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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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NR/BR/TPI共混物硫化体系的研究 总被引:1,自引:0,他引:1
研究了普通硫化体系(CV)、半有效硫化体系(SEV)和有效硫化体系(EV)对NR/BR,TPI共混物(共混比为40/40/20)性能的影响,特别是CV体系中硫黄和促进剂DM用量的影响。结果表明,采用CV体系,NR/BR/TPI共混物的耐疲劳性能等物理性能较好,硫黄用量为3份、促进剂DM用量为1份时,共混物的撕裂强度和耐屈挠性能最好,其它性能也保持在较高水平。配合剂直接加入共混胶中混炼比分别加入3种生胶混炼后再加以混合的方式可获得更好的力学性能,但正硫化时间和焦烧时间缩短。 相似文献
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研究多功能交联剂WY988在输送带覆盖胶中的应用。结果表明:在天然橡胶(NR)胶料和NR/顺丁橡胶(BR)并用胶中添加多功能交联剂WY988,并减小促进剂和硫黄用量,可以达到等效的硫化促进效果;多功能交联剂WY988与炭黑N234配合使用的胶料耐磨性能与炭黑N115/N234并用的胶料相近;添加多功能交联剂WY988的NR胶料和NR/BR并用胶耐老化性能提高;NR胶料的多功能交联剂WY988硫化体系优化配合为多功能交联剂WY988 0.6,硫黄0.26,促进剂0.4,硫化剂DTDM 2;NR/BR并用胶的多功能交联剂WY988硫化体系优化配合为多功能交联剂WY988 0.6,硫黄0.26,促进剂0.8,硫化剂DTDM 1.6。 相似文献
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研究硫黄、促进剂NS和硫化剂DTDM用量对天然橡胶(NR)胶料性能的影响。在半有效硫化体系中,当硫黄用量为1.8~2份,促进剂NS用量为1.4~1.6份,硫化剂DTDM用量为0.6~0.8份时,NR硫化胶具有较好的物理性能和耐磨性能。利用正交试验法,确定硫黄、促进剂NS和硫化剂DTDM及其交互作用对NR胶料耐磨性能的影响,并通过直观分析和方差分析确定NR胶料DIN磨耗量最小的半有效硫化体系的配方为:硫黄1.8,硫化剂DTDM 0.8,促进剂NS1.4。 相似文献
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采用硫黄硫化体系和过氧化物(硫化剂DCP)硫化体系对EPDM/NR并用胶实施复合交联,考察了不同共混比EPDM/NR共混胶的硫化特性、硫化胶的物理机械性能、耐水性及耐溶剂性能。结果表明:复合交联后,胶料的硫化特性、物理机械性能均有所提高;EPDM母炼胶中DCP的用量要高于NR;胶料共混比为80/20(EPDM/NR),其耐水性和耐溶剂性能达到最佳。 相似文献
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通过对9.00-20 16PR轮胎胎冠胶、缓冲层、胎肩胶和胎体帘布层内外层胶的配方优化,提高了轮胎的速度、耐久性能.胎冠胶采用NR/BR(50/50)并用、炭黑N234/N220并用(用量54份);胎肩胶采用NR/BR(90/10)并用、硫化体系为促进剂NOBS、硫化剂DTDM和硫黄;缓冲胶采用全NR,炭黑N330/N660并用(用量44份)、硫化体系为促进剂CZ、不溶性硫黄与硫化剂DTDM;内外层胶采用NR/SBR/BR并用、炭黑N330/N660并用(用量40份)、硫化体系采用促进剂NOBS、DM、硫化剂DTDM和硫黄并用.改进后轮胎的速度性能达到110 km·h-1级运转h,耐久性超过120h. 相似文献
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在天然橡胶(NR)/顺丁橡胶(BR)/丁苯橡胶(SBR)为基体的自润滑喷蜡橡胶材料中加入芥酸酰胺,考察芥酸酰胺作为润滑剂时对NR/BR/SBR自润滑喷蜡橡胶材料的硫化特性、力学性能、门尼黏度、摩擦系数及耐老化性能的影响。结果表明,与未加芥酸酰胺的胶料相比,当芥酸酰胺用量为10份时,胶料转矩减小,焦烧时间和正硫化时间缩短,扯断伸长率从388%增加至523%,拉伸强度降低了21.36%,邵尔A硬度、压缩永久变形分别下降5.56%和8.74%,动、静摩擦系数分别减小23.46%和24.82%,门尼黏度降低20.89%,耐热氧老化性能下降。硫化胶拉伸100%停放5 min后,表面出现明显的白色润滑膜,胶料流动性变好,各组分分散得更均匀,断面更光滑。 相似文献
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《塑料、橡胶和复合材料》2013,42(9):365-372
AbstractBis-(triethoxysilylpropyl)-tetrasulfane functionalised carbon nanotubes (t-CNTs) were used as compatibiliser along with liquid isoprene rubber (LIR) in the natural rubber (NR)/polybutadiene rubber (BR) blend. Their reinforcing and compatibilising effects were evaluated by mechanical, fatigue crack growth resistance properties and blend homogeneity. Scanning electron microscope and transmission electron microscope showed enhanced interfacial adhesion between the binary rubber phases and improved dispersion of the minor phase in the rubber blend respectively with the co-existence of LIR and carbon nanotubes. The tensile strength of the carbon black (CB) filled NR/BR blend reached its optimum when 3 phr CB was replaced with an equal amount of t-CNTs in the presence of 7 phr LIR, while the fatigue crack growth resistance property achieved its maximum in the presence of 3 phr LIR. This interesting co-compatibilisation behaviour of t-CNTs and LIR suggests that t-CNTs have a better effect than CB with the assistance of LIR, which is an effective plasticiser in the NR/BR blend. 相似文献
