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Water-based disazo dye mixture, and preparation method and application thereof

A disazo dye and disazo technology, applied in dyeing, organic dyes, textiles and papermaking, etc., can solve the problems affecting the storage stability of black liquid mixture, poor sunlight durability, poor water fastness, etc., and achieve excellent Long-term storage stability, good light resistance, good water solubility

Active Publication Date: 2014-07-02
上海贝通色彩科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But they have the main problem: not only the poor water solubility and water fastness due to the large molecules and complex structure, but also the black color becomes bronze after the paper is dyed for a long time.
In U.S. Patent US20080201872, more than three kinds of dyes constituting black are a mixture of anionic dyes and cationic dyes (or acid dyes with a cationic dye structure), which can dye paper or cardboard with high dyeing strength and good light fastness, but each Dye compatibility issues affect storage stability of black liquid mixtures
Korean patent KR1020050106085 (PCT / JP2004 / 002779) relates to a water-based black ink composition containing a condensation compound or a reduced body of 4,4'-dinitrostilbene-2,2'-disulfonic acid and aniline, and the color can reflect Neutral black, but less durable to sunlight

Method used

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  • Water-based disazo dye mixture, and preparation method and application thereof
  • Water-based disazo dye mixture, and preparation method and application thereof
  • Water-based disazo dye mixture, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The present invention relates to the synthesis of a dye (I-1), comprising the following steps:

[0054]

[0055] Step 1: Dissolve 23.8g (99%) neopentyl glycol in 20g water, add 20g ice and 31.64g (99%) sodium nitrite, stir evenly, then slowly add 55.6g of 30% hydrochloric acid, temperature control Stirring was continued for 30 minutes below 5°C, poured into a separatory funnel, and allowed to stand for layers to obtain 36.5 g (98% of theoretical value) of neopentyl glycol dinitrite in the organic layer. RfnD22=1.4070;

[0056] Step 2: Disperse 47.8g of Gamma Acid in 100g of water, stir slowly at room temperature, cool down to below 5°C, add 36.5g of neopentyl glycol dinitrite dropwise, the dropwise addition ends in 2 hours, and the temperature is always controlled at 5°C Below ℃, keep warm for 2 hours, measure the end point with potassium iodide test paper, and remove excess nitrite with sulfamic acid;

[0057] Step 3: Disperse 54.8g of J-Acid urea in 800g of water, ...

Embodiment 2

[0059] The present invention relates to the synthesis of a dye (II-1), comprising the following steps:

[0060]

[0061] Step 1: Add 86.5g (0.2mol, 70.1%) of amino acid C, 300g of water and 53g of 31% concentrated hydrochloric acid to a 500ml three-neck flask equipped with a stirring, thermometer and dropping funnel, stir, and dropwise add A solution composed of 50g (30%, mass ratio) of NaNO2 aqueous solution. After the dropwise addition, react at 5°C for two hours, and urea decomposes excess nitrous acid. Adjust the pH value of the reaction solution to 5-6, add 22 g (0.2 mol) of m-aminotoluene dropwise, and react at 5-10° C. for 0.5 hour after the dropwise addition to obtain a monoazo dye.

[0062] Step 2: Add the monoazo dye obtained in Step 1 to 200ml of buffer solution of disodium hydrogen phosphate with pH=6.5, 1ml of catalyst triethylamine, stir, add 15g of triphosgene in batches, and react at 30°C. During the reaction, 10% NaOH continuously adjusted the pH value to...

Embodiment 3

[0064] The present invention relates to the synthesis of a dye (III-1), comprising the following steps:

[0065]

[0066] Step 1: Disperse 30.4g (0.1mol) of 1-naphthol-3,6-disulfonic acid in 600g of water, adjust the pH of the above solution to 2.5 with 32% hydrochloric acid, and stir to form a uniform suspension. After cooling to 5°C, 54g of ethyl chloroformate was slowly added dropwise within 1 hour, at this time the temperature rose slowly to 32°C, and then 30% sodium hydroxide solution was added to maintain the pH at 2.5. The temperature was maintained at 35°C until there was no change in pH.

[0067] Step 2: In another flask, add 16.8g (0.1mol) 2-amino-5-nitroanisole, 100g water, 35g 30% hydrochloric acid, cool down to about 0°C, add dropwise 14g (50%, mass than) NaNO2 aqueous solution for diazotization reaction, after the dropwise addition, keep warm at 0-5°C for 1 hour, and sulfamic acid removes excess sodium. Then slowly add the diazonium salt into the above solut...

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Abstract

The invention discloses a water-based bisazo black dye mixture, and a preparation method and application thereof. The water-based bisazo black dye mixture is composed of three disazo dyes. The invention also discloses a preparation method of the dye mixture, which comprises the following step: evenly mixing the three dyes for forming the dye mixture to obtain the end product water-based bisazo black dye mixture. The invention also discloses application of the dye mixture for dyeing paper pulp, paper and cloth fiber matters. The black dye mixture has better fastness to light than the fast black in the market, has favorable water solubility, and is easy to filter. The invention can save technical cost. The dye composition disclosed by the invention can also be used in the field of ink jet printing, has excellent long-term storage stability, prolongs the service life of the printer head, can adjust the color light through the mixing proportion, is suitable for the demands for black color paste in the market, and has wide application prospects.

Description

technical field [0001] The invention is a water-soluble ink-jet dye, specifically a water-based disazo dye mixture and its preparation method and application. Background technique [0002] Black dye is the most widely used and most productive color in dyes. With the continuous development of the dye industry, people's requirements for black dyes for paper are also increasing, especially the requirements for light fastness. In the paper industry, more direct dyes C.I. Direct Black 19, C.I. Direct Black 22, C.I. Direct Black 154, C.I. Direct Black 168 and C.I. Direct Black 171 are used. But they have the main problem: not only the poor water solubility and water fastness due to the large molecules and complex structure, but also the black color becomes bronze after the paper is dyed for a long time. And the blackness is not enough when dyed at high concentration. [0003] In recent years, the improvement of the black dye mixture for paper is mainly reflected in the screenin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B67/36C09B67/22D21H21/28D06P1/10
Inventor 李剑锋刘晓光顾小娟
Owner 上海贝通色彩科技有限公司
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