about 100, for example, from about 30 to about 90, or from about 60 to about 90.

The index S indicates the degree of aggregation of particles of colloidal silicon dioxide, that is, the degree of formation of aggregates or microgels. The index S can be measured and calculated according to the formulas given in J.Phys.Chem. 60(1956), 955-957 Iler, R.K. & Dalton, R.L.

Rate S depends on the content of silicon dioxide, the viscosity and density of the particles of colloidal silicon dioxide. High index S indicates a low content of microgel. Figure S shows the number of SiO2in mass percent, present in the dispersed phase, for example, a colloidal solution of silica. The degree of microgel can be controlled in the process of obtaining, as further described, for example, in U.S. patent 5368833.

According to one of embodiments to further increase stability to the particles silanizing colloidal silicon dioxide can be mixed silicates, such as alkali metal silicates, e.g. sodium silicate, potassium silicate or lithium silicate. According to one embodiments the molar ratio dioxide to amnia to M 2Oh, where M is an alkali metal, is from about 4 to about 20, for example, from about 5 to about 15, such as from about 6 to about 11.

According to one of embodiments a suitable silane compounds, which must be mixed to particles of colloidal silica include epoxysilane and silane compounds containing glycidate or glycidoxypropyl group; Tris(trimetoksi)silane, octyltriethoxysilane, methyltriethoxysilane, methyltrimethoxysilane, isolatoren, such as Tris-[3-(trimethoxysilyl)propyl]isocyanurate; gamma mercaptopropionylglycine, bis-(3-[triethoxysilyl]propyl)polysulfide, beta-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; silanes containing apachegroup (epoxysilane), glycinate and/or glycidoxypropyl group, such as gamma glycidoxypropyltrimethoxysilane, gamma glycidoxypropyltrimethoxysilane, (3-glycidoxypropyl)trimethoxysilane, (3-glycidoxypropyl)hexyltrimethoxysilane, beta-(3,4-epoxycyclohexyl)ethyltriethoxysilane; silanes containing the vinyl group, such as vinyltriethoxysilane, VINYLTRIMETHOXYSILANE, vinyl-Tris-(2-methoxyethoxy)silane, wikimediamessages, vinyltriethoxysilane; gamma methacryloxypropyltrimethoxysilane, gamma methacryloxypropyltrimethoxysilane, gamma-metac roxypalacecasino, octyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, phenyltrimethoxysilane, 3-mercaptopropionyl, cyclohexyltrichlorosilane, cyclohexyltrichlorosilane, dimethyldiethoxysilane, 3-chloropropionitrile, 3-methacryloxypropyltrimethoxysilane, isobutyltrimethoxysilane, trimethylaluminium, phenyldimethylchlorosilane, hexamethyldisiloxane, trimethylsilane, vinyltriethoxysilane, hexamethyldisilazane and mixtures thereof. In U.S. patent 4927749 proposed additional suitable silanes that can be used in this invention.

According to one of embodiments at least about 1% of the number of surface silanol groups on the particles of the colloidal silicon dioxide is able to contact or connect with wilanowie groups of the silane compounds, for example, at least about 5%, or at least about 10%, or at least about 30%, or at least about 50% associated or connected with a silanol group.

According to one embodiments the silane compound before mixing with particles of colloidal silica diluted with, for example, water for the formation of a premix of silane and water, respectively, in a mass ratio of silane to water from about 1:8 to about 8:1, or from about 3:1 to about 1:3, such as from the example is about a 1.5:1 to about 1:1,5. Get the Silano-aqueous solution essentially transparent and stable and is easily mixed with particles of colloidal silicon dioxide. With continuous addition of silane to the particles of colloidal silicon dioxide mixing can be continued for from about 1 second to about 30 minutes, or from about 1 to about 10 minutes after the termination of addition of the silane.

According to one embodiments the pigment is inorganic. According to one of embodiments of the inorganic pigment is selected from calcium carbonate, barium sulfate, iron oxide(II, III), for example, Fe3O4a-Fe2O3, hydroxide iron oxide(III), for example, a-FeOOH, chromium oxide(III), compounds of cobalt, such as cobalt aluminate, zinc oxide, zinc sulfide, basic lead sulfate, basic lead carbonate, antimony oxide, lithopone, titanium oxide, for example, TiO2in the form of rutile or anatase, or mixtures thereof. According to one embodiments, the pigment may also be a clay, such as kaolin, or the filler material with the properties of the pigment, such as fume silica, Microbiocide silica, precipitated silica or silica gels.

