(19)
(11) EP 3 143 110 B1

(12) EUROPEAN PATENT SPECIFICATION

(45) Mention of the grant of the patent:
03.07.2019 Bulletin 2019/27

(21) Application number: 15721760.5

(22) Date of filing: 05.05.2015
(51) International Patent Classification (IPC): 
C10M 173/02(2006.01)
(86) International application number:
PCT/FI2015/050302
(87) International publication number:
WO 2015/173465 (19.11.2015 Gazette 2015/46)

(54)

LUBRICANT COMPOSITION

SCHMIERMITTELZUSAMMENSETZUNG

COMPOSITION DE LUBRIFIANT

(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 15.05.2014 FI 20145441

(43) Date of publication of application:
22.03.2017 Bulletin 2017/12

(73) Proprietor: Jarmat OY
74120 Iisalmi (FI)

(72) Inventor:
  • KYLLÖNEN, Matti
    FI-74120 Iisalmi (FI)

(74) Representative: Boco IP Oy Ab 
Itämerenkatu 5
00180 Helsinki
00180 Helsinki (FI)


(56) References cited: : 
US-A- 3 935 124
US-A1- 2004 053 792
 US-A1- 2004 033 205
US-A1- 2005 277 556
   
       
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    FIELD OF THE INVENTION



    [0001] The invention relates to a lubricant composition, and particularly to a lubricant composition comprising glycerol, water and carboxymethyl cellulose.

    BACKGROUND OF THE INVENTION



    [0002] Document WO 01/98441 discloses a conveyor lubricant composition comprising water, glycerol and carboxymethyl cellulose.

    [0003] Carboxymethyl cellulose may be used in a lubricant as thickener and tackiefier.

    [0004] A problem with the known lubricant comprising carboxymethyl cellulose is that the viscosity of carboxymethyl cellulose drops when the lubricant is in contact with iron, calcium, aluminum and/or oxygen. Lubricant is often stored in a stainless steel container or in some other container where it is in contact with air, which reduces the storage time of the lubricant significantly. When the viscosity drops, the thickening and tackifying effect of carboxymethyl cellulose is lost.

    BRIEF DESCRIPTION OF THE INVENTION



    [0005] An object of the present invention is to provide a lubricant composition so as to overcome the above problem.

    [0006] The objects of the invention are achieved by a lubricant composition and use thereof which are characterized by what is stated in the independent claims. The preferred embodiments of the invention are disclosed in the dependent claims.

    [0007] The invention is based on the idea of providing a lubricant composition comprising glycerol, water and carboxymethyl cellulose, wherein the composition further comprises sodium polyphosphate.

    [0008] An advantage of the lubricant composition of the invention is that sodium polyphosphate surprisingly inhibits the reduction of the viscosity of the composition when the lubricant composition is in contact with iron, calcium, aluminum and/or oxygen.

    [0009] An advantage of the lubricant composition of the invention is also that sodium polyphosphate surprisingly lowers the pour point of the lubricant composition, which allows using the lubricant composition in lower temperatures.

    DETAILED DESCRIPTION OF THE INVENTION



    [0010] The invention relates to a lubricant composition comprising glycerol, water and carboxymethyl cellulose, wherein the composition further comprises sodium polyphosphate.

    [0011] In the lubricant composition, the purpose of the carboxymethyl cellulose is to increase the viscosity of the lubricant and the adhesion of the lubricant to the surface to be lubricated.

    [0012] In addition to inhibiting the reduction of the viscosity when the lubricant composition is in contact with iron, calcium, aluminum and/or oxygen, sodium polyphosphate also acts as a corrosion preventer.

    [0013] Theoretical pour point for a mixture of 66.7 % by weight of glycerol and 33.3 % by weight of water is -46.5°C. Using sodium polyphosphate also lowers the pour point.

