U.S. patent application number 14/769174 was filed with the patent office on 2015-12-31 for water-based metal working oil agent.
This patent application is currently assigned to IDEMITSU KOSAN CO., LTD.. The applicant listed for this patent is IDEMITSU KOSAN CO., LTD.. Invention is credited to Yosuke JIBIKI, Hiroshi KAWASAKI, Fumiaki TAKAGI.
Application Number | 20150376536 14/769174 |
Document ID | / |
Family ID | 51391285 |
Filed Date | 2015-12-31 |
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United States Patent
Application |
20150376536 |
Kind Code |
A1 |
KAWASAKI; Hiroshi ; et
al. |
December 31, 2015 |
WATER-BASED METAL WORKING OIL AGENT
Abstract
A water-based metalworking fluid contains a component (A) of
alkanolamine represented by a formula (1) below as an amine
component and a component (B) of alkanolamine represented by a
formula (2) below as an amine component, a molar ratio of an amine
component having a molecular weight of 90 or less to a total of the
amine components (the amine component having a molecular weight of
90 or less/the total of the amine components) is 0.67 or less.
##STR00001## In the formula, R.sup.1 represents hydrogen or an
alkyl group having 1 to 3 carbon atoms; n is 1 to 3; and R.sup.1
may be mutually the same or different. ##STR00002## In the formula:
R.sup.2 represents an alkyl group having 1 to 10 carbon atoms; and
Z.sup.1 and Z.sup.2 each independently represent an alkylene group
having 2 to 8 carbon atoms.
Inventors: |
KAWASAKI; Hiroshi;
(Ichihara-shi, JP) ; TAKAGI; Fumiaki;
(Ichihara-shi, JP) ; JIBIKI; Yosuke;
(Ichihara-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
IDEMITSU KOSAN CO., LTD. |
Chiyoda-ku |
|
JP |
|
|
Assignee: |
IDEMITSU KOSAN CO., LTD.
Chiyoda-ku
JP
|
Family ID: |
51391285 |
Appl. No.: |
14/769174 |
Filed: |
February 19, 2014 |
PCT Filed: |
February 19, 2014 |
PCT NO: |
PCT/JP2014/053917 |
371 Date: |
August 20, 2015 |
Current U.S.
Class: |
508/511 ;
508/562 |
Current CPC
Class: |
C10M 173/02 20130101;
C10M 2229/02 20130101; C10N 2040/22 20130101; C10M 2219/09
20130101; C10M 2219/104 20130101; C10N 2030/64 20200501; C10N
2030/12 20130101; C10M 2217/041 20130101; C10N 2040/24 20130101;
C10M 133/08 20130101; C10M 2215/042 20130101; C10M 2215/042
20130101; C10M 2215/042 20130101 |
International
Class: |
C10M 133/08 20060101
C10M133/08 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 20, 2013 |
JP |
2013-031026 |
Claims
1. A water-based metalworking fluid comprising: a component (A) of
alkanolamine represented by formula (1) below as a first amine
component; and a component (B) of alkanolamine represented by
formula (2) below as a second amine component, wherein the
water-based metalworking fluid has a molar ratio of an amine
component having a molecular weight of 90 or less to a total of
amine components of 0.67 or less. ##STR00006## where each R.sup.1
represents hydrogen or an alkyl group having 1 to 3 carbon atoms; n
is 1, 2 or 3; and the R.sup.1's are mutually the same or different,
##STR00007## where R.sup.2 represents an alkyl group having 1 to 10
carbon atoms; and Z.sup.1 and Z.sup.2 each independently represent
an alkylene group having 2 to 8 carbon atoms.
2. The water-based metalworking fluid according to claim 1, wherein
n is 2 or 3.
3. The water-based metalworking fluid according to claim 1, wherein
the component (A) comprises 1-amino-2-propanol.
4. The water-based metalworking fluid according to claim 1, wherein
one or both of Z.sup.1 and Z.sup.2 are each an alkylene group
having 2 carbon atoms.
