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Method for preparing nanometer cobalt blue dye

A nano-cobalt and slurry technology, applied in the direction of fibrous fillers, etc., can solve the problems of introducing impurities and high energy consumption, and achieve the effects of low energy consumption, simple production process, and high product purity

Inactive Publication Date: 2006-09-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the particle size, high-energy ball milling can be used further, but the energy consumption is higher, impurities may be introduced, and extreme ball milling is performed, and some mechanochemical reactions may occur

Method used

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  • Method for preparing nanometer cobalt blue dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 84.3 grams of cobalt sulfate and 199.8 grams of aluminum sulfate, add water and stir to dissolve, when the temperature rises to 80°C, add 3mol L -1 NaOH solution to a pH value of 9, aged for 2 hours, separated the precipitate and the supernatant, and washed the precipitate with water, and incubated the precipitate slurry at 220°C for 6 hours; Dry, grind in a mortar, and crystallize at 1000°C for 4 hours to obtain the product with a yield of 93% and an average particle size of 50nm.

Embodiment 2

[0016] Weigh 84.3 grams of cobalt sulfate, 139.9 grams of aluminum sulfate, 127.7 grams of chromium chloride, 5.7 grams of TiCl 4 (Converted from the density of the purchased solution), add water and stir to dissolve, when the temperature rises to 80°C, add 3mol L -1 NaOH solution to a pH value of 9, aged for 2 hours, separated the precipitate and the supernatant, and washed the precipitate with water, and incubated the precipitate slurry at 240°C for 4 hours; Dry, grind in a mortar, and crystallize at 1100°C for 4 hours to obtain the product with a yield of 93% and an average particle size of 50nm.

Embodiment 3

[0018] Weigh 84.3 grams of cobalt sulfate, 99.9 grams of aluminum sulfate, 199.5 grams of chromium chloride, 11.4 grams of TiCl 4 (Converted from the density of the purchased solution), add water and stir to dissolve, when the temperature rises to 80°C, add 3mol L -1 NaOH solution to a pH value of 9, aged for 2 hours, separated the precipitate and the supernatant, and washed the precipitate with water, and incubated the precipitate slurry at 240°C for 4 hours; Dry, grind in a mortar, and crystallize at 1100°C for 4 hours to obtain the product with a yield of 93% and an average particle size of 50nm.

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Abstract

This invention discloses a preparation method of nm cobalt blue, and it belongs to synthetic technique of nm spinel style colorant. This method includes following procedures cobaltous sulfate and aluminium sulphate, chromic chloride and titanium tetrachloride are mixed with water and agitated to solve, there mol ratio is that 1:(0.5-2): (0-3): (0-3), then they are heated and sodium hydrate solution is added to adjust pH value to 8-10. They are agitated, aging and water flushed, the precipitate stuff is hydrothermal cultivated at 160-260 degrees centigrade, then the hydrothermal cultivated stuff is filtrated, dried and crashed, finally it is solid phase high temperature crystallized at 900-1200 deg.C to get nm cobalt blue product. The advantage of this invention is that two step ways synthetic technique are used, so the particles can reach nm grade after high temperature crystallization, the particle diameter of cobalt blue particles made is small, the average particle diameter is 30-80nm, and its production technique is simple, energy consumption is relatively low.

Description

technical field [0001] The invention relates to a preparation method of nano cobalt blue, which belongs to the synthesis technology of nano spinel pigment. Background technique [0002] Cobalt blue is an important spinel-type color inorganic pigment, which is a composite oxide with a spinel structure. In a broad sense, the spinel composite oxide is a class in which the sum of the positive oxidation values ​​of the cations in its simplest formula is +8, while the negative oxidation value -8 is provided by four -2 oxygens. composite oxides. For example, cobalt blue with the simplest chemical formula can be expressed by the following formula: CoAl 2 o 4 , also known as cobalt aluminate blue. In practical application, the cations in it can be replaced by some different kinds and numbers of cations, so that mixed-phase pigments with different shades or different hues can be prepared. [0003] Compared with other blue pigments, cobalt blue pigments are characterized by good h...

Claims

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Application Information

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IPC IPC(8): C09C1/62
Inventor 杨桂琴
Owner TIANJIN UNIV
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