三元乙丙橡胶绝热层混炼胶贮存老化性能研究

Research on Storage Aging Performance of Rubber Compound of EPDM Insulation Layer

绝热层混炼胶老化性能决定了绝热层使用前的贮存时间,为了掌握绝热层混炼胶贮存时间对绝热层后续使用性能的影响,以控制绝热层混炼胶贮存时间,采用热氧老化试验研究绝热层混炼胶老化不同时间后性能的变化。结果表明,随着老化时间延长,硫化剂(DCP)在高温条件下发生分解、三元乙丙橡胶(EPDM)分子链发生断裂,绝热层力学性能、硫化性能、粘接性能及凝胶分数逐渐降低,其他理化性能无明显变化。由此说明为有效提高绝热层高温贮存有效期,延长使用寿命,应严格关注贮存温度同时远离光照及紫外线照射。

The aging property of the rubber compound of insulation layer determined the storage time before the use of the insulation layer.In order to grasp the influence of the storage time of the rubber compound of insulation layer on the subsequent performance of the insulation layer,the storage time of the rubber compound of insulation layer was controlled.The thermal oxygen aging test was used to study the change of properties of the rubber compound of insulation layer after different aging time.The results show that,with the extension of the aging time,the DCP decomposes and the molecular chain of EPDM breaks at high temperature,the mechanical properties,vulcanization properties,adhesive properties and gel content of the rubber compound of insulation layer decreases,while other physicochemical properties do not change significantly.Therefore,in order to effectively improve the storage period of the insulation layer at high temperature and extend the service life,the strict attention should be paid to storage temperature and keeping away from light and ultraviolet radiation。