Pre-prepared thickening agent containing nano-zinc oxide and lubricating grease composition obtained by same

A lubricating grease composition, nano-zinc oxide technology, applied in the field of lubricating grease, can solve problems such as uncontrollable nano-particle agglomeration, achieve the effects of prolonging the grease change cycle, excellent friction reduction, and improving reaction efficiency

Active Publication Date: 2021-05-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a prefabricated thickener containing high-efficiency anti-friction and anti-wear nano-zinc oxide additives and the resulting grease composition, the prefabricated thickener is prepared from 12-hydroxyzinc stearate and lithium hydroxide It solves the technical problem that nano-zinc oxide additives in the prior art can only be added to lubricating grease through an external method, and additional dispersion methods are required, and the agglomeration of nanoparticles cannot be controlled.

Method used

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  • Pre-prepared thickening agent containing nano-zinc oxide and lubricating grease composition obtained by same
  • Pre-prepared thickening agent containing nano-zinc oxide and lubricating grease composition obtained by same
  • Pre-prepared thickening agent containing nano-zinc oxide and lubricating grease composition obtained by same

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: A kind of prefabricated thickener containing nanometer zinc oxide

[0028] See attached figure 1 In the process flow shown, 10.00g 12-hydroxystearic acid zinc and 0.10g phenolphthalein were dissolved in 20-50mL ethanol as an acid-base indicator, and 1.27g LiOH.H 2 O is configured as a mixed solution of ethanol and water, and LiOH.H 2 The O solution was slowly and dropwise added to the upper 12-hydroxyzinc stearate system until reaching the end of the reaction. After the above system continued to react for 2 hours, the solid powder was separated by filtration, washed (5 times, using 20 mL of ethanol for each washing), and dried at 60° C. to obtain a solid powder, which is a prefabricated thickener powder containing nano-zinc oxide. The microscopic morphology and XRD data of the obtained prefabricated thickener are shown in the appendix image 3 And attached Figure 4 . attached by image 3 It can be seen that the nano-zinc oxide material is distribute...

Embodiment 2

[0029] Embodiment 2: Preparation of blank comparative example grease composition

[0030] See attached figure 2 In the process flow shown, 10.0g of prefabricated thickener soap powder 12-hydroxystearate lithium not containing nano-zinc oxide is added to 80g of synthetic ester base oil diisooctyl sebacate at 100°C (Kinematic viscosity: 25mPa.s at 20°C). After stirring and mixing for 20-30 minutes, the system was heated up to 210°C. At this time, the system was in a slightly transparent state and kept for 10 minutes. Subsequently, the temperature was lowered to 180° C. and kept for 30 minutes, then slowly cooled to room temperature, and the grease composition was obtained after grinding and homogenizing.

Embodiment 3

[0031] Embodiment 3: preparation lubricating grease composition

[0032] See attached figure 2 Shown technological process, the thickening agent prefabricated soap powder in 10.0g embodiment 1 is added in the synthetic ester base oil diisooctyl sebacate of 80g in 100 ℃ (kinematic viscosity: 20 ℃ is 25mPa .s), after stirring and mixing for 20-30 minutes, the temperature of the system was raised to 210°C. At this time, the system was in a slightly transparent state and kept for 10 minutes. Subsequently, the temperature was lowered to 180° C. and kept for 30 minutes, then slowly cooled to room temperature, and the grease composition was obtained after grinding and homogenizing. attached by Figure 5 It can be seen that the lubricating grease composition containing nano zinc oxide has a smaller viscosity in the low temperature region, showing better low temperature fluidity. And it has better thixotropy and structural recoverability.

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Abstract

The invention relates to an in-situ preparation technology of an efficient anti-friction and anti-wear nano-material additive and a lubricating grease composition obtained by the same. The lubricating grease composition consists of lithium 12-hydroxystearate, base oil and a nano additive. The in-situ preparation method of an efficient anti-friction and anti-wear nano additive, which comprises the following step of: in a proper solvent environment, directly obtaining a prefabricated thickening agent system containing small-size nano zinc oxide and lithium 12-hydroxystearate by a one-step method through double decomposition reaction between zinc 12-hydroxystearate and lithium hydroxide monohydrate. The in-situ preparation technology of the efficient anti-friction and anti-wear agent provided by the invention has the beneficial effects of high efficiency, good controllability, good dispersibility, organic combination with the lubricating grease preparation process and the like, and the obtained lubricating grease composition shows excellent tribological properties, good low-temperature viscosity and longer service life.

Description

technical field [0001] The invention relates to the technical field of lubricating grease, in particular to a prefabricated thickener containing nanometer zinc oxide and a lubricating grease composition obtained therefrom. Background technique [0002] The special physical and chemical properties of nanoparticles have aroused great interest in the field of tribology, especially in lubricant additives. With the rise and development of nanotechnology and nanotribology, the research of nanoparticles in the field of lubrication has also made great achievements. In situ self-healing provides a completely new approach. In addition, some nanoparticles exhibit good environmental friendliness, and these advantages accelerate the research of nanoparticles as grease additives. The lubricating performance of nanoparticles has been confirmed by many friction tests, and its lubricating mechanism has also been studied, but its specific mechanism of action is still in the stage of specula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M123/02C10M169/02C10N50/10C10N30/06C10N30/12
CPCC10M123/02C10M169/02C10M2201/0626C10M2207/1285C10M2207/2825C10M2203/1025C10M2205/0206
Inventor 王晓波华振涛来冰冰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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