填料-橡胶的化学和物理作用及补强ⅡN330,SiO2,n-SiO2和n-SiO2/KH-846与NR

研究了填料－橡胶的相互作用。发现N330－NR间的相互作用。n－SiO2（粒径：15nm）／KH－846－NR间的相互作用，都是化学作用占优势（＞80％），化学作用对补强的贡献率都大于90％；无偶联剂KH－846时，n－SiO2和SiO2（粒径：15．8nm）与NR都无化学作用，只有物理交联，由于隔离作用，都降低硫化体系与橡胶相互作用的化学交联密度，但n-SiO2的物理交联密度是SiO2的2．6倍，对补强的贡献是SiO2的1．9倍，也是n-SiO2／KH－846体系的61％。     

填料-橡胶间的物理和化学作用Ⅰ.N330,SiO2/KH-846或SiO2/KH-846/N330与NR/BR

用平衡溶胀法和氨平衡溶胀法研究填料-橡胶相互作用,发现N330与NR/BR的相互作用以物理键为主,SiO2/KH-846或SiO2/KH-846/N330与NR/BR的相互作用以化学键为主(大于70%)。但是,3种填料对橡胶的增强作用(拉伸强度)的贡献率都是化学键的贡献率(大于80%)大于物理键的(小于20%)。     

填充剂与NR/BR相互作用研究

利用氨离解物理吸附键的方法，研究了炭黑、白炭黑／偶联剂及炭黑／偶联剂／白炭黑与NR／BR的相互作用及其对硫化胶性能的影响。结果表明：橡胶－炭黑相互作用中共价键占40％，物理作用占优势，橡胶－偶联剂－白炭黑相互作用中共价键占66％；橡胶－偶联剂－白炭黑－炭黑相互作用中共价键占71％－73％，大于白炭黑或炭黑单用的情况。     

补强体系对NR硫化胶疲劳破坏特性的影响

用断裂力学方法研究炭黑N330、炭黑N330/白炭黑和白炭黑补强NR硫化胶的疲劳破坏特性.结果表明,与炭黑N330和炭黑N330/白炭黑补强的NR硫化胶相比,白炭黑补强的NR硫化胶疲劳寿命较长,内部潜在缺陷较少,抗裂纹扩展性能较好;随着疲劳时间的延长,NR硫化胶拉断时的应变能密度减小;疲劳寿命方程能够快速、准确地预测NR硫化胶的疲劳寿命.     

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。     

高岭土在橡胶中的应用性能研究

研究高岭土与炭黑N660、沉淀法白炭黑对天然橡胶(NR)补强性能的差异,并考察高岭土部分替代炭黑N660在子午线轮胎气密层胶中的应用。结果表明,高岭土对NR的补强作用优于未加偶联剂的沉淀法白炭黑,接近炭黑N660,其中改性高岭土对NR的补强效果优于普通高岭土;采用少量高岭土尤其是改性高岭土等量部分替代炭黑N660,气密层胶料拉伸强度提高,加工性能和其他物理性能变化不大。在橡胶配方中用高岭土部分替代炭黑具有可行性,可降低原材料成本,同时节能降耗。     

馆藏文献通报

2005061—炭黑的现状与发展趋势，2005062—炭黑N330表面固相接枝DBM的研究，2005063—新的炭黑补强理论，2005064—白炭黑／偶联剂补强橡胶的性能研究，2005065—沉淀法白炭黑的合成工艺研究。     

星型嵌段结构集成橡胶在高性能轮胎胎面胶中的应用及性能研究

研究了炭黑和炭黑/白炭黑两种补强填充体系对集成橡胶(SIBR)/天然橡胶(NR)、SIBR/顺丁橡胶(BR)及SIBR/NR/BR胶料性能的影响。结果表明,共混比为70/30的SIBR/NR体系的综合性能最好,具有较好的拉伸性能和抗湿滑性能;炭黑/白炭黑补强体系的性能优于全炭黑补强体系,具有较高的物理机械性能,较好的耐屈挠、耐刺扎和低生热性能,其低滚动阻力性能与高抗湿滑性能之间具有良好的平衡。     

炭黑及白炭黑对AEM补强的研究

研究了炭黑及白炭黑对胺类硫化体系硫化的AEM橡胶的补强作用,并探讨了炭黑和白炭黑种类及用量对AEM硫化胶力学性能的影响.结果表明,炭黑用量为40份时,拉伸强度和撕裂强度均最佳;炭黑N330,N550,N660和N774对AEM的补强作用分别为具有较好力学强度、较好压缩永久变形、较好力学性能均衡性和较差补强效果;白炭黑对AEM的补强效果较好.     

