Low-hexavalent-chromium precipitated copper and chromium black pigment as well as preparation method and application thereof

A technology of copper chrome black and hexavalent chromium is applied in the field of low hexavalent chromium precipitation copper chrome black pigment and its preparation, and can solve the problems of chemical stability, insufficient acid and alkali resistance and heat resistance, inability to black pigment, poor covering power, etc. problem, to achieve the effect of complete grain, good dispersion and high safety

Active Publication Date: 2018-05-22
SOUTH CHINA INST OF COLLABORATIVE INNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But nano CuCr 2 o 4 Poor hiding power, chemical stability, acid and alkali resistance, and heat resistance are not enough, so it cannot be used as a black pigment, and does not belong to the category of copper chrome black pigment

Method used

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  • Low-hexavalent-chromium precipitated copper and chromium black pigment as well as preparation method and application thereof
  • Low-hexavalent-chromium precipitated copper and chromium black pigment as well as preparation method and application thereof
  • Low-hexavalent-chromium precipitated copper and chromium black pigment as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A low hexavalent chromium precipitated copper chromium black pigment is composed of Cu and Cr elements, Cu:Cr is 1:2, and the preparation method comprises the following steps:

[0055] (1) Preparation of nitrate solution: In order to reduce costs, copper oxide and chromium hydroxide are selected as raw materials, and 1.0mol CuO and 2.0mol Cr(OH) are taken 3 Add to 1.5kg deionized water, add 815g (theoretical dosage is 8molHNO 3 , add 1.1 times of theoretical consumption and convert into 68% industrial nitric acid mass) industrial nitric acid dissolution raw material with a mass fraction of 68%, the solution is stirred and heated, the heating temperature is 50 ° C, after the dissolution is completed, filter and remove insoluble impurity particles to obtain a nitrate solution ;

[0056] (2) Combustion solution preparation: add auxiliary fuel (200g citric acid monohydrate and 280g urea) to the nitrate solution in the step (1), continue heating and stirring at 50°C, and ob...

Embodiment 2

[0066] A low hexavalent chromium precipitated copper chromium black pigment is composed of Cu and Cr elements, and Cu:Cr is 1.1:2. The preparation method comprises the following steps:

[0067] (1) Preparation of nitrate solution: selected copper nitrate and chromium nitrate as raw materials, got 1.0molCu(NO 3 ) 2 ·3H 2 O and 2.0mol Cr(NO 3 ) 3 9H 2 O was added to 2.4kg deionized water, the solution was stirred and heated, the heating temperature was 60°C, after the dissolution was completed, the insoluble impurity particles were removed by filtration to obtain a nitrate solution;

[0068] (2) Combustion solution preparation: add auxiliary fuel (220g citric acid monohydrate, 300g urea) to the nitrate solution in the step (1), continue heating and stirring at 60°C, and obtain a combustion solution after dissolving;

[0069] (3) Low-temperature self-propagating combustion: The combustion solution in step (2) is evaporated and concentrated by heating at 60°C. After the volum...

Embodiment 3

[0075] A low hexavalent chromium precipitated copper chromium black pigment is composed of Cu, Cr and Fe elements, Cu:Cr:Fe is 1.1:1.99:0.01, and the preparation method comprises the following steps:

[0076] (1) Preparation of nitrate solution: select copper oxide, chromium hydroxide, and ferric nitrate as raw materials, take 1.1mol CuO, 1.99mol Cr(OH) 3 , 0.01mol Fe(NO 3 ) 3 9H 2 O was added to 2.0kg deionized water, and 910g (theoretical dosage was 8.17molHNO 3 , add 1.2 times the theoretical amount and convert it into 68% industrial nitric acid (mass fraction of 68% industrial nitric acid) to dissolve the raw material, stir and heat the solution, the heating temperature is 70 ° C, after the dissolution is completed, filter and remove the insoluble impurity particles to obtain the nitrate solution ;

[0077] (2) Combustion solution preparation: add auxiliary fuel (220g citric acid monohydrate, 300g urea) to the nitrate solution in the step (1), continue heating and stir...

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Abstract

The invention belongs to the technical field of pigment synthesis and discloses a low-hexavalent-chromium precipitated copper and chromium black pigment as well as a preparation method and applicationthereof. The method comprises the following steps: (1) preparing a nitrate solution, preparing raw materials into the nitrate solution containing Cu<2+>, Cr<3+> and Fe<3+>; (2) preparing a combustionsolution, mixing the nitrate solution and auxiliary fuel to obtain the combustion solution; (3) carrying out low-temperature self-propagating combustion: after evaporating and concentrating the combustion solution, heating the solution in a heating device and initiating the self-propagating combustion; collecting a combustion product; (4) mixing and carrying out ball milling: carrying out the ball mixing on the combustion product and inorganic salt and mixing to obtain a mixture; (5) carrying out high-temperature calcining: putting the mixture into the heating device and carrying out the high-temperature calcining; (6) carrying out post-treatment: carrying out water washing on a product obtained by the high-temperature calcining and drying to obtain the copper and chromium black pigment.The copper and chromium black pigment prepared by the preparation method has the advantages of high purity, complete crystalline grains, good dispersity and low hexavalent chromium content; the pigment has a small average grain diameter which can reach 0.5mu m.

Description

technical field [0001] The invention belongs to the technical field of pigment synthesis, and in particular relates to a low hexavalent chromium precipitated copper chromium black pigment and its preparation method and application. Background technique [0002] Copper chrome black (trade name: Pigment Black 28 / Pigment Black 28) has a chemical formula of CuCr 2 o 4 , with a spinel structure, is a typical class of metal oxide mixed-phase inorganic pigments. Compared with common black pigments such as carbon black and iron oxide black, copper chromium black pigments have outstanding advantages such as high temperature resistance, weather resistance, light resistance, acid and alkali resistance, no migration, no bleeding, easy dispersion, insoluble in water and organic solvents, etc. Therefore, it is especially suitable for the coloring of plastics (ordinary plastics, engineering plastics), coatings (high temperature resistant coatings, exterior wall coatings, fluorocarbon coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/14
CPCC01G37/14C01P2002/32C01P2002/72C01P2002/88C01P2004/03C01P2004/61C01P2004/62C01P2006/80
Inventor 郑华德艾树鹤张明
Owner SOUTH CHINA INST OF COLLABORATIVE INNOVATION
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