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: 2015-04-29
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
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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

Method used

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  • Polyurea lubricating grease and preparation method thereof
  • Polyurea lubricating grease and preparation method thereof
  • Polyurea lubricating grease and preparation method thereof

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[0067] In the second aspect, the present invention provides a method for preparing polyurea grease as described above, the method comprising: uniformly mixing graphene, polyurea compound and part of base oil, refining at a constant temperature of 180-230°C, cooling, adding The remaining base oil is added with necessary additives 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] It should be understood by those skilled in the art that the sum of the amount of part of base oil and the amount of balance base oil is the total amount of base oil used. In the present invention, the weight ratio of part of base oil and balance base oil is preferably 1: 0.1-0.5.

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

[0071] (1) Mix and heat part of gr...

Embodiment 1

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

[0109] Preparation of graphene: Add 0.1g of graphene oxide prepared above into 100ml of water for ultrasonic dispersion (ultrason...

Embodiment 2

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

[0115] Preparation of graphene: Add 0.1g of prepared graphene oxide into 100ml of water for ultrasonic dispersion (ultrasonic frequency 35kHz) for 30min, then add 5ml of hydrazine hydrate (mass concentration is 85%), react in oil bath at 100°C for 24h, and finally obtain The powder obtained after the black flocculent precipitate is washed with water, suction filtered and dried is graphene, and 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 (viscosity of 20mm at 100°C 2 / s); octadecylamine 8.51kg; p-toluidine 3.26kg; TDI 5.51kg; 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, heat to 80°C to completely melt the organic amine; then add 5.51kg of TDI, 1.5kg of Gr...

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Abstract

The invention discloses polyurea lubricating grease, which is characterized in that based on the weight of the lubricating grease, the lubricating grease comprises the following components: 0.2-15% of grapheme, 4-30% of a polyurea compound, 65-95% of base oil and 0.5-15% of an additive. The invention also discloses a preparation method of the polyurea lubricating grease and the prepared polyurea lubricating grease. The polyurea lubricating grease disclosed by the invention not only has excellent corrosion resistance and salt fog resistance, but also has the properties such as excellent heat temperature resistance, water resistance, adhesivity, colloid stability and extreme pressure antiwear property, and has a long service life. The polyurea lubricating grease disclosed by the invention is simple in preparation process, environmental friendly, low in cost and stable in product quality.

Description

technical field [0001] The invention relates to lubricating grease, in particular to a polyurea lubricating grease and a preparation method thereof. Background technique [0002] Urea-based grease is obtained by thickening mineral oil or synthetic oil with urea, an organic compound. 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 other excellent properties, and also has a particularly long service life. It is a multi-effect grease that can be prepared to meet different requirements for use. It is used in high temperature, low temperature, high load, and wide speed range. It is widely used in electrical appliances, metallurgy, food, automobile, paper making and other industries where it is in contact with bad media. [0003] In recent years, there have been a large number of patents to discuss the performance of diurea grease, such as...

Claims

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Application Information

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Patent Type & Authority Applications(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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