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研究生物凝固天然橡胶(NR-B)在子午线轮胎中的应用,并与马来西亚20#标准胶(SMR20)进行对比。结果表明:与SMR20相比,NR-B的塑性初值和塑性保持率较高,纯胶配方硫化胶拉伸强度较大,定伸应力较小;采用NR-B的胎面胶、基部胶、胎肩垫胶和粘合胶拉伸强度、拉断伸长率和撕裂强度等关键性能均与采用SMR20的硫化胶相当,但采用NR-B的胶料普遍存在ML偏高的现象。成品轮胎性能测试结果表明,采用NR-B的轮胎高速性能和耐久性能与采用SMR20的轮胎相当,耐磨性能差别不大。 相似文献
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研究生物凝固天然橡胶(NR-B)的性能及其在子午线轮胎中的应用,并与马来西亚20~#天然橡胶(SMR20)进行对比。基本性能试验结果表明,与SMR20相比,NR-B的塑性初值和塑性保持率较高,混炼胶的焦烧性能较好,硫化速率较快,硫化胶的定伸应力较小,拉伸强度较大。小配合试验结果表明,与SMR20相比,NR-B配方胶料的拉伸强度、拉断伸长率、撕裂强度和抽出力较大,耐磨性能和耐热空气老化性能较好,但门尼粘度较大,加工性能略差。NR-B可以替代SMR20应用于子午线轮胎生产,但在生产过程中需对其工艺进行适当调整。 相似文献
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(续上期)马来西亚:马来西亚是世界第三大天然橡胶出口国,2005年干胶的净出口量为66万t,占世界天然橡胶出口总量的10·5%。比1999年的43·6万的出口量增加了22·4万t,增长51·4%,年均增长8·6%,是世界天然橡胶出口增加较快的国家。在马来西亚出口的天然橡胶中,标准胶占88%(主要是SMR20和SMR10),乳胶占12%。出口目的国主要有,中国、德国、美国、韩国、伊朗、法国、巴西、意大利、土耳其、英国、西班牙、新加坡、加拿大等。目前马来西亚是中国第二大天然橡胶供应国。越南:越南是世界上第四大天然橡胶出口国,2005年的出口量为37·1万t,占世界… 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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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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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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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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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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利用组件技术开发化工原理实验课件,给出了系统层、组件库层和应用层的架构划分。重点讨论了组件库的设计,给出了流体阻力这一典型实验的实现描述。实践证实,基于组件技术可以提高仿真实验的开发效率。 相似文献