5. The water-based metalworking fluid according to claim 1, wherein
the component (B) comprises N-methyldiethanolamine and
cyclohexyldiethanolamine.
6. The water-based metalworking fluid according to claim 1, further
comprising an aliphatic carboxylic acid.
7. The water-based metalworking fluid according to claim 1, being
diluted with water, wherein the water has an amount that is 200 or
less times of the amount of the water-based metalworking fluid by
mass.
Description
TECHNICAL FIELD
[0001] The present invention relates to a water-based metalworking
fluid used in metalworking such as cutting or grinding.
BACKGROUND ART
[0002] A metalworking fluid used in metalworking is categorized
into an oil-type (oil-based) fluid and a water-type (water-based)
fluid, the latter of which is more frequently used because such a
water-based fluid is excellent in cooling capabilities and
infiltration capabilities and free from a risk of causing a fire.
Such a water-based metalworking fluid, which is to be diluted with
water in use, is required to have rust resistance. As such a rust
resistant component, it is generally known to use alkanolamine such
as monoethanolamine, diethanolamine and triethanolamine (see Patent
Literature 1).
CITATION LIST
Patent Literature(s)
[0003] Patent Literature 1: JP-A-11-209774
SUMMARY OF THE INVENTION
Problem(s) to be Solved by the Invention
[0004] The water-based metalworking fluid generally exhibits more
favorable rust resistance at a larger content of a rust resistant
component. However, when an amine-based rust resistant component
(e.g., alkanolamine) is contained, odor is derived from amines to
occasionally have an adverse influence on human bodies and working
environments. Accordingly, a type and a content of the rust
resistant component still need to be studied.
[0005] An object of the present invention is to provide a
water-based metalworking fluid that exhibits an excellent rust
resistance and causes less odor to be more environmentally friendly
and less harmful to human bodies.
Means for Solving the Problem(s)
[0006] In order to solve the above problems, the invention provides
a water-based metalworking fluid as follows.
(1) According to an aspect of the invention, a water-based
metalworking fluid contains a component (A) of alkanolamine
represented by a formula (1) below as an amine component and a
component (B) of alkanolamine represented by a formula (2) below as
an amine component, a molar ratio of an amine component having a
molecular weight of 90 or less to a total of the amine components
(the amine component having a molecular weight of 90 or less/the
total of the amine components) is 0.67 or less.
##STR00003##
[0007] In the formula, R' represents hydrogen or an alkyl group
having 1 to 3 carbon atoms; n is 1 to 3; and R' may be mutually the
same or different.
##STR00004##
[0008] In the formula: R.sup.2 represents an alkyl group having 1
to 10 carbon atoms; and Z.sup.1 and Z.sup.2 each independently
represent an alkylene group having 2 to 8 carbon atoms.
(2) In the water-based metalworking fluid in the above aspect of
the invention, n in the formula (1) representing the component (A)
of alkanolamine is 2 or 3. (3) In the water-based metalworking
fluid in the above aspect of the invention, the component (A) of
alkanolamine comprises 1-amino-2-propanol. (4) In the water-based
metalworking fluid in the above aspect of the invention, one or
both of Z.sup.1 and Z.sup.2 in the formula (2) representing the
component (B) of alkanolamine are an alkylene group(s) having 2
carbon atoms. (5) In the water-based metalworking fluid in the
above aspect of the invention, the component (B) of alkanolamine
comprises N-methyldiethanolamine and cyclohexyldiethanolamine. (6)
The water-based metalworking fluid in the above aspect of the
invention further contains an aliphatic carboxylic acid. (7) A
water-based metalworking fluid according to another aspect of the
invention is prepared by diluting the water-based metalworking
fluid according to the above aspect of the invention with water, an
amount of the water being 200 or less times as much as an amount of
the water-based metalworking fluid according to the above aspect of
the invention by a mass ratio.
