JPH05311187A - Heat-resistant hydraulic oil composition - Google Patents

Heat-resistant hydraulic oil composition

Info

Publication number
JPH05311187A
JPH05311187A JP11279892A JP11279892A JPH05311187A JP H05311187 A JPH05311187 A JP H05311187A JP 11279892 A JP11279892 A JP 11279892A JP 11279892 A JP11279892 A JP 11279892A JP H05311187 A JPH05311187 A JP H05311187A
Authority
JP
Japan
Prior art keywords
composition
weight
hydraulic oil
heat
alkaline earth
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
Application number
JP11279892A
Other languages
Japanese (ja)
Other versions
JP3151784B2 (en
Inventor
Hideo Kanamori
英夫 金森
Kazushi Hata
一志 畑
Makoto Ikeda
誠 池田
Toshio Yamada
寿夫 山田
Junichi Deshimaru
順一 弟子丸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Kosan Co Ltd
Original Assignee
Idemitsu Kosan Co Ltd
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Abstract

PURPOSE:To obtain the subject composition, comprising a specific base oil, zinc dithiophosphate, an alkaline earth metallic salicylate and a water separating agent in a specified proportion, excellent in heat and abrasion resistance without causing sludges even when used in a high-temperature atmosphere and suitable as a hydraulic device, etc. CONSTITUTION:The composition comprises (A) a base oil such as a synthetic oil with <=100ppm sulfur content and (B) 0.2-1wt.% zinc dithiophosphate, (C) 0.2-1wt.% alkaline earth metallic salicylate and (D) 0.01-0.5wt.% water separating agent such as polyoxyethylene octyl ether based on the total weight of the composition.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は耐熱作動油組成物に関
し、さらに詳しくは、耐熱性及び耐摩耗性に優れ、高温
雰囲気下で使用してもスラッジを発生せず、かつ水分離
性も良好な作動油組成物に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant hydraulic oil composition, more specifically, it has excellent heat resistance and wear resistance, does not generate sludge even when used in a high temperature atmosphere, and has good water separation properties. Hydraulic fluid composition.

【0002】[0002]

【従来の技術】従来、作動油としては、防錆剤(Rust i
nhibitors)と酸化防止剤(Oxidationinhibitors) とを
配合した、いわゆるR&O型、及びジチオリン酸亜鉛な
どの耐摩耗添加剤(Anti-wear agents) を配合した、い
わゆる Anti-wear型が知られている。しかしながら、近
年油圧装置が小型化,高出力化されるに伴い、前者のR
&O型作動油は耐摩耗性及び耐熱性がともに不十分とな
ってきており、一方、後者のAnti-wear 型作動油は耐摩
耗性は高いものの、耐熱性に劣るため使用できないとい
う問題が生じている。そこで、耐熱性を考慮して、清浄
分散剤を比較的多量に含むエンジン油を転用することも
考えられるが、このものは水分離型及び防錆性などが不
十分であるという実用上の問題を有している。
2. Description of the Related Art Conventionally, a rust preventive agent (Rust i
The so-called R & O type in which nhibitors) and antioxidants (Oxidation inhibitors) are mixed, and the so-called anti-wear type in which anti-wear agents such as zinc dithiophosphate are mixed are known. However, in recent years, with the downsizing and higher output of hydraulic systems, the former R
The & O type hydraulic oil has become insufficient in both wear resistance and heat resistance. On the other hand, the latter Anti-wear type hydraulic oil has high wear resistance, but has a problem that it cannot be used due to poor heat resistance. ing. Therefore, in consideration of heat resistance, it is possible to divert engine oil containing a relatively large amount of detergent-dispersant, but this is a practical problem that the water separation type and rust prevention are insufficient. have.

【0003】[0003]

【発明が解決しようとする課題】本発明は、このような
事情のもとで、耐熱性及び耐摩耗性に優れ、高温雰囲気
下で使用してもスラッジを発生せず、かつ水分離性も良
好で、高出力の油圧装置などに好適に用いられる耐熱作
動油組成物を提供することを目的になされたものであ
る。
Under these circumstances, the present invention is excellent in heat resistance and wear resistance, does not generate sludge even when used in a high temperature atmosphere, and has water separability. The object of the present invention is to provide a heat-resistant hydraulic oil composition that is good and is suitable for use in a high-power hydraulic device.

