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<p>An intermediate containing four hydroxy groups and two carboxyl groups was prepared by the esterification of trimethylolpropane (TMP) and pyromellitic dianhydride (PMDA), which was then polymerized with diisocyanate to form waterborne polyisocyanate in a one-step process. Finally, the excessive isocyanate groups were blocked and the free carboxyl groups were neutralized in sequence, resulting in the formation of a series of blocked waterborne polyisocyanate crosslinkers containing both ester groups and rigid benzene moieties (EWPI). The structures of the crosslinker were characterized utilizing FT-IR and <sup>1</sup>H-NMR. Thermal properties and water dispersibility of crosslinkers were studied accordingly. The properties of the cured materials were also researched in detail. The results demonstrated that the crosslinkers have good water dispersibility. The materials cured by EWPI systems had better adhesion and hardness than the commercial crosslinker system, and the adhesion could reach a maximum of 1.05&#xa0;MPa.</p>

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A novel synthesis route for waterborne polyisocyanate crosslinkers

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Shuai-Wei Lu,
  • Yu-Hang Zhou,
  • Yu-Xin Jiang,
  • Jun Wei

摘要

An intermediate containing four hydroxy groups and two carboxyl groups was prepared by the esterification of trimethylolpropane (TMP) and pyromellitic dianhydride (PMDA), which was then polymerized with diisocyanate to form waterborne polyisocyanate in a one-step process. Finally, the excessive isocyanate groups were blocked and the free carboxyl groups were neutralized in sequence, resulting in the formation of a series of blocked waterborne polyisocyanate crosslinkers containing both ester groups and rigid benzene moieties (EWPI). The structures of the crosslinker were characterized utilizing FT-IR and 1H-NMR. Thermal properties and water dispersibility of crosslinkers were studied accordingly. The properties of the cured materials were also researched in detail. The results demonstrated that the crosslinkers have good water dispersibility. The materials cured by EWPI systems had better adhesion and hardness than the commercial crosslinker system, and the adhesion could reach a maximum of 1.05 MPa.