| 摘要 |
Shear thickening fluids which comprise a water swellable granular material (clay) present in sufficient quantity so as to be capable of rapidly forming a stiff paste, having a strength of at least 2000 lbs/ 100 ft.2 upon interaction with the aqueous phase used, a nonaqueous hydrophobic material comprising a hydrocarbon material and a surfactant and/or a strengthening agent, and an aqueous solution comprising water and water-soluble/water-swellable polymer, wherein the granular clay and water-polymer solution are kept separated by the intervening hydrocarbon-surfactant composition. Discrete particles of granular clay are encapsulated in the oil phase and individual droplets of water-polymer are also encapsulated in the oil phase resulting in an oil continuous phase composite. The intervening oil phase prevents the interaction between the water-polymer and the granular clay phases and results in a stable, non-reacting, pumpable composite until such time as the oil envelope is ruptured by application of a sufficiently high shear force. Upon such rupture, the materials interact resulting in the semi-rigid high strength paste. |
