JP2010215696A - Industrial operating fluid composition - Google Patents
Industrial operating fluid composition Download PDFInfo
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- JP2010215696A JP2010215696A JP2009060974A JP2009060974A JP2010215696A JP 2010215696 A JP2010215696 A JP 2010215696A JP 2009060974 A JP2009060974 A JP 2009060974A JP 2009060974 A JP2009060974 A JP 2009060974A JP 2010215696 A JP2010215696 A JP 2010215696A
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- 239000000203 mixture Substances 0.000 title claims abstract description 55
- 239000012530 fluid Substances 0.000 title claims abstract description 15
- 239000002199 base oil Substances 0.000 claims abstract description 44
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 15
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 15
- 239000010720 hydraulic oil Substances 0.000 claims description 46
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 18
- 230000001050 lubricating effect Effects 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 abstract description 11
- 238000010008 shearing Methods 0.000 abstract description 7
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000000314 lubricant Substances 0.000 abstract 1
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 22
- 239000003921 oil Substances 0.000 description 18
- -1 phosphate ester Chemical class 0.000 description 16
- 230000000694 effects Effects 0.000 description 15
- 229920000642 polymer Polymers 0.000 description 13
- 229920013639 polyalphaolefin Polymers 0.000 description 12
- 238000002156 mixing Methods 0.000 description 11
- 239000000178 monomer Substances 0.000 description 11
- 238000010998 test method Methods 0.000 description 11
- 239000000654 additive Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 150000001993 dienes Chemical class 0.000 description 10
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- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
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- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical class C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- NAGJZTKCGNOGPW-UHFFFAOYSA-N dithiophosphoric acid Chemical class OP(O)(S)=S NAGJZTKCGNOGPW-UHFFFAOYSA-N 0.000 description 2
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical class O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 2
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
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- DTCCVIYSGXONHU-CJHDCQNGSA-N (z)-2-(2-phenylethenyl)but-2-enedioic acid Chemical compound OC(=O)\C=C(C(O)=O)\C=CC1=CC=CC=C1 DTCCVIYSGXONHU-CJHDCQNGSA-N 0.000 description 1
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 description 1
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- VXYZJPYTBLPGST-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;2-methylbuta-1,3-diene Chemical compound CC(=C)C=C.C=CC1=CC=CC=C1C=C VXYZJPYTBLPGST-UHFFFAOYSA-N 0.000 description 1
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- OSSNTDFYBPYIEC-UHFFFAOYSA-N 1-ethenylimidazole Chemical compound C=CN1C=CN=C1 OSSNTDFYBPYIEC-UHFFFAOYSA-N 0.000 description 1
- RCJMVGJKROQDCB-UHFFFAOYSA-N 2-methylpenta-1,3-diene Chemical compound CC=CC(C)=C RCJMVGJKROQDCB-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- OAOZZYBUAWEDRA-UHFFFAOYSA-N 3,4-dimethylidenehexane Chemical compound CCC(=C)C(=C)CC OAOZZYBUAWEDRA-UHFFFAOYSA-N 0.000 description 1
- IGLWCQMNTGCUBB-UHFFFAOYSA-N 3-methylidenepent-1-ene Chemical compound CCC(=C)C=C IGLWCQMNTGCUBB-UHFFFAOYSA-N 0.000 description 1
- BOGRNZQRTNVZCZ-UHFFFAOYSA-N 3-methylpenta-1,3-diene Chemical compound CC=C(C)C=C BOGRNZQRTNVZCZ-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Natural products OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical class C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- MPMBRWOOISTHJV-UHFFFAOYSA-N but-1-enylbenzene Chemical compound CCC=CC1=CC=CC=C1 MPMBRWOOISTHJV-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 239000012990 dithiocarbamate Substances 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
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- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
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- 125000002524 organometallic group Chemical group 0.000 description 1
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- Lubricants (AREA)
Abstract
Description
本発明は、省電力型工業用作動油組成物に関する。 The present invention relates to a power-saving industrial hydraulic oil composition.
近年、地球規模での温暖化が進行し、温室効果ガスの一つである二酸化炭素排出量削減が急務となっている。わが国でも、２００６年にエネルギーの使用の合理化に関する法律、地球温暖化対策の推進に関する法律がそれぞれ改正施行され、工場、輸送事業者等はこれまで以上に電力消費量の削減が求められるようになってきた。 In recent years, global warming has progressed, and there is an urgent need to reduce carbon dioxide emissions, which is one of the greenhouse gases. In Japan, the Law Concerning the Rational Use of Energy and the Law Concerning Promotion of Global Warming Countermeasures were revised and implemented in 2006, and factories and transportation companies have been required to reduce power consumption more than ever. I came.
電力消費量削減の一つの方法として、産業機械や輸送機械で使用される潤滑油側からの省電力化が図られている。
省電力化の有効な手段として、動粘度を低くすることが広く知られているが、一方で、特定の添加剤を配合することによる摩擦・摩耗の低減による向上が図られている。例えば、リン酸エステル、リン酸エステルのアミン塩、脂肪酸エステル、カルボン酸アミド、硫化オキシモリブデンジチオホスフェート、硫化オキシモリブデンジチオカーバメートなどの配合技術による対応が試みられている（例えば、特許文献１、２参照）。また、特定の基油を使用することにより、配管等の圧力損失の低減を図った例も挙げられる（特許文献３参照）。
As one method of reducing power consumption, power saving from the lubricating oil side used in industrial machines and transportation machines is being attempted.
As an effective means for power saving, it is widely known that the kinematic viscosity is lowered, but on the other hand, improvement by reducing friction and wear by blending a specific additive has been achieved. For example, attempts have been made to cope with blending techniques such as phosphate ester, amine salt of phosphate ester, fatty acid ester, carboxylic acid amide, sulfurized oxymolybdenum dithiophosphate, sulfurized oxymolybdenum dithiocarbamate (for example, Patent Documents 1 and 2). reference). Moreover, the example which aimed at reduction of pressure loss, such as piping, by using specific base oil is also mentioned (refer patent document 3).
ところで、油圧装置においても省電力化が求められている。最近では油圧装置の高出力化、高圧化、オイルタンクの小型化などにより、高温、高圧、高せん断等、作動油がより過酷な条件にさらされる傾向にある。 By the way, power saving is also demanded in the hydraulic device. Recently, hydraulic oil tends to be exposed to harsher conditions such as high temperature, high pressure, high shear, etc. due to higher output, higher pressure, and smaller oil tanks.
工業用油圧装置は、オイルタンク、ベーンポンプやピストンポンプなどの油圧ポンプ、流量、方向、圧力を調整するための制御弁、油圧シリンダーや油圧ポンプなどのアクチュエーター、それらをつなぐ配管から構成される。これらの各部位の内、油圧ポンプ、制御弁、アクチュエーターにおいて、作動油は狭い経路を流れることとなり、高せん断条件にさらされる。油圧ポンプ、制御弁、アクチュエーターといった、油圧装置を構成するメインの部位での粘度を低くすることは、油圧装置の省電力化の方法の一つとして有効であると考えられ、動粘度だけではなく、高せん断条件下での一時せん断粘度（以下、「高せん断粘度」ということもある）を低くすることは、油圧装置の省電力化によりいっそう寄与することが期待できる。
例えば、射出成形機のように通常タンク油温４０℃前後にて運転される油圧装置では、４０℃における高せん断粘度を低くすることで、省電力化に寄与できることが期待できる。
Industrial hydraulic devices are composed of oil tanks, hydraulic pumps such as vane pumps and piston pumps, control valves for adjusting the flow rate, direction and pressure, actuators such as hydraulic cylinders and hydraulic pumps, and piping connecting them. Among these parts, in the hydraulic pump, the control valve, and the actuator, the hydraulic fluid flows through a narrow path and is exposed to a high shear condition. Reducing the viscosity at the main parts of the hydraulic system such as hydraulic pumps, control valves, and actuators is considered to be effective as one of the methods for power saving of the hydraulic system. Lowering the temporary shear viscosity under high shear conditions (hereinafter sometimes referred to as “high shear viscosity”) can be expected to further contribute to power saving of the hydraulic device.
