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Cross-linking mechanism for thin organic coatings based on the Hantzsch di-hydropyridine synthesis reaction
Cross-linking mechanism for thin organic coatings based on the Hantzsch di-hydropyridine synthesis reaction
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机译:基于Hantzsch二氢吡啶合成反应的有机薄涂层的交联机理
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摘要
Disclosed is cross-linking process for cross-linking polymeric chains in a coating composition. In one embodiment the process utilizes a Hantzsch dihydropyridine reaction to form reaction products including cross-linking polymeric resin chains having beta-keto ester functions using a source of aldehyde and a source of ammonia or a primary amine to form a permanent dihydropyridine bond between the beta-keto ester functions. The novel cross-linking reaction can occur at lower temperatures compared to typical cross-linking reactions and can occur in aqueous solutions that have a neutral to mildly alkaline pH of from 6 to 11. The novel cross-linking reaction provides many advantages to performing cross-linking of polymeric chains in coating resins.
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