MH含量对EPDM过氧化物硫化反应的影响

Effect of MH content on the sulfurization reaction of EPDM peroxide

橡胶的共混复合改性和硫化是提升橡胶性能,拓展橡胶应用领域的重要途径。本文通过熔融共混的方法制备了阻燃EPDM复合物,研究了阻燃EPDM复合物中氢氧化镁(MH)含量对三元乙丙橡胶(EPDM)过氧化物硫化反应的影响。结果表明,MH的加入降低了EPDM的焦烧时间t10;在160℃下,硫化速率随着MH的增加逐渐降低;而在170℃和180℃时,随着MH的增加,EPDM的硫化速率先降低后提高。不同硫化温度下EPDM复合物的力学性能测试结果表明,阻燃EPDM复合物硫化后的拉伸强度并没有随着硫化温度的升高而下降,MH对复合物中EPDM硫化过程交联结构的形成与稳定具有促进作用。

Blending composite modification and vulcanization of rubber are important ways to improve rubber properties and expand rubber application fields.In this paper,flame retardant EPDM composites were prepared by melt blending,and the effect of Magnesium hydroxide(MH)content in flame retardant EPDM composites on peroxide vulcanization of EPDM rubber(EPDM)was studied.The results showed that the addition of MH reduced the scorching time t10 of EPDM;At 160℃,the vulcanization rate gradually decreases with the increase of MH;At 170℃and 180℃,with the increase of MH,the vulcanization rate of EPDM first decreases and then increases.The mechanical properties test results of EPDM composites at different vulcanization temperatures show that the tensile strength of flame-retardant EPDM composites after vulcanization does not decrease with the increase of vulcanization temperature.MH has a promoting effect on the formation and stability of cross-linked structure during the vulcanization process of EPDM in the composites.