白炭黑Z125对NR和S-SBR硫化胶性能的影响

探讨了白炭黑Z125用量对NR和S-SBR硫化胶性能的影响.结果表明:随Z125用量增大,NR和S-SBR两种硫化胶的物理机械性能得到明显改善,且分别在填充量为45 phr和60 phf时有较好的综合物理机械性能;与S-SBR硫化胶相反,NR硫化胶的耐疲劳破坏性随Z125用量增大明显降低;随屈挠次数的增加,NR硫化胶的割口尺寸单调增大,而S-SBR硫化肢的初始割口尺寸迅速增大,之后稍有升高;随Z125用量增大,NR和S-SBR硫化肢的损耗因子峰值(tan δmax)减小,0～70℃时,NR的损耗因子值(tan δ)和弹性模量(E')增大,S-SBR高于20℃时的tanδ艿值增加,E,基本呈增大趋势.     

NR硫化胶的动态力学性能

采用无转子流变仪、橡胶加工分析仪、动态热机械分析仪研究了相对分子质量、炭黑用量、炭黑粒径、促进剂含量、氧化锌含量、硬脂酸含量和老化时间对NR硫化胶动态力学性能的影响。结果表明,0℃和60℃左右,低相对分子质量NR硫化胶的损耗因子(tanδ)略大于高相对分子质量NR硫化胶;随着炭黑用量的增加,硫化胶tanδ峰值减小,继续增加炭黑用量,NR硫化胶的炭黑网络结构增强,tanδ不断变大;随着炭黑粒径的增加,NR硫化胶的玻璃化转变温度(T_g)略向高温方向偏移,而处在高弹态后,硫化胶的tanδ随着炭黑粒径的增大而减小。     

高耐磨炭黑填充型粉末SBR研究Ⅲ.硫化胶的热空气老化性能

研究了高耐磨炭黑(N330)填充型粉末丁苯橡胶犤P(SBR/N330)犦硫化胶在100℃×48h及72h条件下的热空气老化性能,并与块状SBR/N330机械混炼胶的硫化胶进行了对比。采用RPA2000型橡胶加工性能分析仪测定了硫化胶的损耗因子(tanδ)。结果表明,包覆剂可使P(SBR/N330)硫化胶老化后的拉伸强度和扯断伸长率具有较高的保持率,并提高了硫化胶的压缩疲劳温升及tanδ,但硫化胶的耐磨性能和耐压缩永久变形性能下降。随着包覆剂含量的增加,硫化胶上述性能的变化趋势增强。当包覆剂为5质量份时,老化前后P(SBR/N330)硫化胶的耐屈挠疲劳性能较强。     

不同材料对缺气保用轮胎支撑胶性能的影响

研究高顺式聚丁二烯复合橡胶（VCR）、炭黑、补强树脂、硫黄和促进剂对缺气保用轮胎支撑胶性能的影响。结果表明：在支撑胶中增大炭黑或硫黄的用量,胶料的交联密度增大;VCR、炭黑、补强树脂、促进剂和硫黄用量的增大均可提高硫化胶的硬度和定伸应力,炭黑用量的增大可提高硫化胶的拉伸强度和抗破坏能力,但硫黄用量的增大则导致硫化胶的拉伸强度下降;VCR、炭黑及补强树脂用量增大在提高硫化胶硬度的同时均导致生热增大,促进剂和硫黄用量增大在提高硫化胶硬度的同时可降低生热,减小终动压缩率;增大VCR或炭黑用量不会对硫化胶的耐屈挠疲劳性能产生不利影响,增大补强树脂用量可提高硫化胶的耐屈挠疲劳性能,但增大促进剂或硫黄用量会降低硫化胶的耐屈挠疲劳性能。     