[0009] According to the above aspect of the invention, since
alkanolamine having a specific structure is contained as the amine
component and the molar ratio of the amine component having a
molecular weight of 90 or less is defined as being equal to or less
than a specific ratio, the water-based metalworking fluid that
exhibits an excellent rust resistance and causes less odor to be
more environmentally friendly and less harmful to human bodies can
be provided.
DESCRIPTION OF EMBODIMENT(S)
[0010] Exemplary embodiment(s) of the invention will be described
below.
[0011] In an exemplary embodiment, a water-based metalworking fluid
contains a component (A) of alkanolamine represented by a formula
(1) below and a component (B) of alkanolamine represented by a
formula (2) as amine components, a molar ratio of an amine
component having a molecular weight of 90 or less to a total of
amine components (i.e., an amine component having a molecular
weight of 90 or less/a total of amine components) is 0.67 or
less.
##STR00005##
[0012] First of all, the component (A) will be described. The
component (A) is used for particularly providing rust resistance to
the water-based metalworking fluid. In the above formula (1),
R.sup.1 represents hydrogen or an alkyl group having 1 to 3 carbon
atoms. n is 1 to 3. R.sup.1 may be mutually the same or different.
When n is 4 or more, solubility of the component (A) is unfavorably
reduced. n is more preferably 2 or 3, most preferably 2. In
addition, when any one of R' has 4 or more carbon atoms, the
solubility of the component (A) and rust resistance for iron are
unfavorably deteriorated.
[0013] An amine compound having a molecular weight of 90 or less is
preferably included in the component (A) of alkanolamine in order
to improve rust resistance.
[0014] Examples of the component (A) are 1-amino-2-propanol,
2-amino-2-methyl-1-propanol, 1-amino-2-butanol, 2-amino-1-propanol,
and 3-amino-2-butanol. Among the above, in view of the rust
resistance for iron, 1-amino-2-propanol and
2-amino-2-methyl-1-propanol are preferable.
[0015] In the exemplary embodiment, the component (A) may be
provided by a single one or a plurality of the above
substances.
[0016] Next, alkanolamine as the component (B) will be described.
The component (B) contributes to improving rust resistance and
reducing odor.
[0017] In the formula (2), which represents the component (B),
R.sup.2 represents an alkyl group having 1 to 10 carbon atoms. When
R.sup.2 has a non-cyclic structure, R.sup.2 preferably has 1 to 4
carbon atoms, more preferably 1 carbon atom. When R.sup.2 has 11 or
more carbon atoms, solubility and rust resistance of the component
(B) are unfavorably deteriorated. Z.sup.1 and Z.sup.2 each
independently represent an alkylene group having 2 to 8 carbon
atoms. One or both of Z' and Z.sup.2 are preferably an alkylene
group having 2 carbon atoms. When at least one of Z' and Z.sup.2
has 1 carbon atom, the component (B) is degraded to generate
formaldehyde, which is environmentally unfavorable. When at least
one of Z' and Z.sup.2 has 9 or more carbon atoms, the solubility of
the component (B) is unfavorably deteriorated.
[0018] Examples of the component (B) are N-methyldiethanolamine,
N-ethyldiethanolamine, cyclohexyldiethanolamine,
N-n-propyldiethanolamine, N-i-propyldiethanolamine,
N-n-butyldiethanolamine, N-i-butyldiethanolamine, and
N-t-butyldiethanolamine. Among the above, it is particularly
preferable to use N-methyldiethanolamine and
cyclohexyldiethanolamine in combination.
[0019] In the exemplary embodiment, the component (B) may be
provided by a single one or a plurality of the above
substances.
