CN1288228C - Lubricating oil compound for freezer - Google Patents

Lubricating oil compound for freezer Download PDF

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Publication number
CN1288228C
CN1288228C CNB021406898A CN02140689A CN1288228C CN 1288228 C CN1288228 C CN 1288228C CN B021406898 A CNB021406898 A CN B021406898A CN 02140689 A CN02140689 A CN 02140689A CN 1288228 C CN1288228 C CN 1288228C
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Prior art keywords
lubricating oil
ester
acid
oil composition
weight
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CN1396246A (en
Inventor
开米贵
高桥仁
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Eneos Corp
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Japan Energy Corp
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    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/68—Esters
    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/16—Ethers
    • 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
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/008—Lubricant compositions compatible with refrigerants
    • 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
    • C10M2290/00—Mixtures of base materials or thickeners or additives
    • C10M2290/04—Synthetic base oils
    • 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
    • C10N2040/30—Refrigerators lubricants or compressors lubricants

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

Abstract

To provide a lubricating oil composition for a refrigerating machine, excellent in stability to hydrolysis and oxidation, scarcely causing color development of a lubricating oil nor generating sludge when used for a long period, and suitable for the refrigerating machine for which a refrigerant free from chlorine, such as a hydrofluorocarbon, carbon dioxide or a hydrocarbon, is used. This lubricating oil composition for the refrigerating machine for which the hydrofluorocarbon, the carbon dioxide or the hydrocarbon is used as the refrigerant is given by adding (A) at least one kind of compound which contains an alkyl glycidyl ether, alkyl glycidyl ester or cyclohexane oxide in its molecule in an amount of not less than 0.01 wt.% but less than 1 wt.% and (B) at least one kind of diphenylcarbodiimide and a bis(alkylated phenyl)carbodiimide compound in an amount of not less than 0.01 wt.% but less than 1 wt.% to an ester-based or ether-based synthetic lubricating base oil.

Description

Lubricating oil composition of freezer
Technical field
The present invention relates to use the lubricating oil composition of freezer of not chloride cooling agent such as hydrofluoric ether, carbonic acid gas, hydrocarbon.
Background technology
In refrigerators such as refrigerator, air-conditioning plant, deadlocked etc. for the friction, abrasion, the heating that prevent to compress sliding part, use lubricating oil.The desired characteristic of this lubricating oil for example has: owing to can follow and the contacting of cooling agent, therefore, need the excellent in stability to cooling agent; With solvability excellence of cooling agent etc.In the past, using chloride fluorine was cooling agent, for example, and trichlorofluoromethane (R11), Refrigerant 12 cfcs such as (R12), chlorodifluoromethane fluorine hydrochloric ethers such as (R22).For these chloride cooling agent, be that synthetic oil (PAO) etc. is as lubricating oil with naphthene series mineral oil, paraffin series mineral oil, alkyl benzene series synthetic oil, poly-alpha olefins always.
But, because these fluorine-containing fluorine are that cold cooling agent can damage the ozone layer, therefore, in the world, its use is restricted, and fluorine as an alternative is a cooling agent, is using 1 at present, 1,1, not chloride hydrofluoric ether such as 2-Tetrafluoroethane (R134a), ammonia, carbonic acid gas, hydrocarbon etc.Also the someone has studied the lubricating oil corresponding with these cooling agent, proposing with polyoxyalkylene glycol polyethers such as (PAG) is that synthetic oil or polyol ester are that synthetic oil is corresponding to fluoro hydrocarbon system cooling agent, with ethers such as PAG be synthetic hydrocarbon compounds such as synthetic oil or PAO corresponding to carbonic acid gas, be that synthetic oil, naphthene series mineral oil, paraffin series mineral oil are corresponding to hydrocarbon system cooling agent with ether.
