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Preparation method of bismuth hydroxide

A technology of bismuth hydroxide and bismuth oxide, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, inorganic chemistry, etc. Unstable catalytic performance and other problems, to achieve the effect of improving catalytic performance, small particle size, and narrow particle size distribution

Active Publication Date: 2013-05-22
FIRST RARE MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the catalytic performance in the bismuth hydroxide obtained in this way is unstable, and the impurities are easy to be on the high side, especially the content of iron ions, chloride ions, and sodium ions. These impurities will affect the stability of the cathodic electrophoretic paint in storage, and In cathodic electrophoretic paint system, with the progress of electrophoresis, impurity ions will be continuously enriched in the bath solution, which will also affect the quality of electrophoretic film formation

Method used

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  • Preparation method of bismuth hydroxide
  • Preparation method of bismuth hydroxide
  • Preparation method of bismuth hydroxide

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preparation example Construction

[0023] A basic preparation method of bismuth hydroxide of the present invention, the method steps are,

[0024] (1) Solution preparation

[0025] bismuth oxide Bi 2 o 3 and concentrated nitric acid with a concentration above 10mol / L to prepare a concentration of 0.15~2mol / LBi(NO 3 ) 3 solution;

[0026] Use ammonia water and deionized water with a mass content of more than 25wt% to prepare an ammonia solution with a mass content of 2wt%~25wt%, wherein the ammonia solution contains NH 4 + with Bi 3+ molar ratio to NH 4 + : Bi 3+ =3~12:1;

[0027] Add dispersant to deionized water to obtain dispersant solution, dispersant addition is relative to bismuth oxide Bi 2 o 3 The mass percentage of the added amount is 0.001%~5%;

[0028] (2) Pre-precipitation

[0029] Under stirring conditions, to bismuth nitrate Bi(NO 3 ) 3 Add the above dispersant solution to the solution, and add bismuth nitrate Bi(NO 3 ) 3 The mass added to the solution is bismuth nitrate Bi(NO 3...

Embodiment 1

[0040] Add one or more of 0.005g of polyethylene glycol, polyvinyl alcohol, propanol, glycerin, sodium dodecylsulfonate, and cetyltrimethylammonium bromide into 50ml of deionized water to prepare a dispersion dispersant solution, the amount of dispersant added relative to bismuth oxide Bi 2 o 3 The added amount is 0.001%;

[0041] 466g bismuth oxide Bi 2 o 3 Be dissolved in the concentrated nitric acid of 621ml65wt%, add above-mentioned dispersant solution and deionized water and be mixed with the bismuth nitrate Bi(NO of 0.15mol / L 3 ) 3 solution;

[0042] 780ml ammoniacal liquor is mixed with deionized water and is mixed with the ammoniacal solution that concentration is 25wt%;

[0043] Add the prepared ammonia solution to bismuth nitrate Bi(NO 3 ) 3solution, the flow rate of the ammonia solution is 3000m / min, when the pH value of the solution is adjusted to 0.5, stop adding the ammonia solution, continue to stir for 10h, after standing for precipitation, pour out the...

Embodiment 2

[0047] Add one or more of 0.045g of polyethylene glycol, polyvinyl alcohol, propanol, glycerin, sodium dodecylsulfonate, and cetyltrimethylammonium bromide to 50ml of deionized water to prepare a dispersion dispersant solution, the amount of dispersant added relative to bismuth oxide Bi 2 o 3 The added amount is 0.01%;

[0048] 466g bismuth oxide Bi 2 o 3 Dissolve in the concentrated nitric acid of 621ml65wt%, add above-mentioned dispersant solution and deionized water and be mixed with bismuth nitrate Bi(NO 3 ) 3 solution;

[0049] 780ml ammoniacal liquor is mixed with deionized water and is mixed with the ammoniacal solution that concentration is 10wt%;

[0050] Add the prepared ammonia solution to bismuth nitrate Bi(NO 3 ) 3 solution, the flow rate of the ammonia solution is 10ml / min, adjust the pH value of the solution to 3, stop adding the ammonia solution, continue to stir for 2h, after standing for precipitation, pour out the supernatant, continue to add deioniz...

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Abstract

The invention discloses a preparation method of bismuth hydroxide; the preparation method comprises the following steps of: firstly, confecting bismuth nitrate Bi(NO3)3 solution, ammonia water solution and dispersing agent solution; then adding the dispersing agent solution into the bismuth nitrate Bi(NO3)3 solution, stirring, adding water to dilute the bismuth nitrate Bi(NO3)3 solution, adding ammonia water solution to adjust the pH (potential of hydrogen) of the bismuth nitrate Bi(NO3)3 solution, stirring, filtering, depositing and washing pre-precipitating at the end of the reaction; confecting the washed pre-precipitate to be suspension, keeping on adding ammonia water solution to adjust the pH, stirring; sanding and ageing after the reaction, washing, separating and drying bismuth nitrate Bi(NO3)3 precipitate after ageing, so as to obtain dry bismuth hydroxide Bi(OH)3 powder, carrying out fluid energy milling on the dry powder, thus obtaining the bismuth hydroxide Bi(OH)3 product. The bismuth hydroxide prepared by the method is low in impurity content and is excellent in catalyzing property.

Description

technical field [0001] The invention relates to a preparation method of a cathodic electrophoretic paint catalyst, in particular to a preparation method of bismuth hydroxide. Background technique [0002] Bismuth hydroxide has a good application prospect in the fields of epoxy system cathodic electrodeposition coating for automobile electrophoretic coating, manufacture of bismuth salt, absorption of rutin and quercetin, and hydrolysis of ribonucleic acid. For example, in the patent CN 102027076A published on April 20, 2011, it was pointed out that the use of dibutyltin oxide would cause shrinkage cavities and form precipitates to be removed from the dip coating bath. However, the current method of preparing bismuth hydroxide is to react with bismuth salt or sodium hydroxide, or to prepare by chemical precipitation in water by barium nitrate and ammonium carbonate in a ratio of 5:1. This chemical precipitation method has the advantages of simple process and easy basis. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B01J23/18
Inventor 赵青燕陈志波钟小华
Owner FIRST RARE MATERIALS CO LTD
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