RU2391385C1 - Composition for making lubricant - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry, particularly to compositions for making penetrating lubricants with defrosting effect, which can be used on metal sliding surfaces, e.g. latch mechanisms, wind-screen wipers and similar friction assemblies used at low temperatures. The composition contains the following in wt %: ester based on mixture of isomers of bis(2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid 5-30, corrosion inhibitor soluble in polar oganic solvents 0.01-0.1, water-soluble corrosion inhibitor 0.01-0.1, solvent - the rest. Preferably, the polar solvent used is methanol or ethanol or isopropanol or butyl cellosolve. The non-polar solvent with C₅-C₁₅ carbon atoms is kerosene.

EFFECT: effective lubricating capacity, higher penetrating power during defrosting, prolonged defrosting effect, high protective effect.

10 cl, 2 tbl, 6 ex

Description

The invention relates to the chemical industry, in particular to compositions for the manufacture of penetrating lubricants with a defrosting effect, which can be used for metal friction surfaces, such as locking mechanisms, vehicle wipers and similar friction units operating at low temperatures.

Various formulations are known in science and technology that can be used to lubricate mechanisms operating at low temperatures. So, for example, a composition is known containing, wt.%: Monohydroxy aliphatic alcohol or a mixture of 70-85; aldehyde 3-6; ether 3-6; potassium salt of an organic acid With ₂ -C ₆ or a mixture of 0.1-0.3; non-drying vegetable oil 1-10; water - the rest, additionally contains dye-eosin 0.0006 wt.%, it contains alkyl acetate as ether and castor, coriander and peach oils as non-drying vegetable oil. [Patent RU No. 2052484 MPK6 S09K 3/18, 1996].

The known composition is intended for the treatment of door locks or mechanisms of glass washers of vehicles operating at low temperatures, and provides good defrosting and corrosion-protective properties. However, the known composition does not provide a complex effect, because does not have the necessary lubricity.

The closest in technical essence to the claimed technical solution is a lubricating composition with penetration during defrosting and prolonged action of the defrosting effect, containing liquid copolymers - 0.5-3.5 wt.%; corrosion inhibitor - 0.01-0.1 wt.%; polytetrafluoroethylene - 0.5-3.5 wt.%; nonionic surfactant - 0.001-0.015 wt.%; alkali metal hydroxide - 0.006-0.04 wt.%; alcohol or a mixture of alcohols - the rest. [Patent RU No. 23232149, IPC S09K 3/18, 2008].

In the known composition, liquid copolymers (C ₁₄ -C ₁₆ ) of alpha-olefins and alpha, beta unsaturated 1,4-dicarboxylic acid esterified with short- or medium-chain alcohols and having a molecular weight of from 600 to 7000 and polytetrafluoroethylene powder are used as a lubricating component, having a particle size dispersion of 1 · 10 ⁴ -5 · 10 ⁴ Å; as a corrosion inhibitor soluble in polar solvents, the compounds of formula (I) or formula (II) are used:

where RH; RC ₂ H ₃ (COOH) ₂ ; RC ₃ H ₅ (COOH) ₂

where R _{1 is} -COH; R ₂ -Na; H

The composition also contains a nonionic surfactant, alkali metal hydroxide and alcohol or a mixture of alcohols.

Significant disadvantages of the known composition are:

The insufficient lubricity of the liquid lubricant component necessitated the introduction of polytetrafluoroethylene with a particle size of 1-5 μm into the known composition. However, this additive, due to the phenomenon of sedimentation, reduces the penetrating ability of the known composition and requires its vigorous agitation before use, since polytetrafluoroethylene particles tend to agglomerate. In addition, the disadvantages include low durability of the composition due to the phenomenon of sedimentation, low adhesive strength on hard surfaces, insufficiently low pour point of a liquid lubricating component of known composition: KL-135 Akzo Nobel (US) under the trademark Ketjenlube 135 - minus 32 ° FROM.

The objective of the invention is the creation of a penetrating lubricant with improved lubricity while achieving a prolonged defrosting effect.

To solve the technical problem, a composition is proposed containing an ester based on a mixture of isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid, a corrosion inhibitor soluble in polar solvents, a water-soluble corrosion inhibitor and a solvent in the following ratio, wt.%:

Esters Blend Esters bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid 5.0-30.0 Soluble in polar organic solvent corrosion inhibitor 0.01-0.1 Water soluble corrosion inhibitor 0.01-0.1 Solvent rest

For the preparation of the proposed composition, a ready-to-use ester based on a mixture of isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid is used which is commercially available according to TU 2389-067-00209409-2008, which has the following formula:

The specified product belongs to the class of fluorine-containing polyesters, has a density at 20 ° С - 1,200 g / cm ³ , kinematic viscosity at a temperature of 20 ° С (mm ² / s) - 17-20, pour point of bis (2-ethylhexyl ether) isomers perfluorocyclohexanedicarboxylic acid - minus 50-55 ° C.

