共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
简述稻壳灰白炭黑生产的环保优势,研究稻壳灰白炭黑性能及其在轿车轮胎胎面胶中的应用,并与高分散性白炭黑、易分散性白炭黑和普通白炭黑进行对比。结果表明:稻壳灰白炭黑纯度高,比表面积小,其他理化性能与高分散性白炭黑差异不大,造粒程度高;稻壳灰白炭黑的宏观形貌、微观形貌与高分散性白炭黑一致,激光粒径分布与高分散性白炭黑相近,分散性明显优于易分散性白炭黑和普通白炭黑;稻壳灰白炭黑胶料在混炼过程中的升温速率、混炼时间和门尼粘度均与高分散性白炭黑胶料接近,加工性能优于易分散性白炭黑和普通白炭黑胶料;稻壳灰白炭黑胶料的硫化特性和物理性能与高分散性白炭黑胶料基本相当;稻壳灰白炭黑胶料的动态力学性能与高分散性白炭黑、易分散性白炭黑和普通白炭黑胶料无明显差异;稻壳灰白炭黑胶料的耐屈挠性能较好,与高分散性白炭黑胶料相近。 相似文献
5.
6.
研究4种炭黑(V9HX1,N110,N115和N134)在全钢载重子午线轮胎胎面胶中的应用。结果表明:炭黑V9HX1填充胶料生热低,耐磨、补强、分散性好,但抗撕裂性能较差;炭黑N134填充胶料生热中等、耐磨性能好,具有一定的抗撕裂性能、但分散性和加工性能较差;炭黑N110填充胶料生热中等,抗撕裂性能优异,分散性好,但耐磨性能略差;炭黑N115填充胶料具有优良的抗撕裂性能,分散性好,但生热高,耐磨性能略差;4种炭黑对胎面胶性能的影响有所差异,建议根据产品使用环境要求选择合适的高结构度、大比面积炭黑品种。 相似文献
7.
8.
9.
10.
11.
The effects of the continuous and dispersed phase velocity and particle size on the axial dispersion of the continuous phase have been determined in two (liquid-liquid) and three (liquid-liquid-solid) phase fluidized beds. In a cocurrent liquid-liquid flow system, the axial dispersion coefficient increases with both the dispersed and continuous phase velocities. In three phase fluidized beds, the coefficient increases with dispersed phase velocity but it decreases with the particle size. Also the coefficient exhibits a maximum value with an increase in the continuous phase velocity at the lower dispersed phase velocities, but it increases with the continuous phase velocity at higher dispersed phase velocities. The axial dispersion coefficients in terms of Peclet number have been correlated in terms of the ratio of fluid velocities and the ratio of the particle size to column diameter, based on the isotropic turbulence theory. 相似文献
12.
负离子型聚氨酯离聚体水分散过程的相反转 总被引:1,自引:0,他引:1
用异佛尔酮二异氰酸酯、聚己二酸新戊二醇酯和二羟甲基丙酸(DMPA)合成了负离子型聚氨酯离聚体.研究了该类离聚体在水分散过程中的相反转变化,讨论了DMPA质量分数和水分散温度对相反转过程的影响。结果表明,DMPA质量分数增加或水分散温度提高,可使相反转所需的时间缩短,分散液粒子粒径变小,粒径分布更均匀,黏度增大。水分散温度的作用较DMPA更为明显。差示扫描量热分析表明,水分散过程破坏了亲水性硬链段的有序性。傅里叶变换红外光谱分析表明,聚氨酯水分散液用乙二胺扩链后.脲羰基的氢键化程度随DMPA质量分数的增加、水分散温度的提高而提高。 相似文献
13.
在总容积10升的双混合室混合澄清器内,以异辛基磷酸单异辛酯-煤油/稀土金属氯化物水溶液作无传质体系,在重力场、助澄清挡板或低压电场等三种不同澄清环境下,用五个不同流比,对两种类型液—液混合相连续分相影响进行了研究.实验结果表明:在重力场或助澄清挡板作用下,流比对两类混合相分相的影响可用分散带容积及两相夹带值表征;在重力场作用下,“油包水”及“水包油”两类混合相的分相都存在对应于分散带容积较少及两相夹带值较低的不同流比;在助澄清挡板作用下,两类混合相的分相也都存在对应于减少分散带容积和降低两相夹带值效果最好的不同流比;在低压电场作用下,对于油包水型混合相的分相分散带容积减少及降低水相被夹带效果与较理想流比是一致的. 相似文献
14.
