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A kind of preparation method of pigment red 57:1

A pigment red and process technology, applied in chemical instruments and methods, organic dyes, azo dyes, etc., can solve the problems of low pigment dispersion and tinting strength, and achieve the effect of changing particle size and shade, and improving transparency.

Active Publication Date: 2022-06-17
PENGLAI XINGUANG PIGMENT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pigments prepared by this method have disadvantages such as low dispersibility and low tinting strength.

Method used

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  • A kind of preparation method of pigment red 57:1
  • A kind of preparation method of pigment red 57:1

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: (1) 187.2g (1mol) of 4-aminotoluene-3-sulfonic acid and 120g (1.5mol) of sodium hydroxide solution with a mass fraction of 50% were added to a reaction flask with a stirring device, 4B After the acid is completely dissolved, the temperature is lowered, and 283.9 g (2.8 mol) of a 36% hydrochloric acid solution is added at 0°C. After stirring for 5 minutes, 236.9 g (1.03 mol) of a 30% aqueous sodium nitrite solution is added. , the reaction was stirred for 35 min, and then 194.3 g (1.05 mol) of a 40% calcium hydroxide solution was added thereto, followed by stirring for 5 min.

[0032] (2) Add 178.8g (0.95mol) of 2,3-acid, 98.8g (1.235mol) of sodium hydroxide solution with a mass fraction of 50%, 2-aminophenol-4 to another reaction flask with a stirring device - 1.35g of sulfonic acid and 1.35g of 1-amino-2-naphthol-4-sulfonic acid, stir and dissolve at 25°C and continue to react for 20min, then add dodecylbenzenesulfonic acid triethanolamine 21.2g, continue S...

Embodiment 2

[0035] Example 2: (1) 187.2g (1mol) of 4-aminotoluene-3-sulfonic acid and 160g (2mol) of sodium hydroxide solution with a mass fraction of 50% were added to a reaction flask with a stirring device, 4B acid After being completely dissolved, the temperature was lowered, and 354.9 g (3.5 mol) of hydrochloric acid solution with a mass fraction of 36% was added at 10° C. After stirring for 10 min, 241.5 g (1.05 mol) of a 30 % aqueous sodium nitrite solution was added thereto, The reaction was stirred for 39 min, and then 207.2 g (1.12 mol) of a 40% calcium hydroxide solution was added thereto, followed by stirring for 10 min.

[0036] (2) Add 182.6 g (0.97 mol) of 2,3-acid, 116.4 g (1.455 mol) of sodium hydroxide solution with a mass fraction of 50%, 1-amino-2- Naphthol-4-sulfonic acid 1.52g and 3-amino-4-methoxybenzenesulfonic acid 3.04g, stir and dissolve, stir and dissolve at 30°C, continue to react for 30min, then add 29.7g of 4-hydroxybutyrate hydrazine, continue Stir for 20 ...

Embodiment 3

[0039] Example 3: (1) 187.2g (1mol) of 4-aminotoluene-3-sulfonic acid and 140g (1.75mol) of sodium hydroxide solution with a mass fraction of 50% were added to a reaction flask with a stirring device, 4B After the acid is completely dissolved, cool down, add 304.2 g (3.0 mol) of hydrochloric acid solution with a mass fraction of 36% at 5°C, and stir for 5 minutes, add 243.8 g (1.06 mol) of a 30% mass fraction of sodium nitrite aqueous solution to it , the reaction was stirred for 37 min, and then 194.3 g (1.05 mol) of a 40% calcium hydroxide solution was added thereto, followed by stirring for 5 min.

[0040] (2) Add 180.7 g (0.96 mol) of 2,3 acid, 105.6 g (1.32 mol) of sodium hydroxide solution with a mass fraction of 50%, 2-aminophenol-4- 1.2 g of sulfonic acid, 1.2 g of 1-amino-2-naphthol-4-sulfonic acid, and 1.2 g of 3-amino-4-methoxybenzenesulfonic acid. After stirring and dissolving, the reaction was continued for 20 min at 25°C. , and then 25.4 g of 4-hydroxybutyl acry...

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Abstract

A process for preparing C.I. Pigment Red 57:1, through process improvement and adding 2-aminophenol-4-sulfonic acid, 1-amino-2-naphthol-4-sulfonic acid or 3-amino-4-methoxy Benzenesulfonic acid is used as the second coupling component to weaken the force between particles and change the particle size and color. Non-toxic substances and dispersants, enhance the coloring power, effectively control the growth of pigment crystals, increase fluidity, use microwave drying to improve drying efficiency, avoid crystal form dehydration transformation, jet mill drying reduces the average particle size of pigments, and increases coloring strength. The pigment prepared by the technology of the invention effectively solves the problems of poor fluidity, low coloring strength and the like of traditional pigments.

Description

technical field [0001] The invention belongs to the technical field of organic raw material preparation, and in particular relates to a preparation method of C.I. Pigment Red 57:1. Background technique [0002] Organic pigments are an important class of colored substances used for coloring objects. Compared with inorganic pigments, it not only has a wide variety and complete chromatogram, but also has bright colors and high tinting strength. C.I. Pigment Red 57 is the most important pigment for high-quality printing red ink. Its lake salts include calcium, strontium, barium, and manganese. Among them, calcium salts are the most widely used, which is C.I. Pigment Red 57:1, accounting for about the output of red pigments. a quarter of . [0003] C.I. Pigment Red 57:1, also known as Lisol Baohong, the existing preparation technology mainly consists of diazotization of 4-aminotoluene-3-sulfonic acid (4B) under the conditions of pH<2 and temperature<5°C, and then Couplin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B67/20C09B29/03C09B29/26C09B29/30C09B29/08
CPCC09B67/0065C09B29/0007C09B29/26C09B29/30C09B29/0834
Inventor 徐珍香郑智剑
Owner PENGLAI XINGUANG PIGMENT CHEM
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