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Preparation method of cobalt chromium green pigment

A cobalt chrome green and pigment technology, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of wide product particle distribution, low product purity, complicated production process, etc., achieve consistent product composition and reduce diffusion Good resistance, good product quality

Inactive Publication Date: 2015-07-08
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydroxide co-precipitation method requires the use of soluble metal salts as raw materials, such as cobalt, chromium nitrate, sulfate, etc. The production process is more complicated, the product particle distribution is wider, and the product purity is not high
Wet preparation is prone to segregation of metal ions, and agglomeration of nanocrystals is also prone to occur during thermal decomposition

Method used

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  • Preparation method of cobalt chromium green pigment
  • Preparation method of cobalt chromium green pigment
  • Preparation method of cobalt chromium green pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 100.0g of cobalt nitrate hexahydrate with a content of 99.0% and 275.0g of chromium nitrate nonahydrate with a content of 99.0%, add 1125mL of water and mix well, then mix with 300g of stearic acid and 60g of chromium nitrate with a relative molecular mass of 10210 The mixed solution of acrylic acid-styrene block copolymer is mixed, and the temperature is kept at 80°C. Stir continuously until the mixed solution gradually turns into a blue-green transparent sol, and then turns into a dark green gel after evaporating water.

[0026] (2) The gel obtained in step (1) was placed in an electric blast drying oven, and dried at 120°C for 3 hours to prepare a xerogel precursor.

[0027] (3) Place the dry gel precursor obtained in step (2) in a muffle furnace, ignite and burn it in an air atmosphere to form a gray-green powder, then raise the temperature to 800°C, keep it warm for 4 hours, take it out of the furnace to cool, and crush it to obtain cobalt chromium green p...

Embodiment 2

[0029] (1) Take 100.0g of cobalt nitrate hexahydrate with a content of 99.0% and 275.0g of chromium nitrate nonahydrate with a content of 99.0%, add 1500mL of water and mix well, then mix with 400g of stearic acid and 70g of chromium nitrate with a relative molecular mass of 31831 The mixed solution of acrylic acid-styrene block copolymer was mixed, and the temperature was kept at 85°C. Stir continuously until the mixed solution gradually turned into a blue-green transparent sol, and then turned into a dark green gel after evaporating water.

[0030] (2) The gel obtained in step (1) was placed in an electric blast drying oven, and dried at 125°C for 2.5 hours to prepare a xerogel precursor.

[0031] (3) Put the dry gel precursor obtained in step (2) in a muffle furnace, ignite and burn it into a gray-green powder in an air atmosphere, then raise the temperature to 1100°C, keep it warm for 3 hours, take it out of the furnace to cool, and crush it to obtain cobalt chromium green ...

Embodiment 3

[0033] (1) Take 100.0g of cobalt nitrate hexahydrate with a content of 99.0% and 281.8g of chromium nitrate nonahydrate with a content of 99.0%, add 1600mL of water and mix well, then mix with 500g of stearic acid and 62.5g of Mix the mixed solution of acrylic-styrene block copolymer, keep the temperature at 90°C, and keep stirring until the mixed solution gradually turns into a blue-green transparent sol, and then turns into a dark green gel after evaporating water.

[0034] (2) The gel obtained in step (1) was placed in an electric blast drying oven, and dried at 130°C for 2 hours to prepare a xerogel precursor.

[0035] (3) Place the dry gel precursor obtained in step (2) in a muffle furnace, ignite and burn it in an air atmosphere to form a gray-green powder, then raise the temperature to 1200°C, keep it warm for 2 hours, take it out of the furnace to cool, and crush it to obtain cobalt chromium green product.

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Abstract

The invention discloses a preparation method of cobalt chromium green pigment. According to the method, soluble salts or oxides of cobalt and chromium are used as raw materials; and the method comprises the steps of complexing carboxyl and metal ions by the synergistic effect of stearic acid and acrylic acid-styrene block copolymer to prepare sol-gel precursor; drying the sol-gel precursor to prepare xerogel; preparing the cobalt chromium green pigment by using a self-propagating combustion method. By adoption of the method, the segregation of the metal ions caused in the preparation process can be reduced, the diffusion resistance and the reaction temperature of reaction materials can be reduced, the reaction speed is improved, and the energy is saved; and the nanocrystalline agglomeration caused in the thermal decomposition process is effectively avoided. The cobalt chromium green pigment prepared by the method has the advantages that the composition is consistent, particles are fine, the particle size is uniform and in narrow distribution, and the crystalline form is regular; the defects that the product prepared by the traditional solid phase calcination method is large in particle size and wide in distribution of the particle size, so that the product needs to be ground, the crystalline form is damaged, etc are overcome. The method is simple in technology and easy to operate and control; the product is good in quality and less in emission of three wastes; the investment is saved, and industrialization can be easily realized.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to a preparation method of an inorganic metal oxide miscible pigment, in particular to a preparation method of a cobalt chrome green pigment. Background technique [0002] Cobalt chrome green (CoCr 2 o 4 ) is a green cobalt chromate pigment similar to navy green, which is a metal oxide mixed phase pigment with a spinel crystal structure. Cobalt chrome green has excellent chemical resistance, insoluble in water and organic solvents, compatible with most thermoplastic and thermosetting resins; excellent outdoor weather resistance, good thermal stability and light resistance; and has no permeability, No migration and other characteristics. This pigment is easy to disperse, has strong tinting and hiding power, and bright colors. It is often designed to simulate the spectral reflection curve of chlorophyll, so that it has infrared reflection characteristics; it is also designed to penetrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00
Inventor 唐安平刘立华李波令玉林
Owner HUNAN UNIV OF SCI & TECH