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Method for producing vanadium dioxide-containing particle and dispersion

A technology of vanadium dioxide and manufacturing method, applied in vanadium oxide, chemical instruments and methods, treatment of dyed organosilicon compounds, etc., can solve the problems of inability to fully exert thermal discoloration, unstable vanadium dioxide, insufficient dispersion and the like , to achieve the effect of excellent thermal discoloration and transparency

Inactive Publication Date: 2017-03-22
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the general wet-type surface modification method disclosed in these patent documents 1 and 2, since the particles are surface-modified after passing through the drying process, vanadium dioxide is very unstable, and as a result, Sufficient surface modification cannot be performed if deterioration has already progressed or aggregation has occurred prior to surface modification
[0008] In addition, Patent Document 3 also discloses a technology for preventing the deterioration of particles by performing surface modification, but since the surface modification is carried out by dispersing the vanadium dioxide powder again, it is considered that the particles aggregate in the powder and dispersion is not enough. fully
[0009] In addition, as disclosed in the above-mentioned patent documents, etc., in the case of performing surface modification on particles that have undergone a drying process once, there is a problem that if the particles are broken, the part that has not been surface-modified is exposed, and the effect cannot be fully exerted. Thermochromism

Method used

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  • Method for producing vanadium dioxide-containing particle and dispersion
  • Method for producing vanadium dioxide-containing particle and dispersion

Examples

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Embodiment

[0111] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. In addition, the expression of "%" is used in an Example, Unless otherwise specified, it shows "mass %".

[0112] "Production of Particles Containing Vanadium Dioxide"

[0113] (1) Production of particles 101 containing vanadium dioxide

[0114] Particles were prepared referring to the method described in Example 4 of Patent Document 1.

[0115] Specifically, ammonium metavanadate (NH 4 VO 3 , Wako Pure Chemical Industries, Ltd.) 0.6 g was stirred at normal temperature (25° C.) for 15 minutes.

[0116] Next, slowly add hydrazine monohydrate (N 2 h 4 ·H 2 (0, special grade, Wako Pure Chemical Industries, Ltd.) 5% by mass aqueous solution to prepare a solution with a pH value (25° C.) of 9.0.

[0117] Put the prepared solution into a 50ml set of static type HU for high-pressure reaction decomposition vessel (outer cylinder made of pressure-resi...

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Abstract

The present invention addresses the problem of providing a method for producing vanadium dioxide-containing particles having excellent thermochromic performance and transparency. This method for producing vanadium dioxide-containing particles is a method for producing, using hydrothermal reaction, vanadium dioxide-containing particles having thermochromic performance, wherein the method is characterized in that the vanadium dioxide-containing particle surface is surface modified without causing separation of a solvent and the vanadium dioxide-containing particles.

Description

technical field [0001] The present invention relates to a method for producing vanadium dioxide-containing particles and a dispersion liquid. More specifically, it relates to a method for producing vanadium dioxide-containing particles excellent in thermochromism and transparency, and a dispersion. Background technique [0002] Vanadium dioxide (VO 2 ) is attracting attention as a material showing a thermochromic phenomenon in which optical properties such as transmittance and reflectance change reversibly due to temperature changes. [0003] In the crystal structure of vanadium dioxide, there are several crystal phase polymorphs such as A phase, B phase, C phase, and R phase (so-called "rutile crystal phase"). However, the crystal structure exhibiting the above-mentioned thermal discoloration is limited to the R phase. This R phase does not show thermal discoloration below the transition temperature and has a monoclinic structure, so it is also called M phase. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B82Y40/00C09K9/00
CPCB82Y30/00B82Y40/00C01G31/02C01P2004/64C01P2006/60C09C1/00C09K9/00Y10S977/773Y10S977/811Y10S977/892Y10S977/902B82Y20/00C01P2004/51C09C3/08C09C3/12
Inventor 鹫巢贵志
Owner KONICA MINOLTA INC