For example, a hydraulic device that is normally operated at a tank oil temperature of around 40 ° C. like an injection molding machine can be expected to contribute to power saving by reducing the high shear viscosity at 40 ° C.
また、より高温で運転される油圧装置や、タンク油温が４０℃前後で運転されていても、局所的に高温になる箇所が発生する油圧装置も想定される。その場合、高温での高せん断粘度を低くすることもまた、省電力化に寄与できることが期待できる。
高せん断粘度を低くするためには、基油に適切なポリマーを配合することが考えられる。しかしながら、高せん断粘度を低くするために配合されるポリマーは、高せん断下において分子の切断を生じやすいものが多いため、そのようなポリマーが配合された作動油は永久せん断安定性が低下し、せん断力による永久的な粘度低下が起こりやすい傾向にある。その結果、例えば、油圧ポンプやアクチュエーターにおいて、適切な油膜を保持しにくくなることが考えられる。
In addition, a hydraulic device that is operated at a higher temperature and a hydraulic device that is locally operated at a high temperature even when the tank oil temperature is operated at around 40 ° C. are also envisaged. In that case, lowering the high shear viscosity at high temperature can also be expected to contribute to power saving.
In order to reduce the high shear viscosity, it is conceivable to add an appropriate polymer to the base oil. However, since many of the polymers blended to reduce the high shear viscosity are likely to cause molecular cleavage under high shear, hydraulic fluids blended with such polymers have reduced permanent shear stability, There is a tendency for permanent viscosity reduction due to shear force. As a result, for example, it may be difficult to hold an appropriate oil film in a hydraulic pump or an actuator.
本発明は、高せん断条件下での一時せん断粘度が低く、かつ永久せん断安定性に優れた作動油組成物を提供することを目的とする。 An object of the present invention is to provide a hydraulic oil composition having a low temporary shear viscosity under high shear conditions and an excellent permanent shear stability.
本発明者は、上記課題を解決するために鋭意研究を行った結果、特定の４０℃動粘度を有する炭化水素系潤滑油基油に、スチレン系星型粘度指数向上剤を配合し、得られる組成物の４０℃における動粘度を特定の範囲にすることで、高せん断条件下での一時せん断粘度が低く、かつ永久せん断安定性に優れた作動油組成物が得られることを見出し、この知見に基づいて本発明を完成させるに至った。 As a result of diligent research to solve the above problems, the present inventor is obtained by blending a styrene-based star viscosity index improver with a hydrocarbon-based lubricating base oil having a specific 40 ° C. kinematic viscosity. It was found that by setting the kinematic viscosity at 40 ° C. of the composition within a specific range, a hydraulic oil composition having a low temporary shear viscosity under high shear conditions and an excellent permanent shear stability can be obtained. Based on this, the present invention has been completed.
すなわち、本発明は、（Ａ）４０℃動粘度が４〜４０ｍｍ２／ｓである炭化水素系潤滑油基油、及び（Ｂ）スチレン系星型粘度指数向上剤を含有する組成物であって、該組成物の４０℃における動粘度が１９〜５１ｍｍ２／ｓであることを特徴とする工業用作動油組成物を提供するものである。 That is, the present invention is a composition comprising (A) a hydrocarbon-based lubricating base oil having a kinematic viscosity at 40 ° C. of 4 to 40 mm 2 / s, and (B) a styrene-based star viscosity index improver. The kinematic viscosity at 40 ° C. of the composition is 19 to 51 mm 2 / s, and an industrial hydraulic oil composition is provided.
また、本発明は、上記工業用作動油組成物において、（Ｂ）成分であるスチレン系星型粘度指数向上剤の重量平均分子量が、２５０，０００〜６００，０００である工業用作動油組成物を提供するものである。 Further, the present invention provides the industrial hydraulic oil composition according to the above-mentioned industrial hydraulic oil composition, wherein the weight average molecular weight of the styrene-based star viscosity index improver as the component (B) is 250,000 to 600,000. Is to provide.
本発明の工業用作動油組成物は、高せん断条件下での一時せん断粘度が低く、かつ永久せん断安定性に優れている。なお、「一時せん断粘度」とは、せん断力がかかった条件下で一時的に変化した粘度をいう。一方、作動油は、せん断力がかかることで化学構造の不可逆的な変化が生じ、せん断力を解除した条件に戻しても粘度が元に戻らない、すなわち永久的な粘度低下を起こすことがある。このせん断力による永久的な粘度低下に対する耐性を「永久せん断安定性」という。よって、「高せん断条件下での一時せん断粘度が低く、かつ永久せん断安定性に優れている」ということは、「高せん断力がかかった条件下での粘度は低いが、この高せん断力を取り除いた後の粘度は、高せん断力をかける前の粘度と同じか、またはそれに近い粘度になる」ということを意味する。
よって、本発明の工業用作動油組成物は、省電力型工業用作動油として産業機械等に好適に用いることができる。
The industrial hydraulic fluid composition of the present invention has a low temporary shear viscosity under high shear conditions and is excellent in permanent shear stability. The “temporary shear viscosity” refers to a viscosity that temporarily changes under a condition where a shearing force is applied. On the other hand, the hydraulic oil undergoes irreversible changes in its chemical structure due to the application of shearing force, and the viscosity does not return to its original state even when the shearing force is released, that is, it may cause a permanent decrease in viscosity. . This resistance to permanent viscosity reduction due to shear force is referred to as “permanent shear stability”. Therefore, “low temporary shear viscosity under high shear conditions and excellent permanent shear stability” means that “viscosity under low shear conditions is low, but this high shear force is It means that the viscosity after removal is the same as or close to the viscosity before applying a high shear force.
Therefore, the industrial hydraulic fluid composition of the present invention can be suitably used for industrial machines and the like as a power-saving industrial hydraulic fluid.
（１）基油
本発明の工業用作動油組成物に用いる炭化水素系基油としては、ポリαオレフィンやポリαオレフィン以外の炭化水素系基油等が挙げられ、１種類の基油成分を単独使用してもよいし、２種類以上の基油成分を混合してもよい。また、ポリαオレフィンとポリαオレフィン以外の炭化水素系潤滑油基油を混合して用いてもよい。
(1) Base oil Examples of the hydrocarbon base oil used in the industrial hydraulic oil composition of the present invention include poly-α olefins and hydrocarbon base oils other than poly-α olefins. It may be used alone, or two or more kinds of base oil components may be mixed. Moreover, you may mix and use hydrocarbon type base oil other than poly alpha olefin and poly alpha olefin.
ポリαオレフィンはα−オレフィンの共重合体であり、例えば、炭素数が６〜１８のα−オレフィンの１０量体以下のものが好ましい。特に好ましいポリαオレフィンは、α−デセン（炭素数１０）の２〜４量体、またはα−ドデセン（炭素数１２）の２〜４量体を中心に、それらの５量体以上のものを含有するものである。ポリαオレフィンの１分子当りの平均炭素数は、上記の４０℃動粘度範囲である限り特に制限はない。 The poly-α-olefin is a copolymer of α-olefin, and for example, an α-olefin having a number of carbon atoms of 6 to 18 is preferably a 10-mer or less. Particularly preferred poly-α-olefins are α-decene (carbon number 10) 2 to 4 mer, or α-dodecene (carbon number 12) 2 to 4 mer, and more than those pentamers. It contains. The average number of carbon atoms per molecule of the poly α-olefin is not particularly limited as long as it is in the above 40 ° C. kinematic viscosity range.
