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KMID : 0604520120380040271
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Journal of the Society of Cosmetic Scientists of Korea
2012 Volume.38 No. 4 p.271 ~ p.276
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A Research on Powder Dispersion Ability Using Several Content, Variety of Powder and Additive in Aqueous System
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Kim Sun-Young
Kim Il-Gu
Choi Seung-Man
Lee Sang-Min
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Abstract
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In this study, the dispersion ability of powder in low viscosity solubilization system that depends on variety and amount of additives and powders was investigated. A PMMA powder shows outstanding dispersion ability because of its repulsive force of partially charged chain and low density of porous structure. A sample, which contains salts, showed better dispersion tendency than a sample without any additives. The dispersion ability was quantity of salts dependent. Furthermore, a sample with divalent ion salts, like MgSO4, showed better dispersion tendency than that of monovalent ion salts, like NaCl or KCl. The reason for the better dispersion tendency was due to the existence of ionized salts around the powders which significantly improves repulsive force between powders and consequently reduces powder aggregation. The sample with chelating agent, like EDTA as an additive, had improved dispersion ability. EDTA chelates and blocks metal cation therefore anion’s character is maximized and repulsive force between powders is improved. As a result, salts and EDTA help to improve the powder dispersion ability and the stability of product.
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KEYWORD
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Powder dispersion, salt, EDTA, repulsive force, aggregation
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