RU2673482C1 - Liquid oligomethyloroxyl siloxanes and oligoethyloxylicyloxanes based lubricating oil - Google Patents

Abstract

FIELD: instrument engineering.SUBSTANCE: present invention relates to the silicone-based liquid lubricating compositions, in particular, to the mixed lubricating oils based on oligomethyl octyl or oligoethyl octyl siloxane base in combination with petroleum oil and/or complex organic ether, which find application in various industries to ensure the friction units operation in the extended temperature range and as the greases basis. Lubricating oil for the products and mechanisms stable operation, in which steel-steel friction pairs are present, based on oligoorganosiloxanes, where as the oligoorganosiloxane the oligomethyl octyl and oligoethyl octyl siloxane liquids are contained with viscosity of 100÷300 mm/s at 20 °C, petroleum oil with viscosity of 6÷110 mm/s at 40 °C and/or dicarboxylic ester (bis-(2-ethylhexyl)sebacic acid ester – DOS) with the following content of components, wt. %: oligomethyl octyl or oligoethyl octyl siloxane 40–80, mineral oil and/or DOS 20–60.EFFECT: inventions find application in various industries to ensure the friction units operation in the extended temperature range and as the basis of greases.1 cl, 9 ex, 3 tbl

Description

The invention relates to liquid lubricant compositions on an organosilicon basis, in particular to mixed lubricating oils based on oligomethyloctyl or oligoethyl ethyl siloxane base in combination with petroleum oil and / or organic ester, which are used in various industries to ensure the operation of friction units in an extended temperature range and as the basis of greases.

Silicone mixed oils are prepared on the basis of polymethylsiloxane liquids using various additives. At the same time, the base does not have acceptable compatibility properties with mineral and synthetic hydrocarbon media, and additive response, which complicates the use of polymethylsiloxanes in the industry in the production of lubricating oils.

Known instrument oils using liquid polyethylsiloxanes as a base component (Aut. St. USSR No. 184996, IPC С10М 169/02, С10М 105 /, С10М 107/50, 1966; Aut. St. USSR No. 248881, IPC С10М 131 / 12, C10M 129/40, С10М 101/02, 1969; Aut. St. USSR No. 293840, IPC С10М 101/02, С10М 107/50, 1971). These liquids, having high values of the contact angle, are favorable for drip lubrication, but they are not applicable for the lubrication of widespread friction units, including steel-steel friction pairs.

Lubricating oils based on polyethylsiloxanes are known (Aut. St. USSR No. 859428, IPC С10М 129/02, С10М 107/50, 1981; Aut. St. USSR No. 1004456, IPC С10М 135/36, С10М 107/50, 1983 g), which have satisfactory lubricating characteristics when used in friction units for friction pairs steel-bronze, steel-copper alloy. However, their lubricating properties are insufficient for a steel-steel friction pair.

Known low-temperature lubricating compositions based on liquid polyethylsiloxanes containing polyethylsiloxanes with a molecular weight of 500-1000 g / mol and a viscosity of 40-50 mm ² / s, polyalphaolefins with an average degree of oligomerization of 7-8 and a molecular weight of 900-1200 g / mol and dioctylsebacinate. The described compositions are characterized by good low-temperature properties (pour point below minus 80 ° C) and satisfactory lubricating properties, especially during rolling friction (the performance of the composition samples on a five-ball friction machine at room temperature and a load of 98 N was 250 ÷ 340 min.). (RF patent No. 2194741, IPC С10М 107/50, С10М 161/00, 2001).

The disadvantages of these compositions include low lubricity when sliding in the steel-steel friction unit (the diameter of the wear spot on a four-ball friction machine with a test duration of 60 minutes and a load of 196 N reaches 0.85 mm).

The closest in composition and purpose to the claimed object is a mixed silicone low-temperature oil, selected by us as a prototype, which is a mixture of polyethylsiloxane liquid PES-4 and mineral oils of the composition,% wt .:

Mineral oil selective cleaning MS-14 15-35 Polyethylsiloxane Liquid 65-85

(GOST 18375-73 with amendment 1-5, TU 6-02-897-78 with amendment 1-5; see appendix 1 and 2).

Despite the fact that until recently mixed oil (prototype) was widely used in various friction units, including steel-steel friction pairs, nevertheless, it does not meet modern requirements when operating machines and mechanisms with the most common steel friction pairs -steel due to low lubricating properties.

It should be noted that the production of the first component of the prototype, high-quality mineral oil, was discontinued due to the complete depletion of the resource of the unique Dossor oil field, which serves as the raw material for its production. The peculiarities of the hydrocarbon composition and physicochemical properties of this mineral oil do not allow its replacement with the use of bulk oil mixtures, including due to a sharp deterioration in low-temperature properties.