纳米凹凸棒土/炭黑复合填料对天然橡胶/丁苯橡胶/顺丁橡胶并用胶性能的影响

研究纳米凹凸棒土/炭黑N770/炭黑N330复合填料中纳米凹凸棒土/炭黑N770用量比对天然橡胶(NR)/丁苯橡胶(SBR)/顺丁橡胶(BR)并用胶性能的影响。结果表明:采用纳米凹凸棒土/炭黑N770/炭黑N330复合填料时,随着凹凸棒土用量增大,并用胶的F_L和F_(max)增大,硫化速度减慢,物理性能、耐磨性能和耐屈挠性能提高;纳米凹凸棒土/炭黑N770用量比为30/15时,并用胶的综合性能较优异。与添加其他无机填料(陶土、轻质碳酸钙和白炭黑)/炭黑复合填料的并用胶相比,添加纳米凹凸棒土/炭黑复合填料的并用胶拉伸强度和撕裂强度较高,耐屈挠性能较好,耐磨性能稍差。     

炭黑对SSBR-T2000R屈挠疲劳的影响

通过改变炭黑的种类及用量,考察了炭黑粒径、结构度、用量对SSBR-T2000R屈挠性能及断面形貌的影响,并与乳聚丁苯橡胶ESBR-1502作了对比。结果表明,炭黑粒径对SSBR-T2000R屈挠性能有一定影响,粒径太小,炭黑对橡胶分子的吸附力大,使得承受应力的橡胶链段不能很快地通过分子运动产生应力松弛;粒径太大,对SSBR-T2000R硫化胶的补强作用差,强度低,屈挠疲劳性能降低。结构度对SSBR-T2000R屈挠性能的影响比ESRB-1502大。结构度高,SSBR-T2000R屈挠断面较不平整。SSBR-T2000R硫化胶的屈挠疲劳寿命随着炭黑用量的增多先增大后减小,炭黑用量在15份左右时硫化胶的耐屈挠性能最好;炭黑对SSBR-T2000R的补强效果高于对ESBR-1502的,从而使SSBR-T2000R的耐屈挠性能提高较快。     

炭黑品种及用量对胎侧胶耐屈挠性能的影响

研究炭黑品种及用量对胎侧胶耐屈挠性能的影响。结果表明:固定胶料硬度(邵尔A型硬度为75度)时,随着炭黑粒径的增大,胶料的Payne效应减弱,热稳定性能下降,定伸应力增大,拉伸强度减小,压缩疲劳温升和耐屈挠性能降低;固定炭黑品种(N550)时,随着炭黑用量的增大,胶料的Payne效应增强,硬度提高,定伸应力增大,拉断伸长率减小,压缩疲劳温升和耐屈挠性降低;炭黑品种和用量相同时,添加环保芳烃油会降低胶料的压缩疲劳温升和耐屈挠性能。     

超细大粒径硅质粉体材料对天然橡胶性能的影响

选用2种新型超细大粒径硅质粉体材料(牌号为N 90和N 98)填充天然橡胶(NR),考察了填料对NR混炼胶加工性能、硫化特性及硫化胶微观形貌、物理机械性能、耐曲挠疲劳性能的影响。结果表明,相比N 90,N 98的粒径分布窄,平均粒径较小,且表面接枝了硅甲基;添加适量的N 90和N 98均可改善NR混炼胶的加工性能,提高加工安全性; N 90和N 98在橡胶基体中均具有较好的分散性,改善了填料的网络结构;添加N 90和N 98均可使NR硫化胶的拉伸强度和耐磨性能降低,但N 90可提高硫化胶的撕裂强度,当N 90用量为5份时,扯断伸长率和撕裂强度最佳,N 98使硫化胶的撕裂强度降低;添加N 90和N 98均可提高NR硫化胶的耐屈挠疲劳性能,当N 90用量为5份或N 98用量为15份时,耐屈挠疲劳性能最佳。     

炭黑N330在全钢载重子午线轮胎胎体胶中的应用

研究炭黑N330在全钢载重子午线轮胎胎体胶中的应用.结果表明:在胎体胶中以炭黑N330等量替代炭黑N326,胶料的MH增大,炭黑分散性提高,硫化胶的定伸应力增大,压缩生热升高,耐屈挠性能下降;以炭黑N330减量替代炭黑N326,并适当调整硫黄用量,胶料的MH减小,炭黑分散性改善,硫化胶的撕裂强度减小,压缩生热降低,耐屈挠性能提高,成品轮胎的耐久性能达到企业标准要求.     

