共查询到18条相似文献,搜索用时 93 毫秒
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为获得性能良好的橡胶动密封件,本文运用机械共混法制备三元乙丙橡胶(%20EPDM),研究过氧化二异丙苯(DCP)用量对EPDM橡胶的硫化时间、硬度、拉伸性能及润湿性能的影响。结果表明,随着DCP用量增加,EPDM橡胶硫化时间呈减小趋势。EPDM橡胶的硬度、抗拉强度、断裂强度以及润湿角随DCP用量的增加均呈先上升后下降的趋势。在DCP用量为3phr时,EPDM橡胶的%20综合力学性能最好,与水的亲和能力最弱。 相似文献
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以双叔丁基过氧化异丙基苯为硫化剂,通过无转子硫化仪、毛细管流变仪及橡胶加工分析仪考察了炭黑用量对乙烯含量不同的2种三元乙丙橡胶(EPDM)混炼胶硫化特性、流变行为、动态黏弹性能及硫化胶拉伸性能的影响。结果表明,随着炭黑用量的增加,2种EPDM混炼胶的焦烧时间(ts1)均缩短,正硫化时间均变化不大,门尼黏度均逐渐增大,混炼胶黏-切依赖性增大; 在相同炭黑用量下,乙烯含量高的混炼胶的ts1较短,硫化程度和硫化速率提高,2种EPDM混炼胶均表现出剪切变稀行为,乙烯含量高的EPDM混炼胶的剪切弹性模量明显高于乙烯含量低的EPDM混炼胶; 随着炭黑用量的增加,2种EPDM硫化胶的拉伸强度和100%定伸应力均不断提高,且高乙烯含量有助于提高EPDM硫化胶的拉伸性能。 相似文献
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《Polymer-Plastics Technology and Engineering》2013,52(7):1217-1234
ABSTRACT This paper discusses some properties of the polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) blends, such as tensile properties, heat resistance, gel content, and morphology. Dicumyl peroxide (DCP) and N,N-m-phenylene bismaleimide (HVA-2) and their combination were applied in PP/EPDM/NR blends as cross-link agents. In terms of tensile properties, the combination of DCP with HVA-2 shows the highest tensile strength and elongation at break in all PP/EPDM/NR blend ratios compared to similar blends, except with DCP or HVA-2 alone. The addition of HVA-2 produced blends with good heat resistance, while the combination of DCP with HVA-2 shows the highest gel content dealing with the cross-links formation. SEM micrographs from the surfaces extraction of the blends support that the cross-links have occurred during dynamic vulcanization process. 相似文献
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研究了硫黄硫化体系和过氧化物体系对燕化中试产品三元乙丙橡胶(EPDM)性能的影响。实验结果表明,硫黄硫化体系中硫黄用量为1.5份时胶料物理机械性能最好;硫黄用量为2份时,胶料耐热老化性能最好。硫黄硫化体系中,二硫化四基秋兰姆(TMTDM)、2硫醇基苯并噻唑(M)和N-环己基-2-苯并噻唑次磺酸胺(CZ)3种促进剂并用时协同作用较好,胶料硫化速度最快,力学性能最好;促进剂TMTD用量为1.5份时,胶料压缩永久变形最小,耐热性能最好。过氧化物硫化体系中,当DCP用量由2份增加至5份时,胶料硫化速度提高,力学性能下降,压缩永久变形性能有一定改善。三烯丙基异氰脲酸酯(TAIC)用量为5份时,胶料压缩永久变形最小,耐热氧老化性能最好。 相似文献
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《国际聚合物材料杂志》2012,61(12):1169-1183
ABSTRACT This article discusses some properties such as tensile properties, chemical and oil resistance, gel content, crystallinity, and morphology of polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) blends. Dicumyl peroxide (DCP) was applied as a crosslinking agent. In terms of tensile properties, peroxide vulcanized blend shows higher tensile strength and tensile modulus (stress at 100% elongation, M100) as compared with the unvulcanized blend. The elongation at break of the peroxide vulcanized blend is higher for the blend with NR rich content compared with the EPDM rich content. The improvements in chemical and oil resistance as well as gel content of peroxide vulcanized blends have also proved the formation of crosslinks in the rubber phase. Scanning electron microscopy (SEM) micrographs from the surface extraction of the blends support that the crosslinks have occurred during dynamic vulcanization. Dynamical vulcanization with DCP has decreased the percent crystallinity of blends that can be attributed to the formation of crosslinks in the rubber. 相似文献
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开发了辐射硫化低损耗耐高电压乙丙橡胶绝缘料。试验发现:辐射硫化的敏化剂宜选择三(甲基丙烯酸三羟甲基)丙烷酯,用量为15~25(质量份);增塑剂宜采用超低门尼粘度的EPDMKeltan1446A与微晶石蜡并用,绝缘橡胶的性能符合IEC502-1994的要求 相似文献
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采用电子拉力试验机、氧指数仪、MDR2000硫化仪等设备研究了无机镁质阻燃剂LH3、氢氧化镁和氢氧化铝对乙丙橡胶性能影响,并对LH3与红磷协同阻燃效应进行了表征。研究发现,与氢氧化镁和氢氧化铝相比,填充LH3的乙丙橡胶的焦烧时间及正硫化时间要比氢氧化镁及氢氧化铝的短,硬度比氢氧化镁及氢氧化铝的都要低,伸长率要大于氢氧化镁及氢氧化铝的;拉伸强度介于氢氧化镁及氢氧化铝之间;硫化曲线最小扭矩比氢氧化镁及氢氧化铝的小,压延外观也较光滑。LH3填充的乙丙胶的氧指数介于氢氧化镁及氢氧化铝之间。LH3与红磷有显著的协同阻燃效应。 相似文献