蚕丝的丙烯酸六氟丁酯接枝改性及拒水性能

Preparation of water-repellent silk by graft modification with hexafluorobutyl acrylate

采用含氟单体丙烯酸六氟丁酯,在引发剂过硫酸钾作用下对蚕丝进行接枝改性,研究单体和引发剂用量、改性温度和时间以及改性pH值等对蚕丝接枝率的影响。采用扫描电镜(SEM)和X射线光电子能谱(XPS)对接枝改性的蚕丝进行表征,并测试整理后蚕丝织物的物理机械性能及拒水性。结果表明,丙烯酸六氟丁酯对蚕丝接枝的优化工艺参数为:单体质量分数150%(omf),引发剂质量分数1%(owm),pH值3,反应时间120 min、反应温度75℃。接枝改性对蚕丝织物的白度、黄度、断裂强力和透气性影响较小,而表面张力下降明显,拒水性明显提高。

Silk fabric is grafted with fluoride monomer of hexafluorobutyl acrylate in the presence of potassium persulfate as the initiator. The effects of monomer and initiator concentrations, grafting temperature and time, pH value on grafting yield of the silk are studied. The SEM and XPS give evidence of the grafting reaction between hexafluorobutyl acrylate and silk fiber. Also, the physico-mechanical properties and water repellency of the grafted silk are measured. The results show that the optimum process condition of grafting is hexafluorobutyl acrylate 150% （omf）, initiator 1% （omm）, pH value 3, reacting at 75 ~C for 120 min. The modification has little effect on the whiteness, tensile strength and air permeability of the grafted silk fabric, while the surface tension declines and the water repellency increases obviously, compared with those of the ungrafted silk fabric.