ポリαオレフィンの好適な製造例としては、エチレンの低重合またはワックスの熱分解によって炭素数６〜１８のα−オレフィンを合成し、このα−オレフィン２〜９単位を重合し、水添反応を行うことによって合成される。
ポリαオレフィン以外の炭化水素系潤滑油基油としては、原油の潤滑油留分を溶剤精製、水素化精製、水素化分解精製など適宜組合せた製造された鉱油系炭化水素基油や、溶剤脱ロウによるスラックワックスやフィッシャー・トロプシュ合成で得られたワックス等の原料を水素化処理、水素化分解処理して得た基油などが挙げられる。
As a suitable production example of poly α-olefin, an α-olefin having 6 to 18 carbon atoms is synthesized by low polymerization of ethylene or thermal decomposition of wax, 2 to 9 units of this α-olefin are polymerized, and hydrogenation reaction is performed. Synthesized by doing.
Hydrocarbon base oils other than poly-alpha olefins include mineral oil base oils produced by combining crude oil fractions as appropriate, including solvent refining, hydrorefining, hydrocracking refining, and solvent removal. Examples thereof include base oils obtained by hydrotreating and hydrocracking raw materials such as slack wax by wax and wax obtained by Fischer-Tropsch synthesis.
鉱油系潤滑油基油の好ましい製造方法としては、以下の方法が挙げられる。まず、原油の常圧蒸留で得られたボトム油を減圧蒸留装置で処理する。そこで得られた減圧軽油を水素化処理および水素化分解を行い、その後、軽質分、燃料分を減圧ストリッパーで除去した残渣物を得る。この残渣物を減圧蒸留し、得られた潤滑油留分を水素化脱ロウ処理、安定化処理を行う。 The following method is mentioned as a preferable manufacturing method of mineral oil type | system | group lubricating base oil. First, bottom oil obtained by atmospheric distillation of crude oil is treated with a vacuum distillation apparatus. The vacuum gas oil thus obtained is hydrotreated and hydrocracked, and then a residue obtained by removing light and fuel components with a vacuum stripper is obtained. This residue is distilled under reduced pressure, and the resulting lubricating oil fraction is subjected to hydrodewaxing treatment and stabilization treatment.
本発明の工業用作動油組成物に用いる炭化水素系潤滑油基油の４０℃動粘度は、ＪＩＳ Ｋ２２８３動粘度試験方法において、４〜４０ｍｍ２／ｓであり、より好ましくは８〜３５ｍｍ２／ｓであり、さらに好ましくは１０〜３０ｍｍ２／ｓであり、特に好ましくは１５〜２５ｍｍ２／ｓである。４０℃動粘度が４ｍｍ２／ｓ未満であると、適当な油膜厚さが保たれなくなり、十分な摩耗防止性を得づらくなる。４０℃動粘度が４０ｍｍ２／ｓを超えると、作動油として適切な動粘度に調整するために、後述する粘度指数向上剤の配合量を減らす必要が生じ、高せん断粘度が大きくなり、十分な省電力効果を得づらくなる。なお、複数の基油成分を混合した基油を用いる場合には、混合後の基油の４０℃動粘度が上記の範囲内であればよく、各基油成分の４０℃動粘度が上記範囲内であることがより好ましい。 40 ° C. The kinematic viscosity of the hydrocarbon-based lubricating base oil used in industrial hydraulic oil composition of the present invention, the JIS K2283 kinematic viscosity test method is 4 to 40 mm 2 / s, more preferably 8~35mm 2 / s, more preferably 10 to 30 mm 2 / s, and particularly preferably 15 to 25 mm 2 / s. When the 40 ° C. kinematic viscosity is less than 4 mm 2 / s, an appropriate oil film thickness cannot be maintained, and it is difficult to obtain sufficient wear resistance. When the 40 ° C. kinematic viscosity exceeds 40 mm 2 / s, it is necessary to reduce the blending amount of the viscosity index improver described later in order to adjust the kinematic viscosity to be appropriate as the hydraulic oil, and the high shear viscosity becomes large and sufficient. It becomes difficult to obtain a power saving effect. In addition, when using the base oil which mixed the some base oil component, the 40 degreeC kinematic viscosity of the base oil after mixing should just be in said range, and the 40 degreeC kinematic viscosity of each base oil component is the said range. More preferably, it is within.
なお、工業用作動油組成物の粘度グレードは、４０℃の動粘度により定められており、各装置、運転条件に適した粘度グレードの作動油を使うことが求められる。例えば粘度グレード（以下ＶＧと記す）が４６である作動油は、ＶＧ２２の作動油よりも、より摩耗防止性が求められる装置、運転条件にて使用されることが考えられる。よって、ＶＧ４６、すなわち組成物の４０℃動粘度が４１．４〜５０．６ｍｍ２／ｓである作動油を調製する場合と、ＶＧ３２、すなわち組成物の４０℃動粘度が２８．８〜３５．２ｍｍ２／ｓである作動油を調製する場合と、ＶＧ２２、すなわち組成物の４０℃動粘度が１９．８〜２４．２ｍｍ２／ｓである作動油を調製する場合とでは、それぞれ使用する基油の好ましい４０℃動粘度は異なる。 The viscosity grade of the industrial hydraulic oil composition is determined by a kinematic viscosity of 40 ° C., and it is required to use a hydraulic oil of a viscosity grade suitable for each device and operating conditions. For example, hydraulic oil having a viscosity grade (hereinafter referred to as VG) of 46 is considered to be used in an apparatus and operating conditions that require higher wear resistance than hydraulic oil of VG22. Therefore, VG46, that is, a hydraulic oil having a composition having a 40 ° C. kinematic viscosity of 41.4 to 50.6 mm 2 / s, and VG 32, that is, a composition having a 40 ° C. kinematic viscosity of 28.8 to 35. In the case of preparing a hydraulic oil having 2 mm 2 / s, and in the case of preparing a hydraulic oil in which VG22, that is, the composition having a kinematic viscosity of 40 ° C. of 19.8 to 24.2 mm 2 / s, is used. The preferred 40 ° C. kinematic viscosity of the oil is different.
例えば、本発明においてＶＧ４６の作動油を調製する場合、本発明で使用する基油の４０℃動粘度は４〜４０ｍｍ２／ｓであり、好ましくは１０〜３８ｍｍ２／ｓであり、さらに好ましくは１３〜３５ｍｍ２／ｓであり、特に好ましくは１４〜２５ｍｍ２／ｓである。
また、本発明においてＶＧ３２の作動油を調製する場合、本発明で使用する基油の動粘度は好ましくは４〜３０ｍｍ２／ｓであり、さらに好ましくは９〜２８ｍｍ２／ｓであり、特に好ましくは１１〜２５ｍｍ２／ｓである。
また、本発明においてＶＧ２２の作動油を調製する場合、本発明で使用する基油の動粘度は好ましくは４〜２０ｍｍ２／ｓであり、さらに好ましくは８〜１８ｍｍ２／ｓであり、特に好ましくは１０〜１５ｍｍ２／ｓである。
For example, when preparing hydraulic oil of VG46 in the present invention, the 40 ° C. kinematic viscosity of the base oil used in the present invention is 4 to 40 mm 2 / s, preferably 10 to 38 mm 2 / s, more preferably 13~35mm a 2 / s, particularly preferably 14~25mm 2 / s.
Moreover, when preparing the hydraulic oil of VG32 in this invention, the kinematic viscosity of the base oil used by this invention becomes like this. Preferably it is 4-30 mm < 2 > / s, More preferably, it is 9-28 mm < 2 > / s, Especially preferably Is 11 to 25 mm 2 / s.
Moreover, when preparing the hydraulic oil of VG22 in this invention, the kinematic viscosity of the base oil used by this invention becomes like this. Preferably it is 4-20 mm < 2 > / s, More preferably, it is 8-18 mm < 2 > / s, Especially preferably, Is 10-15 mm 2 / s.
