Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Synthesis and performance assessment of modified epoxy resins containing fatty acid

지방산 변성 에폭시수지 합성과 성능평가

  • 이동찬 (광운대학교 화학공학과) ;
  • 김진욱 (광운대학교 화학공학과) ;
  • 최중소 (광운대학교 화학공학과)
  • Received : 2016.08.25
  • Accepted : 2016.11.24
  • Published : 2016.12.30
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Abstract

In this work, modified epoxy resins which were well melted in mild solvent were synthesized and solubility assessment was carried out for synthesized epoxy resins. Bisphenol-A type, phenol novolac type and ortho-cresol novolac type epoxy resins were used and fatty acid, dodecyl phenol (DP) and toluene diisocyanate (TDI) were added for synthesis of modified epoxy resins containing fatty acid (MEFA). Composition was epoxy resin/fatty acid = 1.0/0.5 and fatty acid/DP = 0.25/0.25 by equivalent weight and twelve MEFAs were synthesized according to epoxy resins. Viscosity and solubility were measured for twelve MEFAs. As a result, solubility of MEFA was excellent for mild solvent according to increasement of contents of benzene ring, glycidyl group and carbon number of alkyl group. And physical properties were measured for each coating of paints after preparing transparent paints of MEFA to melt well in mild solvent among twelve MEFAs. As a result, they showed an optimal performance on conditions of equivalent ratio of bisphenol-A type epoxy resin/fatty acid/DP/TDI; 1.0/0.25/0.25/0.5 and equivalent ratio of phenol novolac type epoxy resin/fatty acid/DP; 1.0/0.25/0.25 for drying time, adhesion, hardness, impact resistance and alkali resistance.

본 논문에서는 약용매에서 용해될 수 있는 지방산 변성 에폭시수지를 합성하였고, 합성한 수지의 용해도 평가가 이루어졌다. 지방산 변성 에폭시수지를 합성하기 위하여 비스페놀A형, 페놀 노볼락형 및 오르소 크레졸 노볼락형의 3종류 에폭시수지를 사용하였고, 여기에 지방산, dodecyl phenol (DP), toluene diisocyanate (TDI)를 도입하였다. 합성조건은 당량기준으로 에폭시수지/지방산 = 1/0.5, 지방산/DP = 0.25/0.25, TDI 0.5이었고, 에폭시수지 종류에 따라 12종류의 지방산 변성 에폭시수지가 합성되었다. 합성된 지방산 변성 에폭시수지에 대하여 점도 및 용매${\surd}$가용성을 평가한 결과, 벤젠고리와 글리시딜기의 함량 및 알킬기의 탄소수가 증가할수록 약용매에 대한 용해성이 우수한 것으로 나타났다. 또한 약용매에 용해성이 우수한 지방산 변성 에폭시수지를 사용하여 투명 도료를 제조하여 물성을 평가한 결과, 비스페놀A형 에폭시수지/지방산/DP/TDI의 당량비가 1.0/0.25/0.25/0.5인 것과 페놀 노볼락형 에폭시수지/지방산/DP의 당량비가 1.0/0.25/0.25인 조성에서 건조시간, 접착력, 도막경도, 내충격성, 내알칼리성에서 양호한 물성을 나타내었다.

Keywords

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