Composition of high performance bearing oil for steel plants

Abstract

The present invention relates to a Zinc free High Performance bearing oil composition for Lubrication of Bearings, Gears & Allied Equipments in Wire Rod Mill (WRM) for Steel Plants.

Claims

1. A zinc free bearing oil composition consisting of: (a) 0.45-0.55 weight % of di-n-octyl-phosphite, tris-nonylphenyl phosphate or i-decyl-diphenyl phosphate as an ashless antiwear or an extreme pressure agent; (b) 0.4 to 1.0 weight % of dialkyl dithiophosphate as an antiwear, extreme pressure or FZG booster; (c) 0.15 weight % of 3-5-bis(1-1-dimethylethyl)-4-hydroxy alkyl ester or a C.sub.7-C.sub.9 alkyl ester as a phenolic oxidation inhibitor; (d) 0.3 weight % of butylated diphenylamine as an aminic oxidation inhibitor; (e) 0.3 weight % of calcium sulphonates as a rust or a corrosion inhibitor I having a sulphonate, wherein the calcium sulphonate has a total base number is a range of 180 to 450; (f) 0.05 to 0.50 weight % of triazole derivative as a metal passivator; (g) 0.02 weight % of poly methacrylates as a pour point depressant; (h) 0.02 weight % of polyacrylate as a defoament as; and (i) 90 to 99.9 weight % of a base, wherein the weight % being based on the total weight of the composition and wherein the composition is zinc free and demulsifier free.

2. The composition as claimed in claim 1, wherein the base oil is selected from the base oil of API Group I, API Group II, API Group III, API Group IV and API Group V and mixture thereof.

