Surface modification of anhydrous borax powders with stearic acid via mechanical dry powder coating

Yıl 2019, Cilt: 4 Sayı: 1, 7 - 15, 16.03.2019

Süleyman Akpınar , Zeyni Arsoy , R. Sena Şenol

https://doi.org/10.30728/boron.414410

Öz

Surface modification of anhydrous borax powders with
stearic acid in the laboratory-scale planetary ball mill via mechanical dry
powder coating approach was investigated.
The alteration of hydrophilic surface properties of anhydrous borax with stearic
acid was optimized by modifier amount and activation time. The cohesion
mechanisms of powders, which processed at conditions of 0.5, 1 and 2 wt. % stearic
acid amount with the function of 30, 60 and 120 minute activation time, were
evaluated in terms of the solubility test, contact angle measurements, particle
size distributions, and scanning electron
microscopy (SEM) analysis. Results indicate that anhydrous borax surface could
be switched from hydrophilic to hydrophobic with changing contact angle from
wetting (17^o) to non-wetting (99^o). Water-insoluble amount of anhydrous borax powders, as a coating
efficiency indicator, was increased from 73 % to 91 % by coating with 1 wt. % stearic
acid for 60 min. Furthermore, SEM analysis results demonstrate that stearic
acid was discretely coated over the anhydrous
borax surface. As a conclusion, an effective mechanical dry coating processing
by a one-step coating approach could be
applied to obtain a modified anhydrous
borax surface, which offers controlled solubility behaviour in water-based
suspensions. 

Anahtar Kelimeler

Anhydrous borax, Stearic acid, Surface modification, Dry Coating

Kaynakça

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