China Plastics ›› 2022, Vol. 36 ›› Issue (5): 104-109.DOI: 10.19491/j.issn.1001-9278.2022.05.017

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Synthesis and application of pentavalent organic bismuth for polyurethane

FENG Xiu1(), SHEN Ying2, XU Sheng1()   

  1. 1.School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China
    2.Shanghai Jixuan New Materials Technology Co,Ltd,Shanghai 201611,China
  • Received:2022-01-06 Online:2022-05-26 Published:2022-05-26

Abstract:

Seven novel types of nontoxic organic bismuth catalysts were synthesized, and their chemical compositions were confirmed by nuclear magnetic resonance spectroscopy, mass spectroscopy, and infrared spectroscopy. Then, these catalysts were used to prepare polyurethane coating materials, and the effects of catalyst structure and dosage on the curing time, corrosion resistance and tensile properties of the polyurethane coating films were investigated. The results indicated that the pentavalent organic bismuth catalyst exhibited better catalytic performance than the bismuth trivalent one. The bismuth metal catalyst with a total mass fraction of 0.3 wt% shortened the curing time of polyurethane coating films one quarter, significantly improving their solvent resistance by 30 % and tensile strength by 33 %, but reducing their elongation at break by 35 %. The bismuth catalyst promoted not only the polymerization reaction but also the chain crosslinking and aggregation to some extent, thus improving the performance of the films. The planarity of the aryl group in the bismuth molecules had a great influence on its activity, and the catalyst containing the oxygen?bridged diphenyl ligand showed good catalytic performance due to its good planarity.

Key words: synthesis, organic bismuth, catalyst, polyurethane

CLC Number: