硫化工艺对橡胶垫板动静刚度比的影响

研究了硫化温度、时间、压力等工艺因素对橡胶垫板动静刚度比的影响。结果表明,硫化温度与时间对橡胶垫板动静刚度比的影响是通过橡胶交联密度的变化来体现的,橡胶交联密度越大,动静刚度比越小;硫化压力越大,橡胶垫板的动静刚度比越小。     

三元乙丙橡胶硫化胶力学性能及动静刚度比

研究了硫化剂用量、填充增强剂的种类及用量以及发泡倍率等对三元乙丙橡胶硫化胶力学性能及动静刚度比的影响。结果表明,动静刚度比随着橡胶交联密度的增加、填料增强作用的减弱、填料用量的减少以及发泡倍率的增大而逐渐减小。     

低动静刚度比橡胶垫板的研制

从配方设计和硫化工艺参数确定两方面探讨了低动静刚度比橡胶垫板的制备技术。采用动态热力学分析仪研究主体材料、补强剂、硫化剂等配方因素对天然橡胶硫化胶损耗因子(tanδ)的影响。设计了橡胶垫板的低tanδ优化配方。研究了硫化温度、时间、压力等工艺因素对橡胶垫板动静刚度比的影响,确定了合适的硫化工艺参数,制备出具有低动静刚度比特性的橡胶垫板产品。     

受压与不受压条件对铁路扣件系统减震垫板的静刚度及动静比的长期影响研究

对比研究了长期室外受压与室内不受压存放条件对60-10-17橡胶垫板、WJ7-B橡胶垫板、WJ8-B弹性垫板静刚度及动静比的影响。结果表明,三种试验垫板在室内存储27个月,其静刚度与动静比均满足铁标要求;在长期室外受压模拟试验中,WJ8-B弹性垫板静刚度保持率良好,60-10-17橡胶垫板与WJ7-B橡胶垫板静刚度在受压两个月后超出标准,三者动静比均满足要求。对于影响弹性垫板老化的关键性因素,需要进一步探讨验证。     

测试条件对微孔橡胶垫板动刚度及动静比的影响

建立了微孔橡胶垫板结构简化模型,对动静比与能量损耗的关系进行了定性分析,并考察了测试频率和加载力值对动刚度和动静比的影响。结果表明,在外力作用下,橡胶垫板的内耗越大,则动刚度和动静比越大;随着测试频率和加载力值的增加,动刚度和动静比均增大。     

EPDM材料配方对其微孔垫板刚度性能的影响

研究了硫化体系、填料种类和用量以及发泡剂用量对三元乙丙橡胶(EPDM)微孔垫板静刚度和动静刚度比的影响。结果表明,随着炭黑用量的增大,微孔垫板静刚度增大;随着白炭黑用量的增大,微孔垫板静刚度减小;随着发泡剂用量的增大,微孔垫板静刚度减小。随着炭黑用量的增大,动静刚度比增大;随白炭黑用量的增大,动静刚度比增大;随发泡剂用量的增大,动静刚度比减小。最后得出最佳胶料配方。     

EPDM牌号对其发泡材料结构与性能的影响

研究了EPDM牌号对其发泡材料结构与性能之间关系的影响。结果表明:3960胶料的乙烯含量和门尼黏度低较,第三单体含量较高,发泡材料泡孔数量多而密,孔径尺寸小且分布范围窄,硫化后网状结构紧密,交联密度较大,硫化程度较高,发泡倍率较大,对弹性贡献较大,相对硬度增加较多,受外力作用时,抵抗能力强,当外力撤除后,变形恢复能力强,主要表现为压缩永久变形小,动静刚度比小。     

EPDM发泡减振制品硬度的影响因素与动静比关系

摘要：本文用实验方法探究EPDM发泡材料硬度与动静比之间的关系,讨论刚度与发泡材料减振性能的关系,判定其减振性。实验表明,随着N330、N550用量的增加,硬度、动静比均呈现增大趋势,填充相同用量N550的胶料的硬度较填充的N330大,而填充N330的胶料的动静比比相应的N550的小;随硫黄用量增加,硬度逐渐增大,动静比则呈现减小的趋势;随DCP用量增加,硬度逐渐增大,动静比则呈现先增大后减小的趋势,且在用量为3份时出现最小值,且DCP硫化的EPDM发泡材料动静比较硫黄硫化的大。为了研究EPDM发泡材料硬度与动静比的关系,我们选择了填充体系、硫化体系,探究硫化特性、门尼粘度、交联密度和发泡倍率与硬度的关联,进而分析了硬度与动静比变化趋势。     

