Chelated lithium molybdate lubricant additive, preparation method and application thereof

A preparation method of a chelated lithium molybdate lubricant additive, comprising the following steps:

• step 1, adding kaolin and hexadecyltrimethoxysilane into deionized water, performing magnetic stirring and ultrasonic treatment on the deionized water added with the kaolin and the hexadecyltrimethoxysilane to obtain a first mixture, stirring the first mixture to perform a first reaction, and after the first reaction is finished, obtaining a first reacted mixture, filtering the first reacted mixture to obtain a first reaction product, washing and drying the first reaction product to obtain alkylated kaolin;
• wherein a mass-to-volume ratio of the kaolin:the hexadecyltrimethoxysilane:the deionized water is 1 g:0.05-0.5 g:100 mL;
• step 2, adding the alkylated kaolin obtained in the step 1 and (3-aminopropyl)trimethoxysilane into deionized water, performing magnetic stirring and ultrasonic treatment on the deionized water added with the alkylated kaolin and the (3-aminopropyl)trimethoxysilane to obtain a second mixture, stirring the second mixture to perform a second reaction, and after the second reaction is finished, obtaining a second reacted mixture, centrifuging the second reacted mixture to obtain a second reaction product, washing and drying the second reaction product to obtain amino/alkylated kaolin;
• wherein a mass-to-volume ratio of the alkylated kaolin:the (3-aminopropyl)trimethoxysilane:the deionized water is 1 g:0.05-0.2 g:100 mL;
• and
• step 3, adding the amino/alkylated kaolin obtained in the step 2 into a chelated lithium molybdate ionic liquid to obtain a third mixture, stirring the third mixture to perform a third reaction, and after the third reaction is finished, obtaining a third reacted mixture, filtering the third reacted mixture to obtain a third reaction product, washing and drying the third reaction product to obtain the chelated lithium molybdate lubricant additive;
• wherein a concentration of the chelated lithium molybdate ionic liquid is in a range of 0.1 wt % to 1 wt %, and a mass-to-volume ratio of the amino/alkylated kaolin to the chelated lithium molybdate ionic liquid is 1 g:30-50 mL.