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Preparation method of bismuth oxychloride pearlescent pigment

A technology of bismuth oxychloride and pearlescent pigments, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve the problems of poor dispersibility, easy agglomeration, complicated process, uneven distribution of bismuth oxychloride products, etc., and achieve stable product quality. , The effect of simple process operation and cheap raw materials

Active Publication Date: 2013-09-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation method of bismuth oxychloride, which uses bismuth oxychloride acid solution hydrolysis culture crystal nuclei, and then grow into polygonal flake-like pearlescent bismuth oxychloride crystals

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  • Preparation method of bismuth oxychloride pearlescent pigment
  • Preparation method of bismuth oxychloride pearlescent pigment
  • Preparation method of bismuth oxychloride pearlescent pigment

Examples

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Effect test

Embodiment 1

[0055] Weigh 1g of bismuth oxide and 1.7mL of concentrated hydrochloric acid with a mass fraction of 38% and place it in a beaker to form a bismuth chloride hydrochloric acid aqueous solution with a concentration of 2.5mol / L. Measure 160mL of water (the mass of bismuth chloride solution and water The ratio is 1:53) placed in a three-necked flask and heated in a water bath at 50°C, and the bismuth chloride hydrochloric acid aqueous solution was added to the water at a drop rate of 0.35mL / min under the stirring intensity of 80rpm, so that the pH of the system after the reaction was ≤1 , white bismuth oxychloride crystals were precipitated, stirred and reacted at a constant temperature of 50°C for 1 hour, filtered the final product, washed several times with appropriate amount of deionized water and absolute ethanol, and dried in an oven at 60°C for 5 hours to obtain BiOCl white pearlescent pigment with uniform dispersion, thickness of about 50nm, and cross-sectional diameter of a...

Embodiment 2

[0057] Weigh 1g of bismuth oxide and 9mL of concentrated hydrochloric acid with a mass fraction of 36% and place it in a beaker to form a bismuth chloride hydrochloric acid aqueous solution with a concentration of 0.5mol / L. Measure 160mL of water (the mass of bismuth chloride acid solution and water is 1:14) placed in a water bath in a three-necked bottle and heated at 70°C, and added bismuth chloride hydrochloric acid aqueous solution to the water at a drop rate of 3.5mL / min under a stirring intensity of 300rpm, so that the pH of the system after the reaction was ≤0.3, with White bismuth oxychloride crystals were precipitated, stirred and reacted at a constant temperature of 70°C for 2 hours, the final product was filtered, washed several times with appropriate amount of deionized water and absolute ethanol, and dried in an oven at 60°C for 5 hours to obtain uniform dispersion , The thickness is about 300nm, the cross-sectional diameter is about 5μm quadrilateral flake BiOCl w...

Embodiment 3

[0059] Weigh 1g of bismuth oxide and 2.8mL of concentrated hydrochloric acid with a mass fraction of 37.5% and place it in a beaker to form a bismuth chloride hydrochloric acid aqueous solution with a concentration of 1.5mol / L. Measure 30mL of water (the mass of bismuth chloride solution and water 1:7) placed in a three-necked flask and heated in a water bath at 90°C, and added bismuth chloride hydrochloric acid aqueous solution to the water at a drop rate of 2mL / min under a stirring intensity of 100rpm, so that the pH of the system after the reaction was ≤0.3, with White bismuth oxychloride crystals were precipitated, stirred and reacted at a constant temperature of 90°C for 0.5 hours, the final product was filtered, washed several times with appropriate amount of deionized water and absolute ethanol, and dried in an oven at 60°C for 5 hours to obtain uniform dispersion , The thickness is about 120nm, the cross-sectional diameter is about 5μm quadrilateral flake BiOCl white pe...

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Abstract

The invention relates to a preparation method of a bismuth oxychloride pearlescent pigment. The method comprises the following steps of: preparing a bismuth salt acidized water solution with a certain concentration by using bismuth salt as raw material, adding water to regulate the PH value of a reaction system, controlling the process parameters such as reaction temperature, reaction time and stirring strength, hydrolyzing the bismuth salt to prepare polygonal (such as quadrilateral or octagonal) laminar pearlescent bismuth oxychloride crystal. The raw material in the preparation method provided by the invention is cheap and easy to obtain, the morphological control can be performed in the bismuth hydrolysis process without adding a surfactant, and the PH value of the reaction system can be controlled without adding alkali liquor; the prepared bismuth oxychloride crystal is uniform in dispersion, good in pearlescent effect, simple in operation process, and good in industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of bismuth oxychloride, in particular to a preparation method of multi-morphology pearlescent bismuth oxychloride. Background technique [0002] Bismuth oxychloride is a kind of white flake-like insoluble bismuth compound, which has a silvery white pearly luster when it is kneaded. The bismuth intermediate product obtained in the process. At the same time, it is also a very important chemical product, mainly used as a pearlescent pigment to manufacture artificial pearls, pearlescent buttons, and pearlescent plastic decorations. With its unique pearlescent effect and smoothing effect, bismuth oxychloride is used to prepare safe and non-toxic high-end cosmetics. Especially after the 1960s, with the rising price of fish guanine crystals, bismuth oxychloride particles have gradually become the most popular in cosmetics. Commonly used pearlescent pigments (Materials Review, 2008 (2), 280-282). [0003] People...

Claims

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Application Information

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IPC IPC(8): C01G29/00
Inventor 肖清贵张笛徐红彬霍鑫涛张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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