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
  • 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
  • C10M129/26—Carboxylic acids; Salts thereof
  • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/24—Acids; Salts thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
  • C08K5/098—Metal salts of carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/13—Phenols; Phenolates
• • 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
  • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• • 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
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
  • C21D1/58—Oils
• • 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/02—Hydroxy compounds
  • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
  • C10M2207/028—Overbased salts thereof
• • 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
• • 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
  • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
• • 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/26—Overbased carboxylic acid salts
  • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
• • 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
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
  • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
• • 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
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
  • C10M2219/046—Overbasedsulfonic acid salts
• • 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
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/04—Groups 2 or 12
• • 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
• • 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
• • 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
  • C10N2040/20—Metal working

Definitions

• the present invention relates to a heat treatment oil composition, and more specifically, relates to a heat treatment oil composition having high cooling capability on quenching.
• a heat treatment such as quenching, is generally carried out by using a heat treatment liquid for imparting desired hardness to a metallic material. Accordingly, the heat treatment liquid necessarily has such excellent cooling capability that is capable of increasing the hardness of the metallic material.
• An oily heat treatment liquid has been frequently used as the heat treatment liquid. This is because an aqueous heat treatment liquid is extremely high in cooling capability to provide risk of quenching cracks formed in the metallic material, and causes larger quenching distortion than an oily heat treatment liquid. Accordingly, an oily heat treatment liquid, i.e., a heat treatment oil, having high cooling capability is demanded.
• a heat treatment oil is classified into a cold oil used at a low oil temperature, a hot oil used at a high oil temperature and a semi-hot oil used at an intermediate temperature.
• the cold oil corresponds to Class 1 of JIS K2242, and the semi-hot oil and the hot oil correspond to Class 2 thereof.
• the hot oil generally has a kinematic viscosity of about from 10 to 30 mm 2 /s at 100° C.
• the cold oil generally has a kinematic viscosity of about 6 mm 2 /s or less at 100° C.
• quenching distortion can be largely reduced, but due to the insufficient cooling capability, desired hardness (quenching hardness) cannot be obtained by quenching.
• a quenching oil For improving cooling capability of a heat treatment oil, such a quenching oil has been used that is improved in cooling capability by mixing asphalt, a polymer compound or an alkaline earth metal salt of sulfonic acid, salicylic acid or the like with a mineral base oil.
• the quenching oil of this kind is insufficient in cooling capability, and desired hardness may not be imparted to a metallic material.
• Patent Document 1 discloses a composition containing an oil having a specific kinematic viscosity and a specific ingredient, an aliphatic polyolefin, a hydrocarbyl-substituted phenol, an alkaline earth metal salt of salicylic acid or the like, and depending on necessity, a hydrocarbyl-substituted succinate ester and the like.
• Patent Document 2 discloses a composition containing an oil having a specific kinematic viscosity and a specific ingredient, and at least one selected from an alkali metal salt of a saligenin derivative, an aliphatic polyolefin, a hydrocarbyl-substituted phenol, an alkaline earth metal salt of salicylic acid or the like, and a hydrocarbyl-substituted succinate ester.
• these compounds contain an aliphatic polyolefin, such as polyisobutylene and the like, as an essential component, and they are insufficient in oxidation stability and are not necessarily sufficient in cooling capability.
• an object of the present invention is to provide a heat treatment oil composition having high cooling capability, and the heat treatment oil composition is excellent in cooling capability although the composition has a high flash point.
• the present invention provides:
• such a heat treatment oil composition having high cooling capability is provided that is excellent in cooling capability although the composition has a high flash point.
• the heat treatment oil composition of the present invention is obtained by mixing a base oil, (A) a metallic detergent-dispersant and (B) an aliphatic carboxylic acid having from 6 to 30 carbon atoms.
• the base oil used in the present invention is not particularly limited, and various kinds of mineral oils and synthetic oils may be used.
• the mineral oil include a paraffin mineral oil, an intermediate mineral oil, a naphthene mineral oil and the like.
• the synthetic oil that can be used include an ⁇ -olefin oligomer (an oligomerized product of an ⁇ -olefin having from 6 to 16 carbon atoms, and a hydrogenated product thereof), a (co)polymer of an olefin having 2 to 16 carbon atoms, an alkylbenzene, an alkylnaphthalene, a polyphenyl hydrocarbon, various esters, such as a fatty acid ester of a polyhydric alcohol, e.g., neopentyl glycol, trimethylolpropane, pentaerythritol and the like, a polyoxyalkylene glycol derivative, and the like.
