Graphene-containing vanadium dioxide composite powder and preparation method and application thereof

A vanadium dioxide, composite powder technology, applied in epoxy resin coatings, coatings, reflection/signal coatings, etc., can solve problems such as poor absorption or reflection effect

Inactive Publication Date: 2018-04-17
广东华材实业股份有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] Based on this, it is necessary to provide a graphene-containing vanadium dioxide composite powder and its preparation metho...

Method used

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  • Graphene-containing vanadium dioxide composite powder and preparation method and application thereof
  • Graphene-containing vanadium dioxide composite powder and preparation method and application thereof
  • Graphene-containing vanadium dioxide composite powder and preparation method and application thereof

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preparation example Construction

[0056] see figure 2 , the preparation method of the vanadium dioxide composite powder containing graphene of one embodiment, comprises the following steps:

[0057] S110, preparing vanadium dioxide particles.

[0058] In one of the embodiments, the step of preparing vanadium dioxide particles specifically includes:

[0059] S111, adding an alkaline reagent to the tetravalent vanadium ion aqueous solution to obtain a vanadium-containing precursor.

[0060] In one of the embodiments, the anion in the tetravalent vanadium ion aqueous solution is SO 4 2- , Cl - and C 2 o 4 2- at least one of the

[0061] In one of the embodiments, the alkaline reagent is selected from at least one of ammonia water, sodium hydroxide and potassium hydroxide. Preferably, the alkaline reagent is formulated into an aqueous solution and then added to the tetravalent vanadium ion aqueous solution.

[0062] In one embodiment, the concentration of tetravalent vanadium ions in the aqueous solutio...

Embodiment 1

[0090] (1) take by weighing the tetravalent vanadium ion aqueous solution of 10g, wherein the concentration of tetravalent vanadium ion is 0.8mol / L; Then add the basic reagent containing 10g sodium hydroxide to it and mix uniformly to obtain the vanadium-containing precursor; The vanadium precursor is placed in a high-pressure reactor, and reacted for 20 hours at 150° C. and a pressure of 1 MPa; then the product is filtered, washed and dried to obtain vanadium dioxide particles. The particle size of the prepared vanadium dioxide particles is 100nm.

[0091] (2) Weigh 4L of AuCl 3 solution, where AuCl 3 The concentration of the solution is 0.01mol / L; 5g of graphene is added thereto, and the graphene is dispersed uniformly by ultrasonic and stirring. Among them, the surface size of graphene is 1μm, the thickness of graphene is 0.5nm, and the specific surface area of ​​graphene is 10m 2 / g. The power of ultrasonic dispersion is 50Hz, the rotation speed of stirring is 200r / min...

Embodiment 2

[0096] (1) Take by weighing 100g of tetravalent vanadium ion aqueous solution, wherein the concentration of tetravalent vanadium ion is 0.02mol / L; then add alkaline reagent containing 10g ammonia water and mix uniformly to obtain vanadium-containing precursor; the above-mentioned vanadium-containing precursor The body was placed in a high-pressure reactor, and reacted at 300° C. and a pressure of 10 MPa for 4 hours; then the product was filtered, washed and dried to obtain vanadium dioxide particles. The particle size of the prepared vanadium dioxide particles is 200nm.

[0097] (2) Weigh 3L of AgNO 3 solution, where AgNO 3 The concentration of the solution is 0.05mol / L; 10g of graphene is added thereto, and the graphene is uniformly dispersed by ultrasonic and stirring. Among them, the surface size of graphene is 100μm, the thickness of graphene is 50nm, and the specific surface area of ​​graphene is 1000m 2 / g. The power of ultrasonic dispersion is 20Hz, the rotational s...

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Abstract

The invention relates to a graphene-containing vanadium dioxide composite powder and a preparation method and application thereof. The graphene-containing vanadium dioxide composite powder consists ofcore-shell particles and graphene dispersed between the core-shell particles, each core-shell particle consists of a vanadium dioxide particle and metal, the metal wraps the surface of the vanadium dioxide to form a metal shell, and the mass ratio of the vanadium dioxide particles, the metal and the graphene is (70 to 98) to (1 to 20) to (1 to 10). Through the synergistic effect of the metal shells and the graphene of the graphene-containing vanadium dioxide composite powder, the high conductivity of the graphene-containing vanadium dioxide composite powder can be achieved, and the electron transfer capability and infrared transmission and reflection capability of the graphene-containing vanadium dioxide composite powder are increased. When temperature increases, plasma resonance is generated inside the vanadium dioxide particles, a conductive network formed by the vanadium dioxide particles, the metal shells and the graphene carries out the total reflection of infrared light, at themoment, the transmission and absorption of infrared rays can be greatly reduced, consequently, temperature rise is decreased, and the objective of energy saving is achieved.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a graphene-containing vanadium dioxide composite powder and a preparation method and application thereof. Background technique [0002] Due to the increasing depletion of global resources, energy conservation and emission reduction has become the current top priority for all countries. It is estimated that building energy consumption accounts for more than 1 / 3 of the total energy consumption in society. Therefore, building energy conservation is the key to reducing energy consumption. Since a large part of building energy consumption is used for air conditioning, and more than half of the energy consumption of air conditioning is energy loss through the heat exchange between windows and the outside world, so by promoting energy saving in buildings and developing energy-saving glass, it is expected to significantly reduce greenhouse gas emissions and energy consumpt...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D133/00C09D167/00C09D175/04C09D167/08C09D163/00C09D5/33C08J7/04C08L23/12C08L23/06C08L77/00C08L27/06C08L67/02C08L33/12
CPCC08J7/0427C08J2323/06C08J2323/12C08J2327/06C08J2333/12C08J2367/02C08J2377/00C08J2483/04C09D5/004C09D183/04C08K9/02C08K3/22C08K3/04
Inventor 戴雷唐子奉王亚文唐知桥冯强郑剑雄袁想平
Owner 广东华材实业股份有限公司
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