CN114634721A - Silicon-aluminum oxide coated titanium dioxide and preparation method and application thereof - Google Patents
Silicon-aluminum oxide coated titanium dioxide and preparation method and application thereof Download PDFInfo
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- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
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- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
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Abstract
The invention discloses silicon-aluminum oxide coated titanium dioxide and a preparation method and application thereof. The silicon-aluminum oxide coated titanium dioxide comprises a titanium dioxide inner core, a silicon dioxide middle coating layer and an aluminum oxide outer coating layer, and the preparation method comprises the following steps: 1) dispersing titanium dioxide and a dispersing agent in a solvent, adding tetraethoxysilane and a catalyst, and aging to obtain a reaction solution containing silicon dioxide coated titanium dioxide; 2) adding sodium metaaluminate and inorganic acid into the reaction liquid containing the silicon dioxide coated titanium dioxide, aging, and separating out a solid product to obtain the silicon-aluminum oxide coated titanium dioxide. The silicon-aluminum oxide coated titanium dioxide has low acid solubility and good dispersibility in a water-based ink system, and the water-based ink prepared by using the silicon-aluminum oxide coated titanium dioxide as a pigment has excellent whiteness and glossiness, and can be applied to the field of digital printing with high hygienic requirements.
Description
Technical Field
The invention relates to the technical field of inorganic pigments, in particular to silicon-aluminum oxide coated titanium dioxide and a preparation method and application thereof.
Background
The Water-based ink (Water-based ink) is called Water ink for short and is mainly prepared by carrying out compound grinding on Water-soluble resin, organic pigment, solvent and auxiliary agent. The water-based ink has the advantages of low VOC (volatile organic compounds) emission, non-flammability, non-explosion, non-corrosion to printing substrates and the like, and is widely applied to the printing fields (such as clothes, cigarettes, wines, toys, food and the like) with higher requirements on sanitation and quality.
Titanium dioxide (particularly rutile titanium dioxide) is an inorganic pigment commonly used in white water-based ink, and has the advantages of high whiteness and glossiness, stable physicochemical properties and the like. However, due to the existence of lattice defects, titanium dioxide has certain photocatalytic activity under ultraviolet irradiation, and can catalytically degrade matrix resin, so that the phenomena of chalking, yellowing and the like of a coating film can be caused. In addition, the dispersibility of titanium dioxide in a water-based ink system is poor, the glossiness of a coating film is seriously influenced, the problem that the water-based ink blocks a digital printing machine nozzle is easily caused, and the water-based ink is greatly limited to be used in occasions with high requirements on glossiness and fineness.
Therefore, the titanium dioxide product which can improve the weather resistance and the glossiness of the white water-based ink and is prepared by surface modification treatment has very important significance.
Disclosure of Invention
The invention aims to provide silicon-aluminum oxide coated titanium dioxide and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
a silicon-aluminum oxide coated titanium dioxide comprises a titanium dioxide inner core, a silicon dioxide middle coating layer and an aluminum oxide outer coating layer.
Preferably, the average particle size of the silicon-aluminum oxide coated titanium dioxide is 400nm to 450 nm.
Preferably, the titanium dioxide inner core is rutile type titanium dioxide with the average particle size of 100 nm-300 nm.
More preferably, the titanium dioxide core is rutile titanium dioxide having an average particle diameter of 150nm to 250 nm. When the average particle size is small, the specific surface area of the titanium dioxide particles is large, and the titanium dioxide particles are difficult to disperse in the coating process; when the average particle size is larger, the average particle size of the coated titanium dioxide can reach 500 nm-600 nm, and finally the glossiness of the water-based ink is seriously influenced.
The preparation method of the silicon-aluminum oxide coated titanium dioxide comprises the following steps:
1) dispersing titanium dioxide and a dispersing agent in a solvent, adding tetraethoxysilane and a catalyst, and aging to obtain a reaction solution containing silicon dioxide coated titanium dioxide;
2) adding sodium metaaluminate and inorganic acid into the reaction liquid containing the silicon dioxide coated titanium dioxide, aging, and separating out a solid product to obtain the silicon-aluminum oxide coated titanium dioxide.
