偶联剂和离子液体改性白炭黑补强天然橡胶性能的研究

研究偶联剂(Si69和B-69)与离子液体溴化1-丁基-3-甲基咪唑(BMIM)单用和并用改性白炭黑补强天然橡胶(NR)的性能。结果表明:与未改性白炭黑补强NR胶料相比,偶联剂Si69、偶联剂B-69和BMIM改性白炭黑补强NR胶料的硫化速率加快,Payne效应减弱,物理性能和耐磨性能提高,滚动阻力降低,偶联剂Si69改性白炭黑的效果优于偶联剂B-69;与偶联剂单用改性白炭黑补强NR胶料相比,偶联剂/BMIM并用改性白炭黑补强NR胶料的硫化速率加快,白炭黑与NR相互作用增强,交联密度增大,物理性能和耐磨性能显著提高,滚动阻力降低,偶联剂B-69/BMIM并用改性白炭黑补强NR胶料的滚动阻力小于偶联剂Si69/BMIM并用改性白炭黑补强NR胶料,抗湿滑性能相差不大;BMIM改性白炭黑补强NR胶料的综合性能最佳。     

白炭黑/偶联剂补强橡胶的性能研究

研究炭黑N330／白炭黑并用比和偶联荆品种及用量对NR胶料性能的影响。结果表明，硅烷偶联剂Si69对白炭黑的改性效果优于钛酸酯偶联剂；硅烷偶联剂Si69在NR胶料中的最佳用量以补强剂用量的5％～10％为宜；建立的数学模型能较好地拟合炭黑N330／白炭黑并用比和硅烷偶联剂Si69用量与NR胶料各项性能之间的关系。     

白炭黑/炭黑复合填料对天然橡胶补强性能的研究

炭黑和白炭黑是橡胶主要的补强填料,可以显著提升橡胶的性能。虽然炭黑和白炭黑有各自的优势,但白炭黑/炭黑共用可以更好地提高天然橡胶(NR)的物理性能和动态性能。本工作用不同用量比的白炭黑/炭黑复合填料(用量50份)补强NR,考察胶料的拉伸强度、撕裂强度、耐磨性能、抗裂口增长性能、生热性能和滚动阻力等。结果表明,复合填料的白炭黑用量为20份和30份时NR胶料综合性能较好。     

精氨酸辅助制备白炭黑补强天然橡胶的研究

采用精氨酸辅助制备白炭黑(简称自制白炭黑),通过白炭黑分散液与天然胶乳混合和凝聚共沉,制备白炭黑/天然橡胶(NR)纳米复合材料,研究白炭黑对NR的补强效果。结果表明,与普通白炭黑相比,自制白炭黑具有较好的单分散性,在NR中分布更加均匀,分散程度更高;与普通白炭黑/NR纳米复合材料相比,自制白炭黑/NR纳米复合材料的硫化速率加快,强度性能明显提高,拉伸强度增大13. 6%,撕裂强度增大8. 8%。     

增大白炭黑在工程机械轮胎胎面胶中用量的研究

采用脂肪酸锌皂酯、脂肪酸锌皂和混合酸锌皂3种分散剂,将白炭黑在天然橡胶(NR)和NR/丁苯橡胶(SBR)工程机械轮胎胎面胶中的白炭黑用量增大至25份,考察3种分散剂对胶料性能的影响。结果表明:使用硅烷偶联剂的同时适当添加分散剂,可以增大工程机械轮胎胎面胶中白炭黑用量,提高胶料硫化速度、改善胶料的加工性能和物理性能、明显降低胶料的生热,延长轮胎使用寿命。     

茶多酚对白炭黑/NR复合材料高温疲劳性能的影响

研究了茶多酚对两种不同粒径的白炭黑/天然橡胶(NR)胶料性能(尤其是耐高温动态疲劳性能)的影响,以拓展其在高性能轮胎胶料中的应用。结果表明,茶多酚可以提高白炭黑的分散性,尤其是对低比表面积白炭黑更有效。茶多酚的加入能够提高白炭黑/NR胶料动态疲劳过程中化学结构的稳定性,因此硫化胶的耐动态疲劳性能,尤其是耐高温疲劳性能明显提高。     

