Method for synthesizing DSD (4, 4'-diaminostilbene-2, 2'-disulfonic) acid-triazine fluorescent brightening agents

A technology of fluorescent whitening agent and acid triazine, applied in the field of fluorescent whitening agent, can solve problems such as increasing production cost, and achieve the effects of reducing production cost, eliminating cost increase and pollution problems, and improving utilization rate
CN103205134AActive Publication Date: 2013-07-17ZHEJIANG TRANSFAR WHYYON CHEM +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG TRANSFAR WHYYON CHEM
Publication Date
2013-07-17

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Abstract

The invention discloses a method for synthesizing DSD (4, 4'-diaminostilbene-2, 2'-disulfonic) acid-triazine fluorescent brightening agents. A DSD acid-triazine fluorescent brightening agent reaction system is improved to a certain degree by an existing method, and on the basis of comprehensive consideration in various aspects such as the reaction cost, expanded production is carried out but only can be implemented by means of simply expanding reaction equipment. The method is characterized by comprising salifying all organic amine NH<2>R<2> and DSD acid of raw materials for tertiary condensation reaction or parts of the organic amine NH<2>R<2> and DSD acid to obtain DSD acid organic ammonium salt aqueous solution; and sequentially enabling the DSD acid organic ammonium salt aqueous solution to perform primary condensation reaction, secondary condensation reaction and tertiary condensation reaction to obtain the DSD acid-triazine fluorescent brightening agents. The method has the advantages that optional compounds or auxiliaries except for reactants are omitted in reaction procedures; the burden of desalination in an aftertreatment procedure caused by addition of extra salt in an existing method for manufacturing DSD acid-triazine fluorescent brightening agents is relieved, and the problem of foaming due to additional surfactants is solved; the COD (chemical oxygen demand) of waste liquor and the total quantity of the waste liquor are reduced; and problems of increase of cost and pollution due to organic solvents utilized in primary condensation reaction in the existing method are solved.
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Description

technical field

[0001] The invention relates to the field of fluorescent whitening agents, in particular to a method for synthesizing DSD acid triazine fluorescent whitening agents. Background technique

[0002] With the improvement of living standards, people's requirements for color are getting stronger. Because the fluorescent whitening agent has the effects of whitening, brightening and brightening, it meets people's visual requirements. Due to the strong whitening effect of DSD acid triazines, its series of products are basically low-toxic or non-toxic, and have good affinity with fibers. DSD acid triazine fluorescent whitening agents are used in textiles, detergents, and paper industries. has been widely applied. Therefore, it is of practical significance to improve the synthesis process of such fluorescent whitening agents.

[0003] DSD acid triazine series fluorescent whitening agent, its general chemical structure is as follows:

[0004]

[0005] In the formu...

Claims

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