共查询到19条相似文献,搜索用时 140 毫秒
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将溶聚丁苯橡胶、乳聚丁苯橡胶、三元乙丙橡胶、顺丁橡胶及低顺式聚丁二烯橡胶分别与天然橡胶并用,研究了各并用胶的加工性能、硫化特性和动静态物理机械性能,重点考察其屈挠疲劳性能,并分析了屈挠裂口的形貌。结果表明,当低顺式聚丁二烯橡胶与天然橡胶并用时,生胶的门尼黏度较大; 硫化胶硬度大,耐磨性、耐老化性及屈挠疲劳性能优异,适用于对屈挠疲劳性能和综合力学性能要求较高的部件。当三元乙丙橡胶与天然橡胶并用时,生胶的门尼黏度较大; 硫化胶硬度大,强度较低,耐磨耗,耐老化,生热高,压缩变形大,屈挠疲劳性能优异,适用于对生热和变形性能要求较低的屈挠部件。 相似文献
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研究了三种不同秋兰姆类促进剂TMTD、DDTS和环保型产品TBzTD在橡胶中的应用,分别对比了等质量和等摩尔量的三种助剂对天然橡胶和三元乙丙橡胶生胶的硫化特性以及对天然橡胶/丁苯橡胶共混胶的硫化特性、力学性能以及老化性能的影响。结果表明,促进剂DDTS可以作为替代促进剂TMTD的过渡产品;等摩尔量的TMTD、TBzTD和DDTS可以达到相近的交联密度;TBzTD和DDTS较TMTD具有更好的加工安全性;DDTS较TBzTD和TMTD具有更好的耐热氧老化性能。 相似文献
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CM与弹性体共混改性的研究概况 总被引:1,自引:0,他引:1
综述了CM与弹性体共混改性领域的研究进展,分别介绍了CM与天然橡胶、丁苯橡胶、丁腈橡胶、三元乙丙橡胶等10余种弹性体的共混研究概况。 相似文献
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为改善三元乙丙橡胶(EPDM)和氯化聚乙烯(CPE)的相容性,提高共硫化反应程度,采用氢化钠(NaH)/马来酸酐(MAH)体系,在橡胶加工设备中对EPDM进行改性反应,得到了改性的三元乙丙橡胶(EPDM-g-MAH)。研究了加入EPDM-g-MAH后EPDM/CPE共混胶的硫化特性、动态力学性能、加工性能和微观相态结构。结果表明,EPDM-g-MAH的加入,使EPDM/CPE共混胶相容性得到明显改善,胶料硫化速度加快,力学性能及动态力学性能得到提高。 相似文献
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制备了高速铁路减振垫板用三元乙丙橡胶(EPDM)/顺丁橡胶(BR)/三元乙丁橡胶(EBDM)复合材料,考察了EPDM生胶种类及三者配比、增塑剂种类及硫化体系对复合材料性能的影响。结果表明,EPDM生胶2502可提高复合材料的耐寒性能。少量BR与EPDM并用可提高复合材料的耐寒性,且BR用量不宜超过10份。EBDM与EPDM和BR并用,复合材料具有优异的耐寒性能,EBDM的用量宜为40~60份。当EPDM、BR与EBDM的质量比为50/10/40时,以己二酸二辛酯为增塑剂,EPDM/BR/EBDM复合材料的玻璃化转变温度为-68.9 ℃,室温损耗因子为0.10,高低温压缩永久变形分别为14%和17%,拉伸强度为16.2 MPa。 相似文献
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The longitudinal ultrasonic velocity, longitudinal ultrasonic absorption (attenuation coefficient), glass‐transition temperature, and Mooney viscosity for epoxidized natural rubber/ethylene–propylene diene monomer blends were measured. The variation of the longitudinal ultrasonic velocity with the blend ratios was linear, indicating a compatible system in comparison with the same system without epoxidation (natural rubber/ethylene–propylene diene monomer), which was incompatible. Also, the behavior was confirmed by heat of mixing calculations as well as Mooney viscosity measurements. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2816–2819, 2002 相似文献
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Hydrogenation is an important method of chemical modification, which improves the physical, chemical, and thermal properties of diene elastomers. It is also a useful method for preparation of polymers with unusual monomer sequences. Natural rubber (NR) could be quantitatively hydrogenated to a strictly alternating ethylene-propylene copolymer using a homogeneous RhCl(PPh3)3 catalyst. The effect of concentration of rubber, catalyst and triphenyl phosphine, temperature, pressure, and solvent on the course of hydrogenation were evaluated. The thermal properties of the hydrogenated NR are compared with NR. © 1997 John Wiley & Sons, Inc. J. Appl Polym Sci 66: 1647–1652, 1997 相似文献
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硅橡胶的物理改性研究进展 总被引:4,自引:1,他引:3
硅橡胶是一类以聚硅氧烷为主链的高分子材料,它具有优异的耐热性、耐寒性和电绝缘性,广泛应用于社会各种行业。但硅橡胶存在分子极性低,疏水性强,物理性能较差等缺陷,其改性研究受到广泛关注。本文主要综述了近年来硅橡胶与氟橡胶(FPM)、三元乙丙橡胶(EPDM)、聚氨酯橡胶(PU)、乙烯乙酸乙烯橡胶(EVM)、乙烯乙酸乙烯酯共聚物(EVA)和乙烯(PE)等共混改性的发展状况,以及矿物微粉与纳米粒子填充改性硅橡胶的研究进展,并比较了各种方法之间的优缺点,最后对目前存在的问题与未来的发展方向提出了一些看法。 相似文献
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The relations between the properties and the blend ratios of natural rubber (NR) and styrene-butadiene rubber (SBR) blends were studied in comparison with four blending methods. The relations between the properties of unvulcanized and vulcanized blends and the blend ratios of blends prepared by means of solution blending, latex blending, roll blending, and Banbury mixer blending were studied. In practice, such rubber blending methods as roll blending are more effective for obtaining uniform blends than Banbury mixer blending the latter. In roll blending, it is more effective to blend NR and SBR by way of a master-batch in which the ingredients are compounded beforehand than to blend raw rubber. In solution and latex blending, very uniform blends are easily obtained. It was found, however, that the properties of NR/SBR blends prepared carefully showed a direct relation to their blend ratios, regardless of blending method used. 相似文献