3. A process for preparing zinc free bearing oil composition, wherein the process comprises mixing the additives in the amount as mentioned in claim 1 in the base oil at a temperature in the range of 60° C. to 65° C.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) Accordingly the present invention provides a Novel composition comprises combination of following performance additives and the invented composition possesses; a) Additive 1: According to the preferred features of the present invention, additive 1 is based on sulphur and phosphorus antiwear/extreme pressure ashless agent based on alkyl triphenyl phosphorothionate chemistry containing sulphur and phosphorus in the ratio of 1:1 and the alkyl chain length is C.sub.2-C.sub.8. More preferably the alkyl chain length is C.sub.4-C.sub.6. In detailed feature of the present invention, antiwear/extreme pressure additives, not limiting to ashless sulphur and phosphorus chemistry, the ashless antiwear/extreme pressure additive is based on phosphorus chemistry and further in the detailed embodiments it is di-n-octyl-phosphite, tris-nonylphenyl phosphate, i-decyl-diphenyl phosphate or mixture of thereof. This ashless antiwear/extreme pressure agent is present in the range of 0.05 to 2.0 percent by weight of the composition. b) Additive 2: According to the preferred feature of the present invention, additive 2 is based on zinc free system and it is sulphur and phosphorus chemistry based antiwear/extreme pressure/FZG booster additive system comprising of dialkyl dithiophosphate chemistry containing sulphur and phosphorus preferably in the ratio of 2:1. In detailed feature of the present invention, antiwear/extreme pressure additives/FZG booster, not limiting to ashless sulphur and phosphorus chemistry, the antiwear/extreme pressure/FZG booster additive is mixture of amine phosphate wherein phosphorus and nitrogen are in the ratio of 2:1. The antiwear, extreme pressure, FZG booster containing additive system is present in the range of 0.01 to 1.0 percent by weight of the composition. c) Additive 3: According to preferred feature of the present invention, additive 3 is the phenolic oxidation inhibitor comprising of mixtures of alkylated phenolic antioxidant having alkyl chain length of C.sub.2 to C.sub.12. Preferably the alkyl chain length is C.sub.4 to C.sub.8. In the present invention, this is of sterically hindered phenol, benzenepropionic acid, 3-5-bis(1-1-dimethylethyl)-4-hydroxy alkyl ester, salt of 4-nonylphenoxy compounds or mixture thereof. The alkyl chain length is of C.sub.4 to C.sub.10. Preferably the alkyl chain length is C.sub.7-C.sub.9. According to preferred feature of the present invention, one of the oxidation inhibitor is present in the range of 0.01 to 1.0 percent by weight of the composition. d) Additive 4: According to preferred feature of the present invention, additive 4 is the aminic oxidation inhibitor comprising of alkylated diphenyl amine antioxidant having alkyl chain length of C.sub.2 to C.sub.10. Preferably the alkyl chain length is C.sub.4 to C.sub.8. The diaryl amine or alkylated diaryl amine is phenyl alpha naphthyl amine (PANA), an alkylated diphenyl amine, or an alkylated phenyl naphthyl amine, or mixture thereof. The alkylated diphenylamine includes di-nonylated diphenyl amine, nonyl diphenyl amine, octyl diphenyl amine, di-octylated diphenyl amine, decyl diphenylamine and mixture thereof. In one embodiment, the alkylated diphenyl amine includes nonyl diphenyl amine or di-nonyl diphenyl amine. The alkylated diaryl amine includes butyl, octyl, di-octyl, nonyl, di-nonyl or di-decyl phenyl naphthyl amines. According to preferred feature of the present invention, one of the aminic oxidation inhibitor is present in the range of 0.01 to 1.0 percent by weight of the composition. e) Additive 5: In detailed feature of the present invention, the Rust/Corrosion inhibitor comprises of, not limiting to, metal containing neutral sulphonate or high TBN (total base number) sulphonate, succinic acid ester, amine phosphate or mixture thereof. According to preferred feature of the present invention, additive 5 is the rust/corrosion inhibitor alkali metal or alkaline earth metal containing phenates and/or sulphonates. The alkali metal or alkaline earth metal sulphonates are alkaline earth metal salts preferably the sodium, magnesium or calcium salt or more preferably the calcium salt of an alkyl aromatic sulphonic acid. The alkyl aromatic sulphonic acid is petroleum sulphonic acids or synthetic sulphonic acids available commercially. The alkali metal or alkaline earth metal phenates are the alkali metal salts preferably the sodium, magnesium or calcium salt or more preferably the calcium salts of alkylphenols, alkyl phenolsulfides. The metal containing sulphonates is neutral salt or an over based salt or mixture thereof. The overbased sulphonate in the present invention have total base no. of 180 to 450 TBN. The over based sulphonate present in this invention preferably of 300 TBN. According to the present invention, metal containing sulphonates is in the range of 0.01 to 0.60 percent by weight of the composition. f) Additive 6: According to preferred feature of the present invention, additive 6 is the amine phosphate derivative or succinic acid ester, alkyl sarkosinate, iso-nonyl phenoxy acetic acid, or boron derivatives. The amine phosphate derivate is mixture of amine phosphate derivative with multifunctional property and phosphorus and nitrogen is in the ratio of 2:1. The succinic acid ester is having total acid no. of 160-185 mg KOH/gm. The alkyl sarkosinate is n-cis-9-octadecanoyl sarcosine, n-cis-decenoylsarcosine, n-oleoyl sarcosinate, n-oleyl sarcosine or oleyl sarcosine and the alkyl sarkosinate having alkyl chain length of C.sub.10-C.sub.21 and more preferably to C.sub.17-C.sub.20. In the detailed embodiment, rust and corrosion inhibitors is in the range of 0.01 to 1.2 percent by weight of the composition. g) Additive 7: The metal passivator is derivatives of benzotriazole or tolutriazole or derivatives of thiadiazole. According to the preferred embodiment metal passivator is the mixture of derivatives of benzotriazole or tolutriazole or derivatives of thiadiazole. The preferred range is from 0.001 to 0.50 percent by weight of the composition. h) Additive 8: According to preferred feature of the present invention, the composition further comprises a pour point depressant, wherein, the pour point depressant is selected from a group comprising poly methacrylates, polyacrylamides, alkyl or poly alkyl methacrylate derivative or olefin copolymer, derivates of olefin co-polymer or derivatives of polyalkylene. The preferred range is from 0.001 to 1.0 percent by weight of the composition. i) Additive 9: In detailed feature of the present invention, the defoamer is selected from a group comprising of organic polyacrylate polymer or commercially available ash containing defoamer. The anti-foam agent comprises of, not limiting to, ashless alkyl acrylic, silicone, poly siloxane, poly dimethyl siloxane or mixture thereof as anti-foam agent and it is in the range of 0.001 to 0.25 percent weight of the composition. j) Additive 10: The demulsifier is selected from a group comprising of condensed polymeric alcohols, esters of fatty acids, fatty alcohols alkoxylated with alkylene oxides, and mixtures thereof. The novel composition of high performance bearing oil optionally contains demulsifier in a sufficient amount to provide excellent demulsifying property. The demulsifiers are selected from the group comprising of condensed polymeric alcohols, esters of fatty acids, fatty alcohols alkoxylated with alkylene oxides, or mixtures thereof. The preferred range in the bearing oil composition is from 0.001 to 0.05 percent by weight. k) Base oils—New quality base oils of API Group I/II/III/IV/V & its mixture thereof According to preferred feature of the present invention, the mixture of severely refined base stocks, or hydrotreated/hydro-processed/iso-dewaxed base stocks, or hydrotreated/hydro-processed/iso-dewaxed base stocks and alkylated naphthalene, or mixture of synthetic bases and ester or mixture of synthetic bases and alkylated naphthalene or alkylated naphthalene bases or mixtures thereof is selected from combination of premium quality base oils of API Group II, Group III and base oils of Group IV, Group V class. In detailed embodiment, the Base oils comprises of, not limiting to, combination of new quality base oils of API Group I/II/III/IV/V & its mixture thereof and it is in the range of 90% wt. to 99.9% wt.

