EP1613715A1 - All paraffinic, low temperature hydraulic oils - Google Patents

All paraffinic, low temperature hydraulic oils

Info

Publication number
EP1613715A1
EP1613715A1 EP04758581A EP04758581A EP1613715A1 EP 1613715 A1 EP1613715 A1 EP 1613715A1 EP 04758581 A EP04758581 A EP 04758581A EP 04758581 A EP04758581 A EP 04758581A EP 1613715 A1 EP1613715 A1 EP 1613715A1
Authority
EP
European Patent Office
Prior art keywords
composition
viscosity
oil
paraffinic
cst
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04758581A
Other languages
German (de)
French (fr)
Inventor
Kyle D. Lawrence
Lisa A. Semmel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Technology and Engineering Co
Original Assignee
ExxonMobil Research and Engineering Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ExxonMobil Research and Engineering Co filed Critical ExxonMobil Research and Engineering Co
Publication of EP1613715A1 publication Critical patent/EP1613715A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/68—Shear stability
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

Definitions

  • the present invention relates to hydraulic oils. More particularly the present invention relates to low temperature, multi grade, hydraulic oils.
  • Hydraulic fluids are used in a wide variety of applications.
  • hydraulic fluids are used in vehicle transmissions, differentials, brakes and the like and in non- ehicular equipment and machinery used for example in injection molding and general manufacturing.
  • Hydraulic fluids are commercially available in different viscosity grades in order to meet equipment manufacture requirements. Many of these standard hydraulic fluids have difficulty, however, in meeting all of the viscometric properties required for the advanced designs of equipment now being developed and put into use. For example, in order to formulate low temperature, multi-grade hydraulic oils it has been necessary to use naphthenic base stocks or severely hydrotreated basestocks. Each of these approaches has disadvantages.
  • naphthenic basestocks are relatively more expensive than similar viscosity paraffinic basestocks.
  • Another disadvantage is availability. There are fewer producers of naphthenic basestocks than paraffinic basestocks.
  • the present invention comprises a multi-grade hydraulic oil comprising:
  • composition 5 wt% to 10 wt% of a polymethacrylate viscosity index improver having a shear stability index in the range of 0 to 20, wherein the composition has a shear loss of less than 7% after 40 minutes as measured by ASTM D5621 and wherein for any given viscosity grade the composition has at least substantially the same or better Brookfield viscosity at 0°F and -20°F as a naphthenic oil containing hydraulic fluid of the same viscosity grade.
  • composition of the present invention include two Group I paraffinic oils.
  • Group I paraffin oils typically have viscosity indicies in the range of about 80 to 120, contain ⁇ 90% saturates and > 0.03% sulfur.
  • the first Group I paraffinic oil of the present invention is one having a viscosity of 2 to 6 cSt at 100°C and a viscosity index (VI) of 85 to 95. Also, the first Group I paraffinic oil will comprise from 5 wt% to 90 wt%, based on the total weight of the composition.
  • the second Group I paraffinic oil is one having a viscosity of 3 to 15 cSt at 100°C and a VI of 90 to 95.
  • the second Group I oil will be present in the composition in an amount in the range of 5 wt% to 90 wt% based on the total weight of the composition.
  • the hydraulic oil also contains a poly methacrylate viscosity index improver (VII) having a shear stability index in the range of 0 to 20, and preferably 10 to 20.
  • VII poly methacrylate viscosity index improver
  • suitable polymethacrylate VII's will have average molecular weights in the range of about 10,000 to 1,000,000, and more typically between about 20,000 to about 500,000.
  • the amount of this VII component is from 5 wt% to 10 wt%, preferably from 6 wt% to 7.5 wt% based on the weight of the composition.
  • compositions that will have a shear loss of less than 7% after 40 minutes for any given viscosity grade having at least substantially the same low temperature properties as a naphthenic oil containing hydraulic fluid composition of the same viscosity grade.
  • the compositions preferably have the properties shown in Table 1. TABLE 1
  • the hydraulic oil composition will typically include a minor amount of a conventional additive typically used in hydraulic oils such as pour point depressants, anti-oxidants, anti-foam agents and the like.
  • V A Group I paraffinic oil having a viscosity of about 14 cSt at 100°C and a VI of 90.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A paraffinic hydraulic oil having a shear stability index of from 0 to 20, a shear loss of less than 7% as measured by ASTM D5621 and a Brookfield viscosity the same or better than a naphthenic oil of the same viscosity grade is provided. The hydraulic oil includes 5 wt% to 90 wt% of a first paraffinic oil having a KV at 100°C of 2 to 6 cSt, 5 wt% to 90 wt% of a second paraffinic oil having a KV at 100°C of 3 to 14 cSt and 5 wt% to 10 wt% of a polymethacrylate viscosity index improver.