本発明の工業用作動油組成物で用いる炭化水素系潤滑油基油は、４０℃動粘度が上記範囲を満たすものであれば、どのような性状のものでもよく、特に制限はないが、より良好な性能を確保するという観点からは、ポリαオレフィン以外の炭化水素系基油は以下の性状を有することが好ましい。 The hydrocarbon-based lubricating base oil used in the industrial hydraulic oil composition of the present invention may have any properties as long as the kinematic viscosity at 40 ° C. satisfies the above range, and is not particularly limited. From the viewpoint of ensuring good performance, the hydrocarbon base oil other than the poly-α-olefin preferably has the following properties.
本発明の工業用作動油組成物で用いる炭化水素系潤滑油基油の粘度指数は、ＪＩＳ Ｋ２２８３動粘度試験方法において、９０以上であることが好ましい。粘度指数を９０以上とすることで、後述する好ましい組成物の粘度指数を得やすく、その結果、低温粘度を低く抑え、低温始動時の電力消費量を抑制できる組成物を得やすくなる。また、組成物の粘度指数は、本発明の成分である粘度指数向上剤の配合量が多いほど、高くすることができるが、基油の粘度指数が高ければ、この配合量を抑制することができる。この観点から、基油の粘度指数は、より好ましくは１０３以上であり、さらに好ましくは１０５以上であり、特に好ましくは１１０以上であり、最も好ましくは１２０以上である。 The viscosity index of the hydrocarbon-based lubricating base oil used in the industrial hydraulic oil composition of the present invention is preferably 90 or more in the JIS K2283 kinematic viscosity test method. By setting the viscosity index to 90 or more, it is easy to obtain a viscosity index of a preferable composition described later, and as a result, it becomes easy to obtain a composition that can suppress low-temperature viscosity to a low level and suppress power consumption at low-temperature startup. Further, the viscosity index of the composition can be increased as the blending amount of the viscosity index improver that is a component of the present invention is increased. However, if the viscosity index of the base oil is high, the blending amount can be suppressed. it can. From this viewpoint, the viscosity index of the base oil is more preferably 103 or more, further preferably 105 or more, particularly preferably 110 or more, and most preferably 120 or more.
本発明の工業用作動油組成物で用いる炭化水素系潤滑油基油の密度は、ＪＩＳ Ｋ２２４９密度試験方法（１５℃）において、好ましくは０．８０〜０．８５ｇ／ｃｍ３である。１５℃密度を０．８０以上とすることで、添加剤の適度な溶解性を確保しやすい傾向にあるため好ましい。１５℃密度を０．８５ｇ／ｃｍ３以下とすることで、配管等の圧力損失を抑制しやすく、より高い省電力効果を得やすい傾向にあるため好ましい。 The density of the hydrocarbon-based lubricating base oil used in the industrial hydraulic oil composition of the present invention is preferably 0.80 to 0.85 g / cm 3 in the JIS K2249 density test method (15 ° C.). It is preferable to set the density at 15 ° C. to 0.80 or more because it tends to ensure appropriate solubility of the additive. The 15 ℃ Density With 0.85 g / cm 3 or less, easily suppressed pressure loss such as a pipe, preferably because of the tendency to obtain a higher power saving effect.
本発明の工業用作動油組成物で用いる炭化水素系潤滑油基油のナフテン分（％ＣＮ）は、ＡＳＴＭ Ｄ３２３８環分析方法において、好ましくは８〜２７である。％ＣＮを８以上とすることで、添加剤の溶解性を確保しやすい傾向にあるため好ましい。％ＣＮを２７以下とすることで、高粘度指数基油となりやすい傾向にある。 The naphthene content (% CN) of the hydrocarbon-based lubricating base oil used in the industrial hydraulic oil composition of the present invention is preferably 8 to 27 in the ASTM D3238 ring analysis method. It is preferable to set% CN to 8 or more because it tends to ensure the solubility of the additive. By setting% CN to 27 or less, it tends to be a high viscosity index base oil.
本発明の工業用作動油組成物で用いる炭化水素系潤滑油基油のアニリン点は、ＪＩＳ Ｋ２２５６アニリン点試験方法において１００〜１３０℃である。アニリン点を１００℃以上とすることで、高粘度指数基油となりやすい傾向にある。アニリン点を１３０℃以下とすることで、添加剤の溶解性を確保しやすい傾向にあるため好ましい。 The aniline point of the hydrocarbon-based lubricating base oil used in the industrial hydraulic oil composition of the present invention is 100 to 130 ° C. in the JIS K2256 aniline point test method. By setting the aniline point to 100 ° C. or higher, it tends to be a high viscosity index base oil. It is preferable to set the aniline point to 130 ° C. or lower because it tends to ensure the solubility of the additive.
本発明の工業用作動油組成物には、本発明の効果を損ねない範囲内で、前記基油以外の他の基油を含んでもよいが、前記基油の含有割合は、基油全量に対して７０質量であることが好ましく、８０質量％以上であることがより好ましく、８５質量％以上であることがさらに好ましく、９０質量％以上であることが特に好ましい。
本発明の工業用作動油組成物において、基油の含有量は、作動油組成物全量に対して、好ましくは８５〜９９．５質量％であり、より好ましくは８７〜９９．８質量％であり、さらに好ましくは９０〜９９．７５質量％である。
The industrial hydraulic oil composition of the present invention may contain a base oil other than the base oil as long as the effects of the present invention are not impaired, but the base oil content is based on the total amount of the base oil. On the other hand, it is preferably 70% by mass, more preferably 80% by mass or more, still more preferably 85% by mass or more, and particularly preferably 90% by mass or more.
In the industrial hydraulic oil composition of the present invention, the content of the base oil is preferably 85 to 99.5% by mass, more preferably 87 to 99.8% by mass, based on the total amount of the hydraulic oil composition. Yes, more preferably 90 to 99.75% by mass.
（２）粘度指数向上剤
本発明の工業用作動油組成物に用いるスチレン系星型粘度指数向上剤としては、ビニル芳香族化合物またはそのアルキル化誘導体から選ばれる１種以上のモノマーと、共役ジエンから選ばれる１種以上のモノマーを共重合させたのち、水素化処理して得られるものが挙げられる。
(2) Viscosity index improver The styrenic star viscosity index improver used in the industrial hydraulic fluid composition of the present invention includes one or more monomers selected from vinyl aromatic compounds or alkylated derivatives thereof, and conjugated dienes. Examples thereof include one obtained by copolymerizing one or more monomers selected from the following, followed by hydrogenation treatment.
ビニル芳香族化合物またはそのアルキル化誘導体としては、スチレン、メチルスチレン、エチルスチレン、ジビニルベンゼン等が挙げられる。
共役ジエンとしては、ブタジエン、イソプレン、２−メチル−ブタジエン、２，３−ジメチル−ブタジエン、２−エチル−ブタジエン、２，３−ジエチル−ブタジエン、ペンタジエン、２−メチル−ペンタジエン、３−メチル−ペンタジエン等が挙げられる。
Examples of vinyl aromatic compounds or alkylated derivatives thereof include styrene, methylstyrene, ethylstyrene, divinylbenzene, and the like.
Conjugated dienes include butadiene, isoprene, 2-methyl-butadiene, 2,3-dimethyl-butadiene, 2-ethyl-butadiene, 2,3-diethyl-butadiene, pentadiene, 2-methyl-pentadiene, and 3-methyl-pentadiene. Etc.
