U.S. patent application number 15/874525 was filed with the patent office on 2019-05-30 for functional fluid compositions.
The applicant listed for this patent is Kukdong Jeyen Company Limited, Kukdong R&D Center. Invention is credited to Yong Hee HAN, Hong Ki LEE, Hyun Jin PARK, Jae Yoon PARK.
Application Number | 20190161700 15/874525 |
Document ID | / |
Family ID | 66634297 |
Filed Date | 2019-05-30 |
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United States Patent
Application |
20190161700 |
Kind Code |
A1 |
PARK; Jae Yoon ; et
al. |
May 30, 2019 |
FUNCTIONAL FLUID COMPOSITIONS
Abstract
The present invention relates to a functional fluid composition
comprising a glycol as a base material and a monoamine-based noise
reducer. According to the present invention as such, the functional
fluid composition comprising a glycol as a base material and a
monoamine-based noise reducer represented by chemical formula 1 has
an excellent noise reducing effect. In addition, the functional
fluid composition of the present invention has an excellent metal
corrosion inhibiting effect even, by using a monoamine-based
compound as a noise reducer, when a metal corrosion inhibitor
composed of a triazole-based compound without including an
amine-based compound is used as a metal corrosion inhibitor.
Inventors: |
PARK; Jae Yoon; (Seoul,
KR) ; PARK; Hyun Jin; (Seoul, KR) ; LEE; Hong
Ki; (Busan, KR) ; HAN; Yong Hee; (Busan,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kukdong Jeyen Company Limited
Kukdong R&D Center |
Busan
Busan |
|
KR
KR |
|
|
Family ID: |
66634297 |
Appl. No.: |
15/874525 |
Filed: |
January 18, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C10M 2207/0215 20130101;
C10M 169/044 20130101; C10M 133/44 20130101; C10M 161/00 20130101;
C10M 2215/04 20130101; C10N 2030/12 20130101; C10M 2217/06
20130101; C10M 149/14 20130101; C10M 2209/103 20130101; C10M
2227/0615 20130101; C10M 2209/104 20130101; C10M 2209/108 20130101;
C10M 105/14 20130101; C10N 2040/08 20130101; C10M 2215/30 20130101;
C10M 2207/026 20130101 |
International
Class: |
C10M 149/14 20060101
C10M149/14; C10M 105/14 20060101 C10M105/14; C10M 133/44 20060101
C10M133/44; C10M 161/00 20060101 C10M161/00; C10M 169/04 20060101
C10M169/04 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 30, 2017 |
KR |
10-2017-0163561 |
Claims
1. A functional fluid composition comprising a glycol as a base
material, the composition comprising a monoamine-based noise
reducer represented by chemical formula 1 below: ##STR00008##
wherein in chemical formula 1, X and Y are an integer of 1 or
greater; and R is H or CH.sub.3, the weight average molecular
weight of the compound represented by chemical formula 1 being 600
or more.
2. The functional fluid composition of claim 1, wherein the weight
average molecular weight of the compound represented by chemical
formula 1 is equal to or more than 600 and equal to or less than
2000.
3. The functional fluid composition of claim 1, wherein the
monoamine-based noise reducer of chemical formula 1 is comprised in
a content of 0.05-5.0 wt % based on the total weight of the
functional fluid composition.
4. The functional fluid composition of claim 1, wherein the
monoamine-based noise reducer of chemical formula 1 is comprised in
a content of 0.1-5.0 wt % based on the total weight of the
functional fluid composition.
5. The functional fluid composition of claim 1, wherein the
monoamine-based noise reducer of chemical formula 1 is comprised in
a content of 0.2-5.0 wt % based on the total weight of the
functional fluid composition.
6. The functional fluid composition of claim 1, wherein the
composition further comprises at least one additive selected from a
group consisting of a metal corrosion inhibitor and an
antioxidant.
7. The functional fluid composition of claim 6, wherein the metal
corrosion inhibitor is a triazole-based metal corrosion inhibitor
and does not comprise an amine-based metal corrosion inhibitor.
Description
TECHNICAL FIELD
[0001] The present invention relates to a functional fluid
composition and, more specifically, to a functional fluid
composition having a glycol as a base material and a
monoamine-based noise reducer.
