Preparation method of polyurea-composite calcium lubricating grease

A technology of lubricating grease and polyurea, which is applied in the field of lubricating grease preparation, can solve the problems of volatilization of low-molecular acid, rising to 70-80°C, swelling of the pot, etc., achieving excellent high-temperature performance, easy operation, and avoiding volatilization

Inactive Publication Date: 2004-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing polyurea-composite calcium-based grease according to the previous order, there is also a problem, that is, after the polyurea grease is prepared, the temperature in the kettle has generally risen to 70-80°C, and adding an organic acid at this time will cause Severe low molecular acid volatilization occurs
[0003] As can be seen from the above introduction, when preparing polyurea-composite calcium-based grease, the prior art does not advocate the method of preparing composite calcium-based grease first, and then preparing polyurea grease, which may be due to There will be a phenomenon of pot swelling, that is, a large amount of foam will quickly fill up the pot. Once this phenomenon occurs, the defoamer must be added immediately, otherwise it will cause serious consequences
And those skilled in the art generally think that it is difficult to prepare polyurea grease in the same kettle after the pot phenomenon occurs

Method used

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  • Preparation method of polyurea-composite calcium lubricating grease

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 800g of 500SN oil (40°C viscosity, 100°C viscosity 11mm 2 / s) 94.5g of calcium hydroxide and 450g of water were added to the normal pressure grease kettle, stirred evenly, and 117.9g of glacial acetic acid was added at room temperature, stirred evenly, and reacted for about 10 minutes, 28.3g of n-octanoic acid was added, stirred evenly, and ten Dihydroxystearic acid 117.8g, heating up to about 70 ℃. At the same time, add 80.7g of 4,4'-diphenylmethane diisocyanate (MDI) and 350g of 500SN oil into container A, and heat until the MDI is completely dissolved. Pour the MDI oil solution in container A into the fat-making kettle, and heat up to about 80°C. Then add 119.4g of dodecylamine, after 2 hours of saponification of drained water, continue to heat up to 220°C, add 200g of quenching oil, stir to lower the temperature, and grind at room temperature to obtain polyurea-composite calcium-based grease. The properties are shown in Table 1.

Embodiment 2

[0016] 350g hydrogenated α-olefin oil (viscosity 12mm at 100°C 2 / s) and 42g of calcium hydroxide and 200g of water were added to an ordinary pressure grease kettle, stirred evenly, added 49g of glacial acetic acid at room temperature, stirred evenly, and reacted for about 10 minutes, added 9.8g of boric acid, stirred evenly, and added dodecyl hydroxy Stearic acid 49g, heating up to about 70 ℃. At the same time, add 28 g of 2,4-tolyl diisocyanate (TDI) and 150 g of base oil into container A, and heat until the MDI is completely dissolved. Pour the MDI oil solution in container A into the fat-making kettle, and heat up to about 80°C. Then add 59.7g of dodecylamine, after 2 hours of draining saponification, continue to heat up to 220°C, add 100g of quenching oil, stir to lower the temperature, and grind at room temperature to obtain polyurea-complex calcium base grease. The properties are shown in Table 1.

Embodiment 3

[0018] 450g pentaerythritol ester (100 ℃ viscosity 12mm 2 / s) and 42g of calcium hydroxide and 200g of water were added to the normal pressure grease kettle, stirred evenly, and 49g of glacial acetic acid was added at room temperature, stirred evenly, and reacted for about 10 minutes, added 12g of n-octanoic acid, stirred evenly, and added dodecyl hydroxy Stearic acid 49g, heating up to about 70 ℃. At the same time, add 42g of 4,4'-diphenylmethane diisocyanate (MDI) and 150g of base oil into container A, and heat until the MDI is completely dissolved. Pour the MDI oil solution in container A into the fat-making kettle, and heat up to about 80°C. After that, add 90g of octadecylamine, drain the water and saponify for 2 hours, continue to heat up to 220°C, add 70g of quenching oil, stir to cool down, and grind at room temperature to obtain polyurea-composite calcium-based grease. The properties are shown in Table 1.

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Abstract

A lubricating polyureas-composite calcium grease is prepared through proportionally mixing basic oil, calcium hydroxide (oxide), water and C1-C20 organic acid together, heating to 30-100 deg.C, adding diisocyanate and organic amine, draining water, saponifying, heating to 210-230 deg.C, cooling and homogenizing. Its advantages are high refractory performance, stability and extreme-pressure antiwear nature.

Description

technical field [0001] The invention relates to a preparation method of lubricating grease. Background technique [0002] The usual preparation method of polyurea-complex calcium mixed base grease is to prepare two kinds of base grease respectively, and then mix them in a certain proportion. Provided a kind of method for preparing polyurea-composite calcium as CN1364859A, polyurea and composite calcium are prepared separately earlier, mix by certain ratio again, procedure is complicated, because lubricating grease viscosity is very big at normal temperature, can't use mechanical pump, turn The kettle process is done manually, which is time-consuming and labor-intensive. US 5,084,193 provides a method for preparing polyurea-complex calcium grease, suggesting that polyurea grease should be prepared first and then calcium complex grease, or it can be prepared in the reverse order, but the former order is recommended. However, when preparing polyurea-composite calcium-based gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M159/12
Inventor 孙洪伟姚智勤杨玮
Owner CHINA PETROLEUM & CHEM CORP
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