RU2233313C1 - Lubricant grease for heavily loaded unit friction rolling - Google Patents

Abstract

FIELD: lubricants.

SUBSTANCE: invention relates to the development of lubricant greases with working capacity in units friction rolling in the broad range of loadings and rates, in the range of temperature from -60 to +200 C. Lubricant comprises the following components, wt.-%: complex calcium soap of stearic and acetic acids, 10-20; small-dispersed graphite, 5-20; phenyl-α-naphthylamine, 0.3-1.0; ionol, 0.3-1.0; poly-alpha-olefinic oil with viscosity value 18-22 Sst at 100 C, 20-50; pentaerythritol alcohol and fatty acids of (C₅-C₉)-fraction ester, the rest. Invention provides enhancing working capacity in rolling bearing with slip members in the broad range of temperatures.

EFFECT: improved, enhanced and valuable properties of lubricant.

2 tbl

Description

The invention relates to the field of creating greases capable of rolling friction in a wide range of loads and speeds, in the temperature range from minus 60 to plus 200 ° C.

Known grease used in friction units of machines and mechanisms at high loads and speeds. The lubricant contains, wt.%:

12-hydroxy stearic acid lithium soap 3-5

polyethylene with mol. m. 30000-50000 0.5-1.5

polyisobutylene with mol. m. 10000-20000 4-8

zinc dialkyldithiophosphate 3-5

alkyl polysulfide 1-3

multisol calcium alkyl salicylate 0.5-1.5

alkylphenolamine resin 0.1-0.3

N-phenyl-b-naphthylamine 0.1-1.0

polymethylsiloxane liquid 0.005-0.03

distillate extract

isopropyl alcohol from solution,

extracted after biomass extraction

bacteria Rodococcus erithropolis 1-3

mineral oil up to 100

The grease is characterized by a rather narrow temperature range of application and a complex composition, which determines the low reproducibility of the grease from batch to batch (US Pat. RF No. 2048506, class C 10 M 169/04, 20.11.95).

Known grease for heavily loaded friction, containing, wt.%:

graphite 3-10

ceresin 0.5-1.0

product based on nitrated oil 1-3

calcium or lithium salt of the highest

fatty acid 8-12

kinematic viscosity oil

at minus 30 ° С not higher than 3000 Pa the rest

(Pat. RF No. 2000316, class C 10 M 169/04, 05/12/92).

The specified lubricating composition is characterized by poor performance in heavily loaded friction and rolling units with slippage and poor performance at high temperatures (up to 150 ° C).

Closest to the claimed composition is a grease containing, wt.%:

alkylnaphthalene oil 1-40

complex calcium

soap of stearic and acetic acids 15-25

copper phthalocyanine 3-10

phenyl-α-naphthylamine 0.3-1.0

ionol 0.3-1.0

graphite 0.5-10.0

pentaerythritol alcohol

and fatty acids C ₅ -C ₉ 25-72

The disadvantages of this lubricant are insufficient performance at low temperatures (the lower temperature limit of use is minus 55 ° C), the strong coloring ability of the lubricant due to the content of copper phthalocyanine, which complicates the technical maintenance work with friction units, and a high level of viscosity at low temperatures (av. St. USSR No. 488844, 16.01.76).

The objective of the invention is to provide a grease for heavily loaded rolling friction units, which has improved performance in rolling bearings with slipping elements in a wide temperature range.

The problem is achieved by the proposed grease composition for heavily loaded rolling friction units based on a mixture of synthetic hydrocarbon oil and pentaerythritol ester and synthetic fatty acids of the C ₅ -C ₉ fraction, thickened with complex calcium soap of stearic and acetic acids, containing finely dispersed graphite, phenyl-α naphthylamine, ionol.

