WO2016136764A1 - 酸化チタン粒子の分散液の製造方法 - Google Patents
酸化チタン粒子の分散液の製造方法 Download PDFInfo
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- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
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Definitions
- the present invention relates to an aqueous dispersion of titanium oxide particles and a method for producing an alcohol dispersion, and more specifically, an alcohol dispersion in which the dispersion diameter of titanium oxide particles contained in the aqueous dispersion and the transparency of the dispersion are substantially maintained.
- the present invention relates to a method for producing an alcohol dispersion in which the dispersion diameter and transparency of the titanium oxide particles are substantially maintained.
- the present invention relates to an aqueous dispersion and an alcohol dispersion of titanium oxide particles obtained by the method as described above.
- inorganic oxide particles such as silica, alumina, zinc oxide, tin oxide, zirconia, titania and the like have been used in various industrial fields, particularly in the optical field, in order to adjust the refractive index. It is used.
- titania particles have a high refractive index and are preferably used to increase the refractive index of optical materials.
- inorganic oxide particles including titanium oxide particles, generally have good dispersibility in aqueous solvents, but dispersibility is generally low in lipophilic organic solvents.
- the titanium oxide particles in the water slurry are peptized with an acid to obtain an aqueous dispersion of titanium oxide particles.
- the titanium oxide particles aggregate and enlarge, and the transparency of the resulting alcohol dispersion is significantly impaired.
- the present invention was made to solve the above-described problems in a method of obtaining an alcohol dispersion by replacing the dispersion medium of an aqueous dispersion of titanium oxide particles with alcohol, and the titanium oxide contained in the aqueous dispersion
- a method for producing an aqueous dispersion of titanium oxide particles that gives an alcohol dispersion that substantially maintains the dispersion diameter of the particles and the transparency of the dispersion, and an aqueous dispersion of such titanium oxide particles as a starting material.
- a method for producing an alcohol dispersion in which the dispersion medium in the aqueous dispersion of titanium oxide particles is replaced with alcohol, and the dispersion diameter and transparency of the titanium oxide particles in the aqueous dispersion of titanium oxide particles are substantially maintained.
- the purpose is to do.
- an object of the present invention is to provide an aqueous dispersion and an alcohol dispersion of titanium oxide particles obtained by the method described above.
- a water slurry of titanium oxide particles is wet-dispersed with a medium stirring mill or a high-pressure disperser in the presence of 15 to 250 mole parts of acetic acid and 15 to 90 mole parts of nitric acid with respect to 100 mole parts of titanium oxide.
- a first step of obtaining an aqueous dispersion of titanium oxide particles before washing (B) A method for producing an aqueous dispersion of titanium oxide particles comprising the second step of washing the aqueous dispersion of pre-cleaning titanium oxide particles obtained in the first step (a).
- a water slurry of titanium oxide particles is wet-dispersed with a medium stirring mill or a high-pressure disperser in the presence of 15 to 250 mole parts of acetic acid and 15 to 90 mole parts of nitric acid with respect to 100 mole parts of titanium oxide.
- a first step of obtaining an aqueous dispersion of titanium oxide particles before washing (B) a second step of washing the aqueous dispersion of titanium oxide particles before washing obtained in the first step (a); (C) Oxidation including a third step of substituting water, which is a dispersion medium of the aqueous dispersion of titanium oxide particles obtained in the second step (b), with at least one alcohol solvent selected from methanol and ethanol.
- a method for producing an alcohol dispersion of titanium particles is provided.
- the present invention provides an aqueous dispersion and an alcohol dispersion of titanium oxide particles obtained by the method described above.
- an aqueous dispersion of titanium oxide particles that gives an alcohol dispersion that substantially maintains the dispersion diameter of the titanium oxide particles contained in the aqueous dispersion and the transparency of the dispersion.
- the dispersion medium in the aqueous dispersion of titanium oxide particles is replaced with alcohol, whereby the aqueous dispersion of titanium oxide particles described above is used.
