KR0157643B1 - Fire resistant hydraulic fluid composition - Google Patents

Fire resistant hydraulic fluid composition Download PDF

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Publication number
KR0157643B1
KR0157643B1 KR1019930700584A KR930700584A KR0157643B1 KR 0157643 B1 KR0157643 B1 KR 0157643B1 KR 1019930700584 A KR1019930700584 A KR 1019930700584A KR 930700584 A KR930700584 A KR 930700584A KR 0157643 B1 KR0157643 B1 KR 0157643B1
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KR
South Korea
Prior art keywords
fluid
base fluid
alkylene
polyalkylene glycol
hydraulic fluid
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KR1019930700584A
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Korean (ko)
Inventor
알. 밀러 필립
Original Assignee
브루스 이. 버딕
올린 코포레이션
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Publication of KR0157643B1 publication Critical patent/KR0157643B1/en

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    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract

본 발명은 (a) 폴리알킬렌 글리콜 기본 유체 및 (b) 연무 방지 첨가제로서 분자량이 약 5,000 내지 약 100,000이며 기본 유체에 가용성인 알킬렌-비닐에스테르 공중합체를 포함하는 수압 유체 조성물에 관한 것이다. 또다른 양상에 있어서, 본 발명은 수압계에 상기한 바와 같은 수압 유체 조성물을 가함을 특징으로하여 수압계에 내화성 및 감소된 마멸 특성을 제공하는 방법에 관한 것이다.The present invention relates to a hydraulic fluid composition comprising (a) a polyalkylene glycol base fluid and (b) an antifog additive and an alkylene-vinylester copolymer having a molecular weight of about 5,000 to about 100,000 and soluble in the base fluid. In another aspect, the present invention relates to a method of providing a hydraulic system with fire resistance and reduced wear characteristics, characterized by adding a hydraulic fluid composition as described above to the hydraulic system.

Description

내화성 작동액 조성물Fire Resistant Fluid Composition

본 발명은 일반적으로는 작동액(hydraulic fluid) 조성물, 더욱 구체적으로는 내화성 향상을 특징으로 하는 작동액에 관한 것이다.The present invention relates generally to hydraulic fluid compositions, and more particularly to hydraulic fluids characterized by improved fire resistance.

유체의 내화성에 대해 과거에는, 폴리알킬렌 글리콜계작동액은 일반적으로 팩토리 뮤추얼 리서치 그룹(Factory Mutual Research, Group) I에 의한 FM 허용기준(approval)이라고 하는 허용 기준 계열 번호 6930을 충족시키기에 충분한 내화도를 제공하기 위해 내부에 물을 포함해야 했다. 물은 여러 가지 이유, 가장 현저하게는 수증기압에 의한 압력 작업 제한 및 유압계의 금속 표면위에서 물에 의해 발생되는 부식문제점들로 인해 작동액의 첨가제로서 바람직하지 못하다.Regarding the fire resistance of the fluid, in the past, polyalkylene glycol-based working fluids were generally sufficient to meet the acceptance criteria series number 6930, called FM appropriation by Factory Mutual Research, Group I. Water had to be included inside to provide fire resistance. Water is undesirable as an additive to the working fluid due to various reasons, most notably the pressure working limitation due to water vapor pressure and the corrosion problems caused by water on the metal surface of the hydraulic system.