The lubricant is characterized in that as a synthetic hydrocarbon oil contains polyalphaolefin oil with a viscosity of 18-22 cSt at 100 ° C in the following ratio, wt.%:

complex calcium soap

stearic and acetic acids 10-20

fine graphite 5-20

phenyl α-naphthylamine 0.3-1.0

ionol 0.3-1.0

polyalphaolefin oil

with a viscosity of 18-22 CST at 100 ° C 20-50

pentaerythritol alcohol ester

and fatty acids fraction C ₅ -C _{9 the} rest

The claimed grease, in contrast to the prototype, contains a high content of fine graphite, which improves its antifriction properties. During flight operational tests of the claimed lubricant in real roller bearings of the landing gear wheels of Tu-154, Tu-134, Il-76, Su-27 and other aircraft, it was found that the lubricant is operable at a temperature of minus 60 ° C and lower.

To obtain the lubricant use: calcium soap of stearic acid according to STP-0199-50-401-055-91, rev. 1; calcium acetate in accordance with GOST 3159-76, rev. 1-2; dry colloidal graphite preparation brand S-1 according to TU 113-08-48-64-90, rev. 1; additive Agidol-1 (ionol) according to TU 38.5901-237-90, rev. 1-2; Neozone A (phenyl-α-naphthiamine) according to TU-6-14-20-202-74, amend. 1-5; pentaerythritol alcohol and synthetic fatty acid esters of the C ₅ -C ₉ fraction (ester No. 2) according to TU 38.101-272-72, amend. 1-4; synthetic polyalphaolefin oil PAOM-20 according to TU 38.401-58-42-92, amendment 1-2.

The proposed lubricant is prepared as follows. The pentaerythritol alcohol and synthetic fatty acids of the C ₅ -C ₉ fraction are mixed with synthetic polyalphaolefin oil for 15 minutes. Then, in small portions, the calculated amounts of calcium soap of stearic acid and calcium salt of acetic acid are loaded and mixed until a homogeneous suspension is formed, after which the mixture is heated to a temperature of 92-100 ° C. Then the temperature is increased to 240-250 ° C, at which this mixture is maintained. Antioxidant additives can be added to the grease both during cooking and in the cooled grease.

The cooled lubricant is treated on a homogenizer. Before machining, the estimated amount of graphite is introduced into the lubricant.

According to the above technology, six samples of lubricants were prepared, covering the entire spectrum of the claimed concentrations (table 1).

The following properties of the manufactured lubricants were studied (see table 1):

1. Effective viscosity according to GOST 7163 at minus 40 ° C and D = 10 s ^-1 ;

2. Colloidal stability according to GOST 7142;

3. Lubricating properties at ChShM in accordance with GOST 9490;

4. Tribochemical stability on PMT according to OST 38.01416;

5. Efficiency in rolling bearings at high load on the stand of TsKB - 60 at 200 ° C and a load of 300 kg (in hours) (Decision of the State Interdepartmental Commission under the State Standard of the Russian Federation of 05.24.78 No. 23/4-83).

The data in Table 2 show that the proposed composition of grease at the stated ratio of components exceeds the prototype in all tested parameters, namely in the temperature range of application, in tribostability, in lubricating characteristics, and most importantly, in working capacity in the rolling friction zone with slippage.

Claims (1)

Grease for heavily loaded rolling friction units based on a mixture of synthetic hydrocarbon oil and pentaerythritol alcohol and synthetic fatty acids of the C ₅ -C ₉ fraction, thickened with complex calcium soap of stearic and acetic acids, containing finely divided graphite, phenyl-α-naphthylamine, ionol, characterized in that as a synthetic hydrocarbon oil, the lubricant contains polyalphaolefin oil with a viscosity of 18-22 cSt at 100 ° C, in the following ratio, wt.%: Complex Calcium Soap stearic and acetic acids 10-20 Fine graphite 5-20 Phenyl α-naphthylamine 0.3-1.0 Ionol 0.3-1.0 Polyalphaolefin oil with viscosity 18-22 cSt at 100 ° С 20-50 Pentaerythritol ester alcohol and fatty acids fractions C ₅ -C ₉ The rest