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A kind of solvent-free silicon dioxide nanometer fluid and its application

A silicon dioxide, fluid-like technology, applied in the directions of additives, lubricating compositions, petroleum industry, etc., can solve the problem of no ceramic nano-particle fluid lubricants and lubricating oil additives publicly reported, etc., to improve processing and application performance, improve The effect of boundary lubrication performance, good anti-wear and anti-wear performance

Active Publication Date: 2020-12-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Physical and chemical modification can solve the problem of self-agglomeration of nanoparticles due to high surface energy to a certain extent, but previous studies have shown that surface-modified nanoparticles are often in a solid state, which improves the long-term stability of modified nanoparticles in solvents. Stability remains a challenge
However, there are no published reports of ceramic nanoparticle-based fluids as lubricants and lubricating oil additives

Method used

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  • A kind of solvent-free silicon dioxide nanometer fluid and its application
  • A kind of solvent-free silicon dioxide nanometer fluid and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh 10 g of 30 wt% silica nanoparticle aqueous solution, disperse in 40 mL of deionized water, ultrasonicate for 30 minutes, adjust the pH of the solution to 9 with 2 mol / L sodium hydroxide, add 10.0 g of 50 wt% 3- (Trihydroxysilyl) propyl methylphosphonic acid monosodium salt aqueous solution, heated and stirred at 100°C for 24 hours, washed and purified to obtain phosphonate-modified silica nanoparticles. Disperse it in tetrahydrofuran solution, then add 40 mL of concentrated hydrochloric acid, stir and react at room temperature for 2 hours, centrifuge to remove sodium chloride salt, wash and spin dry the product, and obtain phosphonic acid-modified silica nanoparticles. Dissolve phosphonic acid-modified silica nanoparticles in deionized water, add 30 g of 70 wt% M2070 aqueous solution, heat and stir at 100 °C for 24 hours to obtain organic-modified silica nano-fluids. Wash and filter with deionized water, ethanol and tetrahydrofuran to remove impurities, then fu...

Embodiment 2

[0035] The silicon dioxide nano-fluid containing phosphonic acid functional groups obtained in Example 1 was used as an additive to the base oil polyethylene glycol PEG (Mw ~ 400), the addition amount was 5 wt%, and the lubricant was obtained by ultrasonic dispersion and dissolution to investigate its friction academic performance.

Embodiment 3

[0037] The silicon dioxide nano-fluid containing phosphonic acid functional groups obtained in Example 1 was used as the additive of the base oil polyalphaolefin PAO4, the addition amount was 5 wt%, and the lubricant was obtained by ultrasonic dispersion to investigate its tribological properties.

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Abstract

The invention discloses solvent-free silica nanofluid. The solvent-free silica nanofluid is characterized in that inorganic silica nanoparticles are modified by covalent bonds through a phosphonic acid functional group carrying surface modifying agent; amine-terminated block low polymer is grafted to the modified silica surface through an ionic bond; the grafted shell structure is capable of obviously inhibiting the agglomeration of nanoparticles, and thus a novel functional nano material with liquidlike fluid behavior and being stable in a long term can be obtained. The invention further discloses application of such fluid. The silica nanofluid can be used as a lubricating agent and a basic oil additive and is outstanding in friction reduction and abrasion resistance; the introduced phosphonic acid functional group is easily adsorbed to the surface of a friction substrate through electrostatic, thus an organic-inorganic hybrid structural double electrical layer can be formed, and thelubricating capacity of an adsorbing film is improved; meanwhile, the silica nanoparticles are accumulated on the interface, so that the bearing capacity of a frictional chemical reaction film is improved, and the boundary lubricating performance of a friction pair is improved.

Description

technical field [0001] The invention belongs to the technical field of lubricants, and relates to a solvent-free silicon dioxide nanometer fluid and an application thereof. Background technique [0002] Nanomaterials have many unique physical and chemical properties, such as quantum size effect, small size effect and surface effect, and have broad application prospects in light, electricity, heat, magnetism, catalysis, etc. It will be praised as "the most promising material in the 21st century". However, nanomaterials are small in size, high in surface energy, easy to agglomerate, and have poor binding force between the surface and the organic matrix. If the unmodified nanoparticles are used directly, their characteristics and advantages cannot be fully utilized, which will affect the output performance. Therefore, surface treatment of inorganic nanomaterials is necessary to improve the dispersion stability of particles, prevent or reduce agglomeration, and maintain inheren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M125/26C10M169/04C10M153/04C10N30/06C10N40/16
CPCC10M125/26C10M153/04C10M169/04C10M2201/14C10M2205/0285C10M2205/163C10M2209/1045C10M2225/04C10M2229/0405C10N2020/06C10N2030/06C10N2040/16
Inventor 张嘎郭月霞张利刚王齐华王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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