폴리알킬렌 글리콜계의 작동액에 수 첨가제를 사용하는 방법 대신에 폴리올 에스테르 유형의 유체(예 : 트리메틸올 프로판의 트리올레에이트 에스테르)는 FM 허용기준치를 제공하기 위해 고분자량의 중합체 연무방지 첨가제를 전형적으로 사용한다. 불행하게도, 이러한 연무방치 첨가제들은 사용도중 작동액에 의해 전형적으로 직면하게 되는 전단력에 노출되는 경우 분해되는 경향이 있다. 따라서, 이러한 선행 기술 분야의 연무방지 첨가제를 함유하는 작동액은 유효 수명이 수개월이하로 비교적 짧은 경향이 있으며 작동액이 사용될 특정 적용 분야가 필요로 하는 작업 조건 및 장치에 따라 달라진다. 또한, 폴리올 에스테르 유형의 윤활 기재 또한 특정 조건하에서 가수분해되기 쉬우며, 이는 작동액의 수행 특성을 변경시킬 수 있다.Instead of using water additives in polyalkylene glycol-based working fluids, fluids of the polyol ester type (e.g., trioleate esters of trimethylol propane) require high molecular weight polymer antifog additives to provide FM tolerances. Typically used. Unfortunately, such misting additives tend to degrade when exposed to shear forces typically encountered by the working fluid during use. Thus, working fluids containing such anti-fog additives in the prior art tend to be relatively short with a useful life of several months or less and depend on the operating conditions and the equipment required by the particular application in which the working fluid is to be used. In addition, lubricating substrates of the polyol ester type are also susceptible to hydrolysis under certain conditions, which can alter the performance characteristics of the working fluid.

전술한 바와 같은 면에서 보면, 작동액 제조업체들에게 내화성 및 전단 안정성이 함께 증진된 신규 비수성 작동액이 상당히 필요하게 될 것이다.In view of the foregoing, there will be a great need for hydraulic fluid manufacturers for new non-aqueous hydraulic fluids with enhanced fire and shear stability.

한 양상에 있어서, 본 발명은 폴리알킬렌 글리콜 기본 유체(a) 및 연무방지 첨가제로서 분자량이 약 5,000 내지 약 100,000(바람직하게는 10,000 내지 50,000)이며 기본 유체에 가용성인 알킬렌-비닐 에스테르 공중합체(b)를 포함하는 작동액 조성물에 관한 것이다.In one aspect, the present invention provides an alkylene-vinyl ester copolymer having a molecular weight of about 5,000 to about 100,000 (preferably 10,000 to 50,000) and being soluble in the base fluid as polyalkylene glycol base fluid (a) and antifog additive. It relates to a working fluid composition comprising (b).

또 다른 양상에 있어서, 본 발명은 폴리알킬렌 글리콜 기본 유체(a) 및 연무방지 참가제로서 분자량이 약 5,000 내지 약 100,000이며 기본 유체에 가용성인 알킬렌-비닐 에스테르 공중합체(b)를 포함하는 작동액 조성물을 유압계에 가함을 특징으로하여 유압계에 내화성, 가수분해에 대한 안정성 및 감소된 마멸 특성을 제공하는 방법에 관한 것이다.In another aspect, the invention comprises a polyalkylene glycol base fluid (a) and an alkylene-vinyl ester copolymer (b) having a molecular weight of about 5,000 to about 100,000 and being soluble in the base fluid as an antifog additive. A hydraulic fluid composition is applied to a hydraulic system to provide a hydraulic system with fire resistance, stability against hydrolysis and reduced wear characteristics.

이러한 양상 및 기타의 양상은 아래와 같은 본 발명에 대한 상세한 기술을 읽으면 명백해질 것이다.These and other aspects will become apparent upon reading the following detailed description of the invention.

본 발명에 다르면, 놀랍게도 사용기간 동안 마멸 방지 특성이 우수할 뿐만 아니라 내화성이 향상된 작동액 조성물이 제공될 수 있다는 사실이 밝혀졌다. 작동액은 폴리알킬렌 글리콜을 기본으로하여 폴리올 에스테르 유형의 작동액에 사용되는 연무방지제에 비해 전단안정성이 향상된 연무방지제를 함유한다.According to the present invention, it has surprisingly been found that a working fluid composition which is not only excellent in anti-wear properties during use but also improved in fire resistance can be provided. The hydraulic fluid contains an antifog agent based on polyalkylene glycol with improved shear stability as compared to the antifog agent used in the polyol ester type hydraulic fluid.

