Additives Applied for Preparation of Superfine Mg(OH)₂ Particles by Light-Burned MgO at Low Temperature

Abstract:

Due to its buffer property, activity, absorbability and safety, magnesium hydroxide is widely used in environmental protection, pharmaceutics, pulp and paper industry, and as flame-retardant filling in composite materials. The hydrothermal synthesis of magnesium hydroxide at low temperature (< 100°C) needs only simple equipment and is environmentally friendly and energy-saving, so the process is promising and easy for industrialization. In this study, we have investigated the effects of hexamethylenetetramine and ammonia additives on the hydrating synthesis of superfine Mg (OH)₂ particles at 70°C. Mg (OH)₂ particles formed were of platelet shape and the mean diameter was approximately 200nm. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were applied to characterize the crystal phase, size distribution and morphology of the crystal particles. Different morphologies of Mg (OH)₂ particles were formed in hexamethylenetetramine and ammonia solutions. The generation velocity of hydroxyl (OH^-) was found to play an important role in the distribution and morphology of Mg (OH)₂ particles.

• Periodical: Applied Mechanics and Materials (Volumes 130-134)
• Pages: 1026-1030
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.130-134.1026
• Online since: October 2011
• Authors: Qing Gang Kong, Hai Yan Qian, Hui Ning Xiao, Kai Liu, Jian Ke Wang, Jing Zhu, Jun Li
• Keywords: Chemical Synthesis, Magnesium Hydroxide, Nanostructure

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