共查询到20条相似文献,搜索用时 125 毫秒
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以马来酸酐、丙烯酸、2-丙烯酰胺基-2-甲基丙磺酸为原料,水为溶剂,过硫酸铵为引发剂合成了三元共聚物无磷阻垢剂。通过考察不同的因素对共聚物的阻垢性能的影响,确定了该共聚物的最佳合成工艺条件。通过与其它阻垢剂的阻垢性能对比实验,在最佳合成条件的三元共聚物无磷阻垢剂具有优异的阻碳酸钙垢性能。 相似文献
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综述了粗细节丝的生产及应用。介绍了日本各大公司粗细节丝的性能,主要采用的生产技术及其织物的开发应用,特殊粗细节丝现状以及粗细节丝的高次加工。 相似文献
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搅拌混合中的循环与剪切 总被引:12,自引:0,他引:12
搅拌混合中的循环与剪切被定量化,搅拌功率分解为P=Q∑S_k,分解后的循环流量和总剪切强度,以及剪切强度在空间的分布应匹配.混合对偶合反应过程影响的实验结果表明,循环/剪切比适中的搅拌桨能较好地满足偶合反应工艺的需要,其分隔指数最小.用修正的拉格朗日法进行过程模拟,结果表明团块的循环经历影响其局部分隔指数,增大单位体积功耗、循环/剪切比以及循环区与桨叶区的能耗分配比能降低偶合反应的分隔指数. 相似文献
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青花红绿彩作为加彩器的一种,比传统的观点早一个朝代,根据明中青花红绿彩盖罐结合最新的窑址考古成果,得出元代的窑炉设计和釉面配方的缺陷,使元代青花红绿彩的生产和存世极少,明官窑中由于斗彩的出现,青花红绿彩在民间一直沿烧。与元代风格相近,只是到了后期风格才大变。 相似文献
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SMC和DMC模塑料成型加工及制品应用 总被引:3,自引:0,他引:3
介绍SMC和DMC玻璃纤维增强不饱和聚酯树脂模塑料在成型中的缺陷及改进措施,举例说明了两种模塑料制品在车辆、电气等方面的应用。 相似文献
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A sheet of paper is modelled as a network of cellulose fibres, either cylindrical or band-shaped. The equations for creeping flow through such structures are solved, and The calculated permeabilities are compared with measured values. Flow through some paper structures such as pulp sheets and handsheets of unbeaten sulphate pulp is adequately described by the structural model involving band-shaped fibres when a fibre aspect ratio of 3.5 is used. For newsprint sheets the measured permeability is lower than that predicted by the models when physically realistic values of the aspect ratio are taken. A total of 19 different paper grades have been characterised by measurement of the total specific surface area and The fibre orientation ratio in addition to the measurements of effective diffusivity, permeability and porosity. Permeability and effective diffusivity correlate with each other and permeability correlates with fibre orientation, so that at constant porosity, permeability decreases with increasing fibre orientation. 相似文献
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Zhen-Xiang Gong Arun S. Mujumdar Yoshinori Itaya Shigekatsu Mori Masanobu Hasatani 《Drying Technology》1998,16(6):1119-1152
The researches on drying of clay and nonclay media are briefly reviewed and the role of drying in the manufacturing process is summarized. The drying process must be carefully controlled to maintain the desired product configuration. Inefficient completion of drying and poor operation of the dryer influence directly the product quality. The importance of R&D on the heat and moisture transfer phenomena, shrinkage mechanisms, deformation behavior, strain-stress relations and the internal pressure in the media during drying is stressed. Suggestions are given for further improvement of the drying process and improved design of the molding and casting processes for higher product quality 相似文献
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