Paper machine lubricant compositions with mixed basestock oils

Abstract

Provided are paper machine lubricating compositions and methods of operating a paper machine with said paper machine lubricating compositions, where the paper machine lubricating compositions comprise about 20 wt % to about 80 wt % of a first oil basestock, wherein the first oil basestock comprises an API group II extra heavy neutral basestock, and about 2 wt % to about 40 wt % of a second oil basestock, wherein the second oil basestock comprises an API group I, an API group II, an API group IV basestock, or any combination thereof, where the API group II extra heavy neutral basestock has: a kinematic viscosity (ASTM D445, 40° C.) of 320 cSt to 520 cSt, a kinematic viscosity (ASTM D445, 100° C.) of 22 cSt to 36 cSt, a viscosity index (ASTM D2270) of 80 to 119, a pour point (ASTM D97) of −6° C. or less, and a saturate content (ASTM D7419) of 90 wt % or greater; and wherein the second oil basestock has a kinematic viscosity (ASTM D445, 40° C.) of 3 cSt to 50 cSt.

What is claimed is: 
     
         1 . A paper machine lubricating composition comprising:
 about 20 wt % to about 80 wt % of a first oil basestock, wherein the first oil basestock comprises an API group II extra heavy neutral basestock, and wherein the API group II extra heavy neutral basestock has:
 a kinematic viscosity (ASTM D445, 40° C.) of 320 cSt to 520 cSt, 
 a kinematic viscosity (ASTM D445, 100° C.) of 22 cSt to 36 cSt, 
 a viscosity index (ASTM D2270) of 80 to 119, 
 a pour point (ASTM D97) of −6° C. or less, and 
 a saturate content (ASTM D7419) of 90 wt % or greater; and 
   about 2 wt % to about 40 wt % of a second oil basestock, wherein the second oil basestock comprises an API group I, an API group II, an API group IV basestock, or any combination thereof, and wherein the second oil basestock has a kinematic viscosity (ASTM D445, 40° C.) of 3 cSt to 50 cSt.   
     
     
         2 . The paper machine lubricating composition of  claim 1 , wherein the second oil basestock comprises an API group IV basestock. 
     
     
         3 . The paper machine lubricating composition of  claim 1 , wherein the second oil basestock comprises a polyalphaolefin. 
     
     
         4 . The paper machine lubricating composition of  claim 1 , further comprising about 2 wt % to about 30 wt % of a third oil basestock, wherein the third oil basestock comprises an API group V basestock. 
     
     
         5 . The paper machine lubricating composition of  claim 4 , wherein the third oil basestock comprises alkylated naphthalene. 
     
     
         6 . The paper machine lubricating composition of  claim 1 , further comprising about 2 wt % to about 10 wt % of a performance additive package, the performance additive package comprising:
 about 0.01 wt % to 0.1 wt % of a defoamant, about 0.01 wt % to 0.1 wt % of a metal passivator, about 0.01 wt % to 0.2 wt % of an antiwear agent, about 0.1 wt % to 0.5 wt % of an antioxidant, about 0.01 wt % to 1.0 wt % of a rust inhibitor, about 0.1 wt % to 5.0 wt % of a dispersant, or any combination thereof;   wherein weight percentages are based on a total weight of the lubricating composition.   
     
     
         7 . The paper machine lubricating composition of  claim 1 , wherein the second oil basestock has a kinematic viscosity (ASTM D445, 40° C.) of 10 cSt to 50 cSt. 
     
     
         8 . The paper machine lubricating composition of  claim 1 , wherein the paper machine lubricating composition has a viscosity (ASTM D445, 40° C.) of 150 cSt to 320 cSt. 
     
     
         9 . The paper machine lubricating composition of  claim 1 , wherein the paper machine lubricating composition has a viscosity (ASTM D445, 40° C.) of 200 cSt to 240 cSt. 
     
     
         10 . The paper machine lubricating composition of  claim 1 , wherein the paper machine lubricating composition conforms to ISO Viscosity Grade (VG) 220, or ISO VG 150, ISO VG 320, or ISO VG 460. 
     
