KR20010066191A - 자동차용 브레이크액 조성물 - Google Patents
자동차용 브레이크액 조성물 Download PDFInfo
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- KR20010066191A KR20010066191A KR1019990067779A KR19990067779A KR20010066191A KR 20010066191 A KR20010066191 A KR 20010066191A KR 1019990067779 A KR1019990067779 A KR 1019990067779A KR 19990067779 A KR19990067779 A KR 19990067779A KR 20010066191 A KR20010066191 A KR 20010066191A
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- weight
- brake fluid
- fluid composition
- metal corrosion
- corrosion inhibitor
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Abstract
본 발명은 혼합 용제, 금속 부식방지제, 및 산화방지제가 함유된 자동차용 브레이크액 조성물에 관한 것으로, 더욱 상세하게는 자동차용 브레이크액 조성물에 있어서, 상기 혼합 용제로서 글리콜 에테르 화합물 70 ∼ 80 중량%와 보론 에스터 화합물 18 ∼ 28 중량%, 및 실란계 안정제 0.8 ∼ 1.2 중량%가 함유됨으로써, 비점, 내부식성 및 증발성이 향상되고 브레이크액의 교환주기가 연장되는 자동차용 브레이크액 조성물에 관한 것이다.
Description
본 발명은 혼합 용제, 금속 부식방지제, 및 산화방지제가 함유된 자동차용 브레이크액 조성물에 관한 것으로, 더욱 상세하게는 자동차용 브레이크액 조성물에 있어서, 상기 혼합 용제로서 글리콜 에테르 화합물 70 ∼ 80 중량%와 보론 에스터 화합물 18 ∼ 28 중량%, 및 실란계 안정제 0.8 ∼ 1.2 중량%가 함유됨으로써, 비점, 내부식성 및 증발성이 향상되고 브레이크액의 교환주기가 연장되는 자동차용 브레이크액 조성물에 관한 것이다.
종래에 사용되는 브레이크액의 경우 용제로서 글리콜 에테르 화합물만 사용된 DOT-3 타입 및 용제에 보론 에스터 화합물이 약 30 ∼ 50 중량% 첨가된 DOT-4 타입 및 DOT-5-1 타입 등이 주로 사용되고 있다. 상기 DOT-3 타입의 브레이크액은 장시간 사용시 대기중의 수분을 흡수하여 습윤 비점(wet boiling point)이 낮아지면서 증기 폐쇄(vapor lock)현상을 야기시켜 제동불능 사고를 일으킬 위험이 있고, 금속 부식방지 능력이 약한 단점이 있다.
또한, 상기 DOT-4 타입 및 DOT-5-1 타입의 브레이크액은 보론 에스터 화합물을 사용함으로써 평형환류 끓는점(equilibrium reflux boiling point)과 습윤 비점(wet boling point)이 높아 상기 DOT-3 타입에 비해 안전도가 높다. 그러나, 수분 흡습시 보론 에스터 화합물의 가수분해로 인한 보론산의 석출로 주변 금속 부품을 부식시키고, 제조원가가 고가인 단점을 지니고 있다.
현재 유럽 및 일본 등 자동차 기술 선진국에는 안전도가 높고 수명이 긴 DOT-4 타입 및 DOT-5-1을 적용되어 사용 중에 있으며, 제조 원가를 낮추기 위한 연구가 진행중이다.
따라서, 본 발명은 기존의 DOT-3 타입에서 사용하지 않는 고가의 보론 에스터 화합물 및 실란계 안정제를 첨가함으로써, 제조원가를 낮추고 수분 흡습시 가수분해되어 보론산이 석출되는 문제점을 개선하고 브레이크 제동 성능의 향상 및 기능상 트러블을 억제시킴으로 브레이크액의 교환주기가 연장된 자동차용 브레이크액 조성물을 제공하는데 그 목적이 있다.
본 발명은 혼합 용제, 금속 부식방지제, 및 산화방지제가 함유된 자동차용 브레이크액 조성물에 있어서, 상기 혼합 용제로서 글리콜 에테르 화합물 70 ∼ 80 중량%와 보론 에스터 화합물 18 ∼ 28 중량%, 및 실란계 안정제 0.8 ∼ 1.2 중량%가 함유되어 있는 자동차용 브레이크액 조성물을 그 특징으로 한다.