According to one embodiments the pigment has a particle size in the range of from about 10 to about 5,000, for example, the t of about 100 to about 1000, or from about 100 to about 500, or from about 200 to about 400 nm.

According to one embodiments, the pigment is mixed with particles silanizing colloidal silicon dioxide in a weight ratio of silicon dioxide to the pigment is in the range of from about 0.01 to about 0.7, for example, from about 0.01 to about 0.6, or from about 0.01 to about 0.5, or from about 0.01 to about 0.4, or from about 0.01 to about 0.3, or from about 0.01 to about 0.2, or from about 0.02 to about 0.05 in.

According to one of embodiments for mixing pigment particles silanizing colloidal silicon dioxide using a mixer, for example, a turbine mixer at 1400 rpm./minutes mixing Time can be from about 1 to about 40, for example, from about 5 to 30, or, for example, from about 10 to 20 minutes. The temperature of mixing may be equal to from about 1 to about 80, for example, from about 10 to about 60, or from about 20 to about 40°C. According to one of embodiments radial velocity ranges from about 1 to 50, for example, from about 5 to about 35, for example, from about 15 to about 25 m/sec.

Pigments TiO2being one of the following pigments can usually be a rutile or anatase obtained either chloride or sulfate way. According to one is the variant of implementation of the use of particles of rutile TiO 2obtained by chloride method, with a particle size in the range of from about 100 to about 500 nm. According to one of embodiments of the particles of TiO2used to produce pigment TiO2can be a primary TiO2marked as particles of TiO2directly separated in the oxidation of TiCl4and before the final stages and/or before any surface treatment. In the sulphate method main TiO2refers to particles of TiO2before processing any surface. Alternatively, particles of TiO2used to produce pigment of the present invention, may represent a particle end-TiO2denoted here as particles of TiO2subjected to the usual final stages and/or the surface-treated water oxides such as aluminum oxide, silicon dioxide, zirconium dioxide or the like, or combinations of these substances. Water oxides can be up to about 16, for example, up to about 10 wt.% from the total mass of the product, pigment TiO2.

The invention also relates to a water dispersion of the pigment obtained as described below.

The invention also relates to a water dispersion of pigment, essentially free of organic binder and containing particles silanizing colloidal dioc the IDA silica mass ratio of silane to silicon dioxide from about 0.2 to about 1.5 and organic and/or inorganic pigment, in which the mass ratio of silicon dioxide to pigment is from about 0.001 to about 0.8.

According to one of the embodiments in the obtained water dispersion of the pigment may contain up to about 20, for example, up to about 10, or up to about 5 vol.% water-soluble or dispersible in water, an organic solvent, e.g. a lower alcohol. This dispersion may be formed of an aqueous dispersion containing some organic solvent, for example, a colloidal solution of silicic acid, silane compounds, or pigment, at least partially dispersed in an organic solvent or the environment.

According to one embodiments the pigment is inorganic. According to one of embodiments pigment mixed in such quantities to get the content of the pigment in the formed dispersion of the pigment is from about 25 to about 85, for example, from about 50 to about 80, or from about 60 to about 75 wt.%. According to one embodiments, the mass ratio of silicon dioxide to the pigment in the obtained dispersion of the pigment ranges from about 0.01 to about 0.7, for example, from about 0.01 to about 0.6, or from about 0.01 to about 0.5, or from about 0.01 to about 0.4, or from about 0.01 to about 0.3, or from about 0.01 to d is approximately 0.2, or from approximately 0.02 to approximately 0.05.

The total content of silicon dioxide in the resulting dispersion of the pigment consists of silicon dioxide present in the particles of the modified silanizing silicon dioxide and unmodified particles of silicon dioxide, which may also be present in the resulting dispersion. The total number of connections silane calculated based on all the freely dispersed or dissolved compounds of silane and all connections silane, connected or linked via a group or silane derivatives. Thus, the mass ratio of silane to silica in the obtained dispersion of the pigment, including both free and bound or United group can represent the mass ratio of the mixed components of silane and silicon dioxide, from about 0.25 to about 1.5, for example, from about 0.3 to about 1.2, or from about 0.35 to about 0.8, or from about 0.4 to about 0.8.

According to one of embodiments aqueous dispersion of a pigment consists of freely dispersed silane compounds and/or particles of colloidal silica and particles silanizing colloidal silicon dioxide, obtained from particles of colloidal silica and silane compounds, as here suggested.

According to one of the options is sushestvennee aqueous dispersion of pigment contains any inorganic pigments, as suggested here. Additional properties of the components contained in the water dispersion of pigment, can be described in methods.