The addition of fluorinated polyester — isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid — to the composition of the composition increases the wettability of the friction surfaces by reducing the surface tension of the lubricating composition.

Preferably, 2-mercaptobenzothiazole C ₇ H ₅ NS ₂ or benzotriazole are used as soluble corrosion inhibitors in polar solvents.

As a water-soluble corrosion inhibitor, any compounds known for these purposes are used, for example triethanolamine (TEA) according to TU 6-09-14-553-78.

As the solvent, a polar low molecular weight alcohol selected from the group of methanol, ethanol, isopropanol, butyl cellosolve and other similar compounds and / or a non-polar solvent selected from the class of hydrocarbons, preferably with a number of carbon atoms of C ₅ -C ₁₅ , for example kerosene and other similar compounds.

In the case of a decrease in the declared content of the lubricating component in the proposed composition in the form of isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid and corrosion inhibitors, the operational reliability of the composition in terms of the effectiveness of protecting metal surfaces from repeated freezing decreases, especially when used on rubbing metal surfaces, and also deteriorate corrosion -protective properties of the composition.

In the case of an increase in the declared content of components in the proposed composition increases the costly part of its preparation.

The effectiveness of prolonged defrosting when using the inventive composition can be explained by an increase in the protection time from repeated freezing of the treated surfaces due to:

- the effective lubricity of the perfluorocyclohexanedicarboxylic acid bis (2-ethylhexyl ether) isomers used in the composition of isomers to metals and their oxides;

- reducing friction of friction surfaces during thawing due to the presence of perfluorocyclohexanedicarboxylic acid bis (2-ethylhexyl ether) in the composition of the isomers, which increases the adhesive stability of the resulting oil film on defrosted surfaces;

- improving the penetrating ability of the composition during thawing to the treated surfaces due to the presence in the composition of the isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid related to nonionic surfactants.

The presence in the claimed composition of a corrosion inhibitor in the form of 2-mercaptobenzothiazole or benzotriazole increases the effectiveness of the corrosion-protective properties of the composition at their low cost, and the presence of triethanolamine intensifies the defrosting process and improves the properties of the alcohol solution of the composition with an increase in the anticorrosive effect.

In the analysis of the prior art, no technical solutions with a combination of features corresponding to the claimed technical solution have been identified.

The above analysis of the prior art indicates that the claimed technical solution meets the criteria of "novelty."

The claimed combination of features of a technical solution implements the above comprehensive result, including the simultaneous achievement of a lubricating effect, a prolonged defrosting effect on metal surfaces and corrosion-protective properties. Despite the fact that it was previously known that the anti-wear and antifriction properties of fluorinated ethers are better than non-fluorinated ones (Klamann D. Lubricants and related products. M: Chemistry, 1988), the complex result achieved by the claimed technical solution obviously does not follow from the properties the fluorine-containing esters indicated by us known in the art. The above allows us to conclude that the claimed technical solution meets the criterion of "inventive step".

The claimed technical solution can be made from known components and industrially implemented as a ready-to-use product for the specified purpose. This allows us to conclude that it meets the criterion of "industrial applicability".

The preparation of the claimed composition is carried out by mixing the components in a calibrated metal reactor equipped with a low-speed stirrer and water heating. The process of mixing the components is carried out at a temperature of 20-30 ° C for 20-40 minutes. The components of the composition are introduced in the claimed amounts, wt.%:

Esters Blend Esters bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid 5.0-30.0 Soluble in polar organic solvent corrosion inhibitor 0.01-0.1 Water-soluble corrosion inhibitor 0.01-0.1 Solvent rest

Examples of specific performance.

Examples No. 1 ÷ No. 5 (according to the invention)

In a calibrated metal reactor, a mixture of isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid) 2-mercaptobenzothiazole or benzotriazole, triethanolamine is prepared; as a solvent, kerosene and isopropanol or isopropanol or kerosene. The compositions according to the invention No. 1 ÷ No. 5 are presented in table No. 1. The compositions according to the invention are low toxic - refers to the IV class of toxicity according to GOST 12.1.007-76.

Example No. 6 (prototype)

Liquid copolymers (KL-135) - 2.0 wt.%; 2-mercaptobenzothiazole (C ₇ H ₅ NS ₂ ) - 0.05 wt.%, Polytetrafluoroethylene with a particle size of 5 · 10 ⁴ Å - 2.0 wt.%; fluorliphatic ether - 0.001 wt.%, sodium hydroxide - 0.01 wt.%; isopropanol - the rest.

When conducting comparative tests of the claimed composition and composition of the prototype, their operational reliability was evaluated taking into account the effectiveness of defrosting metal surfaces and protecting them from repeated freezing. Evaluation of the compositions was carried out according to the following procedure.

