Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic sulfur compound – wherein the sulfur is single bonded...
Patent
1997-12-19
1999-07-27
Lovering, Richard D.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic sulfur compound, wherein the sulfur is single bonded...
516 25, 516 66, 516909, 562 94, C10M13510, C10M17300, B01F 1712, B01J 1300
Patent
active
059290030
DESCRIPTION:
BRIEF SUMMARY
The present Invention relates to the use of salts of alkyl aryl sulphonic acids as emulsifiers in oil water systems in which the alkyl group of the aryl sulphonic acid is derived from one or more normal olefines and the molecular weight of the alkyl aryl sulphonic acid is greater than 530.
The sulphonic acids may be neutralised to form sulphonates for use as an emulsifier or in oil recovery the cation will generally be an alkali metal or a quaternary nitrogenic cation.
Emulsified oils are now used in a large number of machining operations due to an industry demand for higher production rates, lower costs, improved environmental conditions and better operator acceptance. Emulsions are generally used where cooling is more important than lubrication. In operations such as broaching, deep drilling, or where surface finish is particularly critical, neat oils may still be used, but the development of extreme pressure additives in emulsions has increased their applicability and use.
The emulsions are generally prepared from emulsifiable oils supplied to the final user for incorporation into the water. The emulsifiable oils frequently contain additives which can be supplied as an additive package, formulation or concentrate to the producer of the emulsifiable cutting oil.
Amongst the various types of fluids, there is a marked trend towards those having an optimised combination of lubricating, cooling and long-life properties. Such fluids are obtained by micro-emulsification of a base oil formulated with anti-corrosion and biostability agents. The micro-emulsion type of cutting fluid has good stability due to the very small size of their hydrocarbon droplets which do not tend to coalesce during storage. This feature is a key advantage over conventional fluids forming white emulsion whose hydrocarbon droplet size is much larger, where formulation with water-soluble biostability agents is difficult.
Aqueous metal working fluids have been known for many years and different additives have been developed to provide oils useful for different types of metal working and for use with different types of water.
Various emulsifiers have been proposed for the production of water in oil and oil in water emulsions. Typical emulsifiers are the sulphonates, such as the natural and synthetic petroleum sulphonates and the synthetic alkyl aryl sulphonates, such as the C.sub.12 -C.sub.24 alkyl benzene and toluene sulphonates and mixtures thereof as described in United Kingdom patent specification 1476891. These sulphonates are typically derived from sulphonic acids which have average molecular weights of 530 or less.
The aqueous metal working fluids may be water in oil emulsions or oil in water emulsions, largely depending upon whether lubrication or cooling is the more important. We are, however, particularly concerned with the currently more popular oil in water emulsion cutting fluids such as microemulsions and white or milky emulsions.
The additives may be supplied to a producer of emulsifiable oils or to the producer of the aqueous fluids. In either instance they may be supplied as a solution or an emulsion of the sulphonates together with other additives for incorporation into oil or the bulk of the water. The solution may be in oil or water and if in oil it will generally contain some water.
The emulsifiable oil supplied to the final user may contain other emulsifiers to enable the production of oil in water or water in oil emulsions and, the choice depending upon the nature of the oil and the type of emulsion required. Alternatively the final user may introduce the emulsifier into the fluid separately. Salts of the synthetic alkyl benzene sulphonic acids, particularly the mixtures which-form the subject of United Kingdom Patent No. 1476891 are our preferred co-emulsifier, other suitable emulsifiers are the sulphonamide carboxylates such as those described in French Patent 2403396 and the sulphonates described in European Patent Application 0015491.
We have found that by using sulphonic acids of high molecular weight with alkyl
REFERENCES:
patent: 1901506 (1933-03-01), Gunther
patent: 1970687 (1934-08-01), Brooks
patent: 2388677 (1945-11-01), Cohen
patent: 2680716 (1954-06-01), Lipkin et al.
patent: 3714062 (1973-01-01), Askew et al.
patent: 4089788 (1978-05-01), McCarthy
Exxon Chemical Patents Inc.
Lovering Richard D.
LandOfFree
Synthetic emulsifiers and their use does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Synthetic emulsifiers and their use, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synthetic emulsifiers and their use will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-878562