A Comparative Study on Polyurethane Coating Films Prepared Using 4,4'-Methylenebis(2-chloroaniline) and 1,3-Propanediolbis(4-aminobenzoate) as Crosslinking Agents

4,4'-Methylenebis(2-chloroaniline)과 1,3-Propanediolbis(4-aminobenzoate)를 가교제로 사용하여 제조한 폴리우레탄 코팅 필름의 특성 비교

  • Lee, Youn-Sik (Division of Environmental and Chemical Engineering, The Nanomaterials Research Center, Chonbuk National University) ;
  • Lee, Sung-Il (Division of Environmental and Chemical Engineering, The Nanomaterials Research Center, Chonbuk National University) ;
  • Kim, Duk-Bae (Division of Environmental and Chemical Engineering, The Nanomaterials Research Center, Chonbuk National University) ;
  • Park, Young-Deok (Department of Chemistry, Chonbuk National University) ;
  • Kim, Jung-Kee (Division of Environmental and Chemical Engineering, The Nanomaterials Research Center, Chonbuk National University) ;
  • Hahn, Yoon-Bong (Division of Environmental and Chemical Engineering, The Nanomaterials Research Center, Chonbuk National University) ;
  • Nahm, Kee-Suk (Division of Environmental and Chemical Engineering, The Nanomaterials Research Center, Chonbuk National University)
  • 이연식 (전북대학교 환경.화학공학부) ;
  • 이성일 (전북대학교 환경.화학공학부) ;
  • 김덕배 (전북대학교 환경.화학공학부) ;
  • 박영덕 (전북대학교 화학과) ;
  • 김정기 (전북대학교 환경.화학공학부) ;
  • 한윤봉 (전북대학교 환경.화학공학부) ;
  • 남기석 (전북대학교 환경.화학공학부)
  • Published : 2004.03.31

Abstract

4,4'-Methylenebis(2-chloroaniline)(MOCA) has been widely used as a crosslinking agent, but classified as a toxic chemical. Thus, its use will be limited in the near future. In this research, polyurethane coating films were prepared using 1,3-propanediolbis(4-aminobenzoate)(PDBA) as an alternative to MOCA. The base part was prepared by melting MOCA or PDBA in polyoxypropylene($M_n$=2000), followed by the addition of the various additives. The NCO-terminated toluene diisocyanate prepolymer was used as a curing agent. The polyurethane coating films were prepared by mixing the base part with the curing agent in an appropriate ratio at room temperature. The polyurethane coatings prepared using PDBA exhibited higher initial viscosity, but much longer pot lift, compared to those prepared using MOCA under the same conditions, due to lower reactivity of PDBA. The tensile strength and tear strength of the coating films were much weaker. However, the pot life, tensile strength, elongation, and tear strength of the coating films, prepared using PDBA in the presence of an increased amount of Pb(II)-octoate, were close to those of the coating films prepared using MOCA. Thus, it was concluded that PDBA can substitute MOCA in the preparation of polyurethane coatings as long as the reactivity of PDBA is enhanced using appropriate amounts of the catalyst or other appropriate catalyst.

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