Fluorescent whitening agent for textile printing and dyeing

A fluorescent whitening agent, textile printing and dyeing technology, applied in the field of fluorescent whitening agent, can solve the problems of large amount of organic solvent, low yield, dark color of crude products, etc., and achieve the effect of improving product yield, simple process and convenient operation

Inactive Publication Date: 2016-02-03
张天国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to improve the ubiquitous defects of darker crude product color, large amount of organic solvent and lower yield in the existing preparation method of fluorescent whitening agent DT. This product uses o-amino-p-cresol and malic acid as main raw materials. By adding surfactants, combined with steam distillation, the color depth of crude products can be reduced and the product yield can be increased.

Method used

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  • Fluorescent whitening agent for textile printing and dyeing
  • Fluorescent whitening agent for textile printing and dyeing
  • Fluorescent whitening agent for textile printing and dyeing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The proportioning of raw materials and reagents by weight is as follows:

[0021]

[0022] Concrete preparation process is as follows:

[0023] ①In the reaction kettle with agitator, reflux condenser and water separator, first add xylene, then add o-amino-p-cresol, malic acid and boric acid. Nitrogen was fed into the reaction kettle to protect the material, and the temperature of the reactant was raised to 40°C under constant stirring, and kept for 3 hours, and then within 2 hours, the temperature was raised to 145°C, and kept for 8 hours. Toluene is recovered through condensation and phase separation;

[0024] ②Under stirring conditions, when the temperature is lowered to 90°C, steam is passed through for distillation to drive out the remaining xylene;

[0025] ③ Add chlorobenzene, cool the reactant to 540°C, and keep stirring to dissolve all the materials in the reactor;

[0026] ④ Add sodium chloride solution and ethanol polyoxyethylene ether, heat up to 80°C u...

Embodiment 2

[0031] The proportioning of raw materials and reagents by weight is as follows:

[0032]

[0033] Concrete preparation process is with specific embodiment 1.

Embodiment 3

[0035] The proportioning of raw materials and reagents by weight is as follows:

[0036]

[0037] Concrete preparation process is with specific embodiment 1.

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PUM

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Abstract

Belonging to the field of textile printing and dyeing assistant agents, the invention in particular relates to a fluorescent whitening agent for textile printing and dyeing. The fluorescent whitening agent DT has a chemical name of 1, 2-bis(5-methyl-2 benzoxazolyl)ethylene, and is also known as polyester whitening agent DT or terylene whitening agent ERN, and is light yellow crystal. The product provided by the invention adopts amino-p-cresol and malic acid as the main raw materials, and by means of adding the surfactant and combining steam distillation, the of deep color phenomenon of the crude product is alleviated, and the product yield is improved.

Description

technical field [0001] The invention belongs to the field of auxiliary agents for textile printing and dyeing, in particular to a fluorescent whitening agent for textile printing and dyeing. Background technique [0002] In the textile printing and dyeing process, it is necessary to dye the cloth into white. The usual white printing and dyeing method is to use chemical bleaching, but the effect of chemical bleaching is sometimes not ideal, and the newly produced fluorescent bleaching agent has a good effect. Many other industries also use fluorescent whitening agents, such as paper, plastics, leather, detergents, etc. The principle of fluorescent whitening agents is to excite incident light to produce fluorescence, so that the dyed substance obtains a luminous effect similar to fluorite, making it easier to see with the naked eye. The obtained substance is very white. In addition, it can also increase the whiteness of the original white substance. [0003] The chemical name...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06L3/12C07D263/56D06L4/607D06L4/664
Inventor 张天国
Owner 张天国
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