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研究了氯化聚乙烯橡胶(CM)/丁苯橡胶(SBR)共混比对其共混胶硫化特性、力学性能、耐热老化性能和耐油性能的影响。结果表明,随着CM用量的增大,共混胶正硫化时间延长,耐热老化性能和耐油性能均升高;当CM/SBR共混比为40/60时,共混胶具有较好综合力学性能。 相似文献
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采用机械混炼法制备了纳米三氧化二铝(Al_2O_3)增强天然橡胶(NR)/丁苯橡胶(SBR)并用胶,研究了纳米Al_2O_3对NR/SBR并用胶的硫化特性、力学性能、耐热性和耐溶剂性的影响。结果表明,当纳米Al_2O_3的用量为4份,并采用NR/SBR与小料共混均匀后再加入纳米与硫黄的方式制备NR/SBR并用胶,可大幅提高NR/SBR并用胶的力学性能。与未增强并用胶相比,采用4份纳米Al_2O_3增强并用胶的100%定伸应力、拉伸强度、撕裂强度和扯断伸长率分别提高了16.0%、296.4%、28.6%和73.3%,耐热性及耐油性也得到显著提高。 相似文献
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研究了抗氧剂GM对SBR/HAF共混胶的硫化特性、力学性能和耐热老化性能的影响,并通过TG分析表征共混胶的耐热稳定性.结果表明,抗氧剂GM具有防止焦烧和软化胶料的作用,随着GM用量的增大,共混胶的伸长率和撕裂强度升高,硬度下降.共混胶的耐热老化性能随抗氧剂GM用量增大而提高,GM用量以3份为宜.TG分析表明,加入抗氧剂... 相似文献
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有机蒙脱土对天然橡胶/丁苯橡胶的补强及增容作用 总被引:1,自引:0,他引:1
采用机械混炼法制备了天然橡胶(NR)/丁苯橡胶(SBR)/有机蒙脱土(OMMT)纳米复合材料,采用TEM和XRD对复合材料的亚微观结构进行了表征,并对复合材料的表观交联密度、静态力学性能、动态力学性能和硫化热效应进行了研究。结果表明,复合材料为剥离型纳米复合材料;OMMT能够明显提高纳米复合材料的交联密度和静态力学性能;OMMT导致NR/SBR共混胶动态损耗因子降低,并且能够促使NR和SBR玻璃化转变温度更为接近,起到了增容作用;OMMT实现了NR和SBR两相的同步硫化。 相似文献
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Huanhuan Dong Yuanfang Luo Jing Lin Jie Bai Yongjun Chen Bangchao Zhong Demin Jia 《应用聚合物科学杂志》2020,137(26):48838
Rubber blends are widely used for combining the advantages of each rubber component. However, to date, how to determine and distinguish the vulcanization kinetics for each single rubber phase in rubber blends during the co-vulcanization process is still a challenge. Herein, high-resolution pyrolysis gas chromatography–mass spectrometry (HR PyGC-MS) was employed for the first time to investigate the vulcanization kinetics of natural rubber (NR) and styrene–butadiene rubber (SBR) in NR/SBR blends filled with modified silica (SiO2). The reaction rates of crosslinking of each rubber phase in NR/SBR were calculated, which showed that the crosslinking rates of NR were much lower than those of SBR phase in the unfilled blends and blends filled with unmodified and silane modified silica. Interestingly, the vulcanization rates of NR and SBR phase were approximately same in the vulcanization accelerator modified silica filled blends, showing better co-vulcanization. In addition, the vulcanization accelerator modified silica was uniformly dispersed and endowed rubber blends with higher mechanical strength compared to the untreated silica. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48838. 相似文献
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NR/TPI并用胶半有效硫化体系的研究 总被引:1,自引:0,他引:1
考察了促进剂NS用量、硫黄用量和硫载体DTDM对NR/反式-1,4-聚异戊二烯(TPI)并用胶性能的影响.结果表明,在半有效硫化体系中,硫黄用量1.2~1.4份,促进剂NS用量1.4~1.6份时,NR/TPI(80/20)并用胶可以获得良好的综合性能.NR/TPI中使用DTDM后,硫化速度虽略有降低,但胶料焦烧时间延长,加工安全性提高,硫化胶物理机械性能、疲劳性能、滚动阻力以及耐老化性能均得到改善,这与DTDM在NR中的应用相似. 相似文献
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The curing characterizations of natural rubber (NR) and styrene butadiene rubber (SBR) lattices and their blends with and without NR-g-MA and SBR-g-MA were studied by using oscillating disc rheometer methods. The minimum value for torque decreases with increasing NR in the blends and with the incorporation ofNR-g-MA and SBR-g-MA. The value of maximum torque increases with increasing of SBR in the blend and with the presence of (NR-g-MA and SBR-g-MA) is decreased. The mechanical properties of the samples were studied. The tensile strengths increased steadily with an increase of NR content in the blend. Thermal characteristics of these latex blends were studied by thermogravimetric analysis. Thermal degradation of these individual lattices and their blends were investigated with special reference to blend ratio and vulcanization techniques. As the SBR content in the blends increased their thermal stability was also found to increase. POLYM. COMPOS., 2009. © 2009 Society of Plastics Engineers 相似文献