The stability of the dispersion of the pigment makes the handling easy and its application when it is any use, because it is suitable for storage and does not require preparation immediately before use. Thus, it can easily be used already cooked dispersion. The variance is also advantageous in the sense of lack of dangerous quantities of toxic components.

Along with particles silanizing colloidal silica dispersion may also contain, at least to some extent, particles asianizing colloidal silicon dioxide, depending on the particle size of silicon dioxide, mass relationship of silane to silicon dioxide, the type of mixed silane compounds, reaction conditions, etc. Respectively, were silanediol at least about 40 wt.% particles of colloidal silicon dioxide, for example at least about 65, or at least about 90 or at least 95, for example, at least about 99 wt.%. The dispersion along with the silane in the form Milanovich groups or silane derivatives associated with or attached to the surface of particles of silicon dioxide, may also contain at least some step is neither freely dispersed unbound silane compounds. Accordingly, with the surface of the particles of silicon dioxide was connected or associated at least about 40, for example, at least about 60, or at least about 75, such as, for example, at least about 90, or at least about 95% of the silane compounds.

According to one of embodiments of the obtained dispersion of the pigment may have a silicon dioxide content of from about 1 to about 80, for example, from about 5 to about 80, or from about 10 to about 80, such as from about 20 to about 80, for example, from about 25 to about 70, or from about 30 to about 60 wt.%.

The resulting pigment dispersion suitable for use in coatings, including architectural coatings, paints for internal and external use, mordant agent, industrial coatings, such as collating, paper coatings, and protective coatings, or in other applications, including paper production, the manufacture of laminates and composite materials, such as paper, plastics, rubber, concrete and cementitious systems, printing inks and ceramics, such as ceramic tiles. The dispersion of the pigment can also be used on painted or non-absorbent substrates, such as glass fiber Wallpaper, to reduce or prevent the formation of the bubble the Cove, for example, plaster or putty.

The invention is described in such a way that it can vary in many ways. The following additional examples illustrate how the described invention can be implemented without limiting its scope.

All parts and percentages are parts and percentages by weight unless otherwise specified.

Examples

Used a colloidal solution of silicic acid had a silicon dioxide content of 13.4 wt.%, with the exception of examples 11 and 12, for which the content of silicon dioxide prior to use as a dispersant of the pigment was 4,46 wt.%, if not otherwise stated. Particles of colloidal silica in the ash modified gamma glycidoxypropyltrimethoxysilane. The modification with silane was carried out at 60°C, as described in patent application WO 2004/035474 A1. Various dispersion of colloidal silica used in this assessment is summarised in table 1 below, which also includes polyacrylate, used as a reference to the prior art.

1
Table 1
No.A colloidal solution of silicic acid (particle size and the degree of modification with silane)
5 nm, the silane/SiO2:0,4
25 nm, the silane/SiO2:0,2
34 nm, the silane/SiO2:0,2
44 nm, the silane/SiO2:0,4
55 nm, without silane
67 nm, without silane modified with aluminate
77 nm, the silane/SiO2:0,2
812 nm, without silane
912 nm, the silane/SiO2:0,15
10Polyacrylate (Dispex 40N), 0.4 wt.%
115 nm, the silane/SiO2:0,4
125 nm, the silane/SiO2:0,4
135 nm, the silane/SiO2:0,4

Obtaining pigment pastes

300 g of titanium dioxide (finely ground pigment titanium dioxide, Tiona 595 produced Univar) under moderate stirring was added over about 20 seconds to 100 g of the diluted colloidal solution of silicic to the slots according to table 1 and received 75 wt.%-percent pigment paste, unless otherwise stated (see table 2). Pigments were dispersively for 10 minutes at 1400 rpm./min solvent turbine with a diameter of 40 mm, obtaining well-dispersed pigments. Non pastes correspond to the number of colloidal solution of silicic acid in table 1, was used as the dispersant.