【0004】[0004]

【課題を解決するための手段】本発明者らは、前記の好
ましい性質を有する耐熱作動油組成物を開発すべく鋭意
研究を重ねた結果、硫黄分の少ない基油に、ジチオリン
酸亜鉛とサリチル酸のアルカリ土類金属塩と水分離剤と
を、それぞれ所定の割合で配合した組成物により、その
目的を達成しうることを見出した。本発明はこのような
知見に基づいて完成したものである。すなわち、本発明
は、(A)硫黄分100ppm以下の基油と、組成物全
重量に基づき、(B)ジチオリン酸亜鉛0.2〜1重量
%、(C)サリチル酸のアルカリ土類金属塩0.2〜1重
量%及び(D)水分離剤0.01〜0.5重量%とを含有す
ることを特徴とする耐熱作動油組成物を提供するもので
ある。
As a result of intensive studies to develop a heat resistant hydraulic oil composition having the above-mentioned preferable properties, the present inventors have found that zinc dithiophosphate and salicylic acid can be used as a base oil having a low sulfur content. It has been found that the object can be achieved by a composition in which the alkaline earth metal salt and the water separating agent are mixed in predetermined proportions. The present invention has been completed based on such findings. That is, the present invention is based on (A) a base oil having a sulfur content of 100 ppm or less, (B) 0.2 to 1% by weight of zinc dithiophosphate, and (C) an alkaline earth metal salt of salicylic acid. The present invention provides a heat resistant hydraulic oil composition characterized by containing 0.2 to 1% by weight and (D) a water separating agent of 0.01 to 0.5% by weight.

【0005】本発明の作動油組成物における(A)成分
の基油としては、潤滑粘度を有する鉱油又は合成油で、
硫黄分が100ppm以下のもの、具体的には温度40
℃における動粘度が10〜500cStの範囲にあり、
かつ硫黄分が100ppm以下、好ましくは50ppm
以下の鉱油又は合成油が好適に用いられる。さらに好ま
しいものとしては、%CA (n−d−M法)3以下、窒
素分10ppm以下及び色相(ASTM法)0.5以下の
性状を有するものが挙げられる。このようなものとして
は、例えば水添精製鉱油やポリ−α−オレフィンなどが
ある。本発明の組成物において、(B)成分として用い
られるジチオリン酸亜鉛としては、一般式
The base oil of the component (A) in the hydraulic oil composition of the present invention is a mineral oil or a synthetic oil having a lubricating viscosity,
Those with a sulfur content of 100 ppm or less, specifically a temperature of 40
The kinematic viscosity at 0 ° C is in the range of 10 to 500 cSt,
And the sulfur content is 100ppm or less, preferably 50ppm
The following mineral oils or synthetic oils are preferably used. More preferable are those having properties of% C A (ndM method) of 3 or less, nitrogen content of 10 ppm or less, and hue (ASTM method) of 0.5 or less. Examples of such a material include hydrogenated refined mineral oil and poly-α-olefin. In the composition of the present invention, the zinc dithiophosphate used as the component (B) has a general formula

【0006】[0006]

【化1】 [Chemical 1]