본 발명의 작동액의 기본 유체로서 유용한 폴리알킬렌 글리콜은 일반적으로 예를들어 저급 알칸올 개시제의 알칼리 금속염을 사용하여 음이온적으로 또는 양이온적으로 촉매된다. 이의 예시적인 예는 수산화칼륨에 의해 촉매되고 부탄올로 개시된 폴리알킬렌 글리콜이다. 모노올, 디올, 트리올 등을 포함하여 각종 폴리알킬렌 글리콜이 당해 기술분야에 널리 공지되어 각종 상표명하에, 예를들면 POLY-G[제조원 : 올린코포레이션(Olin Corporation)], UCON[제조원 : 유니온 카바이드 코포레이션(Union Carbide Corporation] 및 PLURACOL[제조원 : BASF 코포레이션]의 상표명으로 시판되고 있다.Polyalkylene glycols useful as basic fluids of the working fluids of the present invention are generally catalyzed anionic or cationic, for example using alkali metal salts of lower alkanol initiators. Illustrative examples thereof are polyalkylene glycols catalyzed by potassium hydroxide and initiated with butanol. Various polyalkylene glycols, including monools, diols, triols, and the like, are well known in the art and are known under various trade names, such as POLY-G [Olin Corporation], UCON [Union] Available under the trade names of Carbide Corporation and PLURACOL from BASF Corporation.

본 발명에 유용한 연무방지 첨가제는 분자량이 약 5,000 내지 약 100,000인 알킬렌-비닐 에스테르 공중합체(여기서, 알킬렌 화합물은 바람직하게는 에틸렌, 프로필렌, 부틸렌 및 이들의 혼합물로 이루어진 그룹으로부터 선택된다)이다. 공중합체는 공중합체중 비닐에스테르 그룹에 대한 알킬렌 그룹의 비가 약 1 : 10 내지 약 10 : 1인 랜덤 또는 블록 유형의 공중합체일 수 있으나, 단, 공중합체는 기본 유체에 가용성이어야 한다. 가장 바람직한 공중합체는 평셔날 프로덕츠 코포레이션(Functional Products Corporation)(소재지 : 오하이오주 클리브랜드)이 제조하여 상표명 V-152로서 시판하는 에틸렌-비닐 에스테르 공중합체이다. 공중합체는 적합하게는 예를들어 미합중국 특허 제3,254,063호 및 제3,591,502호에 기술된 바와 같은 에틸렌-비닐 에스테르 공중합 반응에 사용되는 공지된 기술을 사용하여 제조된다.Antifog additives useful in the present invention are alkylene-vinyl ester copolymers having a molecular weight of about 5,000 to about 100,000, wherein the alkylene compound is preferably selected from the group consisting of ethylene, propylene, butylene and mixtures thereof. to be. The copolymer may be a random or block type copolymer having a ratio of alkylene group to vinylester group in the copolymer of about 1: 10 to about 10: 1, provided that the copolymer is soluble in the base fluid. Most preferred copolymers are ethylene-vinyl ester copolymers manufactured by Functional Products Corporation (Cleveland, Ohio) and marketed under the trade name V-152. Copolymers are suitably prepared using known techniques used in ethylene-vinyl ester copolymerization reactions, for example as described in US Pat. Nos. 3,254,063 and 3,591,502.

예시적으로는, 알킬렌-비닐 에스테르 공중합체는 적합하게는 알킬렌 화합물(예 : 에틸렌, 프로필렌, 부틸렌 또는 이의 혼합물)을 공중합성 불포화 케톤과 공중합시켜 제조한다.By way of example, alkylene-vinyl ester copolymers are suitably prepared by copolymerizing alkylene compounds (eg ethylene, propylene, butylene or mixtures thereof) with copolymerizable unsaturated ketones.

적합한 케톤의 예에는 비닐 메틸 케톤, 비닐 n-옥틸 케톤, 비닐-이소옥틸 케톤, 비닐 도데실 케톤, 비닐-사이클로헥실 케톤, 3-펜텐-2-2온 및 이의 혼합물이 포함된다. 케톤에 대한 알킬렌 화합물의 몰%는 적합하게는 공중합체 제조에 사용되는 알킬렌 화합물과 케톤을 합한 총량을 기준으로하여 5 내지 80%이다.Examples of suitable ketones include vinyl methyl ketone, vinyl n-octyl ketone, vinyl-isooctyl ketone, vinyl dodecyl ketone, vinyl-cyclohexyl ketone, 3-penten-2-2one and mixtures thereof. The mole% of alkylene compound to ketone is suitably 5 to 80% based on the total amount of the alkylene compound and ketone used in the preparation of the copolymer.

