超细改性碳酸钙浓悬浮体的正负触变性  

Thixotropy-antithixotropy Behavior of Concentrated Surfacemodified Ultrafine Calcium Carbonate Suspension

作　　者：陈飞跃[1] 顾燕芳[1] 王松 胡黎明[1] 

机构地区：[1]华东理工大学国家超细粉末工程研究中心,上海200237

出　　处：《高等学校化学学报》1998年第1期99-102,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

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，结合悬泞体的分散稳定性能，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．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.

关 键 词：超细碳酸钙 表面改性 触变性 碳酸钙 浓悬浮体 

分 类 号：O614.231[理学—无机化学]