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Method for improving near-infrared reflectivity of yellow pigment

A yellow pigment and near-infrared technology, applied in chemical instruments and methods, preparation/processing of rare earth metal compounds, inorganic chemistry, etc., can solve the problems of large differences and little reference value of preparation methods, etc., and achieve good heat insulation performance , Improve the effect of near-infrared reflectivity

Pending Publication Date: 2022-05-13
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the heat-insulating inorganic material described in the above-mentioned patent documents is quite different from the present invention, and the reference value of its preparation method is not large.

Method used

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  • Method for improving near-infrared reflectivity of yellow pigment
  • Method for improving near-infrared reflectivity of yellow pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Prepare an aqueous solution of cerium chloride with a concentration of 1 mol / L. According to the yellow pigment Bi 1.75 Y 0.25 Ce 2 o 7 In the mol ratio of Y, Bi and Ce, yttrium chloride aqueous solution (concentration is 2.63mol / L) and bismuth chloride are added in the cerium chloride solution, obtain the solution containing metal element (in the solution containing metal element, cerium element as a benchmark, the molar concentration of cerium chloride is 0.975mol / L).

[0054] Prepare an aqueous ammonium bicarbonate solution with a concentration of 2 mol / L.

[0055] At 80°C, the ammonium bicarbonate aqueous solution was added dropwise to the solution containing metal elements at a feeding rate of 45mL / min for reaction, and the dropwise addition was stopped until the pH value of the reaction system was 6.7, and the reaction was continued for 0.5h to obtain a reaction solution , the pH value of the reaction solution was 6.7.

[0056] The reaction solution was filt...

Embodiment 2

[0058] The only difference from Example 1 is that the feeding rate of the ammonium bicarbonate aqueous solution is 50mL / min. The near-infrared reflectance results of the obtained yellow pigment are shown in Table 1.

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Abstract

The invention discloses a method for improving the near-infrared reflectivity of a yellow pigment, the chemical composition of the yellow pigment is Bi < 2-x > Y < x > Ce < 2 > O < 7 >, x is equal to 0.2-1.0, the method comprises the following steps: (1) at 70-85 DEG C, dropwise adding an ammonium bicarbonate aqueous solution into a metal element-containing solution at a feeding speed of 35-65 mL/min for reaction to obtain a reaction solution, and controlling the pH value of the reaction solution to be 6.6-7.2; (2) carrying out post-treatment on the reaction liquid to obtain a precursor; and burning the precursor to obtain the yellow pigment, wherein the solution containing the metal elements is an aqueous solution containing metal ions; the metal element-containing solution is prepared from bismuth-containing inorganic salt, yttrium-containing inorganic salt and cerium-containing inorganic salt according to the molar ratio of Bi to Y to Ce in the yellow pigment. The method disclosed by the invention is beneficial to improving the near-infrared reflectivity of the yellow pigment and improving the heat-insulating property of the yellow pigment.

Description

technical field [0001] The invention relates to a method for improving the near-infrared reflectivity of yellow pigments. Background technique [0002] Pigment is the main component that gives the paint its color, and its reflectivity directly affects the heat insulation performance of the coating. The level of near-infrared reflectance is an important indicator for judging the heat insulation performance of pigments. [0003] Studies have shown that lanthanide inorganic pigments have excellent chemical stability and thermal stability, and are relatively promising optical materials. For example, the yellow pigment Bi 2-x Y x Ce 2 o 7 (x=0.2~1.0). It is reported in the literature that the yellow pigment is obtained by drying and mixing related metal ion oxides, grinding, granulating, and finally calcining the material at 1000° C. and grinding for multiple times. However, this method relies on mechanical mixing, which easily causes uneven mixing of raw materials, low pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/32C01F17/10
CPCC01F17/32C01F17/10C01P2002/72C01P2006/60
Inventor 侯晓玲崔建国郝先库蔚腊先李雪菲陈禹夫高婷张升强王新宇李俊林孙书鹏
Owner BAOTOU RES INST OF RARE EARTHS
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