荧光水性聚氨酯纸张表面施胶剂的制备及应用

以自制5，7-二羟基-4-甲基香豆素（DHMC）为水性聚氨酯荧光增白改性剂，制备了一系列荧光水性聚氨酯（FWPU）乳液，采用FTIR、¹H NMR、DLS和荧光光谱等对荧光水性聚氨酯进行了结构表征和性能测试。将制备得到的荧光水性聚氨酯应用于纸张表面施胶，研究探讨了荧光水性聚氨酯乳液对纸张表面施胶性能的影响。FTIR、¹H NMR分析表明，DHMC已被引入到FWPU分子链中；当w（DHMC）=0.6%时，FWPU乳液粒径为86.17 nm，荧光强度最强为40220.44 a.u.（1 a.u.=27.2114 eV）。FWPU乳液具有良好的纸张表面施胶性能，纸张施胶度51.92 s，白度77.93%。

Preparation and properties of fluorescent waterborne polyurethane as paper sizing agent

A series of fluorescent waterborne polyurethane (FWPU) dispersion had been successfully prepared by importing the fluorescent whitening modifier 5,7-dihydroxy-4-methylcoumarin (DHMC). The structure and properties of FWPU were characterized by FTIR, ¹H NMR, DLS, fluorescence spectra, the degree of sizing, whiteness and SEM. The surface sizing properties of FWPU emulsion were studied. FTIR and ¹H NMR analysis showed that DHMC had been introduced into the molecular chain of FWPU. When w (DHMC)=0.6%, the particle size of FWPU emulsion was 86.17 nm, the fluorescence effect was 40220.44 a.u.(1a.u.=27.2114 eV). The results showed that the FWPU emulsion had an excellent paper sizing property. Paper sizing value could reach 51.92 s, the whiteness was 77.93%.