Abstract
Controlling the powder flow by the surface properties of the particles as well as understanding their flowability under different processing dynamics are amongst the major challenges of the powder industry. Indeed, handling large quantities needs powders with good flowability, adequate compressibility and few electrostatic charges. We have performed a chemical treatment in order to obtain hydrophobic glass bead and its bulk behavior has been compared with raw glass bead. We characterized flow properties under different processing conditions. Both powders presented similar flow behavior in the free fall measurement, however hydrophobic glass bead showed lower flow behavior under flow with rotating drum. Also, hydrophobic glass bead presented negative and raw glass bead almost zero electrostatic charges.
Highlights
Powders are omnipresent in our daily life and they are extensively used in various industries such as pharmaceutical, cosmetics, chemical, food and construction
Controlling the powder flow by the surface properties of the particles as well as understanding their flowability under different processing dynamics are amongst the major challenges of the powder industry
This paper focuses on studying the influence of formulation on powder flowability and evolution of powder flowability under different processing conditions
Summary
In this study glass bead of types S 90-150 μm has been used. Hydrophobic surface treatment has been done on raw glass bead. With the purpose of preparing hydrophobic surface formulation on glass bead, first the hydrophilic surface treatment has been performed [8] it has been followed with silanization. The silanization of glass beads with mixture of toluene (500 mL) and 1H,1H,2H,2Hperfluorooctyltriethoxysilane (2.5 g) has been performed, this mixture has been kept maximum 72 h under extractor hood at ambient temperature and the powder filtered and washed with pure toluene and they kept about 24 h under extractor hood for evaporating the toluene inside the powder and with the purpose of completely drying the powder, it has been kept in an oven, maximum 4 h at 70 ◦C
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