共查询到20条相似文献,搜索用时 78 毫秒
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1 .概述白炭黑作为最重要的橡胶补强剂之一 ,其应用范围越来越广泛 ,从大范围上分 ,白炭黑分为气相法白炭黑和沉淀白炭黑。其两者之间的根本区别就在于气相白炭黑的内部结构是稳定的无定形硅酸 ,结构中的 -Si-单元氧化成三维结构 ,分子间排列较为紧密 ,且气相白炭黑是SiCl4高温水解而成 ,故其成品含水率低于 1 %而沉淀白炭黑的粒子结构由于在水介质中进行反应除生成三维结构外 ,还残存有二维结构 ,且分子间排列较松疏 ,形成结构内部毛细管 ,故其含水率较高 ,一般为 4-8% ,且沉淀白炭黑的返潮率特快 ,有实验证明 ,把沉淀白炭黑水从烘干… 相似文献
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采用两步工艺法制备具有二次微粒结构的白炭黑.并对其性能进行研究.结果表明,这种结构白炭黑为无定形结构,热稳定性较好;与传统白炭黑相比,本研制结构白炭黑比表面积较大、内结构较高、分散性较好、平均粒径及聚集体尺寸较小. 相似文献
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本文从沉淀法白炭黑粒子组成与结构、白炭黑补强作用机理等诸方面,阐述了沉淀法白炭黑理化指标对橡胶胶料性能的影响。 相似文献
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以硫酸和水玻璃为原料,采用液相沉淀法制备了白炭黑,然后用硅烷偶联剂KH 570对白炭黑进行湿法改性,再用改性白炭黑增强丁苯橡胶(SBR),研究了改性白炭黑的最佳工艺条件,表征了改性白炭黑的微观结构,并考察了改性白炭黑对SBR加工性能和拉伸性能的影响。结果表明,在反应温度为85℃、反应液pH值为4.5、KH 570质量分数为2.0%的条件下,可制得无定型非晶体结构、分散性较好的疏水性白炭黑,其吸油值和亲油化度可分别达到2.25 mL/g、10.12%;KH 570改性白炭黑可改善SBR的加工性能和拉伸性能,KH 570的最佳质量分数为2.0%。 相似文献
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A tire thread formulation for heavy‐duty trucks containing SBR/BR rubber blend and varying proportions of silica/clay fillers including a silane‐coupling agent have been investigated. The various mixes were compounded in a Banbury ‘O’ mixer and vulcanized using the EV‐system. Silica/clay (80/0) served as the control mix. The oscillating disc rheometer (ODR) was used in determination of cure characteristics. Substitution of silica (80 phr) with china clay up to 40 phr increased the cure rate of the rubber blend mixes as well as their maximum torque level (Tmax). Tmax was observed to be highest at a filler blend ratio of 40/40 phr. Synergism between silica and clay at this filler blend mixture is suggested to be responsible for the observation. The heat buildup was reduced from 43 to 20°C as the clay content increased. Results also showed that the rubber blend compound containing silica/clay (60/20) filler blend in the stated ratio exhibited the best balance of properties in the critical parameters such as the absolute torque level (69.5 dNm), heat buildup (39°C), and abrasion resistance (0.574 mg.loss/1,000 rev). The rate of depreciation of abrasion resistance of rubber blend compound as the clay content increased was found to be 0.035 mg loss/1,000 rev as silica is substituted with one part of china clay phr. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 1024–1028, 2004 相似文献
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试验研究Newsil-175GR造粒白炭黑在载重斜交轮胎胎面胶中的应用。结果表明,采用Newsil-175GR造粒白炭黑等量替代955#粉体白炭黑,胶料硫化速度有加快趋势,拉伸强度和撕裂强度稍有提高,耐磨性能变化不大,加工性能良好,成品轮胎耐久性能符合国家标准要求。 相似文献
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Sanjay Bhattacharyya Vivekanda Lodha Saikat Dasgupta Rabindra Mukhopadhyay Abhilash Guha Preetom Sarkar Tuhin Saha Anil K. Bhowmick 《应用聚合物科学杂志》2019,136(18):47560
Rubber industry is facing a stiff challenge in the years to come. There are rising price for fossil fuel and shortage of resources. There is more stringent legislation to protect the environment and reduce the emission. Filler plays an important role in imparting useful properties to rubber products. In this article, the effects of new generation filler, on the physical properties, tearing energy, and abrasion resistance were investigated. The new generation filler, highly dispersible silica, has a dibutyl phthalate (DBP) absorption value of more than 180cc 100 g−1, more branched structure and relatively higher amount of small aggregates. Four different loadings of silica (up to 45 phr) were investigated. With increasing filler loading, the tensile strength and modulus at 300% elongation increased and the elongation-at-break decreased. The rebound resilience decreased and tan delta value improved with increasing silica content. The abradability continuously decreased with concomitant increase in the side coefficient force. The fatigue resistance was found to be better at higher silica loading. The silica particles due to its surface structure helps in crack arresting. The abradibility was related to tearing energy, loss modulus, and breaking energy. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47560. 相似文献
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研究了硅烷偶联剂在填充白炭黑斜交轮胎胎面胶中的应用,试验结果表明,在填充白炭黑的胎面胶中加入偶联剂Si69,可以降低胶料的粘度,缩短焦烧时间和正硫化时间,增大硫化胶的邵尔A型硬度和300%定伸应力;采用三段混炼可以改善胶料的挤出工艺性能和胎面挤出尺寸稳定性。 相似文献