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Thermochromic microparticles, dispersions thereof, and manufacturing method thereof, as well as light-modulating coatings, light-modulating films and light-modulating inks

A manufacturing method and technology for microparticles, which can be used in color-changing fluorescent materials, heat-sensitive coatings, chemical instruments and methods, etc., and can solve the problems of poor dimming, particle agglomeration, and difficulty in obtaining sub-micron microparticles.

Inactive Publication Date: 2011-05-18
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, if the fine particles are heat-treated at high temperature for reduction firing, as mentioned above, the particles will aggregate, and finally it is difficult to obtain submicron-sized fine particles.
Therefore, obtained by the above method containing VO 2 The fine particles also have the problem of poor dimming

Method used

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  • Thermochromic microparticles, dispersions thereof, and manufacturing method thereof, as well as light-modulating coatings, light-modulating films and light-modulating inks
  • Thermochromic microparticles, dispersions thereof, and manufacturing method thereof, as well as light-modulating coatings, light-modulating films and light-modulating inks
  • Thermochromic microparticles, dispersions thereof, and manufacturing method thereof, as well as light-modulating coatings, light-modulating films and light-modulating inks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] First, vanadium pentoxide (V 2 o 5 , Wako special grade), oxalic acid dihydrate ((COOH) 2 2H 2 O, Wako Chemical Special Grade) and 200ml of pure water, and prepare an aqueous solution by stirring. Furthermore, 1.5 ml of sulfuric acid was added to this aqueous solution for pH adjustment.

[0112] Next, commercially available titanium dioxide (TiO 2 ) powder (a purity of 99% or more, an average particle size of 100nm or less, and a rutile ratio of 40% or more), the titanium dioxide (TiO 2 ) powder relative to V 2 o 5 The weight ratio is 50%, thus obtaining a cloudy liquid.

[0113] Next, the turbid liquid is sealed in a commercially available pressure cooker for hydrothermal reaction (Hu-25 type manufactured by Sanai Scientific Co., Ltd.) (Teflon (registered trademark) inner cylinder with a volume of 25 ml in the SUS body), and the pressure cooker is heated at 220 ℃ for 24 hours to carry out hydrothermal reaction. Accordingly, fine particles in a monodisperse sta...

Embodiment 2

[0123] In Example 2, rutile-type titanium dioxide prepared in a laboratory was used as a seed crystal.

[0124] First, at room temperature, 10ml of titanium tetrachloride (TiCl 4 ) aqueous solution (Ti concentration 16.5% by weight) was dropped into 30 ml of pure water while stirring to prepare a diluted solution of titanium chloride. The diluted solution was poured into a glass beaker, covered and placed in a constant temperature dryer, and kept at 55° C. for 6 hours. The resulting product was filtered, washed repeatedly with pure water, and then dried. Through this step, white titanium oxide powder was obtained. As a result of XRD measurement, it was confirmed that the obtained powder was rutile titanium dioxide (TiO 2 ).

[0125] Secondly, in addition to the rutile titanium dioxide (TiO 2 ) powder as a seed crystal, the fine particles of Example 2 were obtained by the same procedure as in Example 1.

[0126] Figure 6 The XRD measurement results of the obtained fine ...

Embodiment 3

[0128] The fine particles of Example 3 were prepared in the same procedure as in Example 1 above. However, in this example, ammonium tungstate p-pentahydrate (Wako Pure Chemicals, composed of about (NH 4 )10W 12 o 41 ·5H2 O) so that the W:V atomic ratio is 1.0%.

[0129] Figure 8 shows the measurement results of the optical transmission characteristics of the dimming glass substrate samples at 10°C and 80°C. Also in this sample, it was confirmed that the transmittance changes with temperature. Figure 9 The results of the temperature dependence of the infrared transmittance at a wavelength of 2000 nm measured using this sample are shown in . From this figure, it is clear that the transmittance changes rapidly as the temperature rises. It should be noted that, in this example, the transition temperature is about 41°C. It was confirmed that the transition temperature can be lowered by adding tungsten.

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Abstract

Provided are thermochromic microparticles that comprise particles of rutile (R-phase) vanadium dioxide (VO2) and rutile titanium dioxide (TiO2). At least one of the vanadium dioxide (VO2) particles is grown on the titanium dioxide (TiO2) particles so as to be larger than said titanium dioxide (TiO2) particles and in a rod form.

Description

technical field [0001] The present invention relates to a kind of particle and its dispersion liquid, relate in particular to the vanadium dioxide (VO 2 ) microparticles and their dispersions. The present invention also relates to a method for producing the microparticles and a light-adjustable paint, a light-adjustable film, and a light-adjustable ink containing the microparticles. Background technique [0002] In places where the main heat exchange (such as glass windows) is performed between the interior (indoor, vehicle) and the external environment of buildings such as houses or high-rise buildings, and moving objects such as vehicles, it is desirable to apply automatic Light-adjusting material (for example, Patent Document 1: Japanese Patent No. 2735147 specification). [0003] "Auto-dimming material" refers to a material whose optical properties such as transparent state / reflective state can be controlled according to temperature. For example, when this material is...

Claims

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Application Information

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IPC IPC(8): C01G31/00B01J35/02C01G23/00C09D5/26C09D7/12C09D11/00C09K9/00C01G23/047C01G31/02C03C17/22C09C1/36C09C3/06C09D5/00C09D7/61C09D201/00C09K3/00
CPCC09K11/693B01J35/004C09D7/1275C09D11/50C08K3/22C01P2002/72C09C1/0084C01P2002/52C09D7/1291C09D11/037B82Y30/00C01P2006/36C01P2004/03C09D17/007C09D7/1266B01J23/22C01P2004/16B01J37/10C09D5/26C01P2004/64C08K9/04C09K9/00C01P2004/04C01G31/02C01P2004/62C09D7/67C09D7/68C09D7/70C09D7/61B01J35/39
Inventor 金平纪士东田泽真人
Owner NAT INST OF ADVANCED IND SCI & TECH
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