Abstract
AbstractHydroxyl‐terminated cationic waterborne polyurethanes (HCWPUs) were synthesized using N‐methyldiethanolamine (N‐MDEA) as internal emulsifier and mixed with cross‐linker of nonionic waterborne blocked polyisocyanate (NWBI) to prepare cathodic electrodeposition (CED) coatings. The effects of N‐MDEA content, NCO/OH molar ratio, neutralization degree, and NWBI content on the performance of HCWPUs emulsion and relevant CED coatings were investigated. The results showed that 7.5 wt.% of N‐MDEA content, 0.9/1 of NCO/OH molar ratio, and 100% of neutralization degree were the optimal experimental parameter for synthesizing excellent performance HCWPUs. Incorporation of nonionic waterborne blocked isocyanate could significantly promote the hardness, adhesion, and solvent resistance of CED coatings without influencing the emulsion stability and coatings thermostability.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