Table 2
Pigment paste No.Notes
1Stable viscosity constant (in 9 days)
2First, a bit more viscous than No. 1. After 1 day: very viscous, thixotropic
3First, more viscous than No. 2. After about 1 hour, not liquid. After 1 day: solid
4First, a bit more viscous than No. 1. After 1 day: viscous, thixotropic
5First the gel (after 8 minutes of dispersion)
6First the gel (after 1 minute dispersion)
7Pasta becomes firmly settled after addition of 260-270 g TiO 2
8First the gel (after addition of TiO2to the dispersion)
9First gel. Pasta becomes solid after addition of 220 g TiO2
10Thixotropic behavior after 1 day, still liquid after 9 days, although the phases are separated; the water from above
11First, a bit viscous, less than No. 1, but becomes thixotropic after 3 h
12In the paste 350 g TiO2. The gel after 15 minutes. Pasta flatwire after adding the binder.
13Dispersion for 20 minutes at 2000 rpm./minutes Stable, constant viscosity (after 6 days)

A series of coatings

The paste was injected into the emulsion resin with the formation of opaque compositions for optical evaluation. Used emulsion resin was Setalux®6774 supplied by Nuplex Resins. Received coverts composition contained 5, 10, 20, 30, 40 and 50 wt.% pigment titanium dioxide, respectively, in the dried opaque compositions. Films were cast using a film applicator with words 100 microns. Each opaque composition contained 50 g emulsi the resin (equal to 22 g of dry resin).

Evaluation of films

Optical measurements were carried out in the wavelength range of visible light (300-700 nm). The reflection coefficient pigmented coatings was measured by a spectrophotometer Beckman Acta 5240, equipped with an integrating sphere using barium sulfate as a reference reflection coefficient. Estimated coverts compositions based on pigment pastes 1-4, 10, 11, and 13. Pigment paste 5, 6, 8, 9, and 12, as can be seen from table 2, heliroute slice through a short period of time, whereas the paste 7 becomes solid after addition of 260-270 g TiO2. In this connection it may be noted that none of the pastes 5, 6, or 8 does not contain particles silanizing colloidal silicon dioxide and that the mass ratio of silane to silicon dioxide in 7 and 9 is only 0.2 and 0.15, respectively. In contrast, the paste No. 12 contains pasta excessive amount of pigment, that is, 350 g of TiO2.

The stability of the pigment paste

A high degree of modification with silane, colloidal silicon dioxide improves the stability compared with a low degree of modification; cf., for example, No. 1(high), No. 2 (low), No. 3 (low) and 4 (high) in table 2. "Comparative" paste No. 10, which is used Dispex N40, polyacrylate as a dispersant, tends to settling and separation of the paste.

Covering songs/u>

Opaque compositions were tested after 7.5 months. All samples were divided. Pigment TiO2sinking to the bottom of the sample. However coverts series No. 1, 4 and 13 were lecoregopenkey, whereas coverts series No. 3, 10 (comparative) and 11 had a much larger "cake" at the bottom of the sample.

The efficiency of light scattering pigment

The discussion in this section focuses on scattering as the integrated reflectance of the visible (light) (the wavelength interval λ: 300-700 nm) dispersion of colloidal silica versus conventional polyacrylate dispersant, Dispex N40. You could get a large increase in the efficiency of the pigment in the use of dispersions of colloidal silicon dioxide instead of Dispex N40 as a dispersant of the pigment at the recommended dosage of 0.40 wt.%; cf series No. 1 (containing a colloidal solution of silicic acid No. 1) and 10 (containing Dispex N40, as shown in table 1) in table 3 below. The most obvious effect was obtained at a high loading of pigment; for example, the content of titanium dioxide 30%dispersed colloidal silicon dioxide, has the same reflectance in the opaque film, and that about 40% of titanium dioxide, dispersed Dispex N40.

Table 3
With the model No. of the visible (light) (%) 110
Wt.% TiO2
538,5531,18
1047,6441,99
2059,2053,42
3061,1358,27
4069,5261,34
5067,4463,66

A particle size of

In terms of the reflection coefficient of a particle size of 5 nm, the corresponding specific surface area of 500 m2/g was more effective than a particle size of 4 nm, corresponding to a specific surface area of 750 m2/g (cf series coating 1 and 4 in table 4).

Table 4
Series, No.14
Wt.% TiO2 The reflection of the visible (light)(%)The reflection of the visible (light)(%)
538,5534,78
1047,6435,06
2059,2057,97
3061,1361,94
4069,5264,44
5067,4442,90

The degree of modification with silane dispersion of colloidal silicon dioxide

A high degree of modification with silane, colloidal silicon dioxide was also favorable in the visible (part of) the spectrum (wavelengths of 300 to 700 nm), especially for particles of 5 nm. The reason for this phenomenon is likely depended on the increased wetting of the pigment and improved stability against flocculation and distribution of pigments of titanium oxide (cf coating series 1-4 in table 5, in which the colloidal solution of silicic acid 1-4 were mixed to obtain a dispersion in series 1-4, respectively), although the differences are not pronounced the La last series of coatings.