But, because not chloride cooling agent can not produce the extreme pressure effect (oilness raising) of chlorine, therefore, cause the bearing, piston, sealing etc. of refrigerator lubricated not good easily, produce that energy loss, friction increase, heating is deadlocked etc., become the decomposition that promotes cooling agent and lubricating oil, cause reason for corrosion.Especially in the refrigeration systems such as compressor of refrigerator, have micro-moisture and oxygen, when the use polyol ester is lubricating oil, can hydrolysis and generate free acid; When using ether to be lubricating oil, can oxidative degradation, acid number is risen, these all can cause in the device material corrosion, promote cooling agent, lubricating oil deterioration, the generation of the non-solvent components of cooling agent can cause kapillary obstruction etc.
In order to improve above-mentioned situation, the method that the open communique of Japan special permission nineteen ninety has proposed to add epoxy compounds No. 276880 and 1993 No. 17792, the open communique of Japan's special permission nineteen ninety-five No. 133487, International Patent Application WO 94/21759 have proposed the method that interpolation contains the compound of carbodiimide group.Yet, the sluggish of epoxy compounds and free acid, and the compound that contains carbodiimide group will produce substantial effect separately, its addition must be big.Particularly do not reduce the refrigerator such as automative air conditioning, air-conditioning plant of the device of moisture or means in the refrigeration system, the addition that contains the compound of carbodiimide group must be more than 2 weight %.When using carbodiimide, such addition can make lubricating oil significantly painted, cause its commodity value to descend.And, the problem that all has the dregs of fat to generate behind epoxy compounds and the carbodiimide compound life-time service.
For addressing the above problem, the present inventor has carried out deep research, found that, when epoxy compounds and carbodiimide compound are share, surprisingly, compare when they are added separately respectively, can significantly reduce the addition of these compounds, and the dregs of fat that can suppress the painted of lubricating oil and produce because of life-time service.
Based on above-mentioned discovery, the objective of the invention is, provide a kind of to using the optimal lubricating oil composition of refrigerator of not chloride cooling agent such as hydrofluoric ether, carbonic acid gas or hydrocarbon, it is to the excellent in stability of hydrolysis and oxidation, can be not painted, and life-time service can not produce the dregs of fat.
Summary of the invention
The present invention relates to
(1) a kind of being used for hydrofluoric ether, carbonic acid gas or the hydrocarbon lubricating oil composition as the refrigerator of cooling agent, its formation is to have mixed in the synthetic lubricating base oil of ester system or ether system
(A) more than one in above, the compound that contains cyclohexene oxide less than alkyl glycidyl base ether, paraffinic acid glycidyl esters or the intramolecularly of 1 weight % of 0.01 weight % and
(B) 0.01 weight % above, less than in phenylbenzene carbodiimide or two (alkylation phenyl) carbodiimide compound of 1 weight % more than one;
(2) a kind of being used for hydrofluoric ether, carbonic acid gas or the hydrocarbon lubricating oil composition as the refrigerator of cooling agent, its formation is to have mixed in the synthetic lubricating base oil of ester system or ether system
(A) more than one in above, the compound that contains cyclohexene oxide less than alkyl glycidyl base ether, paraffinic acid glycidyl esters or the intramolecularly of 1 weight % of 0.01 weight % and
(B) 0.01 weight % above, less than in phenylbenzene carbodiimide or two (alkylation phenyl) carbodiimide compound of 1 weight % more than one and
(C) 0.01 weight % above, less than the ditertbutylparacresol of 1 weight %;
(3) lubricating oil composition of freezer of above-mentioned (1) or (2) record, wherein, described with hydrofluoric ether, carbonic acid gas or hydrocarbon be the refrigerator of cooling agent do not reduce this refrigerator be in the device or the means of moisture;
(4) lubricating oil composition of freezer of above-mentioned (1) to (3) record, wherein, the synthetic lubricating base oil of described ester system is a polyol ester;
(5) lubricating oil composition of freezer of above-mentioned (1) to (3) record, wherein, the synthetic lubricating base oil of described ester system is a mixed ester;
(6) lubricating oil composition of freezer of above-mentioned (4) record, wherein, described polyol ester is by tetramethylolmethane, neopentyl glycol, TriMethylolPropane(TMP) or Dipentaerythritol and unary fatty acid synthetic ester;
(7) lubricating oil composition of freezer of above-mentioned (4) or (6) record, wherein, described polyol ester is the ester of the mixture of tetramethylolmethane and the unary fatty acid more than two kinds.