Preparation of aqueous dispersion of epoxy curing agent with specially synthesized phase inversion emulsifier 总被引:3,自引:0,他引:3
下载免费PDF全文
![点击此处可从《化工学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Generally, the curing agents for aqueous ambient-temperature-cured epoxy resin systems are epoxy-polyamine adduct, which are rendered water-soluble by salting with organic acids, while these acids have adverse influence on film property. It is a trend to develop aqueous dispersion of epoxy curing agent free of organic acids. The conventional surfactants are not suited to act as phase inversion emulsifiers to prepare aqueous dispersion of epoxy-polyamine adduct. So a special phase inversion emulsifier TETADGEPG-EPON834 was synthesized in two steps. Firstly, diglycidyl ether of polyglycol (DGEPG) was used as the chain extender to react with triethylenete tramine (TETA) in propylene glycol methyl ether (PM) at 70℃ for about 4 h. Secondly, epoxy resin (EPON834) was used as the chain extender to react with the adduct of TETA-DGEPG in PM at 65℃ for about 3 h. Then the special phase inversion emulsifier was used to prepare aqueous dispersion of EPON828-TETA adduct terminated by E10. In circumstances of low emulsifier concentration (5%), phase inversion was not completed at phase inversion point (PIP) (0.35). While the phase inversion has completely finished at PIP (0.45) in the circumstances of high emulsifier concentration (10%). A stable aqueous dispersion of EPON828-TETA adduct terminated by E10 was prepared in circumstances of high emulsifier concentration (10%). 相似文献
15.
以包含双油相和单水相的液-液-液三相体系为对象,利用编程控制的CCD照相系统,考察了搅拌槽内不同操作条件下液-液-液三相体系的相分散及分相情况. 实验结果表明,桨型对三相体系的分散情况有较大影响,径流桨的分散效果优于轴流桨,下推式轴流桨优于上推式轴流桨;各相体积比的改变会导致不同的相分散形式;不同相分散形式的分相过程也不相同,实验中体系的分相过程可以分为凝并界面水平型与无规则型两种典型情况,分别对应两种不同的相分散形式;采用分相数学模型,可成功预测凝并界面水平型分相过程中各界面的高度随时间的变化. 相似文献
16.
采用相反转乳化—液中干燥法成功制备出在2~40μm粒径可控且分散性较好的线型氯甲基聚苯乙烯(PCM S)微球,考察了搅拌速度、油相/水相比例、乳化分散体系的组成及加入量等因素对微球粒径及粒径分散度的影响;用扫描电子显微镜观察了微球的形貌。研究结果表明,采用相反转乳化—液中干燥法可制备出球形度极好的PCM S微球;搅拌速度、乳化分散体系的组成与加入量对PCM S微球的粒径都有很大的影响,而影响微球粒径分散系数的主要因素是搅拌速度与油相/水相的比例,分散剂的量对分散系数也有很大的影响。 相似文献
17.
18.
研究了上粘度与配伍、水相粘度、水相表面张力和两相体积比对复色多相聚合物/油/水 影响规律。结果表明:聚合物/油/水分散体系的分散过程主要是由两相粘度决定的,油相粘度大于1.50Pa·s时,易使粒子分散成为丝状或条形,油相粘度在1.50Pa·s以下,则得到球形成椭球形粒子;水相粘度过大、油相/水相体系比增大,均将使油相粒子细分散化,两相体积比的临界值随水相粘度的增大而减小;水相表面张力对多相分散体系 相似文献
19.
J. Tan L. Du J. H. Xu K. Wang G. S. Luo 《American Institute of Chemical Engineers》2011,57(10):2647-2656
The scaling of bubble/slug formation in organic solvents at microscale without surfactant was initially investigated by using T‐junction and symmetrically cross‐shaped microfluidic devices. Four unique organic solvents and three dispersion methods were used, forming different flow patterns and dispersion size. The flow pattern of uniform slug flow was investigated. Both the gas–liquid flow and dispersion size, which ranged from 400 to 1400 μm in length and 270 to 430 μm in diameter, depended on several factors including dispersion method, two‐phase flow rates, physical properties of the liquid phase, and structure of microchannels. A general equation L/w = k(QG/QL)αCaβ was used to characterize the dispersion size with modification of QG/QL for different dispersion methods, considering the influences of breakup rate and transformation of the interface shape on the dispersion process. Three models were developed to predict the dispersion size for different dispersion methods, and calculated data were in good agreement with the experimental results. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011 相似文献
20.