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441.Cam转子密炼机混沌混合特性影响因素分析
[橡胶和塑料制品业] [2015-04-26]
建立了Cam转子密炼机二维流动有限元模型,采用网格重叠技术,对密炼机瞬态混炼流场进行了数值模拟。在此基础上,结合Poincaré截面、平均对数线拉伸、Lyapunov指数等参数对混沌混合进行定性及定量表征;研究了转子中心距、初始相位角及转速等因素对Cam转子密炼机流体混沌混合强度的影响。结果表明,转子中心距、初始相位角及转速等因素直接影响混炼流场的混沌混合强度;增大转子中心距、改变初始相位角、提高转速等方法可强化混炼过程的混沌混合,提高流体的混合效率。
关键词：Cam转子密炼机；混沌混合；Poincaré截面；Lyapunov指数
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442.基于CAE技术的眼镜支架注塑模的模具设计及成型分析
[橡胶和塑料制品业] [2015-04-26]
分析了带有嵌件的眼镜支架的结构及成型工艺特点,设计了对应的注塑模模具,并利用CAE技术的塑料注射成型软件Moldflow对制件进行了预成型。制件注射过程中气穴较少、纤维取向内外层基本一致,制件性能稳定;缩痕指数表明制件的冷却相对均衡、残余应力较小。综合分析结果表明,塑件成型质量较好,一模四件的对称性分布模具结构简单合理,可行性好。
关键词：注塑模；嵌件；模具设计；CAE技术
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443.基于Kriging代理模型的注塑件残余应力优化分析
[橡胶和塑料制品业] [2015-04-26]
以注塑成型制品中脱模后的最大Mises-Hencky残余应力为目标函数,运用基于Kriging代理模型及EI加点准则的序列优化方法,对聚碳酸酯材料制品进行了工艺参数(包括熔体温度、模具温度、注射速率、保压压力及保压时间)优化。算例结果表明,所提出方法可以有效地降低注塑件内的最大Mises-Hencky残余应力。在此基础上对充填阶段进行深入分析,用贝塞尔曲线控制方式代替常规的常速率充填控制方式,进一步降低了制件内的残余应力。
关键词：注塑；残余应力；Kriging代理模型；工艺参数；贝塞尔曲线
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444.渐扩-渐缩流动下的聚丙烯热性能研究
[橡胶和塑料制品业] [2015-04-26]
设计通过渐扩-渐缩流动产生拉伸形变的口模使物料在口模中受到周期性变化的拉伸/挤压应力作用。将口模连接在高压毛细管流变仪上,通过改变口模的组合形式对物料在流场中的停留时间进行调控,采用熔融挤出的方法分析物料在流场的停留时间对聚丙烯(PP)的结晶性能、热稳定性能等的影响。结果表明,渐扩-渐缩流动能有效促进分子链的解缠结,促进分子链沿流场方向取向;PP的结晶性能随收敛板数量的增加而提高,并且收敛板数量越多,效果越明显;PP的热稳定性也随收敛板数量的增加而逐渐提高,起始分解温度向高温方向移动。
关键词：渐扩-渐缩流动；聚丙烯；结晶性能；热稳定性
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445.有机改性凹凸棒土复合P(AA-co-AM)高吸水性树脂的制备及性能研究
[橡胶和塑料制品业] [2015-04-26]
以过硫酸铵为引发剂,表面丙烯酰基化的凹凸棒土(AT-MPS)为交联剂,采用水溶液聚合法制备了丙烯酰基化凹凸棒土复合聚(丙烯酸-co-丙烯酰胺)高吸水性树脂[AT-MPS/P(AA-co-AM)]。考察了中和度、丙烯酸与丙烯酰胺的单体比、引发剂用量以及凹凸棒土用量对复合吸水树脂吸液性能的影响。采用红外光谱(FTIR)、热失重分析(TGA)以及扫描电镜(SEM)等方法对复合吸水树脂进行了表征。结果表明,丙烯酸中和度为75%、m(AA)∶m(AM)=4∶1、引发剂用量为0.8%、AT-MPS用量为8%时,复合吸水树脂的最大吸水倍率为347.7 g/g,最大吸盐水倍率为43.5 g/g。红外光谱分析结果表明,凹凸棒土参与了聚合交联反应;SEM表明,凹凸棒土在复合吸水树脂中具有良好的分散性。
关键词：高吸水性树脂；丙烯酸；丙烯酰胺；凹凸棒土；吸水倍率
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446.聚丙烯/高岭土复合材料的结构与性能
[橡胶和塑料制品业] [2015-04-26]
以钛酸酯偶联剂(NDZ-105)改性的高岭土为填料、马来酸酐接枝的聚丙烯(PP-g-MAH)为相容剂,与聚丙烯(PP)熔融共混制备复合材料,测定了复合材料的力学性能,并通过X射线衍射(XRD)、红外光谱(FTIR)、热失重分析(TG)、扫描电镜(SEM)等手段研究其结构。结果表明,NDZ-105分子包覆到高岭土颗粒表面,有效改善了高岭土与PP基体的相容性;改性高岭土在PP基体中起到异相成核作用,并诱导PP基体产生β晶型;与纯PP及PP/未改性高岭土复合材料相比,PP/改性高岭土复合材料的拉伸强度、冲击强度、屈服强度、弹性模量、维卡软化温度及外推起始失重温度均明显提高,分别增加了7.6%、31%、21%、89.3%、8.4℃及97℃。
关键词：聚丙烯；高岭土；表面改性；复合材料；力学性能
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447.全球丁苯橡胶SBR市场报告（2015-2019年）
[橡胶和塑料制品业] [2015-04-13]