微孔橡胶垫板在高铁中的发展与应用

微孔橡胶垫板因其高强度、高弹性、低密度、低滞后、低动静刚度、低温度依存性、高耐疲劳性和高耐老化性等优点,在高铁中的应用越来越广泛。微孔橡胶垫板动静刚度比是表征其性能的一个最主要的因素,胶料配方及工艺制备都会影响微孔橡胶垫板的动静刚度比。本文提出通过借鉴国外经验,加强联合,共同研发,降低生产成本,可实现微孔橡胶垫板大范围使用,为我国高铁交通的健康发展提供更有利的保障。     

配方因素对天然橡胶胶料动静刚度比的影响

研究含胶率、补强体系和硫化体系对天然橡胶(NR)胶料动静刚度比的影响。结果表明:含胶率越大,胶料的动静刚度比越小;与炭黑N774胶料相比,小粒径、大比表面积炭黑N330胶料的硬度和动静刚度比较大,炭黑用量大的胶料动静刚度比较大;随着硫化时间的延长,普通硫黄硫化体系胶料的动静刚度比增大,半有效硫化体系胶料的动静刚度比基本不变。     

氟橡胶/三元乙丙橡胶并用胶的性能

研究了不同并用比(质量比)时氟橡胶(FKM)/三元乙丙橡胶(EPDM)并用胶动态硫化和静态硫化后的低温性能、物理机械性能、耐老化性能和热稳定性,并用扫描电子显微镜表征了并用胶.结果表明,当并用比为30/70时,并用胶有较好的相容性;EPDM可以改善FKM的低温性能;随着EPDM用量的增加,并用胶的拉伸强度及邵尔A硬度降低;动态硫化FKM/EPDM并用胶比静态硫化FKM/EPDM并用胶具有更好的耐老化性能,但老化前前者的拉伸强度稍低于后者;FKM/EPDM并用胶的热稳定性优于纯EPDM;静态硫化FKM/EPDM并用胶中片层现象严重,动态硫化FKM/EPDM并用胶的EPDM包覆在FKM中,但相畴偏大.     

氟橡胶/EPDM动态硫化共混物的研究

研究了动态硫化工艺条件和共混比对氟橡胶（ＦＫＭ）／ＥＰＤＭ共混物拉伸性能拉、热油老化性能和应力松弛性能的影响。结果表明：与直接静态硫化相比,动态硫化可避免两种硫化体系的相互影响;静态硫化共混物拉伸强度只有２ＭＰａ,而动态硫化共混物可达１０ＭＰａ以上;工艺条件对动态硫化共混物性能的影响不大;随共混物中ＥＰＤＭ用量的增大,共混物的热空气老化和热油老化性能均有所下降     

Dynamic properties of rubber vibration isolators and antivibration performance of ethylene–propylene–diene monomer/nylon 6 blend systems

This article examines thermoplastic elastomers (TPEs) and thermoplastic vulcanizates (TPVs) as two types of elastomers from melt-blended and dynamically vulcanized ethylene–propylene–diene monomer (EPDM) rubber materials and nylon 6 plastic materials. A series of investigations were conducted on the mechanical properties, morphology, dynamic mechanical properties, hysteresis behavior, and dynamic antivibration properties with different nylon 6 contents. The experimental results showed that the incompatibility between EPDM and nylon 6 led to the easy destruction of the TPV materials in two interfacial polymers upon the application of an external force. Thus, after a dynamic vulcanization process, the mechanical properties of the EPDM/nylon 6 blends were not as good as those of the TPE materials. In terms of morphology, nylon 6 plastics were uniformly distributed in the EPDM/nylon 6 blends during the EPDM rubber phase before vulcanization was performed. After the dynamic vulcanization, phase inversion was produced in which rubber microparticles were formed and dispersed in the nylon 6 plastic phase. The results of dynamic mechanical analysis, compression vibration hysteresis behavior, and dynamic property antivibration experiments showed that the blends provided better vibration isolation and antivibration performance after the amount of nylon 6 was increased and EPDM and nylon 6 were blended through dynamic vulcanization. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

超临界二氧化碳发泡EPDM/LDPE热塑性弹性体微孔泡沫

本文通过熔融共混制得了EPDM/LDPE热塑性弹性体,压制标准试样,然后使用超临界二氧化碳作为发泡剂在高压反应釜中进行物理发泡。通过万能拉力机测试了弹性体力学性能,用扫描电镜观察了拉伸断面和泡孔的微观结构。结果表明：DCP硫化体系的热塑性弹性体的综合力学性能要优于硫黄硫化体系,随着硫化剂用量的增多,拉伸强度和撕裂强度有一个最大值,硬度上升;橡塑比在4:6时,力学性能达到最佳,最大拉伸强度为7.5MPa,最大撕裂强度为27.6MPa。扫描电镜观察其拉伸断面形貌,表明EPDM橡胶相与LDPE塑料相呈现“海-岛”两相微观结构;泡孔大小均匀性较好,成功制备了微米级微孔泡沫且泡孔大小分布均匀。     

MPU/NBR与MPU/EPDM共硫化匹配性的比较

本文分别对MPU/NBR共混胶和MPU/EPDM共混胶进行了不同并用比的实验研究,分别将二者在硫化特性曲线、拉断强度变化、应力-应变关系、热氧老化性能变化以及动态生热性能变化规律进行对比,结果发现,MPU/EPDM共混胶的硫化匹配程度明显好于MPU/NBR共混胶.在MPU中加入NBR会使得MPU相的硫化受到抑制,硫化程...     