이와 같은 본 발명을 더욱 상세하게 설명하면 다음과 같다.
본 발명은 자동차용 브레이크액 조성물에 있어서, 용제로서 보론 에스터 화합물을 함유시키고, 보론 에스터 화합물의 보론산의 석출을 방지하기 위하여 실란계 안정제를 사용함으로써, 금속 부식방지 성능이 강화되어 브레이크액의 교환주기가 연장되는 자동차용 브레이크액 조성물을 그 특징으로 한다.
본 발명에서 사용되는 용제는 대기중의 수분 흡습량이 적고, 흡습 비점(wet boiling point)이 높고, 부품의 윤활 작용을 원활히 할 수 있어야 하므로, 글리콜 에테르 화합물 및 보론 에스터 화합물을 적당량의 비율로 선택하여 첨가하게 된다. 본 발명에서 상기 글리콜 에테르 화합물은 트리에틸렌글리콜 모노메틸에테르, 폴리알킬렌글리콜, 폴리에틸렌프로필렌글리콜 모노메틸에테르, 및 폴리에틸렌 모노부틸에테르를 혼합하여 사용한다.
구체적으로, 본 발명에서 용제로 사용되는 트리에틸렌글리콜 모노메틸에테르는의 함량은 전체 브레이크액 조성에 대하여 20 ∼ 30 중량%로 첨가된다.
본 발명에서 용제로 사용되는 폴리알킬렌글리콜을 브레이크 시스템의 실린더 및 피스톤에서 윤활작용을 원활하게 하기 위하여 첨가된다. 본 발명의 폴리알킬렌글리콜은 중량 평균 분자량 700 ∼ 4000으로, 그 함량은 전체 브레이크액 조성에 대하여 5 ∼ 10 중량%로 첨가된다. 이때, 상기 폴리알킬렌글리콜의 함량이 5 중량% 미만이면 브레이크 시스템에서 윤활작용을 원활히 하지 못하고, 10 중량%가 초과되면 어는점이 높아 점도의 증가 및 제조원가가 상승되어 바람직하지 못하다.
본 발명에서 용제로 사용되는 폴리에틸렌 모노부틸에테르의 함량은 전체 브레이크액 조성에 대하여 20 ∼ 30 중량%로 첨가된다.
본 발명에서 용제로 사용되는 폴리에틸렌프로필렌글리콜 모노메틸에테르는 다른 브레이크 용제보다 대기중의 수분을 흡습하는 양이 현저히 작으면서도 흡습비점이 높은 특징을 가지고 있다. 본 발명의 폴리에틸렌프로필렌글리콜 모노메틸에테르의 함량은 전체 브레이크액 조성에 대하여 15 ∼ 30 중량%로 첨가된다.
특히, 본 발명에서 용제로 사용되는 보론 에스터 화합물은 브레이크액 조성물의 함량은 전체 브레이크액 조성에 대하여 18 ∼ 28 중량%로 첨가된다. 이때, 상기 보론 에스터 함량이 18 중량% 미만이면 원하는 물성을 얻기 힘들고, 28 중량%가 초과되면 제조원가 상승 및 보론산이 석출되어 주변 부품의 부식이 야기되어 바람직하지 못하다.
또한, 본 발명에서 사용되는 금속 부식방지제는 금속 부품의 부식방지 및 무게 변화량을 줄이기 위하여 첨가되고, 통상적인 것으로 포스페이트계, 트리아졸계, 및 아민계 화합물을 혼합하여 사용한다. 본 발명의 금속 부식방지제 상기 화합물로 전체 브레이크액 조성에 대하여 1.0 ∼ 2.1 중량% 첨가된다. 본 발명에서 상기 포스페이트계 금속 부식방지제의 함량은 전체 금속부식방지제 조성에 대하여 0.5 ∼ 1.0 중량%로, 이때 함량이 0.5 중량% 미만이면 아연 금속 부식 또는 무게 변화량의 우려가 있고, 1.0 중량%가 초과되면 아연 금속 부식 및 동계 금속의 무게 변화량이 크게 늘어날 염려가 있어서 바람직하지 못하다. 그리고, 포스페이트계 금속 부식방지제로는 주로 트리페닐 포스페이트가 바람직하게 사용된다.또한, 본 발명에서 상기 트리아졸계 및 아민계 금속 부식방지제는 방청 효과를 증가시키기 위하여 첨가되며, 통상적으로 트리아졸계 0.2 ∼ 0.5 중량% 및 아민계 0.3 ∼ 0.6 중량%가 사용된다.
