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Method for preparing detonation nanometer diamond dispersion

A technology of nano-diamond and dispersion liquid, which is applied in the field of preparation of nano-diamond dispersion liquid, can solve the problems of not being suitable for various media, no yield report, and few research reports, etc., and achieves easy storage and transportation, and high yield , The effect of simple preparation process

Active Publication Date: 2014-10-08
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, so far, there are not many research reports on the application of nanodiamonds in different application dispersion media, which can obtain simple process, high purity, high concentration, high yield, suitable for stable dispersion in different liquid media, and can meet the needs of different applications. The preparation method of nano-diamond dispersion has not been reported yet.
CN101898761A Chinese patent document uses pulsed laser bombardment of nano-diamond suspension and performs strong acid oxidation treatment on the product after laser bombardment to de-agglomerate the agglomerated detonation method nano-diamonds to obtain monodisperse diamond nanoparticles, but there is no yield report , and the cost is high, it is not suitable for a variety of media
CN102858683A Chinese patent literature reports a nano-diamond dispersion solution and its preparation method, which can be used in various media, but its drying process will affect the surface of nano-diamond particles, and will cause re-agglomeration at the same time. During the re-dispersion process, due to the introduction of Metal hydroxides also cause contamination and yields are not high

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  • Method for preparing detonation nanometer diamond dispersion
  • Method for preparing detonation nanometer diamond dispersion
  • Method for preparing detonation nanometer diamond dispersion

Examples

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Effect test

Embodiment 1

[0038] A kind of preparation method of detonation nano-diamond dispersion liquid (polar medium) of the present invention, comprises the following steps:

[0039] (1) First take by weighing 56g of commercially available nano-diamonds (see figure 1 ) and 2.8g sodium octadecyl sulfate, after mechanical stirring or ultrasonic dispersion in deionized water, the mass fraction is 2% dispersion; When the pressure reaches 200Mpa, spray the diamond target plate at high speed through the injector to break the nano-diamond aggregates, and collect the nano-diamonds after wet mechanochemical deagglomeration;

[0040] (2) the nano-diamond after the deagglomeration of step (1) is purified and removed with sulfuric acid, and centrifugal classification (450rpm, 40min) after cleaning is to remove coarse particles and other impurities to make the average particle size (D) of nano-diamond 50 ) is a water-based dispersion of 65nm (narrow particle size distribution) (see figure 2 ); the mass conc...

Embodiment 2

[0044] A kind of preparation method of detonation nano-diamond dispersion liquid (nonpolar medium) of the present invention, comprises the following steps:

[0045] (1) First weigh 50g of commercially available nano-diamonds (see figure 1 ), 2.0g sodium oleate and 2.0g glycerin, after mechanical stirring or ultrasonic dispersion in deionized water, make a dispersion with a mass fraction of 2%; Mechanochemical deagglomeration, collecting nano-diamonds after wet mechanochemical deagglomeration;

[0046] (2) Purify and remove impurities from the nano-diamonds deagglomerated in step (1) with hydrofluoric acid. After cleaning, use active cross-flow membrane separation equipment to classify to remove coarse particles (particle size exceeding 500nm) and other impurities. Active cross-flow The pressure applied by the type membrane separation equipment is 3.0bar, and the liquid flow velocity is 5.0m / s; the average particle size (D 50 ) is a water-based dispersion of 45nm (narrow part...

Embodiment 3

[0051] A kind of preparation method of detonation nano-diamond dispersion liquid (nonpolar medium) of the present invention, comprises the following steps:

[0052] (1) First take by weighing 56g of commercially available nano-diamonds (see figure 1 ) and 2.8g sodium hexametaphosphate, mechanically stirred or ultrasonically dispersed in deionized water to make a dispersion solution with a mass fraction of 2%; the dispersion solution of nano-diamonds was subjected to wet mechanochemical decomposition in deionized water by ball milling Agglomeration, collecting nanodiamonds after wet mechanochemical deagglomeration;

[0053] (2) the nano-diamond after the deagglomeration of step (1) is purified and removed with perchloric acid, and after cleaning, it is centrifugally classified to remove coarse particles (a particle diameter exceeding 500nm) and other impurities, and the average particle size (D) of the nano-diamond is made 50 ) is a water-based dispersion of 30nm (narrow parti...

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Abstract

The invention discloses a method for preparing detonation nanometer diamond dispersion. The method comprises the following steps: preliminarily dispersing commercially available nanometer diamond in deionized water, and performing mechano-chemical deagglomeration and chemical modification; purifying the nanometer diamond subjected to deagglomeration to remove impurities, cleaning and grading, and preparing water-based dispersion; selectively adding a corresponding concentrating agent for concentration according to the polarity or non-polarity of a subsequent selected dispersing solvent, and removing the supernatant; adding a polar solvent into the prepared concentrate, or adding a surface group conversion agent and a non-polar solvent, removing an aqueous phase after the nanometer diamond is converted to enter the non-polar solvent, adding a dispersion stabilizer, a pH value regulator and the like, performing ultrasonic treatment or stirring and dispersing, and preparing the polar or non-polar medium detonation nanometer diamond dispersion which can be stably stored. The process is simple, the prepared product is high in purity, high in concentration and high in yield and can be prepared into paste and aerosol, drying is not needed in the process, and the dispersion can be stably dispersed in different liquid media.

Description

technical field [0001] The invention relates to a nano-diamond dispersion technology, in particular to a method for preparing a nano-diamond dispersion liquid applicable in different media. Background technique [0002] Nanodiamond has the dual characteristics of nanomaterials and superhard materials. Its excellent mechanical, chemical, optical, electrical and thermal properties can be applied to running-in oil additives, ultra-precision polishing, electroplating additives, polymer resin additives, chemical / medical And heat sink and many other fields. The average single particle size of detonation nano-diamond is 8-10nm, the thickest is 60nm. However, the average particle size of commercial nano-diamond is above 2.0μm, the roughest is 10μm, and the degree of agglomeration is as high as 200-1000. This is mainly due to the High specific surface energy, in a thermodynamically unstable state, prone to aggregation, forming firm hard aggregates in the synthesis process and post-t...

Claims

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Application Information

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IPC IPC(8): C01B31/06
Inventor 王柏春谢圣中曹志群
Owner CHANGSHA RES INST OF MINING & METALLURGY
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