• the base oil those having a kinematic viscosity of from 1 to 50 mm 2 /s at 100° C. are preferably used.
• the kinematic viscosity is less than 1 mm 2 /s, there are cases where it is dangerously flammable, and in the case where the kinematic viscosity exceeds 50 mm 2 /s, it is inconvenient for handling due to the high viscosity.
• the kinematic viscosity is more preferably from 1.5 to 45 mm 2 /s, and particularly preferably from 2 to 40 mm 2 /s.
• the base oil preferably has a flash point of 150° C. or more, and more preferably 170° C. or more. In the case where the flash point is 150° C. or more, there is less risk of ignition or the like, and simultaneously, oily fumes can be suppressed from being generated upon a heat treatment.
• the base oil preferably has a viscosity index of 85 or more, and more preferably 95 or more. It also preferably has an aromatic content (% C A ) of 10 or less, more preferably 7 or less, further preferably 3 or less, and particularly preferably 1 or less. In the case where the viscosity index is 85 or more and the aromatic content (% C A ) is 10 or less, the oxidation stability of the heat treatment oil composition can be favorably maintained.
• the mineral oils and synthetic oils may be used solely or after mixing two or more of them at an arbitrary ratio.
• metallic detergent-dispersant used as the component (A) of the present invention various known materials may be used without particular limitation, and preferred examples thereof include metal salts of sulfonic acid, phenol and salicylic acid.
• the sulfonic acid examples include an alkyl-substituted aromatic sulfonic acid having a molecular weight of about from 300 to 1,500, and specific examples thereof include an alkylbenzenesulfonic acid, an alkylnaphthalenesulfonic acid, a petroleum sulfonic acid and the like.
• the sulfonic acid may be thiosulfonic acid.
• Examples of the phenol include an alkylphenol and a sulfide thereof, a Mannich reaction product of an alkylphenol, and the like, and examples of the salicylic acid include an alkylsalicylic acid.
• the alkyl substituent of the sulfonic acid, the phenol and the salicylic acid is preferably a linear or branched alkyl group having from 1 to 20 carbon atoms, which may be saturated or unsaturated.
• a compound having from 1 to 7, and particularly from 1 to 4, of the substituents is preferably used.
• Examples of the metal in the metallic detergent-dispersant such as metal salts of sulfonic acid, phenol and salicylic acid, include an alkali metal and an alkaline earth metal.
• an alkaline earth metal is preferred, and for example, Ca, Ba and Mg are used with Ca and Ba being particularly preferred, from the standpoint of cooling capability.
• metal salts of sulfonic acid phenol and salicylic acid
• metal salts themselves and those having been made perbasic with a metal oxide or hydroxide and carbon dioxide are preferably used.
• neutral, basic and perbasic salts may be widely used, and for example, ones having a basic value of about from 0 to 600 mgKOH/g are used. Among these, ones having a basic value of from 50 to 400 mgKOH/g are preferred.
• the basic value referred herein is a “total basic value” measured according to the perchloric acid method defined in the item 7 of “Petroleum Products and Lubricating Oils, Neutralization Value Test Method” in JIS K2501.
• the metallic detergent-dispersant may be used solely or may be used after mixing two or more kinds thereof at an arbitrary ratio as the component (A).
• the mixing amount thereof is preferably in a range of from 0.1 to 20% by mass based on the composition. In the case where the mixing amount is less than 0.1% by mass, the cooling capability may be insufficiently improved, and in the case where it exceeds 20% by mass, the cooling capability may be deteriorated due to increased viscosity, and the advantage obtained is saturated to increase the cost. In view of the factors, the mixing amount is more preferably from 1 to 10% by mass.
• aliphatic carboxylic acid having from 6 to 30 carbon atoms as the component (B) of the present invention, a saturated or unsaturated aliphatic monocarboxylic acid and a saturated or unsaturated aliphatic dicarboxylic acid, each having a linear chain or a branched chain, are preferably used.
