Water based food grade hydraulic fluid

Abstract

A food grade lubricant composition particularly useful for hydraulic oils, gear oils, and compressor oils for equipment used in the food processing and packaging industry having a composition: (a) propylene glycol; (b) water (preferably deionized), (c) high ethyl PAG polymer; (d) capric acid; (e) potassium hydroxide; and, (f) amine phosphate and a method of formulating the composition. In addition a method of lubricating surfaces of the machinery used for processing or packaging food, food packaging materials, or other materials related to the food processing industry including the step of applying the formulation composition to the surfaces of the food processing or packaging machinery.

What is claimed is: 
     
         1 . A water based food grade hydraulic fluid, comprising:
 24-53% wt. USP propylene glycol;   35-45% wt. deionized water,   12-25% wt. high ethylene PAG polymer;   0-3% wt. capric acid;   0-2% wt. potassium hydroxide;   0-1% wt. amine phosphate.   
     
     
         2 . The water based food grade hydraulic fluid of  claim 1  wherein said high ethyl PAG polymer is 90K to 400K SUS at 100° F. 
     
     
         3 . A method of preparing a water based food grade hydraulic fluid of the composition set forth in  claim 1  above. 
     
     
         4 . A water based food grade hydraulic fluid, comprising
 44.85% wt USP propylene glycol;   36.75% wt deionized water,   15.4% wt high ethyl PAG polymer;   1.625% wt. capric acid;   1.175% wt. potassium hydroxide;   0.2% wt. amine phosphate.   
     
     
         5 . The water based food grade hydraulic fluid of  claim 4  wherein said high ethyl PAG polymer is 90K to 400K SUS at 100° F. 
     
     
         6 . A method of lubricating surfaces of machinery used for processing or packaging food, food packaging materials, or other materials related to the food processing industry, which method comprises the step of applying to the surfaces of the food processing or packaging machinery a water based food grade hydraulic fluid composition comprising:
 44.85% wt USP propylene glycol;   36.75% wt deionized water,   15.4% wt high ethyl PAG polymer;   1.625% wt. capric acid;   1.175% wt. potassium hydroxide;   0.2% wt. amine phosphate.   
     
     
         7 . The method of  claim 6  wherein said high ethyl PAG polymer is 90K to 400K SUS at 100° F.