Preparation method of C.I. Pigment red 185

A pigment red and pigment technology, which is applied in the field of preparation of C.I. Pigment Red 185, can solve the problems of increasing the cost of wastewater treatment, and achieve the effects of reducing the treatment cost, making the particles soft and reducing the use.

Pending Publication Date: 2022-05-13
SHANGYU XINLI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual coupling process, a large amount of sodium chloride is produced, and the industrial wastewater contains not only organic pollutants, but also sodium chloride, which greatly increases the cost of wastewater treatment

Method used

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  • Preparation method of C.I. Pigment red 185

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of C.I. Pigment Red 185, comprising the steps of:

[0021] Step 1, add hydrochloric acid to water and stir evenly, then add 2-methoxy-4-methylaminosulfonyl-5-methylaniline and beat for 20 minutes at room temperature to obtain 2-methoxy-4-sulfonic acid-5-methyl Aniline slurry, standby; the hydrochloric acid is 30% hydrochloric acid, the mass ratio of the 2-methoxy-4-sulfonic acid-5-methylaniline is 10%, the 2-methoxy-4 - the pH of the sulfonic acid-5-methylaniline slurry is 6.5;

[0022] Step 2, adding aluminum nitrite to water and stirring evenly to dissolve, and adding hydrochloric acid dropwise to adjust the pH to obtain an aluminum nitrite solution; the mass ratio of the aluminum nitrite to water is 1:1.1, and the hydrochloric acid is 30% hydrochloric acid, and the adjusted pH is 6;

[0023] Step 3, put the 2-methoxy-4-sulfonic acid-5-methylaniline slurry into the ice bath, and slowly add the aluminum nitrite solution dropwise, constant tempera...

Embodiment 2

[0027] A preparation method of C.I. Pigment Red 185, comprising the steps of:

[0028] Step 1, add hydrochloric acid to water and stir evenly, then add 2-methoxy-4-methylaminosulfonyl-5-methylaniline and beat for 40 minutes at room temperature to obtain 2-methoxy-4-sulfonic acid-5-methyl Aniline slurry, for subsequent use; the hydrochloric acid is 30% hydrochloric acid, the mass ratio of the 2-methoxyl-4-sulfonic acid-5-methylaniline is 30%, the 2-methoxyl-4 - the pH of the sulfonic acid-5-methylaniline slurry is 6.8;

[0029] Step 2, adding aluminum nitrite to water and stirring evenly to form a solution, and adding hydrochloric acid dropwise to adjust the pH to obtain an aluminum nitrite solution; the mass ratio of the aluminum nitrite to water is 1:1.2, and the hydrochloric acid is 30% hydrochloric acid, and the adjusted pH is 6.5;

[0030] Step 3, put the 2-methoxy-4-sulfonic acid-5-methylaniline slurry into the ice bath, and slowly add the aluminum nitrite solution drop...

Embodiment 3

[0034] A preparation method of C.I. Pigment Red 185, comprising the steps of:

[0035] Step 1, add hydrochloric acid to water and stir evenly, then add 2-methoxy-4-methylaminosulfonyl-5-methylaniline and beat for 30 minutes at room temperature to obtain 2-methoxy-4-sulfonic acid-5-methyl Aniline slurry, standby; the hydrochloric acid is 30% hydrochloric acid, the mass ratio of the 2-methoxyl-4-sulfonic acid-5-methylaniline is 20%, the 2-methoxyl-4 - The pH of the sulfonic acid-5-methylaniline slurry is 6.7;

[0036] Step 2, adding aluminum nitrite to water and stirring evenly to dissolve, and adding hydrochloric acid dropwise to adjust the pH to obtain an aluminum nitrite solution; the mass ratio of the aluminum nitrite to water is 1:1.1, and the hydrochloric acid is 30% hydrochloric acid, and the adjusted pH is 5.3;

[0037] Step 3, put the 2-methoxy-4-sulfonic acid-5-methylaniline slurry into the ice bath, and slowly add the aluminum nitrite solution dropwise, constant tem...

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Abstract

The invention belongs to the technical field of dyes, and particularly relates to a preparation method of C.I. Pigment red 185. The preparation method comprises the following steps: carrying out diazotization reaction on 2-methoxy-4-methylamino sulfonyl-5-methylaniline and aluminum nitrite, reacting with 5-(2 '-hydroxy-3'-naphthoylamido)-2-benzimidazolone to obtain a pigment crude product, carrying out crystal form optimization by virtue of a macromolecular surfactant, and preparing the C.I. Pigment red 185. A product is obtained. The C.I. Pigment red 185 prepared by the invention has the advantages of uniform particle size, soft particles, bright color, strong tinting strength, excellent heat resistance, acid resistance, alkali resistance and no migration.

Description

technical field [0001] The invention belongs to the technical field of dyes, and in particular relates to a preparation method of C.I. Pigment Red 185. Background technique [0002] C.I. Pigment Red 185, N-(2,3-dihydro-2-oxo-5-benzimidazole)-3-hydroxy-4-[[2-methoxy-5-methyl-4-[( Methylamino)sulfonyl]phenyl]diazo]naphthalene-2-carboxamide; 2-naphthylcarboxamide, N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl) -3-Hydroxy-4-((2-methoxy-5-methyl-4-((methylamino)sulfonyl)phenyl)azo); 2-naphthylcarboxamide, N-(2,3 -Dihydro-2-oxo-1H-benzimidazol-5-yl)-3-hydroxyl-4-(2-(2-methoxy-5-methyl-4-((methylamino)sulfonyl acyl)phenyl)diazenyl). [0003] C.I. Pigment Red 185 is an azo pigment, almost insoluble in general organic solvents, and resistant to sterilization; it can be used in printing ink, metal decoration, plastic coloring and other fields. The current preparation method of Pigment Red 185 is to suspend the aggravation of the nitrogen solution after the coupling has been carried ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/01C09B29/20
CPCC09B29/0003C09B29/20
Inventor 戴建国陈建新张百万王茂
Owner SHANGYU XINLI CHEM IND CO LTD
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