Preferably, the preparation method of the silicon-aluminum oxide coated titanium dioxide comprises the following steps:
1) stirring and dispersing titanium dioxide and a dispersing agent in a solvent, then dropwise adding a dispersion liquid containing tetraethoxysilane and a catalyst, and aging after adding to obtain a reaction liquid containing silicon dioxide coated titanium dioxide;
2) and dropwise adding the dispersion liquid containing sodium metaaluminate and inorganic acid into the reaction liquid containing the silicon dioxide coated titanium dioxide, aging and centrifuging after adding, and washing and drying the solid obtained by centrifuging to obtain the silicon-aluminum oxide coated titanium dioxide.
Preferably, the ethyl orthosilicate in the step 1) is used in SiO2Calculated as 1 to 6 percent of the mass of the titanium dioxide.
Further preferably, the amount of the tetraethoxysilane in the step 1) is SiO2The mass of the titanium dioxide is 3 to 5 percent. When the using amount of the tetraethoxysilane is less, the tetraethoxysilane is difficult to completely coat the surface of the titanium dioxide, so that the acid solubility of the titanium dioxide is high, and the weather resistance of the water-based ink is poor; when the amount of ethyl orthosilicate is usedWhen the amount of the titanium dioxide is large, the tetraethoxysilane is more prone to homogeneous nucleation, and the silanol attached to the surface of the titanium dioxide is increased, so that the particle size of the generated titanium dioxide is large, and the glossiness of the water-based ink is influenced.
Preferably, the dispersant in step 1) is at least one selected from sodium hexametaphosphate, sodium dodecylbenzene sulfonate, polyvinyl alcohol, cetyl trimethyl ammonium bromide and triethanolamine.
Preferably, the stirring in step 1) is performed at a stirrer rotation speed of 300rpm to 600 rpm.
Preferably, the solvent in the step 1) is composed of ethanol and water according to a volume ratio of 2-7: 1.
Preferably, the solvent in the step 1) is composed of ethanol and water according to a volume ratio of 5-7: 1. When the proportion of water is large, the hydrolysis reaction of the tetraethoxysilane is fast, more monosilicic acid and ethanol can be generated, the silicon-oxygen bond can be hydrolyzed again, the system gel time is prolonged, and in addition, the increase of the particle size of the titanium dioxide can be caused due to the increase of the reaction speed; when the proportion of water is small, the tetraethoxysilane cannot ensure sufficient hydrolysis, the reaction is mainly dealcoholized and condensed, the hydrolysis process is limited, and a compact silicon dioxide coating layer is difficult to form.
Preferably, the concentration of the titanium dioxide in the solvent in the step 1) is 50 g/L-200 g/L.
More preferably, the concentration of the titanium dioxide in the solvent in the step 1) is 75g/L to 125 g/L. When the concentration is too low, the amount of titanium dioxide coated by silicon dioxide is small, so that the energy consumption cost performance and the preparation efficiency are low; when the concentration is too high, titanium dioxide particles are easily agglomerated in the reaction process, which is not favorable for the coating process of silicon dioxide, and also results in a larger average particle size of the produced titanium dioxide.
Preferably, the catalyst in step 1) is at least one selected from ammonia, sodium hydroxide and potassium hydroxide.
Preferably, the aging in step 1) is carried out at 30 ℃ to 80 ℃.
Further preferably, the aging in step 1) is carried out at 55 ℃ to 70 ℃. The tetraethoxysilane is hydrolyzed under the action of a catalyst to generate silanol, then is combined with hydroxyl on the surface of titanium dioxide particles under the kinetic driving action of heterogeneous nucleation, and finally is further subjected to polycondensation and dehydration to form a silicon dioxide coating layer.
Preferably, the aging time in the step 1) is 1-3 h. The aging has the effects of completely reacting the residual tetraethoxysilane in the reaction system, contributing to improving the deposition rate and coating compactness of the silicon dioxide, hardly realizing high-efficiency coating of the surface of the titanium dioxide when the aging time is too short, having poor compactness of the coating layer, and having small promotion amplitude of the compactness of the coating layer on the surface of the titanium dioxide, long preparation period and large energy consumption of the system when the aging time is too long.