Table 5
Series, No.1 Reflection of the visible (light)(%)2 the Reflection of the visible (light)(%)3 the Reflection of the visible (light)(%)4 the Reflection of the visible (light)(%)
Wt.% TiO2
538,5524,7917,6934,78
1047,6442,1034,8435,06
2059,2054,5252,7257,97
3061,1362,4862,5661,94
4069,5262,7564,87 64,44
5067,4463,7463,1742,90

1. The method of obtaining essentially aqueous dispersion of pigment, essentially free of organic binder comprising a mixture of at least one water-soluble or dispersible in water, silane compounds and particles of colloidal silica with particle formation silanizing colloidal silica in the aqueous dispersion, and the specified at least one silane compound is mixed with particles of colloidal silicon dioxide in a weight ratio of silane to silicon dioxide from 0.25 to 1.5; mixing of these particles silanizing colloidal silicon dioxide with organic and/or inorganic pigment, at mass ratio of silicon dioxide to pigment is from about 0.001 to about to 0.8, with the formation of this essentially aqueous dispersion of pigment.

2. The method according to claim 1, wherein the pigment has a particle size in the range of from about 10 to about 5000 nm.

3. The method according to claim 1, in which the content of the pigment in the dispersion is from about 25 to about 85 wt.%.

4. The method according to claim 1, wherein the pigment is a TiO2.

5. The method according to claim 1, wherein the mass ratio dioxide Kramnik the pigment is in the range from about 0.01 to about 0.4.

6. The method according to claim 1, wherein the mass ratio of silane to silica is from about 0.3 to about 1.5.

7. The method according to claim 1 in which the aqueous dispersion contains up to 20% by volume water soluble or dispersable in water, organic solvent.

8. The method according to claim 1, in which the addition of an organic binder such that the resulting dispersion contains fewer than about 1 wt.%.

9. Aqueous dispersion of the pigment obtained according to any one of claims 1 to 8.

10. Aqueous dispersion of a pigment, essentially free of organic binder containing particles silanizing colloidal silicon dioxide, in which the mass ratio of silane to silica in the dispersion of the pigment is from 0.25 to 1.5; and organic and/or inorganic pigment, in which the mass ratio of silicon dioxide to pigment is from about 0.001 to about 0.8.

11. The dispersion according to claim 9 or 10, in which the pigment has a particle size in the range of from about 10 to about 5000 nm.

12. The dispersion according to claim 9 or 10, in which the mass ratio of silane to silica is from about 0.3 to about 1.5.

13. The dispersion according to claim 9 or 10, in which the mass ratio of silicon dioxide to pigment is from about 0.01 to about 0.4.

14. The dispersion according to claim 9 or 10, in which the silicon dioxide content in the dispersion is from p is kerno 1 to about 80 wt.%.

15. The dispersion according to claim 9 or 10, in which the content of the pigment in the dispersion is from about 25 to about 85 wt.%.

16. The dispersion according to claim 9 or 10, in which the pigment is inorganic.

17. The dispersion according to claim 9 or 10, in which the pigment is a TiO2.

18. The dispersion according to claim 9 or 10, in which the dispersion is characterized by a content of less than about 1 wt.% organic binder.

19. The use of a dispersion according to any one of p-18, in which the dispersion is used for coating.

20. The use of a dispersion according to any one of p-18, in which the variance is used to reduce the formation of bubbles.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: described are novel benzotriazole UV-absorbers, having absorption spectrum shifted towards the long-wave side with considerable absorption in the region up to 410-420 nm, having general formulae (a)-(k) (structural formula and values of radicals are given in the description), composition which is stabilised with respect to UV radiation and containing novel UV-absorbers, and use of the novel compounds as UV light stabilisers for organic materials.

EFFECT: obtaining novel benzotriazole UV-absorbers, having absorption spectrum shifted towards the long-wave side.

13 cl, 23 ex, 2 tbl

FIELD: chemistry.

SUBSTANCE: coating composition has a latex component and a volatile coalescing solvent substituting agent. The agent has the formula: X(AO)nH, where X is a group from C6 to C16, selected from a group of linear chains, branched chains, aromatic rings and combinations thereof, AO is an alkyleneoxy group selected from ethyleneoxy groups, 1,2-propyleneoxy groups, 1,2-butyleneoxy groups and combinations thereof, and n varies from 3 to 14. The coating composition has content of volatile organic compounds less than or equal to 150 g/l. The volatile coalescing solvent substituting agent has little or no contribution into the total level of the volatile organic compounds in the coating composition.

EFFECT: obtaining a coating composition with high continuity and restorability, suitable low-temperature coalescence, resistance to adhesion and operational parameters in freezing and thawing conditions.

