| abstract |
A lubricant for machinery comprises in admixture, water as a major constituent, a pour-point depressant in an amount of up to 15% and a corrosion inhibitor in an amount of 25%. The corrosion inhibitor may be selected from triethanolamine, phosphoric acid, benzotriazole, sodium borate, hydrazine hydrate and a hydraulic concentrate. A suitable hydraulic concentrate contains:- sodium nitrate 3% sodium acetate 3% triethanolamine 2.8% heavy metal akyl sulphonates 8% silicone based foam inhibitor 0.2% water hardness inhibitor 0.2% Polyhydric alcohols C2-C15 are useful pour-point depressants. Further an additive for admixture with water to form a lubricant comprises monoethylene glycol and any of the above corrosion inhibitors. |