Method for preparing water-soluble ink jet dye

A water-soluble dye technology, applied in the direction of organic dyes, etc., can solve the problems of poor storage stability and achieve the effect of best storage stability and excellent solubility

Active Publication Date: 2014-03-12
JINHUA SHUANGHONG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing water-soluble inkjet dyes, so as to solve the problem of poor storage stability at low temperature after the original powdery inkjet dyes are formulated into solutions

Method used

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  • Method for preparing water-soluble ink jet dye
  • Method for preparing water-soluble ink jet dye
  • Method for preparing water-soluble ink jet dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Rhodamine B is used as the water-soluble primary dye.

[0021] The structural formula of acid rose red B (C.I.Acid Red 52) is as follows:

[0022]

[0023] 4000 parts of deionized water, add 1000 parts of rhodamine B filter cake (water content: 40%), heat up to 50-60°C, and filter after complete dissolution. The filtrate is adjusted to PH=3 with dilute hydrochloric acid, desalinated by nanofiltration membrane (pressure 25bar, temperature 40-50°C), and after the chloride ion concentration is less than 2000mg / kg (converted to 500%), it is separated with triisopropanolamine solution. Adjust the pH of the dye solution in stages to 4.0, 5.0, 6.0, 7.0, continue desalting until the chloride ion concentration is less than 200 mg / kg (converted to 500%), concentrate to 2000 parts, and spray dry to obtain 660 parts of inkjet dye.

Embodiment 2

[0025] Rhodamine B is used as the water-soluble primary dye.

[0026] 4000 parts of deionized water, add 1500 parts of rhodamine B filter cake (water content: 40%), heat up to 50-60°C, and filter after complete dissolution. The filtrate is desalinated by nanofiltration membrane (pressure 25bar, temperature 40-50℃), after the chloride ion concentration is less than 5000mg / kg (converted into 200%), add 150 parts of triethanolamine, add 130 parts of hydrochloric acid (31%), continue Desalting until the chloride ion concentration is less than 200 mg / kg (converted to 500%), concentrated to 2000 parts, and spray-dried to obtain 400 parts of inkjet dye.

Embodiment 3

[0028] The water-soluble primary dye adopts direct turquoise blue FBL.

[0029] The structural formula of direct turquoise blue FBL (C.I.Direct Blue 199) is as follows:

[0030]

[0031] Add 1000 parts of direct turquoise blue FBL filter cake (48% water content) to 4000 parts of deionized water, heat up to 50-60 °C, and filter after completely dissolving. The filtrate is desalinated by nanofiltration membrane (pressure 30bar, temperature 40-50°C), after the chloride ion concentration is less than 5000mg / kg (converted into 200%), add 75 parts of diisopropanolamine, add hydrochloric acid (31%) 66 parts, continue desalting until the chloride ion concentration is less than 300 mg / kg (converted into 200%), concentrate to 1500 parts, and spray dry to obtain 460 parts of inkjet dye.

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Abstract

The invention relates to a method for preparing a water-soluble ink jet dye. The method comprises the following steps of: adding deionized water into the original water-soluble dye to prepare 10 to 20 weight percent of dye aqueous solution; filtering; desalinating by a nanofiltration membrane at the temperature of between 25 and 70 DEG C under the pressure of 10 and 35 bar, performing salt displacement by a salt displacing agent under the acidic condition, and continuing to desalinate until the content of chloride ions in the dye aqueous solution is controlled to be 20 to 80 mg / kg; and spray-drying to obtain the ink jet dye, wherein before the dye aqueous solution is spray-dried, the concentration of the dye aqueous solution is controlled to be 15 to 40 weight percent. The water-soluble ink jet dye has high dissolubility and storage stability, and is particularly suitable to be used as ink jet printing ink.

Description

technical field [0001] The invention relates to a preparation method of inkjet dye, in particular to a preparation method of water-soluble inkjet dye. Background technique [0002] With the continuous development of inkjet printing technology, inkjet printing technology is more and more widely used in the daily home and office fields, and its application in the field of digital printing and digital inkjet printing has also been greatly improved. As one of the main consumables for inkjet printing The demand for inkjet inks is also increasing. At the same time, as people's awareness of environmental protection continues to increase, the demand for water-soluble inks is increasing. The storage stability of inkjet ink is a crucial index to measure the excellence of inkjet ink, which puts extremely high requirements on inkjet dyes. [0003] Traditional inkjet dye products contain a lot of salt, and their performance often fails to meet the requirements of inkjet. Even after a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B67/24C09B67/36C09B67/00
Inventor 徐建成章国栋
Owner JINHUA SHUANGHONG CHEM CO LTD
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