TITLE:
The Studies on the Surface Organic Modification of Tourmaline Powder with Stearic Acid and Its Composite
AUTHORS:
Yingmo Hu
KEYWORDS:
Tourmaline, Stearic Acid, Surface Modification, Negative Ion, Composites
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.4 No.3,
July
11,
2014
ABSTRACT: Stearic acid modified
tourmaline powder had been investigated to improve the compatibility and
dispersed stability between tourmaline and polymer matrix. The experimental
results indicated that the activation index was 100% and contact angle reached
120° when the ratio of the ore slurry is 5:50, the dosage of stearic acid and p-toluenesulfonic acid is 10% and 0.5% (of
tourmaline powder’s quantity) respectively with reaction at 80°C for 6.0 h, and
the modified tourmaline exhibited an excellent hydrophobic property. The
introduction of stearic groups reduced the reunion of tourmaline particles
clearly and improved the dispersivity in polymers, and the amount of negative
ions released of modified tourmaline increased obviously for both modified
tourmaline powders and its composite with polyamide-66 compared to the
unmodified tourmaline. Moreover, the structure of modified tourmaline was also
characterized by means of Fourier Transform infrared spectroscopy, X-ray
diffraction, thermal gravimetric analysis, scanning electron microscope.