Tungsten-containing metal oxide nanoparticle dispersoid and preparation method thereof

A nanoparticle and oxide technology, applied in chemical instruments and methods, dyed organosilicon compound treatment, dyed low-molecular-weight organic compound treatment, etc. The problems of uneven secondary particle size and unstable dispersion quality can achieve the effect of narrow secondary particle size distribution, simple and easy operation method, and easy industrial production.

Inactive Publication Date: 2017-08-22
XIAMEN NANOTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing dispersions start from dry powder and are prepared by physical grinding methods, such as ball milling or sand milling. Physical grinding methods will inevitably introduce impurities, and after the nanoparticles are dried, hard agglomerates are formed between the particles. It is difficult to destroy this agglomeration by physical methods, resulting in uneven secondary particle size of the redispersed particles, resulting in low efficiency of the dispersion preparation method by physical grinding and unstable dispersion quality. The above factors will eventually lead to solar insulation The transparency and barrier properties of the film cannot meet the requirements

Method used

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  • Tungsten-containing metal oxide nanoparticle dispersoid and preparation method thereof
  • Tungsten-containing metal oxide nanoparticle dispersoid and preparation method thereof
  • Tungsten-containing metal oxide nanoparticle dispersoid and preparation method thereof

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preparation example Construction

[0049] Please refer to figure 1 , the preparation method comprises the following steps:

[0050] Step S101: providing a precursor of tungsten oxide and a precursor of doped metal, wherein the doped metal is selected from one or more of group IA-VA metals and transition metals.

[0051] In one embodiment, the precursors of tungsten oxide include but are not limited to ammonium metatungstate, ammonium orthotungstate, ammonium paratungstate, tungstic acid, tungsten silicide, tungsten sulfide, tungsten oxychloride, tungsten hexachloride, tungsten tetrachloride , tungsten bromide, tungsten fluoride, tungsten carbide, tungsten oxycarbide, the aforementioned substances can also be used in combination, preferably ammonium metatungstate, ammonium orthotungstate, ammonium paratungstate, tungstic acid.

[0052] In one embodiment, doping metals include but are not limited to lithium, sodium, potassium, rubidium, cesium, aluminum, indium, gallium, tin, manganese, iron, cobalt, nickel, Co...

Embodiment 1

[0140] Add 200g of tungstic acid, 113g of cesium hydroxide, 833g of citric acid, and 50g of aspartic acid into a mixture of 1067mL of water and 267mL of ethanol to form a reaction slurry, which is reacted in a high-pressure reactor capable of raising and controlling temperature , under stirring, at a rate of 3°C / min, the temperature was gradually raised to 300°C, and kept at this temperature for 12 hours, and then forced to cool down to room temperature. Then take out the slurry, centrifuge the slurry to remove impurity ions in the slurry; disperse the obtained filter cake in 500mL water, and then centrifuge; redisperse the obtained filter cake in 500mL ethanol, then centrifuge and wash with ethanol The process is carried out twice, and the obtained filter cake can be directly dried and crushed to obtain a dry powder product.

[0141] Please refer to Figure 7 , using a scanning electron microscope (SEM) to observe the morphology and structure of the nanoparticle, it can be s...

Embodiment 2

[0149] 200g tungstic acid, 113g cesium hydroxide, 551g citric acid, 11.5g sodium borohydride (NaBH4 ), was added to a mixture of 1067mL water and 267mL ethanol, or 1334mL water to form a reaction slurry, which was reacted in a high-pressure reactor capable of raising temperature and controlling temperature, and was stirred at 3°C / min Gradually raise the temperature to 300°C, keep it at this temperature for 12 hours, and then forcefully cool it down to room temperature. Then take out the slurry, centrifuge the slurry to remove impurity ions in the slurry; disperse the obtained filter cake in 500mL water, and then centrifuge; redisperse the obtained filter cake in 500mL ethanol, then centrifuge and wash with ethanol The process is carried out twice, and the obtained filter cake can be directly dried and crushed to obtain a dry powder product.

[0150] The resulting nanoparticles are cesium-containing tungsten oxide crystals with the molecular formula Cs 0.3 WO 3 , the crystal ...

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Abstract

The invention provides a tungsten-containing metal oxide nanoparticle dispersoid and a preparation method thereof. The preparation method comprises providing slurry comprising a solvent and tungsten-containing metal oxide nanoparticles dispersed in the solvent, adding a surface modifier to the slurry, carrying out a reaction process until the reaction is finished, separating the tungsten-containing metal oxide nanoparticles subjected to surface treatment in the slurry, and re-dispersing the tungsten-containing metal oxide nanoparticles in the preset solvent so that the tungsten-containing metal oxide nanoparticle dispersoid is obtained. The method for forming the dispersoid through a wet surface treatment method is free of nanoparticle drying and can directly modify the particle surface in the liquid phase so that hard aggregation of the particles is avoided, is simple and easy in operation and can be easily industrialized. The dispersoid obtained by the preparation method has high solid content, a high degree of dispersion, narrow secondary particle size distribution and average secondary particle diameter of 30 to 100 nm.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a tungsten-containing metal oxide nanoparticle dispersion and a preparation method thereof. Background technique [0002] Glass is increasingly used in modern buildings to improve the landscape and visual effects. At the same time, glass is also widely used as windows in cars and trains. On the one hand, glass improves the user experience, but on the other hand, due to sunlight, it increases the heat transmitted into the room and the car, and the temperature rises, especially in summer, which will significantly increase the power consumption of the air conditioner and Energy consumption. In order to reduce energy consumption, more and more building glass and car window glass begin to use thermal insulation film. [0003] At present, a variety of heat insulation film products have appeared on the market, and the heat insulation materials used mainly include ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D183/04C08J7/04C09C1/02C09C3/08C09C3/12C03C17/00
CPCC03C17/009C08J7/042C08J2367/02C08J2483/04C08K3/22C08K9/06C08K2003/2258C08K2201/003C08K2201/011C09C1/02C09C3/006C09D183/04
Inventor 张纪尧钟杰李海霞杨程
Owner XIAMEN NANOTECH
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