RU2698457C1 - Multipurpose complex grease - Google Patents

Abstract

FIELD: chemistry.SUBSTANCE: invention relates to production of multi-purpose complex grease with wide range of operating temperatures for various friction assemblies of mobile equipment and stationary equipment. Grease contains, wt%: 12-oxystearic acid – 8.0–16.0; complexing agent – 1.5–8.0; lithium hydroxide – 1.0–5.0; polymer modifier – 0.3–5.0; antioxidant – 0.2–1.0; additive with anti-wear and / or anti-scoring properties – 0.0–6.0; corrosion inhibitor – 0.0–2.0; solid filler – 0.0–20.0; mineral or synthetic oil – up to 100.EFFECT: improved viscous-temperature characteristics of the base oil, high lubrication strength at high temperatures owing to formation of a supramolecular mesh structure, improved adhesion to metal surfaces owing to interaction of metals with a free double bond of the modifier.1 cl, 4 tbl

Description

The invention relates to the creation of a multi-purpose complex grease with a wide range of operating temperatures for various friction units of mobile equipment and stationary equipment.

Known grease (RU 1780316 C2) containing, by weight. %:

Complex lithium soap of 12-hydroxystearic acid or hydrogenated castor oil, tetraboric and terephthalic acids 15-22 Thiodiphenylamine 0.5-1.0 Polyalkenylsuccinimide 0.4-8.0 Zinc dialkyldithiophosphate 0.5-5.0 Petroleum oil up to 100

This grease is used for friction units of paper equipment. The technical result is to improve the performance of the lubricant at elevated temperatures, loads and humidity. The disadvantages of this composition are unsatisfactory low temperature properties and low extreme pressure characteristics.

Known grease (RU 2217483 C1) containing, by weight. %:

12-hydroxystearic acid lithium soap 11.5-15.5 Boric Acid Lithium Soap 1.1-1.4 Adipic Acid Lithium Soap 1.2-1.6 Phenyl-β-naphthylamine 0.8-1.2 Zinc dialkyldithiophosphate 2.0-4.0 Nitrated Oil Additive 0.5-1.5 Fat soluble dye 0,03 Butter up to 100

This grease is used in tapered roller bearings of axlebox units of cassette type of freight and passenger cars. The technical result is improved low temperature, antiwear and anti-corrosion properties. The disadvantages of this composition are low colloidal stability, low extreme pressure characteristics and poor adhesion to metals.

Known grease (RU 2483100 C1) containing, by weight. %:

12-hydroxystearic acid lithium soap 8.0-20.0 tri-2-ethylhexyl borate 2.0-3.2 metal dialkyldithiophosphate 0.5-2.0 base oil rest

The technical result is to provide a high dropping point. The disadvantages of this composition are low mechanical and colloidal stability, low tribological characteristics and poor adhesion to metals.

Closest to the proposed is a grease RU 2627766 C1, containing, by weight. %:

complex lithium soap 12-hydroxystearic acid 18-26 1,2,3 Benzotriazole 0.3-0.8 AKOR-1 0.4-0.8 isobutylene polymer 1.0-2.0 zinc dialkyldithiophosphate 0.3-0.7 HiTech 343, Anglamol-99 or Anglamol-33 1.5-2.5 Agidol-1 (4-methyl-2,6-di-tert-butylphenol), Naphtham-2 or diphenylamine 0.3-1.0 blue phthalocyanine pigment 0.7-1.2 a mixture of mineral base oils rest

This product can be used as a multi-purpose universal high-temperature lubricant intended for use in friction units of loaded industrial equipment, modern vehicles, industrial, construction and marine equipment operating at temperatures from minus 35 ° С to 160 ° С.

The disadvantages of this composition are the low tensile strength at elevated temperatures and low adhesion to metal surfaces.

An object of the present invention is to provide a multi-purpose high-temperature grease composition with an increased tensile strength at elevated temperatures and improved adhesion to metals.

The technical result of the invention is to increase the tensile strength at elevated temperatures and reduce the tendency to crawl from metal surfaces.

This problem is solved by grease containing a thickener based on a complex lithium soap of 12-hydroxystearic acid and a complexing agent, a polymer structure modifier, a complex of functional additives, fillers and colorants, mineral or synthetic base oils.

The grease composition is represented by the following ratio of components, wt. %:

12-hydroxystearic acid 8.0-16.0 complexing agent 1,5-8,0 lithium hydroxide 1.0-5.0 polymer modifier 0.3-5.0 antioxidant 0.2-1.0 antiwear additive and / or extreme pressure properties 0,0-6,0 corrosion inhibitor 0,0-2,0 solid filler 0,0-20,0 dye 0,0-1,0 mineral or synthetic oil up to 100.