Epoxy compounds and carbodiimide compound all have the corrosive compound reaction interior with refrigerators such as moisture, lipid acid, oxidative degradation things, prevent that corrosion composition from causing the material degradation in the refrigerator and preventing that corrosion composition from promoting the effect of cooling agent and lubricating oil deterioration etc.
Being swift in response of carbodiimide compound and moisture, lipid acid, oxidative degradation thing, can and refining after residue in initial stage reaction of moisture in lipid acid, oxidative degradation thing and the rerigerator in the lubricating oil.
On the other hand, the reaction of epoxy compounds is slower, corrosion composition reactions such as the lipid acid that the thermal load in the time of can working with refrigerator, slipper produce, oxidative degradation thing.
With two compounds and usefulness, then above-mentioned effect is multiplied each other, and makes their addition reduce.
In addition,, also add ditertbutylparacresol, the effect of above-mentioned effect is increased if with two compounds.
Embodiment
The present invention is particularly suitable for not reducing in the refrigeration systems such as automative air conditioning, air-conditioning plant the device of moisture in the system or the refrigerator of means applicable to the refrigerator that uses cooling agent such as hydrofluoric ether, carbonic acid gas, hydrocarbon.Also applicable to the mixture of these not chloride cooling agent.
The example of hydrofluoric ether has 1,1,1,2-Tetrafluoroethane (R134a), 1,1,1-Halothane (R143a), pentafluoride ethane (R125), methylene fluoride cooling agent such as (R32) or their mixture etc.
Hydrocarbon system cooling agent for example can be the hydrocarbon compound of 1-6 carbon atom.Its object lesson has compounds such as methane, ethane, propane, normal butane, Trimethylmethane, Skellysolve A, iso-pentane, neopentane, cyclopropane, tetramethylene, pentamethylene.These compounds can use separately, also can use after the appropriate combination more than two kinds.
The base oil of refrigerator oil of the present invention is more than one ester cpds, ether compound preferably.
Ester cpds is preferably by polyvalent alcohol and monocarboxylic esterification and polyol ester, polyvalent alcohol and the monocarboxylic acid that obtains, the mixed ester of polycarboxylic acid or their mixture etc.Polyvalent alcohol is good with amyl-based polyols such as neopentyl glycol, TriMethylolPropane(TMP), tetramethylolmethane, Dipentaerythritols especially.Monocarboxylic acid for example has positive valeric acid, n-caproic acid, positive enanthic acid, n-caprylic acid, pelargonic acid, n-capric acid, isovaleric acid, isocaproic acid, isoamyl acetic acid, 2-ethyl valeric acid, 2 methyl caproic acid, isocaprylic acid, 2 ethyl hexanoic acid, different n-nonanoic acid, 3,5,5-tri-methyl hexanoic acid, isodecyl acid etc.In addition, polycarboxylic acid dicarboxylic acid such as propanedioic acid, Succinic Acid, pentanedioic acid, hexanodioic acid, pimelic acid, suberic acid, nonane diacid preferably.
The example of ether compound has a lot.Its representational example has the polyether compound of following general formula (1) expression:
X[-O-(AO) n-R 1]m (1)
In the formula,
X: remove the alkyl of the form of hydroxyl from monohydroxy-alcohol or polyvalent alcohol
The alkylidene group of A:2-4 carbon atom
R 1: the alkyl of a hydrogen or 1-10 carbon atom
The valence mumber of m:X
The positive number that n:2 is above.
