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세정제에서 Abietic Acid의 용해도 예측

Prediction of Solubility of Abietic Acid in Cleaning Solvent

HWAHAK KONGHAK, December 1993, 31(6), 623-627(5), NONE
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Abstract

몬트리올의정서에 의하여 오존층 파괴물질로 규정된 전자산업의 필수불가결한 세정제인 CFC 113 (1,1,2-trich-loro 1,2,2-trifluoroethane)의 사용이 앞으로 규제가 됨에 따라서 대체세정제의 개발이 활발히 진행되고 있다. 세정제로서 갖추어야할 가장 중요한 성질인 오염물질을 용해시키는 용해도를 Scatchard-Hildebrand relation에서의 용질의 활동도계수와 용해도 매개변수를 이용하여 이론적으로 구하였다. 전자산업에서 인쇄회로기판의 납땜전에 사용하는 로진계 flux의 주성분인 비극성 abietic acid를 오염물질로 정하고 세정제로서는 CFC 113을 비롯하여 water, acetonitrile, methanol, IPA, acetone, d-limonene, trichloroethylene, 1,1,1-trichloroethane, chloroform, methylene chloride, carbon tetrachloride, perchloroethylene을 사용하였다. 각 세정제에서의 몰용해도와 abietic acid의 요융열 8831cal/g-mol을 비선형 회귀방법으로 구하였다. 계산결과에 의하면 극성용매(water, acetonitrile, methanol)에 대한 몰용해도는 Scatchard-Hildebrand relation을 적용할 수 없으나 그밖의 비극성용매에 대한 몰용해도는 실험값과 비교한 결과 비교적 잘 일치하였다.
According to the Montreal Protocol, CFC 113(1,1,2-trichloro 1,2,2-trifluoroethane), one of the ozone-depleting substances, will be prohibited to use as a cleaning solvent essentially in the electronic indus-try. Therefore, the development of the alternative cleaning solvents to CFC 113 is being accelerated. As one of the min characteristics of solvents, the solubility is theoreticall;y calculated using the activity coefficient of solute from Scatchard-Hildebrand relation and the solubility parameters. Abietic acid is a major constituent of the rosin-based flux used for PCB sodering, and is esignated as a contaminant. The cleaning solvents used in this work include water, acetonitrile, methanol, IPA, acetone, d-limonene, trichloroethylene, 1,1,1-trichloroethane, chloroform, methylene chloride, carbon tetrachloride, perchloroethylene as well as CFC 113. By use of a non-linear regression technique, the mole fraction solubilities are calculated and the heat of fusion of abietic acid is found to be 8831cal/g-mol. The results show that for the polar solvents(water, acetonitrile and methanol), the mole fraction solubility can not be calculated using the Scatchard-Hildebrand relation, but for the other nonpolar solvents, the agreements between the calculated and the experimental solubilities are relatively good.

Keywords

References

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