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A doped yellow near-infrared reflective pigment and its preparation method

A reflective pigment and near-infrared technology, applied in chemical instruments and methods, inorganic chemistry, molybdenum compounds, etc., can solve problems such as causing cancer, polluting the environment, and affecting health

Active Publication Date: 2021-06-15
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Inorganic near-infrared reflective pigments have the advantages of high temperature resistance, corrosion resistance and weather resistance, and are widely used in various fields of industry. However, traditional inorganic near-infrared reflective yellow pigments such as lead cadmium yellow (PbCrO 4 ), cadmium yellow (CdS), bismuth vanadate (BiVO 4 ) and cadmium stannate (CdSnO 3 ) and so on contain toxic metal elements such as Cr, Bi, V, etc. These toxic elements not only pollute the environment, but also accumulate in the human body after entering the human body, thereby affecting health and even causing cancer

Method used

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  • A doped yellow near-infrared reflective pigment and its preparation method
  • A doped yellow near-infrared reflective pigment and its preparation method

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preparation example Construction

[0033] The invention provides a preparation method for the above-mentioned doped yellow near-infrared reflective pigment, comprising the following steps:

[0034] (1) dissolving bismuth nitrate and lanthanum nitrate in acetic acid solution and mixing to obtain A solution;

[0035] (2) Sodium vanadate and sodium molybdate are dissolved in water to obtain B solution;

[0036] (3) Mixing the A solution and the B solution, adding urea and a surfactant to carry out a hydrothermal reaction to obtain a doped yellow near-infrared reflective pigment;

[0037] The steps (1) and (2) are not limited by time sequence.

[0038] In the present invention, bismuth nitrate and lanthanum nitrate are dissolved in acetic acid solution to obtain A solution. In the present invention, the acetic acid solution is preferably glacial acetic acid, and the mass ratio of the total mass of bismuth nitrate and lanthanum nitrate to the acetic acid solution is preferably 1:25-30, more preferably 1:26-28. In...

Embodiment 1

[0048] Prepare Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O, Na 3 VO 4 and Na 2 MoO 4 2H 2 O raw material, wherein, Bi accounts for 45.0% of the total molar weight of metal elements, La accounts for 2.5% of the total molar weight of metal elements, V accounts for 45.0% of the total molar weight of metal elements, Mo accounts for 5.0% of the total molar weight of metal elements, Na Accounting for 2.5% of the total molar weight of metal elements, the chemical composition of the pigment is expressed as: Bi 0.9 (Na 0.5 La 0.5 ) 0.1 V 0.9 Mo 0.1 o 4 .

[0049] The preparation steps are as follows:

[0050] (1) Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O was dissolved in glacial acetic acid, the mass ratio of glacial acetic acid to nitrate was controlled to be 25:1, heated in a water bath at 90°C until all the salts were completely dissolved, and A solution was obtained;

[0051] (2) Na 3 VO 4 and Na 2 MoO 4 2H 2 O is dissolved in distilled water to obtain B so...

Embodiment 2

[0057] Prepare Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O, Na 3 VO 4 and Na 2 MoO 4 2H 2 O raw material, wherein, Bi accounts for 35.0% of the total molar weight of metal elements, La accounts for 7.5% of the total molar weight of metal elements, V accounts for 35.0% of the total molar weight of metal elements, Mo accounts for 15.0% of the total molar weight of metal elements, Na Accounting for 7.5% of the total molar weight of metal elements, the chemical composition of the pigment is expressed as: Bi 0.9 (Na 0.5 La 0.5 ) 0.1 V 0.9 Mo 0.1 o 4 .

[0058] The preparation steps are as follows:

[0059] (1) Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 Dissolve O in glacial acetic acid, control the mass ratio of glacial acetic acid to nitrate to 30:1, heat in a water bath at 90°C until all the salts are completely dissolved, and obtain A solution;

[0060] (2) Na 3 VO 4 and Na 2 MoO 4 2H 2 O is dissolved in distilled water to obtain B solution;

[0061] (3) M...

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Abstract

The invention provides a doped yellow near-infrared reflective pigment and a preparation method thereof, belonging to the technical field of inorganic oxide pigments. Pigment chemical general formula provided by the invention is Bi 1‑x (Na 0.5 La 0.5 ) x V 1‑y Mo y o 4 , wherein x=0.1~0.5, y=0.1~0.5. The present invention utilizes La 3+ Ion substitution BiVO 4 Part of Bi in 3+ ion, Mo 6+ Ion substitution BiVO 4 part of the V 5+ Ions can reduce the amount of Bi and V elements, and reduce the content of toxic metal elements in pigments; while using La and Mo to BiVO 4 Doping is carried out to tune the color of the pigment, so that the color of the pigment is richer and the near-infrared reflectance is high. The invention provides a method for preparing the above-mentioned doped yellow near-infrared reflective pigment. The method has simple reaction steps and is easy to operate. The obtained pigment has complete crystal form, low degree of agglomeration and strong coloring ability.

Description

technical field [0001] The invention relates to the technical field of inorganic oxide pigments, in particular to a doped yellow near-infrared reflective pigment and a preparation method thereof. Background technique [0002] Near-infrared reflective pigments can not only absorb light in the visible region, so as to present a certain color to meet people's visual aesthetic needs, but also reflect part of the radiation in the near-infrared region, reduce heat accumulation, and play a role in heat insulation and cooling. Applying near-infrared reflective pigments to roofs and exterior walls of buildings can reduce the use of air conditioners and increase the comfort level of buildings. [0003] Inorganic near-infrared reflective pigments have the advantages of high temperature resistance, corrosion resistance and weather resistance, and are widely used in various fields of industry. However, traditional inorganic near-infrared reflective yellow pigments such as lead cadmium ye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/00
Inventor 包维维郝晓丽李雷权袁新强
Owner SHAANXI SCI TECH UNIV
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