Description

ALL PARAFFINIC, LOW TEMPERATURE HYDRAULIC OILS
Field of the Invention
[0001] The present invention relates to hydraulic oils. More particularly the present invention relates to low temperature, multi grade, hydraulic oils.
Background of the Invention
[0002] Hydraulic fluids are used in a wide variety of applications. For example, hydraulic fluids are used in vehicle transmissions, differentials, brakes and the like and in non- ehicular equipment and machinery used for example in injection molding and general manufacturing.
)3] Hydraulic fluids are commercially available in different viscosity grades in order to meet equipment manufacture requirements. Many of these standard hydraulic fluids have difficulty, however, in meeting all of the viscometric properties required for the advanced designs of equipment now being developed and put into use. For example, in order to formulate low temperature, multi-grade hydraulic oils it has been necessary to use naphthenic base stocks or severely hydrotreated basestocks. Each of these approaches has disadvantages.
[0004] One disadvantage in using naphthenic basestocks is cost. Naphthenic basestocks are relatively more expensive than similar viscosity paraffinic basestocks. Another disadvantage is availability. There are fewer producers of naphthenic basestocks than paraffinic basestocks.
[0005] As with naphthenic basestocks, severely hydrotreated basestocks are more expensive than similar viscosity paraffinic basestocks for substantially the same reasons. Basically fewer refineries produce severely hydrotreated basestocks compared to paraffinic basestocks.
[0006] It would be desirable therefore to be able to have a low temperature, multi-grade hydraulic oil that did not require the use of a naphthenic basestock or a severely hydrotreated basestock.
Summary of Invention
[0007] Broadly stated the present invention comprises a multi-grade hydraulic oil comprising:
(a) 5 wt% to 90 wt% of a first paraffinic oil having a kinematic viscosity at 100°C of between 2 to 6 cSt;
(b) 5 wt% to 90 wt% of a second paraffinic oil having a kinematic viscosity at 100°C of between 3 to 14 cSt; and
(c) 5 wt% to 10 wt% of a polymethacrylate viscosity index improver having a shear stability index in the range of 0 to 20, wherein the composition has a shear loss of less than 7% after 40 minutes as measured by ASTM D5621 and wherein for any given viscosity grade the composition has at least substantially the same or better Brookfield viscosity at 0°F and -20°F as a naphthenic oil containing hydraulic fluid of the same viscosity grade.
Detailed Description of the Invention
[0008] The composition of the present invention include two Group I paraffinic oils. Group I paraffin oils typically have viscosity indicies in the range of about 80 to 120, contain < 90% saturates and > 0.03% sulfur.
[0009] The first Group I paraffinic oil of the present invention is one having a viscosity of 2 to 6 cSt at 100°C and a viscosity index (VI) of 85 to 95. Also, the first Group I paraffinic oil will comprise from 5 wt% to 90 wt%, based on the total weight of the composition.
[0010] The second Group I paraffinic oil is one having a viscosity of 3 to 15 cSt at 100°C and a VI of 90 to 95. The second Group I oil will be present in the composition in an amount in the range of 5 wt% to 90 wt% based on the total weight of the composition.
[0011] The hydraulic oil also contains a poly methacrylate viscosity index improver (VII) having a shear stability index in the range of 0 to 20, and preferably 10 to 20. Typically suitable polymethacrylate VII's will have average molecular weights in the range of about 10,000 to 1,000,000, and more typically between about 20,000 to about 500,000. The amount of this VII component is from 5 wt% to 10 wt%, preferably from 6 wt% to 7.5 wt% based on the weight of the composition.
[0012] The foregoing components must be carefully selected and their relative amounts balanced to obtain compositions that will have a shear loss of less than 7% after 40 minutes for any given viscosity grade having at least substantially the same low temperature properties as a naphthenic oil containing hydraulic fluid composition of the same viscosity grade. For hydraulic oils of viscosity grades 15 to 150 the compositions preferably have the properties shown in Table 1. TABLE 1
I I
N.A. = Not Applicable
[0013] In addition to the foregoing components the hydraulic oil composition will typically include a minor amount of a conventional additive typically used in hydraulic oils such as pour point depressants, anti-oxidants, anti-foam agents and the like.
Examples
[0014] The invention will be illustrated by the following examples which include preferred embodiments thereof. For the examples the following components were used to prepare hydraulic fluids of the specified ISO viscosity grade:
I A Group I paraffinic oil having a viscosity of about 2.6 cSt at 100°C and a VI of 85.
II A Group I paraffinic oil having a viscosity of about 4 cSt at 100°C and a VI of 95.
III A Group I paraffinic oil having a viscosity of about 5.4 cSt at 100°C and a VI of 95.
IV A Group I paraffinic oil having a viscosity of about 7 and a VI of 95.
V A Group I paraffinic oil having a viscosity of about 14 cSt at 100°C and a VI of 90.
VI A poly methacrylate VII having a shear stability index of about 14 and sold by RohMax under the trade name Viscoplex 8-219.
VII A commercial additive package containing a pour point depressant and components such as an antiwear additive, corrosion inhibitor, antioxidant and defoamant. These various components were used in the amounts shown in Table 2 and the properties thereof are also given. TABLE 2
I I
N.A. = Not Applicable
For comparative purposes three ISO 32 multi-grade hydraulic oils were prepared and their properties determined. The compositions and results are given in Table 3 which also includes properties for a commercial, naphthenic containing, hydraulic oil. As can be seen while Blend 1 had a shear loss less than 7% it did not have low temperature properties. Blend 2 failed on shear loss and pour point and blend 3 failed the Brookfield - 20°F viscosity and pour point.
TABLE 3
I
00 I

