RU2455346C2 - Anticorrosion additive for lubricating oil - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: anticorrosion additive is 1,3,5-tris(2-butoxyethyl)-1,3,5-triazinane. The anticorrosion additive is contained in concentration 0.01-0.1 wt % in terms of the lubricating oil.

EFFECT: improved anticorrosion properties with respect to copper without deterioration of antiscoring properties.

1 tbl, 5 ex

Description

The present invention relates to the field of new anti-corrosion additives for lubricating oils that do not cause corrosion of copper.

Known anti-corrosion additive based on 2,5-dimercapto-1,3,4-thiazole derivatives of hydrocarbon-substituted polysulfides, which is used in a composition with boron-containing lubricants to prevent corrosion of copper [US Pat. US No. 4412928, CL C10M 1/20, 1983].

Disadvantages of the known additive: for the production of the known additive, it is necessary to use hard-to-reach and expensive starting reagents, the process of obtaining the additive is multi-stage.

Known anti-corrosion additive dimercaptothiadiazole used in sulfur-containing compositions, additive concentrates and lubricating oils containing them [US Pat. US No. 4612129, CL C10M 135/18, 133/58, 1986].

The disadvantages of this additive include low solubility in mineral oils (less than 0.01 wt.%) And, as a result, insufficient corrosion protection of copper.

The closest in technical essence and the obtained results is an anti-corrosion additive [US Pat. USA No. 4519928, CL C10M 1/32, 1985], which is a mixture of N-tert-alkylbenzotriazoles of the general formulas (1) and (2). It is introduced in an amount of 1% in the composition of lubricants to give them antioxidant and anti-corrosion properties.

where R = H, C ₁ -C ₁₂ ; R ₁ , R ₂ = C ₁ -C ₄ , R ₃ = C ₁ -C ₁₂ .

The disadvantages of this additive include:

1. Multi-stage production of additives and low selectivity for the target product.

2. Insufficient anticorrosive effectiveness, in connection with which it is introduced into lubricating compositions in significant quantities up to 1%. Given the high cost of this additive, its use leads to a significant increase in the cost of lubricant.

The authors have developed a new anti-corrosion additive for lubricants that does not cause copper corrosion.

The result is achieved by the fact that as an anti-corrosion additive to lubricants, 1,3,5-tris (2-butoxyethyl) -1,3,5-triazinine of the formula (3) is proposed:

The additive is obtained by condensation of monoethanolamine (H ₂ NCH ₂ CH ₂ OH) with formaldehyde (CH ₂ O) at a temperature of 40-60 ° C, preferably 50 ° C, for 4 hours, followed by the addition of a zinc oxide catalyst (ZnO) and at a temperature of 124 ° C for 1 h of n-butanol (C ₄ H ₉ OH) taken in a molar ratio of H ₂ NCH ₂ CH ₂ OH: CH ₂ O: ZnO: C ₄ H ₉ OH = 1: 1: (0.015-0.025) : 1, preferably 1: 1: 0.020: 1. The reaction mass is maintained at a temperature of 124 ° C and vigorous stirring for 5-7 hours. Receive the target product 1,3,5-tris (2-butoxyethyl) -1,3,5-triazinine of the formula (3) with the release of 92-99 % according to the scheme:

The additive is a light yellow oil. Found,%: C 66.09; H 10.64; N, 9.93; O 13.34. C ₂₁ H ₄₅ N ₃ O ₃ . Calculated,%: C 65.12; H 11.63; N, 10.85; About 12.40.

The subject of the tests was technological lubricants, in which sulfidated α-olefins of the C ₁₆ -C ₂₀ fraction causing corrosion of copper were used as "effective extreme pressure additives. To prevent the latter, 0.01 to 0.1 wt.% 1,3,5-tris were added to them (2-butoxyethyl) -1,3,5-triazinan.

The method is illustrated by the following examples.

Example 1. To the extract of selective purification of residual oils was added 7% sulfidated oligomers of α-olefins of fraction C ₁₆ -C ₂₀ with a sulfur content of 30.1 wt.% And 0.01 wt.% 1,3,5-tris (2-butoxyethyl) -1, 3,5-triazinan. The mixture was stirred at a temperature of 55-60 ° C for 1 h, cooled and tested according to GOST 2917-76 for corrosive effects on metal-copper. The extreme pressure properties of the oil were determined on a four-ball friction machine according to the method of GOST 9490-60 on balls made of ShKh-15 steel.

Example 2 is carried out analogously to example 1, but the amount of anti-corrosion additives is 0.030 wt.% For residual oil.

Example 3 is carried out analogously to example 1, but the amount of anti-corrosion additives is 0.050 wt.% For residual oil.

Example 4 is carried out analogously to example 1, but the amount of anti-corrosion additives is 0.100 wt.% Per residual oil.

Example 5 is carried out analogously to example 1, but without 1,3,5-tris (2-butoxyethyl) -1,3,5-triazinan.

The conditions and results of the experiments are presented in the table.

Analysis of the experimental data presented in the table shows that the introduction of an anticorrosive additive to a sulfur-containing composition of less than 0.01 wt.% Leads to corrosion of copper, and an increase in its concentration of more than 0.1 wt.% Is not economically feasible.

Thus, the proposed anti-corrosion additive for lubricating compositions has the following advantages compared to the prototype:

1. High anticorrosive activity, which allows ~ 15 times to reduce its content in oil.

2. Availability of starting reagents: monoethanolamine, formaldehyde, butanol.

3. Almost non-waste technology for producing 1,3,5-tris (2-butoxyethyl) -1,3,5-triazinan.

4. The use of anti-corrosion additives for lubricants does not impair their extreme pressure properties.

Claims (1)

Anticorrosive additive for lubricating oils based on 1,3,5-triazinan, characterized in that 1,3,5-tris (2-butoxyethyl) -1,3,5-triazinan is used in an amount of 0.01-0.1 weight .% for lubricating oil.