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C.I. pigment red 57:1 and its manufacturing method

A technology of pigment red and hydroxyl, which is applied in the field of C.I. Pigment Red 57:1 and its preparation, can solve the problems that cannot be easily removed, and achieve the effect of reducing usage and high safety

Active Publication Date: 2009-02-11
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

C.I. Pigment Red 57:1 obtained by laking without knowing the remaining 3-hydroxy-2-naphthoic acid naturally contained relatively high concentrations of 3-hydroxy-2-naphthoic acid and its salts as impurities. Cannot be easily removed by washing etc.

Method used

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  • C.I. pigment red 57:1 and its manufacturing method
  • C.I. pigment red 57:1 and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] After dispersing 34.80 parts of 4-aminotoluene-3-sulfonic acid (purity 98.00%) in 50 parts of water, add 22.1 parts of 35% hydrochloric acid, and add 32.4 parts at once while adding ice and water to keep the temperature at 0°C of 40% sodium nitrite. 650 parts of a suspension containing a diazo component are obtained. Next, after dispersing 34.98 parts of 3-hydroxyl-2-naphthoic acid (purity 98.50%) in 400 parts of 50°C water, 69 parts of 25% caustic soda aqueous solution was added and dissolved, and thereafter, ice and water were added to obtain 980 Part 10 ℃ aqueous solution containing coupling agent components.

[0074] The aqueous solution containing this coupling agent composition is all added to the cylindrical stirring tank 5 of volume 2 liters, and the center of stirring tank 5 is assembled as figure 1 As shown, the rotating shaft 1 on which the stirring blade is installed is fixed to the power unit, and the stirring device is installed. Next, the rotating shaf...

Embodiment 2

[0082] Except for 4-aminotoluene-3-sulfonic acid:3-hydroxy-2-naphthoic acid (molar ratio)=1.000:1.002, the same procedure as in Example 1 was carried out to obtain 93 parts of dry pigment powder.

Embodiment 3

[0084] Except for 4-aminotoluene-3-sulfonic acid:3-hydroxy-2-naphthoic acid (molar ratio) = 1.000:1.003, the same procedure as in Example 1 was carried out to obtain 93 parts of dry pigment powder.

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Abstract

Disclosed is C. I. pigment red 57:1 wherein the content of 3-hydroxy-2-naphthoic acid and metal salts thereof as determined by quantitative analysis by liquid chromatography is not more than 2,500 ppm in terms of 3-hydroxy-2-naphthoic acid.

Description

technical field [0001] The present invention relates to C.I. Pigment Red 57:1 containing only a smaller amount of 3-hydroxy-2-naphthoic acid and its metal salt than before, and its preparation method. Background technique [0002] C.I. Pigment Red 57:1 is a red pigment containing calcium bis[2-(3-carboxy-2-hydroxynaphthylazo)-5-toluenesulfonate] as an essential ingredient. The C.I. Pigment Red 57:1 is obtained by coupling the diazonium salt of 4-aminotoluene-3-sulfonic acid with 3-hydroxy-2-naphthoic acid to obtain an azo dye, and then the azo dye is further treated with an inorganic calcium compound It is produced by laking (refer to Patent Document 1 or 2). [0003] Regardless of the stirring efficiency and the strength of the stirring device, the reaction rate in the case of obtaining the diazonium salt of 4-aminotoluene-3-sulfonic acid is 98% or more, which is basically determined stoichiometrically. For this reason, the feed molar ratio of the diazonium salt of 4-amin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/15C09B41/00C09B63/00
CPCC09B29/106C09B41/008
Inventor 绪方晃洋小林永年
Owner DIC CORP
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