Multifunctional lubricant additive
AssigneeNCH Corporation
InventorsRuiming Zhang, Robert M. Hooks
Life of this patent
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Abstract
The multifunctional lubricant additive compositions of the invention preferably contain a methylene bis(dibutyldithiocarbamate) as an antiwear and extreme pressure additive, a 2,5-dimercapto-1,3,4-thiadiazole derivative as an antioxidant and antiwear additive, a tolutriazole compound as an antioxidant and corrosion inhibitor, a glycerol monooleate as a friction modifier, a calcium sulfonate as a detergent and extreme pressure additive, a zinc dialkyl dithiophosphate as an antiwear and antioxidant additive, a polymethylacrylate as a dispersant, a polyol ester as a carrier and friction modifier, a red dye for leak detection, and optionally, solvent neutral oil and a pour point depressant.
Claims26
A multifunctional lubricant additive comprising from about 2 to about 16 weight percent methylene bis(dibutyidithiocarbamate), from about 2 to about 16 weight percent 2,5-dimercapto-1,3,4-thiadiazole derivative, from about 2 to about 16 weight percent of a tolutriazole compound, from about 2 to about 16 weight percent glycerol monooleate, from about 2 to about 16 weight percent zinc alkyldithiophosphate, from about 0.4 to about 3.2 weight percent calcium sulfonate, from about 0.25 to about 3 weight percent acrylic copolymer, and from about 20 to about 60 weight percent of a polyol ester.
A multifunctional lubricant additive comprising about 50 wt. % solvent neutral oil;
- about 28 wt. % polyol ester;
- about 4 wt. % each of zinc C.sub.1 -C.sub.14 alkyldithiophosphate, a tolutriazole compound in ester solvent, a 2,5-dimercapto-1,3,4-thiadiazole derivative, glycerol monooleate, and methylene bis(dibutyidithiocarbamate);
- and the remainder of minor effective amounts less than about 1 wt. % each of calcium sulfonate, poly(alkyl methacrylate), a pour point depressant and oil red dye.
A multifunctional lubricant additive comprising about 57 wt. % polyol ester;
- about 8 wt. % each of zinc dialkyl dithiophosphate, a tolutriazole compound in petroleum process oil, a 2,5-dimercapto-1,3,4-thiadiazole derivative, glycerol monoleate, and methylene bis(dibutyidithiocarbamate);
- minor effective amounts less than about 2 wt. % each of calcium sulfonate and poly(alkyl methacrylate);
- and a minor effective amount less than about 0.01 wt. % oil red dye.
A lubricant containing an additive comprising from about 20 to about 60 wt. % polyol ester, from about 2 to about 16 wt. % zinc C.sub.1 -C.sub.14 alkyldithiophosphate, from about 2 to about 16 wt. % tolutriazole compound, from about 2 to about 16 wt. % 2,5-dimercapto-1,3,4-thiadiazole derivative, from about 2 to about 16 wt. % methylene bis(dibutyidithiocarbamate), from about 2 to about 16 wt. % glycerol monooleate, from about 0.4 to about 3.2 wt. % calcium sulfonate, from about 0.25 to about 3 wt. % poly(alkyl methacrylate), from 0 to about 50 wt. % solvent neutral oil, from 0 to about 0.6 wt. % pour point depressant, and from 0 to about 0.02 wt. % dye.
A method for improving the physical properties and service life of a lubricant comprising the step of mixing therewith an additive comprising from about 20 to about 60 wt. % polyol ester, from about 2 to about 16 wt. % zinc C.sub.1 -C.sub.14 alkyldithiophosphate, from about 2 to about 16 wt. % tolutriazole compound, from about 2 to about 16 wt. % 2,5-dimercapto-1,3,4-thiadiazole derivative, from about 2 to about 16 wt. % methylene bis(dibutyldithiocarbamate), from about 2 to about 16 wt. % glycerol monooleate, from about 0.4 to about 3.2 wt. % calcium sulfonate, from about 0.25 to about 3 wt. % poly(alkyl methacrylate), from 0 to about 50 wt. % solvent neutral oil, from 0 to about 0.6 wt. % pour point depressant, and from 0 to about 0.02 wt. % dye.
Dependencies are inferred from the claim text.