TPI的门尼粘度对NR/TPI减震制品性能的影响

研究反式异戊橡胶（TPI）的门尼粘度对天然橡胶（NR）/TPI减震性能的影响。结果表明：与NR硫化胶相比,NR/TPI硫化胶的硬度增大,拉伸性能和抗撕裂性能降低,压缩永久变形减小,在－30,23和70 ℃下的耐屈挠龟裂性能提高,但在100 ℃×48 h热老化后23 ℃下的耐屈挠龟裂性能降低;随着TPI门尼粘度的提高,NR/TPI硫化胶的拉伸性能、撕裂强度和回弹值提高,静态压缩永久变形、动静刚度比和损耗因子减小,耐压缩疲劳性能以及在－30,23和70 ℃下的耐屈挠龟裂性能提高;高门尼粘度TPI在橡胶减震制品中的应用性能更优异。     

炭黑填充丁基橡胶动态力学性能研究

文中研究了炭黑类型及用量对IIR(丁基橡胶)动态力学性能的影响。研究结果表明,随着炭黑粒径的增大,tanδ值所对应的温度变化不大(都在-1.5℃左右),tanδmax值呈明显上升的趋势,玻璃化转变区域逐渐变宽,储能模量E’降低。炭黑N990用量增加,IIR硫化胶的玻璃化转变区域逐渐变窄,tanδ峰值逐渐变小,Tg略有升高。     

溶聚丁苯橡胶在绿色轮胎胎面体系中的应用

进行了不同种类溶聚丁苯橡胶在绿色轮胎胎面体系中的应用研究。从试验结果看,溶聚丁苯胶中苯乙烯含量、乙烯基含量的变化,以及所充油品种类的变化,对胶料的基本物理性能及动态性能有一定影响。依据苯乙烯含量及乙烯基含量比较,使用苯乙烯含量高、乙烯基含量低的溶聚丁苯胶的胎面混炼胶tanδ(0℃)低,tanδ(60℃)低,即抗湿滑性差,滚动阻力好;充环保芳烃油(TDAE)的溶聚丁苯胶与充环烷油(NAP-10)的溶聚丁苯胶相比较,充环保芳烃油(TDAE)的溶聚丁苯胶使用后,混炼胶tanδ(0℃)高,tanδ(60℃)低,即抗湿滑性及滚动阻力好。     

Effect of crosslink structures on dynamic mechanical properties of natural rubber vulcanizates under different aging conditions

The effects of crosslink structures on the dynamic mechanical properties (DMPs) of unfilled and carbon black N330‐filled natural rubber (NR) vulcanizates cured with conventional (CV), semiefficient (SEV), and efficient (EV) cure systems and having about the same total crosslink densities were investigated before and after aerobic and anaerobic aging at 100°C. The three unfilled NR vulcanizates cured with the CV, SEV, and EV systems had about the same mechanical loss factor (tan δ) values at about 0°C but showed some apparent differences in the tan δ values in the order EV > SEV > CV at relatively high temperatures of 40–80°C before aging. However, N330‐filled NR vulcanizates gave higher tan δ values than the unfilled vulcanizates and showed little effect of the crosslink types on the tan δ at different temperatures over the glass‐transition temperature (T_g) before aging. Aerobic heat aging increased the T_g and tan δ values of the vulcanizates over a wide range of temperatures from ?80 to 90°C that was mainly due to the changes in the total density and types of crosslinks. The unfilled vulcanizates cured with the CV system showed the greatest change in DMP because of their poor resistance to heat aging. Aerobic heat aging of NR vulcanizates caused a more significant change in the DMP than anaerobic heat aging because of the dominant effect of the oxidative degradation during aerobic heat aging on the main‐chain structure, crosslink structures, and DMPs of the vulcanizates. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 710–718, 2001     

Effect of carbon black/nanoclay hybrid filler on the dynamic properties of natural rubber vulcanizates

In this study, natural rubber (NR) nanocomposites based on carbon black (CB) and two poly(ethylene glycol) (PEG)‐modified clay hybrid filler were fabricated. The morphology and mechanical properties were studied. The dynamic properties of NR vulcanizates were investigated over a range of strain amplitude at two temperatures. It was found that NR with hybrid filler exhibits superior mechanical properties over that with CB as single phase filler. The hybrid filler causes a significant alteration in the dynamic properties of rubber. The Payne effect becomes more pronounced in rubber with modified clay. A decrease in loss factor (tanδ) was observed for rubber with hybrid filler also. The results revealed that the inclusion of nanoclay (NC) could induce a stronger and more developed filler network. Because of the anisotropy of the nanolayers, NC would depress the reconstruction of filler network, or lower the reformation rates when broken down under deformation, giving rise to lower tanδ value at broad temperature range as well as strain amplitude. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

