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Rare earth pigment with high near-infrared reflectivity and preparation method thereof

An infrared reflection and rare earth technology, applied in the field of inorganic pigments, can solve the problems of low near-infrared reflectivity, complex preparation process, and low lightness value, and achieve the effects of good color rendering, simple process, and easy industrialization

Pending Publication Date: 2021-02-23
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

[0006] The object of the present invention is to solve the problems of the existing near-infrared reflective pigments such as single color, complex preparation process, and low near-infrared reflectivity, and provide a green non-toxic pigment with simple preparation process, high near-infrared reflectivity, low lightness value, etc. the pigment

Method used

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  • Rare earth pigment with high near-infrared reflectivity and preparation method thereof
  • Rare earth pigment with high near-infrared reflectivity and preparation method thereof
  • Rare earth pigment with high near-infrared reflectivity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] According to Gd 3 Fe 4.8 Cr 0.2 o 12 Stoichiometric ratio, weighed 4.08 g Gd 2 o 3 , prepare 20ml of rare earth nitrate solution; then weigh 14.54 grams of Fe(NO 3 ) 3 9H 2 O was dissolved in rare earth nitrate solution to obtain a mixed solution; then weighed 0.6003 g of Cr(NO 3 ) 3 9H 2 O and 5.86 g glycine (C 2 h 5 NO 2 ) into the beaker containing the mixed solution, heated and stirred to dissolve the reactants completely, continue to heat and concentrate to a viscous state, and initiate a self-propagating combustion reaction at 500°C, and the combustion product is kept at 900°C in air for 3 hours to obtain Pigment powder.

Embodiment 2

[0031] According to Gd 3 Fe 4.7 Cr 0.3 o 12 Stoichiometric ratio, weigh 10.16 grams of Gd(NO 3 ) 3 ·6H 2 O, prepare 20ml of rare earth nitrate solution; then weigh 14.24 grams of Fe (NO 3 ) 3 9H 2 O was dissolved in the rare earth nitrate solution to obtain a mixed solution; then weighed 0.9003 g of Cr(NO 3 ) 3 9H 2 O and 7.45 grams of citric acid (C 6 h 8 o 7 ) into the beaker with the mixed solution, stir until completely dissolved, continue to heat, concentrate to a viscous state, trigger a self-propagating combustion reaction at 600 ° C, and the combustion product is kept at 1000 ° C in the air for 5 hours, and the pigment powder is obtained .

[0032] The X-ray powder diffraction pattern of the pigment of embodiment 1 and 2 is as follows figure 1 As shown, a single-phase garnet stable structure is obtained; figure 2 It is the visible light and near-infrared spectral reflectance curve of the pigment described in Examples 1 and 2 of the present invention; ...

Embodiment 3

[0034] According to Sm 3 Fe 4.6 Al 0.4 o 12 Stoichiometric ratio, weighed 3.92 g Sm 2 o 3 , prepare 20ml of rare earth nitrate solution; then weigh 13.94 grams of Fe(NO 3 ) 3 9H 2 O was dissolved in the rare earth nitrate solution to obtain a mixed solution; then weighed 1.13 grams of Al(NO 3 ) 3 9H 2 O and 5.41 grams of glycine (C 2 h 5 NO 2 ) into the beaker with the mixed solution, stir until completely dissolved, continue to heat and concentrate to a viscous state, trigger a self-propagating combustion reaction at 400 ° C, and the combustion product is kept at 1100 ° C in the air for 4 hours, and the pigment powder is obtained .

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Abstract

A rare earth pigment with high near-infrared reflectivity and a preparation method thereof are disclosed and are characterized in that the general chemical composition formula of the pigment is RE3Fe5xMxO12, RE is one or more of Y, Sm, Gd and Eu, M is one or more of Al, Cr and Mn, and the preparation method comprises the following steps: (1) weighing one of rare earth nitrate, rare earth oxide andrare earth hydroxide according to the stoichiometric ratio of RE3Fe5xMxO12, and preparing a rare earth nitrate solution, (2) weighing one of ferric oxide, ferric nitrate or ferric carbonate, and adding the rare earth nitrate solution obtained in the step (1), and (3) weighing one or more than two of aluminum nitrate, chromium nitrate and manganese nitrate and a proper amount of organic fuel, dissolving into the mixed solution obtained in the step (2), heating the mixed solution, concentrating to a viscous state, initiating self-propagating combustion, and calcining a combustion product in air. The pigment powder which is stable in structure, deep in color, high in near-infrared reflectivity, green and non-toxic can be obtained, the preparation process is simple, the equipment requirementis low, and the pigment powder can be widely applied to the fields of building outer walls, automobiles, oil-gas storage tanks and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic pigments, in particular to a rare earth pigment with high near-infrared reflectivity and a preparation method thereof. [0002] technical background [0003] In recent years, with the implementation of the country's policy of promoting energy conservation and environmental protection, people's awareness of energy conservation has been continuously improved, especially building energy conservation, which has received increasing attention. Colored pigments with high near-infrared reflectivity can not only effectively reduce the temperature of urban buildings, but also satisfy people's pursuit of color, so they are widely used in architectural coatings. At present, the widely used heat insulation coatings can be divided into barrier heat insulation coatings, reflective heat insulation coatings and radiation heat insulation coatings according to their heat insulation mechanism differences, among whic...

Claims

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Application Information

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IPC IPC(8): C01G49/00
CPCC01G49/009C01P2002/72C01P2006/62C01P2006/63C01P2006/64C01P2002/84
Inventor 周文武陈伟凡王立中叶剑勇刘正孙琦蒋绪川
Owner 江西善纳新材料科技有限公司
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