     
         11 . The paper machine lubricating composition of  claim 1 , wherein the lubricating composition conforms to an ISO Viscosity Grade (VG) 220. 
     
     
         12 . The paper machine lubricating composition of  claim 1 , wherein the lubricating composition has a Bearing Rig Test (BRT) average Varnish Score of 5.2 or greater. 
     
     
         13 . The paper machine lubricating composition of  claim 1 , wherein the lubricating composition has a Bearing Rig Test (BRT) average Sludge Score of 9.5 or greater. 
     
     
         14 . A method comprising:
 operating a paper machine with a lubricating composition comprising:   about 20 wt % to about 80 wt % of a first oil basestock, wherein the first oil basestock comprises an API group II extra heavy neutral basestock, and wherein the API group II extra heavy neutral basestock has:
 a kinematic viscosity (ASTM D445, 40° C.) of 320 cSt to 520 cSt, 
 a kinematic viscosity (ASTM D445, 100° C.) of 22 cSt to 36 cSt, 
 a viscosity index (ASTM D2270) of 80 to 119, 
 a pour point (ASTM D97) of −6° C. or less, and 
 a saturate content (ASTM D7419) of 90 wt % or greater; and 
   about 2 wt % to about 40 wt % of a second oil basestock, wherein the second oil basestock comprises an API group I, an API group II, an API group IV basestock, or any combination thereof, and wherein the second oil basestock has a kinematic viscosity (ASTM D445, 40° C.) of 3 cSt to 50 cSt.   
     
     
         15 . The method of  claim 14 , wherein the lubricating composition experiences temperatures of 30° C. to 200° C. within the paper machine. 
     
     
         16 . The method of  claim 14 , wherein the second oil basestock comprises an API group IV basestock. 
     
     
         17 . The method of  claim 14 , wherein the second oil basestock comprises a polyalphaolefin. 
     
     
         18 . The method of  claim 14 , wherein the lubricating composition further comprises about 2 wt % to about 30 wt % of a third oil basestock, wherein the third oil basestock comprises an API group V basestock. 
     
     
         19 . The method of  claim 18 , wherein the third oil basestock comprises alkylated naphthalene. 
     
     
         20 . The method of  claim 14 , wherein the lubricating composition further comprises about 2 wt % to about 10 wt % of a performance additive package, the performance additive package comprising:
 about 0.01 wt % to 0.1 wt % of a defoamant, about 0.01 wt % to 0.1 wt % of a metal passivator, about 0.01 wt % to 0.2 wt % of an antiwear agent, about 0.1 wt % to 0.5 wt % of an antioxidant, about 0.01 wt % to 1.0 wt % of a rust inhibitor, about 0.1 wt % to 5.0 wt % of a dispersant, or any combination thereof;   wherein weight percentages are based on a total weight of the lubricating composition.   
     
     
         21 . The method of  claim 14 , wherein the second oil basestock has a kinematic viscosity (ASTM D445, 40° C.) of 10 cSt to 50 cSt. 
     
     
         22 . The method of  claim 14 , wherein the lubricating composition has a viscosity (ASTM D445, 40° C.) of 150 cSt to 320 cSt. 
     
     
         23 . The method of  claim 14 , wherein the lubricating composition has a viscosity (ASTM D445, 40° C.) of 200 cSt to 240 cSt. 
     
     
         24 . The method of  claim 14 , wherein the lubricating composition conforms to ISO Viscosity Grade (VG) 220, or ISO VG 150, ISO VG 320, or ISO VG 460. 
     
     
         25 . The method of  claim 14 , wherein the lubricating composition conforms to an ISO Viscosity Grade (VG) 220. 
     
     
         26 . The method of  claim 14 , wherein the lubricating composition has a Bearing Rig Test (BRT) average Varnish Score of 5.2 or greater. 
     
     
         27 . The method of  claim 14 , wherein the lubricating composition has a Bearing Rig Test (BRT) average Sludge Score of 9.5 or greater.