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Synthesis and storage stability of polyester urethane resin
Author(s): 
Pages: 29-32,41
Year: Issue:  2
Journal: China Synthetic Resin and Plastics

Keyword:  polyurethanepolyester typestorage stability;
Abstract: A series of polyurethane (PU) solution with solid content of 30% including polycarbonate diol urethane (PCDLU), polybutylene adipate glycol urethane (PBAU) and polycaprolactone glycol urethane (PCLU) were prepared respectively by one-step solution method with polycarbonate diol, polybutylene adipate glycol and polycaprolactone glycol as soft segments, and diphenylmethane-4,4′-diisocyanate and 1,4-butanediol as hard segments. The storage stability of the PU resins was studied. The results show that the storage stability of the resins synthesized with Zr catalyst or Bi catalyst is superior, and the decrease of the acid value can improve the storage stability. The structure of soft segments influences the storage stability, and the resins whose storage stability ranked from the highest to the lowest are as follows: PCDLU, PBAU and PCLU. All the resins can maintain excellent mechanical properties after thermal ageing. The decrease in viscosity of the PU resins during thermal ageing is due to the breakage of PU molecular chains.
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