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51313-02666-Effects of Surface Modification Conditions on Hydrophobicity of Silica-Based Coating Additives

Product Number: 51313-02666-SG
ISBN: 02666 2013 CP
Author: Steven Pawel
Publication Date: 2013
$0.00
$20.00
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D. A. Hillesheim B. L. Armstrong S. J. Pawel S. R. Hunter J. T. Simmpson Z. M. Burns and J. A. Haynes

Oak Ridge National Laboratory

 

Development of SH powders is underway as a potential additive to standard military coating systems to improve water repellency and corrosion protection of the substrate. Because these topcoats are already highly loaded with solids there is a premium on minimization of the total SH powder required to effect the desired properties and thus efficient surface modification of the silica and proper dispersion in the coating formulation are required. Herein is addressed the question of how surface modification of silica particles via chlorosilnane chemistry is affected by the presence of dispersants in the reaction slurry. The properties of the modified silicas were characterized by TGA-MS and microcalorimetry. Furthermore correlations between surface modification conditions and the ultimate affects the modified particles have on corrosion resistance and hydrophobicity of clear coats were assessed. Selection of reaction solvent dispersant compatibility and clear coat formulation are discussed as they pertain to the ability of modified silicas to benefit a corrosion prevention coating.

 

This research was funded by the United States Marine Corps Corrosion and Prevention and Control (CPAC) Program managed by M. E. Koch.
 

D. A. Hillesheim B. L. Armstrong S. J. Pawel S. R. Hunter J. T. Simmpson Z. M. Burns and J. A. Haynes

Oak Ridge National Laboratory

 

Development of SH powders is underway as a potential additive to standard military coating systems to improve water repellency and corrosion protection of the substrate. Because these topcoats are already highly loaded with solids there is a premium on minimization of the total SH powder required to effect the desired properties and thus efficient surface modification of the silica and proper dispersion in the coating formulation are required. Herein is addressed the question of how surface modification of silica particles via chlorosilnane chemistry is affected by the presence of dispersants in the reaction slurry. The properties of the modified silicas were characterized by TGA-MS and microcalorimetry. Furthermore correlations between surface modification conditions and the ultimate affects the modified particles have on corrosion resistance and hydrophobicity of clear coats were assessed. Selection of reaction solvent dispersant compatibility and clear coat formulation are discussed as they pertain to the ability of modified silicas to benefit a corrosion prevention coating.

 

This research was funded by the United States Marine Corps Corrosion and Prevention and Control (CPAC) Program managed by M. E. Koch.
 

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