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A novel waterborne stilbene-based polyurethane fluorescent brightener dispersion WPU-VBL was synthesized by incorporating chemically disodium 4,4’-bis[(4-anilino-6-hydroxyethylamino-1,3,5-triazin-2-yl)amino]stilbene-2,2’-disulphonate(VBL) into the polyurethane chain using isophorone diisocyanate,poly(propylene glycol) and 2,2-dimethylol propionic acid.The structure of WPU-VBL was confirmed by means of Fourier transform infrared spectroscopy.The UV-vis absorption analysis showed a hypsochromic shift of 16 nm when VBL was blocked into polyurethane chain.Number average molecular weight of 2.1×10~4, molecular weight distribution of 2.1 and average latex particle size of about 70 nm for WPU-VBL were determined based on the analysis of gel permeation chromatography and laser particle size analyzer.It was found that the fluorescence intensity of WPU-VBL was prominently enhanced because of the micro-circumstance of VBL and the fluorescence of WPU-VBL was very stable.
A novel waterborne stilbene-based polyurethane fluorescent brightener dispersion WPU-VBL was synthesized by incorporating chemical disodium 4,4’-bis [(4-anilino-6-hydroxyethylamino-1,3,5-triazin-2-yl) -2,2’-disulphonate (VBL) into the polyurethane chain using isophorone diisocyanate, poly (propylene glycol) and 2,2-dimethylol propionic acid. The structure of WPU-VBL was identified by Fourier transform infrared spectroscopy. UV -vis absorption analysis showed a hypochromic shift of 16 nm when VBL was blocked into polyurethane chain. Number average molecular weight of 2.1 × 10 -4, molecular weight distribution of 2.1 and average latex particle size of about 70 nm for WPU-VBL were determined based on the analysis of gel permeation chromatography and laser particle size analyzer. It was found that the fluorescence intensity of WPU-VBL was prominently enhanced because of the micro-circumstance of VBL and the fluorescence of WPU-VBL was very stable.