填料与橡胶的化学和物理作用及其对橡胶的补强ⅢAl2O3、n-Al2O3和n-Al2O3/NDZ-101与NR

研究了Al2O3与NR的相互作用。发现Al2O3与NR相互作用的物理交联密度与其吸油值和比表面积呈正相关性，与其粒径和pH值呈负相关性，与其吸油值的相关性最大。Al2O3对硫化体系与NR的化学相互作用有屏蔽效应，使化学交联密度下降。其屏蔽效应与其比表面积和吸油值呈负相关性，与其粒径和pH值呈正相关性。Al2O3的粒径为4μm时对NR无补强作用，粒径为1μm时稍有补强作用，粒径小于25nm时补强作用很大，全部是物理健的贡献，添加偶联剂，强度只增加8．9％，但是，化学相互作用的贡献达89．8％，化学交联占总交联密度的77．5％。     

白炭黑表面改性对NR/BR硫化胶性能的影响

研究了10种偶联剂和3种表面活性剂改性白炭黑后对NR/BR硫化胶性能的影响.试验结果表明,不同表面改性剂改性白炭黑后对NR/BR硫化胶物理性能的影响程度大小顺序为硅烷类偶联剂＞钛酸酯类偶联剂＞表面活性剂.其中硅烷类偶联剂的改性效果优劣顺序为KH-550＞KH-846＞KH-590＞KH-560,带胺基和磷酸酯基团的偶联剂具有较好的抗老化作用;钛酸酯类偶联剂的改性效果优劣顺序为NDZ-311w＞NDZ-102＞NDZ-201＞NDZ-311＞NDZ-401＞NDZ-101;表面活性剂的改性效果优劣顺序为ATAC＞T-40＞ABS.     

硅烷偶联剂对白炭黑填充溴化丁基橡胶/天然橡胶并用胶性能的影响

试验研究硅烷偶联剂Si69,Si75和KH560对白炭黑填充溴化丁基橡胶(BIIR)/天然橡胶(NR)并用胶性能的影响。结果表明:随着硅烷偶联剂Si75或KH560用量的增大,胶料的挤出膨胀率呈增大趋势,门尼粘度和F;减小,Payne效应减弱,定伸应力和拉伸强度呈增大趋势,拉断伸长率和撕裂强度呈减小趋势,加工性能和老化后耐屈挠性能改善;硅烷偶联剂Si75和KH560能够明显改善白炭黑填充BIIR/NR并用胶的加工性能和老化后的耐屈挠性能。     

Silica‐modified SBR/BR blends

The purpose of this article is that the silica‐modified SBR/BR blend replaces natural rubber (NR) in some application fields. The styrene‐butadiene rubber (SBR) and cis‐butadiene rubber (BR) blend was modified, in which silica filler was treated with the r‐Aminopropyltriethoxysilane (KH‐550) as a coupling agent, to improve mechanical and thermal properties, and compatibilities. The optimum formula and cure condition were determined by testing the properties of SBR/BR blend. The properties of NR and the silica‐modified SBR/BR blend were compared. The results show that the optimum formulawas 80/20 SBR/BR, 2.5 phr dicumyl peroxide (DCP), 45 phr silica and 2.5 mL KH‐550. The best cure condition was at 150°C for 25 min under 10 MPa. The mechanical and thermal properties of SBR/BR blend were obviously modified, in which the silica filler treated with KH‐550. The compatibility of SBR/BR blend with DCP was better than those with benzoyl peroxide (BPO) and DCP/BPO. The crosslinking bonds between modified silica and rubbers were proved by Fourier transform infrared analysis, and the compatibility of SBR and BR was proved by polarized light microscopy (PLM) analysis. The silica‐modified SBR/BR blend can substitute for NR in the specific application fields. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.     

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     

偶联剂Si 69对NR/BR/NBR共混硫化胶性能的影响

研究了偶联剂Si 69对NR／BR／NBR共混胶体系的硫化特性、交联密度和硫化胶的物理机械性能及动态力学性能的影响。结果表明，偶联剂Si 69在共混硫化胶中可以起到提高聚合物与填料间的相互作用和交联密度的作用，它在白炭黑增强硫化胶中对性能的改善比在炭黑增强硫化胶中的改善更显著。     

Novel organomodified kaolin/silica hybrid fillers in natural rubber and its blend with polybutadiene rubber

Phosphorylated cashew nut shell liquid prepolymer (PCNSL) was used as an organomodifier for kaolin and the role of the PCNSL-modified kaolin as a reinforcing nanofiller in natural rubber (NR) and its blends with polybutadiene rubber (BR) was studied. The organomodified kaolin was characterized using thermogravimetric analysis, powder X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy and scanning electron microscopy. It was found that PCNSL could act as a coupling agent and compatibilizer between kaolin and rubber. Improved physico-mechanical properties were observed at a dosage of 6 phr of the modified kaolin in NR. Blends of NR with BR containing precipitated silica/PCNSL-modified kaolin hybrid filler showed improved tensile properties, tear strength and flex fatigue resistance along with lower heat build-up which could be beneficial for applications such as automobile tire sidewall.     

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。     

纳米碳酸钙的特点与应用

根据纳米碳酸钙的特点及填充补强机理,将白燕华ＣＣ填充于ＮＲ,ＳＢＲ及ＢＲ胶料中,测试其补强填充效果。结果表明,随白燕华ＣＣ用量的增大,ＢＲ和ＳＢＲ胶料的拉伸强度明显上升,而ＮＲ胶料则表现为先缓慢上升,在白燕华ＣＣ用量大于６０份后明显下降;ＳＢＲ和ＢＲ胶料的撕裂强度则不如ＮＲ胶料增长显著。在ＳＢＲ和ＢＲ胶料中随白燕华ＣＣ用量的增大,硫化时间明显缩短。纳米碳酸钙可部分或大部分替代炭黑和白炭黑作补强填料,具有填充量大,补强、增白效果好等特点,适宜在浅色橡胶制品中应用。     

环氧树脂增强天然橡胶/顺丁橡胶并用胶的性能

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。