본 발명에 따르는 작동액은 사용되는 연무방지제의 양은 작동액중 기본 유체와 연무방지 첨가제를 합한 총량을 기준으로하여 바람직하게는 약 01. 내지 약 20중량%, 보다 바람직하게는 약 0.5 내지 약 10중량%이다.The amount of the antifog agent used according to the present invention is preferably from about 01. to about 20% by weight, more preferably from about 0.5 to about 10, based on the total amount of the base fluid and the antifog additive in the fluid. Weight percent.

본 발명에 따르는 작동액은 비수성 또는 물을 사실상 함유되지 않는 유체이며, 이는 작동액이 작동액의 중량을 기준으로하여 5중량% 이하, 바람직하게는 2중량% 이하의 물을 함유함을 나타내고자 함이다.The hydraulic fluid according to the invention is a fluid which is substantially non-aqueous or water free, indicating that the hydraulic fluid contains up to 5% by weight, preferably up to 2% by weight, based on the weight of the working fluid. That's it.

본 발명의 조성물에 있어서, 목적하는 내화성 및 마멸방지 특성을 제공하기 위해 성분 (a) 및 성분 (b) 모두가 필수적으로 존재해야 한다. 또한, 추가의 임의의 첨가제를 목적하는 바에 따라 적합하게 사용할 수 있는데, 예를 들면 본 발명의 작동액은 일반적으로는 작동액 제형에 통상적으로 혼입되는 각종 유형의 첨가제와 방청제 및 산화 억제제, 부식 억제제, 금속 표면안정화제, 마멸방지제와 같은 윤활제를 포함하여 기타 특수 목적용 첨가제를 극소량으로, 전형적으로 약 0.01 내지 약 5.0중량%의 양으로 함유한다.In the compositions of the present invention, both component (a) and component (b) must be present essentially to provide the desired fire resistance and anti-wear properties. Further optional additives may be suitably used as desired, for example, the working fluids of the present invention are generally various types of additives commonly used in working fluid formulations, as well as rust inhibitors and oxidation inhibitors, corrosion inhibitors. And other special purpose additives, including lubricants such as metal surface stabilizers, antiwear agents, in minor amounts, typically in amounts of about 0.01 to about 5.0% by weight.

적합하게 사용되는 방청제 및 부식 억제제와 금속 표면 안정화제에는 톨릴트리아졸, 벤조티아졸 및 벤조트리아졸과 이의 유도체, 알킬 및 아릴 포스파이트 및 사코신 및 숙신산 유도체가 포함된다. 산화방지제에는 디알킬 티오디프로프리오네이트(예 : 디라우릴티오디프로프리오네이트등), 유기 아민(예 : 디옥틸 디페아닐민, 페닐나프틸아민, 장애된 페놀, 페노티아진등)이 포함된다. 마멸방지 첨가제에는 디티오포스페이트, 아민포스파이트, 유기 몰리브데늄 화합물, 포스포로티오네이트, 카바메이트등이 포함된다. 이러한 임의의 첨가제의 적합성은 작동액이 사용될 특정 적용분야가 필요로 하는 작업 조건 및 이에 대한 장치 조건에 따라 달라진다. 전술한 필요조건 외에, 존재해야 할 이들 각각의 성분과 이의 혼합물의 상대적 비율 및 최대량은 본 발명에 있어서 중요하지는 않다. 경제적 요인 또한 사용해야할 최적량의 결정을 좌우한다. 임의의 첨가제를 사용할 경우, 이는 적합하게는 작동액 총량을 기준으로하여 약 40중량% 이하의 양으로 사용된다.Suitable rust inhibitors and corrosion inhibitors and metal surface stabilizers include tolyltriazole, benzothiazole and benzotriazole and derivatives thereof, alkyl and aryl phosphites and sacosine and succinic acid derivatives. Antioxidants include dialkyl thiodipropionates (e.g. dilaurylthiodipropionate, etc.), organic amines (e.g. dioctyl difeanilamine, phenylnaphthylamine, hindered phenols, phenothiazines, etc.) do. Anti-wear additives include dithiophosphate, amine phosphite, organic molybdenum compounds, phosphorothionate, carbamate and the like. The suitability of any of these additives depends on the operating conditions and apparatus conditions for which the particular application in which the working fluid is to be used is required. In addition to the above requirements, the relative proportions and maximum amounts of each of these components and mixtures thereof to be present are not critical to the invention. Economic factors also determine the optimal amount to be used. When using any additive, it is suitably used in an amount of up to about 40% by weight based on the total amount of working fluid.

