不同增塑剂对喷蜡天然橡胶/顺丁橡胶自润滑性能的影响

研究了增塑剂种类如芳烃油、环烷油、邻苯二甲酸二辛酯(DOP)、石蜡油、三甘醇二异辛酸酯(3G8)、古马隆等对以油酸酰胺为润滑剂的自润滑喷蜡天然橡胶(NR)/顺丁橡胶(BR)共混胶硫化特性、力学性能、耐屈挠疲劳性能、摩擦系数、Payne效应、损耗因子(tan δ)的影响,对比分析了几种增塑剂应用于喷蜡NR/BR共混胶的自润滑效果。结果表明,加入3G8的NR/BR共混胶焦烧时间(t_(10))和正硫化时间(t_(90))较短,抗拉强度较大,耐屈挠疲劳性好,动摩擦系数和静摩擦系数最小,自润滑效果最好。另外,研究发现几种增塑剂对NR/BR胶料的炭黑分散效果影响较小,Payne效应区别不大,储能模量(G′)-应变曲线变化一致,NR/BR硫化胶的硬度、耐老化性能相差不大。     

活化胶粉在输送带覆盖胶中的应用

研究活化胶粉用量对丁苯橡胶(SBR)性能的影响以及活化胶粉用量为45份时生胶[天然橡胶(NR)/SBR/顺丁橡胶(BR)]并用比对输送带覆盖胶性能的影响。结果表明,随着活化胶粉用量的增大,SBR胶料的定伸应力增大,拉伸强度降低,拉断伸长率和磨耗量减小,耐热老化性能改善,活化胶粉用量以45份为佳。活化胶粉用量为45份时,对于NR/SBR/BR覆盖胶,当NR用量不变时,随着SBR用量减小和BR用量增大,胶料的Fmax增大,t10缩短,硫化速率加快;当SBR用量不变时,随着NR用量减小和BR用量增大,胶料的FL和Fmax降低,t10变化不大,t90缩短,硫化效率提高。在输送带覆盖胶中加入45份活化胶粉,胶料的工艺性能好,生产成本大幅降低。     

NR/SBR内胎胶配方的改进

对天然橡胶(NR)/丁苯橡胶(SBR)内胎胶配方进行调整:降低NR用量比例,调整补强体系和硫化体系。结果表明:NR/SBR并用比由60/40减小到50/50,胶料的门尼粘度较大,焦烧时间较长,加工安全性较好,热老化后性能下降率低,其他性能差异不大;成品内胎的耐热老化后性能明显改善,生产成本降低。     

低相对分子质量反式1，4-聚异戊二烯蜡在橡胶助剂造粒中的应用

用低相对分子质量反式1，4-聚异戊二烯蜡作载体对硫黄、氧化锌和促进剂CZ进行造粒，研究助剂造粒对NR／SBR胶料性能的影响；在助剂造粒过程中加入表面活性剂，考察其对造粒效果及BR／SBR胶料性能的影响。结果表明，助剂造粒后可增大NR／SBR胶料的门尼粘度，对胶料的正硫化时间和硫化胶的物理性能影响不大；在助剂造粒过程中加入表面活性剂，可提高BR／SBR胶料的混炼速度，改善加工性能，对硫化胶的物理性能影响不大。     

BR对SSBR/NR/BR并用胶性能的影响

采用机械混合法在SSBR/NR胎面胶中加入BR胶料,研究了BR对SSBR/NR/BR胎面胶门尼粘度、力学性能及流变性能的影响。结果表明,随着BR用量的增加,SSBR/NR/BR并用胶的门尼粘度降低,拉伸强度、撕裂强度和硬度等力学性能有所下降,但拉断伸长率得到提升,阿克隆磨耗显著降低,降幅约30%;当(SSBR/NR)/BR并用比为60/40时,胶料的流动性最好,损耗模量最小,填料的分散度最好;由DMA测试可知,加入BR降低了胶料的抗湿滑性,但对滚动阻力影响较小。     