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Development of novel elastomeric blends containing natural rubber and ultra-low-density polyethylene
This study sought to develop novel elastomeric compounds using natural rubber (NR) and ultra-low-density polyethylene (ULDPE). Blends were prepared by means of a two-roll mill for three ratios (70/30, 60/40, and 50/50 NR/ULDPE). Conventional vulcanization was performed in a compression mold. The physical and mechanical properties of the blend were determined according to ASTM standards. The results were compared with those obtained from NR blended with styrene-butadiene rubber (SBR). The morphological examinations with scanning electron microscopy indicated that ULDPE was compatible with NR; thus, the addition of a compatibilizer was not necessary. The cocontinuous phase was dominant in the NR/ULDPE blend containing 50 and 60 wt % NR. The tensile properties, tear resistance, and aging resistance of the NR/ULDPE blends were found to be superior to those of NR/SBR blends. On the other hand, the abrasion and flex cracking resistances of the NR/ULDPE blend were inferior to those exhibited by SBR blends but the Mooney viscosity and resilience of both blends fell in the same range. However, the addition of dicumyl peroxide appeared to have caused crosslinking of the ULDPE phase in the blend, which in turn increased the tensile properties and abrasion and aging resistance. The properties of the tertiary NR/SBR/ULDPE blend were investigated as well. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 650–660, 2001 相似文献
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研究了抗氧剂GM、抗氧剂264和抗氧剂2246对SBR/HAF混炼胶的硫化特性、力学性能和耐热老化性能的影响,并通过TG分析表征混炼胶的耐热稳定性.结果表明,与抗氧剂264和抗氧剂2246相比,添加抗氧剂GM的混炼胶具有更好的防焦烧性能,更高的力学性能以及更优异的耐热老化性能.TG分析表明,在三种抗氧剂中,加入抗氧剂G... 相似文献
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《塑料、橡胶和复合材料》2013,42(7):302-308
AbstractThe blends of styrene butadiene rubber (SBR) and natural rubber (NR) are prepared using a two-roll mixing mill in the presence of different types of carbon blacks as reinforcing filler. The effects of fillers on cure characteristics and thermal, dynamic–mechanical, morphological properties of the blends are studied. The ISAF N231 type of carbon black shows a significant effect on tensile, tear and modulus properties by reacting at the interface between SBR/NR matrixes. The dynamic characteristics and storage modulus of SBR/NR with SAF N110 and SRF N774 types of carbon black show distinct characteristics in respect to all other blends in this system. The thermal stability of the rubber vulcanizates containing SAF N110 and SRF N774 types of carbon blacks is higher than other blend types. With the increasing percentage of SBR to NR, the thermal stability of the blend is increased. However, the heat buildup of the blends increases with the increase in SBR percentage. 相似文献
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分别采用一段和两段模压法制备了以顺丁橡胶(BR)/丁苯橡胶(SBR)/天然橡胶(NR)为基体的橡胶发泡材料,研究了三种化学发泡剂N,N'-二甲基戊次甲基四胺(H)、4,4'-氧代双(苯磺酰肼)(OBSH)以及H/OBSH(质量比1:1)复配对发泡及硫化特性的影-向,以及3种发泡剂和2种成型工艺对收缩率及相结构的影响。结果表明,发泡剂H对硫化性能影响最大,含发泡剂H的混炼胶在分解过程中释放的热量最多;加入3种发泡剂都具有一种较大的泡孔镶嵌在较小的泡孔丛中的泡孔形态;密度和线收缩率均随着时间的增加而增加,经H/OBSH复配的发泡剂更适合该体系成型,材料线收缩率均比单独使用H和OBSH小,两段模压法可以有效地提高发泡材料的尺寸稳定性,收缩率降低至3.88%,同时发泡剂使用率最多可提高31.67%。 相似文献