JP2015147859A - 油圧作動油組成物 - Google Patents
油圧作動油組成物 Download PDFInfo
- Publication number
- JP2015147859A JP2015147859A JP2014021077A JP2014021077A JP2015147859A JP 2015147859 A JP2015147859 A JP 2015147859A JP 2014021077 A JP2014021077 A JP 2014021077A JP 2014021077 A JP2014021077 A JP 2014021077A JP 2015147859 A JP2015147859 A JP 2015147859A
- Authority
- JP
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- Prior art keywords
- acid
- linear saturated
- ester
- hydraulic fluid
- acid residue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000010720 hydraulic oil Substances 0.000 title abstract description 5
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- 239000002253 acid Substances 0.000 claims abstract description 65
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- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 41
- 239000000654 additive Substances 0.000 claims abstract description 37
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- 125000004434 sulfur atom Chemical group 0.000 claims abstract description 18
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- 238000005886 esterification reaction Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
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- 238000005984 hydrogenation reaction Methods 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- WUUHFRRPHJEEKV-UHFFFAOYSA-N tripotassium borate Chemical compound [K+].[K+].[K+].[O-]B([O-])[O-] WUUHFRRPHJEEKV-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Lubricants (AREA)
Abstract
Description
まず、油圧作動油は、ポンプやアクチュエーター等の金属部品摺動部の保護のため、組成物の動粘度が低くなりすぎることは好ましくない。その一方で、撹拌抵抗、あるいは配管部やラインフィルター等で発生する圧力損失に起因する動力損失抑制の観点から、組成物の動粘度が高くなりすぎるのも好ましくない。そのため、油圧作動油の動粘度は、ISO粘度グレードにおいて、VG32(40℃動粘度が28.8〜35.2mm2/s)、VG46(40℃動粘度:41.4〜50.6mm2/s)及びVG68(40℃動粘度:61.2〜74.8mm2/s)が一般的であり、その中でもVG46のものが最も一般的に用いられている。
・動粘度:JIS K 2283「動粘度試験方法」
・粘度指数:JIS K 2283「粘度指数算出方法」
・引火点:JIS K 2265−4「引火点試験方法(クリーブランド開放法)」
・流動点:JIS K 2269「流動点試験方法」
・酸価:JIS K 2501「中和価試験方法」
・ヨウ素価:JIS K 0070「化学製品の酸価、けん化価、エステル価、よう素価、水酸基価及び不けん化物の試験方法」
<(B)成分:フェノール系酸化防止剤、アミン系酸化防止剤>
・フェノール系酸化防止剤A:イソオクチル−3−(3,5−ジ−t−ブチル−4−ヒドロキシフェニル)プロピオネート(一般式(1)におけるR1及びR2がt−ブチル基、R3がエチレン基、R4がイソオクチル基、nが1の化合物)
・フェノール系酸化防止剤B:DBPCジ−t−ブチル−p−クレゾール
・アミン系酸化防止剤A:アルキル化ジフェニルアミン(一般式(4)におけるR11及びR12がC4及びC8のアルキル基の混合物
・アミン系酸化防止剤B:フェニレンジアミン
<(C)成分:P及びS原子を有する耐荷重能添加剤>
・β−ジチオホスホリル化プロピオン酸(一般式(5)におけるR13及びR14がイソブチル基、R15がイソプロピレン基、R16が水素の化合物)
<その他の添加剤>
・リン系耐荷重能添加剤A:酸性リン酸エステルアミン塩
・リン系耐荷重能添加剤B:トリクレジルホスフェート
・金属不活性化剤:ベンゾトリアゾール
・さび止め剤:アルケニルコハク酸ハーフエステル
・抗乳化剤:エチレンオキサイド−プロピレンオキサイドコポリマー
・消泡剤:ジメチルシリコーン
・摩擦調整剤:N−オレオイルサルコシン
・分散剤:ポリブテニルコハク酸イミド
・流動点降下剤:ポリメタクリレート
・動粘度:JIS K 2283「動粘度試験方法」
・流動点:JIS K 2269「流動点試験方法」
・抗乳化性試験:JIS K 2520「水分離性試験方法 5.抗乳化性試験方法」に準拠し、抗乳化性を評価した。
・MTM Traction Coefficient(トラクション係数測定試験):PCS Instruments社製「MTMトラクション測定器」を用いて、以下の条件のもと、トラクション係数を測定し、転がり速度10mm/s〜5mm/sにおけるトラクション係数の平均値をその試料におけるトラクション係数とした。この数値は境界潤滑条件での摩擦係数の指標であり、従って、数値が小さいほど境界潤滑条件で低摩擦係数であることを示す。
<MTM試験条件>
油温80℃、荷重50N、すべり率(SRR)100%、転がり速度100mm/s〜0mm/s
・シェル4球試験(耐摩耗試験):JPI−5S−32「潤滑油の耐摩耗性試験方法(シェル4球式)」に準拠し、回転数1200rpm、荷重40kgf、油温75℃、60分後の摩耗痕径を評価した。
・熱安定性試験:試料を40mlのサンプル瓶に取り、160℃の回転盤付き恒温槽内で所定の時間(168h)静置し、試験後のスラッジ発生量と動粘度(40℃)を測定した。スラッジを採取する際のフィルターは、孔径0.8μmのメンブレンフィルターを用いた。
・酸化安定度試験 :JIS K 2514 「回転ボンベ式酸化安定度試験方法」に基づき、RPVOT試験を行った。
・FZGギヤ試験(極圧性試験):FZGギヤ試験機を用い、ドイツ工業規格(DIN)のDIN51354−2に「Mechanical testing by the FZG gear rig method」準拠して実施した。具体的には、規格に沿った荷重をギヤに負荷したのち、ギヤ回転速度1,440rpmで21,700回転に達するまで試験を行う。ここまでを1ステージとする。以下、荷重ステージを段階的に上昇させ、各ステージ終了時におけるピニオンの16歯面における摩耗傷の合計面積を測定し、20mm2未満を合格とした。表2及び3では不合格になったステージを示す。
・生分解性試験:OECD301B法で、試験期間を28日間として実施した。
Claims (3)
- (A)多価アルコール残基と、直鎖飽和脂肪酸残基及び直鎖飽和ポリカルボン酸残基と、からなるコンプレックスエステルであり、40℃における動粘度が20〜90mm2/sであるコンプレックスエステルと、(B)フェノール系酸化防止剤及びアミン系酸化防止剤から選ばれる少なくとも1種の酸化防止剤と、(C)P原子及びS原子を有する耐荷重能添加剤と、を含有し、基油分中の(A)の含有割合が60質量%以上であり、流動点が−25℃以下であることを特徴とする油圧作動油組成物。
- 前記多価アルコール残基がヒンダードアルコール残基であり、前記直鎖飽和脂肪酸残基の炭素数が4〜24であり、前記直鎖飽和ポリカルボン酸残基が直鎖飽和二塩基酸残基であり、前記(A)コンプレックスエステルのヨウ素価が2gI2/100g以下であることを特徴とする請求項1記載の油圧作動油組成物。
- 転動型動力伝達部を有する油圧機器に用いられることを特徴とする請求項1又は2いずれか1項記載の油圧作動油組成物。
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