PHT powder coating materials
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United States of America Patent
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May 9, 2017
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N/A
app pub date -
Dec 9, 2014
filing date -
Oct 16, 2014
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Abstract
A coating for an article may be made by applying a powder of a polyhemiaminal (PHA) polymer material to the article in a particulate form and then converting the PHA polymer material to a polyhexahydrotriazine (PHT) polymer material and fusing the particles into a monolithic coating by applying heat to the particles. The method generally includes forming a dilute reaction mixture comprising a formaldehyde reactant, a solvent, a primary aromatic diamine, and heating the reaction mixture to a temperature of between about 20° C. and about 120° C. for a short time to form a polymer. A particulate solid is precipitated by adding an excess volume of a non-solvent to the mixture. The powder may be applied to an article and then heated to fuse the powder into a coating and convert the PHA to PHT.
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