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Tungsten-based oxide pigment with high near-infrared reflectivity and preparation method thereof

A technology of infrared reflection and oxide, which is applied in the field of inorganic pigments, can solve the problems of low near-infrared reflectivity and achieve the effects of simple process, easy industrialization, and low calcination temperature

Pending Publication Date: 2021-02-19
江西善纳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a green and non-toxic tungsten-based oxide pigment with simple preparation process, high near-infrared reflectivity, etc. oxide pigment

Method used

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  • Tungsten-based oxide pigment with high near-infrared reflectivity and preparation method thereof
  • Tungsten-based oxide pigment with high near-infrared reflectivity and preparation method thereof
  • Tungsten-based oxide pigment with high near-infrared reflectivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to La 2 W 1.9 Fe 0.1 o 9-σ Stoichiometric ratio, weighed 4.89 g La 2 o 3 Dissolve in 40ml dilute nitric acid to prepare rare earth nitrate solution; then weigh 7.06 grams of ammonium metatungstate (H 28 N 6 o 41 W 12 ) was dissolved in rare earth nitrate solution to form a mixed solution; then weighed 0.61 gram of Fe(NO 3 ) 3 9H 2 O and 7.66 grams of glycine (C 2 h 5 NO 2 ) dissolved in the mixed solution, continue heating and concentrating to a viscous state, and initiate a self-propagating combustion reaction at 400°C, and the combustion product is kept at 900°C in the air for 2 hours, and the pigment powder is obtained, and its visible light and near-infrared spectral reflection curves are as follows figure 1 As shown, the Lab value is as image 3 As shown, it has high reflectivity in the near-infrared band of 700-2500nm.

Embodiment 2

[0028] According to La 2 W 1.84 Fe 0.16 o 9-σ Stoichiometric ratio, weigh 6.50 g LaNO 3 ·6H 2 O was dissolved in 50ml of dilute nitric acid to prepare a rare earth nitrate solution; then 6.84 grams of ammonium metatungstate was dissolved in a rare earth nitrate solution to form a mixed solution; then 0.97 grams of Fe(NO 3 ) 3 9H 2 O and 11.53 grams of citric acid (C 6 h 8 o 7 ) dissolved in the mixed solution, continue heating and concentrating to a viscous state, and initiate a self-propagating combustion reaction at 500°C, and the combustion product is kept at 1000°C in the air for 1 hour, and the pigment powder is obtained, and its visible light and near-infrared spectral reflection curves are as follows: figure 2 As shown, the Lab value is as image 3 As shown, it has high reflectivity in the near-infrared band of 700-2500nm.

Embodiment 3

[0030] According to Sm 2 W 1.9 Fe 0.1 o 9-σ Stoichiometric ratio, weighed 5.23 g Sm 2 o 3 Dissolve in 50ml of dilute nitric acid to prepare a rare earth nitrate solution; then weigh 7.24 grams of ammonium metatungstate and dissolve it in a rare earth nitrate solution to form a mixed solution; then weigh 0.61 grams of Fe(NO 3 ) 3 9H 2 O and 8.11 grams of glycine (C 2 h 5 NO 2 ) dissolved in the mixed solution, continue heating and concentrating to a viscous state, and initiate a self-propagating combustion reaction at 600°C, and the combustion product is kept at 1000°C in air for 3 hours, and the pigment powder is obtained.

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Abstract

The invention discloses a tungsten-based oxide pigment with high near-infrared reflectivity and a preparation method thereof. The pigment is characterized in that the chemical composition general formula of the pigment is RE<2>W<2-x>A<x>O<9-sigma>, RE is one or two or more of La, Sm and Gd, A is one or two or more of Fe, Cr and Mo. The preparation method comprises the following steps: (1) weighingone of rare earth nitrate, rare earth oxide, rare earth hydroxide or rare earth carbonate according to the stoichiometric ratio of RE<2>W<2-x>A<x>O<9-sigma>, and preparing a rare earth nitrate solution; (2) weighing ammonium metatungstate, and adding the ammonium metatungstate into the rare earth nitrate solution obtained in the step (1); and (3) weighing one or two or more of ferric nitrate, chromium nitrate and ammonium molybdate and a proper amount of organic fuel, conducting dissolving in the mixed solution obtained in the step (2), heating the mixed solution, conducting concentrating toa viscous state, initiating self-propagating combustion, and calcining the combustion product in air at 700-1200 DEG C for 1-4 hours. The pigment powder which is bright in color, high in near-infraredreflectivity and environmentally friendly can be obtained, the equipment requirement is low, the process is simple, and the pigment powder can be widely applied to the fields of building outer walls,automobiles, airplanes, plastics and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic pigments, in particular to a pigment with high near-infrared reflectivity and a preparation method thereof. [0002] technical background [0003] With the rapid development of the country's economy and the rapid increase of the urban population, the number of buildings, cement roads and asphalt roads in the city center has increased, causing them to absorb a large amount of solar radiation heat, which in turn triggers the "heat island effect". The urban "heat island effect" will make the temperature in the city center 3-5°C higher than that in the surrounding areas, which will generate a lot of air-conditioning and cooling costs and greatly waste energy. About half of the ability of solar radiation comes from near-infrared (700-2500nm) radiation. If the exterior walls and roofs of buildings use pigments with high near-infrared reflectivity, it can effectively reduce the surface temperature of bu...

Claims

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Application Information

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IPC IPC(8): C01G49/00C01G41/00
CPCC01G49/0054C01G41/006
Inventor 周文武陈伟凡叶剑勇刘正王立中孙琦蒋绪川
Owner 江西善纳新材料科技有限公司