Preferably, the amount of the sodium metaaluminate in the step 2) is Al2O3Calculated as 1 to 6 percent of the mass of the titanium dioxide.
Further preferably, the amount of sodium metaaluminate in step 2) is Al2O3Calculated as 2 to 4 percent of the mass of the titanium dioxide. On the basis of the titanium dioxide slurry coated with the silicon dioxide, the coating treatment of the aluminum oxide is continued, so that the compactness of the coating layer on the surface of the titanium dioxide can be further improved, and the white water-based ink has more excellent weather resistance.
Preferably, the inorganic acid in step 2) is at least one selected from sulfuric acid, nitric acid and hydrochloric acid.
Preferably, the aging of step 2) is carried out at a temperature of 40 ℃ to 90 ℃.
Preferably, the aging time in the step 2) is 0.5 h-3 h. The aging has the effect of completely reacting the residual sodium metaaluminate in the reaction system, which is beneficial to improving the deposition rate and coating compactness of the aluminum oxide, when the aging time is too short, the high-efficiency coating is difficult to realize, the compactness of the coating layer is poor, when the aging time is too long, the compactness of the coating layer is improved to a small extent, the preparation period is long, and the energy consumption of the system is large.
The water-based ink comprises the silicon-aluminum oxide coated titanium dioxide.
Preferably, the water-based ink comprises the following components in percentage by mass:
water-soluble resin: 10% -60%;
silicon-aluminum oxide coated titanium dioxide: 3% -20%;
auxiliary agent: 3% -7%;
ethanol: 1% -15%;
water: and (4) the balance.
Preferably, the water-soluble resin is at least one selected from water-soluble pure acrylic resin, water-soluble styrene-acrylic resin and water-soluble silicone-acrylic resin.
Preferably, the auxiliary agent is selected from at least one of defoaming agent, thickening agent, leveling agent, wetting agent and pH regulator.
The preparation method of the water-based ink comprises the following steps: mixing water-soluble resin, silicon-aluminum oxide coated titanium dioxide, an auxiliary agent, ethanol and water, stirring at a high speed for dispersion, grinding and filtering to obtain the water-based ink.
The invention has the beneficial effects that: the silicon-aluminum oxide coated titanium dioxide has low acid solubility and good dispersibility in a water-based ink system, and the water-based ink prepared by using the silicon-aluminum oxide coated titanium dioxide as a pigment has excellent whiteness and glossiness, and can be applied to the field of digital printing with high hygienic requirements.
Drawings
FIG. 1 is an XRD pattern of rutile titanium dioxide, the silica-alumina-coated titanium dioxide of example 1, and the silica-coated titanium dioxide of comparative example 1.
FIG. 2 is a graph showing the particle size distribution of rutile titanium dioxide, the silica-alumina-coated titanium dioxide of example 1, and the silica-coated titanium dioxide of comparative example 1.
Fig. 3 is a TEM image of rutile titanium dioxide.
Fig. 4 is a TEM image of the silicon aluminum oxide coated titanium dioxide of example 1.
Fig. 5 is a TEM image of the silica-coated titania of comparative example 1.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
a preparation method of silicon-aluminum oxide coated titanium dioxide comprises the following steps:
1) mixing 10g of rutile type titanium dioxide (with the average particle size of 243nm), 0.1g of sodium hexametaphosphate, 155.8mL of ethanol and 27.1mL of water, uniformly stirring, setting the rotation speed of a stirrer to be 500rpm, putting the stirrer in an oil bath at 60 ℃, adjusting the rotation speed of the stirrer to be 300rpm, simultaneously dropwise adding 20mL of ethyl orthosilicate ethanol solution with the concentration of 1.04g/mL and 8mL of ammonia water with the mass fraction of 25%, finishing the addition for 1h, and aging for 2h after the addition is finished to obtain a reaction solution containing silicon dioxide coated titanium dioxide;
2) simultaneously dripping 6.4mL of 50g/L sodium metaaluminate solution and 20g of 10% sulfuric acid solution in percentage by mass into a reaction solution containing silicon dioxide coated titanium dioxide in an oil bath at 60 ℃, aging for 1.5h after finishing adding, centrifuging, washing and drying solid obtained by centrifuging to obtain the silicon-aluminum oxide coated titanium dioxide.