    [0014] According to an embodiment the composition further comprises sodium benzoate for inhibiting activity of microorganisms. Preferably the composition comprises sodium benzoate between 0.1 to 0.3 % by weight of the composition. According to an embodiment the composition comprises sodium polyphosphate between 0.2 to 1.2 % by weight of the composition, more preferably between 0.4 to 1 % by weight of the composition.

    [0015] The composition comprises carboxymethyl cellulose between 0.1 to 0.7 % by weight of the composition, preferably between 0.1 to 0.6 % by weight of the composition.

    [0016] The composition comprises glycerol 55 to 90 % by weight of the composition, water 8.5 to 44 % by weight of the composition, and sodium polyphosphate at least 0.2 % by weight of the composition.

    [0017] The invention also relates to use of the lubricant composition of the invention as chain oil, transport chain lubricant, cutting fluid or lubricant for a test driving track. For example the lubricant composition is used as chain oil in a saw chain of stone saw, concrete saw, wood saw, or metal saw. The lubricant composition can also be used as chain oil in a handheld chain saw, or in a chain saw of forestry equipment or a forest harvester.

    [0018] The lubricant composition can also be used for lubricating transport chain in machine industry, construction industry, wood processing industry, paper industry, food industry, steel industry, car industry, agricultural industry, or in the production of isolation materials.

    [0019] When the lubricant composition is used as chain oil, preferably the composition comprises glycerol 55 to 75 % by weight of the composition, water 23 to 44 % by weight of the composition, and sodium polyphosphate 0.2 to 1.2 % by weight of the composition.

    [0020] When the lubricant composition is used as transport chain lubricant, preferably the composition comprises glycerol 60 to 68 % by weight of the composition, water 31 to 39.5 % by weight of the composition, carboxymethyl cellulose 0.25 to 0.5 % by weight of the composition, and sodium polyphosphate 0.3 to 0.5 % by weight of the composition.

    [0021] When the lubricant composition is used as cutting fluid, preferably the composition comprises glycerol 60 to 90 % by weight of the composition, water 8.4 to 39.1 % by weight of the composition, carboxymethyl cellulose 0.1 to 0.6 % by weight of the composition, and sodium polyphosphate 0.3 to 1 % by weight of the composition.

    [0022] When the lubricant composition is used as cutting fluid for drilling or threading, preferably the composition comprises glycerol 60 to 65 % by weight of the composition, water 33.5 to 39.1 % by weight of the composition, carboxymethyl cellulose 0.32 to 0.6 % by weight of the composition, and sodium polyphosphate 0.3 to 0.5 % by weight of the composition.

    [0023] When the lubricant composition is used as lubricant for a test driving track, preferably the composition comprises glycerol 60 to 70 % by weight of the composition, water 29 to 39 % by weight of the composition, carboxymethyl cellulose 0.3 to 0.7 % by weight of the composition, and sodium polyphosphate 0.3 to 0.5 % by weight of the composition.

    EXAMPLE 1



    [0024] A lubricant composition for use as chain oil comprising glycerol 66.7% by weight of the composition, water 32.35 % by weight of the composition, carboxymethyl cellulose 0.35 % by weight of the composition and sodium polyphosphate 0.4 % by weight of the composition was made.

    [0025] Pour point of the composition was measured according to ASTM D5950 as being -51 °C. Kinematic viscosity of the composition at 20 °C was measured according to ISO 3104 as being 738.1 mm2/s. Kinematic viscosity of the composition at 80 °C was measured according to ISO 3104 as being 45 mm2/s.

    EXAMPLE 2



    [0026] Two lubricant compositions were made. Composition 1 comprised glycerol 66.7 % by weight of the composition, water 32.35 % by weight of the composition, carboxymethyl cellulose 0.35 % by weight of the composition, sodium polyphosphate 0.4 % by weight of the composition and sodium benzoate 0.2 % by weight of the composition.

    [0027] Composition 2 comprised glycerol 67.0 % by weight of the composition, water 32.48 % by weight of the composition, carboxymethyl cellulose 0.35 % by weight of the composition and sodium benzoate 0.2 % by weight of the composition.

