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The Development of New Water-Soluble Fluorescent Brightening Agent

Author: PanLiHua
Tutor: WangShuangFei
School: Guangxi University
Course: Pulp and Paper
Keywords: Liquid fluorescent whitening agent Synthesis Cis-trans isomerization Isosbestic point
CLC: TQ610
Type: Master's thesis
Year: 2006
Downloads: 15
Quote: 0
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Abstract


In this paper, the reaction was sulfanilic nucleophilic weak features, to change the traditional sequence of reactions, the use of cyanuric chloride first with the reaction of amino acid and then condensed with DSD acid synthesis method by single factor and orthogonal experiments to study the optimal synthesis conditions, and to conduct the testing and analysis of indicators; explore the effect of light on the stability of the product; discovered the substance about 305nm an isosbestic point; Finally, the liquid application performance of the fluorescent whitening agent of. The results are as follows: 1. Step condensation of single factor and orthogonal experiment results: analysis by comparing the obtained the synthetic fluorescent brighteners dispersant to ethanol; optimal synthesis conditions: cyanuric chloride: sulfanilic acid (molar ratio) 1:1; reaction temperature ± 0.1 ° C; effect of pH values ??of 7 to 8; reaction time 120min. 2. Two-step the condensed single factor and orthogonal experiment results: the optimal synthesis conditions: the of DSD acid and the theoretical value of the molar ratio of 0.85:1 (1 refers to the first step reaction theoretical value); reaction temperature of 50 0.1 ° C; the pH of the reaction system 8 to 10; reaction time 90min. 3. The three-step condensation single factor and orthogonal experiment results: The optimal synthesis conditions: diethanolamine and the theoretical value of the molar ratio of 1:1 (1 refers to the first, two-step reaction of theoretical value); reaction temperature 95 0.1 ℃; reaction system pH of 8 to 10; reaction time 120min. 4. Product testing results: from the ultraviolet and infrared spectroscopy, the wavelength of maximum absorption of this product 348nm, the maximum emission wavelength of 433nm, the ideal tonal range. 5. Influence of light on the stability of a product: light can promote fluorescent brighteners isomerization of light occurs, so that product is converted to non-fluorescent cis isomer trans isomer with a strong fluorescence. 6. Synthesis found in experiments and other absorption points discoveries: fluorescent brightener has absorption point at the point λ = 305nm absorption point. The particularity of this point can be obtained brighteners with content. 7. Application test validation, better whitening effect of the product: (1) the traditional route to the synthesis of liquid fluorescent whitening agent comparison, the whitening effect of the product is superior to the traditional products; (2) with the VBL solid fluorescent brighteners, under the conditions of the same intensity, the whitening effect of this product is good; (3) can be seen from the scanning electron microscopy, optical brighteners have been combined with the fibers.

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