Example 2:
a preparation method of silicon-aluminum oxide coated titanium dioxide comprises the following steps:
1) mixing 25g of rutile type titanium dioxide (with the average particle size of 243nm), 0.1g of sodium hexametaphosphate, 155.8mL of ethanol and 27.5mL of water, uniformly stirring, adjusting the rotation speed of the stirrer to be 500rpm, putting the stirrer in an oil bath at 60 ℃, adjusting the rotation speed of the stirrer to be 300rpm, simultaneously dropwise adding 20mL of 1.04g/mL ethyl orthosilicate ethanol solution and 8mL of 25 mass percent ammonia water for 1 hour, and aging for 2 hours after completing addition to obtain a reaction solution containing silicon dioxide coated titanium dioxide;
2) simultaneously dripping 6.4mL of 50g/L sodium metaaluminate solution and 20g of 10% sulfuric acid solution into a reaction solution containing silicon dioxide coated titanium dioxide in an oil bath at 60 ℃, finishing the addition for 1.5h, then aging for 1.5h, centrifuging, washing and drying the solid obtained by centrifuging to obtain the silicon-aluminum oxide coated titanium dioxide.
Example 3:
a preparation method of silicon-aluminum oxide coated titanium dioxide comprises the following steps:
1) mixing 10g of rutile type titanium dioxide (with the average particle size of 243nm), 0.1g of sodium hexametaphosphate, 155.8mL of ethanol and 27.1mL of water, uniformly stirring, adjusting the rotation speed of the stirrer to be 500rpm, putting the stirrer in an oil bath at 60 ℃, adjusting the rotation speed of the stirrer to be 300rpm, simultaneously dropwise adding 20mL of 1.04g/mL ethyl orthosilicate ethanol solution and 8mL of 25 mass percent ammonia water for 1 hour, and aging for 1 hour after completing addition to obtain a reaction solution containing silicon dioxide coated titanium dioxide;
2) simultaneously dripping 6.4mL of 50g/L sodium metaaluminate solution and 20g of 10% sulfuric acid solution into a reaction solution containing silicon dioxide coated titanium dioxide in an oil bath at 60 ℃, finishing the addition for 1.5h, then aging for 1.5h, centrifuging, washing and drying the solid obtained by centrifuging to obtain the silicon-aluminum oxide coated titanium dioxide.
Example 4:
a preparation method of silicon-aluminum oxide coated titanium dioxide comprises the following steps:
1) mixing 20g of rutile titanium dioxide (with the average particle size of 243nm), 0.1g of sodium hexametaphosphate, 155.8mL of ethanol and 27.1mL of water, uniformly stirring, setting the rotation speed of a stirrer to be 500rpm, putting the stirrer in an oil bath at 60 ℃, adjusting the rotation speed of the stirrer to be 300rpm, simultaneously dropwise adding 20mL of ethyl orthosilicate ethanol solution with the concentration of 1.04g/mL and 8mL of ammonia water with the mass fraction of 25%, finishing the addition for 1h, and aging for 2h after finishing the addition to obtain a reaction solution containing silicon dioxide coated titanium dioxide;
2) simultaneously dripping 6.4mL of 50g/L sodium metaaluminate solution and 20g of 10% sulfuric acid solution into a reaction solution containing silicon dioxide coated titanium dioxide in an oil bath at 60 ℃, finishing the addition for 1.5h, then aging for 1.5h, centrifuging, washing and drying the solid obtained by centrifuging to obtain the silicon-aluminum oxide coated titanium dioxide.