    [0028] The lubricant compositions were held in an open laboratory beaker. The viscosity of the compositions were measured after half an hour, two and half hours, 24 hours and 32 hours using Fungilab Alpha H viscometer and spindle L1. The measured viscosities are shown in Table 1.
    Table 1
      0,5 h 2,5 h 24 h 32 h
    Composition 1 1130 mm2/s 1205 mm2/s 1086 mm2/s 1086 mm2/s
    Composition 2 1102 mm2/s 1173 mm2/s 1043 mm2/s 985 mm2/s


    [0029] The results show that the viscosity change over time of Composition 1 stabilizes, whereas the viscosity of Composition 2 keeps decreasing.


    Claims

    1. A lubricant composition characterized in that the composition comprises glycerol 55 to 90 % by weight of the composition,
    water 8.5 to 44 % by weight of the composition,
    carboxymethyl cellulose 0.1 to 0.7 % by weight of the composition, and sodium polyphosphate at least 0.2 % by weight of the composition.
     
    2. Use of a lubricant composition according to claim 1 as a chain oil.
     
    3. Use according to claim 2, characterized in that the composition comprises
    glycerol 55 to 75 % by weight of the composition,
    water 23 to 44 % by weight of the composition, and
    sodium polyphosphate 0.2 to 1.2 % by weight of the composition.
     
    4. Use of a lubricant composition according to claim 1 as a transport chain lubricant.
     
    5. Use according to claim 4, characterized in that the composition comprises
    glycerol 60 to 68 % by weight of the composition,
    water 31 to 39.5 % by weight of the composition,
    carboxymethyl cellulose 0.25 to 0.5 % by weight of the composition, and sodium polyphosphate 0.3 to 0.5 % by weight of the composition.
     
    6. Use of a lubricant composition according to claim 1 as a cutting fluid.
     
    7. Use according to claim 6, characterized in that the composition comprises
    glycerol 60 to 90 % by weight of the composition,
    water 8.4 to 39.1 % by weight of the composition,
    carboxymethyl cellulose 0.1 to 0.6 % by weight of the composition, and sodium polyphosphate 0.3 to 1 % by weight of the composition.
     
    8. Use of a lubricant composition according to claim 1 as a lubricant for a test driving track.
     
    9. Use according to claim 8, characterized in that the composition comprises
    glycerol 60 to 70 % by weight of the composition,
    water 29 to 39 % by weight of the composition,
    carboxymethyl cellulose 0.3 to 0.7 % by weight of the composition, and sodium polyphosphate 0.3 to 0.5 % by weight of the composition.
     


    Ansprüche

    1. Schmiermittelzusammensetzung, dadurch gekennzeichnet, dass die Zusammensetzung umfasst:

    Glycerol 55 bis 90 Gew.-% der Zusammensetzung,

    Wasser 8,5 bis 44 Gew.-% der Zusammensetzung,

    Carboxymethylcellulose 0,1 bis 0,7 Gew.-% der Zusammensetzung, und

    Natriumpolyphosphat mindestens 0,2 Gew.-% der Zusammensetzung.


     
    2. Verwendung einer Schmiermittelzusammensetzung nach Anspruch 1 als Kettenöl.
     
    3. Verwendung nach Anspruch 2, dadurch gekennzeichnet, dass die Zusammensetzung umfasst:

    Glycerol 55 bis 75 Gew.-% der Zusammensetzung,

    Wasser 23 bis 44 Gew.-% der Zusammensetzung, und

    Natriumpolyphosphat 0,2 bis 1,2 Gew.-% der Zusammensetzung.


     
    4. Verwendung einer Schmiermittelzusammensetzung nach Anspruch 1 als Transportkettenschmiermittel.
     
    5. Verwendung nach Anspruch 4, dadurch gekennzeichnet, dass die Zusammensetzung umfasst:

    Glycerol 60 bis 68 Gew.-% der Zusammensetzung,

    Wasser 31 bis 39,5 Gew.-% der Zusammensetzung,

    Carboxymethylcellulose 0,25 bis 0,5 Gew.-% der Zusammensetzung, und

    Natriumpolyphosphat 0,3 bis 0,5 Gew.-% der Zusammensetzung.