(2) The composition of novel high performance bearing oil includes combination of premium quality base oils of API Group I, Group II, Group III and base oils of Group IV, Group V class, as defined in the API interchangeability guidelines, or mixtures thereof. These base oils are commercially available in the market.

(3) According to another preferred feature of the present invention, the composition is used for enhancing water shedding property of bearing oil for heavy duty applications of no-twist wire rod mills (WRM) in steel plants.

(4) In one of the preferred feature, the present invention provides a novel bearing oil additive composition comprising:

(5) (a) sulphur, phosphorus based anti-wear, extreme pressure and FZG booster containing additives; and

(6) (b) mixture of phenolic and aminic antioxidants; and

(7) (c) metal containing rust & corrosion inhibitors; and

(8) (d) metal passivator, and

(9) (e) a pour point depressant, demulsifier and antifoam agents.

(10) The present invention also provides a process for preparing high performance bearing oil additive composition by mixing the appropriate amount of chosen additives or additive systems in a beaker/container. The additives combinations are further optimized in combination of selected hydrocarbon base oils to achieve desired performance in the laboratory tests. The chosen additives are mixed in selected base oils for preparing the candidates at an appropriate temperature such as an average blending temperature of 60° C. to 65° C., so that mixture gets bright, clear and homogeneous.

(11) The referred formulae are suitable to use as bearing oil of different ISO viscosity grades. The viscosity grade is of ISO VG 100 to ISO VG 680 as recommended by the OEMs for no-twist wire rod mills. The composition is used in various wire rod mill applications in metal industry. Various physico-chemical & tribological performance tests were conducted to assess the performance in laboratory and thereafter field validation was done on promising candidate in a steel plant.

EXAMPLES

(12) The examples (1 to 24) are listed in Table-1, Table-2 and Table-3 and these examples were prepared by mixing the components in percentage by weight.

(13) The base oils used in the examples are of API Group I, Group II, Group III, Group IV & Group V types or mixture thereof. These base oils are commercially available in the market.

(14) The array of commercially available additives and additive systems were selected in various combinations to achieve best performance. The additives includes antiwear/extreme pressure & FZG booster agents, rust & corrosion inhibitors, antioxidants, metal deactivator, pour point depressant, demulsifier, defoament, etc.

