Tetra-urea lubricating grease and preparation method thereof

Abstract

The invention provides a tetra-urea lubricating grease and a preparation method thereof. The tetra-urea lubricating grease comprises lubricating oil basic oil and a tetra-urea thickening agent, and does not contain di-urea thickening agent and fatty acid metal salt. In the preparation method, the tetra-urea lubricating grease is obtained by the reaction of diisocyanate, diamine and monoamine. Compared with the di-urea lubricating grease, the tetra-urea lubricating grease has higher dropping point, better extreme pressure property, colloid stability and shearing stability.

Description

technical field

[0001] The invention relates to a tetraurea lubricating grease and a preparation method thereof Background technique

[0002] Grease is composed of grease, thickener and additives. Thickener is an indispensable component in grease, and its properties are one of the main factors that directly affect the performance of grease. Polyurea thickener and polyurea grease are developed to meet the more stringent requirements for lubricating materials due to the rapid development of modern industrial technology and equipment.

[0003] With the rapid development of modern industry, the requirements for lubricating materials are becoming more and more stringent. Mechanical equipment operating continuously under high load, high speed and high temperature, the high temperature range of lubricating grease reaches 175-235 ℃ or higher, and requires a long Long service life of lubrication to prolong grease change cycle, improve production efficiency and reduce production cost...

Examples

Embodiment 1

[0034] First, mix about 145 grams of 500SN (92-98 cSt at 40°C kinematic viscosity) base oil with 29.58 grams of MDI and heat it to 50°C, slowly add 3.56 grams of ethylenediamine, heat up to 80°C, and react for 30 minutes. About 145 grams of Mix base oil with 31.87 grams of octadecylamine, heat to 60°C, add to the above mixture, raise the temperature to 80°C, react for 30 minutes, continue to heat up to 210°C, then add about 145 grams of base oil and cool to about 100°C for grinding.

[0035] Take about 150ml of petroleum ether (fraction 90-120), put it in a 200ml beaker, then take about 10g of the product into the beaker, stir it magnetically for 2 hours, then place it in a shaker for 1-2 days, and then take it out. Use a funnel to filter, wash with petroleum ether until the sample is pure white, then take out the sample and place it in an oven at 100°C for about 1 hour, take out a solid white powdery substance, which is the thickener, and perform characterization. figure 1 , ...

Embodiment 2

[0037] First, mix about 146.67 grams of 150BS (100°C kinematic viscosity is 29cSt) base oil with 16.76 grams of TDI and heat it to 40°C, slowly add 3.93 grams of propylenediamine, heat up to 70°C, and react for 30 minutes, about 146.67 grams of base oil Mix with 39.31 grams of dodecylamine, heat to 50°C, add to the above mixture, raise the temperature to 70°C, react for 30 minutes, continue to heat up to 200°C, then add about 146.67 grams of base oil and cool to about 80°C for grinding.

Embodiment 3

[0039]First, mix about 148.33 grams of PAO10 synthetic oil (100°C kinematic viscosity is 9.8-10.2cSt) base oil and 25.04 grams of HDI and heat it to 45°C, slowly add 16.10 grams of p-phenylenediamine, raise the temperature to 75°C, and react for 30 minutes. About 148.33 grams of base oil and 13.87 grams of aniline were mixed and heated to 55°C, added to the above mixture, heated to 75°C, reacted for 30 minutes, continued to heat up to 205°C, and then added about 148.33 grams of base oil and cooled to about 90°C for grinding. Can.

technical field

[0001] The invention relates to a tetraurea lubricating grease and a preparation method thereof Background technique

[0002] Grease is composed of grease, thickener and additives. Thickener is an indispensable component in grease, and its properties are one of the main factors that directly affect the performance of grease. Polyurea thickener and polyurea grease are developed to meet the more stringent requirements for lubricating materials due to the rapid development of modern industrial technology and equipment.

[0003] With the rapid development of modern industry, the requirements for lubricating materials are becoming more and more stringent. Mechanical equipment operating continuously under high load, high speed and high temperature, the high temperature range of lubricating grease reaches 175-235 ℃ or higher, and requires a long Long service life of lubrication to prolong grease change cycle, improve production efficiency and reduce production cost...

Examples

Embodiment 1

[0034] First, mix about 145 grams of 500SN (92-98 cSt at 40°C kinematic viscosity) base oil with 29.58 grams of MDI and heat it to 50°C, slowly add 3.56 grams of ethylenediamine, heat up to 80°C, and react for 30 minutes. About 145 grams of Mix base oil with 31.87 grams of octadecylamine, heat to 60°C, add to the above mixture, raise the temperature to 80°C, react for 30 minutes, continue to heat up to 210°C, then add about 145 grams of base oil and cool to about 100°C for grinding.

[0035] Take about 150ml of petroleum ether (fraction 90-120), put it in a 200ml beaker, then take about 10g of the product into the beaker, stir it magnetically for 2 hours, then place it in a shaker for 1-2 days, and then take it out. Use a funnel to filter, wash with petroleum ether until the sample is pure white, then take out the sample and place it in an oven at 100°C for about 1 hour, take out a solid white powdery substance, which is the thickener, and perform characterization. figure 1 , ...

Embodiment 2

[0037] First, mix about 146.67 grams of 150BS (100°C kinematic viscosity is 29cSt) base oil with 16.76 grams of TDI and heat it to 40°C, slowly add 3.93 grams of propylenediamine, heat up to 70°C, and react for 30 minutes, about 146.67 grams of base oil Mix with 39.31 grams of dodecylamine, heat to 50°C, add to the above mixture, raise the temperature to 70°C, react for 30 minutes, continue to heat up to 200°C, then add about 146.67 grams of base oil and cool to about 80°C for grinding.

Embodiment 3

[0039]First, mix about 148.33 grams of PAO10 synthetic oil (100°C kinematic viscosity is 9.8-10.2cSt) base oil and 25.04 grams of HDI and heat it to 45°C, slowly add 16.10 grams of p-phenylenediamine, raise the temperature to 75°C, and react for 30 minutes. About 148.33 grams of base oil and 13.87 grams of aniline were mixed and heated to 55°C, added to the above mixture, heated to 75°C, reacted for 30 minutes, continued to heat up to 205°C, and then added about 148.33 grams of base oil and cooled to about 90°C for grinding. Can.

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