玻璃微珠和炭黑对EPDM胶料硫化特性的影响

考察了玻璃微珠/碳黑用量比对三元乙丙橡胶（EPDM）硫化特性的影响。结果表明,玻璃微珠/炭黑用量比增大时,EPDM胶料的焦烧时间略有延长,最小扭矩和最大扭矩均呈逐步减小的趋势。180 ℃时硫化胶的力学性能优于200 ℃时硫化胶。添加玻璃微珠后,胶料在180 ℃下的正硫化时间缩短近2倍,但200℃下的正硫化时间几乎没有受到任何明显的影响。玻璃微珠会明显减小胶料的硫化温度系数,即添加玻璃微珠后硫化温度对EPDM胶料硫化速度的影响程度将有所减小。     

EPDM/iPB共混型热塑弹性体的制备与性能

通过对比不同共混比的EPDM/iPB共混体系动态硫化与未硫化的力学性能研究发现,动态硫化后的EPDM/iPB体系的性能明显优于未硫化的,当EPDM/iPB的配比为60/40、动态硫化的时间为6min时,综合性能较好;同时,研究了硫化剂和硫化时间等因素对EPDM/iPB力学性能的影响,结果表明:采用DCP/S作为硫化剂、...     

Investigation of crystallization behavior in dynamically vulcanized EPDM–nylon copolymer blends

A thermoplastic vulcanizate (TPV) of a ethylene–propylene–diene terpolymer (EPDM) and nylon copolymer (PA) was prepared by dynamic vulcanization. Maleic anhydride (MAH)–grafted EPDM (EPDM–g–MAH), MAH‐grafted EPR (EPR–g–MAH), and chlorinated polyethylene (CPE) were used as compatibilizers. The effect of dynamic vulcanization and compatibilizer on the crystallization behavior of PA was investigated. Differential scanning calorimeter measurement results showed no pronounced shift in the crystallization temperature for PA in EPDM–PA TPV compared to that for PA in the neat state, whereas the crystallization temperature increased after adding compatibilizer. The decrease in the crystallinity of TPVs was a result of the crystallization occurring in confined spaces between rubber particles. The equilibrium melting temperature (Tm⁰) of the PA copolymer was measured and was determined to be 157°C. The isothermal crystallization kinetics of PA in the neat and TPV states also was investigated. The crystallization rate was highest in the compatibilized TPV and lowest in the neat PA, whereas it was intermediate in the uncompatibilized TPV unvulcanized blends. Compared with unvulcanized EPDM–PA blends, the dynamic vulcanization process seemed to cause an obvious increase in the crystallization rate of the PA copolymer, especially when a suitable compatibilizer was used. This occurred because the dynamic vulcanization introduced fine crosslinked rubber particles that could act as heterogeneous nucleating centers. In addition, the use of a suitable compatibilizer permitted the formation of finely dispersed vulcanized rubber particles and therefore increased the density of the nucleating centers. The complex morphology of the blends was investigated by atomic force microscopy to evaluate the effect of compatibilizer on the size of the dispersed rubber particles. Compared with the morphology of TPVs with the same dosage of EPDM–g–MAH compatibilizer, the morphology of TPVs using EPR–g–MAH as compatibilizer showed much smaller dispersed rubber particles, which may have contributed to the higher crystallization rate. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 824–829, 2003     

新型注射级EPDM/PP材料的研制

本文叙述了注射级ＥＰＤＭ／ＰＰ材料的研制过程，采用动态硫化方法，找出了适宜的橡塑比例及其它助剂的种类、用量、工艺参数。返炼后性能对比显示材料具有工业应用价值。     

动态硫化EPDM/高聚合度PVC热塑性弹性体力学性能的研究

采用动态硫化的方法制备了三元乙丙橡胶（EPDM）/高聚合度聚氯乙烯（HPVC）热塑性弹性体。考察了PVC聚合度、橡塑比、增塑剂添加量、硫化剂用量（质量分数）及不同促进剂配比对体系性能影响,研究了动态硫化工艺条件（硫化时间和硫化温度）对体系性能的影响。实验结果表明：采用动态硫化方法,选用HPVC-2500、橡塑比为30/70、DOP用量为35份、硫化用量为0.4份及合适促进体系,可以制得性能优良的EPDM/HPVC热塑性弹性体,拉伸强度能达到15.18 MPa,断裂伸长率能达到544%。