Polyurea-based lubricating grease with high mechanical stability and preparation method thereof

Abstract

The invention belongs to the field of polyurea-based lubricating grease, and in particular provides polyurea-based lubricating grease with high mechanical stability and a preparation method thereof. The polyurea-based lubricating grease consists of the following components in percentage by weight: 70 to 90 percent of base oil and 10 to 30 percent of polyurea-based lubricating grease thickening agent, wherein the polyurea-based lubricating grease thickening agent is prepared by mixing diisocyanate and organic amine and directly thickening the base oil; isocyanate ions and amine ions have the same molar content; and the organic amine consists of fatty amine, naphthene amine and aromatic amine in the molar ratio of (2-4):(1-2):5. The polyurea-based lubricating grease has high mechanical stability and long service life.

Description

technical field

[0001] The invention belongs to the field of polyurea-based lubricating grease, and specifically provides a polyurea-based lubricating grease with high mechanical stability and a preparation method thereof. Background technique

[0002] From 1954, when Swaken et al. investigated the thermal stability and oxidation stability thickener of silicone oil, they first discovered that polyurea-based grease had excellent performance. Since then, research reports on polyurea-based greases have emerged in an endless stream. Polyurea-based grease has a variety of excellent properties, which can be summarized as: (1) good thermal stability and oxidation stability; (2) good low temperature performance; (3) good corrosion resistance and water resistance; ( 4) Good compatibility: polyurea-based grease has good compatibility with rubber and plastics, and polyurea-based grease has good compatibility with other thickeners such as bentonite. Compatibility; (5) Good colloidal s...

Examples

Embodiment 1

[0029] Take 300g of mineral oil with a viscosity of 20sCt at 100°C and add it to the reaction kettle, add 13.1g of octadecylamine, 13g of oleylamine, 4.8g of cyclohexylamine, and 26.1g of p-toluidine, stir and heat, when the temperature rises to 80°C, accelerate Stir, control the frequency of the frequency converter at 20Hz, add 200g of base oil and 48.8g of diphenylmethane-4,4'-diisocyanate at the same time, control the addition time for 60min, when it is completely added, control the temperature at 90°C, and react for 30min. , stir and heat, raise the temperature to 160°C, keep the temperature constant for 1 hour, then heat to melt, add 100g of base oil to cool, when the temperature drops below 80°C, take it out of the kettle and grind it three times with a three-roller machine, the product performance indicators are shown in Table 1 shown.

Embodiment 2

[0031] Take 300g of mineral oil with a viscosity of 20sCt at 100°C and put it into the reaction kettle, add 11.9g of octadecylamine, 11.8g of oleylamine, 8.82g of cyclohexylamine, and 23.7g of p-toluidine, stir and heat, when the temperature rises to 75°C, Speed ​​up the stirring, control the frequency of the inverter at 25Hz, add 200g of base oil and 49.7g of diphenylmethane-4,4'-diisocyanate at the same time, control the addition time for 45min, when it is completely added, control the temperature at 95°C, react for 60min, and the reaction is complete Afterwards, stir and heat, raise the temperature to 160°C, and keep the temperature constant for 1 hour. After that, heat to melt, add 100g of base oil to cool, and when the temperature drops below 80°C, take out the kettle and grind it three times with a three-roller machine. The product performance indicators are shown in the table 1.

Embodiment 3

[0033] Take 300g of PAO20 synthetic oil with a viscosity of 20sCt at 100°C and add it to the reaction kettle, add 19.3g of octadecylamine, 19.2g of oleylamine, 3.5g of cyclohexylamine, and 19.2g of p-toluidine, stir and heat, when the temperature rises to 80°C , speed up the stirring, control the frequency of the inverter at 20Hz, add 200g of base oil and 44.7g of diphenylmethane-4,4'-diisocyanate at the same time, control the addition time for 60min, and control the temperature at 95°C after the addition is complete, and react for 60min. After that, stir and heat, raise the temperature to 180°C, and keep the temperature constant for 1 hour. After that, heat to melt, add 100g of base oil to cool, when the temperature drops below 80°C, take out the kettle and grind it three times with a three-roller machine. The product performance indicators are as follows: Table 1 shows.

technical field

[0001] The invention belongs to the field of polyurea-based lubricating grease, and specifically provides a polyurea-based lubricating grease with high mechanical stability and a preparation method thereof. Background technique

[0002] From 1954, when Swaken et al. investigated the thermal stability and oxidation stability thickener of silicone oil, they first discovered that polyurea-based grease had excellent performance. Since then, research reports on polyurea-based greases have emerged in an endless stream. Polyurea-based grease has a variety of excellent properties, which can be summarized as: (1) good thermal stability and oxidation stability; (2) good low temperature performance; (3) good corrosion resistance and water resistance; ( 4) Good compatibility: polyurea-based grease has good compatibility with rubber and plastics, and polyurea-based grease has good compatibility with other thickeners such as bentonite. Compatibility; (5) Good colloidal s...

Examples

Embodiment 1

[0029] Take 300g of mineral oil with a viscosity of 20sCt at 100°C and add it to the reaction kettle, add 13.1g of octadecylamine, 13g of oleylamine, 4.8g of cyclohexylamine, and 26.1g of p-toluidine, stir and heat, when the temperature rises to 80°C, accelerate Stir, control the frequency of the frequency converter at 20Hz, add 200g of base oil and 48.8g of diphenylmethane-4,4'-diisocyanate at the same time, control the addition time for 60min, when it is completely added, control the temperature at 90°C, and react for 30min. , stir and heat, raise the temperature to 160°C, keep the temperature constant for 1 hour, then heat to melt, add 100g of base oil to cool, when the temperature drops below 80°C, take it out of the kettle and grind it three times with a three-roller machine, the product performance indicators are shown in Table 1 shown.

Embodiment 2

[0031] Take 300g of mineral oil with a viscosity of 20sCt at 100°C and put it into the reaction kettle, add 11.9g of octadecylamine, 11.8g of oleylamine, 8.82g of cyclohexylamine, and 23.7g of p-toluidine, stir and heat, when the temperature rises to 75°C, Speed ​​up the stirring, control the frequency of the inverter at 25Hz, add 200g of base oil and 49.7g of diphenylmethane-4,4'-diisocyanate at the same time, control the addition time for 45min, when it is completely added, control the temperature at 95°C, react for 60min, and the reaction is complete Afterwards, stir and heat, raise the temperature to 160°C, and keep the temperature constant for 1 hour. After that, heat to melt, add 100g of base oil to cool, and when the temperature drops below 80°C, take out the kettle and grind it three times with a three-roller machine. The product performance indicators are shown in the table 1.

Embodiment 3

[0033] Take 300g of PAO20 synthetic oil with a viscosity of 20sCt at 100°C and add it to the reaction kettle, add 19.3g of octadecylamine, 19.2g of oleylamine, 3.5g of cyclohexylamine, and 19.2g of p-toluidine, stir and heat, when the temperature rises to 80°C , speed up the stirring, control the frequency of the inverter at 20Hz, add 200g of base oil and 44.7g of diphenylmethane-4,4'-diisocyanate at the same time, control the addition time for 60min, and control the temperature at 95°C after the addition is complete, and react for 60min. After that, stir and heat, raise the temperature to 180°C, and keep the temperature constant for 1 hour. After that, heat to melt, add 100g of base oil to cool, when the temperature drops below 80°C, take out the kettle and grind it three times with a three-roller machine. The product performance indicators are as follows: Table 1 shows.

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