BACKGROUND ART
[0002] The present invention relates to a functional fluid
composition useful as a brake fluid. As typical automotive brake
fluids, type 3 (DOT-3) brake fluid employing only a glycol ether
compound as a solvent and type 4 (DOT-4) brake fluid having about
30-60 wt % of a boron ester compound further added to the type 3
(DOT-3) brake fluid are mainly used. The DOT-3 type brake fluid
employs only a glycol ether compound, which is a low-molecular
weight material, and thus the DOT-3 type brake fluid, when used for
a long period of time, absorbs moisture in the air to lower the wet
boiling point thereof, thereby causing a vapor lock phenomenon, so
that there is a danger of causing a braking accident. Moreover, the
DOT-3 type brake fluid has weak metal corrosion inhibiting ability
over a long period of time. In addition, the DOT-4 type brake fluid
employs a boron ester compound to increase the equilibrium reflux
boiling point and the wet boiling point thereof, and thus the DOT-4
type brake fluid has a higher degree of safety compared with the
DOT-3 type brake fluid. However, the DOT-4 type brake fluid has
problems in that a boron ester-based compound is brought into
contact with moisture to cause hydrolysis, so that boric acid is
precipitated, causing the deterioration in physical properties of
the brake fluid and the generation of foreign materials.
[0003] Therefore, the DOT-4 type brake fluid is used while an amine
or silane-based type stabilizer is added to prevent the
precipitation of boric acid (Korean Patent Publication No.
10-2004-0023917). However, the addition of such a stabilizer causes
a significant increase in noise when a master cylinder in the brake
apparatus is operated.
[0004] In addition, Japanese Patent Publication No. 2013-227380
discloses that a brake fluid containing a fluoride compound has a
stick slip preventing effect through the improvement of
lubricability. However, a fluoride compound having a lipophilic
group is hard to mix with a glycol ether solvent having
hydrophilicity.
DETAILED DESCRIPTION OF THE INVENTION
Technical Problem
[0005] The present inventors endeavored to develop a functional
fluid composition, and as a result, the present inventors
experimentally confirmed that a functional fluid composition
containing a monoamine-based noise reducer represented by chemical
formula 1 below has an excellent metal corrosion inhibiting effect
as well as an excellent noise reducing effect, and thus the present
inventors completed the present invention.
[0006] Therefore, an aspect of the present invention is to provide
a functional fluid composition comprising a glycol as a base
material, the composition comprising a monoamine-based noise
reducer represented by chemical formula 1 below:
##STR00001##
wherein in chemical formula 1, X and Y are an integer of 1 or
greater; and R is H or CH.sub.3, the weight average molecular
weight of the compound represented by chemical formula 1 being 600
or more.
Technical Solution
[0007] In accordance with an aspect of the present invention, there
is provided a functional fluid composition comprising a glycol as a
base material, the composition comprising a monoamine-based noise
reducer represented by chemical formula 1 below:
##STR00002##
wherein in chemical formula 1, X and Y are an integer of 1 or
greater; and R is H or CH.sub.3, the weight average molecular
weight of the compound represented by chemical formula 1 being 600
or more.
[0008] In the composition of the present invention, the glycol base
material comprises a glycol compound and a boric acid ester
compound.
[0009] The glycol compound may be any one known in the art, but
preferably, the glycol compound is selected from the group
consisting of ethylene glycol, diethylene glycol, triethylene
glycol, propylene glycol, dipropylene glycol, butylene glycol,
polyalkylene glycol, glycol ether, and mixtures thereof. More
preferably, the glycol compound suitable for the composition of the
present invention is ethylene glycol, diethylene glycol, propylene
glycol, dipropylene glycol, polyalkylene glycol, or glycol
ether.
[0010] The glycol ether may be any one known in the art, and
preferably, the glycol ether is selected from the group consisting
of ethylene glycol ethyl ether, diethylene glycol ethyl ether,
triethylene glycol ethyl ether, ethylene glycol methyl ether,
diethylene glycol methyl ether, triethylene glycol methyl ether,
polyethylene glycol methyl ether, ethylene glycol butyl ether,
diethylene glycol butyl ether, triethylene glycol butyl ether,
polyethylene glycol butyl ether, dipropylene glycol methyl ether,
polypropylene glycol methyl ether, and mixtures thereof. More
preferably, the glycol ether suitable for the composition of the
present invention is ethylene glycol methyl ether, diethylene
glycol methyl ether, triethylene glycol methyl ether, polyethylene
glycol methyl ether, ethylene glycol butyl ether, diethylene glycol
butyl ether, triethylene glycol butyl ether, or polyethylene glycol
butyl ether, and most preferably, triethylene glycol monomethyl
ether, polyethylene glycol monomethyl ether, or polyethylene glycol
monobutyl ether.
[0011] The boric acid ester compound is used to prevent the drop of
a boiling point due to moisture absorption, and the boric acid
ester compound is comprised in a content range of 30-60 wt %
relative to 100% of the total weight of the functional fluid
composition. Here, if the amount of the boric acid ester compound
used is less than the above range, a desired effect cannot be
achieved. If the amount thereof exceeds the range, the production
cost may be increased and boric acid may be precipitated.