• aliphatic monocarboxylic acid examples include a saturated aliphatic acid, such as hexanoic acid (caproic acid), heptanoic acid, octanoic acid (caprylic acid), nonanoic acid, decanoic acid (capric acid), undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid (myristic acid), pentadecanoic acid, hexadecanoic acid (palmitic acid), heptadecanoic acid, octadecanoic acid (stearic acid), nonadecanoic acid, icosanoic acid, henicosanic acid, docosanoic acid, tricosanoic acid, tetracosanoic acid, pentacosanoic acid, hexacosanoic acid, heptacosanoic acid, octacosanoic acid,
• the aliphatic dicarboxylic acid include a saturated aliphatic dicarboxylic acid, such as octanedioic acid (suberic acid), nonanedioic acid (azelaic acid), decanedioic acid (sebacic acid), undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, hexadecanedioic acid, octadecanedioic acid, icosanedioic acid, docosanedioic acid, tetracosanedioic acid, hexacosanedioic acid, octacosanedioic acid and the like (the dicarboxylic acids may be linear or branched), an unsaturated aliphatic dicarboxylic acid corresponding to the saturated aliphatic dicarbox,
• an aliphatic monocarboxylic acid having from 8 to 20 carbon atoms is preferred from the standpoint of cooling capability, and specific examples thereof include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, linolenic acid and the like.
• the component (B) only one kind of the aliphatic carboxylic acid may be used as the component (B), and two or more of them may be used after mixing at an arbitrary ratio.
• the mixing amount thereof is preferably in a range of from 0.1 to 20% by mass based on the composition. In the case where the mixing amount is less than 0.1% by mass, the cooling capability may be insufficiently improved, and in the case where it exceeds 20% by mass, the advantage obtained may be saturated to fail to obtain advantages appropriate to the cost. In view of the factors, the mixing amount is more preferably from 1 to 10% by mass.
• the mixing ratio of the aliphatic carboxylic acid as the component (B) to the metallic detergent-dispersant as the component (A) is preferably from 0.1 to 2, and more preferably from 0.2 to 1.5, in terms of mass ratio. In the case where the mixing ratio is in the range, favorably cooling capability is obtained.
• the heat treatment oil composition of the present invention is prepared basically by mixing the base oil, the component (A) and the component (B), and depending on necessity, may be mixed with an additive that has been ordinarily used in a heat treatment oil, such as a vapor film breaking agent, a glaze improving agent, an antioxidant and the like.
• the vapor film breaking agent examples include various kinds of polyolefins, for example, an ethylene- ⁇ -olefin copolymer (where the ⁇ -olefin has from 3 to 20 carbon atoms), such as an ethylene-propylene copolymer and the like, a polymer of an ⁇ -olefin having from 5 to 20 carbon atoms, such as 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and the like, a polymer of an olefin having 3 or carbon atoms, such as polypropylene, polybutene, polyisobutylene and the like, and hydrogenated products of the polyolefins, a polymer compound, such as polymethacrylate, polymethacrylate, polystyrene, a petroleum resin and the like, asphalt, and the like.
• asphalt is preferred from the standpoint of cooling capability and stability, and an ethylene- ⁇ -olefin copolymer, such as an ethylene-propylene copolymer, polybutene and polyisobutylene are preferred from the standpoint of glaze.
• the vapor film breaking agent preferably has an average molecular weight of from 800 to 100,000. The mixing amount thereof is generally from 0.5 to 10% by mass based on the heat treating oil composition.
• glaze improving agent examples include fat and oil, a fatty acid derived from fat and oil, alkyl or alkenyl succinimide, a substituted hydroxyaromatic carboxylic acid ester derivative and the like, which have been known in the art.
• antioxidant examples include an amine antioxidant, a hindered phenol antioxidant and the like, which have been known in the art.
• the heat treatment oil composition of the present invention contains the aforementioned components, and while the properties thereof are not particularly limited, the flash point of the composition is preferably 180° C. or more, and more preferably 190° C. or more.
• the composition of the present invention further preferably has a higher flash point, such as 200° C. or more, 220° C. or more, 240° C. or more, 250° C. or more and 260° C. or more.
• the composition that has a higher flash point can be used favorably as a hot oil and a semi-hot oil used for a heat treatment at a high oil temperature.
• composition that has a flash point of 200° C. or more is classified into Petroleum Liquid Class 4 under the hazardous material classification of Japanese Fire Defense Law, and is not under the regulation of designated amount of the law, and the composition that has a flash point of 250° C. or more is classified into a designated flammable material (non-hazardous material), and is under the relaxed regulation of the law.
• the heat treatment oil composition of the present invention has excellent cooling capability even though the composition has a high flash point, for example, of 250° C. or more.
• the cooling capability referred herein can be specifically expressed as a cooling time (second) from 800° C. to 300° C. of a cooling curve of a silver test piece in JIS K2242 (which may be hereinafter referred to as “300° C. number of second”), and a shorter cooling time means good cooling capability, which shows that a quenched product having sufficient hardness is provided by quenching.