25 cl, 11 tbl

FIELD: chemistry.

SUBSTANCE: electroplating composition contains cyclic guanidine and a polymer which contains a functional group. Said polymer contains a functional group which reacts with said cyclic guanidine and said functional group includes an epoxy group. In the composition, said polymer with cyclic guanidine forms a reaction product. Said cyclic guanidine is 1,5,7-triazabicyclo[4.4.0]dec-5-ene. Use of cyclic guanidine in said composition can cut and/or completely eliminate the need for metallic catalysts such as tin and/or bismuth.

EFFECT: invention enables to form a coating which endows a substrate with corrosion resistance, wear resistance, resistance to damages caused by impact, fire resistance and heat resistance, chemical resistance, resistance to UV light and structural integrity.

67 cl, 33 ex

FIELD: chemistry.

SUBSTANCE: acrylic lacquer contains an acrylic copolymer dispersion Primal AC-4800ER, a coalescent additive Nexcoat NX-795, a wax additive Aquacer 502, Orotan 681 dispersant, a polyurethane thickener Acrisol RM-2020, a neutraliser - 20% aqueous ammonia solution, an antifoaming agent Nopko NXZ, a preservative Kathon LXE and water.

EFFECT: with the given combination of components, the acrylic lacquer is characterised by good working characteristics and forms a high-lustre transparent coating on wooden articles.

2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: the invention relates to compositions for coating suitable for coating a metal base (preferably a steel one), which will be installed and coated with external cover. The composition contains zinc powder and/or zinc alloy powder and colloid solution of modified silicone dioxide. The colloid solution of modified silicone dioxide contains colloid silicone dioxide particles, modified 6-40% mass of one or several silaned compositions and colloid particles of silicone dioxide. The composition is produced by adding the silaned composition or compositions to colloid solution of the silicone dioxide at the rate below 20 silane molecules per 1 nm2 of the silicon dioxide colloid particle surface per hour.

EFFECT: production of coating composition with considerable durability, good resistance to white rust and good film properties.

13 cl, 4 tbl, 1ex

FIELD: chemistry.

SUBSTANCE: nanosized silicon with particle size of 5-100 nm is added as a light stabiliser to the recipe of the composition during mixture or synthesis of ingredients thereof. In the surface layer, particles contain silicon dioxide in amount of 0.25-2.5 wt %, having stable spectral absorption of medium-wave UV radiation in the 200-420 nm range. This effect is retained at high temperatures of approximately up to 650 K.

EFFECT: obtaining coatings which do not change colour and operational properties and retain colour- and weather resistance.

2 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: coated film has a carrier film selected from a group comprising polyethylene terephthalate, glycol ester (PET-G), nylon, biaxially oriented polypropylene, oriented polypropylene, cast polypropylene, polystyrene, polyethylene, polyvinyl chloride, polylactic acid (PLA), polyhydroxy alkanoate (PHA), polyvinyl chloride and paper; and a coating on at least one surface of the carrier film, containing (a) vermiculite; (b) a polymer capable of forming a film, selected from polyhydroxyl polymer and urethane-containing polymer; (c) a vermiculite dispersant in the polymer, wherein said dispersant bears a negative charge; and (d) a cross-linking agent. The invention also relates to a method of stabilising a suspension containing vermiculite from a shearing action, involving merging a mixture containing one or more cross-linking agents, a polymer capable of forming a film, water and a vermiculite dispersant bearing a negative charge.

EFFECT: improved barrier properties.

24 cl, 3 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: composition contains: (a) a film-forming polymer with reactive functional groups; (b) a curing a curing agent with functional groups which react with groups from (a) and (c) an adhesion promoter. The adhesion promoter is obtained from (i) boric acid or boron-containing compounds which are hydrolysed to boric acid, and (ii) an ester with two or more terminal hydroxyl groups. The adhesion promoter is present in an amount which is sufficient to obtain boron content of 0.001-5 wt %. The ester is obtained via condensation of polybasic carboxylic acids and polybasic alcohols, some of which are 1,3-polyol. The ratio of boric acid equivalents or equivalent thereof and hydroxyl is greater than 0.1:1, and the ratio of equivalents of 1,3-polyol and carboxylic acid is greater than 2:1. A multilayer composite is obtained from the heat-curable composition. The composite has a first polymer layer formed on a substrate and a second polymer layer formed on top of the first layer.

EFFECT: invention enables to obtain multilayer composite coatings with improved interlayer adhesion.

