硅烷偶联剂对芳纶的优化改性

Study on modified aramid with silane coupling agent

采用硅烷偶联剂KH-550对芳纶进行表面处理。通过单因素法分析硅烷偶联剂KH-550在不同处理条件(浓度、温度和时间)下芳纶的断裂强力和界面剪切强度;再通过正交实验法得到硅烷偶联剂KH-550改性芳纶的最佳方案。结果表明,硅烷偶联剂KH-550表面处理芳纶的最优工艺为:浓度20%,温度55℃,时间7 h;得到芳纶的界面剪切强度增加率远远高于断裂强力损失率,芳纶的断裂强力损失率为7.79%,界面剪切强度增加率为14.59%,有利于纤维与树脂界面的结合。

The surface treatment of the aramid was carried out using the silane coupling agent KH-550. The breaking strength and interfacial shear strength of aramid coupling agent KH-550 under different treatment conditions（concentration, temperature and time） were analyzed by single factor method.The results show that the optimum process of surface treatment of aramid with silane coupling agent KH-550 is 20%, the temperature is 55 ℃ and the time is 7 h. The rate of increase of shear strength of aramid interface is much higher than that of fracture strength, the loss rate of breakage of aramid is 7.79%, and the increase rate of interfacial shear strength is 14.59%, which is beneficial to the combination of fiber and resin interface.