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A kind of preparation method of c.i. pigment red 176

A technology of pigment red and methoxyanilide, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of reducing pigment application performance and increasing costs, and achieve excellent dispersibility, improve quality, and The effect of uniform particle size

Active Publication Date: 2018-04-10
SHANGYU XINLI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, the method of dissolving and re-precipitating is adopted to improve the utilization rate of coupling components, but it will increase a lot of cost, and the precipitated pigment yellow is placed in a strong alkali solution, which will reduce the application performance of the pigment.

Method used

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  • A kind of preparation method of c.i. pigment red 176
  • A kind of preparation method of c.i. pigment red 176
  • A kind of preparation method of c.i. pigment red 176

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 1000kg of water and 160kg of 30% hydrochloric acid into the diazo pot, add 150kg of dried 3-amino-4-methoxyanilide under stirring, beat for 1 hour, cool down to below 0°C with ice, and adjust the volume to 2500L. Add 40% sodium nitrite dissolved in advance (dry 42.5kg sodium nitrite plus 64kg water), measure the end point to keep the potassium iodide starch test paper slightly blue, keep the temperature at 5-10°C, stir for 30 minutes, add 20kg diatomaceous earth, After stirring for 20 minutes, the diazonium salt solution was obtained by filtration.

[0051] Add a small amount of water into the coupling pot, start stirring, and add 186.5kg of 5-(2'-hydroxy-3'-naphthylcarboxamido)-2-benzimidazolone into the coupling pot with water through a colloid mill, and add 0.6kg Stearyl polyoxyethylene ether, beat for 0.5 hours, adjust the volume to 1500L, and adjust the temperature to 0-10°C.

[0052] The diazonium salt solution is slowly added to the beaten 5-(2'-hydroxyl-3'-...

Embodiment 2

[0055] Add 1000kg of water and 220kg of 30% hydrochloric acid into the diazo pot, add 150kg of dried 3-amino-4-methoxyanilide under stirring, beat for 1 hour, cool down to below 0°C with ice, and adjust the volume to 2500L. Add 40% sodium nitrite dissolved in advance (45kg dry sodium nitrite plus 68kg water), measure the end point to keep the potassium iodide starch test paper slightly blue, keep the temperature at 5-10°C, stir for 1 hour, add 20kg diatomaceous earth, stir After 20 minutes, the diazonium salt solution was obtained by filtration.

[0056] Add a small amount of water into the coupling pot, start stirring, add 200kg of 5-(2'-hydroxy-3'-naphthylcarboxamido)-2-benzimidazolone into the coupling pot through a colloid mill, and add 1kg of methyl Sodium naphthalenesulfonate formaldehyde condensate MF, beat for 0.5 hours, adjust the volume to 1500L, and adjust the temperature to 0-10°C.

[0057] The diazonium salt solution is slowly added to the beaten 5-(2'-hydroxyl-3...

Embodiment 3

[0060] Add 1000kg of water and 200kg of 30% hydrochloric acid into the diazonium pot, add 150kg of dried 3-amino-4-methoxyanilide under stirring, beat for 1 hour, cool down to below 0°C with ice, adjust the volume to 2500L, Add 40% sodium nitrite dissolved in advance (43kg dry sodium nitrite plus 65kg water), measure the end point to keep the potassium iodide starch test paper slightly blue, keep the temperature at 5-10°C, stir for 1 hour, add 20kg diatomaceous earth, stir After 20 minutes, the diazonium salt solution was obtained by filtration.

[0061] Add a small amount of water into the coupling pot, start stirring, add 190kg of dried 5-(2'-hydroxy-3'-naphthylcarboxamido)-2-benzimidazolone into the coupling pot through a colloid mill, add 0.8kg of octane Base phenol polyoxyethylene ether emulsifier OP, beat for 0.5 hours, adjust the volume to 1500L, and adjust the temperature to 0-10°C.

[0062] The diazonium salt solution is slowly added to the beaten 5-(2'-hydroxyl-3'-n...

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Abstract

The invention provides a preparation method for a C.I. pigment red 176. The method comprises the following steps: directly grinding 5-(2'-hydroxyl-3'-naphthamido)-2-benzimidazolone with a colloid grinder without the need of dissolving, and adding an emulsifier and carrying out pulping; then adding diazonium salt and carrying out reaction, and carrying out coupling and controlling a pH value of a reaction system by using alkalescent water at the same time so as to guarantee smooth reaction, reduce decomposition of diazonium salt and dissolved state of coupling components, improve reaction efficiency and yield and enhance product quality; and finally, directly adding a solvent into a prepared crude filter cake without the need of drying treatment, and carrying out pigmentation treatment so as to prepare the C.I. pigment red 176. The C.I. pigment red 176 has the advantages of uniform particle size, flabby and soft particles, excellent dispersity, bright color and high tinting strength.

Description

technical field [0001] The invention relates to the technical field of pigment preparation, in particular to a preparation method of C.I. Pigment Red 176. Background technique [0002] Organic pigments are organic coloring substances with special properties. According to different types of pigments, they can be used in plastics, inks, paints, textiles and other industries. The scope of application of a pigment is determined by its application performance. The most important factor in determining how well an application performs is the molecular structure of the pigment. The more complex the molecular structure, the more hydrogen bonds it contains, the better the application performance of the pigment, and the benzimidazolone series pigment is a kind of pigment with complex structure. It can meet the heat resistance of high-grade plastics, and can also meet the water resistance, oil resistance, and solvent resistance of water-based, oil-based, and solvent-based inks; at the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B29/18
CPCC09B29/18
Inventor 陈建新倪越彪章立新方标
Owner SHANGYU XINLI CHEM IND CO LTD
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