KR100600100B1 - 자동차용 브레이크액 조성물 - Google Patents

자동차용 브레이크액 조성물 Download PDF

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KR100600100B1
KR100600100B1 KR1019990067779A KR19990067779A KR100600100B1 KR 100600100 B1 KR100600100 B1 KR 100600100B1 KR 1019990067779 A KR1019990067779 A KR 1019990067779A KR 19990067779 A KR19990067779 A KR 19990067779A KR 100600100 B1 KR100600100 B1 KR 100600100B1
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South Korea
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weight
brake fluid
fluid composition
automobiles
metal corrosion
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KR1019990067779A
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English (en)
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KR20010066191A (ko
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박주천
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현대자동차주식회사
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Priority to KR1019990067779A priority Critical patent/KR100600100B1/ko
Priority to JP2000332969A priority patent/JP3498164B2/ja
Priority to US09/705,758 priority patent/US6339050B1/en
Priority to DE10057440A priority patent/DE10057440A1/de
Publication of KR20010066191A publication Critical patent/KR20010066191A/ko
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Publication of KR100600100B1 publication Critical patent/KR100600100B1/ko

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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.
보론 에스터 화합물, 실란계 안정제

Description

자동차용 브레이크액 조성물{Brake solution for automobile}
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 화합물 을 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 ∼ 1.15 중량%가 함유되어 있는 자동차용 브레이크액 조성물에 그 특징이 있다.
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. 상기 글리콜 에테르 화합물은 전체 브레이크액 조성에 대하여 70 ∼ 80 중량% 사용되는 바, 상기 범위 미만이면 윤활효과 불량의 우려가 있고 범위를 벗어나는 경우에는 점도 상승의 우려가 있으므로 적절한 범위로 사용하는 것이 바람직하다.
구체적으로, 본 발명에서 용제로 사용되는 트리에틸렌글리콜 모노메틸에테르는의 함량은 전체 브레이크액 조성에 대하여 20 ∼ 30 중량%로 첨가된다. 상기 사용량을 벗어나는 경우 고점도화 및 증발감량의 과다 문제가 있다.
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. 상기 사용량이 범위를 벗어나는 고무 부품의 과대팽윤 또는 축소의 문제가 있다.
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. 사용량이 상기 범위 미만이면 그 양이 미미하여 습윤비점 상승의 효과를 얻을 수 없으며, 상기 범위를 초과하는 경우에는 보론산의 석출되는 문제가 있습니다.
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% 첨가되는 데 상기 범위 미만이면 금속부식의 우려가 있고 초과하는 경우에는 원가상승의 효과가 있다. 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. 상기 트리아졸계와 아민계 금속 부식 방지제의 사용량이 상기 범위 미만이면 그 양이 미미하여 금속부식의 우려가 있고, 범위를 초과하는 경우에는 효과 상승이 미비하여 비경제적인 문제가 있습니다.
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 0.8 ∼ 1.15 중량%로 첨가된다. 이때 , 그 함량이 0.8 중량% 미만이면 보론산이 석출되고, 1.15 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 얻 을 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 방 치시킨 후 보론산 석출을 손끝 또는 육안으로 관찰하였다.
조성(중량%) 실시예 비교예
1 2 3
용 제 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
금 속 부 식 방 지 제 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
산화 방지제 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)

  1. 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 ∼ 1.15 중량%가 함유되어 있는 것임을 특징으로 하는 자동차용 브레이크액 조성물.
  2. 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.
  3. 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.
  4. 제 1 항에 있어서, 상기 산화방지제는 디부틸하이드록시를 사용하는 것임을 특징으로 하는 자동차용 브레이크액 조성물.
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US09/705,758 US6339050B1 (en) 1999-12-31 2000-11-06 Brake fluid composition for an automobile
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KR20040023917A (ko) * 2002-09-12 2004-03-20 현대자동차주식회사 자동차용 브레이크액 조성물

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013065904A1 (ko) * 2011-11-04 2013-05-10 극동제연공업 주식회사 타르타릭산과 이미다졸을 포함하는 브레이크액 조성물
WO2013065903A1 (ko) * 2011-11-04 2013-05-10 극동제연공업 주식회사 트리아졸과 티아디아졸을 포함하는 브레이크액 조성물
KR101466146B1 (ko) * 2011-11-04 2014-11-28 극동제연공업 주식회사 트리아졸과 티아디아졸을 포함하는 브레이크액 조성물
US9175238B2 (en) 2011-11-04 2015-11-03 Kukdong Jeyen Company Limited Brake fluid composition comprising tartaric acid and imidazole
US9175239B2 (en) 2011-11-04 2015-11-03 Kukdong Jeyen Company Limited Brake fluid composition comprising triazole and thiadiazole

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US6339050B1 (en) 2002-01-15
JP3498164B2 (ja) 2004-02-16

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