Claims

CLAIMS:
1. A hydraulic oil composition comprising:
(a) 5 wt% to 90 wt%, based on the composition, of a first paraffinic oil having a viscosity at 100°C of between 2 to 6 cSt;
(b) 5 wt% to 90 wt%, based on the composition of a second paraffinic oil having a viscosity at 100°C of between 3 to 15 cSt; and
(c) 5 wt% to 10 wt%, based on the composition, of a polymethacrylate viscosity index improver having a shear stability index in the range of 0 to 20
wherein the composition has a shear loss of less than 7% after 40 minutes as measured by ASTM 5621 and wherein for any given viscosity grade the composition has at least substantially the same or better Brookfield viscosity at 0°F and -20°F as a naphthenic oil containing hydraulic composition of the same viscosity
2. An oil composition according to claim 1 wherein for each viscosity grade listed below the composition has the properties listed:
3. The composition of claims 1 and 2 wherein the viscosity index improver has an average molecular weight of from 10,000 to 1,000,000.
4. The composition of claim 3 including a minor amount of at least one hydraulic oil additive.
5. The composition of claim 4 wherein the additive is at least one of pour point depressant, antiwear additive, corrosion inhibitor, antioxidant and defoamant.
6. A hydraulic oil composition comprising:
(a) 5 wt% to 90 wt% of a first paraffinic oil having a viscosity of 2 to 6 cSt at 100°C and a VI of 85 to 95;
(b) 5 wt% to 90 wt% of a second paraffinic oil having a viscosity of 3 to 15 cSt at 100°C and a VI of 90 to 95; and
(c) 5 wt% to 10 wt% of a polymethacrylate viscosity index improver having a shear stability of 0 to 20;
wherein the wt% are based on the total weight of the composition;
wherein the composition has a shear loss of less than 7% after 40 minutes as measured by ASTM 5621; and
wherein for each viscosity grade listed below the composition has the maximum pour point and Brookfield viscosities (BV) listed:
EP04758581A 2003-03-28 2004-03-26 All paraffinic, low temperature hydraulic oils Withdrawn EP1613715A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US45863903P 2003-03-28 2003-03-28
US10/802,607 US20040242438A1 (en) 2003-03-28 2004-03-17 All paraffinic, low temperature hydraulic oils
PCT/US2004/009893 WO2004087851A1 (en) 2003-03-28 2004-03-26 All paraffinic, low temperature hydraulic oils