ビニル芳香族化合物またはそのアルキル化誘導体から選ばれる１種以上のモノマーの共重合割合は、好ましくは２０〜７０質量％であり、より好ましくは３０〜６０質量％である。共役ジエンから選ばれる１種以上のモノマーの共重合割合は、好ましくは３０〜８０質量％であり、より好ましくは４０〜７０質量％である。 The copolymerization ratio of one or more monomers selected from vinyl aromatic compounds or alkylated derivatives thereof is preferably 20 to 70% by mass, more preferably 30 to 60% by mass. The copolymerization ratio of one or more monomers selected from conjugated dienes is preferably 30 to 80% by mass, more preferably 40 to 70% by mass.
上記スチレン系星型粘度指数向上剤は、共役ジエンを共重合させた後に、水素化処理しているので、共役ジエンに由来する不飽和結合は少なくなるが、共役ジエンに由来する不飽和結合を有するものであってもよい。共役ジエンに由来する不飽和度は低い方が好ましく、共役ジエンに基づく繰り返し単位の合計量に対して、不飽和結合を有する共役ジエンに基づく繰り返し単位が２０質量％以下がより好ましく、１０質量％以下がさらに好ましく、５質量％以下が特に好ましい。 Since the styrenic star viscosity index improver is hydrogenated after copolymerizing conjugated dienes, unsaturated bonds derived from conjugated dienes are reduced, but unsaturated bonds derived from conjugated dienes are reduced. You may have. The degree of unsaturation derived from the conjugated diene is preferably low, and the repeating unit based on the conjugated diene having an unsaturated bond is more preferably 20% by mass or less, based on the total amount of the repeating unit based on the conjugated diene. The following is more preferable, and 5% by mass or less is particularly preferable.
また、本発明の工業用作動油組成物に用いるスチレン系星型粘度指数向上剤は、核となるポリマーの中心部からアームポリマーが３本以上分岐した構造、すなわちいわゆる「星型構造」を持つものである。アームポリマーの数は、特に制限はないが、５本以上が好ましく、７本以上がより好ましい。アームポリマーの数を５本以上とすることで、後述する重量平均分子量が得られやすく、より低い高せん断粘度を得られやすい傾向にある。また、より良好な永久せん断安定性を得やすい傾向にある。
好ましいスチレン系星型粘度指数向上剤として、スチレン‐ブタジエン星型ポリマー、ジビニルベンゼン−イソプレン星形ポリマー等が挙げられる。
In addition, the styrenic star viscosity index improver used in the industrial hydraulic oil composition of the present invention has a structure in which three or more arm polymers are branched from the center of the core polymer, that is, a so-called “star structure”. Is. The number of arm polymers is not particularly limited, but is preferably 5 or more, more preferably 7 or more. By setting the number of arm polymers to 5 or more, the weight average molecular weight described later tends to be obtained, and a lower high shear viscosity tends to be obtained. Further, it tends to easily obtain better permanent shear stability.
Preferred styrenic star viscosity index improvers include styrene-butadiene star polymers and divinylbenzene-isoprene star polymers.
スチレン系星型粘度指数向上剤の重量平均分子量は、特に制限はないが、好ましくは２５０，０００〜６００，０００であり、より好ましくは３００，０００〜５５０，０００であり、さらに好ましくは３５０，０００〜５２０，０００である。重量平均分子量を２５０，０００以上とすることで、高せん断粘度を低く抑えやすく、より高い省電力効果が得やすい傾向にある。重量平均分子量を６００，０００以下とすることで、より良好な永久せん断安定性を得やすい傾向にある。なお、重量平均分子量はゲル浸透クロマトグラフィーで測定され、ポリスチレン換算による値である。 The weight average molecular weight of the styrenic star viscosity index improver is not particularly limited, but is preferably 250,000 to 600,000, more preferably 300,000 to 550,000, still more preferably 350, 000 to 520,000. By setting the weight average molecular weight to 250,000 or more, high shear viscosity can be easily suppressed, and a higher power saving effect tends to be obtained. By setting the weight average molecular weight to 600,000 or less, it tends to easily obtain better permanent shear stability. The weight average molecular weight is measured by gel permeation chromatography and is a value in terms of polystyrene.
本発明の工業用作動油組成物に用いるスチレン系星型粘度指数向上剤は、主としてビニル芳香族化合物またはそのアルキル化誘導体から選ばれる１つ以上のモノマーと、共役ジエンから選ばれる１つ以上のモノマーからなるが、その他に、本発明の目的が損なわれない限り、上記モノマー以外に極性基をもつモノマーを含有してもよい。極性基をもつモノマーの具体例としては、アルキル−ビニルピリジン、Ｎ−ビニルピロリドン及びビニルイミダゾール等の窒素原子含有化合物、ポリアルキレングリコールエステル、マレイン酸エステル及びフマル酸エステル等のエステル類が挙げられる。これらは１種でも、２種以上でも用いることができる。 The styrenic star-type viscosity index improver used in the industrial hydraulic oil composition of the present invention is one or more monomers selected mainly from vinyl aromatic compounds or alkylated derivatives thereof, and one or more selected from conjugated dienes. Although it consists of a monomer, you may contain the monomer which has a polar group other than the said monomer as long as the objective of this invention is not impaired. Specific examples of the monomer having a polar group include nitrogen atom-containing compounds such as alkyl-vinyl pyridine, N-vinyl pyrrolidone and vinyl imidazole, and esters such as polyalkylene glycol ester, maleic acid ester and fumaric acid ester. These can be used alone or in combination of two or more.
スチレン系星型粘度指数向上剤の作動油組成物全量に対する配合量は、好ましくは０．１〜１０質量％であり、より好ましくは０．２〜８質量％であり、さらに好ましくは０．２５〜５．０質量％である。配合量を０．１質量％以上とすることで、高せん断条件下での一時せん断粘度の低下が大きくなり、省電力効果をより得やすくできる傾向にある。配合量を１０質量％以下とすることで、より良好な永久せん断安定性を得やすい傾向にある。
上記のスチレン系星型粘度指数向上剤は、１種を単独使用してもよいし、２種以上を併用してもよい。
The blending amount of the styrenic star viscosity index improver with respect to the total amount of the hydraulic oil composition is preferably 0.1 to 10% by mass, more preferably 0.2 to 8% by mass, and still more preferably 0.25. It is -5.0 mass%. When the blending amount is 0.1% by mass or more, the decrease in temporary shear viscosity under high shear conditions is increased, and the power saving effect tends to be more easily obtained. When the blending amount is 10% by mass or less, better permanent shear stability tends to be easily obtained.
One of the above styrenic star viscosity index improvers may be used alone, or two or more thereof may be used in combination.
また、本発明の工業用作動油組成物には、本発明の効果を損ねない範囲内であれば、前記スチレン系粘度指数向上剤以外の他の粘度指数向上剤を含んでもよい。前記スチレン系粘度指数向上剤以外の他の粘度指数向上剤としては、たとえば、ポリメタクリレート系粘度指数向上剤、エチレン-プロピレン共重合体、ポリイソブチレンなどが挙げられる。 In addition, the industrial hydraulic oil composition of the present invention may contain a viscosity index improver other than the styrenic viscosity index improver as long as the effects of the present invention are not impaired. Examples of the viscosity index improver other than the styrene viscosity index improver include a polymethacrylate viscosity index improver, an ethylene-propylene copolymer, and polyisobutylene.
（３）その他の添加剤
本発明の工業用作動油組成物には、本発明の目的が損なわれない範囲で、必要に応じて各種の公知の添加剤を配合することができる。たとえば、酸化防止剤、極圧剤、油性剤、清浄分散剤、さび止め剤、金属不活性化剤、流動点降下剤、泡消剤、抗乳化剤等が挙げられる。
酸化防止剤としては、２，６−ジ−ｔｅｒｔ−ブチル−ｐ−クレゾール等のフェノール系酸化防止剤、アルキル化ジフェニルアミン、アルキル化フェニル−α−ナフチルアミン等のアミン系酸化防止剤、ホスホン酸エステル等のリン系酸化防止剤等が挙げられる。
(3) Other Additives Various known additives can be blended with the industrial hydraulic oil composition of the present invention, if necessary, as long as the object of the present invention is not impaired. For example, antioxidants, extreme pressure agents, oily agents, detergents and dispersants, rust inhibitors, metal deactivators, pour point depressants, defoamers, demulsifiers and the like can be mentioned.
