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an aluminum doped cr 2 o 3 High infrared reflective material and preparation method thereof

A technology of infrared reflection and aluminum doping, applied in the direction of chromium oxide/hydrate, etc., can solve the problems of high calcination temperature, difficult to mix materials evenly, etc., and achieve the effect of high infrared reflectivity

Active Publication Date: 2021-03-23
WUHAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to overcome above-mentioned technical deficiency, proposes a kind of aluminum-doped Cr 2 o 3 The high infrared reflective material and its preparation method solve the technical problems that the existing doping method in the prior art is not easy to mix the materials evenly and the calcination temperature is high

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  • an aluminum doped cr <sub>2</sub> o <sub>3</sub> High infrared reflective material and preparation method thereof
  • an aluminum doped cr <sub>2</sub> o <sub>3</sub> High infrared reflective material and preparation method thereof
  • an aluminum doped cr <sub>2</sub> o <sub>3</sub> High infrared reflective material and preparation method thereof

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[0025] Such as figure 1 , figure 1 is the aluminum doped Cr provided by the present invention 2 o 3 A process flow diagram of an embodiment of a method for preparing a high infrared reflective material. For the first solution of the present invention, the present invention provides an aluminum-doped Cr 2 o 3 The preparation method of high infrared reflection material comprises the following steps:

[0026] Disperse the chromium salt and the aluminum salt in water in turn, and stir to obtain solution A;

[0027] Disperse citric acid and ethylene glycol in water in turn, and carry out stirring reaction to obtain solution B;

[0028] Add the above-mentioned solution B dropwise to the above-mentioned solution A, after heat preservation and stirring, heating and stirring, and heat preservation and standing, a wet gel is obtained;

[0029] After the above wet gel was dried, ground and calcined, the Al-doped Cr 2 o 3 Highly infrared reflective material.

[0030] In the pres...

Embodiment 1

[0049] Cr(NO 3 ) 3 9H 2 O(23.69g, 0.0592mol), Al(NO 3 ) 3 9H 2 O (6.66g, 0.0177mol) was added into 35ml of deionized water, and stirred at 60°C for 1.5h to obtain solution A;

[0050] Will C 6 h 8 o 7 ·H 2 Add O (16.1963g, 0.0769mol), ethylene glycol (7.17ml, 0.1155mol) into 10ml deionized water, stir at room temperature for 1.5h, and obtain solution B;

[0051] Add solution B dropwise to solution A with a dropper, and continue to stir at 60°C for 7 hours to form a sol, then raise the temperature to 80°C under stirring conditions, and keep it for 1.5 hours to obtain a wet gel;

[0052] Take the wet gel out and put it in an oven at 70°C, take it out after 4 days, grind it into precursor powder, put the precursor powder in a muffle furnace set at 800°C for calcination, and the heating rate is 8°C / min , the holding time is 4h, and the aluminum-doped Cr 2 o 3 Highly infrared reflective material. In this embodiment, the molar ratio of aluminum salt to chromium salt is ...

Embodiment 2

[0054] Cr(NO 3 ) 3 9H 2 O(23.69g, 0.0592mol), Al(NO 3 ) 3 9H 2 O (6.66g, 0.0177 mol) was added into 35ml of deionized water and stirred at 60°C for 1.5h to obtain solution A;

[0055] Will C 6 h 8 o 7 ·H 2 Add O (16.1963g, 0.0769mol), ethylene glycol (7.17ml, 0.1155mol) into 10ml deionized water, stir at room temperature for 1.5h, and obtain solution B;

[0056] Add solution B dropwise to solution A with a dropper, and continue to stir at 60°C for 7 hours to form a sol, then raise the temperature to 80°C under stirring conditions, and keep it for 1.5 hours to obtain a wet gel;

[0057] Take the wet gel out and put it in an oven at 70°C, take it out after 4 days, grind it into a precursor powder, put the precursor powder in a muffle furnace set at 900°C for calcination, and the heating rate is 8°C / min, The holding time is 4h, and the aluminum-doped Cr 2 o 3 Highly infrared reflective material. In this embodiment, the molar ratio of aluminum salt to chromium salt is...

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Abstract

The invention discloses an aluminum-doped Cr2O3 high-infrared reflection material and a preparation method thereof, wherein the preparation method of the aluminum-doped Cr2O3 high-infrared reflectionmaterial comprises the following steps: sequentially dispersing chromium salt and aluminum salt into water, and stirring to obtain a solution A; sequentially dispersing citric acid and ethylene glycolinto water, and carrying out stirring reaction to obtain a solution B; dropwise adding the solution B into the solution A, and carrying out heat-preservation stirring, heating stirring and heat-preservation standing to obtain wet gel; and drying, grinding and calcining the wet gel to obtain the aluminum-doped Cr2O3 high-infrared reflection material. According to the invention, the mixture obtained by the sol-gel method does not influence the mixing uniformity due to material layering caused by different precipitation rates of respective materials in the subsequent standing process; meanwhile,the temperature required in the calcining process is relatively low; the aluminum-doped Cr2O3 high-infrared-reflection material obtained by the preparation method disclosed by the invention is greenand has relatively high infrared reflectivity.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic materials, in particular to an aluminum-doped Cr 2 o 3 High infrared reflective material and its preparation method. Background technique [0002] Today, with the development of large-scale urbanization around the world, more and more plants around buildings are being removed and replaced by tall buildings. The resulting heat island effect has gradually attracted public attention. The heat island effect means that due to the acceleration of urbanization, dense urban buildings, asphalt roads and cement roads absorb heat faster than suburban soil and vegetation, and have a smaller heat capacity, so that the temperature in the urban area is generally higher than that in the surrounding suburbs at the same time. Surrounded by low-temperature suburbs, it is like an island phenomenon in the vast ocean. The heat island effect makes the temperature around the building 10℃ higher than t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/02
CPCC01G37/02C01P2002/72C01P2002/82
Inventor 王玉成李星星傅正义王为民王皓张金咏张帆
Owner WUHAN UNIV OF TECH
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