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Lubricating oil composition with reduced phosphorus levels

Inactive Publication Date: 2006-10-05
SI GROUP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] One aspect of the present invention is directed toward a novel lubricating oil composition for an internal combustion engine that provides superior deposit control while still retaining excellent viscosity control. Another aspect of the present invention is directed to the use of the novel lubricating oil composition to reduce the amount of deposits in an internal combustion engine. Yet another aspect of the present invention is directed to the use of the novel lubricating oil composition to reduce the poisoning of the catalyst in an internal combustion engine system.

Problems solved by technology

This is a difficult task with existing lubricants because the most effective anti-wear and antioxidant additives are the phosphorus-containing zinc dialkyldithiophosphates (ZDDPs).
However, in the future, ZDDP will only be allowed at low levels.
However, it is also known that higher levels of ashless antioxidants do not always lead to improved oxidation control.
In addition, specifications for deposit control are becoming more demanding.
% may not be adequate for proper protection of the lubricant and engine.
These high levels of conventional ashless antioxidants become costly and may also lead to lubricant deficiencies such as corrosion, rust, and seal incompatibility.

Method used

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  • Lubricating oil composition with reduced phosphorus levels
  • Lubricating oil composition with reduced phosphorus levels
  • Lubricating oil composition with reduced phosphorus levels

Examples

Experimental program
Comparison scheme
Effect test

example a

[0172] A preblend was prepared by blending the following materials: [0173] 150N Group II Baseoil, 92.1 wt. %; [0174] an ashless dispersant concentrate, 4.92 wt. %; [0175] an overbased detergent concentrate containing calcium, 1.85 wt. %; [0176] a neutral detergent concentrate containing calcium, 0.51 wt. %; and [0177] a secondary zinc dialkyldithiophosphate, 0.62 wt.

[0178] To this preblend was added the following components as indicated in Table 2 in preparation of a variety of engine oils. The finished engine oil contained the following (calculated): calcium 2400 ppm; phosphorus 470 ppm; zinc 520 ppm; and had a total base number of 7.5 mg KOH / g of oil.

[0179] The finished oils were tested in the TEOST MHT according to ASTM D7097. The certified medium deposit reference oil produced 60.6 mg of deposits in a calibration experiment. The certified high deposit reference oil produced 96.8 mg of deposits in a calibration experiment; these results represent a severe condition for the TEOS...

example b

Oil Thickening and Oxidation at Elevated Temperatures

[0183] A preblend was prepared by blending the following materials: [0184] 4.92 wt. % of an ashless dispersant concentrate; [0185] 1.85 wt. % of an overbased detergent concentrate containing calcium; [0186] 0.51 wt. % of a neutral detergent concentrate containing calcium; [0187]0.62 wt. % of a secondary zinc dialkyldithiophosphate; and [0188] 92.10 wt. % of a 150N Group II baseoil.

[0189] To this engine oil preblehd was added the components indicated in Table 3.

TABLE 3Components of Examples B.1-B.6.EngineOil Ex.PreblendHPENDPAZDDPMoNSOMBDTBPG2BOTotalNo.Example Type(wt %)(wt %)(wt %)(wt %)(wt %)(wt %)(wt %)(wt %)(wt %)B.1Comparative97.500.750.751.00100.00B.2Comparative97.500.750.750.290.71100.00B.3Comparative97.500.750.750.500.50100.00B.4Comparative97.500.750.751.00100.00B.5Comparative97.500.750.750.250.500.25100.00B.6Invention97.500.750.500.400.85100.00

MoN = A nitrogen-containing organomolybdenum compound containing 7.2 wt. % m...

example c

Oil Thickening and Oxidation

[0193] Oils A.2, A.3, A.7, A.9, A.11, A.13, A.15, A.16, and A.17 (Table 2) were evaluated in the bulk oil oxidation test described in Example B. In this study the oils were heated in a heating block at 150° C., while 10 liters / hour of dry oxygen was bubbled through the oil. Samples of the oxidized oils were removed at 24, 48, 72 and 96 hours. Kinematic viscosities of each sample were determined at 40° C. The percent viscosity increase of the oxidized oil versus the fresh oil was calculated. The percent viscosity increase results are shown in Table 5.

TABLE 5Percent viscosity increase of oils A.2, A.3, A.7, A.9, and A.11 in bulk oil oxidation test.TimeOil A.2Oil A.3Oil A.7Oil A.9Oil A.11Oil A.13Oil A.15Oil A.16Oil A.17(hrs)Compar.Compar.Compar.Compar.InventiveCompar.Compar.InventiveInventive24201001n / an / an / an / a485111215148522.10.701.6721933134292012073.01.90.73.39646175311295355262.82.01.5−0.3

n / a = not measured

[0194] These results show that Oil A.11 is ...

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Abstract

This invention is generally related to a low phosphorus lubricant for an internal combustion engine that provides superior deposit control while still retaining excellent viscosity control.

Description

REFERENCE OF RELATED APPLICATION [0001] This application claims priority to U.S. Provisional Patent Application No. 60 / 665,961 filed Mar. 29, 2005, the disclosure of which is herein incorporated by reference in its entirety.FIELD OF THE INVENTION [0002] The invention generally relates to a low phosphorus lubricant for an internal combustion engine that provides superior deposit control while still retaining excellent viscosity control. BACKGROUND [0003] Future engine oil lubricants will be required to have low levels of phosphorus to protect the emission system, but will also need to provide broad oxidation protection to the lubricant and reduced wear and deposits in the engine. This is a difficult task with existing lubricants because the most effective anti-wear and antioxidant additives are the phosphorus-containing zinc dialkyldithiophosphates (ZDDPs). In the past, high levels of ZDDP were used because ZDDPs were low cost materials and provided superior anti-wear and oxidation p...

Claims

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Application Information

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IPC IPC(8): C10M133/06
CPCC10M141/06C10M141/10C10N2240/10C10M169/04C10M169/044C10M169/045C10M169/048C10M2203/1006C10M2205/0285C10M2207/024C10M2207/026C10M2207/281C10M2207/2825C10M2207/283C10M2207/2835C10M2207/2845C10M2215/064C10M2219/022C10M2219/068C10M2223/045C10N2210/02C10N2210/06C10N2230/04C10N2230/10C10N2230/38C10N2230/40C10N2230/42C10N2230/50C10N2230/74C10N2010/12C10N2030/04C10N2030/10C10N2030/38C10N2030/40C10N2030/42C10N2030/50C10N2030/74C10N2040/25C10N2010/04
Inventor GATTO, VINCENT JAMESMOEHLE, WILLIAM EMIL
Owner SI GROUP INC
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