【0007】〔式中、R1 ,R2 ,R3 及びR4 はそれ
ぞれ一級もしくは二級アルキル基,アリール基又はアラ
ルキル基であり、それらはたがいに同一でも異なってい
てもよいが、総炭素数は4〜80である。〕で表わされ
る化合物を挙げることができる。このようなものの具体
例としては、ジヘキシルジチオリン酸亜鉛,ジオクチル
ジチオリン酸亜鉛,ジノニルジチオリン酸亜鉛,ジデシ
ルジチオリン酸亜鉛,ジドデシルジチオリン酸亜鉛,ジ
ノニルフェニルジチオリン酸亜鉛,ジドデシルフェニル
ジチオリン酸亜鉛,ジトリルジチオリン酸亜鉛などが挙
げられる。これらのジチオリン酸亜鉛は一種用いてもよ
いし、二種以上を組合わせて用いてもよく、また、その
含有量は該組成物全重量に基づき0.2〜1重量%の範囲
で選ばれる。この含有量が0.2重量%未満では耐摩耗
性,耐熱性,水分離性の向上効果が十分に発揮されない
し、1重量%を超えると水分離性が低下する傾向がみら
れる。本発明の組成物において、(C)成分として用い
られるサリチル酸のアルカリ土類金属塩としては、一般
[In the formula, R 1 , R 2 , R 3 and R 4 are each a primary or secondary alkyl group, an aryl group or an aralkyl group, and they may be the same or different, but the total carbon The number is 4-80. ] The compound represented by these can be mentioned. Specific examples of such compounds include zinc dihexyldithiophosphate, zinc dioctyldithiophosphate, zinc dinonyldithiophosphate, zinc didecyldithiophosphate, zinc didodecyldithiophosphate, zinc dinonylphenyldithiophosphate, zinc didodecylphenyldithiophosphate. , Zinc ditolyldithiophosphate and the like. These zinc dithiophosphates may be used alone or in combination of two or more, and the content thereof is selected in the range of 0.2 to 1% by weight based on the total weight of the composition. .. If the content is less than 0.2% by weight, the effects of improving the wear resistance, heat resistance and water separability are not sufficiently exhibited, and if it exceeds 1% by weight, the water separability tends to decrease. In the composition of the present invention, the alkaline earth metal salt of salicylic acid used as the component (C) has a general formula

【0008】[0008]

【化2】 [Chemical 2]

【0009】〔式中、R5 及びR6 は少なくとも一方が
炭素数6〜50のアルキル基で、残りが水素原子又は炭
素数6〜50のアルキル基であり、Mはカルシウム,マ
グネシウム,バリウムなどのアルカリ土類金属であ
る。〕で表わされる化合物を挙げることができるが、特
に、塩基価が50〜400mgKOH/gのものが好適
である。前記サリチル酸のアルカリ土類金属塩の具体例
としてはオクチルサリチル酸カルシウム塩,ノニルサリ
チル酸カルシウム塩,ドデシルサリチル酸カルシウム
塩,ジ(ヘキシル)サリチル酸カルシウム塩,ペンタデ
シルサリチル酸カルシウム塩,オクタデシルサリチル酸
カルシウム塩などのモノ又はジアルキルサリチル酸のカ
ルシウム塩が好ましく挙げられる。これらのサリチル酸
のアルカリ土類金属塩は、一種用いてもよいし、二種以
上を組合わせて用いてもよく、また、その含有量は該組
成物全重量に基づき0.2〜1重量%の範囲で選ばれる。
この含有量が0.2重量%未満では耐熱性が著しく劣る
し、1重量%を超えると水分離性の低下が大きくなる傾
向がみられる。また、本発明の組成物においては、前記
(B)成分と(C)成分との合計含有量は1.8重量%以
下であることが好ましい。この含有量が1.8重量%を超
えると水分離性が低下する場合がある。
[In the formula, at least one of R 5 and R 6 is an alkyl group having 6 to 50 carbon atoms, the rest is a hydrogen atom or an alkyl group having 6 to 50 carbon atoms, and M is calcium, magnesium, barium, etc. Is an alkaline earth metal. ] A compound having a base number of 50 to 400 mgKOH / g is particularly preferable. Specific examples of the alkaline earth metal salt of salicylic acid include octylsalicylic acid calcium salt, nonylsalicylic acid calcium salt, dodecylsalicylic acid calcium salt, di (hexyl) salicylic acid calcium salt, pentadecylsalicylic acid calcium salt, octadecylsalicylic acid calcium salt, or the like. A calcium salt of dialkyl salicylic acid is preferred. These alkaline earth metal salts of salicylic acid may be used alone or in combination of two or more, and the content thereof is 0.2 to 1% by weight based on the total weight of the composition. It is selected in the range of.
If this content is less than 0.2% by weight, the heat resistance will be remarkably inferior, and if it exceeds 1% by weight, the water separability will tend to decrease significantly. Further, in the composition of the present invention, the total content of the component (B) and the component (C) is preferably 1.8% by weight or less. If this content exceeds 1.8% by weight, the water separability may deteriorate.