본 발명에 따르는 작동액 조성물은 바람직하게는 점도가 40℃에서 약 15 내지 약 3000cSt이다.The working fluid composition according to the invention preferably has a viscosity of about 15 to about 3000 cSt at 40 ° C.

아래 실시예는 본 발명을 예증하기 위함이며 이로써 제한하려는 것은 아니다.The following examples are intended to illustrate the invention and are not intended to be limiting.

작동액의 제조 및 이의 펌프 시험Preparation of working fluid and its pump test

본 발명의 범위에 속하는 작동액 조성물을 아래 배합물을 사용하여 아래 절차에 따라 제조한다.Working fluid compositions that fall within the scope of the present invention are prepared according to the following procedure using the formulations below.

비교용으로서, 이.에프.휴톤 코포레이션(E.F. Hughton Corporation, 소재지 : 필라델피아 밸리 포지)이 제조하여 코스모루브릭(Cosmolubric) HF130이라는 상표명으로 시판하는 폴리올 에스테르 작동액을 사용한다.For comparison, a polyol ester working solution manufactured by E.F.Hughton Corporation, Philadelphia Valley Forge, commercially available under the trade name Cosmolubric HF130 is used.

배합물에 대해서 ASTM-D2882에 따른 실험용 작동액 펌프 시험을 수행하여 특정 유체를 사용함으로써 발생되는 펌프의 마멸 정도를 측정한다. 이 시험은 간략하게는 아래와 같이 수행된다 :An experimental hydraulic fluid pump test according to ASTM-D2882 is performed on the formulation to determine the degree of wear of the pump resulting from the use of a specific fluid. This test is briefly performed as follows:

작동액 5gal을 100시간 동안 1200±60rpm의 펌프 속도 및 2000±40psi의 펌프 배출 압력에서 회전 날개 펌프 시스템을 통해 순환시킨다. 펌프 유입구에서의 유체 온도는 150±5℉이다. 그 결과, 시험 도중 캠 링 및 날개의 총중량 손실분이 12mg이다.5 gal of working fluid is circulated through the rotary vane pump system at a pump speed of 1200 ± 60 rpm and pump discharge pressure of 2000 ± 40 psi for 100 hours. The fluid temperature at the pump inlet is 150 ± 5 ° F. As a result, the total weight loss of the cam ring and the wing during the test is 12 mg.

수회의 펌프 마멸 시험을 수행하는 결과 손실분은 0.1 내지 10.0mg으로 나타났으며, 이는 이들 유체가 성능이 뛰어나게 우수한 작동액임을 나타낸다. 반면, 폴리올 에스테르 작동액 마멸에 의한 중량 손실의 양은 100시간의 마멸 시험 기간 동안 2.0 내지 15mg이다.The results of several pump wear tests resulted in a loss of 0.1 to 10.0 mg, indicating that these fluids are excellent performance fluids. On the other hand, the amount of weight loss due to abrasion of the polyol ester working fluid is 2.0-15 mg over a 100 hour wear test.