- An alcohol dispersion in which the dispersion diameter of the titanium oxide particles and the transparency of the aqueous dispersion of the titanium oxide particles are substantially maintained can be obtained.
- the method for producing an aqueous dispersion of titanium oxide particles comprises: (A) A water slurry of titanium oxide particles is wet-dispersed with a medium stirring mill or a high-pressure disperser in the presence of 15 to 250 mole parts of acetic acid and 15 to 90 mole parts of nitric acid with respect to 100 mole parts of titanium oxide. A first step of obtaining an aqueous dispersion of titanium oxide particles before washing; (B) a second step of cleaning the aqueous dispersion of pre-cleaning titanium oxide particles obtained in the first step (a).
- the crystal form of the titanium oxide particles is not particularly limited, and may be rutile, anatase, brookite, or a mixture thereof, but is preferably rutile or anatase type.
- the water slurry of titanium oxide particles is not particularly limited in the production method and origin thereof.
- the water slurry of titanium oxide particles obtained by the following method is the method of the present invention. It is an example of the water slurry of the titanium oxide particle which can be preferably used in FIG.
- the aqueous slurry of titanium oxide particles that can be preferably used in the method of the present invention is the following method: (1) After adjusting the chlorine ion concentration of the aqueous solution of titanium tetrachloride to 0.5 mol / L or more and less than 4.4 mol / L, the solution is heated at a temperature in the range of 25 to 75 ° C.
- a first step of decomposing and obtaining a water slurry containing precipitated rutile-type titanium oxide particles (2) The second step of obtaining a water slurry obtained by filtering and washing the water slurry obtained in the first step to remove dissolved water-soluble salts, (3) a third step in which the water slurry obtained in the second step is hydrothermally reacted in the presence of an organic acid; (4) The water slurry obtained in the third step can be filtered, washed with water, and obtained by a method including a fourth step of removing dissolved water-soluble salts.
- the first step is a step of hydrolyzing titanium tetrachloride in water to precipitate rutile titanium oxide particles to obtain a slurry containing such rutile titanium oxide particles. That is, in the first step, the titanium tetrachloride aqueous solution is in the range of 10 to 100 g / L as titanium oxide (TiO 2 , hereinafter the same), and the chlorine concentration is 0.5 mol / L or more. After adjusting by adding water to the titanium tetrachloride aqueous solution so as to be less than 4 mol / L, it is heated at a temperature in the range of 25 to 75 ° C. for 1 to 10 hours. Titanium chloride is hydrolyzed to deposit rutile titanium oxide particles.
- titanium tetrachloride When the hydrolysis temperature of titanium tetrachloride exceeds 75 ° C., the anatase type is added to the titanium tetrachloride hydrolyzate even if the chlorine ion concentration is in the range of 0.5 mol / L or more and less than 4.4 mol / L. Titanium oxide and brookite type titanium oxide may be mixed.
- the hydrolysis rate of titanium tetrachloride depends on the hydrolysis temperature, and the higher the temperature, the faster the hydrolysis rate, which is industrially advantageous.
- the hydrolysis rate of titanium tetrachloride is lower than 25 ° C., it is difficult to hydrolyze the titanium tetrachloride aqueous solution at a practical rate.
- the first step in particular, after adjusting the titanium tetrachloride aqueous solution by adding water so that the chlorine concentration of the titanium tetrachloride aqueous solution is 1.0 mol / L or more and 4.3 mol / L or less, although not limited to a temperature in the range of 30 to 75 ° C., it is preferable to heat for 1 to 5 hours to hydrolyze titanium tetrachloride to precipitate rutile titanium oxide particles.
- the second step is a step of removing the water-soluble salts dissolved in the slurry by filtering and washing the slurry obtained in the first step.
- the means and method for filtering and washing the slurry are not particularly limited, but an appropriate alkali is added to the slurry before filtration to adjust the pH of the slurry to the isoelectricity of titanium oxide. By making the point, the slurry can be efficiently filtered and washed with water.
- the slurry obtained in the second step is hydrothermally reacted in the presence of an organic acid as a particle growth inhibitor to increase crystallinity while suppressing the growth of rutile titanium oxide particles.