본 발명에서 사용하는 산화방지제는 용제의 알킬기의 산화방지를 위하여 첨가되고, 그 함량은 전체 자동차 브레이크액 조성물에 대하여 0.3 ∼ 0.6 중량%로, 이때 함량이 0.3 중량% 미만이면 산화방지 성능이 저하되고, 0.6 중량%가 초과되면 더 이상 산화방지능이 증가하지 않는다. 본 발명에서 산화방지제로는 바람직하게 디부틸하이드록시톨루엔이 사용된다.
특히, 본 발명에서 사용하는 실란계 안정제는 용제로 사용되는 보론 에스터 화합물이 수분을 흡습한 경우 가수분해되어 보론산 결정의 석출로 인한 금속 부품의 부식을 억제하기 위하여 첨가하게 된다. 본 발명의 실란계 안정제로서 통상적으로 사용되는 실란계 안정제를 사용하고, 그 함량은 전체 자동차 브레이크액 조성물에 대하여 0.3 ∼ 0.6 중량%로 첨가된다. 이때 , 그 함량이 0.3 중량% 미만이면 보론산이 석출되고, 0.6 중량%가 초과되면 금속 부품을 부식시킴으로 바람직하지 못하게 된다. 본 발명에서 상기 실란계 안정제로는 바람직하게 3-디에탄올 아미노 프로필 실란을 사용한다.
이상과 같이, 본 발명에 따른 브레이크액 조성물은 용제로서 글리콜 에테르 화합물 및 보론 에스터 화합물, 금속 부식방지제, 산화방지제 및 실란계 안정제의 함량을 새롭게 구성하여 제조 원가가 낮고 흡습 비점(wet boiling point)이 높으며 각종 금속의 부식방지 성능 향상으로 인한 브레이크액의 교환 수명 연장 효과를 얻을 수 있다.
이와 같은 본 발명을 실시예에 의거 상세히 설명하겠는 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.
실시예 1 ∼ 3 및 비교예
다음 표 1의 조성에 따라 통상적인 방법으로 실시예 1 ∼ 3 및 비교예의 브레이크액 조성물을 제조하였다(30 ℃에서 1시간 교반).
이후 제조된 브레이크액 조성물의 제조원가를 비교하고, 다음의 시험 방법에 따라 물성을 측정하였다.
[측정 방법]
1. 특수금속부식시험(㎎/㎠)
KS M 2142부동액 시험장치에 각각의 브레이크액을 넣고 온도를 100℃ 로 조절한 다음 표준 시험편을 240시간 침지시켰다. 이때 산소를 높여 부식을 촉진시키기 위해 공기를 분당 100㎖씩 주입하면서 측정하였다.
2. 증발성 시험(%)
KS M 2141 자동차용 비광유 브레이크액의 7.8항에 따라 시험하였다.
3. 습윤비점시험(℃)
KS M 2141 자동차용 비광유 브레이크액의 7.2항에 따라 시험하였다.
4. 보론산 석출시험
상기 증발성 시험 후 50℃, 450㎖ 물이 담긴 데시케이트속에 72시간 동안 방치시킨 후 보론산 석출을 손끝 또는 육안으로 관찰하였다.