[0012] According to a most preferable embodiment of the present
invention, the glycol base material used in the present invention
is a mixture of a polyalkylene glycol, polyethylene glycol
monomethyl ether, polyethylene glycol monobutyl ether, triethylene
glycol monomethyl ether and a boric acid ester compound
[0013] In the composition of the present invention, the content of
the glycol base material containing a glycol compound and a boric
acid ester compound is preferably 20-99 wt %, more preferably 40-99
wt %, still more preferably 60-99 wt %, still more preferably 70-99
wt %, and most preferably 85-99 wt %, based on the total weight of
the functional fluid composition.
[0014] In the composition of the present invention, the
monoamine-based noise reducer may be represented by chemical
formula 1 below:
##STR00003##
wherein in chemical formula 1, X and Y are an integer of 1 or
greater; and R is H or CH.sub.3.
[0015] Here, the weight average molecular weight of the compound
represented by chemical formula 1 being 600 or more.
[0016] The weight average molecular weight of the compound
represented by chemical formula 1 is preferably equal to or more
than 600 and equal to or less than 2000, and more preferably equal
to or more than 1000 and equal to or less than 2000.
[0017] Among different molecular weights (M) that may be included
in the compound represented by chemical formula 1 herein, a
molecular weight (M.sub.i) of the compound that is optionally
selected therefrom may be calculated by equation 1 below when R is
H, and may be calculated by equation 2 when R is CH.sub.3:
M.sub.i=[31+{44.times.(X+Y)}] [Equation 1]
M.sub.i=[31+{(44.times.X)+(53.times.Y)] [Equation 2]
wherein in equations 1 and 2, X and Y are an integer of 1 or
greater.
[0018] Meanwhile, the weight average molecular weight (Mw) of the
compound represented by chemical formula 1 may be calculated by
equation 3 below:
n i M i 2 n i M i [ Equation 3 ] ##EQU00001##
wherein in equation 3, n.sub.i means the total number of compounds
having an optional molecular weight M.sub.i.
[0019] In the composition of the present invention, the
monoamine-based compound represented by chemical formula 1 as a
noise reducer may be contained in a content of preferably 0.05-5.0
wt %, more preferably 0.1-5.0 wt %, and most preferably 0.2-5.0 wt
% based on the total weight of the functional fluid
composition.
[0020] According to an embodiment of the present invention, the
composition of the present invention may comprise at least one
additive of a metal corrosion inhibitor and an antioxidant.
[0021] The metal corrosion inhibitor may be any one known in the
art, but the corrosion inhibitor used in the present invention is a
triazole-based compound, an amine-based compound, or a mixture
thereof.
[0022] The triazole-based compound includes various triazoles known
in the art, and may be selected from the group consisting of a
triazole derivative, a benzotriazole derivative, and a tolutriazole
derivative. Specific examples of the benzotriazole derivative
include
N,N-bis(2-ethylhexyl)-4-methyl-1H-benzotriazole-1-methylamine,
N,N-bis(2-ethylhexyl)-5-methyl-1H-benzotriazole-1-methylamine,
octyl-1H-benzotriazole, di-tertiary butylated 1H-benzotriazole,
1H-1,2,3-triazole, 2H-1,2,3-triazole, 1H-1,2,4-triazole,
4H-1,2,4-triazole, 1-(1',2'-di-carboxyethyl)benzotriazole,
2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 1H-1,2,3-triazole,
2H-1,2,3-triazole, 1H-1,2,4-triazole, 4H-1,2,4-triazole,
benzotriazole, tolyltriazole, carboxybenzotriazole,
3-amino-1,2,4-triazole, chlorobenzotriazole, nitrobenzotriazole,
aminobenzotriazole, cyclohexano [1,2-d] triazole,
4,5,6,7-tetrahydroxy-tolyltriazole, 1-hydroxybenzotriazole,
ethylbenzotriazole, naphthotriazole,
1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole,
1-[N,N-bis(2-ethylhexyl)aminomethyl]tolyltriazole,
1-[N,N-bis(2-ethylhexyl)aminomethyl]carboxy benzotriazole,
1-[N,N-bis(di-(ethanol)-aminomethyl]benzotriazole,
1-[N,N-bis(di-(ethanol)-aminomethyl]tolyltriazole,
1-[N,N-bis(di-(ethanol)-aminomethyl]carboxybenzotriazole,
1-[N,N-bis(2-hydroxypropyl)aminomethyl]carboxybenzotriazole,
1-[N,N-bis(1-butyl)aminomethyl]carboxybenzotriazole,
1-[N,N-bis(1-octyl)aminomethyl]carboxybenzotriazole,
1-(2',3'-di-hydroxypropyl)benzotriazole,
1-(2',3'-di-carboxyethyl)benzotriazole,
2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole,
2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole,
2-(2'-hydroxy-4'-octoxyphenyl)benzotriazole,
2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole,
1-hydroxybenzotriazole-6-carboxylic acid, 1-oleoylbenzotriazole,
1,2,4-triazole-3-ol, 3-amino-5-phenyl-1,2,4-triazole,
3-amino-5-heptyl-1,2,4-triazole,
3-amino-5-(4-isopropyl-phenyl)-1,2,4-triazole,
5-amino-3-mercapto-1,2,4-triazole,
3-amino-5-(p.tert-butylphenyl)-1,2,4-triazole,
5-amino-1,2,4-triazole-3-carboxylic acid,
1,2,4-triazole-3-carboxyamide, 4-aminourazole,
1,2,4-triazole-5-one, and the like.