【0010】本発明の組成物においては、(D)成分と
して水分離剤が用いられる。この水分離剤については特
に制限はなく、従来作動油に慣用されている水分離剤を
用いることができるが、非イオン性化合物が好ましく、
特に一般式
In the composition of the present invention, a water separating agent is used as the component (D). The water separating agent is not particularly limited, and a water separating agent conventionally used for hydraulic fluids can be used, but a nonionic compound is preferable,
Especially the general formula

【0011】[0011]

【化3】 [Chemical 3]

【0012】〔式中、R7 は炭素数4〜18のアルキル
基、アリール基又はアラルキル基、nは1〜8の整数で
ある。〕で表わされる化合物が好適である。このような
化合物の具体例としては、ポリオキシエチレンオクチル
エーテル,ポリオキシエチレンノニルエーテル,ポリオ
キシエチレンデシルエーテル,ポリオキシエチレンラウ
リルエーテル,ポリオキシエチレンパルミチルエーテ
ル,ポリオキシエチレンステアリルエーテル,ポリオキ
シエチレンフェニルエーテル,ポリオキシエチレンオク
チルエーテル,ポリオキシエチレンノニルフェニルエー
テルなどが挙げられる。これらの水分離剤は一種用いて
もよいし、二種以上を組合わせて用いてもよく、また、
その含有量は組成物の全重量に基づき0.01〜0.5重量
%の範囲で選ばれる。この量が0.01重量%未満では水
分離剤としての効果が十分に発揮されないし、0.5重量
%を超えると作動油に濁りが生じる。
[In the formula, R 7 is an alkyl group having 4 to 18 carbon atoms, an aryl group or an aralkyl group, and n is an integer of 1 to 8. ] The compound represented by these is suitable. Specific examples of such compounds include polyoxyethylene octyl ether, polyoxyethylene nonyl ether, polyoxyethylene decyl ether, polyoxyethylene lauryl ether, polyoxyethylene palmityl ether, polyoxyethylene stearyl ether, polyoxyethylene. Examples thereof include phenyl ether, polyoxyethylene octyl ether, and polyoxyethylene nonylphenyl ether. These water separating agents may be used alone, or may be used in combination of two or more kinds,
Its content is selected in the range of 0.01 to 0.5% by weight, based on the total weight of the composition. If this amount is less than 0.01% by weight, the effect as a water separating agent is not sufficiently exhibited, and if it exceeds 0.5% by weight, the hydraulic oil becomes turbid.

【0013】本発明の作動油組成物には、所望に応じ、
本発明の目的が損なわれない範囲で、(E)成分として
従来作動油に慣用されている他の添加剤、例えば防錆
剤,酸化防止剤,消泡剤などを添加することができる。
該防錆剤としては、例えば石油スルホン酸,ジノニルナ
フタレンスルホン酸,重質アルキルベンゼンスルホン酸
などのスルホン酸のアルカリ金属塩やアルカリ土類金属
塩のようなスルホネートや、アルキル又はアルケニルコ
ハク酸の部分エステルなどが好ましく用いられる。ま
た、酸化防止剤としては、例えばフェノール系やアミン
系のものが挙げられる。消泡剤としては、シリコーンオ
イル,金属石ケン,エステル類,シリケートなどが挙げ
られる。
The hydraulic oil composition of the present invention may optionally contain
As long as the object of the present invention is not impaired, as the component (E), other additives conventionally used in hydraulic oils, such as rust preventives, antioxidants and defoamers, can be added.
Examples of the rust preventive agent include sulfonates such as alkali metal salts and alkaline earth metal salts of sulfonic acids such as petroleum sulfonic acid, dinonylnaphthalene sulfonic acid, and heavy alkylbenzene sulfonic acid, and alkyl or alkenyl succinic acid moieties. Esters and the like are preferably used. Further, examples of the antioxidant include phenol-based and amine-based antioxidants. Examples of the defoaming agent include silicone oil, metal soap, esters, and silicate.