白炭黑高效活性分散剂BH68在丁苯橡胶和天然橡胶胶料中的应用研究

采用丁苯橡胶(SBR)胎面胶配方和天然橡胶(NR)胎面胶配方,考察白炭黑高效活性分散剂好优达BH68的性能。结果表明：白炭黑活性剂好优达BH68可以显著降低白炭黑填充SBR胶料和NR胶料的门尼粘度,提高交联密度、定伸应力、撕裂强度和耐磨性能,降低滚动阻力,提高抗湿滑性能;白炭黑活性剂好优达BH68用量为白炭黑用量的6%~10%为宜,与偶联剂Si69共同使用效果更佳。     

白炭黑/石墨烯杂化填料对天然橡胶胶料性能的影响

通过偶联剂KH550改性白炭黑与助分散剂TA修饰石墨烯发生迈克尔加成反应形成强杂化键得到白炭黑/石墨烯杂化填料,研究胶料配方中不同偶联剂KH550用量改性的白炭黑/石墨烯杂化填料在天然橡胶（NR）胶料中的分散性和对NR胶料性能的影响。结果表明,与未使用偶联剂KH550的NR硫化胶相比,用量为2份的偶联剂KH550改性的白炭黑/助分散剂TA修饰的石墨烯杂化填料的NR硫化胶的拉伸强度最大（27.8 MPa）、压缩生热最低、玻璃化温度最低（－37.06 ℃）、热导率最大（在30和150 ℃下的热导率分别为0.168和0.184 W·m-1·K-1）,硫化胶中白炭黑的聚集明显减弱,硫化胶的综合性能最佳。     

Si747原位改性单分散白炭黑补强天然橡胶的性能研究

采用Si747在液相体系中对自制单分散白炭黑表面进行改性,利用乳液共混技术制备了天然橡胶(NR)复合材料,并通过橡胶加工分析、动态力学分析、透射电镜等测试手段对复合材料的结构与性能进行表征。结果表明,与未改性白炭黑相比,改性单分散白炭黑所得胶料的焦烧时间和工艺正硫化时间均缩短,促进了橡胶的硫化;改性单分散白炭黑/NR硫化胶的拉伸、撕裂强度增大,回弹性和耐磨性增加,压缩生热降低;改性前后,大粒径白炭黑复合材料Payne效应均较低;改性小粒径白炭黑抗湿滑性不如改性大粒径白炭黑/NR硫化胶,但滚动阻力表现更优。     

玻璃纤维/NR/BR复合材料的制备及性能研究

采用机械共混法制备玻璃纤维/天然橡胶(NR)/顺丁橡胶(BR)复合材料,研究了玻璃纤维部分替代白炭黑对复合材料硫化特性、力学性能、耐磨性及防滑性能的影响,并与白炭黑、纳米凹土部分替代白炭黑填充胶料的性能进行了对比;结果表明,玻璃纤维的添加能缩短胶料的硫化时间,增加胶料的硬度、撕裂强度和湿摩擦系数,当玻璃纤维用量为6份时,胶料的综合性能高于白炭黑、纳米凹土填充胶料的性能,可考虑将玻璃纤维用于浅色鞋底胶料中,提高胶料的防滑性能。     