[0023] Preferably, the triazole-based compound includes at least
one selected from benzotriazole, mercaptobenzotriazole,
tolyltriazole, octyltriazole, decyltriazole, dodecyltriazole, and
the like. More preferably, the triazole-based compound is a mixture
of benzotriazole and mercaptobenzotriazole.
[0024] In the composition of the present invention, the content of
the triazole compound as a metal corrosion inhibitor is 0.1-10 wt
%, more preferably 0.5-5.0 wt %, and most preferably 0.5-3.0 wt %,
based on the total weight of the functional fluid composition.
[0025] The amine-based compound may be selected from the group
consisting of an alkanol amine, an alkyl amine and a cyclic amine.
Specific examples of the alkanol amine compound include
monomethanolamine, dimethanolamine, trimethanolamine,
monoethanolamine, diethanolamine, triethanolamine,
monopropanolamine, dipropanolamine, tripropanolamine,
monoisopropanolamine, diisopropanolamine, and triisopropanolamine;
specific examples of the alkylamine compound include dibutyl amine,
tributyl amine, dicyclohexyl amine, cyclohexyl amine and a salt
thereof, piperazine, n-propylamine, isopropylamine, n-butylamine,
isobutylamine, sec-butylamine, tert-butylamine, n-pentylamine,
n-hexylamine, n-heptylamine, n-octylamine, 2-ethylhexylamine,
n-nonylamine, n-decylamine, 2-propylheptyl amine, n-undecylamine,
n-dodecylamine, n-tridecylamine, isotridecylamine,
n-tetradecylamine, n-pentadecylamine, n-hexadecylamine,
n-heptadecylamine, n-octadecylamine, n-nonadecylamine,
n-eicosyl-amine, di-(n-hexyl)amine, di-(n-heptyl)amine,
di-(n-octyl)amine, di-(2-ethylhexyl)amine, di-(n-nonyl)amine,
di-(n-decyl)amine, di-(2-propylheptyl)amine, di-(n-undecyl)amine,
di-(n-dodecyl)amine, di-(n-tridecyl)amine, di-(isotridecyl)amine,
di-(n-tetradecyl)amine, di-(n-pentadecyl)amine,
di-(n-hexadecyl)amine, di-(n-heptadecyl)amine,
di-(n-octadecyl)-amine, di-(n-nonadecyl)amine, di-(n-eicosyl)amine,
n-hexylmethylamine, n-heptyl-methylamine, n-octylmethylamine,
(2-ethylhexyl)methylamine, n-nonylmethylamine, n-decylmethylamine,
(2-propylheptyl)methylamine, n-undecylmethylamine,
n-dodecyl-methylamine, n-tridecylmethylamine,
isotridecylmethylamine, n-tetradecylmethylamine,
n-pentadecylmethylamine, n-hexadecylmethylamine,
n-heptadecylmethylamine, n-octa-decylmethylamine,
n-nonadecylmethylamine, n-eicosylmethylamine, and the like; and
examples of the cyclic amine compound include morpholine and the
like.
[0026] The amine-based compound may include, preferably at least
one selected from methyl amine, dibutyl amine, triethyl amine,
triethanol amine, cyclohexyl amine, and the like, and may be more
preferably a mixture of cyclohexyl amine and dibutyl amine.
[0027] In the composition of the present invention, the content of
the amine-based compound as a metal corrosion inhibitor is 0.1-10
wt %, more preferably 0.5-5.0 wt %, and most preferably 0.5-3.0 wt
%, based on the total weight of the functional fluid
composition.
[0028] Meanwhile, if the content of the metal corrosion inhibitor
is less, a corrosion inhibiting effect can be obtained, and if the
content thereof is more, a great noise may be generated when a
master cylinder is operated in the brake system. As the metal
corrosion inhibitor, 0.1-1.5 wt % of a triazole-based compound and
0.5-2.5 wt % of an amine-based compound based on the total weight
of the functional fluid composition may be used in a mixture.
[0029] In addition, the monoamine-based noise reducer represented
by chemical formula 1 described above exhibits an excellent metal
corrosion inhibiting effect as well as an excellent noise reducing
effect, and thus the metal corrosion inhibitor contained in the
functional fluid composition of the present invention may be
composed of only a triazole-based compound without including an
amine-based compound. In cases where the metal corrosion inhibitor
is composed of only a triazole-based compound, the content of the
triazole compound as a metal corrosion inhibitor is 0.1-10 wt %,
more preferably 0.5-5.0 wt %, and most preferably 0.5-3.0 wt %
based on the total weight of the functional fluid composition.
