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Water-resistant extreme pressure lithium lubricating grease and preparation method thereof

A lithium-based grease, water-resistant technology, used in lubricating compositions, petroleum industry, etc., can solve the problems of low drop point of water-resistant grease, poor water-scouring resistance, poor mechanical stability, etc., and shorten the saponification. Dehydration time, not easy to soften and lose, good mechanical stability

Active Publication Date: 2013-12-25
JIANGSU LOPALTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GB1376835 proposes a preparation method of water-resistant grease. Two schemes are proposed in this patent: one is to add additives to improve the water resistance of grease. It will fail and the service life is short; another solution is to prepare a lithium-based and calcium-based mixed grease to make it have excellent water resistance, but the water-resistant grease prepared by this process has a low dropping point and poor high temperature resistance
The lithium-calcium-based grease prepared by the one-step saponification method introduced in US3891564 is not only low in dropping point, but also high in soap content and poor in water erosion resistance due to the low refining temperature.
The domestic patent CN86103103 also proposes a one-step process for preparing lithium-calcium-based grease, but the dropping point of the prepared product is only about 190°C, and the mechanical stability is poor

Method used

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  • Water-resistant extreme pressure lithium lubricating grease and preparation method thereof
  • Water-resistant extreme pressure lithium lubricating grease and preparation method thereof
  • Water-resistant extreme pressure lithium lubricating grease and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] In this embodiment, the raw materials are prepared according to the following method for water-resistant extreme pressure lithium-based grease:

[0026] Step 1: Add 1500kg of base oil 500SN (kinematic viscosity at 40°C to 92mm 2 / s), 375kg of 12-hydroxystearic acid and 93kg of stearic acid were put into the saponification tank in sequence, and the stirring was started and the temperature was raised to 80°C to dissolve all the fatty acids;

[0027] Step 2: add a solution of 54kg lithium hydroxide dissolved in 250kg water, and heat up to 105°C, and saponify for 60min;

[0028] Step 3: Continue to raise the temperature to 165°C, add 11.2kg of calcium hydroxide powder, and stir for 35 minutes to react, then raise the temperature to 210°C for high-temperature refining, and keep warm for 3 minutes;

[0029] Step 4: Add 1200kg of base oil 500SN to the saponification kettle, quench the material to 170°C, then transfer to the blending kettle, circulate and filter, add the remai...

Embodiment 2

[0032] In this embodiment, the raw materials are prepared according to the following method for water-resistant extreme pressure lithium-based grease (the base oil used in this embodiment is 500SN and L-AN100, and the kinematic viscosity at 40°C after mixing is 110mm 2 / s):

[0033] Step 1: Put 1600kg of the above-mentioned mixed base oil and 450kg of 12-hydroxystearic acid into the saponification tank in sequence, start stirring and heat up to 85°C to dissolve all the fatty acids;

[0034] Step 2: Add a solution of 53kg lithium hydroxide dissolved in 300kg water, and heat up to 110°C, saponification reaction for 45min;

[0035] Step 3: Continue to heat up to 170°C, add 14kg of calcium hydroxide powder, and stir for 45 minutes to react, then heat up to 215°C for high-temperature refining, and keep warm for 5 minutes;

[0036] Step 4: Add 1200kg of the above-mentioned mixed base oil into the saponification kettle, quench the material to 175°C, then transfer it to the blending ...

Embodiment 3

[0039] In this embodiment, the raw materials are prepared according to the following method to prepare water-resistant extreme pressure lithium-based grease (the base oils selected in this embodiment are 400SN and 150BS, and the kinematic viscosity at 40°C after mixing is 160mm 2 / s):

[0040] Step 1: put 1500kg of the above-mentioned mixed base oil and 445kg of 12-hydroxystearic acid into the saponification tank in turn, start stirring and raise the temperature to 82°C to dissolve all the fatty acids;

[0041] Step 2: add a solution of 55kg lithium hydroxide dissolved in 300kg water, and heat up to 105°C, saponification reaction for 60min;

[0042] Step 3: Continue to heat up to 165°C, add 12.4kg of calcium hydroxide powder, and stir for 30 minutes to react, then heat up to 210°C for high-temperature refining, and keep warm for 3 minutes;

[0043] Step 4: Add 1200kg of the above-mentioned mixed base oil into the saponification kettle, quench the material to 175°C, then trans...

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Abstract

The invention relates to lubricating grease and a preparation method thereof, particularly relates to water-resistant extreme pressure lithium lubricating grease and a preparation method thereof, and belongs to the technical field of chemical engineering. The water-resistant extreme pressure lithium lubricating grease comprises the following components by weight percent: 70-90% of base oil, 9-15% of fatty acid, 1-2% of lithium hydrate, 0.3-0.7% of calcium hydroxide powder, 0.1-0.5% of antioxidant, 0.3-1.5% of antirust agent, 2-5% of extreme pressure agent and 2-5% of tackifier. The water-resistant extreme pressure lithium lubricating grease has the beneficial effects that the condition that the water-resistant extreme pressure lithium lubricating grease product has a high dropping point and good shear stability under a general condition is ensured; the product has excellent water-resistance, so that less loss in washing of a lot of water is ensured; the water-resistant extreme pressure lithium lubricating grease can work in the presence of water, is not easily softened to run off, and is good in mechanical stability; the product has excellent anti-rust property and extreme pressure anti-wear property; excellent lubrication of heavy duty equipment under a humid condition can be improved; the lubricating surface is prevented from being rusted.

Description

technical field [0001] The invention relates to a lubricating grease and a preparation method thereof, in particular to a water-resistant extreme pressure lithium-based lubricating grease and a preparation method thereof, belonging to the technical field of chemical industry. Background technique [0002] With the rapid development of my country's economy, the requirements for the performance of lubricating grease are becoming increasingly strict, and the division of labor is becoming more and more refined. For example, most of the equipment bearings in rolling mills operate in high temperature, heavy load, watery, and dusty environments. Common extreme pressure lithium-based greases are limited by soap structure and additives, and are easily washed away by water or become thinner during use. The phenomenon of loss, and the extreme pressure performance of the grease is also greatly reduced under the condition of water, which cannot meet the lubrication requirements. Some co...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10N30/12C10N30/06
Inventor 石俊峰杨操严军表
Owner JIANGSU LOPALTECH
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