- an organic acid carboxylic acid or hydroxycarboxylic acid
- the carboxylic acid or hydroxycarboxylic acid may be a salt.
- organic acids include, for example, monocarboxylic acids such as formic acid, acetic acid and propionic acid and salts thereof, polybasic acids such as oxalic acid, malonic acid, succinic acid, fumaric acid and maleic acid and salts thereof.
- hydroxycarboxylic acids such as lactic acid, malic acid, tartaric acid, citric acid and gluconic acid, and salts thereof.
- carboxylic acid or hydroxycarboxylic acid salt for example, an alkali metal salt such as sodium salt or potassium salt is preferably used.
- the organic acid as described above is used in an amount of 75 parts by mole or more with respect to 100 parts by mole of titanium oxide, thereby suppressing the growth of the rutile-type titanium oxide particles obtained by the hydrothermal reaction. Can be effectively increased.
- the amount of the organic acid is less than 75 mole parts relative to 100 mole parts of titanium oxide, the effect of suppressing the growth of rutile titanium oxide particles is not observed in the hydrothermal reaction.
- a more preferable amount of the organic acid with respect to 100 mol parts of titanium oxide is 85 mol parts or more.
- the temperature of the hydrothermal reaction is in the range of 120 to 180 ° C.
- the temperature of the hydrothermal reaction is lower than 120 ° C.
- the crystallinity of the rutile-type titanium oxide particles is not enhanced.
- the temperature is higher than 180 ° C.
- the particle growth is remarkable. That is, it is difficult to increase crystallinity while suppressing particle growth.
- the hydrothermal reaction is carried out in the range of 140 to 160 ° C., the above effect can be obtained not only for enhancing crystallinity but also for suppressing the growth of rutile type titanium oxide particles, as well as for a short time reaction. It is advantageous.
- an appropriate water-soluble alkali such as a sodium hydroxide aqueous solution is added to the slurry obtained by the hydrothermal reaction in the third step to neutralize the organic acid in the slurry, and then the slurry. Is filtered, washed with water, water-soluble salts dissolved in the slurry are removed, and the obtained titanium oxide particles are repulped into water to obtain a target water slurry of titanium oxide particles.
- the means and method for filtering and washing the aqueous slurry of titanium oxide particles are not limited at all, but as described above, it is suitable for the slurry obtained by the hydrothermal reaction.
- By adding an alkali and setting the pH of the slurry to the isoelectric point of titanium oxide it is possible to efficiently perform filtration and washing with water.
- the aqueous slurry of titanium oxide particles is subjected to the steps (a) to (c) to oxidize. An alcohol dispersion of titanium particles is obtained.
- the step (a) is a step in which acetic acid and nitric acid are added to an aqueous slurry of titanium oxide to peptize the rutile titanium oxide particles, followed by wet dispersion treatment to obtain an aqueous dispersion of titanium oxide particles.
- this step (c) by adding acetic acid and nitric acid to the titanium oxide water slurry, deflocculating the titanium oxide, and then wet-dispersing the titanium oxide water slurry.
- Titanium oxide excellent in transparency by suppressing aggregation of titanium oxide particles in the dispersion liquid even when the ratio of alcohol as the dispersion medium increases in the resulting dispersion liquid when replacing water as the dispersion medium with alcohol Can be obtained.
- the titanium oxide When only the nitric acid is added to the titanium oxide water slurry, the titanium oxide is peptized, and then wet dispersed.
- the water which is the dispersion medium of the water slurry is replaced with alcohol, As the proportion of the alcohol increases, the titanium oxide particles in the dispersion aggregate and the transparency is impaired.
- acetic acid when acetic acid and nitric acid are added to an aqueous slurry of titanium oxide to peptize the titanium oxide, acetic acid is in a range of 15 to 250 mol parts with respect to 100 mol parts of titanium oxide. In the range of 15 to 90 parts by mole.
- the wet dispersion treatment in the step (a) is performed using a medium stirring mill or a high-pressure disperser.
