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A kind of polyurea lubricating grease and preparation method thereof

A technology of polyurea grease and polyurea, applied in the field of grease, can solve the problems of related research without graphene application, affecting the oxidation stability of polyurea grease, complicated preparation process, etc., so as to achieve shortened saponification time and good colloid Stability, and the effect of increasing the speed of fat formation

Active Publication Date: 2018-04-13
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, there have been a large number of patents to discuss the performance of diurea grease, such as US5158694 to prepare polyurea grease by reacting diisocyanate with water and amine, but the dropping point of its product is between 230-260 ° C; CN1272530A in the presence of base oil , react C8-C24 fatty amine with excess diisocyanate, neutralize the unreacted diisocyanate with water, continue the reaction until the temperature is 130-200°C, the dropping point of diurea grease prepared by this method reaches 260-330°C; CN1580211A mixes and reacts organic amine and isocyanate. After the temperature of the material rises to 100-150 ° C, add quenching oil to cool the material rapidly and grind it into grease. The urea-based grease prepared by this method has a stable vibration value; CN1408825A is in Mix base oil, alkylamine and excess diisocyanate at 50-120°C for reaction, add excess water to neutralize unreacted diisocyanate, heat up to melt, add quenching oil, cool out of the kettle to obtain lubricating grease with transparent appearance; CN101368129A The extreme pressure antiwear agent with borate is added to the system, which improves the overall performance of the grease and reduces the cost; CN1657599A improves the oxidation stability of the grease by adding a calcium compound into the polyurea grease, and its Complex process
CN101111591A has mentioned tetraurea grease, but preparation process is more complicated, and also introduced metal ion, and this will affect the oxidation stability of polyurea grease; CN101693851A adopts the mixture of diurea, triurea, tetraurea and introduces amide salt thickening The grease prepared by the thickening agent has excellent high-temperature performance, loss resistance, and good extreme pressure and anti-wear properties; the thickener used in CN1056313A is a mixture of diurea and tetraurea, and the grease has excellent performance in long-term running machinery
Nanomaterials are also gradually used in the application of grease, such as nano-silica, nano-diamond, nano-titanium dioxide, nano-zinc oxide, etc., but there is still no research on the application of graphene in grease

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  • A kind of polyurea lubricating grease and preparation method thereof
  • A kind of polyurea lubricating grease and preparation method thereof
  • A kind of polyurea lubricating grease and preparation method thereof

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preparation example Construction

[0067] In the second aspect, the present invention provides a method for preparing polyurea grease as described above, which includes: mixing graphene, polyurea compound and part of base oil uniformly, refining at a constant temperature of 180-230°C, cooling, and adding Add the necessary additives to the remaining base oil to obtain the finished product.

[0068] In the present invention, the graphene, polyurea compound, and base oil are as described above, and will not be repeated here.

[0069] Those skilled in the art should understand that the sum of the amount of part of the base oil and the amount of the remaining base oil is the total amount of base oil used. In the present invention, the weight ratio of the part of the base oil to the remaining base oil is preferably 1: 0.1-0.5.

[0070] In the third aspect, the present invention provides a method for preparing a polyurea grease whose polyurea compound is a dipolyurea, the method comprising:

[0071] (1) Mix part of the graph...

Embodiment 1

[0108] Preparation of graphene oxide: mix 1g graphite flakes, 0.5g sodium nitrate and 23ml concentrated sulfuric acid in an ice bath, slowly add 3g potassium permanganate with stirring, keep the temperature below 10℃ and stir for 1h, then the mixture is kept at 35℃ Stir for 0.5h, then add 50ml deionized water to dilute, release a lot of heat during the process, keep the temperature below 100℃ in an ice bath, add 50ml water, stir the mixture for 0.5h, add 200ml deionized water for further dilution. Then, 10 ml of 30% by weight aqueous hydrogen peroxide solution was added to reduce potassium permanganate. Finally, the mixture was washed and filtered with 5% hydrochloric acid (400ml) to remove metal ions. Then, 0.5L of deionized water was used to remove the acid and dried at 60°C for 24 hours to obtain graphene oxide.

[0109] Preparation of graphene: add 0.1g of the graphene oxide prepared above into 100ml of water and ultrasonically disperse (ultrasonic frequency is 30kHz) for 30...

Embodiment 2

[0114] The preparation of graphene oxide is the same as in Example 1.

[0115] Preparation of graphene: add 0.1g of the prepared graphene oxide to 100ml of water for ultrasonic dispersion (ultrasonic frequency is 35kHz) for 30min, then add 5ml of hydrazine hydrate (mass concentration of 85%), and react at 100℃ for 24h in an oil bath. The black flocculent precipitate is washed with water, filtered by suction, and dried to obtain graphene. The properties of graphene are shown in Table 2 below.

[0116] Preparation of diurea grease:

[0117] Raw material components: Graphene 2kg; 500SN and minus three-line mixed oil: 62.4kg (100°C viscosity 20mm 2 / s); octadecylamine 8.51kg; p-toluidine 3.26kg; TDI5.51kg; 0.96kg of antioxidant T501; 0.64kg of T406.

[0118] First add 0.5kg of graphene, 8.51kg of octadecylamine and 3.26kg of p-toluidine to 20.4kg of base oil, and heat to 80℃ to melt the organic amine completely; then add 5.51kg of TDI, 1.5kg to 21kg of base oil Heat graphene to melt; mix...

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Abstract

The invention discloses a polyurea grease, which is characterized in that, based on the weight of the grease, it comprises the following components: 0.2-15% by weight of graphene; 4-30% by weight of polyurea compound; 65-95% by weight % of base oil and 0.5‑15% by weight of additives. The invention also discloses a preparation method of the polyurea grease and the prepared polyurea grease. The polyurea grease of the present invention not only has excellent corrosion resistance and salt spray resistance, but also has excellent properties such as high temperature resistance, water resistance, adhesion, colloid stability, extreme pressure and anti-wear properties, and Long lubrication life. The preparation process of the lubricating grease of the invention is simple, environment-friendly, low in cost and stable in product quality.

Description

Technical field [0001] The present invention relates to grease, in particular, to a polyurea grease and a preparation method thereof. Background technique [0002] Urea-based grease is derived from organic compound urea thickened mineral oil or synthetic oil. The thickener does not contain metal ions, which avoids the catalytic effect of metal ions on the oxidation of base oil. Urea-based grease has good oxidation stability, Thermal stability and various other excellent properties, as well as a particularly long service life. It is a multi-effect grease. Various greases can be prepared to meet different requirements. It can be used in high temperature, low temperature, high load, and wide speed range. It is widely used in electrical appliances, metallurgy, food, automobiles, papermaking and other industries where it is in contact with bad media. [0003] In recent years, there are a large number of patents discussing the performance of diurea grease. For example, US5158694 prepare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M113/02C10M123/02
Inventor 孙洪伟么佳耀郑会何懿峰段庆华张建荣陈政刘中其姜靓
Owner CHINA PETROLEUM & CHEM CORP
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