几种新型补强树脂对NR硫化橡胶性能影响的研究

通过炭黑N330与不同品种、不同用量的树脂并用,研究了几种补强性树脂对天然橡胶的补强效果,获得了不同树脂在NR／N330中的最佳用量;加有少量树脂的硫化橡胶综合性能好于单用炭黑补强的胶料。     

环保型抗湿滑橡胶软化剂TY-18在乘用轮胎胎冠胶中的应用

介绍抗湿滑橡胶软化剂TY-18在乘用轮胎胎冠胶中的应用。结果表明：与环保型芳烃油（TDAE）胶料和环保型环烷油（NAP）胶料相比,抗湿滑橡胶软化剂TY-18胶料的玻璃化温度较低,0℃时的tanδ值较大,60℃时的tanδ值较小,抗湿滑橡胶软化剂TY-18胶料具有良好的抗湿滑性能、较低的滚动阻力及优良的耐磨性能,老化前后的其它物理性能与TDAE和环保型NAP胶料基本相同;抗湿滑橡胶软化剂TY-18的价格和密度较低,倾点和粘度远远小于TDAE,用其生产的胶料密度较小,可有效降低轮胎制造成本,大幅降低输送设备的能源消耗;抗湿滑橡胶软化剂TY-18兼具TDAE与NAP的性能优势,可以替代TDAE和NAP用于胎冠胶。     

RPA分析硫黄用量对天然橡胶动态性能的影响

用橡胶加工分析仪(RPA)分析硫黄用量对NR动态性能的影响。结果表明:不同硫黄用量的混炼胶的动态模量随频率的升高和温度的降低而增加,损耗因子降低;应变超过28%,混炼胶的储能模量下降。不同硫黄用量的硫化胶随交联密度的提高,动态性能对频率的依赖性变小,对应变的依赖性变强;而温度越高,硫化胶的"橡胶弹性"越明显。     

炭黑补强NR硫化胶疲劳破坏特性的研究

用断裂力学方法研究炭黑N110，N220和N330补强NR硫化胶的疲劳破坏特性。结果表明，随着疲劳时问的延长，3种炭黑补强硫化胶的拉断形变能密度均减小，且炭黑粒径越小，硫化胶的拉断形变能密度降幅越大；炭黑粒径越小的硫化胶内部潜在缺陷越小，但抗裂纹扩展性能越差，疲劳寿命越短；3种炭黑补强硫化胶的疲劳寿命方程均能较准确地预测其疲劳寿命。     

Effects of hot‐air aging and dynamic fatigue on the structure and dynamic viscoelastic properties of unfilled natural rubber vulcanizates

The effects of hot‐air aging and dynamic tensile fatigue on the network structure and dynamic viscoelastic properties of unfilled natural rubber (NR) vulcanizates were investigated with magnetic resonance crosslink density spectrometry, Fourier transform infrared spectroscopy/attenuated total reflection (FTIR–ATR), and dynamic mechanical analysis. The results showed that there was a carbonyl weak absorption peak at 1723 cm^?1 in the FTIR–ATR spectra of unfilled NR vulcanizates after hot‐air aging; The crosslink density decreased continuously as the aging time increased. The dynamic modulus of an aged specimen declined considerably, and the value of tan δ after 72 h of aging greatly increased. There was a large difference in the FTIR–ATR spectra of unfilled NR vulcanizates before and after tensile fatigue. The peaks at 1597, 1415, and 1015 cm^?1 increased concurrently with the tensile fatigue time. Initial analysis suggested that structures such as conjugated dienes appeared in the network structure. The modulus declined sharply, whereas the value of tan δ increased noticeably, after tensile fatigue. The effects of hot‐air aging and tensile fatigue on the crosslink density and FTIR–ATR spectra of unfilled NR vulcanizates were different, but both affected the viscoelastic properties dramatically. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008