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Preparation method of prussian blue or prussian blue analogue coated pigment

A technology similar to Prussian blue and Prussian blue, applied in the field of pigment preparation, can solve the problems of iron blue dissociation, difficulty in filtration, easy dissociation, etc., and achieve the effect of weak adsorption and small specific surface area

Active Publication Date: 2017-11-21
林一中
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses an indirect method to form Prussian blue on the surface of the substrate, and the process is cumbersome
[0006] U.S. Patent No. 4,047,969A1 discloses a method for coating iron blue, which uses soluble ferrocyanide and soluble chloride to generate Prussian blue. The method is to directly deposit Prussian blue on the surface of the substrate, but within the pH range of 3.5-5.5, it will The presence of free Prussian blue
[0007] Merck's patent WO2006005595 mentions chameleon pigments coated iron blue pigments, but does not mention specific preparation methods
[0008] Kuncai patent 201110259368.6 discloses a method for preparing Prussian blue-coated effect pigments by joint coating of potassium ferrocyanide and ferric chloride, but according to the process, especially for flake powder materials with an average particle size greater than 40

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In the reactor, add 60 g of glass flakes with an average particle size of 500 μm and a thickness of 3 μm, add 800 g of water to prepare a slurry, raise the temperature of the system to 78 ° C, control the pH = 5.4-5.5, add 6 mL of 1M aluminum chloride aqueous solution (based on aluminum oxide 0.3g, 0.5% to the base material), and add it within 10 minutes; then adjust the pH of the system to 2.5 with hydrochloric acid, first add 0.2mL of 0.25M potassium ferrocyanide solution, and use hydrochloric acid or sodium hydroxide to maintain the system pH is 2.5-2.6, then add 19.8ml of 0.25M potassium ferrocyanide at 10mL / h (a total of 20ml of 0.25M potassium ferrocyanide), and at the same time add 0.33M at a rate of 10mL / h 20mL of ferric chloride solution, and at the same time use hydrochloric acid or sodium hydroxide to maintain the pH of the system at 2.5-2.6, stir for 0.1h after the addition is complete; then filter with suction, almost free, and obtain a Prussian blue-coated ...

Embodiment 2

[0045] In the reactor, add 60g of synthetic mica-based chameleon pigment with an average particle size of 40μm, prepare a slurry with 1000g of water + 20g of ethanol according to 1 / 20, and control the pH value at 7 at 25°C, add 1M Aluminum chloride solution 12mL (0.6g for alumina, 1% for the base material), then adjust the pH of the system to 2.6 with sulfuric acid, and add 0.5mL of 0.25M potassium ferrocyanide to maintain the pH of the system at 2.6-2.7, Then stir for 1min, then add 69.5mL of 0.25M ammonium ferrocyanide solution at 35mL / h, and at the same time add 70mL of 0.33M ferric chloride aqueous solution at 35mL / h, and use hydrochloric acid or sodium hydroxide to maintain the pH value of the system during the addition process. 2.6-2.7, stir for 0.5h after the addition, filter and wash to obtain chameleon-coated iron blue pigment. (with Fe 4 [Fe(CN] 6 ] 3 Calculated as 5.0g, the calculated actual coating amount is 4.6g, the effective coating rate is 92%, and the base ...

Embodiment 3

[0047] In the reactor, add 60g of synthetic mica-coated titanium dioxide blue interference pearlescent pigment with an average particle size of 100μm, add 600mL of water according to 1 / 10 to prepare a slurry, then raise the temperature to 80 degrees, and control the system with hydrochloric acid or sodium hydroxide In the range of pH 5.0-5.9, add 10mL of 1M zinc chloride aqueous solution (0.81g, 1.35% based on the generated zinc oxide), then adjust the pH of the system to 2.5 with hydrochloric acid, and maintain the pH at 2.5-2.6, first add 0.1 mL0.25M ammonium ferrocyanide solution, then use hydrochloric acid or sodium hydroxide to control the pH value of the system at 2.5-2.6, add 13.9mL 0.25M ammonium ferrocyanide solution at 14mL / h, and at the same time, add 18.7mL / h Add 0.25M FeCl at a rate 3 Aqueous solution 14mL, stirred for 0.5h after addition; filtered and washed to obtain powder with blue interference color and blue accumulation color. (Theoretical coating amount is...

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Abstract

The invention relates to a preparation method of a prussian blue or prussian blue analogue coated pigment. The preparation method comprises coating the surface of a base with hydrated alumina and/or hydrated zinc oxide and coating the hydrated alumina and/or hydrated zinc oxide with prussian blue or prussian blue analogue to obtain the prussian blue or prussian blue analogue coated pigment. The preparation method can solve the free problem of the prussian blue or prussian blue analogue coating the base and even large-size base. The prussian blue or prussian blue analogue coated pigment can be used in industries such as cosmetics, paint and ink.

Description

technical field [0001] The invention relates to a preparation method of a pigment, more particularly to a preparation method of a pigment coated with Prussian blue or Prussian blue. Background technique [0002] When hydrated iron ion [Fe(H 2 O) 6 ] 3+ and [Fe(CN) 6 ] 4- When reacting in aqueous solution, the blue insoluble precipitate produced is called Prussian Blue. Its bright color can be maintained for a long time, so people use Prussian blue in industrial dyes, pigment inks and other color-related fields. As a continuation of the research on Prussian blue, [Fe(III)(H 2 O) 6 ] 3+ , and [Fe(II)(CN) 6 ] 4- The reaction in aqueous solution produces an insoluble precipitate, which is called a Prussian blue-like compound. [0003] Prussian blue and Prussian blue-like compounds have bright colors and are widely used in various industries, but the use of Prussian blue compounds alone will cause agglomeration and other phenomena and affect the use. Therefore, coatin...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C1/42C09C1/40C09C3/06
CPCC09C1/0021C09C1/3653C09C1/407C09C1/42C09C3/06C09C2200/1004C09C2200/102
Inventor 林一中王振兴
Owner 林一中
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