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Zinc butyl xanthate [Zn(bxt)2] was prepared in the laboratory. The effect of this xanthate with zinc diethyl dithiocarbamate (ZDC) on the vulcanization of natural rubber (NR), polybutadiene rubber (BR), and NR/BR blend has been studied at different temperatures. The amounts of Zn (bxt)2 and ZDC in the compounds were optimized by varying the amount of ZDC from 0.75 to 1.5 phr and Zn (bxt)2 from 0.75 to 1.5 phr. The cure characteristics were also studied. HAF filled NR, BR, and NR/BR blend compounds were cured at different temperatures from 60 to 150°C. The sheets were molded and properties such as tensile strength, tear strength, crosslink density and elongation at break, compression set, abrasion resistance, etc. were evaluated. The results show that the mechanical properties of 80NR/20BR blends are closer to that of NR vulcanizates, properties of 60NR/40BR blends are closer to BR vulcanizates, while the 70NR/30BR blends show an intermediate property. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3516–3520, 2007 相似文献
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Sung‐Seen Choi 《应用聚合物科学杂志》2000,75(11):1378-1384
Variation of the crosslink density of a rubber vulcanizate depending on the rubber composition after the thermal aging was studied with single rubber, biblend, and triblend vulcanizates of natural rubber (NR), butadiene rubber (BR), and styrene‐butadiene rubber (SBR). The efficient vulcanization (EV) system was employed to minimize the influence of free sulfur in the vulcanizate on the change of the crosslink density. Thermal aging was performed at 40, 60, and 80°C for 20 days with 5‐day intervals. The crosslink densities of the vulcanizates after the thermal aging increase. For the single rubber vulcanizates, variation of the crosslink density by the thermal aging has the order: SBR > BR > NR. For the biblend vulcanizates, variations of the crosslink densities of the NR/SBR and SBR/BR blends are larger than that of NR/BR blend. Variation of the crosslink density of the vulcanizate increases by increasing the SBR content in the vulcanizate. Variation of the crosslink density of the rubber vulcanizate depending on the rubber composition was explained by miscibility of the blends, combination reaction of the pendent groups, and mobility of the pendent group. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1378–1384, 2000 相似文献
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采用低相对分子质量的液体环氧树脂(EP)与固化剂混合作为增强体的前驱体,比较了其填充天然橡胶(NR)、顺丁橡胶(BR)及两者并用胶的物理机械性能,考察了EP用量对并用胶及炭黑增强并用胶物理机械性能的影响,并通过扫描电子显微镜表征了填充后的NR、BR及并用胶的微观相态结构。结果表明,EP的加入均可提高NR、BR、NR/BR并用胶的物理机械性能,其中并用胶的拉伸强度提高幅度最大;当EP用量约为24份时,NR/BR并用胶的综合性能最佳;EP可以提高炭黑增强NR/BR并用胶的物理机械性能,但提高幅度不大;EP在NR/BR并用胶中呈现规整的圆球形状,直径为1.0~2.5μm。 相似文献