• the heat treatment oil composition of the present invention has an extremely short 300° C. number of second, and the composition classified into a hot oil or a semi-hot oil having a flash point of about 260° C. can have a cooling time of 6.0 seconds or less, and can further have a cooling time of 5.0 seconds or less or 4.0 seconds or less.
• the composition classified into a cold oil having a flash point of about 190° C. can have a 300° C. number of second of about 3.5 seconds.
• the cooling capability is significantly higher than a known heat treatment oil having a comparable flash point.
• cooling capability test defined in JIS K2242
• a prescribed silver test piece heated to 810° C. was placed into a sample (heat treatment oil), and a cooling curve of the silver test piece was measured.
• the cooling time required for cooling from 800° C. to 300° C. on the cooling curve was measured as cooling capability. A smaller number of second means higher cooling capability.
• a quenching operation was carried out under the following experimental conditions, and the quenched product was measured for hardness (quenched hardness).
• the base oils and additives shown in Table 1 were used and mixed at the ratios shown in Table 1 to prepare heat treatment oil compositions, which were measured for property and capability. The results are shown in Table 1. The quenching test was carried out for the heat treatment oil compositions of Example 6 and Comparative Example 6, and the results (quenched hardness) are shown in Table 1.
• Example 1 2 3 4 5 6 7 8 9 Mixing ratio Base oil Mineral oil 1 1) 94 93.6 93.2 93 91.72 93 88.44 93.1 96.55 (% by mass) Mineral oil 2 2) Component A Ca phenate (basic value: 255 5 5 5 5 5 5 3 1.5 mgKOH/g) Ca sulfonate (basic value: 300 mgKOH/g) Ca sulfonate (basic value: 80 mgKOH/g) Ba sulfonate (basic value: 150 mgKOH/g) Component B Caprylic acid 1 Lauric acid 1.4 Palmitic acid 1.8 Stearic acid 2 3.28 Isostearic acid 2 6.56 3.9 1.95 Oleic acid Linoleic acid Others Vapor film breaking agent 3) Performance Flash point (° C.) 265 265 260 260 260 265 260 260 265 Characteristic number of second 2.5 2.1 1.9 2.0 2.4 2.1 2.9 2.5 2.3 Quenching capability (300° C.
• the heat treatment oil compositions that do not contain one or both of the components (A) and (B) of the present invention (Comparative Examples 1 to 3) and the heat treatment oil composition containing the vapor film breaking agent instead of the components (A) and (B) of Comparative Example 4 have a 300° C. number of second of 9.4 seconds or more, which shows deteriorated cooling performance.
• the commercially available heat treatment oil (Comparative Example 6) having a flash point of about 250° C. has a 300° C. number of second of 7.5 seconds and is deteriorated in cooling capability as compared to the heat treatment oil of the present invention having a flash point of about 260° C.
• the quenched hardness in the quenching test with the heat treatment oil of the present invention (Example 6, 300° C. number of second of 5.0 second) and the commercially available heat treatment oil (Comparative Example 6, 300° C. number of second of 7.5 seconds) is 476 Hv for the former and 420 Hv for the later, and thus the difference in quenching performance between the present invention and the comparative example can be clearly comprehended.
• the heat treatment oil composition having a flash point of about 190° C. corresponding to a cold oil has a 300° C. number of second of 3.5 seconds and is markedly excellent in cooling performance as compared to the heat treatment oil of Comparative Example 5 having similarly a flash point of about 190° C. and containing the vapor film breaking agent instead of the components (A) and (B) (300° C. number of second of 5.1 seconds).
• such a heat treatment oil composition that has high cooling capability and is excellent in cooling capability although the composition has a high flash point. Therefore, in the case where a quenching operation is carried out with a so-called hot oil or semi-hot oil for reducing quenching distortion, it can be advantageously utilized as a heat treatment oil having necessary cooling capability.

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• 2007
  • 2007-07-27 JP JP2007196055A patent/JP5253772B2/ja not_active Expired - Fee Related
• 2008
  • 2008-07-11 US US12/670,210 patent/US20100186853A1/en not_active Abandoned
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  • 2008-07-11 WO PCT/JP2008/062596 patent/WO2009016942A1/ja active Application Filing
  • 2008-07-11 CN CN2008801005043A patent/CN101765640B/zh not_active Expired - Fee Related
  • 2008-07-24 TW TW097128189A patent/TWI454534B/zh not_active IP Right Cessation

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