SBR is a synthetic rubber formed by the copolymerization of styrene and butadiene in the ratio of 3:1 by weight. It is manufactured by two processes: emulsion and solution, to form E-SBR and SSBR, respectively. SBR is used for various applications in the Tire, Footwear, Polymer Modification, and Adhesives and Other sectors.
关键词：SBR；苯乙烯；丁二烯；聚合；合成橡胶
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448.全球食品工业膜市场报告（2015-2019年）
[农副食品加工业,化学纤维制造业,食品制造业,橡胶和塑料制品业] [2015-04-12]
A membrane is a type of selective barrier that is used to separate or concentrate the feed stream as it passes through the membrane, which selectively allows some constituents to pass as others are retained on the surface of the membrane. The constituents that are allowed to pass are known as permeates and those that are retained are known as concentrates or retentates. Different types of membrane are used in the Food industry depending on their pore size. The types of technology implemented for membranes include ultrafiltration, microfiltration, reverse osmosis, and nanofiltration. Other membrane technologies such as membrane contractors, electro dialysis, and pervaporation are also used but their market share is low.
关键词：膜；分离或浓缩；选择性屏障
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449.法国冬季轮胎市报告（2015-2019年）
[橡胶和塑料制品业,汽车制造业] [2015-04-11]
The history of tires dates back to the mid-1800s, during which only rubber tires, best known as solid tires, were used. Advances in technology led to the replacement of solid tires by pneumatic tires. They were first used in automobiles by the Michelin brothers, who went on to become one of the prominent tire vendors in Europe. Over time, the Tire market witnessed new breakthroughs in technology and the entry of many vendors.
关键词：轮胎；实心轮胎；更换；充气轮胎；技术突破
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450.欧洲饮料包装市场报告（2015-2019年）
[酒、饮料和精制茶制造业,橡胶和塑料制品业,造纸和纸制品业] [2015-04-11]
Beverage packaging provides product support, external environment protection, and tampering resistance for beverages. Beverage packaging aids in reliable distribution of beverages among the value chain and reduces post-production damage. The raw materials used for packaging are glass, plastic, metal, and other materials. The application of these packaging materials in the Beverages industry is found in hot drinks packaging, packaged water, milk and dairy products packaging, beer packaging, CSD packaging, sports and energy drinks packaging, RTD ice tea packaging, and alcoholic drink packaging.
关键词：饮料包装；产品支持；价值链；减少；后期制作；伤害
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