[0030] According to one embodiment of the present invention, in the
functional fluid composition, the metal corrosion inhibitor is a
triazole-based metal corrosion inhibitor and does not comprise an
amine-based metal corrosion inhibitor.
[0031] In the composition of the present invention, the antioxidant
is used for the purpose of preventing oxidation, and may be any one
known in the art, such as phenol-, amine-, sulfur-, and
phosphorous-based antioxidants. Specific examples of the
phenol-based antioxidant include 2,6-di-tert-butyl-4-methylphenol,
2,6-di-tert-butyl-p-cresol, 2,6-di-tertiary-butyl-4-sect-butyl
phenol, bisphenol A, di-butylhydroxyanisole,
4,4'-butylidenebis-(6-t-butyl-3-methylphenol),
dibutylhydroxytoluene, and the like, and trimethyl dihydroquinoline
or the like may be used as a quinoline antioxidant.
[0032] Preferably, 3,5-di(tert-butyl)-4-hydroxytoluene (BHT) or the
like may be used. The antioxidant may be contained in a content of
0.1-2.0 wt % relative to the total weight of the functional fluid
composition. If the content of the antioxidant is less, an
antioxidative effect cannot be obtained, and if the content thereof
is more, a great noise may be generated when a master cylinder is
operated in the brake system.
Advantageous Effects
[0033] Features and advantages of the present invention are
summarized as follows.
[0034] (a) The present invention provides a functional fluid
composition comprising a glycol as a base material, the composition
comprising a monoamine-based noise reducer represented by chemical
formula 1 below:
##STR00004##
wherein in chemical formula 1, X and Y are an integer of 1 or
greater; and R is H or CH.sub.3, the weight average molecular
weight of the compound represented by chemical formula 1 being 600
or more.
[0035] (b) The functional fluid composition of the present
invention can have an excellent noise reducing effect by using a
monoamine-based compound as a noise reducer. In addition, the
functional fluid composition of the present invention can exhibit
an excellent metal corrosion inhibiting effect even when a metal
corrosion inhibitor composed of a triazole-based compound without
including an amine-based compound is used.
BRIEF DESCRIPTION OF THE DRAWINGS
[0036] FIG. 1 shows images illustrating a structure of a noise test
device.
[0037] FIG. 2 shows the analysis of a sound waveform and a sound
pressure level (dB) of the noise in examples and test example
1.
[0038] FIG. 3 shows the analysis of a sound waveform and a sound
pressure level (dB) of a noise in examples and test example 2.
[0039] FIG. 4 shows the analysis of a sound waveform and a sound
pressure level (dB) of a noise in examples and test example 3.
MODE FOR CARRYING OUT THE INVENTION
[0040] Hereinafter, the present invention will be described in
detail with reference to examples. These examples are only for
illustrating the present invention more specifically, and it will
be apparent to those skilled in the art that the scope of the
present invention is not limited by these examples.
Examples and Test Example 1
[0041] (1) Preparation of Functional Fluid Composition
[0042] Functional fluid compositions of examples 1-1 to 1-5 and
comparative examples 1-1 to 1-4 were prepared by using ingredients
and compositional ratios thereof shown in table 1-1.
TABLE-US-00001 TABLE 1-1 Exam- Exam- Exam- Exam- Exam- Composition
ple 1-1 ple 1-2 ple 1-3 ple 1-4 ple 1-5 Polyalkylene glycol 5 5 5 5
5 Polyethylene glycol 14 14 14 14 14 monomethylether Polyethylene
glycol 13 13 13 13 13 monobutylether Triethylene glycol 11.05 11
9.1 6.1 4.1 monomethylether Boric acid ester 53.4 53.4 53.4 53.4
53.4 compound Benzotriazole 0.5 0.5 0.5 0.5 0.5 Mercapto
benzotriazole 0.4 0.4 0.4 0.4 0.4 BHT 0.5 0.5 0.5 0.5 0.5
Cyclohexylamine 0.6 0.6 0.6 0.6 0.6 Dibutylamine 1.5 1.5 1.5 1.5
1.5 Monoamine-based noise 0.05 0.1 0.2 2 5 reducer Compar- Compar-
Compar- Compar- ative ative ative ative exam- exam- exam- exam-
Composition ple 1-1 ple 1-2 ple 1-3 ple 1-4 Polyalkylene glycol 5 5
5 5 Polyethylene glycol 14 14 14 14 monomethylether Polyethylene
glycol 13 13 13 13 monobutylether Triethylene glycol 11.1 8.2 13.2
14.6 monomethylether Boric acid ester 53.4 53.4 53.4 53.4 compound
Benzotriazole 0.5 0.5 0.5 Mercapto benzotriazole 0.4 0.4 0.4 BHT
0.5 0.5 0.5 Cyclohexylamine 0.6 Dibutylamine 1.5 Monoamine-based
noise 2 reducer
[0043] Meanwhile, the monoamine-based noise reducer employed a
monoamine-based compound represented by chemical formula 1 below
and having a molecular weight of 600 Mw.
