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航空轮胎骨架材料及其发展 总被引:1,自引:1,他引:0
概述航空轮胎的使用特点和要求,重点介绍航空轮胎骨架材料的作用、要求及发展,指出航空轮胎的发展方向是子午化、芳纶化.目前航空轮胎骨架材料普遍采用锦纶 66 帘线,但芳纶/锦纶复合帘线兼具高模量、高强度、高热稳定性、质量小、弹性好、吸湿率低、抗冲击强度高和耐疲劳性能好等优点,将成为航空轮胎主要骨架材料之一. 相似文献
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概述芳纶复合帘线的加工、粘合机理以及在轮胎中的应用。直捻机经过改进可用于芳纶复合帘线加工;芳纶表面改性、超声波处理、γ射线辐射和二次浸渍工艺等均可提高芳纶帘线的粘合性能;将芳纶复合帘线用于子午线轮胎带束层和冠带层、工程机械轮胎缓冲层等,可减小轮胎质量,提高抗刺扎性能,延长使用寿命。 相似文献
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以试验结果为依据,简要介绍了芳纶帘线的基本性能和特点,与现有尼龙66航空轮胎帘线相比在粘合强度方面存在的差距,对比试验了配合因素对粘合强度的影响,成品试制试验中取得了初步进展,试验结果表明,芳纶帘线不但有可能广泛用于高速航空轮胎,而且具有较好的社会效益和综合经济效益。 相似文献
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试验研究采用锦纶帘线、芳纶帘线以及芳纶与锦纶复合帘线作胎体帘布层或带束层骨架材料对轮胎接地印痕的影响。结果表明:采用相同帘线作胎体帘布层骨架材料、不同帘线作带束层骨架材料时,带束层帘线刚性越大,轮胎接地印痕长轴冠中长度越小,短轴长度越大,矩形率越大;采用锦纶帘线作胎体帘布层和带束层骨架材料的轮胎接地印痕形状与采用复合帘线作胎体帘布层和带束层骨架材料的轮胎相似;使用相同原材料(除骨架材料外)、采用相同工艺和模具硫化的轮胎,在相同充气压力、负荷和下沉量下,接地印痕面积比较接近。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献
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