31 cl, 6 tbl, 40 ex

FIELD: chemistry.

SUBSTANCE: costing is obtained from a composition containing a film-forming resin and a plurality of particles dispersed in the resin. The average size of the particles ranges from 0.1 to 50 mcm. The particles have hardness which is sufficient to endow the coating with high resistance to dents and/or scratches compared to a coating in which such particles are not present. Also, the difference between the refraction index of the resin and the refraction coefficient of the particles ranges from 1 to 1.5. The invention also describes a method of preparing a powdered coating which includes particles dispersed in the resin and a coated substrate.

EFFECT: after hardening, the coatings have high resistance to dents and scratches, high resistance to breaking caused by mechanical impacts, as a result of mechanical or chemical wear.

19 cl, 9 ex, 2 tbl

FIELD: chemistry.

SUBSTANCE: substrate is nonwoven material and the method involves steps for applying a composition in form of an aqueous suspension onto at least one side of the substrate. The composition contains silane, an initiator and an inorganic compound and the initiator is an aqueous acid or base, and the inorganic compound contains at least one metal and/or semimetal. The composition is then dried first at room temperature and then at 200°C after 10 seconds. Further, at least one coating composition is applied onto at least one side of the substrate on which the composition was already applied during the previous step. The coating composition contains silane of general formula (Z1)Si(OR)3, where Z1 denotes R, OR or Gly (Gly=3- glycidyloxypropyl) and R denotes an alkyl having 1-18 carbon atoms and all R can be identical or different, oxide particles selected from oxides of Ti, Si, Zr, Al, Y, Sn, Zn, Ce or mixtures thereof, epoxy resins and an aqueous acid or base as the initiator. The coating composition is dried for 30 minutes at 120°C.

EFFECT: very high flexibility of coated substrates without destroying or cracking the applied coating.

15 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to radiation-curable compositions, as well as a coating containing said composition for protecting metal substrates from corrosion. The composition consists of radiation-curable urethane(meth)acrylate with OH number ≥ 10 mg KOH/g, a monofunctional, radiation-curable reactive diluent, an acidic adhesion promoter, a photoinitiator, a multifunctional reactive diluent, radiation-curable resins and other inert additives. The adhesion booster used is phosphoric or phosphonic acid or products of their conversion with functionalised acrylates.

EFFECT: radiation-curable compositions, having good corrosion-protective properties for metal substrates, which are elastic and capable of being well moulded.

15 cl, 2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a metal substrate coated, at least partially, with a coating in form of a multilayer composite comprising at least one layer selected from an electrodeposited coating layer, a base coating layer and a transparent coating layer; and a coating containing polyurea obtained from a reaction mixture containing isocyanate and a product of reaction between a monoamine and poly(meth)acrylate, which is (meth)acrylated amine, in which the ratio of isocyanate group equivalents to amine group equivalents is greater than 1.3:1, and isocyanate and the reaction product, which is (meth)acrylated amine, can be deposited on the substrate in volume ratio of concentration of components of 1:1. The invention also describes a building having a structural element coated, at least partially, with a coating from said polyurea, as well as a substrate coated, at least partially, with a coating from said polyurea, where the ratio of isocyanate equivalents to amine group equivalents is greater than 1.3:1.

EFFECT: coating can attenuate an explosion, eg, protection in case of an explosion or breakage in the immediate vicinity of flying debri formed by an explosion wave.

21 cl, 3 tbl

Coating composition // 2452756

FIELD: chemistry.

SUBSTANCE: composition contains oligobutadiene diol, glycerine, mineral filler, polyisocyanate, organotin catalyst, 2,4,6-tri-tertbutylphenol, ethyl silicate, polysulphide oligomer, zinc oxide, a surfactant and a modifier - prepolymer with terminal polyfluoroalkyl-oligo-ε-caproamide groups.

EFFECT: high sedimentation resistance and processability of the composition, as well as improved dynamic and physical-mechanical properties of the coating.

2 tbl

Coating composition // 2452755

FIELD: chemistry.

SUBSTANCE: coating composition contains oligobutadiene diol, glycerine, mineral filler, polyisocyanate, an organotin catalyst, 2,4,6-tri-tert-butylphenol, ethyl silicate, polysulphide oligomer, zinc oxide, diatomite, a modifying additive - 1',1',11,'-trihydroperfluoroundecaneoxy-(2"-hydroxy ethyl)-oligo-2-methyl-1-oxylidene of formula

EFFECT: high sedimentation resistance of the composition, dynamic and physical-mechanical, adhesion properties of the coating.