- a medium stirring mill for example, a bead mill is preferably used.
- the beads those having a Mohs hardness higher than that of titania are preferable.
- zirconia beads are preferably used. According to a preferred embodiment, zirconia beads having a diameter of 15 to 300 ⁇ m are charged into a bead mill and dispersed to obtain an aqueous dispersion of rutile titanium oxide particles.
- the step (b) is a step of removing excess acids and water-soluble salts dissolved in the aqueous dispersion in order to give dispersion stability to the aqueous dispersion of titanium oxide obtained in the step (a). It is.
- the means and method for removing the excess acids and the water-soluble salts dissolved in the aqueous dispersion are not particularly limited, and can be, for example, dialysis or ultrafiltration.
- the titanium oxide aqueous dispersion obtained in the above step (a) contains acetic acid and nitric acid used as a peptizer, and its electrical conductivity is usually greater than 10 mS / cm.
- rutile type titanium oxide particles having excellent dispersion stability by washing until the electric conductivity of the aqueous dispersion reaches 0.5 to 5 mS / cm, preferably 1 to 4 mS / cm. Can be obtained.
- titanium tetrachloride is hydrolyzed in an aqueous solution to precipitate rutile-type titanium oxide particles, which are hydrothermally treated in the presence of an organic acid, while suppressing particle growth,
- the crystallinity was improved, and then according to the present invention, the water slurry of the rutile type titanium oxide particles obtained in this way was added with acetic acid and nitric acid, and then peptized, followed by wet dispersion treatment.
- the rutile titanium oxide particles are stabilized as fine particles without agglomeration.
- the titanium oxide particles in the aqueous dispersion can be obtained by substituting the dispersion medium of the aqueous dispersion thus obtained with alcohol. Fine The Do dispersion diameter and high transparency aqueous dispersion can be obtained an alcohol dispersion is substantially maintained.
- an aqueous dispersion of titanium oxide particles having excellent transparency including finely dispersed titanium oxide particles can be obtained. That is, the titanium oxide particle content is 10% by weight or more, the total light transmittance is 50% or more, and in the particle size distribution measured by the dynamic light scattering method, the D50 of the titanium oxide particles is 1 to 20 nm, preferably An aqueous dispersion of titanium oxide particles having a range of 2 to 10 nm, D90 of 40 nm or less, D100 of preferably 80 nm or less, and a viscosity at 25 ° C. of 10 mPa ⁇ s or less can be obtained.
- nitric acid is used in an amount of 15 to 90 mol parts, preferably 20 to 80 mol parts, and acetic acid is used in an amount exceeding 100 mol parts with respect to 100 mol parts of titanium oxide. That is, when the aqueous dispersion of titanium oxide particles obtained is used in the range of 110 to 200 mol parts, the fine dispersion diameter of the titanium oxide particles in the aqueous dispersion when the dispersion medium is replaced with alcohol. And an alcohol dispersion in which the high transparency of the aqueous dispersion is substantially maintained.
- titanium oxide particles are contained by substituting water, which is a dispersion medium of the aqueous dispersion of titanium oxide particles obtained as described above, with the alcohol solvent.
- the total light transmittance is 50% or more
- D50 is in the range of 1 to 20 nm, preferably 2 to 10 nm
- D90 is 40 nm or less
- D100 is preferably 80 nm or less
- “Microza” (type ACP-1010D, molecular weight cut off 13000) manufactured by Asahi Kasei Chemicals Corporation was used for ultrafiltration.
- the dispersion diameter of the titanium oxide particles in the dispersion was measured by a dynamic light scattering method (UPA-UT manufactured by Nikkiso Co., Ltd.).
- the total light transmittance of the dispersion of titanium oxide particles was measured by filling a cell having an optical path length of 10 mm with ion-exchanged water using a haze meter (NDH4000 manufactured by Nippon Denshoku Industries Co., Ltd.).
- measured T 0 similarly filled with a dispersion cell was measured for light transmittance T, it was determined as (T / T 0) ⁇ 100 .
