芳纶纤维表面改性及其对芳纶/橡胶复合材料黏合性能的影响

摘要

以原位乳液聚合方法合成水性聚氨酯预聚体(WPUP)包覆纳米ZnO粒子(ZnO@WPUP),将KOH 预处理后的芳纶纤维浸渍在改性ZnO乳液中进行二次处理,进一步与天然橡胶硫化,得到ZnO@WPUP 改性芳纶/橡胶复合材料,并通过 FTIR、SEM和 H 抽出实验等测试分析ZnO@WPUP对芳纶/橡胶复合材料黏合性能的影响.结果表明:WPUP能有效提高ZnO分散性,随着 WPUP含量增加,ZnO@WPUP 在芳纶纤维表面分散更加均匀,纤维表面粗糙度增大,改善了芳纶纤维表面橡胶的黏附量,从而大幅度提高芳纶/橡胶复合材料的黏结强度.%The waterborne polyurethane prepolymer(WPUP)encapsulated ZnO particles(ZnO@WPUP)were synthesized by using in-situ emulsion polymerization method.The aramid fibers pretreated by KOH were then sec-ondly treated by modified ZnO emulsion.In addition,aramid/rubber composites modified by ZnO@WPUP were ob-tained by the vulcanization between aramid fiber and nature rubber.Meanwhile,the influence of ZnO@WPUP on the adhesion property of aramid/rubber composites was analyzed by FTIR,SEM and cord-H-pull test.The results show that WPUP can effectively enhance the dispersing property of ZnO.The roughness and dispersing property of ZnO@WPUP on the surface of aramid fibers increase obviously as the content of WPUP increasing.Thereby the modified ZnO can effectively improve the amount of adhesive rubber on the aramid fibers surface,and the adhesion strength of aramid/rubber composites is enhanced significantly.