(15) The candidate blends were prepared and tested for various physico-chemical tests including performance properties such as kinematic viscosity, pour point, flash point, foam, copper strip corrosion, rust test, demulsibility as per ASTM D 1401 and ASTM D 2711 (modified) and tribological tests as per OEM designed industry antiwear type bearing oil standard. ASTM D 2711 (modified) test has been carried out at test temperature of 52° C. instead of 82° C. specified in the standard.

(16) In general, an antiwear bearing oil (ISO VG 100) is recommended for lubrication of bearings & gears in cassettes and wire rod block however higher viscosity grade (ISO VG 150 or higher) is recommended in roughing or pre-finishing strand in no-twist wire rod mill or bar mill in steel plants. The kinematic viscosity was tested as per ASTM D 445. The viscosity index of the composition found to be >95 as per ASTM D 2270. The pour point of the compositions were measured by ASTM D 97 and was found to be above (−) 15° C. which provides the low temperature performance of the composition when the oil is used at conditions where the ambient is low. The water separability behavior or demulsibility test was carried out as per ASTM D 1401 and was found to vary for various compositions from a time period of 10 minutes to 25 minutes with different amount of oil, water and emulsion separation. The excellent water separating characteristics of the composition even in the absence of a suitable demulsifier makes it a promising candidate for the heavy duty bearing oil lubrication. The inferior water separation property of the bearing oil composition can cause various issues in field such as rusting, leaching of additive system, sludge generation, clogging of the filters used in operation, inferior film formation on critical equipment parts and thereby leading to insufficient performance of oil lubrication. The water separation characteristics as determined by modified ASTM D 2711 where the turbulence caused during pumping and circulation of the lubricating oil in the wire rod block system which can cause emulsion forming tendency therefore bearing oil must possess excellent water shedding property during extended operation. The compositions showed poor, moderate and excellent demulsibility characteristics. The compositions were tested for air release value as per ASTM D 3427, resistance towards copper corrosion was studied by ASTM D 130 and rust prevention characteristics of the composition were studied by ASTM D 665. The oxidative life of the composition found to be more than three times to industry accepted product when studied by rotating pressure vessel test (RPVOT) as per ASTM D 2272 establishing superb oxidation stability.

(17) TABLE-US-00001 TABLE 1 Example 1 to Example 9 Components Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 API Group I 22.000  — — 22.000  96.390  96.390  24.000  27.000  24.000  API Group 77.679  91.877  — 76.570  — — — 71.770  72.610  II API Group — — — — — — 72.310  — — III API Group — 5.000 76.450  — — — 3.000 — 3.000 IV API Group V — — 22.000  — — — — — — Additive 1 0.050 1.450 0.900 0.550 0.300 0.300 0.400 0.500 — Additive 2 — 0.050 — 0.040 0.100 0.100 — 0.040 — Additive 3 0.010 0.500 0.500 0.150 0.450 — — 0.150 — Additive 4 0.100 0.500 0.100 0.300 — 0.450 0.200 0.150 0.200 Additive 5 — 0.600 0.010 0.300 — — — 0.300 — Additive 6 0.100 — — — 1.200 1.200 — — 0.100 Additive 7 0.030 0.001 0.010 0.050 0.300 0.300 0.050 0.050 0.050 Additive 8 0.001 0.020 0.010 0.020 1.000 1.000 0.020 0.020 0.020 Additive 9 0.010 0.001 0.020 0.020 0.250 0.250 0.020 0.020 0.020 Additive 10 0.020 0.001 — — 0.010 0.010 — — — Total (% wt.) 100.000  100.000  100.000  100.000  100.000  100.000  100.000  100.000  100.000 