     
    6. Verwendung einer Schmiermittelzusammensetzung nach Anspruch 1 als Schneidflüssigkeit.
     
    7. Verwendung nach Anspruch 6, dadurch gekennzeichnet, dass die Zusammensetzung umfasst:

    Glycerol 60 bis 90 Gew.-% der Zusammensetzung,

    Wasser 8,4 bis 39,1 Gew.-% der Zusammensetzung,

    Carboxymethylcellulose 0,1 bis 0,6 Gew.-% der Zusammensetzung, und

    Natriumpolyphosphat 0,3 bis 1 Gew.-% der Zusammensetzung.


     
    8. Verwendung einer Schmiermittelzusammensetzung nach Anspruch 1 als Schmiermittel für eine Testfahrstrecke.
     
    9. Verwendung nach Anspruch 8, dadurch gekennzeichnet, dass die Zusammensetzung umfasst:

    Glycerol 60 bis 70 Gew.-% der Zusammensetzung,

    Wasser 29 bis 39 Gew.-% der Zusammensetzung,

    Carboxymethylcellulose 0,3 bis 0,7 Gew.-% der Zusammensetzung, und

    Natriumpolyphosphat 0,3 bis 0,5 Gew.-% der Zusammensetzung.


     


    Revendications

    1. Composition de lubrifiant, caractérisée en ce que la composition comprend
    du glycérol constituant 55 à 90 % en poids de la composition,
    de l'eau constituant 8,5 à 44 % en poids de la composition,
    de la carboxyméthylcellulose constituant 0,1 à 0,7 % en poids de la composition, et
    du polyphosphate de sodium constituant au moins 0,2 % en poids de la composition.
     
    2. Utilisation d'une composition de lubrifiant selon la revendication 1 en tant qu'huile de chaîne.
     
    3. Utilisation selon la revendication 2, caractérisée en ce que la composition comprend
    du glycérol constituant 55 à 75 % en poids de la composition,
    de l'eau constituant 23 à 44 % en poids de la composition, et
    du polyphosphate de sodium constituant 0,2 à 1,2 % en poids de la composition.
     
    4. Utilisation d'une composition de lubrifiant selon la revendication 1 en tant que lubrifiant de chaîne de transport.
     
    5. Utilisation selon la revendication 4, caractérisée en ce que la composition comprend
    du glycérol constituant 60 à 68 % en poids de la composition,
    de l'eau constituant 31 à 39,5% en poids de la composition,
    de la carboxyméthylcellulose constituant 0,25 à 0,5 % en poids de la composition, et
    du polyphosphate de sodium constituant 0,3 à 0,5 % en poids de la composition.
     
    6. Utilisation d'une composition de lubrifiant selon la revendication 1 en tant que fluide de coupe.
     
    7. Utilisation selon la revendication 6, caractérisée en ce que la composition comprend
    du glycérol constituant 60 à 90 % en poids de la composition,
    de l'eau constituant 8,4 à 39,1% en poids de la composition,
    de la carboxyméthylcellulose constituant 0,1 à 0,6 % en poids de la composition, et
    du polyphosphate de sodium constituant 0,3 à 1 % en poids de la composition.
     
    8. Utilisation d'une composition de lubrifiant selon la revendication 1 en tant que lubrifiant pour une piste d'épreuve de conduite.
     
    9. Utilisation selon la revendication 8, caractérisée en ce que la composition comprend
    du glycérol constituant 60 à 70 % en poids de la composition,
    de l'eau constituant 29 à 39% en poids de la composition,
    de la carboxyméthylcellulose constituant 0,3 à 0,7 % en poids de la composition, et
    du polyphosphate de sodium constituant 0,3 à 0,5 % en poids de la composition.
     






    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description