A distinctive feature of the claimed composition is the joint use of a thickener based on a complex lithium soap of 12-hydroxystearic acid and a complexing agent, which ensures the lubricant's performance at temperatures up to 180 ° C, and a polymer structure modifier containing a free double bond and providing an improvement in the viscosity-temperature characteristics of the base oil and increasing ultimate strength of grease at elevated temperatures.

Also, the polymer modifier helps to improve the adhesive properties of the claimed composition due to the formation of a supramolecular mesh structure and the interaction of the metal surface with the free double bond of the polymer modifier.

The following components are used in the described lubricant:

- as a complexing agent, acids: sebacic, terephthalic, boric, benzoic, azelaic, adipic, or a mixture thereof in any ratio;

- as a polymer modifier: natural rubber and synthetic rubber from the following series: isoprene, butadiene, butadiene-styrene or their mixture in any ratio between themselves and polymers - derivatives of ethylene, propylene, isobutylene;

- as an antioxidant: diphenylamine, phenyl-α-naphthylamine, phenyl-β-naphthylamine, alkylated diphenylamine, alkylated phenyl-α-naphthylamine, alkylated phenyl-β-naphthylamine; 4-methyl-2,6-ditretbutylphenol, 2,2-methylene-bis (4-methyl-6-tert-butylphenol), 4,4-methylene-bis (2,6-ditretbutylphenol);

- as a base oil: mineral, hydrogenation process oils, synthetic (polyalphaolefin, ether-based, organosilicon), vegetable, or mixtures thereof in any ratio.

If necessary, the following lubricants may be added:

- as an additive with antiwear and / or extreme pressure properties (antiwear / extreme pressure additive) - phosphoric acid esters of various structures, sulfur-phosphorus-containing organic compounds, chlorine-containing organic compounds or their mixture in any proportions;

- as corrosion inhibitors - benzotriazole derivatives, derivatives of alkyl succinic acids, oxidized paraffins and ceresins, salts and esters of carboxylic and sulfonic acids, triethanolamine and its derivatives, derivatives of alkenylsuccinimides, derivatives of dimercaptothiadiazole;

- as solid fillers - graphite, carbon black, molybdenum or tungsten disulfides and dyslenides, silicon dioxide, fluoroplast (polytetrafluoroethylene), metal or oxide powders, mica, talc, boron nitrite, vermiculite and others;

- as a dye - pigments of various structures, soluble in a hydrocarbon medium.

The described lubricant is prepared as follows: in the apparatus with a mixing device equipped with a heating system, the calculated amount of base oil and polymer modifier is loaded, heated with constant stirring to a temperature of 95-105 ° C, the components of the complex soap thickener are loaded and the saponification reaction is carried out. Then the reaction mixture is heated to a temperature of 125-130 ° C to remove moisture, after which the soap and oil concentrate is subjected to thermomechanical dispersion with constant stirring and raising the temperature to 200-240 ° C.

Next, the product is cooled to a temperature of 60-100 ° C and the resulting lubricant is drained into a container with preliminary homogenization.

Before the homogenization step, calculated amounts of additives, fillers and colorants can be added to the chilled lubricant, if necessary.

According to the above technology, 31 samples of lubricants were prepared, covering the entire spectrum of the claimed concentrations:

- 15 samples of a multi-purpose complex lithium grease for heavily loaded friction units operating in the temperature range from minus 40 to 160 ° C;

- 15 samples of synthetic multi-purpose complex lithium grease for heavily loaded friction units operating in the temperature range from minus 50 to 160 ° C;

- a prototype prepared by technology RU 2627766 C1.

The compositions of the prepared grease samples are presented in tables 1.1, 2.1, and the properties of these samples are shown in tables 1.2, 2.2.

From the above data it follows that the claimed grease has an increased tensile strength at elevated temperatures and improved adhesion to metal surfaces.

Claims (2)

A grease containing a thickener based on complex lithium soap of 12-hydroxystearic acid and a complexing agent, a polymer structure modifier, a complex of functional additives, fillers and dyes, mineral or synthetic base oil in the following ratio, wt.%: 12-hydroxystearic acid 8.0-16.0 complexing agent 1,5-8,0 lithium hydroxide 1.0-5.0 polymer modifier 0.3-5.0 antioxidant 0.2-1.0 antiwear additive and / or extreme pressure properties 0,0-6,0 corrosion inhibitor 0,0-2,0 solid filler 0,0-20,0 dye 0,0-1,0 mineral or synthetic oil up to 100