Publications (1)

Publication Number Publication Date
EP1613715A1 true EP1613715A1 (en) 2006-01-11

Family

ID=33135108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04758581A Withdrawn EP1613715A1 (en) 2003-03-28 2004-03-26 All paraffinic, low temperature hydraulic oils

Country Status (7)

Country Link
US (1) US20040242438A1 (en)
EP (1) EP1613715A1 (en)
JP (1) JP2006521459A (en)
AU (1) AU2004225441A1 (en)
BR (1) BRPI0408301A (en)
CA (1) CA2517455A1 (en)
WO (1) WO2004087851A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7648950B2 (en) * 2005-04-22 2010-01-19 Rohmax Additives Gmbh Use of a polyalkylmethacrylate polymer
US20070197411A1 (en) * 2005-10-13 2007-08-23 Hiroshi Kaneko Lubricating oil composition
CN111234905B (en) * 2020-01-13 2022-08-09 江苏龙蟠科技股份有限公司 Ultra-low temperature heavy-duty vehicle gear oil composition

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
GB1404660A (en) * 1971-11-26 1975-09-03 Standard Oil Co Five-grade motor oil for internal combustion engines
US4776967A (en) * 1987-02-27 1988-10-11 Idemitsu Kosan Company Limited Lubricating oil composition
JP2555284B2 (en) * 1987-05-14 1996-11-20 出光興産株式会社 Lubricant composition with improved temperature characteristics
DE4000753A1 (en) * 1990-01-12 1991-07-18 Roehm Gmbh POWER TRANSFER FLUID BASED ON MINERAL OIL
US5520832A (en) * 1994-10-28 1996-05-28 Exxon Research And Engineering Company Tractor hydraulic fluid with wide temperature range (Law180)
US5641733A (en) * 1995-07-17 1997-06-24 Exxon Chemical Patents Inc. Automatic transmission fluids of improved viscometric properties
US5641732A (en) * 1995-07-17 1997-06-24 Exxon Chemical Patents Inc. Automatic transmission fluids of improved viscometric properties
US6077455A (en) * 1995-07-17 2000-06-20 Exxon Chemical Patents Inc Automatic transmission fluid of improved viscometric properties
US5942472A (en) * 1997-06-12 1999-08-24 Exxon Chemical Patents Inc. Power transmission fluids of improved viscometric and anti-shudder properties
US5888946A (en) * 1997-12-30 1999-03-30 Chevron U.S.A. Inc. Tractor hydraulic fluid
US6660695B2 (en) * 2002-03-15 2003-12-09 Infineum International Ltd. Power transmission fluids of improved anti-shudder properties

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
US20040242438A1 (en) 2004-12-02
WO2004087851A1 (en) 2004-10-14
AU2004225441A1 (en) 2004-10-14
CA2517455A1 (en) 2004-10-14
JP2006521459A (en) 2006-09-21
BRPI0408301A (en) 2006-03-07

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