Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A technology of pigment red and aminotoluene, which is applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems that cannot be easily removed, and achieve the effect of reducing usage and high safety

Active Publication Date: 2012-11-21
DIC CORP
View PDF2 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • C.I. pigment red 57:1 and manufacturing method thereof
  • C.I. pigment red 57:1 and manufacturing method thereof

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
reaction rate constantaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09B29/15C09B41/00C09B63/00
CPCC09B29/106C09B41/008
Inventor 绪方晃洋小林永年大坪惠子
Owner DIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com