Preparation method of ester oil lithium grease

Abstract

The invention discloses a preparation method of ester oil lithium grease, and the method comprises the following steps: adding 30-60% of ester oil and 6-15% of 12-hydroxystearic acid into a reaction kettle, heating for rasing the temperature, and stirring until the 12-hydroxystearic acid is completely dissolved; adding oil-based anhydrous LiOH (22.0-23.1% by weight of the 12-hydroxystearic acid) at 85-100 DEG C; heating to 170-180 DEG C, slowly adding 10-30% of the ester oil while stirring; heating to 200-210 DEG C, slowly adding 10-30% of the ester oil as quenching oil while stirring; cooling to below 120 DEG C, adding additives such as an antioxidant, an extreme pressure antiwear agent, an anti-rust agent and the like, and grinding for three times to obtain a grease finished product. The ester oil lithium grease prepared by direct acid-base saponification reaction of the oil-based anhydrous LiOH suspension has the same performance as the ester oil lithium grease prepared by prefabricating fatty acid lithium soap.

Description

technical field [0001] The invention relates to the technical field of lubricating grease, in particular to a preparation method of ester oil lithium-based lubricating grease. Background technique [0002] Ester oil has good thermo-oxidative stability, low temperature fluidity, excellent lubricity, low volatility and biodegradability, and is used as the base oil of grease. All well-known grease companies in the world have ester oil lithium-based grease products. However, due to the poor hydrolysis stability of ester oils, hydrolysis reactions can occur under the action of acids, alkalis, water, enzymes, etc., so it is not suitable to use LiOH.H 2 O aqueous solution directly reacts with fatty acid saponification to produce ester oil lithium-based grease. At home and abroad, the process of preparing ester oil lithium-based grease mostly adopts prefabricated fatty acid soap or first uses fatty acid and LiOH.H 2 O aqueous solution completes the saponification reaction in the ...

AI Technical Summary

Problems solved by technology

However, due to the poor hydrolysis stability of ester oils, hydrolysis reactions can occur under the action of acids, alkalis, water, enzymes, etc., so it is not suitable to use LiOH.H 2 O aqueous solution directly reacts with fatty acid saponification to produce ester oil lithium-based grease

At home and abroad, the process of preparing ester oil lithium-based grease mostly adopts prefabricated fatty acid soap or first uses fatty acid and LiOH.H 2 O aqueous solution completes the saponification reaction in the non-hydrolyzed lubricating oil, then heats up and dehydrates, and then adds ester oil, but the grease base oil made by the latter cannot completely contain ester oil

In the 1970s, Zhong Taigang and others successfully explored and researched a set of process equipment for preparing fatty acid lithium soap powder by pipeline reaction and non-heated air spray drying. It only takes 5 minutes from feeding to discharging, and finally obtains a very fine powdery dry product. Solved the following problems of prefabricated fatty acid lithium soap in the past, such as many processes, high energy consumption, long cycle, heavy labor, and large loss of raw materials.

However, due to the complexity of the device, it has not been widely used

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