| abstract |
Lubricating-grease consists of a hydrocarbon, a lime soap, and an amorphous hydrocarbon wax such as petrolatum or ceresin emulsified with a small amount of water. The addition of 15 per cent or more by weight of the wax prevents the separation of oil from the composition. A crude oil or distillate such as cylinder oil is heated with a lime soap of tallow or other animal, vegetable or fish oil and petrolatum is then added and the resulting solution cooled slightly. A further quantity of oil containing an oil-soluble emulsifying agent and a small amount of water is added and the mixture agitated and allowed to cool. Suitable emulsifying agents are the alkaline earth or alkali-metal salts of alkyl or aryl sulphonates such as mahogany or other petroleum sulphonates, naphthenic acid sulphonates, or sulphonated alcohols. Other additions specified are, glycerin, ethyl oleate, graphite, chalk, or talc. |