RU2591918C2 - Method of dispersing nano-sized copper powder in base engine oil - Google Patents

Abstract

FIELD: engines.

SUBSTANCE: invention relates to modification of lubricating materials, particularly to production of additives to motor oil, and can be used to increase wear resistance of friction parts. Method of producing copper-containing modifying additive for lubricating material involves addition of nano-sized copper powder with average particle size of 120 nm to base engine oil, soaking powder with base engine oil and dispersing by ultrasound vibrations in acoustic cavitation mode at resonant frequency of about 23 kHz.

EFFECT: higher quality of copper-containing modifying additives.

1 cl

Description

The most promising way to increase the durability and, accordingly, the reliability of machine components with a closed lubrication system is to modify the lubricants. This technology allows you to increase the wear resistance of rubbing parts at the lowest cost. As additives to motor oil to improve the functioning of mechanisms, nanosized copper powder can be used.

The present invention relates to a method for producing additives to motor oils based on nanoscale copper powder dispersed using ultrasound in a base engine oil.

The US invention “Nanostructured raw materials for thermal spraying” is known, patented in Russia (RU 98111495 A; С23С 4/12, В82В 1/00, В82В 3/00, 06/10/2000; applicants: University of Connecticut (US); Rutgers, State University of New Jersey (US); authors: Peter R. Stratt (US), Bernard H. Cyrus (US), Ross F. Bowland (US) The claims are composed of many points:

1. A method for producing agglomerated nanostructured particles, comprising: (a) dispersing a nanostructured material into a liquid medium by means of ultrasound; (b) adding an organic binder to the medium to form a solution; and (c) spray drying the solution to obtain agglomerated nanostructured particles.

10 (17). A method for producing nanostructured coatings, including: (a) ultrasonic dispersion of a nanostructured powder into a liquid medium; (b) adding an organic binder to said medium to form a solution; (c) spray drying of the solution, whereby agglomerated nanostructured particles are formed; and (d) spraying a coating of agglomerated nanostructured particles onto the article to form a nanostructured coating.

12. A method for producing a nanostructured coating, comprising: (a) ultrasonic dispersion of a nanostructured powder into a liquid medium; (b) injecting said dispersed solution directly into a spray gun for thermal spraying; and (c) spraying a coating of agglomerated nanostructured particles onto the article to form a nanostructured coating.

There is also known the composition and method for producing nanodispersed antiwear composition (NPSS) (RU 2008151517 A; С10М 177/00, В82В 1/00, 07/10/2010), and NDPS is a suspension of liquid lubricant and a suspension of highly dispersed minerals, while the suspension is obtained as follows: a set of natural minerals is preliminarily crushed in a mill to a powder, magnetic separation is carried out, it is introduced into a liquid lubricant, disintegrated to a particle size of minerals of not more than 1 μm, the resulting mixture is defended, and the resulting over sludge the suspension is used as an additive to the lubricant, and the set of natural minerals has the following ratio of components, wt. %:

Serpentine (lizardite and chrysotile) 80-87 Chlorite 2-3 Magnetite 1-2 Amakinite 1-2 Calcite 0.5-1 X-ray amorphous phase 8.5-12

and immediately before disintegration, surfactants are introduced into the liquid lubricant, forming a colloidal solution with particles of minerals during their dispersion. Before disintegration in a liquid lubricant, the powder is placed in a technological fluid and the resulting suspension of the powder and technological fluid is treated with ultrasound at a radiation power of at least 5 kW for a duration of at least 10 minutes, and then the technological fluid is removed, and then dispersed in liquid lubricant.

In both the first and second methods, organic binders are used to obtain a suspension upon dispersion by ultrasound. The composition of the proposed materials includes nanoscale substances.

Closest to the claimed invention relates to the invention of the Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences (IPPM SB RAS) "A method for producing a suspension of finely dispersed metal particles and their compounds and a device for its implementation" (RU 2012147093; B22F 9/04, B01J 3 / 00; 05/20/2014; authors: Lerner Marat Izrailevich (RU), Glazkova Elena Alekseevna (RU), Psakhye Sergey Grigoryevich (RU), Khorobraya Elena Gennadevna (RU), Ivanov Aleksey Nikolaevich (RU), Tsygankov Viktor Mikhailovich (RU), Tskhe Alexander Alekseevich (RU). Formula from acquisition consists of many points:

1. A method of obtaining a suspension of finely dispersed metal particles and their compounds, comprising mechanically mixing the powder, which is an aggregate of nanosized particles, and a dispersion medium and ultrasonic dispersion of the aggregates, while mechanical mixing and ultrasonic dispersion is carried out when moving the suspension in a closed hydraulic circuit so that either mechanical stirring of the suspension or ultrasonic dispersion was carried out sequentially.