- Viscosity was measured with a tuning-fork vibration type SV viscometer (SV-1A (measured viscosity range: 0.3 to 1000 mPa ⁇ s) manufactured by A & D Corp.).
- SV-1A tuning-fork vibration type SV viscometer
- Reference example 1 Preparation of water slurry A of rutile titanium oxide particles
- a separable flask equipped with a reflux apparatus was charged with 3 L of a titanium tetrachloride aqueous solution adjusted to 50.7 g / L as titanium oxide based on a chlorine ion concentration of 2.3 mol / L and a titanium ion concentration, and 70 ° C. was heated for 3 hours and hydrolyzed to obtain a water slurry containing precipitated rutile titanium oxide particles.
- the water slurry was filtered using a glass fiber filter with a collection diameter of 300 nm to remove unreacted titanium tetrachloride and dissolved components.
- the titanium oxide particles thus obtained are repulped into water, and after adding an aqueous sodium hydroxide solution to the obtained water slurry until the pH of the water slurry becomes 7.0, glass fibers having a collection diameter of 300 nm. It was filtered using a filter paper and washed with water. At this time, when the rutile-type titanium oxide particles are repulped into water so as to be 50 g / L as titanium oxide, the slurry is repeatedly filtered, washed with water until the electric conductivity of the slurry becomes 100 ⁇ S / cm or less, and water-soluble. Salts were removed. (Second step)
- the rutile-type titanium oxide particles obtained in the second step are repulped into water so as to be 50 g / L as titanium oxide, and 150 mol parts of acetic acid is added to 100 mol parts of titanium oxide in the obtained water slurry.
- a hydrothermal reaction was performed at 150 ° C. for 3 hours to increase the crystallinity of the rutile-type titanium oxide particles.
- a sodium hydroxide aqueous solution was added to the water slurry obtained by the hydrothermal reaction until the pH became 5.0, and then filtered and washed with glass fiber filter paper having a collection diameter of 300 nm.
- the rutile-type titanium oxide particles are repulped into water so as to be 100 g / L as titanium oxide
- the slurry is repeatedly filtered and washed with water until the electric conductivity of the slurry becomes 100 ⁇ S / cm or less. Salts were removed, and the obtained rutile type titanium oxide particles were repulped into water so as to be 100 g / L as titanium oxide to obtain an aqueous slurry A of rutile type titanium oxide particles.
- Example 1 To the water slurry A of rutile-type titanium oxide particles obtained in Reference Example 1, 152 mol parts of acetic acid and 52 mol parts of nitric acid are added to 100 mol parts of titanium oxide, and after peptization, water is added, The water slurry was diluted as titanium oxide to 50 g / L.
- the aqueous dispersion of the rutile type titanium oxide particles is concentrated until the content of the rutile type titanium oxide particles is 15% by weight, and washed with an ultrafiltration membrane until the electric conductivity becomes 3.2 mS / cm, Excess acid and water-soluble salts were removed to obtain a titanium oxide aqueous dispersion (1-Ia).
- Examples 2 to 9 The same as Example 1 except that the water slurry A of rutile-type titanium oxide particles obtained in Reference Example 1 was peptized by adding acetic acid and nitric acid at a ratio shown in Table 1 with respect to 100 mol parts of titanium oxide. Then, an aqueous dispersion of titanium oxide (2-Ia to 9-Ia) and a methanol dispersion of titanium oxide (2-IIa to 9-IIa) were obtained.
- Example 10 An aqueous slurry of anatase type titanium oxide particles (CSB-M manufactured by Sakai Chemical Industry Co., Ltd.) was diluted with water to obtain an aqueous slurry B having a titanium oxide content of 100 g / L. To this water slurry of titanium oxide particles, 152 mol parts of acetic acid and 52 mol parts of nitric acid are added with respect to 100 mol parts of titanium oxide, and after peptization, water is added to obtain 50 g / L of water slurry as titanium oxide. Diluted.
