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Rheological properties of  Fumed Silica

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Rheological properties of  Fumed Silica

Rheology is an important performance of coatings, it directly affects the appearance of the coating, construction performance and storage stability, performance, and different coating system requirement for rheological additives also have differences. For oil system, most of the rheological additives are form hydrogen bonding, play a role. The surface of the untreated silica aggregate contains multiple, among them, one is isolated, no interference free 2 it is even born, each other to form hydrogen bond of bonded hydrogen bonding in oily system, easy to form a three-dimensional network structure, this structure is influenced by mechanical force will damage, decrease viscosity, coating to restore good liquidity;When the shear force is removed, the three-dimensional structure will recover on its own and the viscosity will rise.In polar liquid, the recovery time is longer, depending on the concentration and dispersion degree of white carbon black, this feature gives oily coating performance very good storage and construction, especially high build coating, coating can be ensured under certain construction shear force have good liquidity, and can guarantee a construction coating thickness, usually, in the process of construction, due to the edge of the coating solvent evaporation rapidly and results in uneven surface tension, easy to make the paint to the edge, and white carbon black network can effectively prevent the mobile to form a thick edge of paint, but also prevent the paint flow phenomenon in the curing process, uniform coating. In the meantime, the white carbon blackDue to its ability to form hydrogen bonds, the medium and low shear viscosity in the system can be improved, thus playing a role in thickening. Therefore, silica is widely used in oily systems.

Pub Time : 2019-11-18 10:32:04 >> News list
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