Antioxidants include phenol-based antioxidants such as 2,6-di-tert-butyl-p-cresol, amine-based antioxidants such as alkylated diphenylamine and alkylated phenyl-α-naphthylamine, phosphonic acid esters, etc. And phosphorus-based antioxidants.
極圧剤としては、ホスフェート、ホスファイト等のリン系極圧剤、硫化オレフィン、ポリサルファイド、硫化油脂、ジチオリン酸誘導体等の硫黄系極圧剤、ZnDTP、ZnDTC等の有機金属系極圧剤が挙げられる。特に好ましいものとして、硫化オレフィン、ジチオリン酸誘導体が挙げられる。
油性剤としては、オレイン酸、ステアリン酸等の高級脂肪酸、オレイルアルコール等の高級アルコール、オレイルアミン等のアミン、ブチルステアレート等のエステルが挙げられる。
清浄分散剤としては、アルケニルコハク酸イミド、アルケニルコハク酸エステル等の無灰系清浄分散剤、アルカリ土類金属系清浄分散剤が挙げられる。
さび止め剤としては、カルボン酸、金属セッケン、カルボン酸アミン塩、スルホン酸の金属塩、多価アルコールの部分エステル等が挙げられる。
Examples of extreme pressure agents include phosphorous extreme pressure agents such as phosphates and phosphites, sulfur-based extreme pressure agents such as sulfurized olefins, polysulfides, sulfurized fats and oils, dithiophosphoric acid derivatives, and organometallic extreme pressure agents such as ZnDTP and ZnDTC. It is done. Particularly preferred are sulfurized olefins and dithiophosphoric acid derivatives.
Examples of the oily agent include higher fatty acids such as oleic acid and stearic acid, higher alcohols such as oleyl alcohol, amines such as oleylamine, and esters such as butyl stearate.
Examples of the cleaning dispersant include ashless cleaning dispersants such as alkenyl succinimides and alkenyl succinic esters, and alkaline earth metal cleaning dispersants.
Examples of the rust inhibitor include carboxylic acid, metal soap, carboxylic acid amine salt, sulfonic acid metal salt, and partial ester of polyhydric alcohol.
金属不活性化剤としては、ベンゾトリアゾ−ルおよびその誘導体、アルキルコハク酸誘導体が挙げられる。
流動点降下剤としては、ポリアルキルメタクリレート、ポリブテン、ポリアルキルスチレン、ポリビニルアセテート、ポリアルキルアクリレート等が挙げられる。
消泡剤としては、シリコーン油やエステル系消泡剤等が挙げられる。
抗乳化剤としては、アニオン系界面活性剤、カチオン系界面活性剤、非イオン系界面活性剤等の抗乳化剤が挙げられる。
Examples of metal deactivators include benzotriazole and derivatives thereof, and alkyl succinic acid derivatives.
Examples of the pour point depressant include polyalkyl methacrylate, polybutene, polyalkyl styrene, polyvinyl acetate, polyalkyl acrylate and the like.
Examples of antifoaming agents include silicone oil and ester-based antifoaming agents.
Examples of the demulsifier include demulsifiers such as an anionic surfactant, a cationic surfactant, and a nonionic surfactant.
（４）組成物の性状
本発明の工業用作動油組成物の４０℃動粘度は、ＪＩＳ Ｋ２２８３動粘度試験方法において、１９〜５１ｍｍ２／ｓであり、より好ましくは２４〜４８ｍｍ２／ｓであり、さらに好ましくは２８〜４６ｍｍ２／ｓである。４０℃動粘度が１９ｍｍ２／ｓ未満であると、適当な油膜厚さが保たれなくなり、十分な摩耗防止性が得にくくなる傾向にある。４０℃動粘度が５１ｍｍ２／ｓを超えると、高せん断粘度が大きくなり、省電力効果を十分に得られなくなる傾向にある。
(4) 40 ° C. kinematic viscosity of industrial fluid composition of the properties present invention compositions in the JIS K2283 kinematic viscosity test method, a 19~51mm 2 / s, more preferably 24~48mm 2 / s More preferably, it is 28-46 mm < 2 > / s. When the 40 ° C. kinematic viscosity is less than 19 mm 2 / s, an appropriate oil film thickness cannot be maintained, and sufficient wear resistance tends to be difficult to obtain. When the 40 ° C. kinematic viscosity exceeds 51 mm 2 / s, the high shear viscosity increases and the power saving effect tends to be insufficient.
本発明の工業用作動油組成物の粘度指数は、特に制限はないが、ＪＩＳ Ｋ２２８３動粘度試験方法において、好ましくは１４０以上であり、さらに好ましくは１４３以上である。粘度指数を１４０以上とすることで、低温粘度を抑制しやすいため、低温始動時の電力消費量を抑制しやすく、より高い省電力効果を得やすい傾向にある。 The viscosity index of the industrial hydraulic oil composition of the present invention is not particularly limited, but is preferably 140 or more, more preferably 143 or more in the JIS K2283 kinematic viscosity test method. By setting the viscosity index to 140 or more, it is easy to suppress the low temperature viscosity. Therefore, it is easy to suppress the power consumption at the time of low temperature start, and it is easy to obtain a higher power saving effect.
（５）用途
本発明の工業用作動油組成物は、種々の工業用作動油に適用できるが、特に油圧システムに用いる油圧作動油として好ましく用いることができる。さらには、油圧システムのうち、油圧ポンプ、油圧モーター、制御弁等、作動油がせん断状態にさらされる箇所での省電力化を図る際に特に有効である。
(5) Applications The industrial hydraulic oil composition of the present invention can be applied to various industrial hydraulic oils, but can be preferably used as a hydraulic hydraulic oil used in a hydraulic system. Furthermore, it is particularly effective in reducing the power consumption in a hydraulic system such as a hydraulic pump, a hydraulic motor, a control valve, etc., where hydraulic fluid is exposed to a shearing state.
次に、本発明を実施例によりさらに具体的に説明する。なお、本発明は、これらの例によって何ら制限されるものではない。各実施例、比較例において工業用作動油組成物の調製に用いた基油、添加剤成分は次のとおりである。
なお、４０℃動粘度、１００℃動粘度、粘度指数はＪＩＳ Ｋ２２８３動粘度試験方法、密度はＪＩＳ Ｋ２２４９密度試験方法により測定した。％ＣＮはＡＳＴＭ
Ｄ３２３８環分析により測定した。％ＣＮ算出に必要な屈折率、密度、分子量および硫黄分は、ＪＩＳ Ｋ００６２屈折率測定方法、ＪＩＳ Ｋ２２４９密度試験方法、ＡＳＴＭ Ｄ２５０２分子量試験方法、ＪＩＳ Ｋ２５４１硫黄分試験方法にて測定した。
また、重量平均分子量はゲル浸透クロマトグラフィーにて測定し、ポリスチレン換算にて算出した。ゲル浸透クロマトグラフィーはカラムにＳｈｏｄｅｘ ＧＰＣ
ＬＦ−８０４を３本、移動層にＴＨＦ、検出器に示差屈折検出器を用いた。
Next, the present invention will be described more specifically with reference to examples. In addition, this invention is not restrict | limited at all by these examples. The base oil and additive components used in the preparation of the industrial hydraulic oil composition in each Example and Comparative Example are as follows.
