共查询到20条相似文献,搜索用时 62 毫秒
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木纹结皮发泡PVC异型材的挤出 总被引:2,自引:0,他引:2
用普通单螺杆挤出机和自制结皮发泡模具,应用不同树脂进行配方工艺试验,结果表明:利用不同材料的流动性差异,并结合模具进行设计,可以挤出木纹效果良好的PVC结皮发泡异型材。 相似文献
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PVC结皮发泡异型材的木纹挤出 总被引:2,自引:0,他引:2
介绍一次性挤出木纹产品的工艺与配方。配方设计饭知着包母粒和发泡材料,通过不同颜料和着色母料组合,可达到不同的木纹组合效果;发泡材料的最佳配方为PVC S-700(100),PA-60(7),SW-401(5),LUB-201(1.2),轻质碳酸钙(5),CN-010(0.8),颜料(适当)。生产工艺包括采用特殊的多孔板和一组组合芯体,实现了多束料流组合,形成木纹挤出。 相似文献
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分析了PVC低发泡异型材生产中糊料的原因。并从原料、配方、设备、工艺等方面提出了解决办法. 相似文献
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概述塑料异型材的优点及应用实例,从原料选择与配方设计、挤出设备、制品断面设计及机头模具、挤出成型工艺等方面阐述了塑料异型材的挤出成型技术,介绍了低发泡、复合共挤出等其它异型材的成型技术,并展望了塑料异型材的发展趋势。 相似文献
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介绍了共聚聚丙烯管材的特点,阐述了茂名乙烯新产品无规共聚聚丙烯EP1D60P管材专用料的开发、生产、应用和微观结构论证等过程,生产出的管材通过了国家化学建筑材料测试中心的8760h长期热稳定性能测试及相关安全、卫生的检测,并已通过中国石化集团公司组织的技术鉴定。 相似文献
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探究在新升本科院校《仪器分析》专业课发展中存在的问题,提出创造条件搞科研、提高教师专业知识,改变教法激发学生学习兴趣,适当增加仪器操作时间、改变实验管理模式等教学改革措施。 相似文献
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Complex fluids have long posed a significant challenge in our ability to characterize and model fluid properties. Here, we consider complex fluids to be mixtures with many components that can differ significantly in polarity and polarizability. The penultimate complex fluid is crude oil, although many other fluids such as finished fuels are also highly complex. We have recently introduced a measurement strategy that can simplify these efforts and provides the added potential of linking chemical composition (i.e. analytical) information with physical property information. In addition to chemical characterization, the approach provides the ability to calculate thermodynamic and transport properties for such complex heterogeneous streams. The technique is based on the advanced distillation curve (ADC) metrology, which separates a complex fluid by distillation into fractions that are sampled, and for which thermodynamically consistent temperatures are measured at atmospheric pressure. The collected sample fractions can be analyzed by any method that is appropriate. Analytical methods we have applied include gas chromatography (with flame ionization, mass spectrometric and sulfur chemiluminescence detection), thin‐layer chromatography, FTIR, Karl Fischer coulombic titrimetry, refractometry, corrosivity analysis, neutron activation analysis and cold neutron prompt gamma activation analysis. We have applied this method on product streams such as finished fuels (gasoline, diesel fuels, aviation fuels, rocket propellants), crude oils (including a crude oil made from swine manure) and waste oil streams (used automotive and transformer oils). In this review, we describe the essential features of the ADC metrology with illustrative examples. 相似文献
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PVC中有机锡化合物的气相色谱测定 总被引:2,自引:0,他引:2
本文介绍了聚氯乙烯(PVC)树脂中有机锡化合物的气相色谱(GC)分析方法。即将PVC树脂溶于四氢呋喃(THF)中,提取有机锡化合物,然后加到丙基镁溴化物(PMB)的THF溶液中,进行丙基化,反应液中残存的过量PMB,用0.5m硫酸分解,生成的四烷基锡化合物用己烷提取,过滤、脱水、浓缩,进行GC分析。利用本法有机锡化合物的检出限量(换算成氯化物)是0.1ng,处理1g树脂试样,其定量检出限量为2μg/g。测定了9种有机锡稳定剂,其添加实验的回收率为88.3~99.6%,相对标准偏差分别是2.2~6.8%。 相似文献
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气力输送粉料流量测量的差压-浓度法 总被引:2,自引:0,他引:2
本文基于物料稀相气力输送压损比与混和比(m)的比例关系式: =1+k·m提出了一种以气固两相管程总压降(△Pt)和粉料浓度(βs)为测量参数的在线测量气力输送粉料流量的新方法,建立了差压-浓度法粉料流量测量数学模型及格应的测量系统。经实验验证,精度为5%,满足工业应用要求。 相似文献