Carbon-coated vanadium dioxide particles

A technology of vanadium dioxide particles and vanadium dioxide, which is applied in the direction of vanadium oxide, inorganic chemistry, tungsten compounds, etc., can solve the problems of inability to obtain particle size, small vanadium dioxide nanoparticles, etc., achieve excellent sintering inhibition effect, improve crystallization Sex, the effect of inhibiting oxidation or reduction

Active Publication Date: 2017-05-10
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particles obtained by this method are coarse particles obtained by sintering many particles, and there is a problem that vanadium dioxide nanoparticles with small particle diameters cannot be obtained.

Method used

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  • Carbon-coated vanadium dioxide particles
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  • Carbon-coated vanadium dioxide particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] (Production of vanadium dioxide particles)

[0123] Containing 1.299g of ammonium metavanadate (NH 4 VO 3 ) was slowly added dropwise to 4 ml of 10% hydrazine aqueous solution, and allowed to react at room temperature for 1 hour. Thereafter, the reaction liquid was transferred to a stainless steel pressure-resistant container with a fluorine-containing resin inner cylinder, and reacted at 270° C. for 48 hours. After the reaction, the particles were separated from the solution by centrifugation and washed three times. Afterwards, the particles were recovered by drying at 50°C.

[0124] Moreover, the particle diameter (volume average particle diameter) of the obtained vanadium dioxide particle was measured using the particle size distribution meter (Nikkiso Co., Ltd. make, MICROTRAC UAM-1).

[0125] (Formation of coating layer)

[0126] 0.1 g of 1,5-dihydroxynaphthalene (manufactured by Tokyo Chemical Industry Co., Ltd.), 0.05 g of 40% methylamine (manufactured by Wa...

Embodiment 2

[0133] Carbon-coated vanadium dioxide particles were produced in the same manner as in Example 1 except that vanadium dioxide particles were produced by the method shown below. In addition, in "(formation of coating layer)" of Example 1, "heating at 150 degreeC for 2 hours" was changed to "heating at 200 degreeC for 2 hours".

[0134] (Production of vanadium dioxide particles)

[0135] Containing 1.299g ammonium metavanadate (NH 4 VO 3 ) and 0.0329g ammonium tungstate hydrate ((NH 4 ) 10 W 12 o 41 ·5H 2O) 4.5 ml of 10% aqueous hydrazine solution was slowly added dropwise to 50 ml of the aqueous dispersion, and allowed to react at room temperature for 1 hour. Thereafter, the reaction solution was transferred to a stainless steel pressure vessel with a fluorine-containing resin inner cylinder, and reacted at 270° C. for 48 hours. After the reaction, the particles were separated from the solution by centrifugation and washed three times. Thereafter, the vanadium dioxide ...

Embodiment 3

[0138] Carbon-coated vanadium dioxide particles were produced in the same manner as in Example 1 except that the vanadium dioxide particles obtained in Example 2 were used to form a coating layer by the following method.

[0139] (Formation of coating layer)

[0140] 0.07 g of 1,5-dihydroxynaphthalene (manufactured by Tokyo Chemical Industry Co., Ltd.), 0.03 g of 40% methylamine (manufactured by Wako Pure Chemical Industries, Ltd.), and 0.07 g of 37% aqueous formaldehyde (manufactured by Wako Pure Chemical Industries, Ltd.) were sequentially dissolved in In ethanol, make 20g of ethanol mixed solution.

[0141] Next, 0.2 g of tungsten-doped vanadium dioxide particles were added to the obtained liquid mixture, and the mixture was treated in an ultrasonic bath for 6 hours. The solution was filtered, washed with ethanol three times, and vacuum-dried at 50° C. for 3 hours. Further, the dried particles were heated at 150° C. for 2 hours to obtain carbon-coated vanadium dioxide par...

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Abstract

The present invention provides carbon-coated vanadium dioxide particles, in which sintering between particles can be suppressed during high temperature baking, which have high crystallinity and oxidation resistance, and in which excellent thermochromic properties can be maintained despite long-term storage or use. Furthermore, the purpose of the present invention is to provide a resin composition, a coating film, a film, an interlayer film for laminated glass, laminated glass, and a pasting film, which are obtained using said carbon-coated vanadium dioxide particles. The present invention pertains to carbon-coated vanadium dioxide particles having a coating layer comprising amorphous carbon on the surfaces of the vanadium dioxide particles, the amorphous carbon being derived from carbon contained in an oxazine resin, wherein the ratio of G-band peak intensity to D-band peak intensity as measured by Raman spectrum is 1.5 or more, the average thickness of the coating layer is 50 nm or less, and the coefficient of variation (CV value) of the thickness of the coating layer is 7% or less.

Description

technical field [0001] The present invention relates to carbon-coated vanadium dioxide particles that can suppress sintering between particles during high-temperature firing, have high crystallinity and durability, and maintain excellent thermochromic properties even after long-term storage or use. In addition, the present invention also relates to a resin composition, a coating film, a film, an interlayer film for laminated glass, a laminated glass, and a film for sticking obtained by using the carbon-coated vanadium dioxide particles. Background technique [0002] Utilizing the thermochromic properties of vanadium dioxide, it has been proposed to use it as an automatic light-adjusting material that automatically blocks infrared rays (heat rays) at high temperatures in summer, and transmits infrared rays at low temperatures in winter, for example. Such an automatic light-adjusting material is expected to automatically adjust the temperature inside a car or a room when appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02C01G39/00C01G41/00C03C27/12C08L101/00C09K9/00C09D7/62
CPCC01G31/02C09K9/00B32B17/10036B32B17/1055C09D7/62B01J13/02B32B2264/107C01P2002/02C01P2004/04C01P2004/80C01P2006/32C01P2006/60C03C27/10C08J5/18C08J2300/22C08K3/04C08K3/22C08K9/02C09C1/0006C09D5/26C09D5/29C09D201/00
Inventor 孙仁德野里省二中寿贺章中村雅则永谷直之大鹫圭吾
Owner SEKISUI CHEM CO LTD
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