(18) TABLE-US-00002 TABLE 2 Example 10 to Example 17 Example Example Example Example Example Example Components Example 10 Example 11 12 13 14 15 16 17 API Group I 22.000  22.000  22.000  22.000  — 22.000  22.000  22.000  API Group II — 76.119  — 76.440  76.520  76.020  76.510  76.910  API Group III — — 76.020  — — — — — API Group IV 77.010  — — — — — — — API Group V — — — — 22.000  — — — Additive 1 0.550 0.550 0.550 0.550 0.550 0.550 0.550 0.050 Additive 2 0.040 0.040 0.040 0.040 0.040 0.040 0.040 — Additive 3 0.010 0.600 1.000 — — — 0.250 0.200 Additive 4 — — — 0.100 0.500 1.000 0.250 0.250 Additive 5 0.300 — 0.300 0.300 0.300 0.300 0.300 0.500 Additive 6 — 0.600 — — — — — — Additive 7 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 Additive 8 0.020 0.020 0.020 0.500 0.020 0.020 0.020 0.020 Additive 9 0.020 0.020 0.020 0.020 0.020 0.020 0.020 0.020 Additive 10 — 0.001 — — — — 0.010 — Total (% wt.) 100.000  100.000  100.000  100.000  100.000  100.000  100.000  100.000 

(19) TABLE-US-00003 TABLE 3 Example 18 to Example 24 Example Example Example Example Example Example Example Components 18 19 20 21 22 23 24 API Group I — 22.000  22.000  22.000  22.000  22.000  23.500  API Group II 75.960  74.960  — — 75.960  76.160  75.600  API Group III — — 76.900  — — — — API Group IV — — — 76.110  — — — API Group V 22.000  — — — — — — Additive 1 1.000 2.000 — — — 0.450 0.500 Additive 2 — — 0.010 0.750 1.000 0.100 0.100 Additive 3 0.200 0.200 0.200 0.200 0.200 0.150 0.050 Additive 4 0.250 0.250 0.250 0.250 0.250 0.300 0.150 Additive 5 0.500 0.500 0.500 0.500 0.500 0.300 — Additive 6 — — — — — — 0.010 Additive 7 0.050 0.050 0.050 0.050 0.050 0.500 0.050 Additive 8 0.020 0.020 0.020 0.020 0.020 0.020 0.020 Additive 9 0.020 0.020 0.020 0.120 0.020 0.020 0.020 Additive 10 — — 0.050 — — — — Total (% wt.) 100.000  100.000  100.000  100.000  100.000  100.000  100.000 

(20) The examples 1 to 24 as illustrated in table 1, table 2 and table 3 were evaluated for various physico-chemical properties (table 4, table 5 & table 6). The candidates (i.e. example 2, example 7, example 9 & example 19) found dull in appearance and further evaluation of these examples were not done (ND).

(21) TABLE-US-00004 TABLE 4 Physico-chemical Properties (Examples 1 to 8) No. Properties Method Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 1 Appearance Visual Clear Dull Clear Clear Clear Clear Dull Clear 2 Kin. D 445 97.77 96.34 97.60 96.63 95.88 96.54 94.90 96.45 Visc@40° C., cSt 4 Kin. D 445 11.86 11.98 12.02 11.95 11.68 11.66 11.75 11.75 Visc@100° C., cSt 5 Viscosity D 2270 111 114 114 114 111 110 114 111 Index 6 Demulsibility D 1401 40-38-2 ND 40-37-3 40-40-0 40-37- 40-37- ND 40-40- @82° C., (10) (15) (10) 3 (15) 3 (15) 0 (10) minutes 7 Copper D 130 1b ND 1a 1a 1a 1a ND 1a Strip corrosion @100° C. for 3 hrs 8 Rust test D 665 B Pass ND Fail Pass Pass Pass ND Pass 9 RPVOT, D 2272 270 ND 480 590 310 380 ND 430 minutes 10 Demulsibility D 2711 Pass ND Pass Pass Pass Pass ND Fail @52° C., (modified)