离子液体与偶联剂并用对白炭黑填充NR性能的影响

本文用偶联剂Si-69、B-69和离子液体[溴化1-丁基-3-甲基咪唑(BMIM)]单独改性白炭黑,同时用两种偶联剂分别与离子液体BMIM并用改性白炭黑,对比研究了其对NR性能的影响。结果表明,与未改性白炭黑相比,Si-69、B-69和BMIM改性白炭黑后,填充NR的硫化速率加快,Payne效应减弱,力学性能改善,滚动阻力降低;其中,BMIM改性白炭黑填充NR的综合性能最优,其拉伸强度和撕裂强度比未改性白炭黑填充NR提高了一倍。与偶联剂单独改性白炭黑相比,偶联剂与BMIM并用改性白炭黑后,填充NR的t90进一步缩短,填料-橡胶相互作用更强,交联密度更大,力学性能进一步提高,滚动阻力变得更低。     

白炭黑在环氧化天然橡胶中的应用

摘要：研究在不使用任何偶联剂的条件下,白炭黑在环氧化天然橡胶（ENR）中的应用。白炭黑在天然橡胶（NR）中会发生明显的团聚,而在ENR中的团聚情况可得到明显改善,且ENR的环氧化程度越高,白炭黑的分散性越好。ENR白炭黑胶料表现出良好的抗湿滑性能和较低的滚动阻力,白炭黑用量大T20份时,ENR/白炭黑胶料的压缩生热明显低于NR／炭黑胶料。     

不同硫化体系对天然橡胶的动静态性能的影响研究

分别制备了以炭黑和白炭黑为补强填料的不同硫化体系天然橡胶(NR)复合材料,研究硫化体系对NR胶料静态和动态性能的影响。结果表明:普通硫化体系硫化胶具有较高的交联密度、较好的物理性能和优异的耐磨性能;对于白炭黑补强体系,普通硫化体系硫化胶具有最低的滚动阻力;而对于炭黑补强体系,平衡硫化体系硫化胶具有最低的滚动阻力;胶料拉伸强度的增大有利于耐磨性的提高。     

Fatigue resistance of silica‐filled natural rubber vulcanizates: comparative study of the effect of phosphorylated cardanol prepolymer and a silane coupling agent

The fatigue resistance of silica‐filled natural rubber (NR) mixes modified with phosphorylated cardanol prepolymer (PCP) was studied in comparison with similar compositions without PCP and with those containing the same dosage of a silane coupling agent (Si‐69). Considerable improvement in the fatigue resistance was observed for the PCP‐modified NR vulcanizate containing 20 phr of silica compared with the unmodified and Si‐69 modified vulcanizates. In addition, the tear strength of the PCP‐modified NR vulcanizate was higher than that of the others. Atomic force microscopy and the scanning electron microscopy of the vulcanizates showed better dispersion of silica particles in the NR matrix in the presence of PCP than in the unmodified and Si‐69‐modified NR vulcanizates. It is assumed that, at a dosage of 5 phr, PCP functions as a coupling agent between NR and the silica particles thereby improving the filler dispersion and consequently the mechanical properties of the vulcanizate. Copyright © 2005 Society of Chemical Industry     

钴系BR在轮胎胎侧胶中的应用

对比研究炭黑和炭黑/白炭黑填充钴系BR0150/NR与炭黑填充镍系BR9000/NR在轮胎胎侧胶中的应用。结果表明:与炭黑填充BR9000/NR胶料相比,炭黑填充BR0150胶料的门尼粘度较小,流动性较好,正硫化时间和焦烧时间相近,硫化胶的各项性能相差不大;炭黑/白炭黑填充BR0150/NR胶料门尼粘度较大,正硫化时间延长,硫化胶的物理性能和老化性能相差不大,但撕裂强度大幅增大,抗切割性能和耐屈挠割口增长性能改善。     

改性凹土在浅色NR/SBR鞋底胶中的应用

研究改性凹土在浅色天然橡胶（NR）/丁苯橡胶（SBR）鞋底胶中的应用。结果表明：加入改性凹土能增加胶料的塑性,延长焦烧时间,提高操作安全性;与白炭黑填充胶相比,随着改性凹土用量的增加,胶料的拉伸强度先升高后降低,撕裂强度明显增加,而耐磨性、弹性和屈挠性能逐渐变差。老化后胶料的拉伸强度、300%定伸应力及伸长率变化率较小,胶料耐老化性能好于白炭黑填充胶。当改性凹土用量为5份时,胶料的综合性能与白炭黑相差不大,可考虑用改性凹土部分替代白炭黑,在满足制品性能要求的同时,降低生产成本。     

