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Direct yellow 86 dye and preparation method thereof

A yellow dye, direct technology, applied in the preparation of azo dyes, azo dyes, organic dyes, etc., can solve the problems of difficult and effective separation, the liquid phase purity is only about 80%, and the production cost remains high.

Inactive Publication Date: 2015-07-08
SHANGHAI SERUDAN DYESTUFF CHEM
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  • Claims
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Problems solved by technology

[0003] The synthetic method of existing direct yellow 86, amino C acid (diazo component) diazotization, carries out coupling reaction with m-toluidine (coupling component) then, because the amino-ortho and para-position of m-toluidine all have The ability of the coupling reaction makes the components of the coupling product more complicated, and it is not easy to effectively separate, so a single para-coupling product cannot be obtained, and the liquid phase purity of the finished product is only about 80%, and the lower purity seriously affects the shade of the dye. Solubility and stability, at the same time, the low yield (about 50-60%) of the old synthesis process caused the high production cost, which made the dye have great defects and limitations in the field of inkjet printing applications

Method used

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  • Direct yellow 86 dye and preparation method thereof
  • Direct yellow 86 dye and preparation method thereof
  • Direct yellow 86 dye and preparation method thereof

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preparation example Construction

[0037] The preparation method of Direct Yellow 86 dyestuff, step 1, add water, sodium bisulfite to the enamel pot, heat up to 40-60°C, add formaldehyde to react for one hour, and synthesize intermediate product 1:

[0038] CH 2 O+NaHSO 3 →HO-CH 2 SO 3 Na;

[0039] Step 2, add m-toluidine to the above intermediate product solution, control the temperature at 40-60°C, react at a pH of 6-9, and obtain intermediate product 2 by suction filtration:

[0040]

[0041] Step 3: Add water, amino acid, ice, and hydrochloric acid into the pot, and add sodium nitrite solution at 0-5°C under stirring to carry out diazonium reaction. The addition time is 1 hour to obtain diazonium turbidity containing diazonium salt. liquid, see formula 3:

[0042]

[0043] Step 4, slowly add the filter cake to the diazonium turbid liquid with diazonium salt, maintain the neutral medium with soda ash solution, and add the time for one hour to obtain a yellow dye A, see formula 4:

[0044]

[0...

Embodiment 1

[0054] Step 1 Synthesis of intermediate product 1: Add 100 parts of water and 20 parts of sodium bisulfite to a 250ml beaker, raise the temperature to 60°C, and add 5.6 parts of formaldehyde to react for one hour.

[0055] Step 2 Reaction of the above-mentioned intermediate product with m-toluidine: keep the temperature of the above-mentioned intermediate product solution at 60° C., slowly add 20 parts of m-toluidine, react for 1 hour, add 25 parts of salt, salt out and suction filter to obtain a filter cake.

[0056] Step 3 Amino C acid diazo: Add 200 parts of water to a 1000ML beaker, add 52.7 parts of amino C acid, beat for 30 minutes, add 10.15 parts of quantitative hydrochloric acid, add an appropriate amount of ice to cool down to 0-5°C, keep the temperature, and quickly add 12.5 parts of sodium nitrite, keep Congo red test paper dark blue, potassium iodide test paper slightly blue, react at a temperature of 5-10°C for 3 hours.

[0057] Step 4 Coupling: After the diazo is ...

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Abstract

The invention relates to the field of fine chemical engineering and especially relates to direct yellow 86 dye. The direct yellow 86 dye has a structural formula shown in the following description. The direct yellow 86 dye has good performances in ink-jet printing application and has a wide prospect.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a compound and a preparation method thereof. Background technique [0002] Direct Yellow 86 is an important dye for inkjet printing. Dyestuffs generally used for inkjet printing have the following requirements: high purity (HPLC purity of at least 99%), extremely low salt content and heavy metal elements, low viscosity, high surface tension, good solvent compatibility and storage stability . In particular, dye purity is one of the main indicators affecting the performance of inkjet inks. [0003] The synthetic method of existing direct yellow 86, amino C acid (diazo component) diazotization, carries out coupling reaction with m-toluidine (coupling component) then, because the amino-ortho and para-position of m-toluidine all have The ability of the coupling reaction makes the components of the coupling product more complicated, and it is not easy to effectively separate, so a sing...

Claims

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Application Information

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IPC IPC(8): C09B43/32
Inventor 施卫斌郑文军刁正平
Owner SHANGHAI SERUDAN DYESTUFF CHEM
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