- the aqueous dispersion of the rutile-type titanium oxide particles is concentrated until the titanium oxide particle content is 15% by weight, and washed with an ultrafiltration membrane until the electric conductivity becomes 3.8 mS / cm. And water-soluble salts were removed to obtain an aqueous dispersion (10-Ia) of titanium oxide particles.
- Comparative Example 1 To the water slurry A of rutile-type titanium oxide particles obtained in Reference Example 1, 52 mole parts of nitric acid was added to 100 mole parts of titanium oxide, peptized, water was added, and the water slurry was used as titanium oxide. Dilute to 50 g / L.
- the water slurry 2L thus obtained was wet-dispersed for 18 hours using a circulating bead mill “Ultra Apex Mill UAM-05” manufactured by Kotobuki Industries Co., Ltd., and an aqueous dispersion of rutile titanium oxide particles was obtained. Obtained.
- zirconia beads having a diameter of 30 ⁇ m were used, and the rotation speed of the bead mill was 2940 rpm.
- the aqueous dispersion of the rutile type titanium oxide particles is concentrated until the content of the rutile type titanium oxide particles becomes 15% by weight, and washed with an ultrafiltration membrane until the electric conductivity becomes 3.7 mS / cm, Excess acid and water-soluble salts were removed to obtain an aqueous dispersion of titanium oxide (1-Ib).
- the obtained aqueous dispersion of titanium oxide particles (1-Ib) had a low transmittance, a large dispersion diameter, and poor transparency. Further, in the methanol dispersion liquid (1-IIb) obtained by substituting water, which is the dispersion medium of the aqueous dispersion liquid, with titanium oxide particles, the dispersion diameter is significantly enlarged, The transparency was also worse.
- Comparative Example 2 To the water slurry A of rutile-type titanium oxide particles obtained in Reference Example 1, 152 mol parts of acetic acid is added to 100 mol parts of titanium oxide, peptized, water is added, and the water slurry is used as titanium oxide. Dilute to 50 g / L.
- the slurry 2L thus obtained was wet-dispersed for 18 hours using a circulating bead mill “Ultra Apex Mill UAM-05” manufactured by Kotobuki Industries Co., Ltd. to obtain an aqueous dispersion of rutile titanium oxide particles. It was.
- zirconia beads having a diameter of 30 ⁇ m were used, and the rotation speed of the bead mill was 2940 rpm.
- aqueous dispersion of rutile titanium oxide particles is concentrated until the content of rutile titanium oxide particles is 15% by weight and washed with an ultrafiltration membrane to remove excess acids and water-soluble salts. In the process, the viscosity increased and gelled.
- Comparative Examples 3-6 Example 1 except that acetic acid and nitric acid were added to the water rally A of the rutile-type titanium oxide particles obtained in Reference Example 1 to 100 mol parts of titanium oxide and peptized by adding acetic acid and nitric acid at the ratio shown in Table 2. The same treatment was performed to obtain a titanium oxide aqueous dispersion (3-Ib to 6-Ib) and a titanium oxide methanol dispersion (3-IIb to 6-IIb).
- the dispersion diameters D50, D90 and D100 obtained from the particle size distribution measurement by the method are shown in Tables 1 and 2.
- nitric acid is used in combination at a predetermined ratio with respect to 100 mol parts of titanium oxide.
- the aqueous slurry of titanium particles is peptized and wet-dispersed to obtain an aqueous dispersion of titanium oxide particles.
- the fine dispersion diameter and water dispersion of the titanium oxide particles in the aqueous dispersion are obtained.
- An alcohol dispersion with excellent transparency in the liquid can be obtained.
- an aqueous slurry of titanium oxide particles is obtained, and this is peptized in the presence of acetic acid and nitric acid according to the present invention, wet-dispersed, and dissolved in excess acids.
- acetic acid and nitric acid according to the present invention wet-dispersed, and dissolved in excess acids.
- Comparative Example 1 it is possible to obtain a methanol dispersion of titanium oxide by degreasing the titanium oxide aqueous slurry using only nitric acid and then replacing the dispersion medium with methanol.
