Preparation method for pigment coated with prussian blue or prussian blue analogue

A technology similar to Prussian blue and Prussian blue, applied in the field of pigment preparation, which can solve the problems of decreased gloss, difficulty in filtration, and free iron blue

Active Publication Date: 2017-11-24
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 μm Obvious dissociation occurs, resulting in a decrease in gloss after coating and difficulty in filtration
Kuncai patent 201210405046.2 discloses a magnetically coated Prussian blue pigment, which is coated in a similar way to Kuncai patent 201110259368.6, and it is also easy to dissociate, especially the dissociation of iron blue coated with a large particle size substrate. question

Method used

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  • Preparation method for pigment coated with prussian blue or prussian blue analogue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In the reactor, add 60g of glass flakes with an average particle size of 500μm and a thickness of 3μm, add 800mL of water to make a slurry, add 4g of ammonium chloride, heat up to 78°C, and stir for 3h; use hydrochloric acid to adjust the pH of the system to 2.5, Add 20mL of 0.25M potassium ferrocyanide aqueous solution at a rate of 10mL / h at a temperature of 78°C, and at the same time add 6.7mL of 1M ferric chloride aqueous solution at a rate of 3.33mL / h. During this process, use hydrochloric acid or sodium hydroxide to maintain the pH 2.5-2.6, stirred for 0.1h after the addition was completed; then suction filtered, almost free, and obtained Prussian blue-coated glass flakes.

[0048] Coating amount is Fe 4 [Fe(CN] 6 ] The theoretical amount calculated is 1.43g, the calculated coating amount is 1.40g, the coating rate is 2.3% of the base material weight, and the coating amount is 97% of the theoretical amount, indicating that the free situation has been excellently c...

Embodiment 2

[0050] In the reactor, add 60g of synthetic mica substrate chameleon with an average particle size of 40 μm, add 500g of water and 100g of ethanol to prepare a slurry according to the solid-to-liquid weight ratio of 1 / 10, add 2g of ammonium chloride and 2g of urea, and heat up to 85 Stir at ℃ for 2 hours; adjust the pH of the system to 2.7 with sulfuric acid, add 60mL of 0.5M ammonium ferrocyanide solution at 10mL / h at a temperature of 60°C, and add 60mL of 0.66M ferric chloride aqueous solution at 10mL / h at the same time. Hydrochloric acid or sodium hydroxide maintains the pH of the system at 2.7-2.8, and stirs for 0.5h after the addition is complete; filters and washes to obtain a chameleon-coated iron blue pigment, almost free of dissociation. Coating amount is Fe 4 [Fe(CN] 6 ] 3 The calculated theoretical amount is 8.58g, the calculated coating amount is 8.26g, the coating rate is 13.8% of the substrate weight, and the coating amount is 96% of the theoretical amount, whi...

Embodiment 3

[0052] In the reactor, add 60g of green interference pearlescent pigment of synthetic mica coated titanium dioxide with an average particle size of 100 μm, add 1200g of water according to the solid-to-liquid weight ratio of 1 / 20 to prepare a slurry, add 2g of ammonium sulfate and 2g of ammonium bromide, Raise the temperature to 85°C and stir for 3 hours; use sulfuric acid to adjust the pH of the system to 2.5, add 15mL of 0.25M ammonium ferrocyanide solution at 5ml / h at 85°C, and simultaneously add 15mL of ferric chloride 0.167M and Titanium chloride 0.125M mixture aqueous solution, use sodium hydroxide or hydrochloric acid to maintain the pH value of the system at 2.5-2.6 during the process, stir for 0.5h after the addition is complete; filter and wash, the free amount is small, and after drying, obtain a green interference Color, green accumulation of color powder. Its theoretical coating amount is Fe 4 Ti 3 [Fe(CN) 6 ] 6 It is 1.02g, and the calculated coating amount is...

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Abstract

The invention relates to a preparation method for a pigment coated with prussian blue or prussian blue analogue. The method comprises the following steps: treating a substrate by utilizing a Zeta potential adjusting additive and then coating the prussian blue or prussian blue analogue, thereby acquiring the pigment coated with prussian blue or prussian blue analogue. According to the method provided by the invention, the free problem of the substrate coated with prussian blue or prussian blue analogue can be effectively solved. The pigment coated with prussian blue or prussian blue analogue prepared according to the invention can be applied to the industries of cosmetics, coating 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(III)(H 2 O) 6 ] 3+ and [Fe(II)(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. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C1/40C09C1/28C09C1/24C09C3/06
CPCC09C1/0021C09C1/24C09C1/28C09C1/3653C09C1/405C09C3/06C09C2200/1004C09C2200/102C09C2220/10
Inventor 林一中王振兴
Owner 林一中
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