Process for preparing transparent polyurea lubricant grease

A polyurea grease, transparent technology, applied in the direction of lubricating composition, petroleum industry, additives, etc., can solve the problem of opaque appearance and achieve the effect of transparent appearance

Inactive Publication Date: 2003-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can increase the dropping point of g

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 270g of paraffin-based lubricating oil with a viscosity of 20cSt at 100°C and put it into the fat-making kettle, and add 68g of octadecylamine (product of Shandong China Resources Co., Ltd., industrial grade), stir and heat, when the temperature rises to 80°C, speed up the stirring, and add 140g of base oil and 22g of toluene diisocyanate (TDI-2, 4, product of Shanghai Reagent No. 1 Factory, chemically pure), when octadecylamine and TDI have completely reacted, the temperature rises to 100°C, add 2ml of water, and wait until the water and TDI are completely reacted. After reacting and evaporating, continue heating to 180°C and keep the temperature constant for 2 hours, then heat until melting, add 100g remaining quenching oil, when the temperature drops below 70°C, leave the kettle. Grind twice with a three-wheel mill. The appearance of the product is transparent, and its properties are shown in Table 1.

Embodiment 2

[0015] Take 270g of paraffin-based lubricating oil with a viscosity of 20cSt at 100°C and add it to the fat-making kettle, and add 61g of octadecylamine (product of Shandong China Resources Co., Ltd., industrial grade), stir and heat, when the temperature rises to 80°C, simultaneously put Add 29g of 4,4'-diisocyanate diphenylmethane (MDI, Yantai Synthetic Leather Factory, brand MT-A, industrial grade) to 140g of base oil, melt it and add it to the fat making kettle. When the temperature rises to 100°C , add 2ml of water, after the water and MDI completely react and evaporate, continue to heat to 160°C, keep the temperature for 30 minutes, then heat to a molten state, add 100g of the remaining quenching oil, when the temperature drops below 70°C, take out the kettle. Grind twice with a three-wheel mill. The appearance of the product is transparent, and its properties are shown in Table 1.

Embodiment 3

[0017] Take 170g of paraffin-based lubricating oil with a viscosity of 20cSt at 100°C and put it into a fat-making kettle, add 43g of dodecylamine, stir and heat, when the temperature rises to 60°C, speed up the stirring, and add 30g of MDI and 140g of base oil at the same time. After the diamine and MDI have completely reacted, heat up to 100°C, add 2ml of water, and after the water has completely reacted and evaporated, continue heating to 180°C, keep the temperature constant for 1 hour, and then heat to a molten state, add 170g of the remaining quenching oil, when The temperature dropped below 70°C, and the kettle was taken out. Grind twice with a three-wheel mill. The appearance of the product is transparent, and its properties are shown in Table 1.

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Abstract

The preparation process of transparent polyurea lubricant grease includes: mixing and reacting base oil, alkyl amine and excessive diisocyanate at 50-120 deg.c; adding excessive water to neutralize unreacted diisocyanate, heating to melt, adding quenching oil and cooling. The lubricant grease product of the present invention is transparent and has high dropping point and low noise. It may be used in high motor bearings, continuous casting machine bearing, automobile hub bearing and constant rate gimbal joint and for the lubrication of precise instruments and meters.

Description

technical field [0001] The invention belongs to a preparation method of lubricating grease. Background technique [0002] In 1954, when Swaken et al. investigated the thermal stability and oxidation stability of silicone oil, they first discovered that polyurea thickener had excellent performance. Since then, research reports on polyurea grease have emerged in an endless stream. Since it is difficult to make grease with a high dropping point from a symmetrical diurea, an asymmetric structure is generally used. JP 1139696 (Ping 1-139696) prepares diurea grease with high dropping point by changing the structure of diisocyanate, EP 0274756 uses primary amine and primary alcohol to react with diisocyanate to prepare urea-urethane as thickener High dropping point grease, US 5158694 makes polyurea grease with diisocyanate, water and amine. The dropping point of the lubricating grease prepared according to the above-mentioned patent method is generally at 230-260°C. [0003] CN...

Claims

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Application Information

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IPC IPC(8): C10M149/20
Inventor 孙洪伟杨海宁姚立丹杨玮
Owner CHINA PETROLEUM & CHEM CORP
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