Crack growth of natural rubber filled with functionalized silica particles

In the present work, functionalized liquid isoprene rubber (FLIR) was used to improve the filler dispersion and filler–rubber interaction in the silica filled natural rubber system. By the infrared spectra and scanning electron microscopy, it was proved that the FLIR was successfully grafted on the silica and the functionalized silica was dispersed in the NR matrix homogeneously. Based on the real‐time crack tip morphology monitoring method, the influence of FLIR on the crack growth behavior of NR filled with silica was analyzed. By the adding of FLIR, the crack resistance of the natural rubber embedded with functionalized silica is remarkably increased. When the weight ratio of FLIR to silica is 3:10, the NR composite has the best crack resistance. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 42972.     

A comparison of the properties of rice husk ash,silica, and calcium carbonate filled 75 : 25 NR/EPDM blends

The effects of incorporation of three different fillers, i.e., rice husk ash (RHA), silica, and calcium carbonate (CaCO₃), over a loading range of 0–60 phr on the curing characteristics, processability, mechanical properties, and morphology of 75 : 25 natural rubber (NR)/ethylene‐propylene‐diene monomer (EPDM) blends were studied using a conventional vulcanization system. Filler loading and type influence the processability of the blends in which RHA and CaCO₃ offer better processing advantage over silica. The best improvement in the tensile and tear strength and abrasion resistance of the 75 : 25 NR/EPDM blends with additional fillers was achieved when filled with silica. However, RHA and CaCO₃ were better in resilience property compared to that of silica. The RHA filled blends showed higher failure properties and abrasion resistance but lower ozone resistance than that containing CaCO₃. Scanning electron micrographs revealed that the morphology of the blend filled with silica is finer and more homogenous compared to the blend filled with RHA and CaCO₃. According to these observations, RHA can be used as a cheaper filler to replace CaCO₃ in rubber blends where improved mechanical properties are not so critical. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

黏土/天然橡胶纳米复合材料的制备及性能

利用乳液插层法制备了黏土／天然橡胶纳米复合材料,研究了该复合材料的力学性能、应力应变行为、耐磨性、气体阻隔性和耐老化性能。结果表明,黏土／天然橡胶纳米复合材料与高耐磨炭黑(N330)、白炭黑增强橡胶相比,邵尔A型硬度、定伸应力和撕裂强度较高,拉伸强度相当。黏土、N330以及白炭黑对天然橡胶的拉伸结晶有影响,填料用量对材料拉伸强度的影响存在最佳值。黏土／天然橡胶纳米复合材料具有良好的耐磨性、气体阻隔性和耐老化性能。     

Properties of natural rubber composites reinforced with silica or carbon black: influence of cure accelerator content and filler dispersion

Filler dispersion is a critical factor in determining the properties of filled rubber composites. Silica has a high density of silanol groups on the surface, which lead to strong filler–filler interactions and a poor filler dispersions. A cure accelerator, N‐tert‐butyl‐2‐benzothiazole sulfenamide (TBBS), was found to improve filler dispersion in silica‐filled natural rubber (NR) compounds. For the silica‐filled NR compounds without the silane coupling agent, the reversion ratio generally increased with increase in TBBS content, whereas those of the silica‐filled NR compounds containing the silane coupling agent and carbon black‐filled NR compounds decreased linearly. The tensile strength of the silica‐filled NR vulcanizate without the silane coupling agent increased as the TBBS content increased, whereas carbon black‐filled samples did not show a specific trend. The experimental results were explained by TBBS adsorption on the silica surface and the improvement of silica dispersion with the aid of TBBS. Copyright © 2003 Society of Chemical Industry