To obtain a water dissolver which has excellent water extracting performances and improves lubricating performances even when used in LS light oil by adding a lubrication improver to a water dissolver.
The lubrication improver used is a mono-fatty acid, a fatty acid ester or an amine compound and is used in an amount of desirably 0.001-10 vol. pts. per 100 pts. vol. water dissolver. Further, it is desirable that it contain 0.1-1.0 pt. vol. rust preventive. It is exemplified by an amine salt of benzotriazole or an amine salt of benzoic acid and exhibits rust-preventive effect on metals such as steel, copper and aluminum. The water dissolver contains a solvent such as a hydrocarbon oil or an oxygenated compound as the base. By virtue of its especially its high water extracting performances, a combination of isobutanol with butyl cellosolve is desirable. The mixing ratio is for example such that 1-3 pts. vol. lubrication improver, 97-98 pts. vol. rust solvent and 0.4-0.5 pt. vol. preventive are added to 100 pts. vol. water dissolver. Further, it is also possible to add a corrosion inhibitor, a surfactant, etc., thereto.
OGURA HIROSHI
UMEZAWA YOSHIAKI
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