(22) TABLE-US-00005 TABLE 5 Physico-chemical Properties (Examples 9 to 16) Example Example Example Example Example Example Example No. Properties Method Example 9 10 11 12 13 14 15 16 1 Appearance Visual Dull Clear Clear Clear Clear Clear Clear Clear 2 Kin. D 445 97.41 97.62 97.45 97.42 97.54 97.63 97.68 97.62 Visc@40° C., cSt 4 Kin. D 445 11.79 11.84 11.79 11.80 11.87 11.76 11.77 11.75 Visc@100° C., cSt 5 Viscosity D 2270 110 111 110 111 112 110 110 110 Index 6 Demulsibility D 1401 ND 40-38-2 40-37-3 40-37-3 40-40- 40-37- 40-37- 40-37- @82° C., (10) (10) (15) 0 (10) 3 (15) 3 (15) 3 (10) minutes 7 Copper D 130 ND 1a 1a 1a 1a 1a 1a 1a Strip corrosion @100° C. for 3 hrs 8 Rust test D 665 B ND Pass Pass Pass Pass Pass Pass Pass 9 RPVOT, D 2272 ND 100 440 680 150 425 610 630 minutes 10 Demulsibility D 2711 ND Pass Pass Pass Pass Pass Pass Pass @52° C., (modified)

(23) TABLE-US-00006 TABLE 6 Physico-chemical Properties (Examples 17 to 24) Example Example Example Example Example Example Example Example No. Properties Method 17 18 19 20 21 22 23 24 1 Appearance Visual Clear Clear Dull Clear Clear Clear Clear Clear 2 Kin. D 445 97.42 97.40 97.35 96.84 96.44 96.21 97.62 97.80 Visc@40° C., cSt 4 Kin. D 445 11.75 11.72 11.76 11.82 11.75 11.70 11.75 11.80 Visc@100° C., cSt 5 Viscosity D 2270 110 109 110 112 111 111 110 110 Index 6 Demulsibility D 1401 40-38-2 40-37-3 ND 40-40-0 40-37- 40-37- 40-37- 40-37- @82° C., (10) (20) (10) 3 (25) 3 (20) 3 (15) 3 (15) minutes 7 Copper D 130 1a 1a ND 1a 1a 1a 1a 1a Strip corrosion @100° C. for 3 hrs 8 Rust test D 665 B Pass Pass ND Pass Pass Pass Pass Fail 9 RPVOT, D 2272 540 510 ND 520 480 490 520 320 minutes 10 Demulsibility @ D 2711 Pass Pass ND Pass Pass Pass Pass Pass 52° C. (modified)

(24) TABLE-US-00007 TABLE 7 Tribological Properties (Examples 1 to 8) No. Properties Method Example 1 Example 3 Example 4 Example 5 Example 6 Example 8 1 Four Ball Wear ASTM 0.65 0.50 0.35 0.45 0.50 0.40 Test @ 20 Kg, D 4172 1800 rpm, 54° C. for 1 hour, mm 2 Weld Load, Kgs. IP 239 112 140 160 140 150 160 3 FZG, Gear Test, DIN51354 8 ND >12 12 10 ND failure load stage, (A/8.3/90)

(25) TABLE-US-00008 TABLE 8 Tribological Properties (Examples 9 to 16) Example Example Example Example Example Example Example No. Properties Method 10 11 12 13 14 15 16 1 Four Ball ASTM 0.40 0.40 0.40 0.40 0.40 0.40 0.40 Wear Test D 4172 @ 20 Kg, 1800 rpm, 54° C. for 1 hour, mm 2 Weld IP 239 160 160 160 160 160 160 160 Load, Kgs. 3 FZG, DIN 8 10 11 9 10 11 12 Gear Test, 51354 failure (A/8.3/90) load stage

(26) TABLE-US-00009 TABLE 9 Tribological Properties (Examples 17 to 24) Example Example Example Example Example Example Example No. Properties Method 17 18 20 21 22 23 24 1 Four ASTM 0.65 0.40 0.70 0.40 0.55 0.35 0.45 Ball D 4172 Wear Test @ 20 Kg, 1800 rpm, 54° C. for 1 hour, mm 2 Weld IP 239 112 160 140 140 140 160 160 Load, Kgs. 3 FZG, DIN 6 8 6 9 7 >12 ND Gear 51354 Test, (A/8.3/90) failure load stage,

(27) The tribological evaluation of the compositions were performed for screening of the samples for weld load as per IP 239 and wear scar diameter by ASTM D 4172 test methods. The heavy duty bearing oil composition was found to have poor, moderate and excellent property in terms of weld load, wear scar diameter as per the standard test methods. In order to assess the load bearing capability, FZG A/8.3/90 test was conducted as per DIN 51354 standard method (table 7, table 8 & table 9).