##STR00005##
[0044] Here, the molar ratio of the compound wherein R is H and the
compound wherein R is CH.sub.3 is 9:1.
[0045] (2) Noise Test and Metal Corrosion Test
[0046] For a noise test, a noise test device shown in FIG. 1 was
manufactured, and the noise level was evaluated while a brake pedal
was repeatedly operated/returned.
[0047] The noise test device shown in the images of FIG. 1 is
composed of: a booster unit which generates braking force by an
operation of a brake pedal provided at one side of a vehicle driver
seat; a master cylinder which receives the amplified force from the
booster unit to generate a brake hydraulic pressure; wheel
cylinders that are respectively installed on front and rear wheels
to brake a car by the brake hydraulic pressure generated in the
master cylinder; and an oil storage tank which supplies a brake
fluid to the master cylinder and stores a brake fluid returned from
the wheel cylinders. Meanwhile, the brake fluid means a functional
fluid composition.
[0048] The noise test device was used to measure the level of
noise, and the level of noise was scored according to the
evaluation criteria in Table 1-2 below. The results are shown in
Table 1-3. In addition, the sound waveform and sound pressure level
(dB) of a noise were analyzed (sound analysis program, WaveLab),
and the results are shown in FIG. 2.
[0049] Meanwhile, the metal corrosion was evaluated according to
the test method of paragraph 5.5 of KS M 2141 and the results are
shown in Table 1-3.
TABLE-US-00002 TABLE 1-2 Evaluation score Noise intensity
.circleincircle. No noise .largecircle. Fine recognition .DELTA.
Recognizable X Unsatisfactory
TABLE-US-00003 TABLE 1-3 Exam- Exam- Exam- Exam- Exam- ple 1-1 ple
1-2 ple 1-3 ple 1-4 ple 1-5 Noise X X .DELTA. .DELTA. .largecircle.
Metal Good Good Good Good Good corrosion Comparative Comparative
Comparative Comparative example 1-1 example 1-2 example 1-3 example
1-4 Noise X .DELTA. X .circleincircle. Metal Good Good Cast iron
Steel, corrosion corrosion cast iron corrosion
Examples and Test Example 2
[0050] (1) Preparation of Functional Fluid Composition
[0051] Functional fluid compositions of examples 2-1 to 2-5 and
comparative examples 2-1 to 2-4 were prepared by using ingredients
and compositional ratios thereof shown in table 2-1.
TABLE-US-00004 TABLE 2-1 Exam- Exam- Exam- Exam- Exam- Composition
ple 2-1 ple 2-2 ple 2-3 ple 2-4 ple 2-5 Polyalkylene glycol 5 5 5 5
5 Polyethylene glycol 14 14 14 14 14 monomethylether Polyethylene
glycol 13 13 13 13 13 monobutylether Triethylene glycol 11.05 11
9.1 6.1 4.1 monomethylether Boric acid ester 53.4 53.4 53.4 53.4
53.4 compound Benzotriazole 0.5 0.5 0.5 0.5 0.5 Mercapto
benzotriazole 0.4 0.4 0.4 0.4 0.4 BHT 0.5 0.5 0.5 0.5 0.5
Cyclohexylamine 0.6 0.6 0.6 0.6 0.6 Dibutylamine 1.5 1.5 1.5 1.5
1.5 Monoamine-based noise 0.05 0.1 0.2 2 5 reducer Compar- Compar-
Compar- Compar- ative ative ative ative exam- exam- exam- exam-
Composition ple 2-1 ple 2-2 ple 2-3 ple 2-4 Polyalkylene glycol 5 5
5 5 Polyethylene glycol 14 14 14 14 monomethylether Polyethylene
glycol 13 13 13 13 monobutylether Triethylene glycol 11.1 8.2 13.2
14.6 monomethylether Boric acid ester 53.4 53.4 53.4 53.4 compound
Benzotriazole 0.5 0.5 0.5 Mercapto benzotriazole 0.4 0.4 0.4 BHT
0.5 0.5 0.5 Cyclohexylamine 0.6 Dibutylamine 1.5 Monoamine-based
noise 2 reducer
[0052] Meanwhile, the monoamine-based noise reducer employed a
monoamine-based compound represented by chemical formula 1 below
and having a molecular weight of 1000 Mw.
##STR00006##
[0053] Here, the molar ratio of the compound wherein R is H and the
compound wherein R is CH.sub.3 is 3:19.
