欢迎来到天天文库
浏览记录
ID:32466824
大小:2.70 MB
页数:77页
时间:2019-02-06
《聚丙烯纤维的力学性能和耐老化性能的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文应用Instronll22强力仪、声速仪、x一射线衍射仪、热分析仪、扫描电镜、红外光谱等仪器研究了聚丙烯纤维的强度和耐老化性能及老化机理。研究了四种具有不同熔融指数的聚丙烯切片的结晶性能和熔体流动性能,对比了四种切片的可纺性,选出适合制备高强聚丙烯纤维的切片。并通过对纤维制餐工艺的研究,探讨了高强聚丙烯纤维的最佳成形条件。选用了EVA和两种纳米Si02作为第二组份,通过共混改性的方法对改善聚丙烯纤维的强度进行研究。选用了受阻胺光稳定剂Tinuvinlll和抗氧剂1010进行聚丙烯纤维的耐光老化性能研究;并通过试
2、样的紫外加速老化、自然老化、热氧老化及热氧稳定性等实验和老化前后试样结构、力学性能的研究,探讨了聚丙烯纤维的老化机理。实验结果表明:原料、改性组分、纤维制备工艺对纤维的强度均有很大的影响,建立产生低取向、低结晶度的次晶结构的初生纤维的纺丝条件是制备高强聚丙烯纤维的必要条件。在本研究范围内,添加适宜的EVA和纳米Si02都能提高聚丙烯纤维的强度;添加光稳定剂和抗氧剂对聚丙烯纤维的耐光老化性能有较大程度的提高;添加纳米SiO,对聚丙烯纤维的热氧稳定性影响较小;使聚丙烯纤维老化的主要因素依次为紫外光、氧、热,聚丙烯纤维老化后
3、的结构变化主要是分子量下降。关键词:聚丙烯纤维强度抗老化自然老化人工加速老化第l页北京jIH皴学院2005川㈣l{pl究乍论文ABSTRACTThemechanicalproperties,ageing—resistantperformanceandagingmechanismofpolypropylenefiberwerestudiedbyInstronll22strengthtester,soundvelocityinstrument,X-raydiffractioninstrument,thermalanalyz
4、er,scanningelectronmicroscopeandinfraredspectruminthestudy.Performancethatcrystallizationperformanceandmeltflowpropertythatwehavestudiedfourkindsofpolypropylenewithdifferentmeltingindex,comparedwiththespinningabilityoffourkindsofsection,electedthesuitablesection
5、whichpreparesthehigh—strengthpolypropylenefiber.Andthroughpreparingtheresearchofthecrafttothefiber,haveprobedintotheconditionoftakingshapeoptimumofthehigh—strengthpolypropylenefiber.WehaveselectedEVAandtwokindsofnano-Si02foruseasthesecondcomponent,studiedtheinte
6、nsityofimprovingpolypropylenefiberthroughmixingthemethodtomodifyaltogether.Tinuvinlllandanti~oxygen1010werechosentoresearchthepolypropylenefiberofagingresistanceproperty.Thepaperstudiestheagingmechanismofthepolypropylenefiberbyacceleratedagingtest,natureagingtes
7、t,thermalagingtestandthermalstabilitytestandresearchofsamplestructureandmechanicalpropertybeforeandafteraging.Theresultsoftheexperimentsshowed:rawmaterials,modifycomponent,spinningtechnicalconditionshadsignificanteffectontenacityofpolypropylenefiber,thenecessary
8、conditionofproducinghightenacitypolypropylenefiberwastoestablishspinningconditionresultinginparacrystallinenascentfibersofloworientation.Withintherangeofthisresearch,
此文档下载收益归作者所有