RU2514919C1 - Grease - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to grease based on mineral oils or mixtures thereof, containing fine filler materials, wherein the grease is modified with iron nanoparticles, formed after mixing in a reactor with mixer rate of 1000-2500 rpm with liquid iron pentacarbonyl and further thermal decomposition thereof at temperature of 250-300°C with a working mixture for 30-120 minutes, and a ternary mixture powdered filler materials - graphite (A), molybdenum disulphide (B) and tetrafluoroethylene (C) - is then added to the obtained mass in the same reactor in ratio A:B:C ranging from 40:40:20 to 80:10:10, wherein the grease contains the following, pts.wt: mineral oil or mixture of mineral oils 100, iron nanoparticles 0.3-4.0 and ternary mixture of powdered filler materials 15-60.

EFFECT: obtaining grease with improved temperature, anti-friction and strength properties.

1 ex, 2 tbl

Description

The invention relates to the field of creating lubricants used in railway transport to reduce wear of rail tracks, wheel flanges of locomotives, and also as protective equipment for rolling units of wheeled and tracked vehicles and other purposes.

The closest prototype of the claimed invention is a plastic lubricant and a method for its production, which consists in the fact that the composition of the lubricant type "Litol" is introduced highly dispersed powder of non-ferrous metals or their alloys, with a particle size of up to 20 microns, obtained by evaporation in a vacuum installation, in the amount of 0 , 05-0.1% by weight of “Litol” by co-mixing them in a paddle mixer for 2-3 hours (see patent RU 22267520, published 2006.01.10).

The disadvantages of this method is the predicted irreproducibility of the results, because The experience of the chemical industry shows that 0.05-0.1% of additives in a paddle mixer cannot be uniformly dispersed (for this purpose either ultrasonic dispersers or mixers with a speed of at least 2500 rpm are used), in addition, the processes of obtaining the metal powders by evaporation in a vacuum installation, as well as their effective dispersion in small quantities are energy-intensive and very expensive processes, which does not allow them to be used for mass production. Introduced powders, especially in amounts of 0.05-0.1%, cannot prevent the process of frictional corrosion occurring on the surface of parts, because iron oxidation can be inhibited by a reduction process that does not occur with the introduction of metal powders.

The purpose of the proposed technical solution is a grease based on oil products and additives, providing improved performance characteristics of the working high-speed friction pairs in the temperature range - 60 ÷ 200 ° C.

This goal is achieved in that this grease is modified by iron nanoparticles formed after mixing in a reactor with a high-speed mixer from 1000 to 2500 rpm with liquid iron pentacarbonyl and its further thermal decomposition at a temperature of 250-300 ° C with a working mixer for 30 -120 minutes, and then in the same reactor, a triple mixture of powder fillers - graphite (A), molybdenum disulfide (B) and polytetrafluoroethylene (C) in the ratio A: B: C from 40:40:20 to 80 is added to the resulting mass; 10:10, while it contains in mass parts:

Mineral oil or a mixture of mineral oils one hundred Iron nanoparticles 0.3-4.0 Triple filler mix 15-60

Example 1

In the workshop, they produce an antifriction compound by modifying mineral oil based on saturated hydrocarbons - a mixture of grade 2 solidol and grade P-2 paraffin, in a ratio of 60:40.

The mixture is loaded into a reactor with heating and a high-speed stirrer (2000 rpm) and at a temperature of 120 ° C liquid pentacarbonyl iron is poured onto it based on 100 parts by weight a mixture of 3 parts by weight pentacarbonyl iron. After stirring for 20 minutes, the temperature was raised to 250 ° C and for 30 minutes the mixture was stirred at 2000 rpm. In this case, a gradual decomposition of iron pentacarbonyl into iron atoms occurs - 2 parts by weight and CO molecules — 6 parts by weight Under these conditions, iron atoms are combined into nanosized particles 10-40 nm in size, isolated by saturated hydrocarbon molecules, preventing their rapid oxidation by atmospheric oxygen, accompanied by an explosion. The mineral oil mixture modified in this way is cooled to 100 ° C and a triple mixture of powder fillers with a particle size of 5-15 microns - graphite (A), molybdenum disulfide (B), fluoroplastic - 4 MBp in the ratio A: B: C = 60 is introduced: 25:15 in the amount of 40 parts by weight per 100 parts by weight mixtures of mineral oils and after stirring for 20 minutes, the mass is loaded into a metal container.

Examples 2-5 are carried out analogously to example 1 with a change in values and parameters according to table 1. The properties of the coating are shown in table 2.

Table 1 The parameters and compositions in the implementation of the proposed method according to examples 2-5 Name of parameter and composition The value of the parameter and the composition of the examples 2 3 four Type or mixture of mineral oils Ceresin Solidol Zh-2 A mixture of solid oil, paraffin and petroleum jelly 20:60:20 The number of iron nanoparticles formed from iron pentacarbonyl per 100 mass parts of mineral oil four 0.3 2 Modification Mode: Total time min 120 60 90 Temperature ° C 250 300 250 The number of revolutions of the mixer in min 2500 1000 1500 The amount of ternary mixture fifteen 60 40 The ratio of components in the ternary mixture Graphite: MoS ₂ : polytetrafluoroethylene 40:40:20 80:10:10 60:20:20 table 2 Properties of antifriction coatings obtained by the claimed method according to examples 1-5. Name of indicator The value of the indicator for examples one 2 3 four Wear spot on four ball tribometer, mm 0.6 0.55 0.55 0.6 Permissible operating temperature range, ° C -60 ÷ 250 -60 ÷ 270 -60 ÷ 260 -60 ÷ 270

Claims (1)

Grease based on mineral oils or mixtures thereof containing highly dispersed fillers, characterized in that it is modified by iron nanoparticles formed after mixing in a reactor with a high-speed stirrer from 1000 to 2500 rpm with liquid iron pentacarbonyl and its further thermal decomposition at temperature 250-300 ° C with a working mixer for 30-120 minutes, and then in the same reactor, a triple mixture of powder fillers - graphite (A), molybdenum disulfide (B) and tetra is added to the resulting mass toretilena (B) in a ratio of A: B: B of 40:40:20 to 80:10:10, wherein it comprises, in parts by weight:
Mineral oil or a mixture of mineral oils one hundred Iron nanoparticles 0.3-4.0 Triple filler mix 15-60