A kind of complex lithium calcium base grease and preparation method thereof
A lithium-calcium composite and lubricating grease technology, which is applied in the direction of lubricating compositions, petroleum industry, thickeners, etc., can solve the problems of no related research on graphene application, low-temperature performance without introduction, and difficult control, etc., to achieve excellent Effects of thermal stability, shortening saponification time, and enhancing ability
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[0028] According to the second aspect of the present invention, the present invention provides a method for preparing a complex lithium-calcium-based grease. The method includes: mixing graphene, a complex lithium-calcium-based thickener, and part of the base oil uniformly, at a temperature of 190-240 Refining at a constant temperature of ℃, cooling, adding the remaining base oil, adding necessary additives to obtain the finished product.
[0029] Among them, the amount of graphene, complex lithium calcium base thickener and base oil is such that the obtained complex lithium calcium base grease, based on the weight of the grease, includes the following components: 65-95% of lubricating base oil, 5-30 % Complex lithium-calcium thickener, 0.2-15% graphene.
[0030] Preferably, the amount of graphene, complex lithium calcium thickener and base oil is such that the obtained complex lithium calcium grease, based on the weight of the grease, includes the following components: 70-90% lubr...
Embodiment 1
[0049] Preparation of graphene oxide:
[0050] Mix 1g graphite flakes, 0.5g sodium nitrate and 23ml concentrated sulfuric acid in an ice bath, slowly add 3g potassium permanganate under stirring, keep the temperature below 10℃, stir for 1h, then stir the mixture at 35℃ for 0.5h, then add Dilute with 50ml of deionized water and release a lot of heat during the process. Keep the temperature below 100°C in an ice bath. After adding 50ml of water, the mixture is stirred for 0.5h, and then 200ml of deionized water is added for further dilution. Then, 10 ml of a 30% by weight aqueous hydrogen peroxide solution was added to reduce potassium permanganate. Finally, the mixture was washed and filtered with 5% hydrochloric acid (400ml) to remove metal ions. Then 0.5L of deionized water was used to remove the acid, and dried at 60°C for 24 hours to obtain graphene oxide.
[0051] Preparation of graphene:
[0052] Add 0.1g of the graphene oxide prepared above into 100ml of water for ultrasonic...
Embodiment 2
[0058] The preparation of graphene oxide is the same as in Example 1.
[0059] Preparation of graphene:
[0060] The graphene oxide produced by 0.1g was added to 100ml of water for ultrasonic dispersion (ultrasonic frequency is 35kHz) for 30min, then 5ml of hydrazine hydrate (mass concentration is 85%) was added, and the reaction was carried out at 100℃ for 24h in an oil bath. The black flocculent precipitate was finally obtained. The powder obtained after water washing, suction filtration, and drying is graphene. The properties of graphene are shown in Table 2 below.
[0061] Preparation of complex lithium-calcium grease:
[0062] Raw material components: 25.8g graphene; 150BS base oil: 420g (100°C viscosity is 30mm 2 / s); Lithium hydroxide monohydrate 33.63g; calcium hydroxide 3.12g; 12-hydroxystearic acid 98.35g; azelaic acid 46.21g; 4.2g diisooctyl diphenylamine;
[0063] First add 25.8 grams of graphene, 315 grams of base oil and 98.35 grams of 12-hydroxystearic acid to the fat ma...
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