Hot rolling process for rolling aluminium and aluminium alloys sheets

Abstract

The present invention relates to a hot rolling process for rolling aluminium and aluminium alloys sheets, comprising applying an effective amount of an oil-in-water emulsion comprising water and a water-soluble oil composition comprising a base stock oil and, based on the total weight of the water-soluble oil composition, from 1 to 80% by weight of di(2-ethylhexyl) adipate ester. The invention also relates to a water-soluble aluminium and aluminium hot rolling oil composition, to an oil-in water emulsion prepared therewith and to the use of said oil-in-water emulsion in a hot rolling process.

1 . Hot rolling process for rolling aluminium and aluminium alloys sheets, comprising applying an effective amount of an oil-in-water emulsion comprising water and a water-soluble oil composition comprising a base stock oil and, based on the total weight of the water-soluble oil composition, from 1 to 80% by weight of di(2-ethylhexyl) adipate ester.  
     
     
         2 . Hot rolling process according to  claim 1 , wherein the water-soluble oil composition further comprises, based on the total weight of the composition, from 0,05 to 20%, preferably from 0,1 to 5% by weight of a non-ionic surfactant, preferably an ethylene oxide addition polymer.  
     
     
         3 . Hot rolling process according to  claim 1  or  2 , wherein the water-soluble oil composition comprises, based on the total weight of the composition, from 3 to 30% by weight of di(2-ethylhexyl) adipate ester.  
     
     
         4 . Hot rolling process according to any one of  claims 1  to  3 , wherein the water-soluble oil composition further comprises, based on the total weight of the composition, from 1 to 30%, preferably from 5 to 20% by weight of oleic acid.  
     
     
         5 . Hot rolling process according to any one of  claims 1  to  4 , wherein the water-soluble oil composition further comprises a trialkanolamine (C 2-4 ), preferably triethanolamine, in such an amount that all bindable trialkanolamine is bound to a part of the oleic acid.  
     
     
         6 . Hot rolling process according to any one of  claims 1  to  5 , wherein the oil-in-water emulsion comprises water and from 0.5 to 30%, preferably from 1 to 15% (v/v) of said water-soluble oil composition.  
     
     
         7 . Hot rolling process according to any one of  claims 1  to  6 , wherein the hot rolling process is carried out in a breakdown mill and the emulsion comprises, based on the total volume of the emulsion, from 2 to 4% by volume of said water-soluble oil composition.  
     
     
         8 . Hot rolling process according to  claim 11 , wherein the hot rolling process is carried out in a finishing or tandem mill and the emulsion comprises, based on the total volume of the emulsion, from 5 to 7% by volume of said water-soluble oil composition.  
     
     
         9 . Water-soluble aluminium and aluminium alloys hot rolling oil composition comprising, in weight percentages based on the total weight of the composition: 
 0.1-0.5% of trialkyl (C 1-4 ) phenol;    0.5-4.0% of trialkyl (C 3-10 ) phosphate ester;    5-15% of di(2-ethylhexyl) adipate ester;    5-15% of organic fatty acid (C 12-20 );    0.5-2% of 5-carboxy 4-hexyl 2-cyclohexen 1-octanoic acid;    1-3% of alkylene (C 2-6 )glycol;    0.3-1% of ethoxylated alcohols (C 5-14 , comprising 2-10 CH 2 O groups);    2-5% of trialkanol amine (C 2-4 );    the balance being a mixture of naphthenic and paraffinic lube base oils.    
     
     
         10 . Water-soluble oil composition according to  claim 9 , in which the base stock oil has a viscosity comprised between 7 and 150 cSt at 40° C., preferably between 20 and 50 cSt at 40° C.  
     
     
         11 . Process for the preparation of a water-soluble oil composition according to  claim 9  or  10 , comprising blending the base stock and the other ingredients under stirring or with any mixing device.  
     
     
         12 . Oil-in-water emulsion comprising water and from 0.5 to 30%, preferably from 1 to 15% (v/v) of the water-soluble oil composition according to  claim 9  or  10 .  
     
     
         13 . Process for the preparation of an oil-in-water emulsion according to  claim 12 , comprising diluting the oil composition in water under stirring.  
     
     
         14 . Use of the water-soluble oil composition according to claims  9  or  10  to prepare emulsions intended to be used in a aluminium or aluminium alloy hot rolling process.  
     
     
         15 . Use of the water-in-oil emulsion of  claim 12  in a hot rolling process.