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分别以促进剂种类、硫化体系、抗返原助剂、并用和降温的方法讨论了天然橡胶支座硫化返原的情况,优化了各种条件。结果表明,采用半有效体系、促进剂DM、加入Si-69和降温的方法,能较好地解决天然橡胶支座的硫化返原现象。 相似文献
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以橡胶硫化的热传导方程和Rafei硫化动力学模型建立了叠层橡胶隔震支座有限元仿真模型;进行支座硫化热电偶测温试验,其结果验证了建立的有限元模型的正确性,可以用于硫化工艺的制定和优化;对支座是否采用预热处理及是否采用辅助加热等四种硫化方案用建立的有限元模型进行了数值模拟,研究结果表明:对支座进行预热处理比辅助加热更能够提高硫化效率。 相似文献
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在轮胎硫化过程中生产设备和工艺条件存在一定的差异,造成硫化完成后会存在硫化程度不一致的现象,影响了轮胎的质量和寿命。针对此问题本论文提出通过PLC自动控制技术、计算机技术采集、监控、记录轮胎硫化过程参数曲线。利用规一化平均值算法对历史曲线进行分析,形成硫化标准曲线专家知识库。并通过实时监控采集硫化过程中的温度、压力、时间三要素,与专家知识库的标准曲线对比分析,预测最终硫化产品质量,对于偏差超过标准进行报警控制,同时根据偏差程度对硫化工艺时间自动补偿。实验过程及工程实践证明采用此综合解决方案实现了对轮胎硫化过程的智能优化,使轮胎硫化程度的均匀性得到提升,提高轮胎品质。 相似文献
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研究硫化条件和胶料硫化体系对橡胶制品用聚酯线绳强力的影响。结果表明:在硫化温度为150或160 ℃、硫化时间为1~3 h下,干热硫化条件对聚酯线绳强力基本无影响;湿热硫化条件使聚酯纤维有一定程度的水解,造成聚酯线绳强力有所下降,且温度越高、时间越长,强力下降幅度越大,但整体变化不大;湿热硫化条件下,胶料过氧化物硫化体系对聚酯线绳强力影响不大,胶料硫黄硫化体系对聚酯线绳强力有明显不利影响,活性更高的二硫代氨基甲酸盐类促进剂的硫黄硫化体系比秋兰姆类促进剂的硫黄硫化体系的影响更严重。 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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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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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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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