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本文提出通过确定胶料混炼过程参数来预测混炼胶粘度质量指标(门尼粘度)的三种软测量的方法,通过主元分析法,确定混炼胶质量指标(门尼粘度)的软测量的辅助变量,并且比较了它们的软测量数据,指出基于神经网络的软测量技术优于其它两种软测量方法。 相似文献
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介绍支持向量机(SVM)的原理,并试验研究密炼过程中应用SVM模型对混炼胶质量进行预测。结果表明,SVM预测模型所得结果与回归分析法模型的预测结果接近,且具有更强的泛化能力;其预测误差控制在门尼粘度均值的3%以内。 相似文献
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混炼胶门尼粘度的预测 总被引:2,自引:0,他引:2
使用微机控制系统,采集混炼过程的功率、填充系数等参数,建立数学模型,实现了对混炼胶粘度的预测。其预测结果与实测值比较平均差为1.36个门尼值,预测值和实测值之间的平均相对误差为2.36%,此外经过检验,证实笔者所建的预测模型是较稳定的,因此具有实用价值。 相似文献
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根据流变基础原理研究橡胶混炼过程中粘度与功率的关系,建立了混炼过程转子剪切功率与胶料粘度关系的数学模型。与试验结果对比表明,数学模型中提出的粘度比可以较好地描述混炼过程粘度的变化规律。根据此数学模型,可建立合理的粘度跟踪体系,从而更好地控制混炼胶的质量。 相似文献
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Debi P. Mukherjee 《Polymer Engineering and Science》1977,17(11):788-792
The dynamic shear properties of a natural rubber and several commercial synthetic polyisoprenes were measured in a Rheometrics mechanical spectrometer. The dynamic viscosity vs angular velocity curve was fitted to the three-constant Car, reau model. The rheological parameters were correlated with molecular characteristics such as gel content and weight average molecular weight. The viscosity measurements at high shear rate were obtained from capillary rheometry. The viscosity vs shear rate curve at the low shear rate end was found to be superimposible on the plot of dynamic shear viscosity vs twice the angular velocity. 相似文献
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During the production of high impact polystyrene the rubber particle formation process is very important to control the final physical property balance. Besides the rubber viscosity, the presence of a copolymer to reduce the interfacial tension between the rubber and polystyrene phase is central. Such a copolymer can be added or can be made during the polymerization. In this study, it was attempted to create a block rubber in situ using ultrasound. Polybutadiene dissolved in styrene has been sonicated to create macroradicals. It was anticipated that these macroradicals would initiate the polymerization of styrene thus generating a poly(butadiene‐block‐styrene) acting as emulsifier during the production of high impact polystyrene. No evidence was found for the formation of a block copolymer but the higher reactivity and the resulting rubber particles indicate that besides rubber molecular weight reduction extra functionality was introduced on the rubber. No attempts were made to define the nature of the functionality. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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丁二烯溶液聚合过程是将溶剂中的丁二烯在催化剂作用下引发聚合得到顺式1,4-含量在96%-98%的聚丁二烯胶液的工艺过程。聚合过程是整个橡胶生产中最关键的步骤,聚合反应的好坏直接影响到成品质量,通过对聚合进料量、单体浓度、反应温度、催化剂用量及配比、转化率、聚合物门尼粘度等项目的控制达到稳定聚合反应,优化产品质量的目的。 相似文献
