METHOD OF SELECTING DETERGENT COMPOSITION FROM ORGANIC SOLVENTS Russian patent published in 1997 - IPC

FIELD: detergents. SUBSTANCE: invention relates to cleansing metal optical parts from unknown-type impurities. In order to choose appropriate cleansing composition from organic solvents, one successively treats the surface of a check test piece with the same type of contaminant with solvents from homologous series of alifatic alcohols according to diminishing physical parameter δ expressing specific cohesion energy of a corresponding solvent. Then quality of cleansing of treated surface is determined. Such operations are repeated until parameter d is reached that immediately follows after extreme value d₁. Then Δδ value is determined for cleanseable type of contamination, which is difference between two d values for solvents treatment with which provides two nearest to extreme values. According to found Dd value, one chooses organic solvents pertaining to other classes and having d values lying in the range determined by found Dd value. Alcohol with d₁ value is combined with at least one solvent chosen from another class of organic solvents, and obtained detergent composition is homogenized. As another-class solvent, such one is chosen that forms azeotrope mixture with the solvent possessing δ₁ parameter. So organic solvents are mixed in azeotrope proportion. EFFECT: enhanced efficiency of detergent compositions. 3 cl, 1 tbl