[0020] When contents of the amine components used as the rust
resistant component in the water-based metalworking fluid are the
same, the amine component having a smaller molecular weight
exhibits more favorable rust resistance. This means that the amine
component having a smaller molecular weight can provide rust
resistance equivalent to those of the amine component having a
larger molecular weight with a content lower than a content of the
amine component having a larger molecular weight. However, the
amine component having a smaller molecular weight, particularly a
molecular weight of 90 or less, is highly volatile, so that the
amine component intensifies odor as the content thereof is
increased in the fluid. Accordingly, it is generally difficult to
achieve both of less odor and rust resistance by only adjusting the
content of the rust resistant component.
[0021] In the water-based metalworking fluid in the exemplary
embodiment, the molar ratio of the amine component having a
molecular weight of 90 or less to the total of the amine components
(i.e., the amine component having a molecular weight of 90 or
less/the total of the amine components) is 0.67 or less, preferably
in a range of 0.6 to 0.4, more preferably in a range of 0.55 to
0.5. When the molar ratio exceeds 0.67, odor of the water-based
metalworking fluid is unfavorably intensified to have an adverse
influence on human bodies and working environments.
[0022] In view of handling ability, the water-based metalworking
fluid in the exemplary embodiment is preferably prepared as a stock
solution having a high concentration, so that a user dilutes the
stock solution as necessary with water to use the diluted stock
solution as metalworking fluid.
[0023] A solvent for the stock solution is the most preferably
water, but may be mineral oil or synthetic oil.
[0024] Such mineral oil or synthetic oil used as the solvent for
preparing the stock solution is not specifically limited but may be
any base oil generally used for the metalworking fluid. Such
mineral oil or synthetic oil preferably has kinematic viscosity at
40 degrees C. in a range of 1 to 50 mm.sup.2/s, more preferably in
a range of 2 to 30 mm.sup.2/s. When the kinematic viscosity of the
base oil is too high, the fluid may adhere to a workpiece, whereby
a large amount of the fluid may be carried together with the
workpiece, which may be economically unfavorable. In contrast, when
the kinematic viscosity of the base oil is too low, mist generation
may unfavorably deteriorate workability. A pour point (i.e., the
index of low-temperature fluidity) of the base oil is not subject
to any limitations, but preferably -10 degrees C. or less.
[0025] As the mineral oil or the synthetic oil, various kinds of
oil are available. The mineral oil or the synthetic oil may be
suitably selected therefrom, depending on the usage.
[0026] Examples of the mineral oil are oil fraction obtained by
atmospherically distilling paraffin-based crude oil,
intermediate-based crude oil or naphthene-based crude oil or by
vacuum-distilling residual oil formed by atmospheric distilling,
and purified oil obtained by refining the oil fraction in
accordance with an ordinary method. Examples of the purified oil
are solvent-refined oil, hydrogenerated refined oil,
dewaxing-processed oil, and white clay-processed oil.
[0027] On the other hand, examples of the synthetic oil are
poly-.alpha.-olefin, .alpha.-olefin copolymer, polybutene,
alkylbenzene, polyolester, diacid ester, polyoxyalkylene glycol,
polyoxyalkylene glycol ester, polyoxyalkylene glycol ether, and
silicone oil. Among the above synthetic oil, poly-.alpha.-olefin
and .alpha.-olefin copolymer are preferable. The base oil may
contain single one or a plurality of the above mineral oil or
synthetic oil, or may contain both the mineral oil and the
synthetic oil.
[0028] The component (A) is preferably contained in the stock
solution at a ratio of 1 to 20 mass % of the total amount of the
stock solution, more preferably 5 to 14 mass %, further preferably
9 to 13 mass %. When the ratio of the component (A) exceeds 20 mass
%, odor is unfavorably intensified.
[0029] The component (B) is preferably contained in the stock
solution at a ratio of 5 to 30 mass % of the total amount of the
stock solution, more preferably 10 to 30 mass %, further preferably
22 to 29 mass %. When the ratio of the component (B) is less than 5
mass %, odor is unfavorably intensified. Even when the ratio of the
component (B) exceeds 30 mass %, rust resistance for iron is not
further enhanced, resulting in high cost, which is economically
unfavorable.