- the titanium oxide particles remarkably aggregated and the enlargement of the dispersion diameter was remarkable.
- the titanium oxide aqueous slurry was peptized using only acetic acid and then wet dispersed to obtain an aqueous dispersion of titanium oxide particles, which was concentrated to obtain an ultrafiltration membrane. In the process of removing excess acids and water-soluble salts by washing with, the viscosity increased and gelled.
- the amount of nitric acid used is 100 mol parts or more with respect to 100 mol parts of titanium oxide, as shown in Comparative Examples 3 to 5, the obtained aqueous dispersion and alcohol can be used regardless of the amount of acetic acid used. In all of the dispersions, the titanium oxide particles were remarkably aggregated and had low transparency.
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Abstract
Description
(a)酸化チタン100モル部に対して、酢酸15~250モル部と硝酸15~90モル部の存在下に、酸化チタン粒子の水スラリーを媒体撹拌ミル又は高圧分散機にて湿式分散処理して、洗浄前の酸化チタン粒子の水分散液を得る第1工程と、
(b)上記第1工程(a)で得られた洗浄前酸化チタン粒子の水分散液を洗浄する第2工程とを含む酸化チタン粒子の水分散液の製造方法が提供される。
(a)酸化チタン100モル部に対して、酢酸15~250モル部と硝酸15~90モル部の存在下に、酸化チタン粒子の水スラリーを媒体撹拌ミル又は高圧分散機にて湿式分散処理して、洗浄前の酸化チタン粒子の水分散液を得る第1工程と、
(b)上記第1工程(a)で得られた洗浄前の酸化チタン粒子の水分散液を洗浄する第2工程と、
(c)上記第2工程(b)で得られた酸化チタン粒子の水分散液の分散媒である水をメタノール及びエタノールから選ばれる少なくとも1種のアルコール溶媒に置換する第3工程とを含む酸化チタン粒子のアルコール分散液の製造方法が提供される。
(a)酸化チタン100モル部に対して、酢酸15~250モル部と硝酸15~90モル部の存在下に、酸化チタン粒子の水スラリーを媒体撹拌ミル又は高圧分散機にて湿式分散処理して、洗浄前の酸化チタン粒子の水分散液を得る第1工程と、
(b)上記第1工程(a)で得られた洗浄前酸化チタン粒子の水分散液を洗浄する第2工程とを含むものである。
(1)四塩化チタン水溶液の塩素イオン濃度を0.5モル/L以上、4.4モル/L未満に調整した後、25~75℃の範囲の温度にて加熱し、四塩化チタンを加水分解して、析出したルチル型酸化チタン粒子を含む水スラリーを得る第1工程、
(2)上記第1工程で得られた水スラリーを濾過、水洗して、溶存する水溶性塩類を除去した水スラリーを得る第2工程、
(3)上記第2工程で得られた水スラリーを有機酸の存在下に水熱反応させる第3工程、
(4)上記第3工程で得られた水スラリーを濾過、水洗して、溶存する水溶性塩類を除去する第4工程
を含む方法によって得ることができる。
(ルチル型酸化チタン粒子の水スラリーAの調整)
還流装置を備えたセパラブルフラスコに塩素イオン濃度2.3モル/L、チタンイオン濃度に基づいて、酸化チタンとして50.7g/Lとなるように調整した四塩化チタン水溶液を3L仕込み、70℃で3時間加熱し、加水分解して、析出したルチル型酸化チタン粒子を含む水スラリーを得た。(第1工程)
