Urea-based lubricating grease composition with excellent antifriction property and preparation method therefor

A technology of grease composition and urea-based grease, which is applied in the field of grease, can solve problems such as complex preparation process and complex process, and achieve the effect of improving wear reduction ability and anti-oxidation ability

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, a large number of patents have discussed the performance of urea-based 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; CN1272530 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; CN1580211 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; CN1408825 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; CN101368129 The extreme pressure antiwear agent with borate is added to the system, which improves the comprehensive performance of the grease and reduces the cost; CN1657599 improves the oxidation stability of the grease by adding a calcium compound into the polyurea grease. The process is complex; CN101111591A involves tetraurea grease, but the preparation process is relatively complicated, and metal ions are also introduced, which will affect the oxidation stability of polyurea grease; CN101693851A uses a mixture of diurea, triurea, and tetraurea and introduces amide The grease prepared by salt thickener has excellent high temperature performance, anti-loss performance, and good extreme pressure and anti-wear properties; the thickener used in CN1056313 is a mixture of diurea and tetraurea, and the grease is more effective in long-term running machinery. excellent performance

Method used

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  • Urea-based lubricating grease composition with excellent antifriction property and preparation method therefor
  • Urea-based lubricating grease composition with excellent antifriction property and preparation method therefor
  • Urea-based lubricating grease composition with excellent antifriction property and preparation method therefor

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preparation example Construction

[0052] Among the present invention, the preparation method of the compound of structure shown in formula (I) preferably comprises:

[0053] (a) react aniline, sulfur chloride and 4-chloroaniline to generate intermediate M shown in formula (II),

[0054]

[0055] (b) carrying out nucleophilic substitution reaction between the intermediate M obtained in step (a) and dimercapto-1,3,4-thiadiazole under alkaline conditions to generate the multi-effect additive shown in formula (I),

[0056]

[0057] In step (a) of the present invention, the specific mode of reacting aniline, sulfur chloride and 4-chloroaniline preferably includes:

[0058] (i) fully reacting aniline and sulfur chloride at -20-0°C in the first solvent under an inert atmosphere;

[0059] (ii) Add 4-chloroaniline into the reaction system of step (i), and react at 15-30° C. for 1-3 h.

[0060] In the present invention, the inert atmosphere can be a conventional inert atmosphere in the field, for example, it can...

Embodiment

[0103] The following examples will further illustrate the present invention, but do not limit the present invention thereby.

[0104] In the following examples and comparative examples:

[0105] The method for monitoring the complete reaction: thin-layer chromatography (TLC) fluorescence color method.

[0106] Total yield = molar amount of final product / molar amount of aniline × 100%

[0107] The physical and chemical analysis method of the product: the element content was determined by inductively coupled plasma ion emission spectrometry.

[0108] Structural characterization method: NMR method ( 1 H spectrum, 13 C carbon spectrum), high-resolution mass spectrometry.

[0109] Test methods for each index: dropping point: GB / T3498; working penetration: GB / T269; extended working penetration: GB2360-1980; initial oxidation temperature: PDSC; steel mesh oil separation: SH / T0324; corrosion resistance: GB / T5018; water loss: SH / T0109; four-ball machine test PB, PD: SH / T0202; copp...

preparation example

[0111] Fill a 500ml flask with an electromagnetic stirrer (stirring speed is 300rpm) with nitrogen protection, add 150ml of dichloromethane, then add 0.2mol of sulfur chloride, fully cool in an ice-water bath, add 0.2mol of aniline . Remove the ice-water bath after monitoring until the reaction is complete, and place it at room temperature of 25°C. After the reaction system gradually rises to 25°C, add 4-chloroaniline in 3 times for reaction. The amount added each time is the same, and 4-chloroaniline is added in total 0.15mol. After the reaction was continued for 2 hours, 30ml of saturated brine was added to quench the reaction, and then the reaction system was transferred to a separatory funnel, washed with 50ml of distilled water and 50ml of saturated brine, and dried by adding 10g of anhydrous sodium sulfate at 25°C for 20min. The filtered filtrate was evaporated to remove the solvent at 40° C. and 0.05 MPa to obtain intermediate M1.

[0112] Fill a 500ml flask with an e...

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Abstract

The invention discloses a urea-based lubricating grease composition with excellent antifriction property. The lubricating grease composition contains the following ingredients in percentage by weight: 65-95wt% of lubricating base oil, 5-35wt% of urea-based thickener and 0.1-15wt% of additive, wherein the additive contains a compound with a structure represented by a formula (I) shown in the description. The invention further provides a preparation method for the urea-based lubricating grease composition with excellent antifriction property. The urea-based lubricating grease composition disclosed by the invention contains the multipurpose additive, so that the antifriction capability and oxidation resistance of lubricating grease are greatly improved. The lubricating grease disclosed by the invention has excellent high-temperature properties, mechanical stability, oxidation resistance, colloid stability, waterproofing performance, bearing capacity, antifriction property and the like and can be adequate to harsh working conditions, such as high-temperature, high-speed, high-load and watery.

Description

technical field [0001] The invention relates to the field of lubricating grease, in particular to a urea-based lubricating grease composition containing a specific additive with excellent wear-reducing performance 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 has a particularly long service life. It is a multi-effect grease that can be prepared to meet different requirements for use. It is suitable for 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] Urea-based g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/06C10M169/00C10M177/00C10N30/10C10N30/06C10N50/10
Inventor 陈政孙洪伟郑会段庆华张建荣刘中其姜靓何懿峰
Owner CHINA PETROLEUM & CHEM CORP
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