Azo-dyes congo layered hydrotalcite and preparation thereof

A technology of azo dyes and hydrotalcites, which is applied in the direction of azo dyes, azo dye complex metal compounds, organic dyes, etc., can solve the problems of easy decolorization and fading, poor light and heat stability, etc., to improve light and heat stability, The effect of improving heat resistance stability

Inactive Publication Date: 2008-10-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the research and application of Congo red, people found that Congo red also has the disadvantages of poor photothermal stability and easy decolorization and fading when it is used as a printing and dyeing dye. Therefore, we expect to find a way to improve its photothermal stability to expand Applications of Congo Red

Method used

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  • Azo-dyes congo layered hydrotalcite and preparation thereof
  • Azo-dyes congo layered hydrotalcite and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Step A: take by weighing 71.39g Zn(NO 3 ) 2 ·6H 2 O and 45.02g Al(NO 3 ) 3 9H 2 O dissolved in 200ml to remove CO 2 Mixed salt solution was prepared in deionized water, and another 27.36g NaOH was dissolved in 200ml deCO 2 Alkaline solution was prepared in deionized water. The prepared solution was rapidly mixed in a fully back-mixed rotating liquid film nucleation reactor, and after vigorous circulation and stirring for 2 minutes, the resulting slurry was placed in a reaction kettle for crystallization at 100° C. for 14 hours. deCO 2 The crystallized product was fully washed with deionized water to pH3 -LDHs precursor, whose Zn 2+ / Al 3+ =2.

[0020] Step B: According to the molar ratio of the azo dye Congo red and the hydrotalcite precursor being 2, first weigh 3.48g of Congo red and dissolve it in 40ml to remove CO 2 in deionized water; then weigh 4.06g of the filter cake prepared in step A and dissolve it in 60ml of deCO 2 In deionized water, oscillate i...

Embodiment 2

[0024] Step A: take by weighing 46.15g Mg(NO 3 ) 2 ·6H 2 O and 33.76g Al(NO 3 ) 3 9H 2 O dissolved in 150ml deCO 2 Prepare a mixed salt solution in deionized water, and dissolve another 21.60g NaOH in 150ml deCO 2 Alkaline solution was prepared in deionized water. The prepared solution was rapidly mixed in a fully back-mixed rotary liquid film nucleation reactor, and after vigorous circulation and stirring for 2 minutes, the obtained slurry was placed in a reaction kettle for crystallization at 100° C. for 4 hours. deCO 2 The crystallized product was fully washed with deionized water to pH3 -LDHs precursor, its Mg 2+ / Al 3+ =2.

[0025] Step B: According to the molar ratio of the azo dye Congo red and the hydrotalcite precursor being 2, first weigh 3.48g of Congo red and dissolve it in 40ml to remove CO 2 in deionized water; then weigh 5.12g of the filter cake prepared in step A and dissolve it in 60ml of deCO 2 In deionized water, oscillate in an ultrasonic genera...

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Abstract

Disclosed are an azo dye congo-red intercalated hydrotalcite and the preparation method, with the following chemical formula: (M2+(1-x) M3+xOH2)x+ (C32H22N6O6S22-)b*mH2O. First of all, a hydrotalcite precursor with the interlaminar anions being NO3- or Cl- is prepared through nucleation or crystallization isolation, then the azo dye congo-red anions substitute for the interlaminar anions through hydrothermal ion exchange and enter the interlayers of the hydrotalcite to compose the anionic supramolecular layered material of the azo dye congo-red anionic intercalated hydrotalcite. The preparation method is as follows: firstly, the hydrotalcite precursor is prepared through nucleation or crystallization isolation; then the precursor is processed with hydrothermal ion exchange reaction with congo-red solution in a reactor to obtain the hydrotalcite composite material of azo dye congo-red bivalent anionic intercalation. The method of the invention has the advantages that the azo dye anions with larger ion radius are successfully introduced into the interlayers of the hydrotalcite, and the optical thermal stability of intercalated products is also greatly improved.

Description

technical field [0001] The invention belongs to the technical field of azo dyes, and is characterized in that a kind of azo dye Congo red (C 32 h 22 N 6 Na 2 o 6 S 2 ) intercalated hydrotalcite and its preparation method. Background technique [0002] Azo dye is a kind of dye with one or more azo bonds in the molecule. This kind of dye is made by diazotizing the amino group on the aromatic amine with sodium nitrite in an acidic medium, and then reacting with a suitable It is formed by the coupling reaction of aromatic amines or phenols. Among the synthetic dyes, azo dyes are the largest type of dyes, accounting for about 60% of the world's dyes, including acid, alkaline, ice dyeing, direct, disperse, reactive, medium, solvent dyes and organic pigments etc.; at the same time, azo dyes are also the most widely used dyes. However, since the azo dye molecule has an azo group that is easy to participate in oxidation and reduction reactions, it is easy to undergo a reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B45/24
Inventor 王连英尹平李仓
Owner BEIJING UNIV OF CHEM TECH
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