Comparative example 1:
a preparation method of silicon dioxide coated titanium dioxide comprises the following steps:
20g of rutile titanium dioxide (with the average particle size of 243nm), 0.1g of sodium hexametaphosphate, 146.9mL of ethanol and 17mL of water are mixed and stirred uniformly, the rotation speed of a stirrer is 500rpm, the mixture is placed in an oil bath at 60 ℃, the rotation speed of the stirrer is adjusted to 300rpm, 20mL of ethyl orthosilicate ethanol solution with the concentration of 1.04g/mL and 8mL of ammonia water with the mass fraction of 25% are added dropwise at the same time, the addition is finished for 1h, the mixture is aged for 2h after the addition is finished, and the mixture is centrifuged, and the solid obtained by centrifugation is washed and dried to obtain the silica-coated titanium dioxide.
Comparative example 2:
the preparation method of the sodium silicate-sodium metaaluminate coated titanium dioxide comprises the following steps:
1) adding 10g of rutile type titanium dioxide (with the average particle size of 243nm) and 0.05g of sodium hexametaphosphate into 200mL of water, uniformly stirring at the rotation speed of a stirrer of 500rpm, adding a 0.5mol/L sodium hydroxide solution to adjust the pH value to 10, heating to 90 ℃, simultaneously dropwise adding 12.2mL of a 50g/L sodium silicate solution and 4.1mL of a 10% sulfuric acid solution in mass fraction to keep the pH value of the system between 9.8 and 10.2, finishing adding 1 hour, and aging for 2 hours after finishing adding to obtain a reaction solution containing sodium silicate coated titanium dioxide;
2) adjusting the pH of a reaction solution containing sodium silicate-coated titanium dioxide to 7.0 by using a sulfuric acid solution with the mass fraction of 10%, simultaneously dropwise adding 6.2mL of 50g/L sodium metaaluminate solution and 1.3mL of 10% sulfuric acid solution to keep the pH of the system at about 7.0 all the time, finishing the addition for 1.5h, then aging for 1.5h, adjusting the pH to 7.0, continuing to age for 0.5h, centrifuging, taking the solid obtained by centrifuging, washing and drying to obtain the sodium silicate-sodium metaaluminate-coated titanium dioxide.
And (4) performance testing:
1) the X-ray diffraction (XRD) patterns of the rutile type titania, the silica-alumina-coated titania of example 1, and the silica-coated titania of comparative example 1 are shown in fig. 1.
As can be seen from fig. 1: the crystal face peak of silicon dioxide [100] exists at 20.4 degrees of the silicon dioxide coated titanium dioxide, while the difference of diffraction peaks does not appear between rutile type titanium dioxide and silicon-aluminum oxide coated titanium dioxide, which indicates that aluminum oxide is amorphous.
2) The particle size distribution diagrams of rutile titanium dioxide, the silicon-aluminum oxide-coated titanium dioxide of example 1, and the silicon dioxide-coated titanium dioxide of comparative example 1 are shown in fig. 2 (an aqueous solution of a sample to be measured having a concentration of 0.01g/L was prepared, and the particle size distribution thereof was measured by a laser particle size analyzer).
As can be seen from fig. 2: the rutile titanium dioxide has an average particle size of 243nm, the silicon-aluminum oxide-coated titanium dioxide has an average particle size of 426nm, and the silicon dioxide-coated titanium dioxide has an average particle size of 368 nm. Therefore, the average particle size of the silicon dioxide coated titanium dioxide is controlled to be less than 500nm, and the requirement of the water-based ink on the particle size of the titanium dioxide is met.
3) Transmission Electron Microscope (TEM) images of rutile titanium dioxide, the silicon-aluminum oxide-coated titanium dioxide of example 1, and the silica-coated titanium dioxide of comparative example 1 are shown in the order of FIGS. 3 to 5.
As can be seen from FIGS. 3 to 5: after the coating of the silicon dioxide and the coating of the aluminum oxide, the titanium dioxide particles are coated with a layer of amorphous silicon dioxide and aluminum oxide, the XRD shows that the particles may be homogeneous nucleated silicon dioxide, and meanwhile, the particles are connected by the silicon dioxide, so that the average particle size obtained by the test is larger.