[0030] When the water-based metalworking fluid in the exemplary
embodiment is used, the above-described stock solution is
preferably diluted with water an amount of which is 200 times or
less as much as that of the stock solution by mass ratio. The stock
solution is more preferably diluted to 10 to 100 times, further
preferably 20 to 50 times. When the stock solution is diluted with
water the amount of which exceeds 200 times as much as that of the
stock solution, the prepared fluid unfavorably exhibits
insufficient rust resistance.
[0031] The water-based metalworking fluid may be blended as
necessary with various known additives as long as an object of the
present invention is not hampered. Examples of the additives are a
fungicide, aliphatic carboxylic acid, metal deactivator
(anticorrosion agent), extreme pressure agent, oiliness agent,
surfactant and antifoaming agent.
[0032] The fungicide is exemplified by 2-pyridylthio-1-oxide salt.
Examples of the fungicide are 2-pyridylthio-1-oxide sodium, zinc
bis(2-pyridylthio-1-oxide), and bis(2-sulfidepyridine-1-olato)
copper. Among the above, 2-pyridylthio-1-oxide sodium is
particularly preferable because the substance is effective on
general bacteria and molds in a wide range even when contained
therein with a low concentration. In view of blending effects, the
fungicide is contained in the stock solution with a content of
approximately 0.01 to 5 mass % of the total amount of the final
diluted fluid.
[0033] The aliphatic carboxylic acid is added to the fluid in order
to further enhance cutting capabilities, grinding capabilities and
rust resistance of the fluid. The aliphatic carboxylic acid is
exemplified by carboxylic acid having 6 to 60 carbon atoms and/or
dicarboxylic acid. Specific examples of the aliphatic carboxylic
acid are caproic acid, caprylic acid, nonane acid, lauric acid,
stearic acid, olein acid, ricinolein acid, hydroxyfatty acid (such
as recinoleic acid or 12-hydroxystearic acid), arachidic acid,
behenic acid, melissic acid, isononane acid (3,5,5-trimethylhexane
acid), neo-decane acid, isostearic acid, fatty acid extracted from
fat and oil such as soy oil fatty acid, coconut oil fatty acid or
rape-seed oil fatty acid, acid extracted from petroleum such as
naphthene acid, adipic acid, sebacic acid (decanedioic acid),
dodecanoic diacid, monohydroxy arachidic acid or dihydroxy
arachidic acid, and synthetic fatty acid such as dimer or trimer of
olein acid, recinoleic acid, ricinolein acid, 12-hydroxystearic
acid. In view of antifoaming of the fluid and stability of hard
water, particularly preferable examples of monocarboxylic acid are
caproic acid having 8 to 10 carbon atoms, nonane acid having 8 to
10 carbon atoms, decane acid having 8 to 10 carbon atoms, isononane
acid having 8 to 10 carbon atoms, and neodecane acid having 8 to 10
carbon atoms while examples of particularly preferable dicarboxylic
acid are nonane diacid, undecanoic diacid, sebacic acid
(decanedioic acid), and dodecanoic diacid. In view of blending
effects, the aliphatic carboxylic acid is contained in the stock
solution with a content of approximately 0.1 to 1.5 mass % of the
total amount of the final diluted fluid.
[0034] The aliphatic carboxylic acid reacts with the amine
components to form an aliphatic carboxylic acid amine salt, thereby
enhancing processability or emulsion stability serving as an
emulsifier to further enhance rust resistance.
[0035] A sum of the aliphatic carboxylic acid component and the
amine components preferably accounts for 40 to 60 mass % of the
total amount of the stock solution, more preferably 47 to 55 mass
%, further preferably 50 to 53 mass %.
[0036] Examples of the metal deactivator are benzotriazole,
benzotriazole derivative, imidazoline, pyrimidine derivative,
thiadiazole and thiadiazole. The metal deactivator may be provided
by a single one or a plurality of the above substances. In view of
blending effects, the metal deactivator is contained in the stock
solution with a content of approximately 0.01 to 3 mass % of the
total amount of the final diluted fluid.