Wherein, (AO) nAdd up to n group by what in oxygen ethylidene, oxygen propylidene or the oxygen butylidene one or more were formed, above-mentioned oxyalkylene can be with desirable series arrangement.
Base oil can be one or two or more kinds the appropriate combination in the above-mentioned synthetic oil.
Lubricating oil composition of the present invention can by in above-mentioned base oil, add following (A) and (B) composition and again the additive of interpolation (C) composition made.Optionally, also can add additive (D).
(A) contain the compound of selecting the compound of cyclohexene oxide from alkyl glycidyl base ether, paraffinic acid glycidyl esters or intramolecularly
(A1) alkyl glycidyl base ether
Alkyl glycidyl base ether is represented with following general formula (2).
Figure C0214068900071
In the formula (2), R 2The alkyl of 5-18 carbon atom of expression.
If the carbonatoms of alkyl is less than 5, then the stability decreases of epoxy compounds can be decomposed before reacting with moisture, lipid acid, oxidative degradation thing, perhaps, the self-polymerization of meeting between the epoxy compounds, thus can't play due function.And if carbonatoms is greater than 18, then and the solvability between the cooling agent (especially hydrofluoric ether cooling agent) disappear, can in refrigeration plant, separate out, cause that cooling is bad etc., also be unfavorable therefore.
In addition, if formula (2) compound contains phenyl, aryl etc., then the solvability between itself and the cooling agent also can disappear, and separates out in refrigeration plant, causes that cooling is bad etc., also is unfavorable therefore.
Its object lesson has amyl group glycidyl ether, hexyl glycidyl ether, octyl group glycidyl ether, 2-ethylhexyl glycidyl ether, nonyl glycidyl ether, decyl glycidyl ether, new decyl glycidyl ether, lauryl glycidyl ether, new lauryl glycidyl ether, palmityl glycidyl ether, stearyl glycidyl ether etc.
(A2) paraffinic acid glycidyl esters
The paraffinic acid glycidyl esters is represented with following general formula (3).
Figure C0214068900072
In the formula (3), R 3The alkyl of 5-18 carbon atom of expression.
If the carbonatoms of alkyl is less than 5, then the stability decreases of epoxy compounds can be decomposed before reacting with moisture, lipid acid, oxidative degradation thing, perhaps, the self-polymerization of meeting between the epoxy compounds, thus can't play due function.And if carbonatoms is greater than 18, then and the solvability between the cooling agent (especially hydrofluoric ether cooling agent) disappear, can in refrigeration plant, separate out, cause that cooling is bad etc., also be unfavorable therefore.
In addition, if formula (3) compound contains phenyl, aryl etc., then the solvability between itself and the cooling agent also can disappear, and separates out in refrigeration plant, causes that cooling is bad etc., also is unfavorable therefore.
Its object lesson has valeric acid glycidyl esters, caproic acid glycidyl esters, sad glycidyl esters, 2 ethyl hexanoic acid glycidyl esters, n-nonanoic acid glycidyl esters, capric acid glycidyl esters, neodecanoic acid glycidyl esters, lauric acid glycidyl esters, new lauric acid glycidyl esters, palmitinic acid glycidyl esters, stearic acid glycidyl esters etc.
(A3) intramolecularly contains the compound of cyclohexene oxide
The compound that intramolecularly contains cyclohexene oxide is represented with following general formula (4).
In the above-mentioned formula (4), R4 represent the alkyl of hydrogen or 1-30 carbon atom or alkenyl, phenyl, alkylation phenyl or following general formula (5) expression oxyalkylene,
Figure C0214068900082
In the formula (5), A represents the alkylidene group of 1-4 carbon atom, n be the following general formula of the integer of 1-10 (6) expression the group that contains polyester,
In the formula (6), B represents the alkylidene group of 1-9 carbon atom, and m is the integer of 0-10 or the group that contains carbonyl of following general formula (7) expression
Figure C0214068900084
In the formula (7), R 5The alkyl of expression hydrogen or 1-20 carbon atom, p is the integer of 0-20.
