Ceramic pigment with high near-infrared reflectivity, and preparation method thereof

A ceramic pigment, high reflectivity technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve problems such as aging, achieve simple process, high near-infrared reflectivity, and be conducive to industrial application Effect

Active Publication Date: 2018-11-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating will age as the sun irradiates for a longer time, and the coating will no longer reflect sunlight.

Method used

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  • Ceramic pigment with high near-infrared reflectivity, and preparation method thereof
  • Ceramic pigment with high near-infrared reflectivity, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of near-infrared high-reflectivity ceramic pigments specifically includes the following process steps:

[0032] (1) Prepare 180 ml of water / alcohol solution ( V 水 : V 乙醇 = 1 : 5), then add 0.1 mole of tetraethyl orthosilicate, stir for 5 minutes, then add 0.3 mole of citric acid as a chelating agent, and use magnetic stirring at the same time to form a transparent sol;

[0033] (2) According to the chemical composition Nd 1.7 Fe 0.3 Si 2 o 7 Weigh neodymium nitrate and ferrous sulfate, fully dissolve them in 50 ml of deionized water, and add them to the transparent sol in step (1) in sequence, and stir thoroughly for 1 hour. The sol was then moved to a water bath at 90° C. and stirred for 1 hour, and then stirred continuously in an oil bath at 130° C. for 2 hours to obtain a xerogel.

[0034] (3) The dry gel was heat-treated at 1000°C for 3 hours, and then cooled, crushed, ground, pickled, washed with water and dried to obtain near-infrared high...

Embodiment 2

[0038] The preparation of near-infrared high-reflectivity ceramic pigments specifically includes the following process steps:

[0039] (1) Prepare 180 ml of water / alcohol solution ( V 水 : V 乙醇 = 1 : 3), then add 0.1 mole of sodium silicate, stir for 5 minutes, then add 0.5 mole of citric acid as a chelating agent, and use magnetic stirring at the same time to form a transparent sol;

[0040] (2) According to the chemical composition Nd 1.9 Fe 0.1 Si 2 o 7 Weigh neodymium sulfate and ferric chloride, fully dissolve them in 50 ml of deionized water, respectively, and add them to the transparent sol in step (1) in sequence, and fully stir for 2 hours. The sol was then moved to a water bath at 80° C. and stirred for 1 hour, and then stirred continuously in an oil bath at 120° C. for 1.5 hours to obtain a xerogel.

[0041] (3) The dry gel was heat-treated at 1300°C for 1 hour, and then cooled, crushed, ground, pickled, washed with water and dried to obtain a near-infrared ...

Embodiment 3

[0044] The preparation of near-infrared high-reflectivity ceramic pigments specifically includes the following process steps:

[0045] (1) Prepare 180 ml of water / alcohol solution ( V 水 : V 乙醇 = 1 : 4), then add 0.1 mole of sodium silicate, stir for 5 minutes, then add 0.4 mole of citric acid as a chelating agent, and use magnetic stirring to form a transparent sol;

[0046] (2) According to the chemical composition Nd 1.95 Fe 0.05 Si 2 o 7 Weigh neodymium chloride and ferrous nitrate, fully dissolve them in 50 ml of deionized water, and add them to the transparent sol in step (1) in sequence, and stir thoroughly for 1 hour. Then the sol was moved to a water bath at 85° C. and stirred for 1 hour, and then stirred continuously in an oil bath at 140° C. for 1 hour to obtain a xerogel.

[0047] (3) The dry gel was heat-treated at 1200°C for 2 hours, and then cooled, crushed, ground, pickled, washed with water and dried to obtain near-infrared high-reflectivity ceramic pigm...

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Abstract

The invention discloses a ceramic pigment with a high near-infrared reflectivity, and a preparation method thereof. Raw materials of the ceramic pigment comprise a soluble neodymium salt, a soluble iron salt and a soluble silicon source, and the chemical composition of the pigment is Nd2-xFexSi2O7, wherein x is not less than 0.05 and less than 0.6. The preparation method of the ceramic pigment ischaracterized in that the ceramic pigment with the high near-infrared reflectivity is obtained through a sol-gel combined combustion technology with citric acid as a chelating agent. The ceramic pigment has the characteristics of high near-infrared reflectivity and no toxic elements, and the preparation method has the advantages of simple process, no complicated device, and facilitation of industrial application.

Description

technical field [0001] The invention relates to the technical field of ceramic pigments, in particular to a near-infrared high-reflectivity ceramic pigment and a preparation method thereof. Background technique [0002] With the continuous development of urban construction, the urban environmental load is increasing day by day. Only because of the reduction of urban green space and the heat island effect formed by strong solar radiation, the temperature in the city center is about 3~5℃ higher than that in the surrounding areas. The heat accumulates on the surface of the building, increasing its own temperature, and at the same time transferring heat to the interior of the building, resulting in an increase in the indoor temperature, which in turn reduces the comfort of the living environment and increases the power consumption of air conditioning and cooling. The use of building exterior wall insulation technology is very effective in reducing heating energy consumption in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C3/04C09C3/00
CPCC01P2002/82C09C1/0009C09C3/006
Inventor 柯善军潘志东王燕民
Owner SOUTH CHINA UNIV OF TECH
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