丙烯酸/丙烯酸丁酯共聚物用作弹性皮革复鞣剂的研究

以丙烯酸(AA)、丙烯酸丁酯(BA)为共聚单体,经自由基聚合制备了聚丙烯酸/丙烯酸丁酯共聚物,并将共聚物应用于蓝湿革的复鞣。通过单因素实验筛选了BA的用量及引发剂的用量;采用X射线衍射仪、旋转黏度计对不同引发剂用量的共聚物的结晶度、黏度进行了考察;采用红外光谱仪、热分析仪对优化条件下制备的共聚物的结构进行了表征;通过正交实验优化了共聚物用于蓝湿革复鞣的工艺条件;将共聚物与铬粉、RST复鞣剂进行了复鞣应用对比,并对革样进行了扫描电镜观察。结果表明:BA用量为单体总物质的量的2%,引发剂用量为单体总质量的10%时,制备的共聚物应用效果最好;引发剂用量越大共聚物黏度越小,共聚物结晶度越大;优化条件下制备的共聚物为AA、BA两种单体的共聚物;共聚物用作蓝湿革复鞣的最佳应用条件为共聚物用量为蓝湿革质量的1.5%,处理时间30 m in,复鞣温度30℃,m(水)∶m(蓝湿革)=1∶1;AA/BA共聚物与铬粉、RST复鞣剂复鞣革样的杨氏模量相当,AA/BA共聚物对纤维分散作用明显。

The Copolymer of Acrylic Acid/Butyl Acrylate Used as Retanning Agent for Elastic Leather

The copolymer of acrylic acid(AA)/butyl acrylate(BA) was synthesized by free radical polymerization and applied in leather retanning.The best application result occurred when the dosage of BA and initiator were 2% and 10% respectively.The higher dosage of initiator,the higher crystallinity the copolymer had,while the viscosity was lower.FTIR and DSC analysis showed the polymer was a coplymer of two monomers AA and BA,and its best application dosage,time,liquid ratio and temperature were respectively 1.5%,30 min,1∶1 and 30 ℃.Comparison with two other retanning agents revealed that the copolymer had a similar effect in leather elasticity.TEM showed the fiber bundles processed by the copolymer was dispersed sufficiently.