PP/PLA/ATP-KH570复合纤维的制备及性能

Preparation and properties of PP/PLA/ATP-KH570 ternary composite fibers

采用硅烷偶联剂KH570对凹凸棒土(ATP)进行表面化学改性得到KH570接枝ATP(ATP-KH570),以甲基丙烯酸羟乙酯(HEMA)为增容剂,与聚丙烯(PP)/聚乳酸(PLA)经熔融共混挤出制备PP/PLA/ATP-KH570共混物并进行熔融纺丝。采用差示扫描量热法、热重分析等对复合纤维进行表征,考察了ATP-KH570含量对复合纤维力学性能、热稳定性、熔融和降解行为的影响,并评估了复合纤维丝束滤嘴对不同蒸汽和烟气的吸附过滤性能。结果表明:ATP-KH570结合HEMA能有效提升体系的相容性,随ATP-KH570含量增大,复合纤维力学性能先增大后降低,热稳定性得到提升,PLA冷结晶受限,降解速率减小,丝束滤嘴对烟气的过滤性能逐渐提高,对极性和非极性气体的吸附率明显高于纯PP,但吸阻逐渐增大。

Attapulgite(ATP)was chemically modified by silane coupling agent KH570 to prepare KH570 grafted ATP(ATP-KH570),which was melt and blended with polypropylene(PP)and polylactide(PLA)to prepare PP/PLA/ATP ternary blends with hydroxyethyl methacrylate(HEMA)as the compatibilizer.The blends were then meltspinned to obtain composite fibers.The composite fibers were characterized by differential scanning calorimetry and thermal gravimetry analyzer.The effects of ATP-KH570 content on mechanical properties,thermal stability,melting and degradation behavior of the composite fibers were investigated,and the adsorption and filtration performance of the composite fiber tow filter on different vapors and tobacco gas were evaluated.The results show that ATP-KH570 combined with HEMA can effectively improve the compatibility of PP/PLA system.The mechanical properties of the composite fibers are first increased and then decreased with the increase of ATP-KH570 content,whose thermal stability is improved;the cold crystallization of PLA is limited,and the degradation rate of the composite fibers is decreased;the fitration performance of the tow filter to tobacco gas is gradually improved and its adsorption ratio of polar and non-polar gases are significantly higher than that of pure PP fiber filter but the adsorption resistance is stronger.