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Modified carbon nanofibers, preparation method thereof and lubricating grease

A nano carbon fiber, carbon fiber technology, applied in lubricating compositions, petroleum industry, additives, etc., to achieve the effect of extending service life, high diffusivity, and reducing temperature

Active Publication Date: 2020-05-29
SHENZHEN EUBO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a modified nano-carbon fiber and its preparation method and lubricating grease, aiming to solve the improvement needs of existing lubricating greases for anti-friction and anti-wear performance and environmental protection

Method used

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  • Modified carbon nanofibers, preparation method thereof and lubricating grease
  • Modified carbon nanofibers, preparation method thereof and lubricating grease
  • Modified carbon nanofibers, preparation method thereof and lubricating grease

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preparation example Construction

[0033] The embodiment of the present invention provides a method for preparing modified carbon nanofibers, comprising the following steps:

[0034] S1. Carbon nanofibers are subjected to carboxylation and amination reactions to obtain aminated carbon nanofibers;

[0035] S2. Aminated carbon nanofibers are reacted with oil-soluble borate to obtain modified carbon nanofibers;

[0036] The structural formula of oil-soluble borate is as shown in formula (I), wherein, R is an alkyl group, and n is an integer of ≥ 1;

[0037]

[0038] In the preparation method of the modified nano-carbon fiber of the present invention, the nano-carbon fiber undergoes carboxylation reaction and amination reaction, and the surface of the obtained aminated nano-carbon fiber has abundant amino groups, which can not only realize the compound reaction with oil-soluble borate ester, but also has relatively Strong metal adsorption; secondly, the present invention aminated carbon nanofiber (CFs-NH 2 ) r...

Embodiment 1

[0061] A preparation method of modified carbon nanofibers, comprising the steps of:

[0062] 1) Preparation of aminated carbon nanofibers (CFs-NH 2 )

[0063] S01: carbon nanofiber (diameter D 50 =50nm, length L 50 =30um) placed in a Soxhlet reflux device, using acetone to reflux at 70°C for 48 hours to remove the slurry, followed by drying in a 60°C oven for 8 hours;

[0064] S02: Place the dried carbon nanofibers in a mixed acid with a volume ratio of concentrated sulfuric acid and concentrated nitric acid of 3:1, react in a water bath at 80°C for 8 hours, then dissolve the mixture in distilled water and filter it repeatedly until it is neutral, then bake dry to obtain oxidized carbon nanofibers with higher purity;

[0065]S03: Dissolve 0.5g of oxidized nano-carbon fiber in 100ml of distilled water, sonicate for 30min, adjust the pH of the solution to 11 with ammonia water, and keep stirring, then heat in an oil bath for 90°C; add 100ml of ethylenediamine, stir at consta...

Embodiment 2

[0072] Example 2 is basically the same as Example 1, except that the diameter of carbon nanofibers in the preparation of aminated carbon nanofibers is D 50 = 100nm, length L 50 = 100um.

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Abstract

The invention belongs to the technical field of lubricating materials, and particularly relates to modified carbon nanofibers, a preparation method thereof and a lubricating grease. The modified carbon nanofibers are obtained by performing a carboxylation reaction and an amination reaction on carbon nanofibers to obtain aminated carbon nanofibers and then performing a combination reaction on the aminated carbon nanofibers and an oil-soluble borate, the structural formula of the oil-soluble borate is shown as a formula (I), wherein R is alkyl, and n is an integer larger than or equal to 1. According to the preparation method, the carbon nanofibers are modified by the oil-soluble borate; the modified carbon nanofibers have the effects of being environmentally friendly and capable of improving the oil solubility of the carbon nanofibers and the dispersity of the carbon nanofibers in the lubricating grease, the obtained lubricating grease containing the modified carbon nanofibers has goodwear resistance, extreme pressure property, thermal stability, thermal conductivity and oxidation resistance, and the colloid limit strength of the lubricating grease is also remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lubricating materials, and in particular relates to a modified nano-carbon fiber, a preparation method thereof and lubricating grease. Background technique [0002] Grease is a semi-solid substance. If the external force it receives is not large, it will only deform plastically and not flow; when the external force gradually increases and reaches a certain critical value, the grease will start to flow. The minimum force required to make the grease flow is called the strength limit of the grease. [0003] The strength limit is of great significance to the use of lubricating grease. If the strength limit of the grease is too small, it is easy to flow out or slip when used on an unsealed friction part or a vertical surface; when used in a high-speed rotating machine, if the strength limit is too If it is small, it will also be thrown out by centrifugal force. In addition, the high and low temperature perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M139/00C10M169/04C10N30/06C10N30/10
CPCC10M139/00C10M169/04C10M2227/062
Inventor 胡秋波李士成童蓉龚德岳树伟岳风树
Owner SHENZHEN EUBO NEW MATERIAL TECH