The objective of the present invention is the development of the composition of the oil providing stable operation and increased life of products and mechanisms in which there are steel-steel friction pairs.

As a result of scientific and experimental research, the problem is solved by creating a composition consisting of the following components,% wt.:

Oligomethyloctyl or oligoethyl octyl siloxane 40-80 Mineral oil and / or dos 20-60

This composition has the best lubricating properties for a steel-steel friction pair, and its lubricating properties significantly exceed these properties of each component separately (Table 3), which is the solution to the problem.

The oil preparation technology includes dosing the components in the above ratio and mixing them at ambient temperature for at least 30 minutes. followed by filtration.

Example 1 (prototype).

Oil Components: liquid polyethylsiloxane PES-4 (viscosity at 20 ° C - 42.0 mm ² / s) - 8.50 kg Oil MC-14 - 1.50 kg was charged to the mixer and mixed for 30 minutes after. whereupon the solution is filtered off (sample 1).

Example 2 (prototype).

Oil components: PES-4 polyethylsiloxane liquid (viscosity at 20 ° С - 42.0 mm ² / s) - 7.50 kg, MS-14 oil - 2.50 kg is loaded into the mixer and mixed for 30 minutes, after whereupon the solution is filtered off (sample 2).

Example 3 (prototype).

Oil components: PES-4 polyethylsiloxane liquid (viscosity at 20 ° С - 42.0 mm ² / s) - 6.50 kg, MS-14 oil - 3.50 kg is loaded into the mixer and mixed for 30 minutes, after whereupon the solution is filtered off (sample 3).

Example 4

Oil components: oligomethyloctylsiloxane liquid (viscosity at 20 ° C - 116 mm ² / s) - 7.00 kg, industrial oil I-20A - 3.00 kg is loaded into the mixer and stirred for 30 minutes, after which the solution is filtered ( Sample 4).

Example 5

Oil components: oligomethyloctylsiloxane liquid (viscosity at 20 ° C - 116 mm ² / s) - 8.00 kg, DOS - 2.00 kg are loaded into the mixer and stirred for 30 minutes, after which the solution is filtered (Sample 5) .

Example 6

Oil components: oligomethyloctylsiloxane liquid (viscosity at 20 ° C - 178.5 mm ² / s) - 5.00 kg, industrial oil I-20A - 5.00 kg is loaded into the mixer and mixed for 30 minutes, after which the solution filtered off (sample 6).

Example 7

Oil components: oligomethyloctylsiloxane liquid (viscosity at 20 ° С - 178.5 mm ² / s) - 4.00 kg, industrial DOS oil - 6.00 kg is loaded into the mixer and stirred for 30 minutes, after which the solution is filtered ( Sample 7).

Example 8

Oil components: oligoethyl octyl siloxane liquid (viscosity at 20 ° C - 281.4 mm ² / s) - 7.00 kg, industrial oil I-20A - 3.00 kg is loaded into the mixer and mixed for 30 minutes, after which the solution filtered off (sample 8).

Example 9

Oil components: oligoethyl octylsiloxane liquid (viscosity at 20 ° C - 281.4 mm ² / s) - 6.00 kg, industrial oil I-20A - 4.00 kg is loaded into the mixer and mixed for 30 minutes, after which the solution filtered off (sample 9).

In accordance with the essence of the present invention and the described technology, samples of a mixed oil — a prototype (samples 1-3) and the inventive oils (samples 4–9) — were made, the formulation of which is given in table 1.

The results of the study of the physico-chemical properties of the prepared samples in comparison with the prototype samples are presented in table 2.

From the data shown in table 2, it is seen that the proposed composition of the lubricating oil significantly exceeds the prototype in lubricating properties.

Table 3 presents the lubricating properties of the claimed oils and starting components.

The technical result of the invention is to expand the temperature range of operation of the products minus 80 - plus 200 ° C, increase the reliability and durability of various components in which there are steel-steel friction pairs, significantly reduce wear, reduce repair and maintenance costs.

* - all determinations were carried out according to standard methods.

** - Four-ball friction machine, air, 20 ° C, 1450 rpm., 196 N, 60 min., Steel ШХ-15.

Claims (2)

Lubricating oil for the stable operation of products and mechanisms in which there are steel-steel friction pairs based on oligoorganosiloxanes, characterized in that it contains oligomethyloctyl- and oligoethylsiloxane liquids with a viscosity of 100 ÷ 300 mm ² / s at 20 ° C, petroleum oil with a viscosity of 6 ÷ 110 mm ² / s at 40 ° C and / or dicarboxylic acid ester (bis (2-ethylhexyl) sebacic acid ester - DOS) with the following content of components, wt%: Oligomethyloctyl or oligoethyl octyl siloxane 40-80 Mineral oil and / or dos 20-60.