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Solvent-free silica nanofluid and application thereof

A silicon dioxide and fluid-like technology, which is applied in additives, petroleum industry, lubricating compositions, etc., can solve the problems that there are no public reports on ceramic nanoparticle-like fluid lubricants and lubricating oil additives, so as to improve processing and application performance, improve The effect of bearing capacity, good wear reduction and antiwear performance

Active Publication Date: 2018-05-29
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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  • Solvent-free silica nanofluid and application thereof
  • Solvent-free silica nanofluid and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) Weigh 10g of 30 wt% silica nanoparticle aqueous solution, disperse it in 40 mL of deionized water, sonicate 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- The aqueous solution of (trihydroxysilyl)propylmethylphosphonic acid monosodium salt was heated and stirred at 100° C. for 24 hours, washed and purified to obtain phosphonate-modified silica nanoparticles. It was dispersed in tetrahydrofuran solution, 40 mL of concentrated hydrochloric acid was added, the reaction was stirred at room temperature for 2 hours, the sodium chloride salt was removed by centrifugation, and the product was washed and evaporated to dryness to obtain phosphonic acid-modified silica nanoparticles. The phosphonic acid-modified silica nanoparticles were dissolved in deionized water, 30 g of 70 wt% M2070 aqueous solution was added, and the organic-modified silica nano-based fluid was obtained after heating and stirring at 100 °C for 24 h...

Embodiment 2

[0035] The silica nano-based fluid containing phosphonic acid functional groups obtained in Example 1 was used as the additive of 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 silica nano-based fluid containing phosphonic acid functional groups obtained in Example 1 was used as the additive of the base oil polyalphaolefin PAO4, and 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 silica 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 hailed as "the most promising material in the 21st century". However, nanomaterials are small in size, have high surface energy, are easy to agglomerate, and have poor binding force between the surface and the organic matrix. If unmodified nanoparticles are used directly, their characteristics and advantages cannot be fully exerted, which affects the output performance. Therefore, surface treatment of inorganic nanomaterials must be carried out to improve the dispersion stability of particles, prevent or reduce the occurrence of agglomeration, and main...

Claims

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Application Information

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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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