Structure and properties of greases based on mixed lithium-calcium soaps
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Stable greases based on lithium and calcium stearates can be obtained if these compounds are present in molar ratios of 19 ∶ 1 to 3 ∶ 1 in the thickener.
An increase in the Ca soap concentration within these limits has little effect on the thickening capacity of the combined soaps, the structure, and rheological properties of the greases.
The critical concentration of the Ca soap in the thickener corresponds to 35–40%; above this value the structure changes markedly and the rheological properties and colloidal and mechanical stabilities of the greases deteriorate.
Addition of Ca soaps to Li greases improves the water resistance and leads to a steady fall in the dropping point of the greases.
KeywordsCalcium Lithium Structure Change Rheological Property Stearate
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