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Research on the Synthesis and Properties of Fluorescent Whitening Agents Containing P-Aromatic Amino

Author: YangXiaoYu
Tutor: CaoChengBo
School: Shandong University
Course: Chemical processes
Keywords: Fluorescent brighteners P-aminobenzoate Anionic Quaternary Ammonium Reaction mixed
CLC: TQ610.495
Type: Master's thesis
Year: 2010
Downloads: 113
Quote: 0
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Abstract

Triazinylamino-stilbene fluorescent brighteners are widely used because of its higher cost textile printing and dyeing, synthetic fibers, plastics, paper, synthetic detergents and other fields, the typical varieties VBL, BBU and CXT. Domestic fluorescent brighteners such research emphasis on process improvement and industrial production, the development of a single product structure, poor quality, high-end product less and less competitive in the market. A problem for domestic fluorescent brighteners products using three-step condensation process, changing the substituents on the triazine ring, i.e. cyanuric chloride first step condensation of the amino benzoic acid, and then with the DSD acid two-step condensation , and finally with the amine compound of the low-cost three-step condensation, synthesis of the eight kinds of novel anionic FWA, to study the photophysical and chemical properties in the aqueous solution, the results show that: most of the newly synthesized product ultraviolet absorbent, fluorescence emission integrated intensity and fluorescence quantum yield and excellent performance. Photoisomerization phenomenon, but there are also to be stored in the dark. Easily condensate precipitated disadvantage for the Poor traditional FWA acid resistance, under acidic conditions, synthesized by a tertiary amine-based compound was added in the third step of the condensation of four novel amphoteric FWA its structural characterization, and conventional anionic fluorescent whitening agent compared to its fluorescence emission performance and dyeing properties. The results show that: the amphoteric fluorescent brighteners fluorescence quantum yield is lower, the fluorescence emission performance is weak, but such fluorescent brighteners are more suitable for use in strong acidic conditions. Synergistic is the the fluorescent brightener research focus and emphasis, some foreign companies have developed successful mixed and put into production, while domestic research less. In this paper, on the basis of the group on the reaction complex prepared two series of the product of the new complex type of fluorescent brighteners, One is in step condensation adding two aromatic amine molar ratio of 1:1; Second in a three-step condensation proportionally adding two amines prepared 10 kinds of the reaction mixed product contains two symmetrical fluorescent brighteners and an asymmetric fluorescent brighteners explore substituent different FWA nature of impact, and its UV absorption and fluorescence emission with anionic FWA Comparative Study and dyeing application performance, discussed the effects of reaction complex paired fluorescent brighteners optical performance. The test results show that: the reaction product as a complex type having a relatively high UV absorption properties and fluorescence emission properties, but its poor lightfastness properties, mainly due to the presence of the poor lightfastness properties asymmetric type compound is one.

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CLC: > Industrial Technology > Chemical Industry > Dyes and intermediates industry > General issues > Raw materials and auxiliary materials > Optical brighteners
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