Weak polarity solvent aliphatic polyurethane (PU) resins with PBGA as soft segment and IPDI

BDO

IPDA as hard segment were prepared by different organo-metallic catalysts (stannous octoate

dibutyltin dilaurate

MB 20

BiCAT Zn

zirconium acetylacetonate

nickel acetylacetonate

neodymium neodecanoate

cerium neodecanoate).The synthesized aliphatic PU resins were studied by FTIR and GPC.And

the mechanical properties of elastomeric films formed by aliphatic PU resins were tested.In addition

the effects of organo-metallic catalysts on the storage stability of aliphatic PU resins were investigated by storage at high temperature

and the influence mechanism was characterized by FTIR

GPC and 1H-NMR.The researches show that different metal ions had obvious influence on the synthesis and the storage stability of aliphatic PU resins.The significant decreases of viscosity

molecular weight and mechanical properties were caused by the alcoholysis of ester groups of the PU chain during storage at high temperature

especially for the aliphatic PU resins catalyzed by BiCAT Zn and dibutyltin dilaurate.