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GBW(E)130397经过国家质量监督检验检疫总局的批准后,在合成橡胶行业校准门尼粘度计、生产控制、人员考核、产品检验、产品贸易、质量仲裁等方面发挥了重要的作用,得到了广泛的应用。研制出的第1批门尼黏度国家标准物质GBW(E)130397的量预计2013年年底将使用完,为满足合成橡胶行业对门尼黏度标准物质的需求,国家合成橡胶质量监督检验中心组织复制门尼黏度标准物质。经过样品候选、均匀性检验、稳定性检验、定值、不确定度评估等工作,GBW(E)130397标准物质被成功复制。门尼黏度标准物质定值结果在0.05的显著水平时,数据间无异常值、呈现正态分布、各组数据间处于等精度。因此,定值结果的总平均值ML(1+4)100℃(45.2±0.5)则为门尼黏度标准物质的标称值。 相似文献
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端乙烯基硅油对RTV-2泡沫硅橡胶性能的影响 总被引:1,自引:0,他引:1
以α,ω-二羟基聚二甲基硅氧烷(107硅橡胶)、α,ω-二乙烯基聚二甲基硅氧烷(端乙烯基硅油)、含氢硅油、气相法白炭黑、抑制剂、发泡剂及催化剂为原料,制得双组分室温硫化(RTV-2)泡沫硅橡胶。探讨了端乙烯基硅油黏度和用量对RTV-2泡沫硅橡胶的初始黏度、操作时间、发泡倍率、力学性能、硬度及外观形貌的影响。结果表明,随着端乙烯基硅油黏度的增加,RTV-2泡沫硅橡胶的发泡倍率增加,泡孔孔径及骨架变细,弹性更好,胶料的初始黏度增加、操作时间缩短、硬度增加、泡孔孔径逐渐变小,拉伸强度先降后增,伸长率变化不明显;且随着端乙烯基硅油用量的增加,RTV-2泡沫硅橡胶的发泡倍率减小,泡孔孔径及骨架会先细后粗。当加入3~9份8 000 mPa·s的端乙烯基硅油时,可制得流动性好,操作时间长、发泡倍率高、泡孔孔径细及弹性好的泡沫硅橡胶。 相似文献
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为了明确制备方法和工艺条件对橡胶沥青黏度特性的影响,在不同制备温度、制备时间、胶粉粒径及胶粉掺量条件下,采用高速剪切和机械搅拌两种方式制备橡胶沥青,对比分析了两种制备体系橡胶沥青黏度变化规律及黏度构成差异。采用Arrhenius方程计算了两种体系橡胶沥青的黏流活化能(Eη),探究了其黏流特性的差异及温度敏感性。结果表明:两种制备体系的橡胶沥青黏度随制备温度、制备时间的增加及胶粉粒径的减小先增大后减小,在135 ℃、150 ℃以及165 ℃测试条件下,剪切橡胶沥青的黏度大于搅拌体系,而在180 ℃条件下呈现出相反规律;随胶粉掺量的增加,二者的黏度不断增大,且搅拌体系的黏度始终大于剪切体系。剪切体系的Eη大于搅拌体系,表明剪切体系橡胶沥青的黏度主要源于胶粉和沥青的交互作用,温度敏感性更强,而搅拌橡胶沥青的黏度主要来自胶粉的位阻效应,自身稳定性更好。 相似文献
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GBW(E)130398自2012年国家质量监督检验检疫总局批准后,在合成橡胶行业校准门尼粘度计、生产控制、人员考核、产品检验、产品贸易、质量仲裁等方面发挥了重要的作用,得到了广泛的应用。研制的该批门尼黏度国家标准物质GBW(E)130398的量预计2013年年底将使用完,为满足合成橡胶行业对门尼黏度标准物质的需求,国家合成橡胶质量监督检验中心组织复制门尼黏度标准物质。经过样品候选、均匀性检验、稳定性检验、定值、不确定度评估等工作,GBW(E)130398标准物质被成功复制。门尼黏度标准物质定值结果在0.01的显著水平时,数据无异常值、呈现正态分布、各组数据间处于等精度。因此,定值结果的总平均值ML(1+4)100℃(49.8±0.8)则为门尼黏度标准物质的标称值。 相似文献
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Rubber-reinforced polystyrenes were prepared by graft copolymerization using various butadiene polymers and copolymers. Electron microscopy showed that variations in the pre-polymerization temperature, composition of the rubber, and molecular weight of the rubber influenced the size and structure of the dispersed rubber particles. Microstructures and impact strengths comparable to those of commercial materials were obtained from a limited range of conditions. Solution styrene-butadiene copolymers and a polybutadiene of low molecular weight gave unusual microstructures although polystyrenes of inferior impact strength were obtained. A particle size of 2 μm or greater was required to obtain reasonable improvements in impact strength. The particle size increased with an increase in the initial viscosity of the rubber in styrene solution provided that rubber type and concentration, and pre-polymerization temperature were constant. The effects of these three variables on particle size could not be related to viscosity changes. 相似文献