조성(중량%) | 실시예 | 비교예 | |||
1 | 2 | 3 | |||
용제 | 폴리에틸렌글리콜 모노메틸 에테르1) | - | - | - | 20 |
트리에틸렌글리콜 모노메틸 에테르2) | 23 | 20 | 22 | 15 | |
폴리 알킬렌 글리콜3) | 6.8 | 2 | 7.8 | 8 | |
폴리에틸렌 모노부틸 에테르4) | 21 | 22 | 20 | 20 | |
폴리에틸렌프로필렌글리콜모노메틸에테르5) | 28 | 24 | 22 | - | |
보론 에스터 화합물6) | 19 | 23 | 25 | 36 | |
금속부식방지제 | 트리부틸포스페이트7) | 0.6 | 0.75 | 0.8 | - |
벤조트리아졸8) | 0.2 | 0.2 | 0.2 | 0.25 | |
톨리트리아졸9) | - | - | - | 0.1 | |
트리에탄올아민10) | 0.3 | 0.4 | 0.5 | - | |
시클로헥실아민11) | - | - | - | 0.25 | |
디부틸아민12) | - | - | - | 0.2 | |
산화방지제 | 디부틸하이드록시톨루엔13) | 0.3 | 0.45 | 0.55 | - |
비스페놀 A14) | - | - | - | 0.2 | |
실란계 안정제 | 3-디에탄올아미노프로필실란15) | 0.8 | 1.0 | 1.15 | - |
항목 | 규격 | 실시예 | 비교예 | |||
1 | 2 | 3 | ||||
특수 금속 부식 시험(㎎/㎠) | 주석판 | ±0.2 | 0.02 | 0.01 | 0.01 | 0.13 |
강 | ±0.2 | 0.01 | 0.02 | 0.02 | 0.24 | |
알루미늄 | ±0.1 | 0.03 | 0.02 | 0.02 | 0.28 | |
주철 | ±0.2 | 0.01 | 0.02 | 0.02 | 0.11 | |
황동 | ±0.4 | 0.04 | 0.06 | 0.07 | 0.24 | |
동 | ±0.4 | 0.08 | 0.09 | 0.08 | 0.26 | |
아연 | ±0.4 | 0.07 | 0.06 | 0.09 | 0.28 | |
증발성 시험 | 80%이하(3일) | 53% | 52% | 49% | 57% | |
습윤비점 | 155℃이상 | 157℃ | 160℃ | 163℃ | 166℃ | |
보론산 석출시험 | 없음 | 없음 | 없음 | 석출 |
상기 실험 결과에 의해 실시예의 브레이크액 조성물은 비교예와 비교하면 내부식성 및 증발성이 우수하고 습윤 비점이 낮고 보론산 석출이 관찰되지 않았다.
또한, 비교예의 제조 원가를 100으로 기준하였을 때 실시예의 제조 원가가 79 ∼ 84로 제조 원가를 약 20% 낮추었다.
상술한 바와 같이 본 발명에 따른 글리콜 에테르 및 보론 에스터 화합물이 함유된 혼합 용제, 금속 부식방지제, 산화방지제 및 실란계 안정제가 함유된 브레이크액 조성물은 기존의 브레이크 액보다 대기중의 수분 흡습량이 20% 가량 적고, 낮은 습윤 비점을 나타내고 내부식성 및 증발성이 우수하여 브레이크액의 교환주기를 연장시키고 제조 원가 및 경비 절감에 효과적이다.
Claims (4)
- 혼합 용제, 금속 부식방지제, 및 산화방지제가 함유된 자동차용 브레이크액 조성물에 있어서, 상기 혼합 용제로서 글리콜 에테르 화합물 70 ∼ 80 중량%와 보론 에스터 화합물 18 ∼ 28 중량%, 및 실란계 안정제 0.8 ∼ 1.2 중량%가 함유되어 있는 것임을 특징으로 하는 자동차용 브레이크액 조성물.
- 제 1 항에 있어서, 상기 글리콜 에테르 화합물은 트리에틸렌글리콜 모노메틸에테르 20 ∼ 30 중량%, 폴리알킬렌글리콜 5 ∼ 10 중량%, 폴리에틸렌프로필렌글리콜 모노메틸에테르 15 ∼ 30 중량%, 및 폴리에틸렌 모노부틸에테르 20 ∼ 30 중량%가 혼합되어 사용하는 것임을 특징으로 하는 자동차용 브레이크액 조성물.
- 제 1 항에 있어서, 상기 금속 부식방지제는 포스페이트계 금속 부식방지제 0.5 ∼ 1.0 중량%, 트리아졸계 금속 부식방지제 0.2 ∼ 0.5 중량%, 및 아민계 금속 부식방지제 0.2 ∼ 0.5 중량%가 혼합되어 사용하는 것임을 특징으로 하는 자동차용 브레이크액 조성물.
- 제 1 항에 있어서, 상기 산화방지제는 디부틸하이드록시를 사용하는 것임을 특징으로 하는 자동차용 브레이크액 조성물.
