Greases oxidation properties

In the other market areas, lead naphthenates are used on a limited basis in extreme pressure additives for lubricating oils and greases. Sodium and potassium naphthenates are used in emulsiftable oils, where they have the advantage over fatty acid soaps of having improved disinfectant properties. Catalyst uses include cobalt naphthenate as a cross-linking catalyst in adhesives (52) and manganese naphthenate as an oxidation catalyst (35). Metal naphthenates are also being used in the hydroconversion of heavy petroleum fractions (53,54) and bitumens (55). 

Chlorosulfouated polyethylene (Hypalou) 250 Excellent resistance to oxidizing chemicals, ozone, weathering. Relatively good resistance to oils, grease. Poor resistance to aromatic or chlorinated hydrocarbons. Good mechanical properties. 

There is a general tendency for wear to be reduced in molybdenum disulphide greases, but the improvement is not as great nor as consistent as for load-carrying capacity. Friction is also generally lower. The effects on physical and chemical properties of greases are more complicated, and addition of molybdenum disulphide has been shown to affect the stability of the gel structure, the oxidation resistance and the corrosion resistance. 

These equilibrated silicone oils have valuable properties they are very stable to heat and oxidation, they have good electrical properties, and are water-repellent. They find application as vacuum oils and greases, water-proofing agents, and paint media. 

The effective life of grease, especially under high-temperature conditions, is dependent on such factors as oxidation, retentive properties, and evaporation of the base oil. Evaporation of the oil can result in the grease becoming stiffer and drier and can ultimately lead to bearing failure. 

Another important class of nonionics are amine oxides, such as DMDAO (dimethyldodecyl amine oxide) and CAPAO (cocoamidopropyldimethyl amine oxide). This type of surfactant is nonionic at pH values above its pKa and cationic below that point. When functioning as a nonionic, amine oxides have many useful properties. They interact strongly with anionics which can result in performance benefits [17]. Amine oxides help to mitigate anionic surfactant irritation, act as foam stabilizers, and can also function to improve grease removal. 

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