纳米氧化锌在NR/BR并用胶及SBR胶料中的应用

研究纳米氧化锌替代普通氧化锌在天然橡胶(NR)/顺丁橡胶(BR)并用胶以及丁苯橡胶(SBR)胶料中的应用。结果表明,纳米氧化锌减量10%代替普通氧化锌,NR/BR并用胶及SBR胶料的加工性能和物理性能基本不变,质量减小,成本降低。     

均匀增粘剂H-501对NR/SBR/BR性能的影响

研究均匀增粘剂H—501和NR／SBR／BR并用比对胶料物理性能的影响。结果表明，均匀增粘剂H—501有利于提高NR／SBR／BR混炼胶的分散均匀性，能提高并用胶硫化胶的拉伸性能、耐疲劳性能和耐磨性能，而且不影响胶料的硫化速度，不降低其老化性能。均匀增粘剂H—501可明显提高NR／SR并用胶，特别是SR用量较大的并用胶硫化胶的综合性能。     

SBR/BR/SITPV共混胶料的制备及性能研究

将苯乙烯丁二烯热塑性弹性体(SBS)/丁基橡胶(IIR)动态硫化弹性体(SITPV)与丁苯橡胶(SBR)/顺丁橡胶(BR)共混制备的胶料SBR/BR/SITPV,与直接共混制备的SBR/BR/IIR胶料进行对比。结果表明,SITPV的加入会改善IIR与SBR/BR体系的相容性,降低IIR对SBR/BR体系的影响。具体表现为焦烧时间(t_(C10))和工艺正硫化时间(t_(C90))小幅度降低,共混胶料拉伸强度、撕裂强度小幅度下降,硬度有所增加,回弹性能保持稳定。同时共混胶料在0℃和10℃左右的损耗因子(tan δ)有较大的提高,说明该共混胶料的止滑性有所提高。     

反式聚辛烯橡胶改性天然橡胶/顺丁橡胶共混胶的性能

研究了反式聚辛烯橡胶（TOR）改性天然橡胶（NR）/顺丁橡胶（BR）（二者质量比80/20）共混胶的性能。结果表明,采用5～15份（质量,下同）TOR改性NR/BR混炼胶的门尼黏度逐渐降低、Payne效应基本不变,共混胶的焦烧时间和工艺正硫化时间延长、硫化速率减慢。相比NR/BR硫化胶,NR/BR/TOR硫化胶的拉伸强度、扯断伸长率和撕裂强度明显减小,回弹性能提高,100%定伸应力、硬度和滚动阻力略有增大,压缩生热有所升高,耐磨和耐疲劳裂纹引发性能得到改善。用TOR改性NR/BR共混胶时的最佳用量为5份。     

润滑剂对自润滑橡胶制品性能的影响

试验研究润滑剂品种和用量对以NR／BR为主体材料的自润滑橡胶制品性能的影响，重点考察NR／BR胶料硫化特性、硫化胶物理性能、摩擦因数和耐磨性。结果表明，在相同润滑剂用量下，酰胺类润滑剂EB和B-2的润滑效果较好；当酰胺类润滑剂用量为10-15份时，NR／BR硫化胶的综合性能较好；自润滑橡胶制品的自润滑效果可以用硫化胶的摩擦因数和耐磨性共同表征。     

均匀剂在橡胶加工过程中的应用效果

研究了3种国外均匀剂产品40MS,60NS和M40和NR／BR及NR／BR／SBR共混体系中的应用效果。试验结果表明,均匀剂可改善胶料的加工流动性,降低胶料的门尼粘度和混炼功耗,提高混炼胶的相态均匀性,缩短炭黑的混入时间,对硫化胶的物理性能影响不大,相对而言,均匀剂M40对NR／BR和NR／BR／SBR共混体系的综合性能影响效果最好,当用量为3份时可达到加工性能和使用性能的最佳平衡。     

A Study of Rheological Behavior and Compatibility of NR/BR Blends

In this study, we research the Mooney viscosity, curing rates, and processibility of natural rubber (NR) and polybutadiene rubber (BR) blends at different blending ratios. The changing values are measured during vulcanization processing and were tested by Mooney viscometer, Monsanto viscometer, etc. The results of scanning electron microscope (SEM) and dynamic mechanical analysis (DMA) experiments are used to explore the surface morphologies and molecular mobility of NR/BR blends.

