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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
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
关键词
超细碳酸钙
表面改性
触变性
碳酸钙
浓悬浮体
Ultrafine calcium carbonate, Surface modification, Thixotropy, Yield stress
