Patent ID: 7700526
Filing Date: 2010-04-20
Classification: C10M,C10N

Abstract:
1. A stable water-dilutable emulsion lubricant for machining, comprising: an oil system and a water system, said oil system being emulsified as droplets in the water system using an emulsifier, said oil system comprising droplets of a base oil and an effective amount of fine particles of boron nitride of a crystalline turbostratic structure, said fine particles of boron nitride being carried by said base oil system droplets, said oil system droplets carrying said fine particles of boron nitride prior to dispersion in the water system, wherein said oil system droplets have an average particle size of less than 2 μm, with an average primary particle size of primary particles of said fine particles of boron nitride being not larger than 1 μm, said oil system droplets are obtained by dispersing said fine particles of boron nitride in a base oil and pulverizing the mixture, and emulsifying the mixture with an aqueous solution in the presence of an emulsifier to produce the stable water-dilutable emulsion lubricant, the stable water-dilutable emulsion lubricant being substantially free of precipitation of the fine particles of boron nitride, and having an oil to water ratio calculated by dividing an amount of the base oil by weight with an amount of water by weight of between about 0.63 and about 1.