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A double-doped calcium aluminate type near-infrared reflective pigment and its preparation method

A reflective pigment, near-infrared technology, used in inorganic pigment processing, chemical instruments and methods, fibrous fillers, etc.

Active Publication Date: 2020-10-30
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually titanium dioxide as a white pigment has a high solar reflectance, but a single white color cannot meet people's visual aesthetic needs; moreover, most inorganic pigments contain a certain amount of toxic elements, such as Co, Pb, Cd and Cr etc.

Method used

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  • A double-doped calcium aluminate type near-infrared reflective pigment and its preparation method
  • A double-doped calcium aluminate type near-infrared reflective pigment and its preparation method

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Experimental program
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preparation example Construction

[0028] The present invention provides double-doped CaAl described in the above technical scheme 2 o 4 The preparation method of type near-infrared reflective pigment comprises the following steps:

[0029] (1) Ca(NO 3 ) 2 , Ce(NO 3 ) 3 , Al(NO 3 ) 3 , Fe(NO 3 ) 3 Mix with water, citric acid, and ethylene glycol to obtain a mixed solution;

[0030] (2) heating the mixed solution to obtain a sol;

[0031] (3) The sol is dried and calcined in sequence to obtain the double-doped CaAl 2 o 4 type near-infrared reflective pigments.

[0032] The present invention will Ca(NO 3 ) 2 , Ce(NO 3 ) 3 , Al(NO 3 ) 3 , Fe(NO 3 ) 3 Mix with water, citric acid, and ethylene glycol to obtain a mixed solution. In the present invention, the Ca(NO 3 ) 2 , Ce(NO 3 ) 3 , Al(NO 3 ) 3 and Fe(NO 3 ) 3 The molar ratio is preferably 28.3:5.0:(55.0-61.7):(5.0-11.7), more preferably 28.3:5.0:(58.0-60.0):(8.0-10.0). In the present invention, the Ca(NO 3 ) 2 Preferably Ca(NO 3 )...

Embodiment 1

[0040] Prepare according to the mole percentage of metal elements: Ca(NO 3 ) 2 4H 2 O is 28.3%, Ce(NO 3 ) 3 ·6H 2 O is 5%, Al(NO 3 ) 3 9H 2 O is 61.7%, Fe(NO 3 ) 3 9H 2 O is 5% mixed with water, the mass ratio of water and metal nitrate is 5:1, stirred until completely dissolved to obtain a mixed solution; then citric acid and ethylene glycol are added to the mixed solution, citric acid and the above metal The molar ratio of ions is 3:1, the molar ratio of ethylene glycol and citric acid is 2:3, stir until completely dissolved; then put the mixed solution into a water bath for water bath heating, the heating temperature is 60°C, and the heating time is 4h , to obtain a sol; then put the sol into an oven for drying at a drying temperature of 120° C. and a drying time of 12 hours to obtain a xerogel. Then grind the obtained xerogel and put it into a muffle furnace for calcination. Under the atmosphere of air, start to heat up from room temperature at a rate of 5°C / min...

Embodiment 2

[0042] Prepare according to the mole percentage of metal elements: Ca(NO 3 ) 2 4H 2 O is 28.3%, Ce(NO 3 ) 3 ·6H 2 O is 5%, Al(NO 3 ) 3 9H 2 O is 58.4%, Fe(NO 3 ) 3 9H 2O is 8.3% mixed with water, the mass ratio of water to metal nitrate is 6:1, stirred until completely dissolved to obtain a mixed solution; then citric acid and ethylene glycol are added to the mixed solution, citric acid and the above metal The molar ratio of ions is 3:1, the molar ratio of ethylene glycol and citric acid is 2:3, stir until completely dissolved; then put the mixed solution into a water bath for water bath heating, the heating temperature is 80°C, and the heating time is 2h , to obtain a sol; then put the sol into an oven for drying at a drying temperature of 110° C. and a drying time of 14 hours to obtain a xerogel. Then grind the obtained xerogel and put it into a muffle furnace for calcination. Under the atmosphere of air, start to heat up from room temperature at a rate of 5°C / min...

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Abstract

The invention provides a double-doped CaAl2O4 type near-infrared reflective pigment and relates to the technical field of inorganic oxide pigments. The provided pigment is a composite metal oxide, metal elements in the composite metal oxide include Ca, Al, Ce and Fe, and Ca, Ce, Al and Fe account for 28.3%, 5.0%, 55.0-61.7% and 5.0-11.7% of the total mole number of the metal elements respectively.The provided pigment is environmentally friendly and free of toxic substances, has the characteristic of color diversity and can be displayed in the color between yellow and brown in a visible lightband along with the change of the doping number of the metal elements, and the near-infrared reflectivity is high at the same time. The invention also provides a preparation method of the pigment. Thesol-gel preparation method is adopted, the process is simple, the pigment with high purity can be prepared at the relatively low temperature, and the method has the advantages that the reaction period is short and the reaction process is easy to control.

Description

technical field [0001] The invention relates to the technical field of inorganic oxide pigments, in particular to a double-doped CaAl 2 o 4 Type near-infrared reflective pigment and preparation method thereof. Background technique [0002] Today, due to the continuous consumption of natural resources, a large amount of greenhouse gases are produced, leading to global warming; More sunlight radiates energy, which in turn causes the "urban heat island" effect. The urban heat island effect makes the temperature in the city center 3-5°C higher than that in its surrounding areas. Since about half of the energy of solar radiation comes from near-infrared radiation, if the roof and exterior walls of a building use pigments with high near-infrared reflection, the temperature on the surface of the building can be effectively reduced, and accordingly, it will be transmitted to the building. The heat inside will also be reduced, which will reduce the cost of air conditioning and coo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/40C09C3/06
CPCC01P2002/32C09C1/407C09C3/06
Inventor 包维维邓志峰张少丹蒋鹏童婷
Owner SHAANXI SCI TECH UNIV
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