Metal plates with drilled holes were fixed in tripods. Metal cylinders (load of a given mass) and with a diameter exceeding the diameter of their holes were frozen to the plates in the area of the holes. The freezing process was carried out in a cryochamber at a temperature of minus 15-20 ° C for 30-40 minutes using water to wet the plates and cylinders. Then, defrosting compositions according to examples 1-6 were poured into the plate openings (without removing the tripods from the cryocamera). By the time of cargo retention on the plates, the effectiveness of the compositions was evaluated by defrosting ability. Then weights were re-frozen to metal plates and the protective efficacy of the compounds during the thawing of metal surfaces was evaluated.

Tests of the compositions according to examples No. 1 ÷ No. 6 showed the following results.

Breakaway time of frozen cargo from metal platinum: examples No. 1 ÷ No. 5 (according to the invention) - 15 sec; Example No. 6 (according to the prototype) - 15 sec.

The time of repeated freezing of the cargo to the metal plate: examples No. 1 ÷ No. 5 (according to the invention) - 1 hour; example No. 6 (prototype) - 1 hour.

The lubricity of the claimed composition and composition of the prototype was evaluated in the following way.

The compositions prepared according to examples No. 1 ÷ No. 6 were subjected to tests on a SMT-1 friction machine according to the Ring-Ring scheme with ШХ-15 rings: hardened HRc 52 with flat rubbing surfaces treated according to grade 8 of purity (R _a = 0.38 ) The outer diameter of the tribo _nap D = 0.076 m Inner diameter D _ext tribomating = 0.070 m The number of revolutions of the shaft -.. 500, 1000 and 1500 rev / min. The rings were pressed to each other by a spring force of 300 H and the friction moment was measured at all speeds, on the basis of which the coefficient of friction was calculated by known formulas. The data are shown in table No. 2.

As can be seen from the data in table 2, the claimed composition exceeds the known composition in terms of friction coefficient by about 1.5-2.0 times, which, in turn, leads to an improvement in the extreme pressure and antiwear properties of friction units.

Thus, the tests indicate that the inventive composition has a high penetrating ability when defrosting to the treated surfaces, is more effective in terms of lubricity due to improved friction coefficient, and also increases the protective effect when defrosting surfaces.

TABLE 1 Defrosting grease formulations Component Name Examples of the invention, wt.% An example of the prototype, wt.% one 2 3 four 5 6 A mixture of isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid 5,0 10.0 17.0 25.0 30,0 - 2-mercaptobenzothiazole 0.1 0.05 - - 0.01 0.05 Benzotriazole - - 0.01 0.05 - - Triethanolamine 0.01 0.01 0.1 0.05 0.1 - A mixture of kerosene and isopropanol (kerosene - 5 wt.%) - 89.94 - 74.90 69.89 - Isopropanol 94.89 - - - - 95,939 Kerosene - - 82.89 - - Liquid copolymers (KL-135) - - - - - 2.0 Polytetrafluoroethylene with a particle dispersion of 5 · 10 ⁴ Å - - - - - 2.0 Fluorliphatic ether - - - - - 0.001 Caustic soda - - - - - 0.01

TABLE 2 Lubricant Test Results Quality indicators EXAMPLES Coefficient of friction one 2 3 four 5 6 at 500 rpm 0,063 0,061 0,060 0,060 0,060 0,099 at 1000 rpm 0,040 0,039 0,039 0,038 0,037 0,064 at 1500 rpm 0,027 0,026 0,026 0,025 0,025 0.051

Claims (10)

1. A composition for the manufacture of a lubricant containing a lubricating component, a corrosion inhibitor soluble in polar organic solvents, a water-soluble corrosion inhibitor and a solvent, characterized in that the lubricant component contains an ester based on a mixture of isomers of bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid when the following ratio of components, wt.%:
ester mixture based on a mixture of isomers bis (2-ethylhexyl ether) perfluorocyclohexanedicarboxylic acid 5.0-30.0 soluble in polar organic solvent corrosion inhibitor 0.01-0.1 water soluble corrosion inhibitor 0.01-0.1 solvent rest 2. The composition according to claim 1, characterized in that it contains benzotriazole as soluble in polar organic solvents. 3. The composition according to claim 1, characterized in that it contains 2-mercaptobenzothiazole as a corrosion inhibitor soluble in polar organic solvents. 4. The composition according to claim 1, characterized in that as a water-soluble corrosion inhibitor contains triethanolamine. 5. The composition according to claim 1, characterized in that the solvent contains polar low molecular weight alcohol. 6. The composition according to claim 5, characterized in that the polar solvent contains methanol, or ethanol, or isopropanol, or butyl cellosolve. 7. The composition according to claim 1, characterized in that the solvent contains a non-polar solvent with the number of carbon atoms C ₅ -C ₁₅ . 8. The composition according to claim 7, characterized in that as a non-polar solvent with the number of carbon atoms, C ₅ -C ₁₅ contains kerosene. 9. The composition according to claim 1, characterized in that the solvent contains a mixture of non-polar and polar solvents. 10. The composition according to claim 9, characterized in that as a mixture of non-polar and polar solvents contains a mixture of kerosene and isopropanol.