The 40 ° C. kinematic viscosity, 100 ° C. kinematic viscosity, and viscosity index were measured by JIS K2283 kinematic viscosity test method, and the density was measured by JIS K2249 density test method. % CN is ASTM
Measured by D3238 ring analysis. The refractive index, density, molecular weight and sulfur content necessary for calculating% CN were measured by JIS K0062 refractive index measurement method, JIS K2249 density test method, ASTM D2502 molecular weight test method, and JIS K2541 sulfur content test method.
The weight average molecular weight was measured by gel permeation chromatography and calculated in terms of polystyrene. Gel permeation chromatography is performed on Shodex GPC
Three LF-804s were used, THF was used for the moving layer, and a differential refraction detector was used for the detector.
（Ａ）基油
（Ａ−１）水素化分解鉱油
４０℃動粘度：１３．２ｍｍ２／ｓ、１００℃動粘度：３．２ｍｍ２／ｓ、粘度指数：１０６、１５℃における密度：０．８３７ｇ／ｃｍ３、％ＣＮ：２６、アニリン点：１０６℃
（Ａ−２）水素化分解鉱油
４０℃動粘度：１７．８ｍｍ２／ｓ、１００℃動粘度：４．１ｍｍ２／ｓ、粘度指数：１３５、１５℃における密度：０．８２５ｇ／ｃｍ３、％ＣＮ：１３、アニリン点：１２０℃
(A) Base oil (A-1) Hydrocracked mineral oil 40 ° C. kinematic viscosity: 13.2 mm 2 / s, 100 ° C. kinematic viscosity: 3.2 mm 2 / s, viscosity index: 106, density at 15 ° C .: 0. 837 g / cm 3 ,% CN: 26, aniline point: 106 ° C.
(A-2) Hydrocracked mineral oil 40 ° C. kinematic viscosity: 17.8 mm 2 / s, 100 ° C. kinematic viscosity: 4.1 mm 2 / s, viscosity index: 135, density at 15 ° C .: 0.825 g / cm 3 , % CN: 13, aniline point: 120 ° C
（Ａ−３）水素化分解鉱油
４０℃動粘度：２０．１ｍｍ２／ｓ、１００℃動粘度：４．３ｍｍ２／ｓ、粘度指数：１２２、１５℃における密度：０．８３４ｇ／ｃｍ３、％ＣＮ：２０、アニリン点：１１５℃
（Ａ−４）水素化分解鉱油
４０℃動粘度：３５．１ｍｍ２／ｓ、１００℃動粘度：６．３ｍｍ２／ｓ、粘度指数：１３０、１５℃における密度：０．８４２ｇ／ｃｍ３、％ＣＮ：１９、アニリン点：１２３℃
(A-3) Hydrocracked mineral oil 40 ° C. kinematic viscosity: 20.1 mm 2 / s, 100 ° C. kinematic viscosity: 4.3 mm 2 / s, viscosity index: 122, density at 15 ° C .: 0.834 g / cm 3 , % CN: 20, aniline point: 115 ° C
(A-4) Hydrocracked mineral oil 40 ° C. kinematic viscosity: 35.1 mm 2 / s, 100 ° C. kinematic viscosity: 6.3 mm 2 / s, viscosity index: 130, density at 15 ° C .: 0.842 g / cm 3 , % CN: 19, aniline point: 123 ° C
（Ａ−５）水素化分解鉱油
４０℃動粘度：４６．９ｍｍ２／ｓ、１００℃動粘度：７．７ｍｍ２／ｓ、粘度指数：１３０、１５℃における密度：０．８４２ｇ／ｃｍ３、％ＣＮ：２１、アニリン点：１２７℃
（Ａ−６）ポリαオレフィン基油（１−デセンモノマーの２〜５量体）
４０℃動粘度：１７．３ｍｍ２／ｓ、１００℃動粘度：３．９ｍｍ２／ｓ、粘度指数：１２３、１５℃における密度：０．８２０ｇ／ｃｍ３、％ＣＮ：８、アニリン点：１２０ ℃
（Ａ−７）ポリαオレフィン基油（１−デセンモノマーの２〜５量体）
４０℃動粘度：３０．５ｍｍ２／ｓ、１００℃動粘度：５．８ｍｍ２／ｓ、粘度指数：１３５、１５℃における密度：０．８２７ｇ／ｃｍ３、％ＣＮ：９、アニリン点：１２７ ℃
(A-5) Hydrocracked mineral oil 40 ° C. kinematic viscosity: 46.9 mm 2 / s, 100 ° C. kinematic viscosity: 7.7 mm 2 / s, viscosity index: 130, density at 15 ° C .: 0.842 g / cm 3 , % CN: 21, aniline point: 127 ° C
(A-6) Polyalphaolefin base oil (2- to 5-mer of 1-decene monomer)
40 ° C. kinematic viscosity: 17.3 mm 2 / s, 100 ° C. kinematic viscosity: 3.9 mm 2 / s, viscosity index: 123, density at 15 ° C .: 0.820 g / cm 3 ,% CN: 8, aniline point: 120 ℃
(A-7) Polyalphaolefin base oil (2- to 5-mer of 1-decene monomer)
40 ° C. kinematic viscosity: 30.5 mm 2 / s, 100 ° C. kinematic viscosity: 5.8 mm 2 / s, viscosity index: 135, density at 15 ° C .: 0.827 g / cm 3 ,% CN: 9, aniline point: 127 ℃
（Ｂ）粘度指数向上剤
（Ｂ−１）スチレン系星型粘度指数向上剤：ジビニルベンゼン−水素添加イソプレン星形ポリマー（アームポリマーの数：５本以上、重量平均分子量：５００，０００、希釈油含有量：８８質量％）
（Ｂ−２）スチレン系星型粘度指数向上剤：スチレン−水素添加ブタジエン星型ポリマー（アームポリマーの数：５本以上、重量平均分子量：４４０，０００、 希釈油なし）
(B) Viscosity index improver (B-1) Styrenic star viscosity index improver: divinylbenzene-hydrogenated isoprene star polymer (number of arm polymers: 5 or more, weight average molecular weight: 500,000, diluent oil Content: 88% by mass)
(B-2) Styrenic star viscosity index improver: Styrene-hydrogenated butadiene star polymer (number of arm polymers: 5 or more, weight average molecular weight: 440,000, no diluent oil)
（Ｂ−３）スチレン系粘度指数向上剤：スチレンマレイン酸ランダム共重合体（星型構造を有さない）
（重量平均分子量：２５０，０００、 希釈油含有量：３５質量％）
（Ｂ−４）ＰＭＡ系粘度指数向上剤：非分散型ポリメタクリレート粘度指数向上剤
（重量平均分子量：３３４，０００、 希釈油含有量：６０質量％）
（Ｂ−５）ＰＭＡ系粘度指数向上剤：非分散型ポリメタクリレート粘度指数向上剤
（重量平均分子量：３５，０００、 希釈油含有量：４０質量％）
（Ｂ−６）ＯＣＰ系粘度指数向上剤：エチレンプロピレンランダム共重合体
（重量平均分子量：１６，０００、希釈油なし）
(B-3) Styrenic viscosity index improver: Styrene maleic acid random copolymer (does not have a star structure)
(Weight average molecular weight: 250,000, diluted oil content: 35% by mass)
(B-4) PMA viscosity index improver: non-dispersed polymethacrylate viscosity index improver
(Weight average molecular weight: 334,000, diluted oil content: 60% by mass)
(B-5) PMA viscosity index improver: non-dispersed polymethacrylate viscosity index improver (weight average molecular weight: 35,000, diluted oil content: 40% by mass)
(B-6) OCP viscosity index improver: ethylene propylene random copolymer (weight average molecular weight: 16,000, no diluent oil)
（Ｃ）その他添加剤
（Ｃ−１） 極圧剤１：β−ジチオホスホリル化プロピオン酸
（Ｃ−２） 極圧剤２：硫化オレフィン
（Ｃ−３） 酸化防止剤：２，６−ジ−ｔｅｒｔ−ブチル−p−クレゾール、及びアルキル化ジフェニルアミン
(C) Other additives (C-1) Extreme pressure agent 1: β-dithiophosphorylated propionic acid (C-2) Extreme pressure agent 2: Sulfurized olefin (C-3) Antioxidant: 2,6-di- tert-Butyl-p-cresol and alkylated diphenylamine
（評価方法）
工業用作動油組成物の高せん断条件下における一時せん断粘度（高せん断粘度）、永久せん断安定性、および省電力効果について、下記の評価方法により評価した。
(Evaluation methods)
The temporary shear viscosity (high shear viscosity), permanent shear stability, and power saving effect under high shear conditions of the industrial hydraulic oil composition were evaluated by the following evaluation methods.