【0014】[0014]

【実施例】次に実施例により本発明をさらに詳細に説明
するが、本発明はこれらの例によってなんら限定される
ものではない。なお、作動油組成物の外観及び性能は次
のようにして求めた。 (1)色相(ASTM) JIS K−2580に準じて求めた。 (2)水分離性 JIS K−2520に準じて、乳化相が3ミリリット
ル以下になる時間(分)を求めた。 (3)耐摩耗性 ASTM D−2783に準じて、1200rpm,3
0kgf,30分の条件で摩耗試験を行い、摩耗痕径を
測定した。 (4)耐熱性 JIS K−2540の潤滑油熱安定試験法に準じて、
170℃で48時間熱劣化試験を行ったのちの性能を求
めた。 (5)錆止め性 JIS K−2510 2.5.1法に準じて求めた。
The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The appearance and performance of the hydraulic oil composition were determined as follows. (1) Hue (ASTM) Obtained according to JIS K-2580. (2) Water Separability According to JIS K-2520, the time (minute) for which the emulsified phase was 3 ml or less was determined. (3) Wear resistance According to ASTM D-2783, 1200 rpm, 3
A wear test was performed under conditions of 0 kgf and 30 minutes to measure the wear scar diameter. (4) Heat resistance In accordance with the JIS K-2540 lubricating oil thermal stability test method,
The performance was determined after conducting a heat deterioration test at 170 ° C. for 48 hours. (5) Rust prevention property It was determined according to JIS K-2510 2.5.1 method.

【0015】実施例1,2及び比較例1〜6 第1表に示す組成の作動油組成物を調製し、その性能を
評価した。その結果を第1表に示す。
Examples 1 and 2 and Comparative Examples 1 to 6 Hydraulic oil compositions having the compositions shown in Table 1 were prepared and their performances were evaluated. The results are shown in Table 1.

【0016】[0016]

【表1】 [Table 1]

【0017】[0017]

【表2】 [Table 2]

【0018】[0018]

【表3】 [Table 3]

【0019】注1)水添精製鉱油(40℃の動粘度46
cSt,S分3ppm以下,%CA 1以下,N分5pp
m,色(ASTM)L0.5) 2)溶剤精製鉱油(40℃の動粘度46cSt,S分1
500ppm以下,%CA 5以下,N分30ppm,色
(ASTM)L0.5) 3)Zn−ジオクチル−ジチオホスフェート 4)塩基価180mgKOH/g 5)塩基価300mgKOH/g 6)ポリオキシエチレン(4モル付加)オクチルエーテ
ル 7)Ca−スルホネート(塩基価20mgKOH/g)
Note 1) Hydrogenated refined mineral oil (kinematic viscosity at 40 ° C. 46
cSt, S content 3 ppm or less,% C A 1 or less, N content 5 pp
m, color (ASTM) L0.5) 2) Solvent refined mineral oil (kinematic viscosity at 40 ° C. 46 cSt, S content 1
500ppm or less,% C A 5 or less, N content 30 ppm, color (ASTM) L0.5) 3) Zn- dioctyl - dithiophosphate 4) base number 180 mg KOH / g 5) base number 300 mgKOH / g 6) Polyoxyethylene (4 Molar addition) Octyl ether 7) Ca-sulfonate (base number 20 mg KOH / g)

【0020】[0020]

