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Preparation method of pigment red 146

A pigment red and red-based technology, used in the preparation of pigment red 146, can solve the problems that pigment red cannot achieve bright luster, poor dispersion stability, and high viscosity of pigment red, and achieve excellent solubilization and dispersion effect, strong tinting strength, light high brightness effect

Active Publication Date: 2019-09-27
HANGZHOU HONGYAN PIGMENT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems of Pigment Red 146 in the application of pigment printing paste are high viscosity and poor dispersion stability of the paste
The patent with the application number CN201610959477.1 proposes "a dispersible pigment red for food packaging and its preparation method". The dispersible pigment red is prepared through the occasional reaction with reasonable control of the proportion, so as to solve the problem that the pigment red cannot achieve bright luster, high tinting strength and The problem of good dispersion and balance, but the pigment red obtained by this method has high viscosity and poor dispersion stability

Method used

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  • Preparation method of pigment red 146

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Effect test

Embodiment 1

[0047] A preparation method of Pigment Red 146, comprising the following steps:

[0048](1) Mix 100kg of deionized water, 7kg of Red Base No. 1, 10kg of 25% hydrochloric acid and 8kg of glacial acetic acid, stir for 15 minutes until dissolved, then cool down to 4°C, add 25% sodium nitrite solution, and react 30min to obtain coupling solution a;

[0049] (2) Dissolve 3kg of sodium hydroxide in 200kg of deionized water, add surfactant No. 1, heat up to 80°C, add naphthol AS-LC to dissolve, and obtain coupling solution b;

[0050] (3) At 35°C, drop the coupling solution b into the coupling solution a for mixing. After reacting for 60 minutes, keep it warm at 80°C for 30 minutes, filter with suction, wash with water until neutral, and dry at 75°C to obtain the finished product.

Embodiment 2

[0052] A preparation method of Pigment Red 146, comprising the following steps:

[0053] (1) Mix 100kg of deionized water, 8kg of Red Base II, 15kg of 30% hydrochloric acid and 10kg of glacial acetic acid, stir for 15 minutes until dissolved, then cool down to 3°C, add 35% sodium nitrite solution, React for 35 minutes to obtain coupling solution a;

[0054] (2) Dissolve 5kg of sodium hydroxide in 200kg of deionized water, add surfactant No. 2, heat up to 95°C, add naphthol AS-LC to dissolve, and obtain coupling solution b;

[0055] (3) At 30°C, drop the coupling solution a into the coupling solution b for mixing, react for 70 minutes and then keep warm at 95°C for 30 minutes, filter with suction, wash with water until neutral, and dry at 85°C to obtain the finished product.

Embodiment 3

[0057] A preparation method of Pigment Red 146, comprising the following steps:

[0058] (1) Mix 100kg of deionized water, 7.5kg of Red Base No. 3, 12kg of 28% hydrochloric acid and 9kg of glacial acetic acid, stir for 10 minutes until dissolved, then cool down to 4°C, and add 30% sodium nitrite solution , reacted for 32 minutes to obtain coupling solution a;

[0059] (2) Dissolve 4kg of sodium hydroxide in 200kg of deionized water, add surfactant No. 3, heat up to 90°C, add naphthol AS-LC to dissolve, and obtain coupling solution b;

[0060] (3) At 25°C, slowly drop the coupling solution a into the coupling solution b for mixing, react for 65 minutes, then keep it warm at 85°C for 30 minutes, filter with suction, wash with water until neutral, and dry at 80°C to obtain the finished product.

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Abstract

The invention relates to the technical field of organic pigment, and particularly relates to a preparation method of pigment red 146. Through performing a coupling reaction and reasonably controlling the reaction temperature and the drying temperature, the obtained pigment red 146 is uniform and stable in dispersion, and relatively low in viscosity.

Description

technical field [0001] The invention relates to the technical field of organic pigments, in particular to a preparation method of Pigment Red 146. Background technique [0002] Pigment Red 146 has strong blue light, bright shade and excellent heat resistance. Mainly used in pigment printing paste, ink, water-based paint, local very good solvent resistance. Pigment Red 146 has good light fastness in pigment printing paste, 1 / 1 standard color depth products are 7 grades, and 1 / 3 standard color depth products are 6~7 grades. At present, the main problems of Pigment Red 146 in the application of pigment printing paste are high viscosity and poor dispersion stability of the paste. The patent with the application number CN201610959477.1 proposes "a dispersible pigment red for food packaging and its preparation method". The dispersible pigment red is prepared through the occasional reaction with reasonable control of the proportion, so as to solve the problem that the pigment red...

Claims

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Application Information

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IPC IPC(8): C09B29/20C09B67/36C09B67/20
CPCC09B29/20C09B67/0063C09B67/0079
Inventor 陆建伟何夏珍丁方敏
Owner HANGZHOU HONGYAN PIGMENT CHEM
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