水性聚氨酯性能对柔性链段结构的依赖性及对纸张的增强作用  

The Dependence of Waterborne Polyurethane Performance on the Structure of the Flexible Chain and Its Application in Paper Strengthening

作　　者：费贵强 朱科[1] 王海花[1] 李菁熠[1] 税小军[1] 

机构地区：[1]教育部轻化工助剂化学与技术重点实验室陕西科技大学化学化工学院,陕西西安710021

出　　处：《造纸科学与技术》2013年第3期47-51,69,共6页Paper Science & Technology

基　　金：国家自然科学基金(21204046);教育部留学回国人员科研启动基金资助项目;陕西省青年基金(2010JQ6012);陕西省教育厅专项(2010JQ440);陕西科技大学学科人才培养资助项目(XSG2010011)

摘　　要：以聚四氢呋喃二元醇(PTMG,Mn=1000)、聚己内酯二元醇(PCL,Mn=1000)作为柔性链段制备得到了一系列不同柔性链段的水性聚氨酯纸张表面施胶液,通过傅里叶红外(IR)、原子力显微镜(AFM)和Zeta粒径分析等方法研究了聚合物的物性关系;并讨论了不同n(NCO)/n(OH)(R值)比值条件下,PTMG型施胶液与PCL型施胶液对于纸张耐折度和湿强度的影响。结果表明:当n(NCO)/n(OH)=1.2～2.0,w(DMPA)=9.25%时,乳液粒径在30～100nm之间,乳液透明稳定;AFM表明PTMG型涂膜表面粗糙度低;应力应变结果说明PCL型涂膜力学性能及耐水性更佳;PCL型聚氨酯施胶液对纸张耐折度和湿强度的提高明显优于PTMG型聚氨酯施胶液;对于PCL型施胶液,R=1.8时纸张耐折度达到1075次,R=2.0时湿强度为33.78%。A series of paper surface sizing agent of waterborne polyurethane which have different flexible segment were successfully prepared by using polytetrahydrofuran（PTMG1000） and polycaprolactone diols （PCL1Q00） , Fou rier Transform Infared Spectrometer （FTIR） , Atomic Force Microscope（AFM） and Dynamic Light Scattering In strument（DLS） were used to characterize the structure of the polymer： effects of n （NCO）/n （OH）（ R value） on PTMGtype sizing material and PCLtype sizing material for paper folding endurance and wet strength were systemat ically studied . The results showed that the emulsions were stable and transparent and the emulsion particle size ranged from 30nm to 100 nm. AFM indicated that the PTMG type had low roughness coating surface. Stressstrain concluded that the films displayed better water resistance and mechanical property for PCL type when n （NCO）/n （OH） = 1.2 2.0 , w（DMPA） = 9.25 %. The PC1 type polyurethane sizing agent for improving paper folding en durance and wet strength was better than PTMG type polyurethane sizing agent. For PC1 type sizing agent, when R = 1.8 the folding endurance reached 1075 times, when R = 2.0. the wet strength increased to 33.78%

关 键 词：水性聚氨酯 表面施胶 柔性链段 纸张 

分 类 号：TQ727.5[化学工程]