4) The acid solubility, Zeta potential and whiteness and gloss of the white water-based ink prepared were measured for the silicon-aluminum oxide coated titanium dioxide of examples 1 to 4, the silicon dioxide coated titanium dioxide of comparative example 1 and the sodium silicate-sodium metaaluminate coated titanium dioxide of comparative example 2, and the results are shown in the following table:
TABLE 1 results of acid solubility, Zeta potential, whiteness and gloss measurements
Note:
acid solubility: adding 0.2000g of sample to be detected (accurate to 0.001g) into a round bottom flask with the volume of 50mL, adding 10mL of concentrated sulfuric acid with the mass fraction of 98%, installing a reflux condenser tube, placing the reflux condenser tube into an oil bath at 175 ℃, stirring and dissolving, taking out the mixture after 1h, placing the mixture into crushed ice for quenching, fully cooling, using distilled water to fix the volume to 100mL, centrifuging, measuring 5mL of supernatant into a 50mL colorimetric tube, adding 5mL of hydrogen peroxide solution with the mass fraction of 30%, using 10% of dilute sulfuric acid to fix the volume to a scale mark, using an ultraviolet spectrophotometer to measure the absorbance of the mixture at the wavelength of 410nm, then determining the concentration of titanium dioxide in the solution to be detected according to an absorbance standard curve of known titanium dioxide concentration, and finally calculating the acid solubility of the sample to be detected.
Zeta potential: preparing a sample aqueous solution to be measured with the concentration of 0.1g/L, and measuring the Zeta potential of the sample aqueous solution by adopting a dynamic light scattering instrument.
Whiteness degree: 35g of water-soluble acrylic resin (pure acrylic emulsion produced by Yixing market credible chemical industry Co., Ltd.), 35g of deionized water, 10g of absolute ethyl alcohol, 15g of sample to be tested and 5g of auxiliary agent (specifically: 1g of triethylamine, 1.2g of wetting agent, 1.2g of defoaming agent, 0.8g of preservative and 0.8g of flatting agent) are stirred and dispersed at high speed, then grinding and filtering are carried out to prepare white water-based ink, then the white water-based ink is uniformly coated on a glass substrate, natural drying is carried out, then the coating film is cut into the size required by a whiteness meter test, the whiteness value of the coating film is measured, each sample is measured in parallel for three times, and the average value is taken.
Gloss: 35g of water-soluble acrylic resin (pure acrylic emulsion produced by Yixing market credible chemical industry Co., Ltd.), 35g of deionized water, 10g of absolute ethyl alcohol, 15g of sample to be tested and 5g of auxiliary agent (specifically: 1g of triethylamine, 1.2g of wetting agent, 1.2g of defoaming agent, 0.8g of preservative and 0.8g of flatting agent) are stirred and dispersed at high speed, then grinding and filtering are carried out to prepare white water-based ink, then the white water-based ink is uniformly coated on a glass substrate, natural drying is carried out, and then a glossiness instrument is adopted to test the glossiness of a coating film in a 60-degree direction.
As can be seen from Table 1:
1) the acid solubility of the silicon-aluminum oxide coated titanium dioxide of the embodiments 1 to 4 is obviously lower than that of the silicon dioxide coated titanium dioxide of the comparative example 1, which shows that a relatively dense silicon dioxide coating layer and an aluminum oxide coating layer are formed on the surface of the titanium dioxide, so that the optical catalytic activity of the titanium dioxide can be reduced, and the weather resistance of the white water-based ink can be improved;
2) the acid solubility of the silicon-aluminum oxide coated titanium dioxide of the embodiments 1 to 4 is obviously lower than that of the sodium silicate-sodium metaaluminate coated titanium dioxide of the comparative example 2, which shows that the coating effect is better;
3) the Zeta potential test result shows that the silicon-aluminum oxide coated titanium dioxide of the embodiments 1-4 has good dispersibility;
4) the white water-based ink prepared from the silicon-aluminum oxide coated titanium dioxide of the embodiments 1 to 4 shows ideal whiteness and glossiness, and is suitable for popularization and application in the digital printing field with high requirements on sanitation and quality.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (10)
1. The silicon-aluminum oxide coated titanium dioxide is characterized by comprising a titanium dioxide inner core, a silicon dioxide middle coating layer and an aluminum oxide outer coating layer.
