The influence of stearic acid coating on the properties of magnesium hydroxide,hydromagnesite, and hydrotalcite powders |
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Authors: | Walter W Focke Dan Molefe F J W Labuschagne Shatish Ramjee |
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Affiliation: | (1) Department of Chemical Engineering, Institute of Applied Materials, University of Pretoria, Lynnwood Road, Pretoria, South Africa;(2) Department of Chemistry, University of Pretoria, Lynnwood Road, Pretoria, South Africa |
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Abstract: | Hydrated filler-type flame retardants were coated with approximately a monolayer of stearic acid using a solvent technique.
Compared to the uncoated powders, the BET surface area was lower, the powder packing density was improved, and the thickening
effect on white oil was significantly reduced. The latter two observations are rationalized in terms of a reduction in the
attractive interactions between the powder particles. The viscosity of white oil slurries containing 25 wt% solids showed
shear-thinning non-Newtonian behavior. The coated powders showed significantly lower viscosities at low shear rates although
the difference diminished at high shear rates. The lower viscosities shown by the coated powders indicate that the surface
modification facilitated the break-up of agglomerates and the dispersion of individual particles in the fluid. |
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