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Annals of Occupational Hygiene Advance Access originally published online on January 7, 2005
Annals of Occupational Hygiene 2005 49(4):283-293; doi:10.1093/annhyg/meh092
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© 2005 British Occupational Hygiene Society Published by Oxford University Press;

Original Article

Mist Generation from Metalworking Fluids Formulated Using Vegetable Oils

PETER C. RAYNOR1,*, SEUNG WON KIM1 and MRINAL BHATTACHARYA2

1 Division of Environmental Health Sciences, University of Minnesota, Mayo Mail Code 807, 420 Delaware Street SE, Minneapolis, MN 55455, USA; 2 Department of Biosystems and Agricultural Engineering, University of Minnesota, 1390 Eckles Avenue, St Paul, MN 55122, USA

* Author to whom correspondence should be addressed. E-mail: praynor{at}umn.edu

ABSTRACT

Metalworking fluid emulsion formulations produced from vegetable oils may be less toxic and may reduce disposal costs when compared with fluids formulated with petroleum-based oils. Experiments were performed on experimental emulsions made with unmodified and modified soybean oils to measure rates of mist production by impaction, centrifugal force and evaporation/recondensation mechanisms. Results were compared with measurements made using a commercial metalworking fluid emulsion formulated using vegetable oil and another made from mineral oil. The results indicated that most of the experimental fluids produced about the same amount of mist as the commercial fluids by impaction and more mist than the petroleum-based fluid by centrifugal force. However, an air-oxidized modified soy oil produced less mist by impaction than the petroleum-based fluid and about the same by centrifugal force. The experimental fluids produced between 30 and 90% less mist than the commercial fluids by evaporation/recondensation. The air-oxidized soybean oil was the most promising candidate among the experimental fluids for further testing in more realistic machining conditions.

Keywords: centrifugal force • evaporation • impaction • metalworking fluids • mist • vegetable oils


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