釜内合金型和共混型热塑性聚烯烃热稳定性的流变学研究  

Study on the Thermal Oxidation of In-reactor Polypropylene Alloy and Physical Blending Polypropylene Alloy by a Rheological Method

作　　者：梁卫业 吴力立[1] 谭宁[2] 陈楠 刘志维[2] 熊玉钦[2] LIANG Wei-ye;WU Li-li;TAN Ning;CHEN Nan;LIU Zhi-wei;XIONG Yu-qin(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Special Functional Waterproof Materials,Beijing Oriental Yuhong Waterproof Technology Co.,Ltd.,Beijing 101309,China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]北京东方雨虹防水技术股份有限公司特种功能防水材料国家重点实验室,北京101309

出　　处：《塑料工业》2019年第4期83-87,92,共6页China Plastics Industry

摘　　要：利用丙烯基弹性体(PBE)和乙烯基弹性体(POE)分别对NAX-9釜内合金型热塑性聚烯烃(TPO)进行共混改性,当PBE或POE质量分数为50%时,通过动态热机械分析(DMA)得到的储能模量与巴塞尔釜内合金工艺制备的TPO CA10A相近。采用流变学方法,通过动态时间扫描研究CA10A、NAX-9/PBE和NAX-9/POE共混型TPO的热稳定性。结果表明,CA10A和NAX-9/PBE共混型TPO发生热氧老化时,容易形成β-断链反应,导致其黏度随扫描时间的延长而逐步降低;而NAX-9/POE共混型TPO发生热氧老化时,容易形成交联反应,导致其黏度随扫描时间的延长而逐步增大。在不添加抗氧剂的NAX-9/PBE共混型TPO中,PBE含量越高,黏度随时间下降的趋势越明显。CA10A和NAX-9/PBE共混型TPO中的橡胶相和均聚聚丙烯相的相容性比较好,使得抗氧剂在基体中的分散均匀性要高,因此CA10A和NAX-9/PBE共混型TPO的热氧稳定性要好,其中CA10A的热稳定性能最佳。Two kinds of physical blending thermoplastic polyolefin( TPO) were obtained by mixing NAX-9 with propylene based elastomer( PBE) and ethylene based elastomer( POE),respectively. When the weight fraction of PBE or POE was 50%,the storage modulus of the blends observed from DMA was close to in-reactor TPO CA10 A from catalloy process of Basel. The thermal stability of the CA10 A and NAX-9/PBE and NAX-9/POE were studied by dynamic time scanning with the method of rheology. The results show when CA10 and NAX-9/PBE mixed TPO occur thermal-oxidization aging,the β-chain scission reaction could be formed to decrease the viscosity with the increase of scanning time. When NAX-9/PBE mixed TPO occur thermal-oxidization aging,the cross-linking reaction could be formed to increase the viscosity with the increase of scanning time. In the NAX-9/PBE mixed TPO without antioxidant compound,the viscosity could decrease obviously with the increase of PBE contents. The rubber phase in CA10 A and NAX-9/PBE mixed TPO has good compatibility with the homo-polypropylene phase, which shows the dispersion uniformity of the antioxidant in the matrix is higher. Therefore,both CA10 A and NAX-9/PBE mixed TPO blends show better thermal stability,and CA10 A is the best.

关 键 词：釜内合金型热塑性聚烯烃 共混型热塑性聚烯烃 热氧老化 动态流变行为 

分 类 号：TQ334[化学工程—橡胶工业]