热塑性交联聚乙烯(TPEXa)管材的制备及性能研究  

Preparation and properties of cross-linked thermoplastic polyethylene (TPEXa) pipes

作　　者：段凯歌 朱辉 倪佳 泮豪 周朝锡 陈小蝶 梅振威 于东明 DUAN Kaige;ZHU Hui;NI Jia;PAN Hao;ZHOU Chaoxi;CHEN Xiaodie;MEI Zhenwei;YU Dongming(Polymer Lab,Zhejiang Menred Comfort System Co,Ltd,Wenzhou 325000,China)

机构地区：[1]浙江曼瑞德舒适系统有限公司聚合物实验室,浙江温州325000

出　　处：《中国塑料》2023年第1期8-12,共5页China Plastics

摘　　要：选取耐热聚乙烯(PERT)进行微交联改性制备出一种热塑性交联聚乙烯(TPEXa)管材,使其在保留PERT管热塑性的基础上提高耐热性和抗蠕变性,研究了交联剂含量对TPEXa材料熔体质量流动速率和交联度的影响,并对TPEXa管材的静液压性能、热熔回收性能及回收料的力学性能进行了测试。结果表明,当交联剂的含量为0.08%时,TPEXa材料的熔体质量流动速率为5.6 g/10 min(190℃,21.6 kg),交联度为2.3%,负荷变形温度可以达到78℃(Tf0.45),耐温性能较好。制备的管材可以通过95℃下22 h、165 h和1 000 h静液压测试,测试所用环应力超过PERT II管接近PEX管材环应力的规定,具有较好的耐温性能和抗蠕变性能,并且可以进行热熔回收,回收料具有较好的力学性能。Polyethylene with raised temperature resistance(PERT) was modified through micro-crosslinking to obtain a new type of cross-linked thermoplastic polyethylene(TPEXa) pipes. The resultant PERT pipe not only retained good thermoplasticity but also obtained an improvement in heat resistance and creep resistance due to partial crosslinking in the PEX pipes. The influence of the content of crosslinking agent on the melt mass-flow rate and crosslinking degree of TPEXa material was investigated, and the hydrostatic properties, hot melt recovery performance, and mechanical properties of the recycled TPEXa pipe material were characterized. The results indicated that the TPEXa material obtained a melt mass-flow rate of 5. 6 g/10 min(190 oC, 21. 6 kg), a crosslinking degree of 2. 3 %, and a heat deformation temperature of 78 oC(Tf0. 45) at a crosslinking agent content of 0. 08 wt%. The prepared pipe passed 22 h, 165 h and 1000 h hydrostatic tests at 95 oC. The ring stress applied in the tests exceeded the requirements of the ring stress of PERT II pipe and was close to the ring stress of PEX pipes. The TPEXa material exhibits good temperature resistance and creep resistance. This material can be melted and recycled, and the recycled material presents good mechanical properties.

关 键 词：热塑性交联聚乙烯管材 热塑性 耐热性 抗蠕变性 力学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]