2. The silicon aluminum oxide-coated titanium dioxide of claim 1, wherein: the average grain diameter of the silicon-aluminum oxide coated titanium dioxide is 400 nm-450 nm.
3. The silicon aluminum oxide-coated titanium dioxide according to claim 1 or 2, wherein: the titanium dioxide inner core is rutile type titanium dioxide with the average grain diameter of 100 nm-300 nm.
4. The method for producing the silicon-aluminum oxide coated titanium dioxide according to any one of claims 1 to 3, characterized by comprising the steps of:
1) dispersing titanium dioxide and a dispersing agent in a solvent, adding tetraethoxysilane and a catalyst, and aging to obtain a reaction solution containing silicon dioxide coated titanium dioxide;
2) adding sodium metaaluminate and inorganic acid into the reaction liquid containing the silicon dioxide coated titanium dioxide, aging, and separating out a solid product to obtain the silicon-aluminum oxide coated titanium dioxide.
5. The method for producing silicon aluminum oxide-coated titanium dioxide according to claim 4, characterized in that: the dosage of the ethyl orthosilicate in the step 1) is SiO2Calculated as 1 to 6 percent of the mass of the titanium dioxide.
6. The method for producing silicon-aluminum oxide-coated titanium dioxide according to claim 4 or 5, characterized in that: the dispersant in the step 1) is at least one selected from sodium hexametaphosphate, sodium dodecyl benzene sulfonate, polyvinyl alcohol, cetyl trimethyl ammonium bromide and triethanolamine.
7. The method for producing silicon-aluminum oxide-coated titanium dioxide according to claim 4 or 5, characterized in that: the catalyst in the step 1) is at least one selected from ammonia water, sodium hydroxide and potassium hydroxide.
8. The method for producing silicon aluminum oxide-coated titanium dioxide according to claim 4, characterized in that: the dosage of the sodium metaaluminate in the step 2) is Al2O3Calculated as 1 to 6 percent of the mass of the titanium dioxide.
9. The method for producing silicon-aluminum oxide-coated titanium dioxide according to any one of claims 4, 5 and 8, characterized in that: and 2) selecting at least one of the inorganic acid from sulfuric acid, nitric acid and hydrochloric acid.
10. An aqueous ink comprising the silicon-aluminum oxide-coated titanium dioxide according to any one of claims 1 to 3.
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| CN106497147A (en) * | 2016-10-25 | 2017-03-15 | 锦州钛业有限公司 | A kind of preparation method with high covering power, high-weatherability and high whiteness TiO 2 pigment |
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| CA962142A (en) * | 1971-06-07 | 1975-02-04 | Canadian Titanium Pigments Limited | Ultra-violet screener |
| US3897261A (en) * | 1973-12-20 | 1975-07-29 | Du Pont | Hydrous oxide coated TiO{HD 2 {L |
| US6620233B1 (en) * | 1999-11-08 | 2003-09-16 | Basf Aktiengesellschaft | Goniochromatic luster pigments which are based on titanium dioxide-coated siliceous platelets heated in a reductive atmosphere |
| US20070003464A1 (en) * | 2005-05-04 | 2007-01-04 | Jurgen Schimanski | Process for producing a thermostable TiO2/SiO2 mixed oxide and mixed oxide produced therefrom |
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| CN106497147A (en) * | 2016-10-25 | 2017-03-15 | 锦州钛业有限公司 | A kind of preparation method with high covering power, high-weatherability and high whiteness TiO 2 pigment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115109455A (en) * | 2022-07-04 | 2022-09-27 | 徐建中 | White dyne liquid |
| WO2024007865A1 (en) * | 2022-07-04 | 2024-01-11 | 徐建中 | White dyne liquid |
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