【発明の効果】本発明の耐熱性作動油組成物は、耐熱性
及び耐摩耗性に優れ、高温雰囲気下で使用してもスラッ
ジを発生せず、かつ水分離性が良好であって、高出力の
油圧装置の作動油、例えば建設機械,射出成形機,ダイ
キャストマシンなどの油圧駆動機械用潤滑油などとして
好適に用いられる。
EFFECTS OF THE INVENTION The heat-resistant hydraulic oil composition of the present invention has excellent heat resistance and wear resistance, does not generate sludge even when used in a high temperature atmosphere, has good water separation property, It is preferably used as hydraulic oil for an output hydraulic device, for example, lubricating oil for hydraulically driven machines such as construction machines, injection molding machines, and die cast machines.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 C10M 129:16 105:04) C10N 10:04 20:00 Z 8217−4H A 8217−4H 30:00 B 8217−4H 30:06 30:08 40:08 (72)発明者 山田 寿夫 千葉県市原市姉崎海岸24番地4 出光興産 株式会社内 (72)発明者 弟子丸 順一 千葉県市原市姉崎海岸24番地4 出光興産 株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C10M 129: 16 105: 04) C10N 10:04 20:00 Z 8217-4H A 8217-4H 30: 00 B 8217-4H 30:06 30:08 40:08 (72) Inventor Toshio Yamada 24 No. 4 Anesaki Coast, Ichihara City, Chiba Prefecture 4 Idemitsu Kosan Co., Ltd. (72) Junichi Teshimaru 24 Anezaki Coast, Ichihara City, Chiba Prefecture 4 Idemitsu Kosan Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 (A)硫黄分100ppm以下の基油
と、組成物全重量に基づき、(B)ジチオリン酸亜鉛0.
2〜1重量%,(C)サリチル酸のアルカリ土類金属塩
0.2〜1重量%及び(D)水分離剤0.01〜0.5重量%
とを含有することを特徴とする耐熱作動油組成物。
1. Based on (A) a base oil having a sulfur content of 100 ppm or less and (B) zinc dithiophosphate based on the total weight of the composition.
2-1% by weight, (C) alkaline earth metal salt of salicylic acid
0.2-1% by weight and (D) water separating agent 0.01-0.5% by weight
A heat-resistant hydraulic oil composition comprising:
JP11279892A 1992-05-01 1992-05-01 Heat resistant hydraulic oil composition Expired - Fee Related JP3151784B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11323374A (en) * 1998-05-22 1999-11-26 Kubota Corp Hydraulic oil not-withering plants
JP2002542378A (en) * 1999-04-14 2002-12-10 シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイ Hydraulic fluid
WO2004013263A1 (en) * 2002-08-05 2004-02-12 Nippon Oil Corporation Lubricating oil composition
WO2010014833A2 (en) 2008-07-31 2010-02-04 Chevron Oronite S.A. Antiwear hydraulic fluid composition with useful emulsifying and rust prevention properties
JP2014218625A (en) * 2013-05-10 2014-11-20 コスモ石油ルブリカンツ株式会社 Hydraulic oil composition for construction machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11323374A (en) * 1998-05-22 1999-11-26 Kubota Corp Hydraulic oil not-withering plants
JP2002542378A (en) * 1999-04-14 2002-12-10 シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイ Hydraulic fluid
WO2004013263A1 (en) * 2002-08-05 2004-02-12 Nippon Oil Corporation Lubricating oil composition
US7563751B2 (en) 2002-08-05 2009-07-21 Nippon Oil Corporation Lubricating oil composition
US8765649B2 (en) 2002-08-05 2014-07-01 Nippon Oil Corporation Lubricating oil composition
WO2010014833A2 (en) 2008-07-31 2010-02-04 Chevron Oronite S.A. Antiwear hydraulic fluid composition with useful emulsifying and rust prevention properties
EP2307532A2 (en) * 2008-07-31 2011-04-13 Chevron Oronite S.A. Antiwear hydraulic fluid composition with useful emulsifying and rust prevention properties
EP2307532B1 (en) * 2008-07-31 2013-08-21 Chevron Oronite S.A. Use as an antiwear hydraulic fluid composition
JP2014218625A (en) * 2013-05-10 2014-11-20 コスモ石油ルブリカンツ株式会社 Hydraulic oil composition for construction machine

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