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Amphoteric fluorescent whitening agent and preparation method thereof

A fluorescent whitening agent and amphoteric technology, which can be used in bleaching products, adding luminescent/fluorescent substances, textiles and papermaking, etc. It can solve problems such as easy decomposition, reduced fluorescence quantum yield, ultraviolet absorption performance, and fluorescent emission performance. , to achieve the effect of less environmental pollution, more varieties, and simple process

Inactive Publication Date: 2008-09-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of fluorescent whitening agent has the disadvantages of unstable storage and easy decomposition
Patent CN200510104309.6 uses a tertiary amine to directly react with cyanuric chloride to synthesize a new type of quaternary ammonium salt amphoteric fluorescent whitening agent, which expands the application range of fluorescent whitening agents, but because the cationic group in the product directly interacts with the fluorescent group Connected, so that its ultraviolet absorption performance and fluorescence emission performance become smaller, and the fluorescence quantum yield decreases

Method used

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  • Amphoteric fluorescent whitening agent and preparation method thereof
  • Amphoteric fluorescent whitening agent and preparation method thereof
  • Amphoteric fluorescent whitening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0032] Embodiment 1: the optical brightener synthesized by the present embodiment, its structural formula is:

[0033]

[0034] Synthesize the fluorescent whitening agent of above formula structure, its concrete steps are:

[0035] 1) First, add equimolar cyanuric acetone dispersion and DSD acid into a three-necked flask to carry out one-step condensation under the conditions of 0-5°C and pH4-6 until the pH value does not drop anymore, and then raise the temperature to 35 ~55°C, adjust the pH to 5~7, add aniline with equimolar amount of cyanuric chloride for two-step condensation, and finally raise the temperature to 85~95°C, adjust the pH to 7~8, add cyanuric chloride, etc. Molar amount of NaSH carries out three-step condensation, and acetone is distilled out simultaneously;

[0036] 2) Next, drop the temperature to 30-50°C, add dropwise 3-chloro-2-hydroxypropyltrimethylammonium chloride (CTA) solution of 2 times the molar amount of cyanuric chloride to the reaction system,...

Embodiment 2

[0038] Embodiment 2: the optical brightener synthesized by the present embodiment, its structural formula is:

[0039]

[0040] Synthesize the fluorescent whitening agent of above formula structure, its concrete steps are:

[0041] 1) First, add equimolar cyanuric acetone dispersion and DSD acid into a three-necked flask to carry out one-step condensation under the conditions of 0-5°C and pH4-6 until the pH value does not drop anymore, and then raise the temperature to 35 ~55°C, adjust the pH to 5~7, add aniline with equimolar amount of cyanuric chloride for two-step condensation, and finally raise the temperature to 85~95°C, adjust the pH to 7~8, add cyanuric chloride, etc. The molar amount of ethanolamine carries out three-step condensation, and acetone is distilled out simultaneously;

[0042] 2) Next, drop the temperature to 30-50°C, and add dropwise 3-chloro-2-hydroxypropyltrimethylammonium chloride (CTA) alkaline solution of 2 times the molar amount of cyanuric chlor...

Embodiment 3

[0044] Embodiment 3: the optical brightener synthesized by the present embodiment, its structural formula is:

[0045]

[0046] Synthesize the fluorescent whitening agent of above formula structure, its concrete steps are:

[0047] 1) Add an equimolar acetone dispersion of cyanuric chloride and methanol to a three-necked flask and carry out one-step condensation at a temperature of 0 to 5°C and a pH of 4 to 6 until the pH value no longer drops, and then raise the temperature to 35 to 40 ℃, when the pH is adjusted to 6-7, add ANSD acid with an equimolar amount of cyanuric chloride for two-step condensation, then raise the temperature to 85-95°C, and when the pH is adjusted to 6-7, add cyanuric chloride, etc. The molar amount of ethanolamine carries out three-step condensation while steaming out acetone to obtain the intermediate product I;

[0048] 2) Fe powder with 4 times the molar weight of cyanuric chloride and ammonium chloride with 0.8 times the molar weight of cyanur...

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PUM

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Abstract

The invention relates to an amphiprotic fluorescent whitener and and method for making same, comprising, firstly, further condensing cyanuric chloride with DSD acid, adding hydroxy or sulfhydryl compounds for secondary condensation, adding amino compound for third condensation, dropping alkaline solution of cation etherifying agent to the reaction system, and cationizing the condensation product in the third step; and, at last, the fluorescent whitener is obtained by filtrating and recrystallizing to purify and refine the product. The method for preparing cation etherifying agent amphiprotic fluorescent whitener has a simple process and causes small environment pollution. Compared with ordinary fluorescent whitener, the amphiprotic fluorescent whitener synthesized in the invention can sufficiently enhance the visual whiteness of the whitened material, and sufficiently extends the range of application of pH value.

Description

technical field [0001] The invention relates to a fluorescent whitening agent and a preparation method thereof, in particular to an amphoteric fluorescent whitening agent and a preparation method thereof. Background technique [0002] The definition of fluorescent whitening agent in the national standard GB / T6687-1986: fluorescent whitening agent is a colorless fluorescent dye, which can excite blue and purple light and yellow light on the substrate under the irradiation of ultraviolet light. Complementary and brightening effect. [0003] The whitening of fluorescent whitening agent is a kind of optical complementary color effect. The white or light-colored substrate treated by it can be whitened, brightened or brightened, so fluorescent whitening agent is also called optical brightener. It is called glazing agent, brightener, white fluorescent dye, etc. [0004] 4,4'-diaminostilbene-2,2'-disulfonic acid is usually called DSD acid, it is an important industrial raw materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/52C07D251/54C11D3/42D06L3/12D21H21/30D06L4/60
Inventor 张光华解攀刘静刘国俊朱军峰
Owner SHAANXI UNIV OF SCI & TECH
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