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Method for preparing super-fine vanadic-acid bismuth-yellow pigment

A technology of fine bismuth vanadate and yellow pigments, applied in the chemical field, can solve the problems of single raw material, complex manufacturing process, unsatisfactory, etc., achieve mild reaction conditions and reduce production costs

Inactive Publication Date: 2007-11-14
LUDONG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above preparation methods can all prepare yellow pigments based on bismuth vanadate, but either the manufacturing process is complicated and the hiding power is low; or the raw materials are single, and no serialized products are formed; or the product particles are relatively large, which cannot meet the higher requirements. Require

Method used

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  • Method for preparing super-fine vanadic-acid bismuth-yellow pigment
  • Method for preparing super-fine vanadic-acid bismuth-yellow pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve bismuth nitrate and ammonium metavanadate in 4 mol L -1 In the nitric acid aqueous solution, the concentration of bismuth nitrate and ammonium metavanadate is 0.1mol L -1 , then add the nitric acid aqueous solution of ammonium metavanadate to the nitric acid aqueous solution of bismuth nitrate at room temperature, and control the V: Bi molar ratio to be 1: 1, and adjust the pH value to 2 by dropping ammonia solution diluted 1 times with distilled water , stirred and reacted for 2 hours, the precipitate was filtered, washed and dried to obtain light yellow powder. X-ray diffraction test shows that the product is tetragonal zirconium silicate structure. Accompanying drawing 1 is the X-ray diffraction pattern of product. The light yellow powder was heat-treated at 500° C. for 2 hours to obtain a dark yellow powder. X-ray diffraction test shows that the product is monoclinic scheelite structure. Accompanying drawing 2 is the X-ray diffraction pattern of the pro...

Embodiment 2

[0033] Dissolve bismuth nitrate and sodium metavanadate in 4 mol L -1 In the nitric acid aqueous solution, the concentration of bismuth nitrate and sodium metavanadate is 0.15mol L -1 , then add the nitric acid aqueous solution of sodium metavanadate to the nitric acid aqueous solution of bismuth nitrate at room temperature, and control V: Bi molar ratio is 1: 1, by dropwise adding 2mol L -1 Aqueous sodium hydroxide solution was used to adjust the pH value to 2, and the reaction was stirred for 1 hour. The precipitate was filtered, washed, and dried to obtain a yellow powder. X-ray diffraction test shows that the product is tetragonal scheelite structure. Accompanying drawing 4 is the transmission electron micrograph of product, proves that product is flaky bismuth vanadate.

Embodiment 3

[0035] Dissolve bismuth nitrate and ammonium metavanadate in 5 mol L -1 In the nitric acid aqueous solution, the concentration of bismuth nitrate and ammonium metavanadate is 0.2mol L -1 , and then add the nitric acid aqueous solution of ammonium metavanadate to the nitric acid aqueous solution of bismuth nitrate at 50 ° C, and control the V: Bi molar ratio to be 1: 1, by dropping 2mol L -1 Potassium hydroxide aqueous solution to adjust the pH value to 1, stirred and reacted for 0.5 hours, filtered the precipitate, washed, and dried to obtain a yellow powder with a green phase. X-ray diffraction test shows that the product is monoclinic scheelite structure.

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Abstract

The invention discloses the methods of preparation for a superfine bismuth vanadate yellow pigment, the characteristics of its bismuth nitrate, partial vanadate or vanadate are the main raw material. Through controlling of its appropriate pH and temperature to get the Ultra-fine particles,which composed of bismuth vanadate yellow pigments.well by adding surfactant or changing vanadium source, itcan further control particle morphology, which were prepared by a diameter of 50-150 nm spherical particles, 100-200 nanometer length, width 50-100 nanometers Flake Vanadate Bismuth or length of 200-300 nm rod bismuth vanadate. The preparation of this invention is a simple process, and can be controlled morphology, the bismuth vanadate can meet the needs of different occasions, which can be widely used in the automotive topcoat, ink, paint and other requirements for a higher size area.

Description

technical field [0001] The invention belongs to the preparation of compounds in the field of chemistry. It relates to a preparation process of superfine yellow pigment bismuth vanadate. Background technique [0002] Yellow is an eye-catching color. All places that require people's attention, such as hoisting machinery, telephone booths, traffic signs, taxis, school buses for picking up students, postal facilities, etc., are generally painted in a single yellow color abroad. [0003] The most commonly used inorganic yellow pigments in the world, chrome yellow and cadmium yellow, have good performance and a long history of application. However, due to the presence of metal elements such as lead, chromium (VI) and cadmium that are harmful to human health and pollute the environment, their application fields are restricted. increasingly strict restrictions. Although a series of organic yellow pigments can be used as substitutes, they cannot meet the actual needs of hiding powe...

Claims

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Application Information

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IPC IPC(8): C09C1/00
CPCC01P2004/16C01P2004/32C01G31/00C09C1/0006C01P2004/24C01P2004/62C01P2004/61
Inventor 高善民乔青安黄百勇赵培培陶芙蓉胡玉才徐彦宾孔令艳殷平
Owner LUDONG UNIVERSITY
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