Gear lubricant composition

Abstract

The present application relates to a gear lubricant composition comprising: 97 to 99.9 wt.-% trimethylolpropane triester; and 0.1 to 3 wt.-% at least one additive selected from among anti-wear additives, extreme pressure additives, antioxidants, anti-corrosion additives, metal deactivator additives, antifoams, and mixtures thereof.

Claims

1. A method of lubricating gearing or equipment comprising gearing comprising lubricating the parts of said gearing or equipment comprising gearing by placing the parts in contact with a lubricant composition consisting essentially of: 97 to 99.9% by weight of a trimethylolpropane triester, wherein the trimethylolpropane triester is a branched C14-C20 saturated fatty acid ester; and 0.1 to 3% by weight of at least one additive selected from the group consisting of anti-wear additives, extreme pressure additives, antioxidants, anticorrosive additives, metal deactivator additives, defoamers, and mixtures thereof; wherein the trimethylolpropane triester is trimethylolpropane isostearate.

2. The method according to claim 1, wherein the composition comprises: 0.1 to 1% by weight of an anti-wear additive phosphate of amine; and 0.1 to 1% by weight of a phenolic antioxidant additive.

3. The method according to claim 2 wherein the amine phosphate is an amine alkyl phosphate.

4. The method according to claim 1, wherein the equipment comprising gearing is a stern tube.

5. A method of lubricating gearing or equipment comprising gearing comprising lubricating the parts of said gearing or equipment comprising gearing by placing the parts in contact with a lubricant composition comprising: 97 to 99.9% by weight of a trimethylolpropane isostearate; and 0.1 to 3% by weight of at least one additive selected from the group consisting of anti-wear additives, extreme pressure additives, antioxidants, anticorrosive additives, metal deactivator additives, defoamers, and mixtures thereof; wherein the lubricant composition does not contain any unbranched or unsaturated fatty acid esters.

Description

EXAMPLE 1: EXAMPLE OF COMPOSITION ACCORDING TO THE INVENTION

(1) Table 1 describes an example of composition according to the invention

(2) TABLE-US-00001 TABLE 1 Composition 1, % Components m/m content Trimethylolpropane iso- 98.52 stearate Phenolic antioxidant 0.5 Anti-wear amine 0.5 phosphate Anti-wear dialkyl 0.09 dithiophoshate type Anti-corrosion 0.1 Metal deactivator 0.09 Antifoam silicone stock 0.2 solution

EXAMPLE 2: TRIBOLOGICAL TRIALS

(3) The following tribological tests were carried out: FZG A/8.3/90° C. according to ISO 14635-1 (equivalent to CEC L-07-A-95) FZGA/8.3/60° C. according to the modified ISO 14635-1 standard FZG A10/16.6R/30 according to ISO 14635-2 (equivalent to CEC L-84) FZG A10/16.6R/90 according to ISO 14635-2 (equivalent to CEC L-84). Micropitting C-GF/8.3/90 according to FVA 54/I-IV FAG-FE8 D7,5/80-80 according to DIN51819-3 FAG-FE8 D7,5/100-80 according to DIN51819-3

(4) The results are shown in Table 2 below. A + means that the composition passes the conventional test implemented to determine the wear or seizure gears. A − means that the composition does not pass this test.

(5) TABLE-US-00002 TABLE 2 Measured Performance to Composi- parameter be achieved tion 1 FZG A/8.3/90° C. Seizing of the >12 >14 damaged bearing FZG A/8.3/60° C. Seizing of the + damaged bearing FZG A10/16.6R/30 Seizing of the + damaged bearing FZG A10/16.6R/90 Seizing of the delay  9 damaged bearing Micropitting C- Gear wear Minimum 10 Greater GF/8.3/90 according to than 10 FVA 54/I-IV FAG-FE8 D7.5/80-80 Rolling element Maximum 4 mg wear 20 mg FAG-FE8 D7.5/100-80 Rolling element + wear FZG slow speed wear Gear wear + test at 40-60° C., DGMK 377-01 method (C/0.05/90:120/12)

(6) These tests indicate that the composition according to the invention passes the tests used to measure wear and seizure in the gearing, i.e. the composition according to the invention implemented in gearing achieves minimum wear and seizure of the constituent elements of the gearing.

EXAMPLE 3: SEAL COMPATIBILITY

(7) Seal tests were conducted in two ways: FKM-2-168 h/130° C. and 168 h/175° C., Freudenberg tests according to the method described in document FB 73 11 008 “Static and dynamic oil compatibility tests for Freudenberg radial shafts seals to release the usage in Flender-gear units applications (Table T 7300)”, Ed. 2013.

(8) TABLE-US-00003 TABLE 3 Acceptable limits in % Composition 1 Seal tests - FKM-2 - 168 h/130° C. Volume variation Less than 7/8 0.3 Hardness variation delay 0.3 Breaking load variation Less than 25 −0.7 Elongation breaking variation Less than 25 5.4 Seal tests - FKM-2 - 168 h/175° C. Volume variation Less than 7/8 −1.2 Hardness variation delay 1.05 Breaking load variation Less than 25 −7.8 Elongation breaking variation Less than 25 −2.5
Nd: Not Determined

(9) TABLE-US-00004 Acceptable Freudenberg tests limits in % Composition 1 Elastomer FKM 585 130° C./1000 h Volume variation (%) −2/+5 2.1 Hardness variation −5/+5 −1.2 Breaking load variation (%) −50/+20 12.9 Elongation breaking variation (%) −60/+20 −13.9 Elastomer NBR 902 95° C./1000 h Volume variation (%) −2/+5 1.8 Hardness variation −5/+5 −3.3 Breaking load variation (%) −50/+20 −11.1 Elongation breaking variation (%) −60/+20 −21.1 Elastomer FKM 260466 130° C./1000 h Volume variation (%) −2/+5 0.9 Hardness variation −5/+5 −1 Breaking load variation (%) −50/+20 9.5 Elongation breaking variation (%) −60/+20 5

(10) These results show that the lubricant composition according to the invention is compatible with the various seals studied and does not deteriorate the properties of the seals.