Amphiphilic macromolecular emulsifier with switchable surface activity and use thereof in preparation of polymer latex
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United States of America Patent
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Apr 18, 2017
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Oct 23, 2014
app pub date -
Dec 21, 2012
filing date -
Dec 21, 2011
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Abstract
A macromolecular emulsifier with switchable surface activity, and use thereof for preparation of polymer latex is disclosed. By using the macromolecular emulsifier with switchable surface activity as an emulsifier, a reversibly coagulable and re-dispersible polymer latex can be prepared by emulsion polymerization. The polymer latex can achieve the coagulation of latex particles by heating and aerating with nitrogen, air, inert gas and/or adding a small amount of alkali solution; the coagulated latex particles can be restored and re-dispersed into stable latex by aerating with carbon dioxide and/or adding a small amount of acid solution. The coagulation and re-dispersion process is reversible and is easy to control.
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