| 超细改性碳酸钙浓悬浮体的正负触变性 |
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| 引用本文： | 陈飞跃,顾燕芳,王松,胡黎明.超细改性碳酸钙浓悬浮体的正负触变性[J].高等学校化学学报,1998,19(1):99-102. |
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| 作者姓名： | 陈飞跃 顾燕芳 王松 胡黎明 |
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| 作者单位： | 华东理工大学国家超细粉末工程研究中心, 上海, 200237 |
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| 摘 要： | 以超细改性碳酸钙、氧化钙、邻苯二甲酸二辛脂组成的浓悬浮体为对象,用触变性和屈服应力来探测悬浮体的内部结构,结合悬浮体的分散稳定性能,讨论了正负触变性的形成、稳定性和可逆转变及触变性结构的强度,并考察了游离脂肪酸对悬浮体正负触变性转化的影响.
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| 关 键 词： | 超细碳酸钙 表面改性 触变性 屈服应力 |
| 收稿时间： | 1996-10-24 |
Thixotropy-antithixotropy Behavior of Concentrated Surface-modified Ultrafine Calcium Carbonate Suspension |
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| CHEN Fei-Yue,GU Yan-Fang,WANG Song,HU Li-Ming.Thixotropy-antithixotropy Behavior of Concentrated Surface-modified Ultrafine Calcium Carbonate Suspension[J].Chemical Research In Chinese Universities,1998,19(1):99-102. |
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| Authors: | CHEN Fei-Yue GU Yan-Fang WANG Song HU Li-Ming |
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| Institution: | National Engineering Research Center of Ultrafine Power, East China University of Science and Technology, Shanghai, 200237 |
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| Abstract: | A suspension consists of surface-modified ultrafine calcium carbonate, di-n-octylphthalate and calcium oxide was used as the research system in this paper. The transforming from antithixotropy to thixotropy, the formation, stability and strength of the thixotropic structure, and the influence of the free fatty acid on the transforming were studied in detail.The results revealed that the transforming depends on the storage time. As the storage time extended, the suspension transfers from antithixotropy to thixotropy and stable thixotropy was obtained after stored 24 h. At the same time, the strength of flocculated structure stablized gradually. If the free fatty acid exists, the suspension will transfer to antithixotropy.And a physical model of the thixotropic structure is introduced, which is connected with the dispersion-stability properties of the suspension. |
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| Keywords: | Ultrafine calcium carbonate Surface modification Thixotropy Yield stress |
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