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Aqueous dispersion of carbon black and method of producing the same

A water-based dispersion, carbon black technology, applied in chemical instruments and methods, inorganic pigment treatment, inks, etc., can solve problems such as difficulty in accurately determining the dispersibility of carbon black, reduced atomization effect, and difficulty in forming functional groups on the surface of carbon black.

Inactive Publication Date: 2008-07-30
TOKAI CARBON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to accurately determine the dispersibility of carbon black based only on the number of functional groups per unit weight of carbon black
When using a method (i.e. micro-atomizing carbon black with glass beads in water and treating its surface with hypohalite to oxidize the carbon black) to improve dispersibility, the atomization effect is will be lowered
Moreover, since it is difficult to form active sites, it is difficult to uniformly form functional groups on the surface of carbon black

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] To 3000 ml of a 2.0N ammonium persulfate solution, 150 g of carbon black (Seast 9, manufactured by Tokai Carbon Co. Ltd.) was added. The mixture was then stirred (300 rpm) and subjected to liquid phase oxidation at 60° C. for 10 hours. After removing reduced salts from the slurry using an ultrafiltration membrane (AHP-1010, manufactured by Asahi Kasei Corporation; molecular weight cutoff: 50,000), oxidized carbon black was filtered off. The carboxyl group content and hydroxyl group content of carbon black were measured using the following methods. The carboxyl group content was 450 μmol / g and the hydroxyl group content was 250 μmol / g.

[0041] (1) Measurement of carboxyl group content: Add about 2g to 5g of oxidized carbon black to 0.976N aqueous sodium bicarbonate solution. The mixture was shaken for 6 hours, then it was filtered. Carboxyl content was measured by titration.

[0042] (2) Measurement of hydroxyl content: 2,2'-diphenyl-1-picrylphenylhydrazine (DPPH) w...

Embodiment 2

[0046] A carbon black aqueous dispersion was prepared in the same manner as in Example 1, except that L-lysine was used instead of L-arginine.

Embodiment 3

[0048] A carbon black aqueous dispersion was prepared in the same manner as in Example 1, except that an aqueous ammonia solution was used instead of an aqueous sodium hydroxide solution.

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Abstract

The invention discloses an aqueous dispersion of carbon black, which exhibits excellent dispersibility in an aqueous medium, and exhibits excellent wear resistance (quick drying), jetting stability, etc., and can be used as an inkjet printer Water-based black ink, etc. The carbon black aqueous dispersion includes an aqueous medium and carbon black dispersed in the aqueous medium, and the acidic groups formed by liquid-phase oxidation on the surface of the carbon black use basic amino acids and a base other than basic amino acids The neutralization of the acidic compound, the hydrogen atom of the acidic group is replaced by the basic amino acid and the basic compound. Also disclosed is a method for the preparation of an aqueous dispersion of carbon black, which comprises liquid-phase oxidation of carbon black, removal of reducing salts from the resulting slurry, neutralization of carbon black with basic amino acids and basic compounds other than basic amino acids, making The basic amino acid and basic compound replace the hydrogen atom of the acidic group, and the resulting product is purified.

Description

technical field [0001] The invention relates to a carbon black water-based dispersion suitable for water-based black ink of inkjet printers and the like and a preparation method thereof. Background technique [0002] Carbon black exhibits hydrophobicity and low wettability to water. Therefore, it is difficult to stably disperse carbon black in water at a high concentration. This is because the surface of carbon black has only a small amount of functional groups exhibiting high affinity with water molecules (for example, hydrophilic hydrogen-containing functional groups such as carboxyl and hydroxyl groups). Various methods have been proposed to improve the dispersibility of carbon black in water by oxidizing carbon black to form hydrophilic functional groups on its surface. [0003] For example, JP-A-48-018186 discloses a method of oxidizing carbon black using an aqueous hypohalite solution, and JP-A-57-159856 discloses a method of oxidizing carbon black using low-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/56C01B31/02C09D17/00C09C3/00
CPCC01P2006/22C01P2004/64C09C1/565C09D11/324C01P2004/51
Inventor 堀井俊哉
Owner TOKAI CARBON CO LTD
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