Synthesis and Properties of Copolyester Resin for Precoated MeTAL

Precoated Metal용 Copolyester Resin의 합성 및 물성

  • Park, Lee Soon (Department of Polymer Science, Kyungpook Natational University) ;
  • Lee, Tae Hyung (Department of Polymer Science, Kyungpook Natational University) ;
  • Kim, Soon Hak (Department of Polymer Science, Kyungpook Natational University) ;
  • Chang, Jin Gyu (Department of Chemical Industry, Dongeui Institute of Technology)
  • 박이순 (경북대학교 고분자공학과) ;
  • 이태형 (경북대학교 고분자공학과) ;
  • 김순학 (경북대학교 고분자공학과) ;
  • 장진규 (동의공업대학 화학공업과)
  • Received : 1998.12.23
  • Accepted : 1999.03.05
  • Published : 1999.05.10


Copolyester resins for the coil coating process of aluminium and steel strip were synthesized and their thermal properties, molecular weight and solvent solution characteristics were examined. Copolyesters were obtained by two step reactions. The first step was to prepare bishydroxyethyl terephthalate (BHET), bishydroxyneopentyl terephthalate (BHNPT), bishydroxyethyl isophthalate (BHEI), bishydroxyneopentyl sebacate (BHNPS), bishydroxyneopentyl adipicate (BHNPA) and bishydroxyethyl adipicate (BHEA) oligomers by esterification reactions. The second step was the polycondensation reaction utilizing those oligomers to obtain relatively high molecular weight copolyesters (Mw = 30,000~59,000 g/mol) as measured by GPC. These copolyesters were amorphous polymers as shown by DSC without $T_m$ peaks probably due to the kink structure introduced by BHET oligomer and relatively large free volume by bulky BHNPT and BHNPS oligomers. The copolyester samples with half of BHET oligomer substituted by BHNPT while keeping BHEI (0.3 mole) and BHNPS (0.1 mole) ratio constant showed glass transition temperature above $40^{\circ}C$ and good solubility in toluene both at low ($-5^{\circ}C$) temperature and room temperature.


Supported by : 한국과학재단


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