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Changes to lithium grease after addition of antioxidants

Issuing time:2022-11-22 07:25Author:YIRUNDE GREASE

The importance of antioxidant in lithium based grease is very key, it will improve the quality of grease. There are many kinds of antioxidants of common lithium grease, so that grease manufacturers have several kinds of selection, can produce a variety of high temperature lithium based grease extreme pressure wear resistance lithium based grease and other high-quality goods.

The key to antioxidants are as follows. Diphenylamine is one of them, which is also a common antioxidant additive of lithium based grease. The pure product is pure white monoclinic needle crystal, and industrial products are yellow to brown crystal. The melting point is 52.9℃ and 302℃, respectively. Insoluble in water but soluble in alcohol, ether, benzene and other solvents. Industrial supplies can be made with alcohol, see light slowly fade, storage should pay attention to shading and sealing. The experimental results show that the actual antioxidant effect of diphenylamine in lithium based grease of mineral oil is better than that of phenyl-α-naphthylamine. The best usage is 0.1%~1.0%. Benzene-α-naphthylamine is also an excellent antioxidant alias antioxidant A, petroleum additives uniform number T531. Colorless lumpy crystals that slowly turn yellowish or bluish-purple when exposed to sunlight or air. Harmful! Density 1.16~1.17, solubilization point 62℃. Insoluble in water, soluble in alcohol, medical ether, benzene and other solvents. The key to rubber and plastic products as an anti-aging agent, but also one of the efficient oxides of grease. It is common in the formation of lithium based grease such as ester oil, and the application environment temperature can reach 150℃. The dosage is generally 0.1%~1.0%. Phenyl-β-naphthylamine is one of the most excellent antioxidants. Pure products are light gray needle-like crystals that slowly turn grayish-red when exposed to air or sunlight. The density is 1.18~1.19, and the melting point is 106~108℃. Insoluble in water, soluble in alcohol, carbon tetrachloride, easily soluble in toluene, ethyl acetate, methylene chloride, benzene and carbon disulfide and other organic solutions. The property base is the same as phenyl-α-naphthylamine, which is an indispensable universal anti-aging agent. There are also di-tert-butyl p-formate petroleum additives uniform number T501. Pure white crystal, when exposed to light color yellow and gradually darkening. The density is 1.048, the melting point is 70℃, and the melting point is 257~265℃. Insoluble in water and dilute alkali solutions, soluble in benzene, xylene, alcohol, ketone, carbon tetrachloride, butyl acetate and automotive gasoline. The ultra-low temperature antioxidant effect of this kind of antioxidant is relatively good, if this kind of antioxidant and other types of antioxidant compound application, such as diisoctyl dianiline, its actual antioxidant effect is several times increased.

The antioxidant effect of antioxidants in 12-methyl polyether lithium grease is also very obvious, so different kinds of antioxidants can be added according to their own needs to improve the quality of grease.


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