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

Active Publication Date: 2017-11-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN85108442A has reported " binary metal soap lubricating grease composition and preparation method thereof ", adopts two-step method to prepare complex lithium calcium base lubricating grease, and this composition has good high temperature resistance, extreme pressure and corrosion resistance, but this The preparation method is complex and difficult to control, and the product’s anti-water shear stability and low-temperature performance have not been introduced; CN86103103A discloses a one-step preparation process for lithium-calcium-based lubricating grease, and the obtained product has excellent shear stability And good water resistance and excellent colloidal stability, but the dropping point is relatively low (180 ° C); US5350531 reported a preparation method of lithium-calcium complex grease, the grease prepared by this method has good mechanical stability , 100,000 times of shear difference is 25, but its dropping point is less than 200 ° C; CN1252434A reported a lithium-calcium-based composition and its preparation process, the product has good water resistance shear stability, mechanical stability, high resistance Low temperature performance, extreme pressure wear resistance and protection; CN101921649A prepared a high dropping point lithium-calcium complex grease by adding surfactant to the system; CN101792689A replaced lithium hydroxide monohydrate with lithium hydroxide suspension, Provides a simple preparation method for high-performance lithium-calcium complex grease
Nanomaterials are also gradually used in the application of grease, such as nano-silica, nano-diamond, nano-titanium dioxide, nano-zinc oxide, etc., but there is still no research on the application of graphene in grease

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  • A kind of complex lithium calcium base grease and preparation method thereof
  • A kind of complex lithium calcium base grease and preparation method thereof

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preparation example Construction

[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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Abstract

The invention discloses a composite lithium calcium base lubricating grease and a preparation method thereof. Based on the grease weight, the lithium-calcium complex grease includes the following components: 65-95% lubricating base oil, 5-30% lithium-calcium complex thickener, and 0.2-15% graphene. The complex lithium-calcium-based lubricating grease of the invention has excellent performances such as high temperature resistance, water resistance, adhesion, colloid stability, extreme pressure and wear resistance, lubrication life, corrosion resistance and salt spray resistance.

Description

Technical field [0001] The invention relates to a lubricant material, to be precise, a composite lithium calcium base grease and a preparation method thereof. Background technique [0002] Different metals give different properties to grease. In recent years, with the development of modern industry, bearing, automobile, printing and dyeing, mining, metallurgy, aerospace and other industrial sectors have proposed the oxidation resistance, high and low temperature resistance, extreme pressure and wear resistance, water resistance, and mechanical stability of grease. In response to more and more demanding requirements, complex thickener greases have been greatly developed. Therefore, there are a lot of literatures on the performance of complex lithium calcium grease. [0003] CN85108442A reports "Binary metal soap grease composition and its preparation method". A two-step method is used to prepare complex lithium calcium-based grease. The composition has good high temperature resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M169/06C10M123/02C10M177/00
Inventor 么佳耀郑会孙洪伟何懿峰段庆华张建荣陈政刘中其姜靓
Owner CHINA PETROLEUM & CHEM CORP
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