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分析胎体帘布接头附近、不固定位置及固定位置钢丝帘线间距不均匀的原因,并提出相应的解决措施。采取控制胶料门尼粘度、改进压延工艺、提高过程控制等相应解决措施后,胎体帘布钢丝帘线分布不均匀占不合格品的比例由之前的10.5%下降到6.2%,从而使成品轮胎合格率及产品质量得到大大提高。 相似文献
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研究胎体采用聚酯帘布和钢丝帘线对轿车子午线轮胎性能的影响,探讨轿车子午线轮胎胎体采用钢丝帘线的优缺点。结果表明:与聚酯帘布轮胎相比,钢丝帘线轮胎强度性能、高速性能和低气压耐久性能提高;硬度因数减小,在相同轮胎质量下滚动阻力更低;横向刚性和纵向刚性均减小,驾乘舒适性更好;接地印痕面积更大,单位面积平均压力更小,轮胎的耐磨性能更好,制动性能更佳;在充气压力增大至350 kPa时,负荷性能更好,更有利于安全驾驶;采用1层钢丝帘布替代2层聚酯帘布可以降低成本。目前,轿车轮胎胎体骨架材料采用钢丝帘线仍存在许多问题需要解决。 相似文献
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分析全钢子午线轮胎生产过程中胎体帘布稀线产生的原因,并提出对策。胎体帘布产生稀线的主要原因:成型时轮胎胶部件接头不合要求、帘布接头异常、胎坯存放过程中变形、帘布压延过程中钢丝张力和压力设置不当以及边部轻微脱层、帘布成型过程中拉伸。通过采取严格控制成型时轮胎胶部件接头质量、设定合理的接头机压力、调整压延机辊筒间压力和钢丝张力、保证帘布压延时供胶连续和均匀、避免成型时帘布拉伸等措施,有效解决了胎体帘布稀线问题。 相似文献
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研究3+9+15×0.225ST钢丝帘线在全钢工程机械轮胎中的应用。结果表明:与3+9+15×0.225HT钢丝帘线相比,3+9+15×0.225ST钢丝帘线捻向、捻距、帘线直径、线密度和粘合力基本一致,破断力明显提高,钢丝帘线渗胶性能更好,以其替代3+9+15×0.225HT钢丝帘线用于全钢工程机械轮胎胎体,工艺性能良好,帘布质量减小;与7×7×0.22+0.15HT钢丝帘线相比,3+9+15×0.225ST钢丝帘线单位直径破断力和单位线密度破断力提高,钢丝帘线渗胶性能更好,以其替代7×7×0.22+0.15HT钢丝帘线用于全钢工程机械轮胎带束层,压延和成型工艺性能良好。在部分小规格全钢工程机械轮胎的胎体和带束层中使用3+9+15×0.225ST钢丝帘线后,轮胎承载能力满足要求,轮胎耐久性能提升,同时由于减小了帘布压延厚度和质量可以节约生产成本。 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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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
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Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method1 was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity. 相似文献