The experimental results indicate that Mooney viscosity tends to decrease with increasing NR content of NR/BR blends, and this results in superior processibility of NR/BR blends with increasing NR content. NR/BR blends' curing rate improved with increasing NR content. The DMA experimental results show that the temperature is suitable to produce a character peak (T_αn) in molecular motions of NR/BR blends. There tends to a lower temperature range with decreasing NR content of NR/BR blends. In addition, T_αb would move to a lower temperature with decreasing BR content of NR/BR blends.     

用于全钢子午线轮胎胎侧胶的反式-1,4-聚异戊二烯/天然橡胶/顺丁橡胶并用胶的性能

研究了不同反式-1,4-聚异戊二烯(TPI)用量对用于全钢子午线轮胎胎侧胶的TPI/天然橡胶(NR)/顺丁橡胶(BR)并用胶力学性能、动态力学性能和热老化性能的影响,并对并用胶进行了配方优化。结果表明,当TPI/NR/BR的并用比(质量比)为15.0/42.5/42.5时,混炼胶外表光滑,硬度适中;TPI/NR/BR并用胶的硫化特性与NR/BR并用胶相比变化不大,且在保持后者力学性能的基础上,动态力学性能明显提高;经配方优化后,并用胶耐屈挠性优异,滚动阻力、压缩生热降低,是一种较为理想的全钢子午线轮胎胎侧胶材料。     

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     

炭黑改性顺丁橡胶在乘用车子午线轮胎胎侧胶中的应用

通过在乘用车子午线轮胎胎侧胶配方中加入不同的顺丁橡胶,探讨了普通顺丁橡胶、钕系顺丁橡胶和炭黑改性顺丁橡胶对胎侧胶性能的影响。结果表明,用炭黑改性顺丁橡胶所制备混炼胶的门尼黏度较高,焦烧时间缩短,硫化时间延长,最小和最大转矩均增大;硫化胶的定伸应力、拉伸强度和回弹性均升高,60 ℃时的损耗因子下降;成品轮胎的滚动阻力降低。     

硅藻土/白炭黑复合填料的补强性研究

为拓展硅藻土在高分子复合材料中的应用,将硅藻土/白炭黑填充到天然橡胶/丁苯橡胶/顺丁橡胶中制备了复合材料。通过RPA2000和扫描电镜分析了复合填料的Payne效应和分散性,考察了硅藻土用量对复合材料工艺性能、力学性能、耐磨耗性能影响。结果表明:少量硅藻土的加入有利于白炭黑在橡胶中的分散,能降低复合材料的门尼粘度和Payne效应,提高复合材料的硫化速度,缩短硫化时间,复合填料的补强效果较好;随着硅藻土用量的增加,复合填料容易聚集,其力学性能呈下降趋势,而磨耗性能变化不大;当硅藻土用量10~20份时,复合材料的综合性能最好。     

Effect of silanized silica nanofiller on tack and green strength of selected filled rubbers

BACKGROUND: Tack and green strength of filled and gum (unfilled) natural rubber (NR), poly(styrene‐co‐butadiene) rubber (SBR), polybutadiene rubber (BR) and (SBR‐BR) blend with different loadings of reinforcement agent, silanized silica nanofiller (Coupsil 8113), were studied and the results compared and discussed. RESULTS: It was found that silica was fully dispersed in rubber matrix after 13 min of mixing. In addition, with some exceptions for NR and (SBR‐BR) blend, filler loading decreased the tack strength of the studied filled rubbers. Green strength and Mooney viscosity increased with filler loading for all studied filled rubbers but with different rates and amounts. The optimum filler loadings for NR and (SBR‐BR) filled blend were 30 and 10 phr, respectively. Tacks of NR filled rubbers were much higher than those of synthetic filled rubbers. CONCLUSION: It was concluded that filler loading alters substantially the tack and green strength of the rubbers under investigation. Copyright © 2009 Society of Chemical Industry