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Lubricating grease containing modified silica component and preparation method of lubricating grease

A technology of lubricating grease and lithium-based grease, applied in lubricating composition, dyeing organosilicon compound treatment, petroleum industry, etc. Inconvenience, reducing the service life of grease, etc., to achieve good colloidal stability, small water loss, and small quality loss

Active Publication Date: 2014-01-01
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

while SiO 2 Particles have a large surface area and surface free energy, directly added to the grease, SiO 2 Particles are easy to agglomerate, resulting in SiO 2 The particles are unevenly dispersed in the grease, which affects the anti-wear and anti-friction, service life and stability of the grease
[0004] At present, the common domestic SiO 2 The silicone grease is SiO 2 Grease prepared directly with base oil, this type of silicone grease plays an irreplaceable role in some parts, but this type of silicone grease has great defects in storage stability and shear stability, that is, storage becomes hard and shear softening, causing inconvenience during the production and use of the grease, and this defect also reduces the service life of the grease
At the same time, these defects limit the application fields and regions, so most of the silicone grease is still used in damping and sealing parts

Method used

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  • Lubricating grease containing modified silica component and preparation method of lubricating grease
  • Lubricating grease containing modified silica component and preparation method of lubricating grease
  • Lubricating grease containing modified silica component and preparation method of lubricating grease

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Experimental program
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preparation example Construction

[0047] SiO 2 Surface modification and its containing modified SiO 2 The preparation method of lubricating grease, its preparation method step is as follows:

[0048] 1), SiO2 2 When treating the particle surface with a silane modifier, the SiO 2 Uniformly dispersed in synthetic oil PAO, temperature controlled at 130°C to 160°C, silane modifier and SiO 2 The weight ratio of the particles is 1:20-1:10 (in Example 5, in order to verify the effect of the silane modifier, a blank comparison test was specially done); add the hydrolyzed silane modifier, and react 5-8 Hour.

[0049] 2) SiO 2 After the particles are surface treated, the temperature drops below 100°C, add 12-hydroxystearic acid, stearic acid and base oil to dissolve the 12-hydroxystearic acid, stearic acid, and keep the temperature at 85°C-95°C, Add lithium hydroxide solution to start saponification, and the saponification time is controlled at 2-4 hours.

[0050] 3) After the saponification is completed, stir an...

Embodiment 1

[0053] 11.4g of SiO 2 Evenly dispersed in 300g of synthetic oil PAO, the temperature was controlled at 135°C, 0.6g of hydrolyzed silane modifier was added, and reacted for 5 hours. Lower the temperature to 90°C, add 108g of 12-hydroxystearic acid, 120g of stearic acid, and 846g of mineral oil to fully dissolve the 12-hydroxystearic acid and stearic acid, keep the temperature at 85°C, and add lithium hydroxide containing 36g of aqueous solution begins to saponify, and the saponification time is controlled within 3 hours. After the saponification is completed, stir and heat to 190°C, add 574g of synthetic oil for rapid cooling, continue stirring, and add additives such as 13.2g of sulfurized isobutylene, 26.4g of diphenylamine, dinonyl 0.4 g of barium naphthalene sulfonate, after being evenly stirred, after being homogenized three times by a three-roll machine, the finished product is filled.

[0054] Contains modified SiO 2 The weight percent of each component of the lubricat...

Embodiment 2

[0063] 27g of SiO 2 Disperse in 400g of synthetic oil PAO, control the temperature at 160°C, add 3g of hydrolyzed silane modifier, react for 8 hours and lower the temperature to 90°C, add 135g of 12-hydroxystearic acid, 135g of stearic acid , mineral oil 660g, fully dissolve 12-hydroxystearic acid and stearic acid, keep the temperature at 95°C, add an aqueous solution containing 42g of lithium hydroxide to start saponification, saponification time is controlled at 4 hours, after saponification is completed, stir and heat to 210°C, add 347g synthetic oil and 253g mineral oil for rapid cooling, keep stirring, add additives below 90°C 20g sulfurized olefin, 13.2g tricresyl phosphate, 4g diphenylamine, 2.4g 2-naphthol, 0.4 benzotriazole g. After stirring evenly, after three times of homogenization treatment by a three-roller machine, the finished product is filled.

[0064] Contains modified SiO 2 The weight percent of each component of the lubricating grease of component is:

...

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Abstract

The invention relates to lubricating grease containing a modified silica component and a preparation method of the lubricating grease. The excellent properties of silicone grease and lithium lubricating grease are well combined through modified SiO2. With total weight of a composition as benchmark, the lubricating grease provided by the invention comprises the following components: a thickening agent accounting for 10-25% of the total weight and including 12-hydroxystearic acid, stearic acid and the modified SiO2; base oil accounting for 73-88% of the total weight and consisting of synthetic oil and mineral oil; and additives mainly including the following three types: (a) 0.6-1.8% of anti-wear reagent at extreme pressure, (b) 0.32-1.32% of antioxidant, and (c) 0.02-0.04% of antirust preservative. The novel lubricating grease containing modified SiO2 has excellent shear stability and storage stability and is a kind of SiO2-containing lithium lubricating grease in which high and low temperature, colloid stability and water resistance are greatly improved. The lubricating grease is especially suitable for application under harsh environmental conditions of high temperature and heavy load.

Description

technical field [0001] The invention belongs to the technical field of lubricating grease, and relates to a novel high-performance grease containing modified silicon dioxide (SiO2) 2 ) components of lubricating grease and its preparation method. This kind contains modified SiO 2 The new type of lubricating grease with components has excellent shear stability and storage stability. 2 of grease. It is especially suitable for use under severe environmental conditions of high temperature and heavy load. Background technique [0002] Grease belongs to the category of lubricants. Usual lithium-based, calcium-based, lithium complex and polyurea-based greases are thick semi-solid, mainly composed of base oil, thickener and a small amount of additives, used for contact between metals such as bearings and hubs It can be used to lubricate and seal the contact parts between non-metals and metals, and some are also used on metal surfaces to fill gaps and prevent rust. However, most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/00C10M177/00C09C1/28C09C3/12C10N30/10C10N30/08C10N30/06
Inventor 李栋郭振俊吴宝杰高艳青冯强李倬张晓凯
Owner CHINA PETROLEUM & CHEM CORP
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