Apparatus and method for preparing titanium dioxide sol, and paste composition prepared using same

Abstract

An apparatus for preparing a titanium dioxide (TiO2) sol is provided. The apparatus includes a storage unit configured to store an organic solvent mixture containing an aqueous titanium dioxide sol and a dispersing stabilizer, a separation unit connected to and installed at the storage unit and configured to separate the organic solvent mixture into titanium dioxide particles and an organic solvent mixture containing water and the dispersing stabilizer, a circulating solution transfer path connected and installed between the separation unit and storage unit and configured to transfer the titanium dioxide particles separated by the separation unit to the storage unit, and a discharge unit connected to and installed at one side of the separation unit and configured to discharge an organic solvent mixture containing the water and dispersing stabilizer separated by the separation unit.

Description

technical field

[0001] The present invention relates to a titanium dioxide sol preparation device and a preparation method, in particular to the preparation of a paste for screen printing from a water-based titanium dioxide sol by a solvent replacement method, preferably titanium dioxide (TiO2) for screen printing. 2 ) Titanium dioxide sol preparation device and preparation method of paste titanium dioxide sol. Background technique

[0002] Paste for screen printing, preferably titanium dioxide (TiO 2 ) paste coated on conductive glass or conductive film or conductive polymer, is used as the metal oxide electrode of the dye-sensitized solar cell.

[0003] In particular, a dye-sensitized solar cell is one in which an iodine-based oxidation / reduction electrolyte is injected between an electrode coated with a thin film of porous nano-oxide particles adsorbed with a ruthenium-based dye and an opposite electrode coated with platinum or carbon as a catalyst. After that, it is se...

Examples

preparation example Construction

[0028] According to another point of view, the preparation method of titanium dioxide sol provided by the present invention includes the following steps: (a) mixing 1-30 parts by weight of a dispersion stabilizer and 70-99 parts by weight of an organic solvent to prepare a sol containing a dispersion stabilizer Organic solvent mixture; (b) mixing the organic solvent mixture containing the dispersion stabilizer in the step (a) with the aqueous titanium dioxide sol at a volume ratio of 1:1 to 1:9 to prepare the aqueous titanium dioxide sol containing the dispersion stabilizer (c) using a separation unit to separate the organic solvent mixture containing aqueous titanium dioxide sol and dispersion stabilizer in step (b) into titanium dioxide particles and an organic solvent mixture containing water and dispersion stabilizer, and using an organic solvent to replace water for solvent replacement; (d) circulating and mixing the titanium dioxide particles separated according to the so...

Embodiment 1

[0077] Based on the overall weight of the mixture, 5% by weight of acetylacetone [Junsei, Japan] as a dispersion stabilizer was added to 99% pure ethanol [Samcheon, Republic of Korea] as an organic solvent, An organic solvent mixture containing a dispersion stabilizer was prepared in a total volume of 1 L, and then the mixture was stirred for about 30 minutes.

[0078] Next, after fully stirring the aqueous TiO2 sol [S5-300A, millennium chemicals, the United States] and the organic solvent mixture containing the dispersion stabilizer at a volume ratio of 1:1, at a temperature of 20°C, use figure 1 The titanium dioxide preparation device of the company repeatedly executes the process until the ethanol replaced by the solvent reaches more than 95%, so as to prepare the titanium dioxide sol replaced by the ethanol solvent.

[0079] At this time, an ultrafiltration membrane [UF membrane system, Kemicore, Korea] was used as the separation unit, and a heat exchanger [Heat exchanger,...

Embodiment 2

[0085] It was carried out in the same manner as in Example 1, except that 99% pure methanol (Samcheon, Korea) was used instead of 99% pure ethanol (Samcheon, Republic of Korea).

[0086] The result is expressed in Figure 4 and Figure 5 .

[0087] Such as Figure 4 As shown, the viscosity change chart with time of the titania sol replaced by the ethanol solvent of Example 1 and the titania sol replaced by the methanol solvent of Example 2 is shown, thus it can be found that the respective initial viscosities of 7cP and 8cP viscosities even After 30 days there was little change. This shows that the solvent-substituted titanium dioxide sols of Examples 1 and 2 can maintain their stability even after long-term storage.

technical field

[0001] The present invention relates to a titanium dioxide sol preparation device and a preparation method, in particular to the preparation of a paste for screen printing from a water-based titanium dioxide sol by a solvent replacement method, preferably titanium dioxide (TiO2) for screen printing. 2 ) Titanium dioxide sol preparation device and preparation method of paste titanium dioxide sol. Background technique

[0002] Paste for screen printing, preferably titanium dioxide (TiO 2 ) paste coated on conductive glass or conductive film or conductive polymer, is used as the metal oxide electrode of the dye-sensitized solar cell.

[0003] In particular, a dye-sensitized solar cell is one in which an iodine-based oxidation / reduction electrolyte is injected between an electrode coated with a thin film of porous nano-oxide particles adsorbed with a ruthenium-based dye and an opposite electrode coated with platinum or carbon as a catalyst. After that, it is se...

Examples

preparation example Construction

[0028] According to another point of view, the preparation method of titanium dioxide sol provided by the present invention includes the following steps: (a) mixing 1-30 parts by weight of a dispersion stabilizer and 70-99 parts by weight of an organic solvent to prepare a sol containing a dispersion stabilizer Organic solvent mixture; (b) mixing the organic solvent mixture containing the dispersion stabilizer in the step (a) with the aqueous titanium dioxide sol at a volume ratio of 1:1 to 1:9 to prepare the aqueous titanium dioxide sol containing the dispersion stabilizer (c) using a separation unit to separate the organic solvent mixture containing aqueous titanium dioxide sol and dispersion stabilizer in step (b) into titanium dioxide particles and an organic solvent mixture containing water and dispersion stabilizer, and using an organic solvent to replace water for solvent replacement; (d) circulating and mixing the titanium dioxide particles separated according to the so...

Embodiment 1

[0077] Based on the overall weight of the mixture, 5% by weight of acetylacetone [Junsei, Japan] as a dispersion stabilizer was added to 99% pure ethanol [Samcheon, Republic of Korea] as an organic solvent, An organic solvent mixture containing a dispersion stabilizer was prepared in a total volume of 1 L, and then the mixture was stirred for about 30 minutes.

[0078] Next, after fully stirring the aqueous TiO2 sol [S5-300A, millennium chemicals, the United States] and the organic solvent mixture containing the dispersion stabilizer at a volume ratio of 1:1, at a temperature of 20°C, use figure 1 The titanium dioxide preparation device of the company repeatedly executes the process until the ethanol replaced by the solvent reaches more than 95%, so as to prepare the titanium dioxide sol replaced by the ethanol solvent.

[0079] At this time, an ultrafiltration membrane [UF membrane system, Kemicore, Korea] was used as the separation unit, and a heat exchanger [Heat exchanger,...

Embodiment 2

[0085] It was carried out in the same manner as in Example 1, except that 99% pure methanol (Samcheon, Korea) was used instead of 99% pure ethanol (Samcheon, Republic of Korea).

[0086] The result is expressed in Figure 4 and Figure 5 .

[0087] Such as Figure 4 As shown, the viscosity change chart with time of the titania sol replaced by the ethanol solvent of Example 1 and the titania sol replaced by the methanol solvent of Example 2 is shown, thus it can be found that the respective initial viscosities of 7cP and 8cP viscosities even After 30 days there was little change. This shows that the solvent-substituted titanium dioxide sols of Examples 1 and 2 can maintain their stability even after long-term storage.

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