Synthesis and Anti-corrosion Properties of Succinic Acid Alkyl Half-Ester Derivatives

숙신산 알킬 하프-에스테르 유도체의 합성 및 해수에 대한 방청성능

  • Baek, Seung-Yeob (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology) ;
  • Kim, Young-Wun (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology) ;
  • Chung, Keun-Wo (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology) ;
  • Yoo, Seung-Hyun (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology)
  • 백승엽 (한국화학연구원 그린화학연구단 산업바이오화학연구센터) ;
  • 김영운 (한국화학연구원 그린화학연구단 산업바이오화학연구센터) ;
  • 정근우 (한국화학연구원 그린화학연구단 산업바이오화학연구센터) ;
  • 유승현 (한국화학연구원 그린화학연구단 산업바이오화학연구센터)
  • Received : 2011.03.03
  • Accepted : 2011.04.25
  • Published : 2011.08.10

Abstract

Succinic acid ester derivatives have been used as additives for the base oil of metal working fluids and pressure working oils. In this paper, a series of succinic acid alkyl half-esters were synthesized with over 97% yields by ring-opening reaction of succinic anhydride and fatty alcohol and were soluble in 100 N base oil within 1 wt% concentration. The structures and purities of ester derivatives were confirmed by $^1H-NMR$ and FT-IR spectrum and GC analysis. Anti-corrosion properties of the esters in sea water were evaluated through ASTM D665 method and weight loss method and compared to that of succinic alkyl esters without carboxylic acid group in the molecule. As the results, anti-corrosion properties of succinic acid alkyl half-esters with carboxylic acid group were better than those of succinic acid alkyl esters without carboxylic acid group. And, Anti-corrosion properties of the esters with a shorter alkyl chain of high concentration showed better performance than those with longer alkyl chain of low concentration. Inhibition efficiency % (IE%) of the esters was over 95% in the concentration of 80 ppm and corrosion rate (CR) was below 0.3 mm/year at the same concentration. Thus, the corrosion properties of succinic acid alkyl half-esters result from the carboxylic acid groups in molecules.

Acknowledgement

Grant : 숙신산계 정밀화학중간체 제조 및 응용기술개발

Supported by : 지식경제부

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