抗紫外水性聚氨酯施胶剂的制备及应用

Preparation and Application of Anti-ultraviolet Waterborne Polyurethane Sizing Agent

关键词:  紫外吸收  改性水性聚氨酯  施胶剂  耐水性  抗老化

Key Words:ultraviolet absorption  modified waterborne polyurethane  sizing agent  water resistance  anti-aging

摘要:以自制2-羟基-4-正辛氧基二苯甲酮（UV-531）为水性聚氨酯抗紫外改性剂，合成了一系列具有紫外吸收特性的水性聚氨酯乳液（UVWPU）。采用核磁氢谱、红外光谱、动态光散射粒径分析、紫外光谱等对改性后的水性聚氨酯进行结构表征和性能测试。将UVWPU应用于纸张表面施胶，探讨了UVWPU对纸张表面施胶性能的影响。核磁氢谱、红外光谱分析表明UV-531已成功制备并引入到UVWPU分子链上；当UV-531用量为2.0%时，UVWPU平均粒径为54.89 nm，紫外吸光度为0.48，与纯水性聚氨酯乳液相比提升了585.7%。当UV-531用量为1.0%时，纸张的抗张指数及耐折度最好，分别为50.7 N·m/g和76次，相比于原纸分别提高67.9%和61次，白度损失降低9.16%。

Abstract:A series of aqueous polyurethane emulsions with UV absorption properties (UVWPU) were successfully prepared by introducing self-made 2-hydroxy-4-octyloxybenzophenone (UV-531) as an anti-UV modifier of aqueous polyurethane. The structure and properties of the modified aqueous polyurethane were characterized by ¹H NMR, FT-IR, DLS, UV-Vis. The UVWPU was applied to the surface of the paper to investigate its surface sizing performance. ¹H NMR and FT-IR analysis showed that UV-531 was successfully introduced into the UVWPU molecular chain. When w (UV-531) = 2.0% (mass fraction), UVWPU particle size was 54.89 nm, UV absorbance was 0.48, increased by 585.7% compared with pure waterborne polyurethane. UVWPU had good surface sizing performance. When w (UV-531) = 1.0% (mass fraction), the maximum tensile index and folding endurance of sized paper could reach 50.7 N·m/g and 76 times respectively, and the whiteness loss could be reduced by 9.16%.