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在全钢载重子午线轮胎生产过程中,影响轮胎质量的因素很多,过渡层与气密层复合产生气泡问题一直是影响轮胎性能的难题,随着加工工艺和胶料配方的改进,气泡现象也更加突出.通过试验分析,设计了一套可行的装置,有效解决了内衬层的气泡问题. 相似文献
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采用溴化丁基(BIIR)和聚酰胺(PA)为主要原材料,通过动态硫化技术制备了BIIR/ PA热塑性弹性体(TPV),TEM和AFM测试结果显示TPV分散相BIIR的粒径在0.5至5μm之间。采取挤出吹膜方法试制成功了TPV薄膜,测定分析了TPV薄膜的阻隔性能、拉伸性能、伸张疲劳性能及耐热空气老化性能,结果表明其各项性能优良,阻隔性能突出,特别适合用于轮胎气密层和要求高阻隔性的软管等的生产。。进行了薄膜用于轮胎气密层的应用研究,制备了TPV薄膜与过渡层的复合胶片,利用该复合胶片作为气密层部件进行轮胎试制,解决了TPV薄膜与胎体复合时存气、皱褶的工艺难题。试制的轮胎通过GB/T 4502-2016标准中的高速性能、耐久性和低气压性能等,轮胎减重5%以上。 相似文献
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Walter H.Waddell 《轮胎工业》2007,27(6):329-339
研究气密层胶中BⅡR用量对气密层胶性能和轮胎充气压力保持率的影响,及充气压力保持率与轮胎老化和耐久性能的关系.结果表明,随着BⅡR用量的增大,气密层胶的空气和湿气渗透性明显降低,强伸性能变化不大,轮胎充气压力保持率提高;充气压力保持率与轮胎的耐久性能,胎肩垫胶和带束层胶的粘合强度、固定氧质量和模量变化率及热空气老化和低气压试验后胎面总裂纹面积的相关性显著;充气压力保持率最大的轮胎,其部件能够得到最好的保护,不易出现老化变硬现象,带束层边缘不易出现破坏,耐久性能最好. 相似文献
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研究氯化丁基再生橡胶在摩托车轮胎气密层胶中的应用。结果表明,添加氯化丁基再生橡胶的硫化胶的拉伸强度、拉断伸长率和撕裂强度等性能无明显变化,并稍好于原配方硫化胶,完全可满足摩托车轮胎气密层胶的性能要求。用添加氯化丁基再生橡胶气密层胶生产的无内胎摩托车轮胎气密性良好,其高速性能和耐久性能均符合国家标准要求,并且可获得可观的经济效益。 相似文献
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苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况,合成乙苯,苯乙烯所用的催化剂种类,并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。 相似文献
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Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile
Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, 13C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc. 相似文献
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G. R. Hamed 《The Journal of Adhesion》1983,16(1):31-39
A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength. 相似文献
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The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu3Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu3Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters. 相似文献
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责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体. 相似文献