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Method for preparing high temperature-resistant bismuth vanadate pigment

A bismuth vanadate, high temperature resistant technology, applied in inorganic pigment processing, chemical instruments and methods, fibrous fillers, etc., can solve problems such as poor compatibility

Active Publication Date: 2017-04-05
先导颜料(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, zinc phosphate (calcium), precipitated silica, zinc borate and other substances are commonly used in existing technical solutions, especially products using zinc borate as a modified product. Due to the safety and environmental protection requirements of some countries, Plastic and nylon products produced by using such boron-containing pigments cannot be sold in such countries; in addition, some media (such as inorganic silicon systems) have poor compatibility with acidic borate products, and the market needs a An alkaline product as a supplement for some special fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The present invention adopts following technical scheme: a kind of preparation method of high temperature resistant bismuth vanadate pigment comprises the following steps:

[0023] Step S1: Take the bismuth vanadate raw material, add water and stir quickly to form a dispersion, add acid to adjust the pH of the dispersion to 2.0-3.3;

[0024] Step S2: After the dispersion liquid is completely dispersed into a slurry, start to heat up, and raise the temperature to 50-100°C at a certain heating rate, and then operate at a constant temperature, drop the SiO-containing solution into the slurry 3 2- and OH - solution, the liquid addition time is 20-50 minutes, until the pH value rises to 12.0-12.5;

[0025] Step S3: Add acid to adjust the pH value of the solution to 6-7, precipitate the precipitate, filter the precipitate and wash it, add the precipitate to the solution containing PO 4 3- The solution is mixed uniformly and then dried to obtain a high temperature resistan...

Embodiment 1

[0036] Take 50g of commercially available coating-grade bismuth vanadate raw material, add 300g of water, stir and disperse rapidly for 30 minutes, add 3g of 80% glacial acetic acid, add nitric acid to adjust the pH value to 2.5, and start heating after the slurry is completely dispersed, at 3°C / Raise the temperature to 85°C at a rate of 1 minute, then operate at a constant temperature, drop in a solution formed by dissolving 30g sodium silicate nonahydrate and 10g NaOH in 200ml water, add liquid for 30 minutes, and the pH value rises to 12.2. After 10 minutes, use a mass Adjust the pH value to 6.5 with dilute nitric acid with a fraction of 10%. After 10 minutes, filter and wash, add 20g of trisodium phosphate dodecahydrate and 5g of water to the filter cake, mix well, and then dry at 90°C. After drying, the dry filter cake is crushed and ground into powder, and recorded as sample 1.

Embodiment 2

[0038] Take 50g of commercially available paint-grade bismuth vanadate raw material, add 400g of water, stir and disperse rapidly for 30 minutes, add 3g of 80% glacial acetic acid, add nitric acid to adjust the pH value to 2.0, and start heating after the slurry is completely dispersed, at 2°C / Raise the temperature to 50°C at a rate of 1 minute, then operate at a constant temperature, drop in a solution formed by dissolving 20g sodium silicate nonahydrate and 10g NaOH in 200ml water, add liquid for 20 minutes, and the pH value will rise to 12.0. After 10 minutes, use a mass Adjust the pH value to 6.0 with dilute nitric acid with a fraction of 10%. After 10 minutes, filter and wash, add 10g of trisodium phosphate dodecahydrate and 5g of water to the filter cake, mix well and dry at 90°C. The dried filter cake is crushed and ground into powder, and recorded as sample 2.

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Abstract

The invention relates to a method for preparing a high temperature-resistant bismuth vanadate pigment. The method comprises S1: taking a bismuth vanadate raw material, adding water into the bismuth vanadate raw material, carrying out fast stirring to obtain a dispersion liquid, and adding an acid into the dispersion liquid to adjust pH to 2.0-3.3, S2: after the dispersion liquid is completely dispersed to form slurry, heating the slurry to a temperature of 50 to 100 DEG C at a certain heating rate, and adding a solution containing SiO3<2-> and OH<-> into the slurry drop by drop at the constant temperature in 20-50min until the pH is 12.0-12.5, and S3: adding an acid into the solution to adjust solution pH to 6-7, carrying out precipitation, filtering the precipitates, washing the precipitates, adding the precipitates into a PO4<3->-containing solution, carrying out uniform mixing and carrying out drying to obtain the high temperature-resistant bismuth vanadate pigment. According to the method, pH is adjusted through a simple process, a loose layer-compact layer-loose layer silicon dioxide layer is gradually formed on the surface of the bismuth vanadate and a phosphate is used and is adsorbed in the silicon dioxide layer so that the high temperature-resistant bismuth vanadate pigment is prepared on the surface of a plastic product.

Description

technical field [0001] The invention relates to a modification treatment process of pigments, in particular to a preparation method of a high-temperature-resistant bismuth vanadate pigment that can be used for plastics and high-temperature coatings. Background technique [0002] Bismuth vanadate (BiVO 4 ) has a high surface activity. At present, many technical solutions cover the surface of bismuth vanadate with a thick layer of solid deposits to isolate the contact between the application medium (such as plastic or powder coating) and the bismuth vanadate pigment, and improve the vanadate High temperature resistance of bismuth pigments when used in medium. [0003] However, zinc phosphate (calcium), precipitated silica, zinc borate and other substances are commonly used in existing technical solutions, especially products using zinc borate as a modified product. Due to the safety and environmental protection requirements of some countries, Plastic and nylon products produ...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09C3/06C09C3/08
CPCC09C1/0006C09C3/006C09C3/063
Inventor 裴志明朱刘李京振
Owner 先导颜料(天津)有限公司
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