또한, 작동액의 내화성을 팩토리 뮤추얼 리서치, 그룹 Ⅱ에 의한 계열 번호 6930의 시험 절차에 따라 시험한다. 이 시험은 간략하게는 아래와 같이 수행된다 :The fire resistance of the working fluid is also tested in accordance with the test procedure of Serial No. 6930 by Factory Mutual Research, Group II. This test is briefly performed as follows:

유체 샘플을 강철 용기내에서 140℉로 가열한 후 질소를 사용하여 1000 psig로 가압한다. 샘플을 100psig에서 1.5gal/hr의 속도로 80℃의 중공의 원추형 HAGO 오일 버너 노즐로부터 개방된 공간으로 방출시킨다. 이 장치를 사용하여 아래 기술된 불꽃 전파(flame propagation) 시험 및 열 표면(hot surface) 시험을 수행한다 :The fluid sample is heated to 140 ° F. in a steel vessel and then pressurized to 1000 psig with nitrogen. The sample is discharged into an open space from a hollow conical HAGO oil burner nozzle at 80 ° C. at a rate of 1.5 gal / hr at 100 psig. Using this device, the flame propagation test and hot surface test described below are performed:

(불꽃 전파 시험)(Fireworks test)

프로판 토치를 노즐 팁으로부터 6in 및 18in 떨어진 지점에서 각각의 유체에 대한 분무 스프레이내로 도입시킨다. 각각의 지점에서 점화 시험을 10번 시도하여 유체 점화 시간을 재어서 기록한다. 10회의 시도 중에서 한 번이라도 점화가 5초를 초과하여 지속되는 경우 실패한 것으로 간주한다.Propane torch is introduced into the spray spray for each fluid at points 6 inches and 18 inches from the nozzle tip. Ten ignition tests are made at each point to record and record the fluid ignition time. If at least one of the ten trials lasts more than five seconds, it is considered to have failed.

(열 표면 점화시험)(Thermal surface ignition test)

수평면에 대해 30°로 경사지고 측면에 열막이가 장착된 강철 채널 철을 2개의 프로판 에어 버너를 사용하여 하부로부터 1300℉가 되도록 가열한다. 버너를 끈 후 유체를 6in 거리에서 60초 동안 방출시킨다. 점화가 일어나더라도 유체가 통과할 수 있으나, 스프레이가 뜨거운 표면으로부터 벗어날 때 화염이 따라가서는 안된다.The steel channel iron, which is inclined at 30 ° to the horizontal plane and fitted with heat shields on the sides, is heated to 1300 ° F from the bottom using two propane air burners. After the burner is turned off, the fluid is released for 60 seconds at a distance of 6 inches. Fluid may pass through the ignition, but the flames should not follow when the spray leaves the hot surface.

내화성 시험 결과 본 발명의 폴리알킬렌 글리콜 함유 조성물은 이 시험을 통과하였으며, 내화성 지속기간이 비교용 폴리올 에스테르 유형의 유체에 비해 3배 이상 더 연장된(펌프 시험에 있어서, 비교용 유체는 평균 8시간 미만인데 비해 본 발명에 따른 조성물은 평균 24시간임) 것으로 나타났다. 이는 ASTM D2882 펌프 시험 도중 2가지 유체의 정기적 샘플링을 기준으로 한 것이다. 펌프 스탠드 부품으로 사용된 장치에는 그 정도가 통상의 분야의 장치내에서는 경험할 수 없는 극심한 전단 조건을 야기시키는 압력 조절 밸브가 포함됨을 주목해야 한다. 또한, 이러한 내화성 시험을 전술한 바와 유사하되, 부탄올 개시된 폴리알킬렌 글리콜을 폴리프로필렌 글리콜 디올로 대체시킨 배합물에 대해서도 수행하였음을 주목한다. 또한 이러한 유사 배합물도 내화성 시험을 통과했다.Fire Resistance Test Results The polyalkylene glycol-containing compositions of the present invention passed this test, and the fire resistance duration was more than three times longer than that of the comparative polyol ester type fluid (in the pump test, the comparative fluid averaged 8 Compared to less than hour, the composition according to the invention averages 24 hours). This is based on periodic sampling of two fluids during the ASTM D2882 pump test. It should be noted that the device used as the pump stand component includes a pressure regulating valve, the extent of which causes extreme shear conditions not experienced in a device of ordinary skill. It is also noted that this fire resistance test was similar to that described above, but was also performed for the formulation in which butanol-initiated polyalkylene glycols were replaced with polypropylene glycol diols. These similar formulations also passed fire resistance tests.

