A kind of lithium composite grease and preparation method thereof

A technology of complex lithium-based and base grease, applied in lubricating compositions, petroleum industry, thickeners, etc., can solve problems such as related research without graphene application, shorten the saponification time, improve the grease forming speed, and improve the The effect of colloidal stability

Active Publication Date: 2017-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanomaterials are also gradually used in the application of lithium-based grease, such as nano-silicon dioxide, nano-diamond, nano-titanium dioxide, nano-zinc oxide, etc., but there is still no research on the application of graphene in grease

Method used

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  • A kind of lithium composite grease and preparation method thereof
  • A kind of lithium composite 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 preparation method of lithium complex grease, the method comprising: uniformly mixing graphene, lithium complex thickener and part of the base oil, at a constant temperature of 180-230 ℃ Refining, cooling, adding the remaining base oil and adding necessary additives to get the finished product.

[0029] Wherein, the amount of graphene, lithium complex thickener and base oil is based on the weight of the obtained lubricating grease, including the following components: 65-95% lubricating base oil, 6-20% lithium complex thickener agent, 0.5-15% graphene. The preferred amount of graphene, lithium complex thickener and base oil is such that based on the weight of the lubricating grease obtained, the following components are included: 75-88% lubricating base oil, 8-18% lithium complex thickener , 1-12% graphene.

[0030] According to the present invention, said part of base oil: remaini...

Embodiment 1

[0047] Preparation of graphene oxide:

[0048] Mix 1g of graphite flakes, 0.5g of sodium nitrate and 23ml of concentrated sulfuric acid in an ice bath, slowly add 3g of potassium permanganate while stirring, keep the temperature below 10°C and stir for 1h, then stir the mixture at 35°C for 0.5h, then add Dilute with 50ml of deionized water, a lot of heat is released during the process, keep the temperature below 100°C in an ice bath, after adding 50ml of water, stir the mixture for 0.5h, then add 200ml of deionized water for further dilution. Potassium permanganate was then reduced by adding 10 ml of a 30% by weight aqueous hydrogen peroxide solution. Finally, the mixture was washed and filtered with 5% hydrochloric acid (400ml) to remove metal ions. Then, the acid was removed with 0.5 L of deionized water, and dried at 60 °C for 24 h to obtain graphene oxide.

[0049] Preparation of graphene:

[0050] Add 0.1g of the graphene oxide prepared above to 100ml of water for ultr...

Embodiment 2

[0056] The preparation of graphene oxide is the same as in Example 1.

[0057] Preparation of graphene:

[0058] Add 0.1 g of the prepared graphene oxide into 100 ml of water for ultrasonic dispersion (ultrasonic frequency 35 kHz) for 30 min, then add 5 ml of hydrazine hydrate (mass concentration: 85%), and react in an oil bath at 100 ° C for 24 h. The powder obtained after water washing, suction filtration and drying is graphene, and the properties of graphene are shown in Table 2 below.

[0059] Preparation of lithium complex grease:

[0060] Raw material components: graphene 72kg; 150BS base oil 450kg (viscosity of 30mm at 100°C 2 / s); lithium hydroxide monohydrate 14.26kg; stearic acid 66.99kg; terephthalic acid 7.82kg; 1.2kg diisooctyl diphenylamine;

[0061] First add 300kg of base oil, 72kg of graphene, 66.99kg of stearic acid and 7.82kg of terephthalic acid into the fat-making kettle, heat and stir, raise the temperature to 80°C and add lithium hydroxide aqueous sol...

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Abstract

The invention discloses a composite lithium base grease and a preparation method thereof. Based on the weight of the grease, the lithium complex grease includes the following components: 65-95% lubricating base oil, 6-20% lithium complex thickener, and 0.5-15% graphene. The complex lithium-based grease of the present invention has excellent high temperature resistance, water resistance and adhesion, colloidal stability, extreme pressure and wear resistance, lubricating life, corrosion resistance and salt spray resistance.

Description

technical field [0001] The invention relates to a lubricant material, in particular to a lithium composite grease and a preparation method thereof. Background technique [0002] Composite lithium-based grease is a high-temperature multi-effect grease developed in the 1960s. It has a higher dropping point than lithium-based grease and is more suitable for use at high temperatures. It has good multi-effect performance, such as good colloidal stability , shear stability, water resistance and long life, and has a strong thickening ability for various types of mineral oils and synthetic oils. However, with the development of modern industry, industrial departments such as bearings, automobiles, printing and dyeing, mining, metallurgy, and aerospace have put forward requirements on the oxidation resistance, high and low temperature resistance, extreme pressure and wear resistance, water resistance, and mechanical stability of lubricating greases. increasingly stringent requiremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M113/02C10M123/02
Inventor 郑会孙洪伟么佳耀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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