Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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A Study on the Cleanliness Evaluation Methods for the Selection of Alternative Cleaning Agents

대체 세정제의 선정을 위한 세정성 평가방법 연구

  • Shin, Jin-Ho (Department of Chemical and Biochemical Engineering, The University of Suwon) ;
  • Lee, Jae-Hoon (Department of Chemical and Biochemical Engineering, The University of Suwon) ;
  • Bae, Jae-Heum (Department of Chemical and Biochemical Engineering, The University of Suwon) ;
  • Lee, Min-Jae (Department of Chemical and Biochemical Engineering, The University of Suwon) ;
  • Hwang, In-Gook (Department of Chemical and Biochemical Engineering, The University of Suwon)
  • 신진호 (수원대학교 화공생명공학과) ;
  • 이재훈 (수원대학교 화공생명공학과) ;
  • 배재흠 (수원대학교 화공생명공학과) ;
  • 이민재 (수원대학교 화공생명공학과) ;
  • 황인국 (수원대학교 화공생명공학과)
  • Published : 2009.06.30
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Abstract

In this study various cleaning evaluation methods were tested and comparatively evaluated to help cleaning industry. In order to select alternative cleaning agents objectively and systematically, various cleaning evaluation methods such as gravimetric, optically simulated electron emission (OSEE), contact angle, and analytical instrument methods were employed for cleaning contaminants such as flux, solder and grease. The analytical instruments used in this work were Fourier transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV-VIS) and high performance liquid chromatography (HPLC). The gravimetric method was able to measure cleaning efficiencies easily and simply, but it was not easy to analyze them precisely because of its limitation in the gravimetric measurement. However, the OSEE technique was able to measure quickly and precisely the clean ability of cleaning agents in comparison with the gravimetric method. The contact angle method was found to be necessary for taking special precaution in its application to the cleaning evaluation due to possible formation of tiny organic film on the substrate surface which might be generated from contaminants and cleaning agents. In case of precision analysis that cannot be done by gravimetric method, fine analytical instruments such as UV-VIS, FTIR and HPLC could be used in analyzing trace amount of flux, solder and grease quantitatively, which were extracted from the surface by special solvents.

본 연구에서는 산업체에서 대체 세정제를 객관적이고 체계적으로 선정하는데 도움을 주고자 여러 가지 세정성 평가방법을 실험을 통하여 비교 평가하였다. 세정성 평가방법으로는 중량법, OSEE (optically simulated electron emission)법, 접촉각법과 FTIR, UV-VIS, HPLC와 같은 정밀분석기기를 이용한 분석법을 사용하여 flux, solder, grease 등의 오염물질에 대한 세정성 평가를 수행하였다. 그 결과 중량법은 쉽고 간단하게 세정제의 세정효율을 측정할 수 있었지만 중량측정의 한계로 정밀측정이 어려웠다. 반면에 OSEE법은 세정제의 세정성 평가를 빠르고 정밀하게 수행할 수 있었다. 접촉각 측정법은 피세정물 표면에 오염물질과 세정제에 의한 얇은 친유성 막의 형성으로 인하여 접촉각 변화에 영향을 주기 때문에 세정성 평가에 특별한 주의가 요구되었다. 중량법으로 수행하기 어려운 정밀세정성 평가의 경우 UV-VIS, FTIR, HPLC와 같은 정밀분석기기를 이용하여 피세정물에 잔류한 flux, solder, grease 등의 극미량의 오염물을 특수 용제로 추출하여 아주 작은 농도의 오염물을 정량분석할 수 있었다.

Keywords

References

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