Its object lesson has cyclohexene oxide, epoxidation tetrahydrochysene benzylalcohol, lactone modified epoxy tetrahydrochysene benzylalcohol, vinyl cyclohexene monoxide etc.Especially be good with epoxidation tetrahydrochysene benzylalcohol.
In addition, also can use at least a above polycondensate or the dehydration condensation of structure shown in the above-mentioned general formula.
Above-mentioned more than one compounds that are selected from the compound that alkyl glycidyl base ether, paraffinic acid glycidyl esters or intramolecularly contain cyclohexene oxide are more than the 0.01 weight %, less than 1 weight % with respect to the addition of base oil, to be good more than the 0.05 weight %, less than 1 weight %, 0.1 weight % is above, better less than 1 weight %.If addition is too little, then there is not effect, and if excessive, epoxy compounds oneself polymerization can appear during life-time service then, and cause the dregs of fat to produce, be unfavorable therefore.(B) phenylbenzene carbodiimide or two (alkyl phenyl) carbodiimide
The example of two (alkyl phenyl) carbodiimide that can use in the present invention has xylyl carbodiimide, two (isopropyl phenyl) carbodiimide, two (diisopropyl phenyl) carbodiimide, two (triisopropyl phenyl) carbodiimide, two (butyl phenyl) carbodiimides, two (dibutyl phenyl) carbodiimide, two (nonyl phenyl) carbodiimide etc.
Carbodiimide compound is more than the 0.01 weight %, less than 1 weight % with respect to the addition of base oil, being good more than the 0.05 weight %, less than 0.5 weight %.If addition is too little, then there is not effect, and if excessive, then lubricating oil can become dark brownly from yellow, and commodity value descends, and life-time service has the dregs of fat and generates, and is unfavorable therefore.
(C) ditertbutylparacresol
Ditertbutylparacresol is more than the 0.01 weight %, less than 1 weight % with respect to the addition of base oil, being good more than the 0.05 weight %, less than 0.5 weight %.If addition is too little, then do not have effect, and if excessive, then life-time service has dregs of fat generation, is unfavorable therefore.
(D) other additive
In the present invention, giving over-all properties, do not influencing in the scope of lubricating oil composition characteristic and can suitably add following known additive.In lubricating oil composition of the present invention, also can mix following additives.
Anti-abrasion agent: Sulfur system, phosphorus system, thiophosphoric acid zinc system etc.
Antioxidant: phenol system, amine system, phosphorus system etc.
Rust-preventive agent: benzotriazole (derivative), thiadiazoles, dithiocar-bamate etc.
Acid trapping agent: the epoxy compounds beyond above-mentioned, above-mentioned carbodiimide compound in addition etc.
Oiliness improver: higher fatty acid class, alcohol etc.
Defoamer: silicone oil etc.
Other known lubricating oil additive.
Lubricating oil composition of the present invention can be used for refrigerators such as the automative air conditioning, air conditioning machinery, dehumidifier, refrigerator, freezer, freezing-cooling storeroom, vending machine, shopper window, chemical industry equipment of reciprocating type or rotary compressor.Especially its refrigeration cycle constitutes, does not reduce the device such as moisture eliminator of the moisture in this refrigeration cycle system or the refrigerator of means by compressor, expansion mechanism, vaporizer and condenser or gas cooler at least, can bring into play the effect of lubricating oil of the present invention to greatest extent, very suitable.
