Method for preparing aqueous food-grade pigment PR49:1

A water-based food and water-based pigment technology, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of low tinting strength, poor storage stability, poor gloss, etc., and achieve high tinting strength and gloss, Good storage stability, easy separation effect

Active Publication Date: 2019-04-26
JIANGSU LYNWON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a kind of preparation method of water-based food grade organic pigment red 49:1, to solve the high viscosity, low tinting power and relatively high gloss when the pigment red 49:1 produced by the existing technology is applied in the water-based medium. Poor, especially poor storage stability, easy to swell

Method used

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  • Method for preparing aqueous food-grade pigment PR49:1
  • Method for preparing aqueous food-grade pigment PR49:1
  • Method for preparing aqueous food-grade pigment PR49:1

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of diazo solution

[0039] Add 1000L of water into the diazotization reactor, and add 100Kg (industrial grade, 98%, about 0.439×10 3 mol) 2-naphthylamine-1-sulfonic acid (Turbic acid) and 0.3Kg (technical grade, 98%, about 0.00132×10 3 mol) the second diazo component 2-naphthylamine-6-sulfonic acid, add sodium hydroxide (concentration 30%) 64-65Kg, pH value 7.5-8, dissolve and cool to 0 ℃, then add 130Kg hydrochloric acid (concentration 30%) %) for acidification, 31Kg (30% concentration solution) sodium nitrite was added within 30 minutes for diazotization reaction, the temperature was 5-10°C, and stirred for 60 minutes until the KI test paper was slightly blue, ready for coupling.

[0040] Wherein sodium hydroxide and 2-naphthylamine-1-sulfonic acid mol ratio are 1.08:1;

[0041] The molar ratio of 2-naphthylamine-6-sulfonic acid to 2-naphthylamine-1-sulfonic acid is 0.003:1;

[0042] The molar ratio of hydrochloric acid to 2-naphthylamine-1-sulfonic...

Embodiment 2

[0058] Embodiment 2 differs from Embodiment 1 in that:

[0059] In the preparation step of the chemical material liquid: the addition amount of the water-based pigment modifier is 13Kg, which is 5.4% of the dry weight of the obtained pigment.

Embodiment 3

[0061] Embodiment 3 differs from Embodiment 1 in that:

[0062] In the preparation step of the chemical material liquid: the addition amount of the water-based pigment modifier is 18Kg, which is 7.5% of the dry weight of the obtained pigment.

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PUM

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Abstract

The invention discloses a method for preparing an aqueous food-grade pigment PR49:1 and belongs to the field of aqueous food-grade organic pigments. The method comprises the following steps: preparinga heavy nitrogen liquid, preparing a chemical liquid, carrying out a coupling reaction, carrying out a color lake reaction and carrying out aftertreatment, wherein a secondary heavy nitrogen component 2-naphthylamine-6-sulfonic acid is used in the step of preparing the heavy nitrogen liquid; secondary coupling components 1-hydroxy-2-naphthoic acid and an aqueous pigment modifier are used in a step of preparing a coupling liquid. The obtained aqueous food-grade organic pigment red 49:1 has lower viscosity and higher coloring performance and glossiness, and is excellent in storage stability.

Description

technical field [0001] The invention belongs to the field of water-based food packaging organic pigments, and relates to a preparation method of water-based food-grade pigment PR49:1. Background technique [0002] At present, water-based food-grade pigment red 49:1 is widely used in water-based color paste systems, and belongs to azo lake organic pigments. This kind is barium salt lake, which gives a neutral red color. The process is mostly: dissolving 2-naphthylamine-1-sulfonic acid in sodium hydroxide solution, then adding hydrochloric acid for acid analysis, then adding sodium nitrite solution dropwise, and reacting for 1 hour to obtain diazonium liquid; Sodium hydroxide solution was dissolved to obtain the coupling solution; and the coupling method of positive coupling was adopted. After the reaction was completed, barium chloride solution was added to carry out the laking reaction, and finally filtered, washed, and dried to obtain Pigment Red 49:1. However, the Pigment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B63/00C09B29/03C09B29/15
CPCC09B29/0014C09B29/103C09B29/106C09B63/005
Inventor 张晓明刘晴尧胡磊
Owner JIANGSU LYNWON TECH CO LTD
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