Corrosion-resistant coatings and methods using polyureasil precursors

摘要

The disclosure relates to curable polyureasil compounds, methods related to curing of such compounds via hydrolysis and/or condensation to form coatings on a substrate, and coated articles formed from the curable polyureasil compounds. The polyureasil compounds are generally hydrocarbon-based, including multiple urea groups and multiple hydrolysable silyl groups per molecule. The hydrolysable silyl groups can be hydrolyzed and subsequently condensed to provide a networked polymeric structure with siloxane/urea linkages between polyureasil compound precursors to form a cured polyureasil composition useful as a coating for a substrate, in particular an anti-corrosion coating for a metallic substrate.

主权项

1. A process for curing a curable polyureasil compound, the process comprising:
(a) providing a mixture consisting of (i) a curable polyureasil compound comprising: (A) a hydrocarbon moiety comprising at least 2 urea groups bonded thereto, and (B) more than 6 hydrolysable silyl groups linked to the hydrocarbon moiety via at least one of the urea groups, (ii) an organic solvent for the curable polyureasil compound, (iii) water, (iv) a catalyst, and (v) optionally a corrosion inhibitor; and (b) curing the curable polyureasil compound with water, thereby hydrolyzing and condensing at least some of the hydrolysable silyl groups to form a cured polyureasil compound comprising covalent intermolecular siloxane crosslinks in the cured polyureasil compound.