Describe below in conjunction with embodiment and comparative example, but the invention is not restricted to these embodiment.The base oil, the additive that use in embodiment and comparative example are as follows.Base oil:
Base oil 1: the polyol ester that obtains by tetramethylolmethane and 2 ethyl hexanoic acid/3,5,5 Trimethylhexanoic acid (50 weight %/50 weight %)
Base oil 2: the polyol ester that obtains by tetramethylolmethane and 2 ethyl hexanoic acid
Base oil 3: the polyol ester additive that obtains by neopentyl glycol and 2 ethyl hexanoic acid:
(1) epoxy compounds:
A1:2-ethylhexyl glycidyl ether
A2: neodecanoic acid glycidyl esters
A3: cyclohexene oxide alcohol cyclohexene oxide carboxylicesters
(2) carbodiimide compound (CDI):
B1: two (dibutyl phenyl) carbodiimide
(3) ditertbutylparacresol (DBPC)
The composition of the lubricating oil composition of embodiment and comparative example is shown in table 1.
Table 1
Base oil Epoxy compounds CDI DBPC
1 2 3 A1 A2 A3 B1
Embodiment 1 100 0.05 0.05 0.1
Embodiment 2 100 0.25 0.05
Embodiment 3 100 0.25 0.05 0.1
Embodiment 4 100 0.5 0.05
Embodiment 5 100 0.5 0.05 0.1
Embodiment 6 100 0.9 0.01 0.1
Embodiment 7 100 0.25 0.05 0.1
Embodiment 8 100 0.25 0.05 0.1
Embodiment 9 50 50 0.5 0.1 0.1
Embodiment 10 50 50 0.5 0.1 0.1
Embodiment 11 50 50 0.5 0.1 0.1
Comparative example 1 100 0.5 0.1
Comparative example 2 100 1.0 0.1
Comparative example 3 100 2.0 0.1
Comparative example 4 100 2.0 2.0 0.1
Comparative example 5 100 2.0 0.1
Comparative example 6 100 2.0 0.1
Comparative example 7 100 1.0 0.1
Comparative example 8 100 2.0 0.1
Comparative example 9 100 6.0 0.1
Comparative example 10 100 6.0 0.1
Comparative example 11 50 50 1.0 0.1
Comparative example 12 50 50 1.0 0.1
Under the following conditions, estimate the stability of the lubricating oil composition of these embodiment and comparative example by sealed tube test to hydrolysis and oxidative degradation.
Sealed tube test (stability confirmation):
Test conditions: JIS K2211 is with reference to appendix 2
Water content in oil: 1000ppm
Lubricating oil/R134a=7mL/3mL
Catalyzer: Fe, Cu, Al
Aging condition: 1) 175 ℃ * 14 days
2) 200 ℃ * 14 days
Observe color sample after aging, have or not and separate out, measure total acid value.The above-mentioned test-results of the lubricating oil composition of embodiment and comparative example is shown in table 2.
Table 2
175 ℃ * 14 days 200 ℃ * 14 days
Color ASTM Total acid value mgKOH/g Separate out Color ASTM Total acid value mgKOH/g Separate out
Embodiment 1 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 2 L0.5 0.01 Do not have L0.5 0.02 Do not have
Embodiment 3 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 4 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 5 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 6 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 7 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 8 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 9 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 10 L0.5 0.01 Do not have L0.5 0.01 Do not have
Embodiment 11 LO.5 0.01 Do not have L0.5 0.01 Do not have
Comparative example 1 L0.5 0.04 Do not have L1.0 0.78 Do not have
Comparative example 2 L0.5 0.03 Do not have L1.0 0.52 Do not have
Comparative example 3 L0.5 0.02 Do not have L1.0 0.31 Have
Comparative example 4 L1.5 0.01 Have L2.5 0.01 Have
Comparative example 5 L1.0 0.03 Do not have L1.0 0.36 Have
Comparative example 6 L0.5 0.02 Do not have L1.0 0.27 Have
Comparative example 7 L1.5 0.03 Do not have L2.0 0.39 Have
Comparative example 8 L2.5 0.02 Have L3.5 0.23 Have
Comparative example 9 L1.0 0.02 Have L1.0 0.26 Have
Comparative example 10 L3.5 0.01 Have L5.0 0.16 Have
Comparative example 11 L0.5 0.03 Do not have L0.5 0.40 Do not have
Comparative example 12 L2.0 0.03 Do not have L2.0 0.36 Do not have
By above result as can be known, as embodiment, the lubricating oil composition that has added the lubricating oil composition of epoxy compounds and carbodiimide compound and added ditertbutylparacresol again has excellent stability.