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KR1019990067779A KR100600100B1 (ko) | 1999-12-31 | 1999-12-31 | 자동차용 브레이크액 조성물 |
JP2000332969A JP3498164B2 (ja) | 1999-12-31 | 2000-10-31 | 自動車用のブレーキ液組成物 |
US09/705,758 US6339050B1 (en) | 1999-12-31 | 2000-11-06 | Brake fluid composition for an automobile |
DE10057440A DE10057440A1 (de) | 1999-12-31 | 2000-11-20 | Bremsflüssigkeitszusammensetzung für ein Automobil |
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KR20040023917A (ko) * | 2002-09-12 | 2004-03-20 | 현대자동차주식회사 | 자동차용 브레이크액 조성물 |
KR100792957B1 (ko) * | 2007-01-03 | 2008-01-08 | 조이섭 | 자동차용 브레이크액의 조성물 |
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US7951757B2 (en) | 2005-07-01 | 2011-05-31 | Dow Global Technologies Llc | Low viscosity functional fluids |
EP2205706A1 (en) * | 2007-10-15 | 2010-07-14 | Dow Global Technologies Inc. | Functional fluid composition for improving lubricity of a braking system |
US20110207636A1 (en) * | 2008-11-07 | 2011-08-25 | Jin Zhao | Low viscosity functional fluids |
CN102363735B (zh) * | 2010-12-14 | 2013-11-20 | 深圳车仆汽车用品发展有限公司 | 一种醇醚硼酸酯型dot4制动液的制备方法 |
KR101466146B1 (ko) * | 2011-11-04 | 2014-11-28 | 극동제연공업 주식회사 | 트리아졸과 티아디아졸을 포함하는 브레이크액 조성물 |
KR20130049292A (ko) * | 2011-11-04 | 2013-05-14 | 극동제연공업 주식회사 | 타르타릭산과 이미다졸을 포함하는 브레이크액 조성물 |
CN102604719B (zh) * | 2012-02-08 | 2013-06-12 | 无锡中石油润滑脂有限责任公司 | 一种机动车辆制动液及其制备方法 |
KR101679930B1 (ko) * | 2014-12-16 | 2016-11-25 | 현대자동차주식회사 | Osp를 함유하는 자동차용 브레이크액 조성물 |
WO2019245863A1 (en) * | 2018-06-18 | 2019-12-26 | Chemetall U.S., Inc. | Amine-functionalized organosilane / organophosphate combination systems as ep agents / corrosion inhibitors in compositions for treating metal surfaces |
DE102019008810A1 (de) | 2019-12-18 | 2020-08-06 | Daimler Ag | Vorrichtung zur Verringerung einer Korrosionsbelastung in Brems- und Hydrauliksystemen |
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GB1518669A (en) * | 1974-06-07 | 1978-07-19 | Ici Ltd | Hydraulic fluid compositions |
US3925223A (en) * | 1974-07-19 | 1975-12-09 | Union Carbide Corp | Hydraulic fluids based on borate esters |
US4141851A (en) * | 1975-11-21 | 1979-02-27 | Castrol Limited | Silane derivatives |
DE2804535C2 (de) * | 1978-02-03 | 1984-04-26 | Alfred Teves Gmbh, 6000 Frankfurt | Hydraulische Flüssigkeiten |
DE2945094A1 (de) * | 1979-11-08 | 1981-05-21 | Hoechst Ag, 6000 Frankfurt | Hydraulische fluessigkeit mit verbesserten eigenschaften |
JPH0711281A (ja) * | 1993-06-22 | 1995-01-13 | Toyota Motor Corp | ブレ−キ液組成物 |
DE19546856C1 (de) * | 1995-12-15 | 1997-06-26 | Hoechst Ag | Testverfahren für hydraulische Flüssigkeiten auf der Basis von Glykolen und Glykolborsäureestern bezüglich Niederschlagsneigung |
KR20040023917A (ko) * | 2002-09-12 | 2004-03-20 | 현대자동차주식회사 | 자동차용 브레이크액 조성물 |
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KR20040023917A (ko) * | 2002-09-12 | 2004-03-20 | 현대자동차주식회사 | 자동차용 브레이크액 조성물 |
KR100792957B1 (ko) * | 2007-01-03 | 2008-01-08 | 조이섭 | 자동차용 브레이크액의 조성물 |
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