(28) TABLE-US-00010 TABLE 10 Demulsibility tests (as per ASTM D 2711 (modified) Example Example MNC Property Method Example 4 16 23 product Remarks Demulsibility D 2711 Better test@52° C. modified - demulsification Free water, ml non 34.0 35.0 35.0 34.0 30.0 % water in oil EP 0.4 0.2 0.4 0.4 Report Emulsion, ml method Nil Nil Nil Nil 1.0 Maximum

(29) TABLE-US-00011 TABLE 11 UEC Dynamic Demulsibility Endurance test (DDE) Example Example Property Method Example 4 16 23 Remarks UEC Dynamic UEC (As per OEM demulsibility Dynamic lubricant Endurance Test demulsibility standard) @52° C. (*) Endurance 10 Maximum % water in oil after Test 2.0 4.0 2.0  1 Maximum centrifuging % oil in water after Nil Nil Nil centrifuging (*) Dynamic Demulsibility test conducted at Clark Lab, USA

(30) TABLE-US-00012 TABLE 12 Gradual increase in step load in SRV rig: Example Example MNC Properties Method Example 4 16 23 product Remarks SRV failure SRV >1500 >1300 >1500 800 Significantly load, N higher load carrying ability

(31) Example 4, 16 and 23 found to be promising meeting physico-chemical with superior tribological properties in comparison to industry accepted product.

(32) The coefficient of friction & traction coefficient properties on the composition were studied in SRV and MTM machines.

(33) TABLE-US-00013 TABLE 13 Traction coefficient in Mini Traction Machine (MTM): Details of candidate 4, 16 & 23 Example 4 Speed Load Temperature SRR Remarks (mm/sec) (N) (° C.) (%) (Example 4 in comparison to MNC product) 3000 10 80  0 ~40% less traction coefficient in pure rolling 3000 50 80 40 ~6 to 7% lower traction coefficient in 40% SRR 3000 70 50 40 ~4 to 5% lower traction coefficient in 40% SRR 3000 70 80 40 ~6% lower traction coefficient in 40% SRR Example 16 Speed Load Temperature SRR Remarks (mm/sec) (N) (° C.) (%) (Example 16 in comparison to MNC product) 100 30 40 50 ~3.4% lower traction coefficient in 50% SRR 4000 30 40 50 Comparable with MNC product in 50% SRR  100 30 60 50 ~9% lower traction coefficient in 50% SRR 4000 30 60 50 ~2.8% lower traction coefficient in 50% SRR Example 23 Speed Load Temperature SRR Remarks (mm/sec) (N) (° C.) (%) (Example 23 in comparison to MNC product) 1000 30 50  0 Comparable with MNC product in pure rolling  10 30 50 20 ~52% lower traction coefficient in 20% SRR  100 30 50 20 ~40% lower traction coefficient in 20% SRR 1000 30 50 20 ~18.2% lower traction coefficient in 50% SRR SRR = sliding rolling ratio

(34) The zinc free novel bearing oil composition meet the physico-chemical properties and possess excellent demulsibility characteristics in static and dynamic demulsibility tests and retention in demulsibility property during extended operation in the field.

(35) The novel composition provided superior load bearing capability in gradual increase in step load in SRV test rig (table 12) and better traction coefficient in MTM in pure rolling and at different sliding rolling ratios at different various load and temperatures when compared to the industry accepted product (table 13).

(36) The field validation on novel composition was done in an integrated steel plant in India wherein composition provided superior performance in mill parameters.