In addition, under the following conditions the lubricating oil composition of embodiment 2,7,8 and comparative example 2,4,7 has been carried out being equivalent to the compressor long duration test of real machine test.
The compressor long duration test:
Test conditions: 1HP, rotary compressor
Water content in oil: 1000ppm
Cooling agent: R407C
Pressure: 31kg/cm spues 2
Suck and press: 6kg/cm 2
Test period: 1000 hours
Refrigeration cycle uses the circulation that constitutes, do not contain moisture eliminator by compressor, condenser, expansion valve (needle-valve), vaporizer to test.
The above-mentioned test-results of the lubricating oil composition of embodiment and comparative example is shown in table 3.
Table 3
Color: ASTM Total acid value: mgKOH/g Separate out
Embodiment 2 L1.0 0.03 Do not have
Embodiment 7 L1.0 0.02 Do not have
Embodiment 8 L1.0 0.01 Do not have
Comparative example 2 L2.0 0.21 Do not have
Comparative example 4 L5.5 0.04 Have
Comparative example 7 L6.0 0.05 Have
By above result as can be known, as embodiment, the lubricating oil composition that has added the lubricating oil composition of epoxy compounds and carbodiimide compound and added ditertbutylparacresol again has excellent stability.
Lubricating oil composition of freezer with specific epoxy compounds and carbodiimide compound and usefulness of the present invention is to the excellent in stability of hydrolysis and oxidation, can be not painted, life-time service does not have the dregs of fat yet and generates, the burn into cooling agent that being subjected to material in the hydrolysis resultant, the promoted device of oxidative degradation thing and the deterioration of lubricating oil can be reduced, and kapillary obturation that the non-solvent components by cooling agent causes etc. can be reduced.

Claims (7)

1. one kind is used for hydrofluoric ether, carbonic acid gas or the hydrocarbon lubricating oil composition as the refrigerator of cooling agent, and its formation is to have mixed in the synthetic lubricating base oil of ester system
(A) more than one in above, the compound that contains cyclohexene oxide less than alkyl glycidyl base ether, paraffinic acid glycidyl esters or the intramolecularly of 1 weight % of 0.01 weight % and
(B) 0.01 weight % above, less than in phenylbenzene carbodiimide or two (alkylation phenyl) carbodiimide compound of 1 weight % more than one.
2. lubricating oil composition of freezer as claimed in claim 1 wherein, has also mixed in the synthetic lubricating base oil of ester system more than (C) 0.01 weight %, less than the ditertbutylparacresol of 1 weight %.
3. lubricating oil composition of freezer as claimed in claim 1 or 2, wherein, described with hydrofluoric ether, carbonic acid gas or hydrocarbon be the refrigerator of cooling agent do not reduce this refrigerator be in the device or the means of moisture.
4. as each described lubricating oil composition of freezer among the claim 1-3, wherein, the synthetic lubricating base oil of described ester system is a polyol ester.
5. as each described lubricating oil composition of freezer among the claim 1-3, wherein, the synthetic lubricating base oil of described ester system is a mixed ester.
6. lubricating oil composition of freezer as claimed in claim 4, wherein, described polyol ester is by tetramethylolmethane, neopentyl glycol, TriMethylolPropane(TMP) and/or Dipentaerythritol and unary fatty acid synthetic ester.
7. as claim 4 or 6 described lubricating oil composition of freezer, wherein, described polyol ester is the ester of the mixture of tetramethylolmethane and the unary fatty acid more than two kinds.
CNB021406898A 2001-07-09 2002-07-09 Lubricating oil compound for freezer Expired - Lifetime CN1288228C (en)

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