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正经过2年的研究,特拓(青岛)轮胎技术有限公司日前正式推出VMA胶料流动性分析仪,见图1。我国橡胶工业长期以来使用门尼粘度仪检测胶料生产过程中的加工性能,但对胶料的流动性表征不直观。VMA胶料流动性分析仪填补了我国胶料流动性检测设备的空白。VMA胶料流动性分析仪可用于轮胎、胶囊和胶鞋等行业,其主要特点有:(1)适用于母炼胶和终炼胶;(2)在高剪切速率下能准确检测胶料流动性,更真实地反映胶料实际生产过 相似文献
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本研究的目的是确定影响轮胎胶料流变特性以及其加工性能参数。流变特性在宽范围剪切速率下测定。规定加工性能与MPT毛细管流变仪挤出物的表面粗糙成反比。根据挤出物表面轮廓的图像分析测量表面粗糙度。发现挤出物表面粗糙度与门尼峰值(在起始流动试验剪切速率很低的情况下表观门尼粘度随时间变化曲线的峰值)密切相关。门尼峰值可以表示为屈服应力。研究了存放时间和温度对门尼峰值的影响。发现加工性能降低动力学并不遵循阿累尼乌斯规律。最后提出了表征填料-橡胶形态结构的描述性能物理模型。 相似文献
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Schaal S Coran A Y 《轮胎工业》2002,22(4):245-252
本研究的目的是确定影响轮胎胶料流变特性以及其加工性能参数.流变特性在宽范围剪切速率下测定.规定加工性能与MPT毛细管流变仪挤出物的表面粗糙度成反比.根据挤出物表面轮廓的图像分析测量表面粗糙度.发现挤出物表面粗糙度与门尼峰值(在起始流动试验剪切速率很低的情况下表观门尼粘度随时间变化曲线的峰值)密切相关.门尼峰值可以表示为屈服应力.研究了存放时间和温度对门尼峰值的影响.发现加工性能降低动力学并不遵循阿累尼乌斯规律.最后提出了表征填料-橡胶形态结构的描述性物理模型. 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 miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 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