2 tbl

Coating composition // 2452754

FIELD: chemistry.

SUBSTANCE: coating composition contains: oligobutadiene diol, glycerine, mineral filler, polyisocyanate, an organotin catalyst, 2,4,6-tri-tert-butylphenol, ethyl silicate, polysulphide oligomer, zinc oxide, diatomite, a modifying additive - 1H,1H-perfluoroheptoxy methyloxirane of formula

EFFECT: high sedimentation resistance of the composition, dynamic and physical-mechanical, adhesion properties of the coating.

2 tbl

Coating composition // 2452753

FIELD: chemistry.

SUBSTANCE: composition contains oligobutadiene diol, glycerine, mineral filler, polyisocyanate, an organotin catalyst, 2,4,6-tri-tert-butylphenol, ethyl silicate, polysulphide oligomer, zinc oxide, diatomite, a modifying additive - 1H,1H,7H-perfluoroheptoxy methyloxirane of formula .

EFFECT: high sedimentation resistance of the composition, dynamic and physical-mechanical, adhesion properties of the coating.

2 tbl

Urethane putty // 2451703

FIELD: chemistry.

SUBSTANCE: invention relates to chemistry, particularly quick-setting polyurethane compositions and can be used in construction to seal joints between enclosing structures of buildings and control joints of concrete floors, slits and cracks. The urethane putty contains a component A as the basic paste, which contains a hydroxyl-containing polyether with molecular weight 3600, silicon dioxide, diethylene glycol, a cationic catalyst, a plasticiser containing dibutylphthalate and chloroparaffin, filler, and a component B as the putty hardener, which is obtained by reacting the hydroxyl-containing polyether - laprol 3603-2-12 with toluylene diisocyanate and further contains a stabiliser, wherein before application, components A and B are mixed with each other in ratio 9:1 pts.wt, respectively.

EFFECT: broader processing capability of urethane putty in construction of buildings.

4 cl

FIELD: chemistry.

SUBSTANCE: composition for sports flooring contains oligobutadiene diol, a plasticiser, mineral filler in form of calcite which is first modified with a polyfluorinated alcohol in weight ratio 1:1, at temperature 70°C, ultrasound frequency 40 kHz for 90 minutes, a tri-functional low-molecular weight alcohol, polymethylene polyphenylene polyisocyanate with content of isocyanate groups of 29.5-31.0%, an organotin catalyst, 2,4,6-tri-tertbutylphenol, and a modifier - mono(1,1,7-trihydroperfluoroheptyl) phthalic ester.

EFFECT: improved dynamic and physical-mechanical properties, as well as resistance to thermal-oxidative and light ageing.

2 tbl

FIELD: chemistry.

SUBSTANCE: composition for working coating of a conveyor belt contains a urethane prepolymer SKU-PFL, an amine hardener, an organic solvent, titanium dioxide and polyethyl siloxane.

EFFECT: high quality of the working coating of the conveyor belt, avoiding craters and pores on the coating surface.

1 dwg, 3 tbl

FIELD: chemistry.

SUBSTANCE: composition contains oligobutane diol, a plasticiser, mineral filler, tri-functional low-molecular weight alcohol, polymethylene polyphenylene polyisocyanate with content of isocyanate groups of 29.5-31.0%, an organotin catalyst, 2,4,6-tri-tert-butylphenol, a modifier 2,3-dihydroxypropyl-6-(1,1,11-trihydroperfluoroundecylamino)hexanoate. The modifier is first obtained by reacting equimolar amounts of mono-ε-aminocaproate glycerine and 1,1,11-trihydroperfluoroundecanol-1 in a vacuum-sealed ampoule at temperature 180°C for 90 minutes.

EFFECT: improved dynamic and physical-mechanical properties, as well as resistance to thermal-oxidative and light ageing.

2 tbl

FIELD: nanotechnologies.

SUBSTANCE: invention relates to modified nanoparticles on the basis of pyrogenic silicon dioxide used in compositions for coatings, in particular, automobile and industrial ones. Modified nanoparticles are described, which contain pyrogenic silicon dioxide. Specified nanoparticles are produced by treatment of pyrogenic silicon dioxide with compound of formula (I) Me(OR1)4, in which R1 - lower alkyl, Me - titanium, in amount of 35-40% from weight of silicon dioxide. Composition for coating is also described, which includes specified modified nanoparticles.

EFFECT: invention provides for high-quality coating, which excels similar coating including non-modified pyrogenic silicon dioxide in gloss, opacity and resistance to scratching.

20 cl, 1 tbl, 2 ex

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