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Preparation method of coated bismuth vanadate pigment

A bismuth vanadate and coating type technology is applied in the field of preparation of coating type bismuth vanadate pigments, which can solve the problems of weakened acid resistance of pigments, poor pigment performance, inability to improve the performance of bismuth vanadate, etc., so as to improve the acid resistance. , performance improvement, the effect of improving the coating effect

Active Publication Date: 2014-01-22
昆明先导新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these coating processes are basically operated in a continuous multi-layer coating mode, but these coating processes are susceptible to interference from various ions left in previous operations, such as US Patent No. 6,423,131, when the first A layer of coated Al(OH) 3 There will be a lot of CO remaining in the solution 3 2- 、HCO 3 - , when thereafter coated with CaF 2 , CaSiO 3 , Ca3(PO 4 ) 2 , Ca 2 SiO 5 , Zn 3 (PO 4 ) 2 When equivalent, CaCO will be generated 3 , ZnCO 3 etc., so that all Ca 2- , Zn 2- The presence of these carbonates will weaken the acid resistance of the coated pigments; due to continuous multi-layer coating, a series of chemical changes will occur in the inner coating during calcination. When volatile matter volatilizes, it will destroy the outer coating, resulting in poor coating effect of the pigment
[0004] In addition, the continuous coating process will contain free matter that was not coated on the surface of bismuth vanadate in the previous layer. These free matters not only cannot improve the performance of bismuth vanadate, but also reduce the dyeing power of the pigment. Will make the performance of the pigment worse

Method used

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preparation example Construction

[0013] The preparation method of the coated bismuth vanadate pigment according to the present invention comprises the steps of: providing a bismuth vanadate matrix with a specified particle size; adding pure water to the bismuth vanadate matrix with a specified particle size to prepare a coating base slurry; Heating the coating base slurry, carrying out chemical reaction coating and adjusting pH, filtering, washing, drying, calcining, wet grinding, filtering and washing after the coating reaction is completed, to obtain coated bismuth vanadate; Bismuth vanadate and pure water are added to prepare the coated base slurry, and the previous step is repeated for a specified number of times to obtain the final coated bismuth vanadate pigment.

[0014] In the preparation method of the coated bismuth vanadate pigment according to the present invention, preferably, the prescribed number of repetitions is 1-3 times.

[0015] In the preparation method of the coated bismuth vanadate pigme...

Embodiment 1

[0028] Take 100g of bismuth vanadate matrix with an average particle size of 0.6μm, add 2L of pure water, stir to prepare a bismuth vanadate slurry, heat to 60°C, take 5.16g of ZnO and add HNO 3 After dissolving, add purified water to make the volume 43ml (so that Zn 2+ The concentration is 1.47mol / L), drop it into the bismuth vanadate slurry, drop it in 1.5h, and use 0.5mol / L Na at the same time 3 PO 4 12H 2 O to maintain a pH value of 7.0, continue to heat and stir for 1 hour after the dropwise addition is completed, centrifugal sedimentation filter, washing machine washing, drying, calcining in a muffle furnace at 400 ° C for 2 hours, wet ball milling with a drum mill at 60 RPM for 1 hour, centrifugation Precipitation filtration, washing machine washing to obtain a layer of coated bismuth vanadate powder;

[0029] Prepare a slurry with pure water and a layer of coated bismuth vanadate powder at a mass ratio of 10:1, heat to 65°C, and add 70ml of 1mol / L AlCl 3 Drop into ...

Embodiment 2

[0033] Take 100g of bismuth vanadate matrix with an average particle size of 0.6μm, add 2L of pure water, stir to prepare a bismuth vanadate slurry, heat to 30°C, take 3.39g of ZnO and add HNO 3 After dissolving, add purified water to make the volume 43ml (so that Zn 2+ The concentration is 0.97mol / L), drop into the bismuth vanadate slurry, drop it in 1.5h, and at the same time use 0.5mol / L Na 3 PO 4 12H 2 O to maintain a pH value of 7.0, continue to heat and stir for 1 hour after the dropwise addition is completed, centrifugal sedimentation filter, washing machine washing, drying, calcining in a muffle furnace at 200 ° C for 2 hours, wet ball milling with a drum mill at a speed of 10 RPM for 1 hour, centrifugation Precipitation filtration and washing machine washing to obtain a layer of coated bismuth vanadate powder;

[0034] Prepare a slurry with pure water and a layer of coated bismuth vanadate powder according to the mass ratio of pure water 10:1, heat to 95°C, and add...

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Abstract

The present invention provides a method for preparing a coated bismuth vanadate pigment, comprising steps of: providing a bismuth vanadate substrate of a specified particle size; adding pure water to the bismuth vanadate substrate of the specified particle size to formulate a basic coating slurry; heating the basic coating slurry, carrying out a chemical reaction for coating, adjusting the pH, and carrying out filtering, washing, drying, sintering, wet milling, filtering and washing after the coating reaction is complete, to obtain coated bismuth vanadate; and adding pure water to the obtained coated bismuth vanadate to formulate a basic coating slurry, and repeating the previous step for a specified number of times, to obtain a final coated bismuth vanadate pigment. Through the method for preparing a coated bismuth vanadate pigment of the present invention, acid resistance, alkali resistance and temperature resistance of the obtained coated bismuth vanadate pigment can be improved, thereby avoiding interference between different layers in the multilayer coating process.

Description

technical field [0001] The invention relates to a preparation method of a bismuth vanadate pigment, in particular to a preparation method of a coated bismuth vanadate pigment. Background technique [0002] The existing bismuth vanadate coating method is CaSiO 3 , Ca 3 (PO 4 ) 2 , Ca 2 SiO 5 , SiO 2 , CaF 2 , Zn 3 (PO 4 ) 2 , AlOOH, BiOCl, etc., to improve the weather resistance, light resistance, chemical corrosion resistance, dispersibility, etc. of coatings and plastics made of bismuth vanadate. [0003] However, these coating processes are basically operated in a continuous multi-layer coating mode, but these coating processes are susceptible to interference from various ions left in previous operations, such as US Patent No. 6,423,131, when the first A layer of coated Al(OH) 3 There will be a lot of CO remaining in the solution 3 2- 、HCO 3 - , when thereafter coated with CaF 2 , CaSiO 3 , Ca3(PO 4 ) 2 , Ca 2 SiO 5 , Zn 3 (PO 4 ) 2 When equivalent...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09C3/06
CPCC09C1/62C09C3/04C09C3/06C09C1/0006C01P2004/62C01P2004/84
Inventor 裴志明朱刘赵青燕李蓉刘华胜
Owner 昆明先导新材料科技有限责任公司
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