Stabilisation of acrylic latexes containing silica nanoparticles for dirt repellent coating applications
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Publication date
2023-04Author
Swift, ThomasKeyword
Silica nanoparticlesHigh concentration polymer latex solutions
Waterborne emulsion
Dirt repellent
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© 2023 Published by Elsevier Ltd. This work is licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/Peer-Reviewed
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openAccess
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This study examines the feasibility of using colloidal silica nanoparticles as active agents in high concentration waterborne polymer latex formulations. We showed that distributing the silica throughout the waterborne emulsion formed a composite coating material with a hydrophilic surface that consequently reduced exterior dirt pickup. Two grades of silica nanoparticles were studied, one using sodium stabilisation and another using epoxysilane modification to introduce glycidox-ypropyltrimethoxysilane surface functionality. Rheological study of the waterborne latex on mixing showed that there was an immediate pH responsive interaction between the silica sols and the polymer latex. Once loading of sodium charge stabilised silica NPs exceeded the volume required for heteroflocculation to occur the mixture demonstrated the potential to gel on standing – a process which took weeks, or months, to occur depending on the pH and relative concentrations used. At least fifty percent silane modification to the NP surface was found to be necessary to maintain a stable colloidal dispersion for long term storage of the waterborne latex. Despite this both grades of silica were found to imbue reductions in dirt pickup when applied to exterior masonry concrete studies over a 3-month weathering testVersion
Published versionCitation
Swift T (2023) Stabilisation of acrylic latexes containing silica nanoparticles for dirt repellent coating applications. Polymer. 271: 125830.Link to Version of Record
https://doi.org/10.1016/j.polymer.2023.125830Type
Articleae974a485f413a2113503eed53cd6c53
https://doi.org/10.1016/j.polymer.2023.125830