2. The method according to p. 1, characterized in that the mixing is carried out using a mechanical stirrer with a frequency of 250-1000 rpm, preferably 280-500 rpm

3. The method according to p. 1, characterized in that the ultrasonic dispersion is carried out in a flow-through ultrasonic chamber with a radiation power of a piezoelectric transducer of 10-100 W, with an oscillation frequency of 22 kHz, in the time interval of 5-60 minutes, preferably 5-30 minutes

4. The method according to p. 3, characterized in that preferably the dispersion is carried out at a radiation power of the piezoelectric transducer from 80 to 100 watts.

5. The method according to p. 1, characterized in that the speed of movement of the suspension in a closed hydraulic system is 0.06-0.15 m / s, preferably 0.1-0.12 m / s.

6. The method according to p. 1, characterized in that in a closed hydraulic system create a small excess pressure from 1.0 to 1.2 ATM.

7. The method according to p. 1, characterized in that the temperature of the suspension is kept constant.

8. The method according to p. 1, characterized in that when dispersing a nanosized aluminum powder or aluminitride composition (AL / ALN), the temperature of the suspension is maintained at not higher than 30 ° C, preferably 20-22 ° C.

9. The method according to p. 1, characterized in that to achieve effective disaggregation using a suspension with an initial concentration of nanosized particles of 0.1-10.0 wt. %, preferably 0.5-3 wt. %

10. A device for producing a suspension of finely dispersed metal particles and their compounds contains a mixing tank in which a means for mechanical stirring is installed, and an ultrasonic flow chamber connected in series with each other by pipelines and means for moving the suspension through a closed hydraulic system.

11. The device according to p. 10, characterized in that as a means for moving the suspension through a closed hydraulic system contains a self-priming apparatus of rotary-pulsating action (RPA).

12. The device according to p. 10, characterized in that as a means for mixing contains a mechanical stirrer, preferably blade type.

13. The device according to p. 10, characterized in that the device further comprises means for monitoring the flow rate of the suspension, temperature, liquid level in the tank-mixer, a pressure sensor in the pipeline.

In the latter embodiment, ultrasound is used to disperse the nanostructured powder into a liquid medium, but a piezoelectric transducer with a radiation power of 80 to 100 W is used to carry out the process. Also, it does not indicate:

- the use of acoustic cavitation to achieve effective disaggregation and dispersion;

- use of a magnetostrictive transducer with attached waveguides;

- the use of nanoscale copper powder as a nanostructured material obtained on the basis of ITAM and INP SB RAS.

The essence of the invention:

The present invention relates to a method for producing additives to motor oils based on nanoscale copper powder dispersed using ultrasound in a base engine oil. After wetting the nanosized copper powder with base engine oil, the process of deagglomeration and dispersion is carried out using the energy of ultrasonic vibrations of the disperser IL100-6 / 1, which creates acoustic cavitation in the medium being processed at a resonant frequency of ≈ 23 kHz. Power ultrasonic installation 630 watts. Nanosized copper powder is obtained on the basis of ITAM and INP SB RAS. The average particle size of the powder is 120 nm.

To intensify the process of dispersing copper nanoparticles into the base engine oil, an ultrasonic disperser was used, operating in the mode of acoustic cavitation effect arising from the propagation of ultrasound in the medium. Ultrasonic installation IL100 / 6 (LLC Ultrasonic Engineering - Inlab, St. Petersburg). The installation consists of: an ultrasonic generator IL10-0.63; magnetostrictive transducer; interchangeable waveguides. The process proceeds as follows:

- liquid is poured into the container;

- the resonant frequency for a given liquid is selected;

- nano-sized copper powder is added in the required amount;

- the waveguide is completely immersed in the liquid;

- the process of dispersion is carried out.

The exposure time of ultrasound depends on the volume of the processed fluid and the concentration of the dispersible powder. The result is a suspension of nanoscale copper powder in the base engine oil, which differs in properties from a similar suspension obtained by simply mixing the nanopowder with the specified liquid. Comparative experiments were carried out, which showed that during the treatment with acoustic cavitation, the degree of deagglomeration of particles increases, and the sedimentation rate of the suspension decreases. Thus, the quality of the obtained copper-containing additives is improved. The base engine oil is used as the processed fluid, because it is compatible with all well-known brands of engine oils. Copper-containing additives are recommended for use in new internal combustion engines during running-in periods. Moreover, the technical result reflects the essence of the invention, which consists in improving the quality of the copper-containing modifying additive by increasing the degree of deagglomeration and dispersion of nanosized copper powder with an average particle size of 120 nm in the base engine oil. The presented effect is achieved due to the ultrasonic treatment of the suspension in the acoustic cavitation mode at a resonant frequency of the order of 23 kHz.

Claims (1)

A method for producing a copper-containing modifying additive for a lubricant, including adding nanosized copper powder with an average particle size of 120 nm to a base engine oil, wetting the powder with a base engine oil, and dispersing by ultrasonic vibrations in acoustic cavitation mode at a resonant frequency of about 23 kHz.