[0054] (2) Noise Test and Metal Corrosion Test
[0055] The noise test and the metal corrosion test were carried out
by the same method and criteria as in examples and test example 1.
The results are shown in Table 2-2. Meanwhile, the sound waveform
and sound pressure level (dB) of a noise were analyzed (sound
analysis program, WaveLab), and the results are shown in FIG.
3.
TABLE-US-00005 TABLE 2-2 Exam- Exam- Exam- Exam- Exam- ple 2-1 ple
2-2 ple 2-3 ple 2-4 ple 2-5 Noise .DELTA. .largecircle.
.circleincircle. .circleincircle. .circleincircle. Metal Good Good
Good Good Good corrosion Comparative Comparative Comparative
Comparative example 2-1 example 2-2 example 2-3 example 2-4 Noise X
.circleincircle. X .circleincircle. Metal Good Good Cast iron
Steel, corrosion corrosion cast iron corrosion
Examples and Test Example 3
[0056] (1) Preparation of Functional Fluid Composition
[0057] Functional fluid compositions of examples 3-1 to 3-5 and
comparative examples 3-1 to 3-4 were prepared by using ingredients
and compositional ratios thereof shown in table 3-1.
TABLE-US-00006 TABLE 3-1 Exam- Exam- Exam- Exam- Exam- Composition
ple 3-1 ple 3-2 ple 3-3 ple 3-4 ple 3-5 Polyalkylene glycol 5 5 5 5
5 Polyethylene glycol 14 14 14 14 14 monomethylether Polyethylene
glycol 13 13 13 13 13 monobutylether Triethylene glycol 11.05 11
9.1 6.1 4.1 monomethylether Boric acid ester 53.4 53.4 53.4 53.4
53.4 compound Benzotriazole 0.5 0.5 0.5 0.5 0.5 Mercapto
benzotriazole 0.4 0.4 0.4 0.4 0.4 BHT 0.5 0.5 0.5 0.5 0.5
Cyclohexylamine 0.6 0.6 0.6 0.6 0.6 Dibutylamine 1.5 1.5 1.5 1.5
1.5 Monoamine-based noise 0.05 0.1 0.2 2 5 reducer Compar- Compar-
Compar- Compar- ative ative ative ative exam- exam- exam- exam-
Composition ple 3-1 ple 3-2 ple 3-3 ple 3-4 Polyalkylene glycol 5 5
5 5 Polyethylene glycol 14 14 14 14 monomethylether Polyethylene
glycol 13 13 13 13 monobutylether Triethylene glycol 11.1 8.2 13.2
14.6 monomethylether Boric acid ester 53.4 53.4 53.4 53.4 compound
Benzotriazole 0.5 0.5 0.5 Mercapto benzotriazole 0.4 0.4 0.4 BHT
0.5 0.5 0.5 Cyclohexylamine 0.6 Dibutylamine 1.5 Monoamine-based
noise 2 reducer
[0058] Meanwhile, the monoamine-based noise reducer employed a
monoamine-based compound represented by chemical formula 1 below
and having a molecular weight of 2000 Mw.
##STR00007##
[0059] Here, the molar ratio of the compound wherein R is H and the
compound wherein R is CH.sub.3 is 10:31
[0060] (2) Noise Test and Metal Corrosion Test
[0061] The noise test and the metal corrosion test were carried out
by the same method and criteria as in examples and test example 1.
The results are shown in Table 3-2. Meanwhile, the sound waveform
and sound pressure level (decibel, dB) of a noise were analyzed
(sound analysis program, WaveLab), and the results are shown in
FIG. 4.
TABLE-US-00007 TABLE 3-2 Exam- Exam- Exam- Exam- Exam- ple 3-1 ple
3-2 ple 3-3 ple 3-4 ple 3-5 Noise X .largecircle. .circleincircle.
.circleincircle. .circleincircle. Metal Good Good Good Good Good
corrosion Comparative Comparative Comparative Comparative example
3-1 example 3-2 example 3-3 example 3-4 Noise X .circleincircle. X
.circleincircle. Metal Good Good Cast iron Steel, corrosion
corrosion cast iron corrosion
[0062] For reference, the method for evaluating metal corrosion
according to the test method of paragraph 5.5 of KS M 2141 is as
follows.
[0063] (1) Corrosion Test Method
[0064] Metal test pieces (tinned iron, steel, aluminum, cast iron,
brass, copper) polished with 320A silicon carbide to avoid surface
impressions were prepared with a surface area of 25.5 cm.sup.2. The
respective metal pieces were weighed to 0.1 mg, and then were
brought into electric contact with each other through bolt
assembling.
[0065] The assembled metal pieces and a standard SBR cup were
placed in a 475 ml-volume glass bottle, and a brake fluid mixed
with 5 vol % of distilled water was allowed to fill 400 ml. The
glass bottle was tightly closed with a tin-plated iron lid having a
ventilation hole (0.8.+-.0.1) mm in diameter, and then placed in an
oven at 100.+-.2.degree. C. for 120.+-.2 hours.
