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Cobalt-containing black particle pigment

A black pigment, granular technology, applied in the field of cobalt-containing granular black pigment, can solve problems such as blackness, high resistance deficiency, etc.

Inactive Publication Date: 2007-08-15
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these cobalt oxides are manufactured for the purpose of being used as battery materials, they are still lacking in blackness and high resistance.

Method used

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  • Cobalt-containing black particle pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 80 L of an aqueous sodium hydroxide solution having a pH of 12 was charged into a 200 L reaction vessel. Then, 60L of cobalt sulfate (2 valence) aqueous solution containing 1.2mol / L cobalt (2 valence) is continuously dropped into the aforementioned reaction vessel at a speed of 1L / min, while also continuously adding 12mol / L of sodium hydroxide aqueous solution. The pH of the slurry in the reaction vessel was continuously measured, and the addition rate of sodium hydroxide was adjusted appropriately so that the pH of the slurry became 12. During this period, the temperature of the slurry was maintained at 35° C., and nitrogen gas was continuously blown in at a rate of 5 L / min. 12 L of 12 mol / L sodium hydroxide aqueous solution was used. After the mixing was complete, nitrogen bubbling and stirring was continued for another 30 minutes.

[0040] The obtained cobalt hydroxide (divalent) slurry was filtered and washed, and the obtained hydrous cobalt hydroxide (divalent) ...

Embodiment 2

[0067] Particles were obtained in the same manner as in Example 1 except that the firing temperature was 750°C. The obtained particles were evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.

Embodiment 3

[0069] Particles were obtained in the same manner as in Example 1, except that the pH at the time of producing cobalt hydroxide was changed to 11.2. The obtained particles were evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.

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Abstract

Disclosed is a black pigment having adequate degree of blackness and high electrical resistance at the same time. Specifically disclosed is a granular black pigment containing cobalt which is characterized in that it is composed of an oxide containing at least cobalt and the divalent cobalt content accounts for 40-70% of the total cobalt content. It is preferable that the total cobalt content in a whole particle is 60-80% by mass, and the divalent cobalt content in a whole particle is 20-50% by mass. It is also preferable that the primary particle diameter is 0.02-0.6 mum.

Description

technical field [0001] The present invention relates to a cobalt-containing granular black pigment. More specifically, the present invention relates to a coloring composition for a black matrix, a black electrode for a plasma display, a plasma addressing liquid crystal, etc., and an excellent blackness for forming a light-shielding layer, etc., A cobalt-containing granular black pigment having high electrical resistance is characterized in that cobalt (divalent) is contained in a specific ratio in all cobalt contained in the granular black pigment. Background technique [0002] Black pigments used in paints, inks, toners, rubber and plastics, etc. need to have excellent blackness, color tone, tinting strength, covering power, etc., and are cheap. Iron oxide systems represented by carbon black or magnetite Pigments and other composite oxide pigments can be used depending on the application. [0003] Typical examples of black pigments mainly composed of metal oxides include m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 星野智之胜山幸一藤安升一中岛贵志
Owner MITSUI MINING & SMELTING CO LTD