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氯化法钛白粉的粒径与粒径分布 总被引:1,自引:1,他引:1
介绍了二氧化钛的粒径与粒径分布对金红石型钛白粉主要性能的影响,并结合氯化法钛白生产过程分析了影响二氧化钛粒径与粒径分布的主要因素. 相似文献
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介绍了聚氨酯分散体粒径与粒径分布概念、测定粒径的方法,分析探讨了分散体内在因素和外部因素对粒径的影响以及聚氨酯分散体的粒径控制。 相似文献
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以磔酸钙为分散剂,添加表面活性剂进行了甲基丙烯酸甲酯和苯乙烯的悬浮共聚,研究了分散剂和表面活性剂浓度、搅拌转速对聚合物粒径及粒径分布的影响。观察到了使粒径基本保持不变的分散剂的临界浓度,及使悬浮体系保持稳定的分散剂与表面活性剂浓度之间的适当比例,并得到了粒径与搅拌转速的关联式。 相似文献
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一、引言分散染料的分散性及其分散稳定性与染料的应用效果密切相关,尤其是在高温高压染色和喷射染色时,分散性或分散稳定性差的分散染料易引起色差、色斑以及上染率下降等问题,影响染色品的质量。目前,分散染料的分散性和分散稳定性已成为染料厂商检验分散染料质量的重要指标之一。评价一个分散染料分散性的好坏,主要靠 相似文献
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大粒径硅溶胶在涂料、化学机械抛光、催化剂载体等工业领域中都有着极其广泛的应用。在添加适量催化剂的条件下,采用单质硅粉氧化法制备了大粒径溶胶。重点介绍了大粒径硅溶胶的分类、性质及应用,通过研究不同条件下大粒径硅溶胶的粒径增长过程分析了大粒径硅溶胶制备过程中的粒径增长机理。在添加阴离子表面活性剂的条件下,采用浓缩蒸馏实验研究了大粒径硅溶胶粒径增长与其浓度的关系,结果表明:随着大粒径硅溶胶浓度的增大,大粒径硅溶胶的粒径呈先减小后增大的趋势。最后提出了制备大粒径硅溶胶的粒径控制工艺。 相似文献
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通过悬浮醇解不饱和二元酸-醋酸乙烯共聚物(COPVAc),研究了搅拌转速、桨型、釜径、共聚物初始浓度、NaOH浓度、相比、石蜡油粘度及碳氢化合物数量对COPVAc醇解物COPVA粒径和粒径分布的影响,确定了相应的关联式,并探讨了COPVA粒径控制方法,以便为最佳操作条件选择和反应器设计提供依据. 相似文献
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苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况,合成乙苯,苯乙烯所用的催化剂种类,并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。 相似文献
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Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile
Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, 13C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc. 相似文献
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G. R. Hamed 《The Journal of Adhesion》1983,16(1):31-39
A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength. 相似文献
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责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体. 相似文献
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Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method1 was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity. 相似文献
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