[0066] The bottle was cooled at room temperature for 60-90 minutes,
and then the metal pieces were immediately taken out, washed water,
and then wiped with a cloth wetted with 95% ethanol one by one. The
metal pieces were inspected for corrosion or impression marks.
[0067] Meanwhile, the metal test pieces and the brake fluid test
cup used in the corrosion test are shown in tables 4 and 5
below.
TABLE-US-00008 TABLE 4 Metal test pieces listed in Annex B of KS M
2141 Copper plate Material Surface corrosion standard General
material data Dimension Thickness requirements Tinned ASTM A-624
Tinplate, Electrolytic As As sheared. iron Fed. Spec. bright sr
type Mr. T-3 purchased Clean and uniform QQ-T-425A No. 2885 IB
tinning Steel SAE 1018 Low carbon sheet, .apprxeq.0.2 cm Edge
machined to Cold rolled remove shearing Hardness 40HB- marks, clean
72HB uniform surfaces Aluminum SAE AA 2024 Wrought aluminum
.apprxeq.0.2 cm Edge machined to alloy, temper T-3, remove shearing
hardness: 75B marks, clean typical uniform surfaces Cast iron SAE G
3000 automotive cast Length .apprxeq. 8 cm .apprxeq.0.4 cm Surface
grind iron. Shall be free Width .apprxeq. 1.3 cm sides to from
shrinkage Surface area .apprxeq. (25 .+-. dimension using cavities,
porosity or 2) cm.sup.2 well-dressed No. any other defects 80
alundum detrimental to wheel, clean specification use of uniform
surfaces the material. Hardness: 86HB- 98HB Brass SAE CA 260
wrought alloy- .apprxeq.0.2 cm Edge machined to yellow brass rolled
remove shearing sheet or piece, marks, clean Hardness: 54HB-
uniform surfaces 74HB Copper SAE CA 114 Cold-rolled copper
.apprxeq.0.2 cm Edge machined to sheet or piece, remove shearing
Hardness: 35HB- marks, clean 56HB uniform surfaces Note: Drill hole
with 4 mm-5 mm in diameter and aapprox. 6 mm from one end of each
piece. Holes shall be clean and free from burrs. Hardness range are
commercial for the designated metals. Hardness is not specified for
the tinned iron because it is not considered a practical
rerquirement. Test pieces (strips) can be obtained from Society of
Automotive Engineers Inc., 400 Commonwalth Drive, Warrendale, Pa.
15096, USA or Laboratoire de Recherches et de controle du
caoutchouc, 12 rue Crves, 9212D montrouge, France.
TABLE-US-00009 TABLE 5 Brake fluid test cup defined in annex A of
KS M 2141 Ingredient Weight ratio SBR 1503.sup.a form 100 Oil
furnace black (NBS 378) 40 Zinc oxide (NBS 370) 5 Sulfur (NBS 371)
0.25 Stearic acid (NBS 372) 1 N-tertiary-butyl-2-benzothiazole
sulphenamide (NBS 384) 1
Symmetrical-dibetanaphthyl-p-phenylenediamine 1.5 Dicumyl peroxide
(40% on precipitated CaCO.sub.3).sup.b 4.5 Total 153.25 Note: The
ingredient list (NBS . . .) should have the same technical
characteristics as ones provided by the National Bureau of
Standards (U.S.A.). .sup.aPhilprene 1503 is suitable. .sup.bused
within 90 days after preparation and stored at a temperature of
27.degree. C. or less.
[0068] (2) Corrosion Evaluation Method
[0069] When the brake fluid was tested according to the corrosion
test method, the weights of the test pieces were measured by the
unit of 0.1 mg, and the variation (mg/cm.sup.2) was calculated
according to the equation 4.
[0070] The weight change should not exhibit the corrosion exceeding
the reference values shown in Table 6 below. The outer contact
surface of the metal piece should not be impressed or roughened
enough to be visible to the naked eye. However, the metal piece was
allowed to be stained or decolorized.
[0071] The brake fluid/water mixture should not be hardened at
(23.+-.5.degree.) C. at the end of the test, and the formed
crystalline precipitates should not stick to the wall of the glass
bottle or the surface of the metal piece. The mixture should not
contain 0.1 vol % or more of precipitate, and the pH of the mixture
should be equal to or higher than 7.0 and equal to or lower than
11.5.
Variation = weight before test - weight after test surface area [
Equation 4 ] ##EQU00002##
TABLE-US-00010 TABLE 6 Maximum allowable weight change Test piece
(mg/cm.sup.2, surface area) Tinned iron 0.20 Steel 0.20 Aluminum
0.10 Cast iron 0.20 Brass 0.40 copper 0.40
* * * * *