＜高せん断粘度＞
ＴＢＳ粘度計を用い、温度１００℃・せん断速度１０６ｓ−１における高せん断粘度（１００℃）、及び温度１５０℃・せん断速度１０６ｓ−１における高せん断粘度（１５０℃）を測定した（ＡＳＴＭ Ｄ４６８３準拠）。
また、ＵＳＶ（Ｕｌｔｒａ Ｓｈｅａｒ Ｖｉｓｃｏｍｅｔｅｒ、ＰＣＳ Ｉｎｓｔｒｕｍｅｎｔｓ製）を用い、温度４０℃・せん断速度１０６ｓ−１における高せん断粘度（４０℃）を測定した。
＜永久せん断安定性試験＞
超音波法（ＪＰＩ−５Ｓ−２９準拠、低出力法）にて行い、３０分超音波照射後の４０℃動粘度を測定した。超音波照射前の４０℃動粘度を基準として、４０℃動粘度低下率（％）を評価した。
<High shear viscosity>
With TBS viscometer, high shear viscosity (100 ° C.) at a temperature 100 ° C. · shear rate 10 6 s -1, and to measure the high shear viscosity (0.99 ° C.) at a temperature 0.99 ° C. · shear rate 10 6 s -1 ( According to ASTM D4683).
Further, a high shear viscosity (40 ° C.) at a temperature of 40 ° C. and a shear rate of 10 6 s −1 was measured using USV (Ultra Shear Viscometer, manufactured by PCS Instruments).
<Permanent shear stability test>
The ultrasonic method (JPI-5S-29 compliant, low output method) was performed, and the 40 ° C. kinematic viscosity after 30 minutes of ultrasonic irradiation was measured. The 40 ° C. kinematic viscosity reduction rate (%) was evaluated based on the 40 ° C. kinematic viscosity before ultrasonic irradiation.
＜省電力効果＞
射出成形機運転時の消費電力を測定、省電力効果を評価した。
日精樹脂工業株式会社製射出成形機ＦＮ−１０００を用い、原料ポリプロピレンから成形品カラーチップを作成、タンク油温４０℃での消費電力を測定した。なお、電力計は日置電機株式会社製 ３１６８クランプオンパワーハイテスタを用いた。
また、試験前の４０℃動粘度を基準とし、５０時間試験終了後の４０℃動粘度低下率（％）を評価した。
<Power saving effect>
The power consumption during operation of the injection molding machine was measured and the power saving effect was evaluated.
Using an injection molding machine FN-1000 manufactured by Nissei Plastic Industry Co., Ltd., a molded product color chip was prepared from the raw material polypropylene, and the power consumption at a tank oil temperature of 40 ° C. was measured. The power meter used was a 3168 clamp-on power high tester manufactured by Hioki Electric Co., Ltd.
Moreover, 40 degreeC kinematic viscosity fall rate (%) after the 50-hour test completion was evaluated on the basis of 40 degreeC kinematic viscosity before a test.
（実施例１〜１１）
基油に粘度指数向上剤及びその他の添加剤を表１〜３の上段に示す割合（質量％）で配合し、工業用作動油組成物を調製した。それらの作動油組成物の粘度指数、高せん断粘度および永久せん断安定性を評価し、その結果を表１〜３の下段に示す。
（比較例１〜５）
基油に粘度指数向上剤及びその他の添加剤を表４の上段に示す割合（質量％）で配合し、工業用作動油組成物を調製した。それらの作動油組成物の粘度指数、高せん断粘度および永久せん断安定性を評価し、その結果を表４の下段に示す。
(Examples 1 to 11)
Viscosity index improvers and other additives were blended with the base oil in the proportions (mass%) shown in the upper part of Tables 1 to 3 to prepare industrial hydraulic oil compositions. The viscosity index, high shear viscosity, and permanent shear stability of these hydraulic oil compositions were evaluated, and the results are shown in Tables 1 to 3.
(Comparative Examples 1-5)
Viscosity index improvers and other additives were blended with the base oil in the proportions (mass%) shown in the upper part of Table 4 to prepare an industrial hydraulic oil composition. The viscosity index, high shear viscosity and permanent shear stability of these hydraulic oil compositions were evaluated, and the results are shown in the lower part of Table 4.
（実施例３、比較例４）
実施例３、比較例４の省電力効果を測定した結果を表５に示す。
(Example 3, Comparative Example 4)
Table 5 shows the results of measuring the power saving effect of Example 3 and Comparative Example 4.
実施例１〜１１は、比較例１（星型構造ではないスチレン系粘度指数向上剤を配合）、比較例２（高分子量ポリメタクリレート系粘度指数向上剤を配合）よりも永久せん断安定性に優れており、比較例３（低分子量ポリメタクリレート系粘度指数向上剤を配合）、比較例４（エチレンプロピレン粘度指数向上剤を配合）よりも、高せん断粘度が低く、 また比較例５（粘度指数向上剤の不配合）よりも高せん断粘度が低く、粘度指数が高い。
実施例３と比較例４の省電力効果を比べると、実施例３は射出成形機運転時の消費電力が低く、省電力効果がみられる。
よって、これら実施例は、いずれも高せん断粘度低下による省電力効果が期待できると同時に、優れた永久せん断安定性、低温始動性も得られることが期待できる。
Examples 1 to 11 are more excellent in permanent shear stability than Comparative Example 1 (containing a styrene viscosity index improver that is not a star structure) and Comparative Example 2 (containing a high molecular weight polymethacrylate viscosity index improver). Compared with Comparative Example 3 (containing a low molecular weight polymethacrylate viscosity index improver) and Comparative Example 4 (containing an ethylene propylene viscosity index improver), the high shear viscosity was lower, and Comparative Example 5 (viscosity index improved) Higher shear viscosity and higher viscosity index than non-mixing agent).
Comparing the power saving effect of Example 3 and Comparative Example 4, Example 3 shows low power consumption during operation of the injection molding machine, and a power saving effect is seen.
Therefore, all of these examples can be expected to have a power saving effect due to a decrease in high shear viscosity, and at the same time, excellent permanent shear stability and low temperature startability can be expected.
本発明の工業用作動油組成物は、種々の工業用作動油に適用できるが、特に油圧システムに用いる油圧作動油として好ましく用いることができる。さらには、油圧システムのうち、油圧ポンプ、油圧モーター、制御弁等において、作動油がせん断状態にさらされる箇所での省電力化を図る際に特に有効である。
The industrial hydraulic fluid composition of the present invention can be applied to various industrial hydraulic fluids, but can be preferably used as a hydraulic hydraulic fluid particularly used in a hydraulic system. Furthermore, in a hydraulic system, in a hydraulic pump, a hydraulic motor, a control valve, etc., it is particularly effective for achieving power saving at a location where hydraulic oil is exposed to a sheared state.
Claims (2)
2. The industrial hydraulic fluid composition according to claim 1, wherein the styrene star viscosity index improver as the component (B) has a weight average molecular weight of 250,000 to 600,000.
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