【作者】 刘新民；

【导师】 陈国华； 潘炯玺；

【作者基本信息】 中国海洋大学 ， 环境科学， 2003， 硕士

【摘要】 本文通过硅烷交联和过氧化物交联两种方法实验研究了交联聚乙烯。研究了交联剂对硅烷交联聚乙烯拉伸强度、断裂伸长率及凝胶含量的影响，并比较了不同的硅烷对交联反应的影响。讨论了催化剂、抗氧剂、引发剂对硅烷交联聚乙烯性能的影响，对比了不同催化剂、不同水温对硅烷交联反应速率的影响。对不同交联剂的聚乙烯交联体系进行了对比分析。同时运用HAAKE流变仪对交联聚乙烯的流变性能进行了研究。采用了多种聚乙烯共混技术获得了一种流动性相对较好的共混基料，在此基础上又加入了流变剂进一步改善其流动性。通过大量的流变实验得到了较为满意的结果。介绍了过氧化物交联聚乙烯的工艺、材料用量对交联料性能的影响，探讨了温度对凝胶含量的影响、过氧化物用量对材料力学性能及交联度的影响，以及交联度与材料力学性能的关系，阐述了过氧化物交联反应机理。还对交联聚乙烯的耐油性能、应变应力曲线、硅烷交联反应动力学等进行了讨论，并通过电镜考查了PEX的微观形态。最后在小试的基础上进行了中试和工业化实验，取得了较好的结果，产品的各项性能均达到了国外同类产品的性能指标。并批量生产了硅烷交联聚乙烯材料供给了多家生产企业，生产出的管材拿到国家化学建材测试中心进行测试，各项指标都达到了美国ASTM标准。更多还原

【Abstract】 In this paper crosslinkable PE is studied by silane crosslinking and peroxide crosslinking . Effects of silane on gel fraction are discussed. And effects of different types silane on crosslinking reaction are compared. Effects of catalyst> antioxdantN evocator on properties of PEX are compared. At the same time the flow behaviour of graft PE is studied by HAAKE rheoriscometer and reaction mechanism of grefting and crosslink are tested and verified. Then the oil resistance^ the strain/stress curve and the microstate are introduced. The kinetics of grafting and crosslinking are studied. The results show that grafting reaction follow first order kinetics with respect to silane concentration, and crosslinking reactions follow first order kinetics with respect to both catalyst and moisture concentration. The manufacturing technology of peroxide crosslinking PE as well as effects of raw materials and their amount on the compound properties are introduced. And the electric behaviour and ageing property of peroxide crosslinking PE are studied. Lastly, the commercial process of silane crosslinking PE is studied. The suitable process and formula are found. PEX has been mass-produced for many factories. The pipe made by the PEX had been tested by the national testing center of chemical buildingmaterials, every behaviour has come up to American standard ASTM. It can replace the imported PEX.更多还原