RU2224009C1 - Protective lubricant - Google Patents

Abstract

FIELD: lubricants. SUBSTANCE: lubricating material for protection of hard-to- reach metal surfaces contains, wt %: alkali metal sulfonate 2-6, complex calcium salt of oxidized ceresin 8-14, solid oilorigin hydrocarbons 18-25, oxidized atactic polypropylene 0.5-2.0, reaction product of aminoalcohol with fatty carboxylic acid fraction C₁₄-C₂₂ 2-4, and balancing amount of organic solvent. EFFECT: improved adhesive and protective properties of material and reduced production expenses. 2 tbl

Description

 The invention relates to protective lubricants, which are film-forming inhibited oil compositions intended for corrosion protection of hard-to-reach metal surfaces, for preserving hidden body cavities in a passenger car manufacturing process.

 Known protective lubricant containing alkaline earth metal sulfonate, lithium stearate, solid petroleum hydrocarbons, dialkylphosphoric acid, polyethylene, zeroxone amide and an organic solvent (patent RU 2129144, C 10 M 167/00. Bull. 11, 1999).

 However, the used lithium stearate, polyethylene and dialkylphosphoric acid in the known lubricant are expensive products that complicate and costly the manufacturing process of the material.

 The problem solved by the invention is to reduce production costs and increase the protective properties of the material in aggressive environments.

 The technical result that can be obtained by implementing the claimed invention is to increase the adhesive and protective properties of the material and reduce material costs for its production through the use of cheap components: complex calcium salt of oxidized ceresin, oxidized atactic polypropylene, amide of fatty acids and lowering the temperature of the process .

The task with the indicated technical result is achieved by the fact that the known protective lubricant contains alkaline earth metal sulfonate, a soap thickener, solid petroleum hydrocarbons, a plasticizer, an acceptor corrosion inhibitor and an organic solvent, according to the invention, a complex calcium salt of ceresin oxidation products is used as a soap thickener, as a plasticizer - oxidized atactic polypropylene, as a corrosion inhibitor of acceptor de action - the product of the reaction of amino alcohol with fatty carboxylic acids of the fraction C ₁₄ -C ₂₂ in the following ratio of components, wt.%:
Alkaline earth metal sulfonate - 2.0-6.0
Complex calcium salt of oxidized ceresin - 8-14
Solid Petroleum Hydrocarbons - 18-25
Oxidized Atactic Polypropylene - 0.5-2.0
The reaction product of an amino alcohol with fatty carboxylic acids of the fraction C ₁₄ -C ₂₂ - 2-4
Organic Solvent - Else
In the claimed composition, the complex calcium salt of oxidized ceresin performs simultaneously the function of a soap thickener and a protective additive that increases the adhesive properties and the dropping point (melting) of the dry residue (active part) of the composition.

Increasing the adhesion properties and dropping point of the dry matter of the composition contribute to the formation of a protective film on the surface of the processed metal, not flowing down from vertical surfaces at 160-170 ^o C.

The complex calcium salt of oxidized ceresin is synthesized by oxidation of petroleum ceresin with atmospheric oxygen in the presence of a catalyst to an acid number of 50-70 mg KOH / g and a saponification number of 100-140 mg KOH / g. Then, the product obtained in the environment of calcium sulfonate and molten petroleum hydrocarbon is saponified with an aqueous suspension of calcium hydroxide. A complexing agent is added to increase the thickening ability of the salt. As a complexing agent, stearin or acetic acid is used. The ratio between the oxidized oil ceresin and the complexing agent is maintained at a level of from 6: 1 to 12: 1. The saponification process is carried out until the free alkali content in the soap is 0.1-0.4 wt. % NaOH, and then dehydrated at 140 ^o C. The resulting dry substance has a dropping point (melting) not lower than 160 ^o C.

 The polyethylene used in the known composition is a weak adhesive additive and a weak plasticizer compared to the oxidized atactic polypropylene in the claimed composition. In addition, oxidized atactic polypropylene additionally increases the protective properties and reduces the cost of the composition.

Oxidized atactic polypropylene is obtained by oxidizing atactic polypropylene with a molecular weight of 36000-40000 with atmospheric oxygen (0.5 dm ³ / min / kg) at a temperature of 150-200 ^o C (USSR Author Certificate 1070138, C 08 F 8/50, 1982).

Oxidized atactic polypropylene has the characteristic:
Dynamic viscosity at 100 ^o C, Pa • s - 50-70
Softening point, ^o С - 98-100
Molecular Weight - 22000-30000
As a corrosion inhibitor of acceptor action, the reaction product of an amino alcohol with fatty carboxylic acids of the C ₁₄ -C ₂₂ fraction is used. As fatty acids, acids C ₁₄ -C _{22 of} synthetic, plant or animal origin are used. As the amino alcohol, for example, diethanolamine, methyldiethanolamine and triethanolamine are used. The reaction of amino alcohol with fatty carboxylic acids is carried out at 135-160 ^o C.

 The reaction product has the characteristic: acid number 2-15 mg KOH / g

 Alkaline earth metal sulfonates, for example, petroleum calcium sulfonates: C-150 or KND additives, are used as an oil-soluble donor corrosion inhibitor in a protective lubricant. As solid petroleum hydrocarbons use: VN-2 wax according to TU 38-401-210-93, high-melting petroleum residue or petrolatum.

As an organic solvent, for example, white spirit according to GOST 3134-78 or Nefras C4 with a boiling range from 140 to 200 ^o C. is used.

The method of obtaining the proposed protective material consists of the following stages:
A. Saponification of oxidized ceresin with an aqueous suspension of calcium hydroxide in a medium of molten solid petroleum hydrocarbons and petroleum calcium sulfonates with constant stirring and with the addition of a complexing agent, acetic acid or stearin.

B. The introduction of oxidized atactic polypropylene and fatty acid amide at a temperature of not lower than 110 ^o C and constant mechanical stirring until completely dissolved.

 B. Introduction to the mixture of an organic solvent with constant mechanical stirring.

 D. Product cooling.

 D. Homogenization.

 The specified method is prepared are presented in table 1 samples of protective lubricants.

 The prepared samples evaluate the physicochemical properties. The results are presented in table 2.

 As can be seen from table 2, for the compositions of the proposed composition, the level of protective properties in the salt fog environment is significantly higher than that of the known composition.

 A decrease in the concentration of components below the limiting leads to a decrease in the dropping temperature of the composition, protective efficiency, and colloidal stability.

 An increase in the concentration of components above the limit leads to a sharp thickening of the material and a decrease in its colloidal stability.

Claims (1)

A protective lubricant containing alkaline earth metal sulfonate, a soap thickener, solid petroleum hydrocarbons, a plasticizer, an acceptor corrosion inhibitor and an organic solvent, characterized in that a complex calcium salt of oxidized ceresin is used as a soap thickener, oxidized atactic polypropylene is used as a plasticizer, and as a corrosion inhibitor of the acceptor action, the product of the reaction of amino alcohol with fatty carboxylic acids fr shares C ₁₄ -C ₂₂ in the following ratio of components, wt.%: Alkaline earth metal sulfonate 2.0-6.0 Complex calcium salt of oxidized ceresin 8-14 Solid Petroleum Hydrocarbons 18-25 Oxidized Atactic Polypropylene 0.5-2.0 The reaction product of the amino alcohol with fatty carboxylic acids of the fraction C ₁₄ -C ₂₂ 2-4 Organic solvent Remaining up to 100

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