또한, 유체를 GPC 분석하여 본 발명에 사용된 연무방지 첨가제의 분자량 손실을 비교용 유체에 사용된 첨가제와 비교하여 측정했다. 본 발명의 첨가제는 펌프내에서 시간이 경과함에 따라 분자량은 감소되었으나 시간 경과에 따른 작동액 배합물의 농도는 심하게 변화되지 않았다. 반면에, 비교용 유체는 펌프 시험 기간동안 시간이 경과함에 따라 펌프내 비교용 작동액의 분자량 및 농도 모두가 감소되었다.In addition, the fluid was GPC analyzed to determine the molecular weight loss of the antifog additive used in the present invention in comparison to the additive used in the comparative fluid. The additive of the present invention had a reduced molecular weight over time in the pump, but the concentration of the working fluid formulation did not change significantly over time. On the other hand, the comparative fluid decreased both the molecular weight and the concentration of the comparative working fluid in the pump over time during the pump test period.

Claims (4)

폴리알킬렌 글리콜 기본 유체(a)와 연무 방지 첨가제로서 분자량이 약 5,000 내지 약 100,000이며 기본 유체에 가용성인 알킬렌 비닐 에스테르 공중합체(b)를 포함하며 공중합체에서 비닐 에스테르 그룹에 대한 알킬렌 그룹의 비가 약 1 : 10 내지 약 10 : 1이고 연무 방지 첨가제가, 조성물 속의 연무 방지 첨가제와 기본 유체의 총량을 기준으로하여, 0.1 내지 20중량%의 양으로 존재하는 작동액 조성물을 유압계에 가함을 특징으로하여, 유압계에 내화성과 감소된 마멸 특성을 제공하는 방법.Polyalkylene glycol base fluid (a) and an antifog additive, comprising an alkylene vinyl ester copolymer (b) having a molecular weight of about 5,000 to about 100,000 and soluble in the base fluid, the alkylene group for the vinyl ester group in the copolymer The hydraulic fluid composition is applied to the hydraulic system in a ratio of about 1: 10 to about 10: 1 and the antifog additive is present in an amount of 0.1 to 20% by weight, based on the total amount of the antifog additive and the base fluid in the composition. Characterized by providing a hydraulic system with fire resistance and reduced wear characteristics. 제1항에 있어서, 폴리알킬렌 글리콜 기본 유체가 폴리알킬렌 글리콜, 폴리프로필렌 글리콜, 폴리부틸렌 글리콜 및 이들의 혼합물로 이루어진 그룹으로부터 선택됨을 특징으로 하는 방법.The method of claim 1 wherein the polyalkylene glycol base fluid is selected from the group consisting of polyalkylene glycols, polypropylene glycols, polybutylene glycols, and mixtures thereof. 제1항에 있어서, 알킬렌 비닐 에스테르 공중합체가 에틸렌, 프로필렌, 부틸렌 및 이들의 혼합물로 이루어진 그룹으로부터 선택되는 알킬렌 잔기를 사용함을 특징으로 하는 방법.The process of claim 1 wherein the alkylene vinyl ester copolymer uses an alkylene moiety selected from the group consisting of ethylene, propylene, butylene, and mixtures thereof. 제1항에 있어서, 폴리알킬렌 글리콜 기본 유체가 저급 알칸올 개시된 폴리알킬렌 글리콜임을 특징으로 하는 방법.The method of claim 1 wherein the polyalkylene glycol base fluid is a lower alkanol initiated polyalkylene glycol.
KR1019930700584A 1990-08-31 1991-08-06 Fire resistant hydraulic fluid composition KR0157643B1 (en)

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US57630190A 1990-08-31 1990-08-31
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