参考例1にて得られたルチル型酸化チタン粒子の水スラリーAに酸化チタン100モ ル部に対して酢酸152モル部と硝酸52モル部を加えて、解膠した後、水を加えて、水スラリーを酸化チタンとして50g/Lとなるように希釈した。
参考例1にて得られたルチル型酸化チタン粒子の水スラリーAに酸化チタン100モル部に対して表1に記載の割合で酢酸と硝酸を加えて解膠した以外は、実施例1と同様に処理して、酸化チタンの水分散液(2-Ia~9-Ia)及び酸化チタンのメタノール分散液(2-IIa~9-IIa)を得た。
アナターゼ型酸化チタン粒子の水スラリー(堺化学工業(株)製CSB-M)を水で希釈して、酸化チタン含有率100g/Lの水スラリーBとした。この酸化チタン粒子の水スラリーに酸化チタン100モル部に対して酢酸152モル部と硝酸52モル部とを加え、解膠した後、水を加えて、水スラリーを酸化チタンとして50g/Lとなるように希釈した。
参考例1にて得られたルチル型酸化チタン粒子の水スラリーAに酸化チタン100モ ル部に対して硝酸52モル部を加えて、解膠した後、水を加え、水スラリーを酸化チタンとして50g/Lとなるように希釈した。
参考例1にて得られたルチル型酸化チタン粒子の水スラリーAに酸化チタン100モ ル部に対して酢酸152モル部を加えて、解膠した後、水を加え、水スラリーを酸化チタンとして50g/Lとなるように希釈した。
参考例1にて得られたルチル型酸化チタン粒子の水ラリーAに酸化チタン100モル部に対して、表2に記載の割合で酢酸と硝酸を加えて解膠した以外は、実施例1と同様に処理を行い、酸化チタン水分散液(3-Ib~6-Ib)と酸化チタンのメタノール分散液(3-IIb~6-IIb)を得た。
Claims (8)
- (a)酸化チタン100モル部に対して、酢酸15~250モル部と硝酸15~90モル部の存在下に、酸化チタン粒子の水スラリーを媒体撹拌ミル又は高圧分散機にて湿式分散処理して、洗浄前の酸化チタン粒子の水分散液を得る第1工程と、
(b)上記第1工程(a)で得られた洗浄前酸化チタン粒子の水分散液を洗浄する第2工程とを含む酸化チタン粒子の水分散液の製造方法。 - 酸化チタン100モル部に対して、酢酸110~200モル部と硝酸20~80モル部の存在下に、酸化チタン粒子の水スラリーを湿式分散処理する請求項1に記載の酸化チタン粒子の水分散液の製造方法。
- 前記第2工程(b)において、洗浄前酸化チタン粒子の水分散液をその電気伝導度が0.5~5mS/cmの範囲に至るまで洗浄する請求項1に記載の酸化チタン粒子の水分散液の製造方法。
- 請求項1から3のいずれかに記載の方法によって得られる、酸化チタン粒子を10重量%以上の含有率にて含み、全光線透過率が50%以上であり、25℃における粘度が10mPa・s以下である酸化チタン粒子の水分散液。
- (a)酸化チタン100モル部に対して、酢酸15~250モル部と硝酸15~90モル部の存在下に、酸化チタン粒子の水スラリーを媒体撹拌ミル又は高圧分散機にて湿式分散処理して、洗浄前の酸化チタン粒子の水分散液を得る第1工程と、
(b)上記第1工程(a)で得られた洗浄前の酸化チタン粒子の水分散液を洗浄する第2工程と、
(c)上記第2工程(b)で得られた酸化チタン粒子の水分散液の分散媒である水をメタノール及びエタノールから選ばれる少なくとも1種のアルコール溶媒に置換する第3工程とを含む酸化チタン粒子のアルコール分散液の製造方法。 - 酸化チタン100モル部に対して、酢酸110~200モル部と硝酸20~80モル部の存在下に酸化チタン粒子の水スラリーを湿式分散処理する請求項5に記載の酸化チタン粒子のアルコール分散液の製造方法。
- 前記第2工程(b)において、洗浄前酸化チタン粒子の水分散液をその電気伝導度が0.5~5mS/cmの範囲に至るまで洗浄する請求項5に記載の酸化チタン粒子のアルコール分散液の製造方法。
- 請求項5~7のいずれかに記載の方法によって得られる、酸化チタン粒子を10重量%以上の含有率にて含み、全光線透過率が50%以上であり、25℃における粘度が10mPa・s以下である酸化チタン粒子のアルコール分散液。
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