[0037] Examples of the extreme pressure agent are a sulfur-based
extreme pressure agent, a phosphorus-based extreme pressure agent,
an extreme pressure agent containing sulfur and metal and an
extreme pressure agent containing phosphorus and metal. The extreme
pressure agent may be provided by a single one or a plurality of
the above substances. The extreme pressure agent may be any extreme
pressure agent, as long as the extreme pressure agent contains
sulfur atoms and/or phosphorus atoms in its molecule and as long as
the extreme pressure agent can provide load bearing effects and
wear resistance. Examples of the extreme pressure agent containing
sulfur in its molecule are sulfurized fat and oil, sulfurized fatty
acid, ester sulfide, olefin sulfide, dihydrocarbyl polysulfide, a
thiadiazole compound, an alkylthiocarbamoyl compound, a triazine
compound, a thioterpene compound, a dialkylthiodipropionate
compound and the like. In view of blending effects, the extreme
pressure agent is contained in the stock solution with a content of
approximately 0.05 to 0.5 mass % of the total amount of the final
diluted fluid.
[0038] Examples of the oiliness agent are a fatty acid compound
such as fatty alcohol, fatty acid or fatty acid metal salt, an
ester compound such as polyol ester, sorbitan ester or glyceride,
an amine compound such as fatty amine and the like. In view of
blending effects, the oiliness agent is contained in the stock
solution with a content of approximately 0.2 to 2 mass % of the
total amount of the final diluted fluid.
[0039] Examples of the antifoaming agent are methyl silicone oil,
fluorosilicone oil, and polyacrylate. In view of blending effects,
the antifoaming agent is contained in the stock solution with a
content of approximately 0.004 to 0.02 mass % of the total amount
of the final diluted fluid.
[0040] The surfactant is not subject to any limitations. A nonionic
surfactant, an anionic surfactant, a cationic surfactant, an
ampholytic surfactant or a mixture thereof is usable as the
surfactant. Preferable examples of the surfactant are a nonionic
surfactant, an anionic surfactant, or a mixture thereof.
[0041] Examples of the nonionic surfactant include a
polyoxyalkylene surfactant such as: polyoxyalkyleneglycol, a
monoether compound thereof or a diether compound thereof; and
glycerin, an adduct of glycerin with alkylene oxide or an ether
compound of glycerin, esters of carboxylic acid and alcohol, and an
adduct of alkylamine with alkylene oxide.
[0042] Examples of the anionic surfactant include a salt of
carboxylic acid (e.g., a saturated or unsaturated fatty acid or
hydroxy fatty acid having 7 to 22 carbon atoms) or sulfonic acid
with amine or metal, an ester of a polycondensation product of a
hydroxy fatty acid (e.g., ricinoleic acid) with fatty acid or a
salt of the ester with amine or metal, phosphoric ester salts such
as sulfates (e.g., dialkyl sodium sulfosuccinate), a polymerized
polymer surfactant provided by partially saponifying olefin (e.g.,
styrene) with a maleic anhydride copolymerized product, and a
naphthalenesulfonate-formalin fused polymer surfactant.
[0043] The water-based metalworking fluid in the exemplary
embodiment, which is diluted as necessary with water so that its
concentration is adjusted suitably for the usage, is preferably
applied in various metalworking fields such as cutting, grinding,
polishing, squeezing, drawing, flatting and the like. Further,
because of an excellent rust resistance for metal products and less
odor, the water-based metalworking fluid in the exemplary
embodiment is less harmful to environments and human bodies.
EXAMPLES
[0044] Next, the invention will be described in more detail with
reference to Examples. However, the invention is not limited at all
by the Examples.
Examples 1 to 4, Comparatives 1 to 3
[0045] A water-based metalworking fluid (stock solution) according
to each of Examples 1 to 4 and Comparatives 1 to 3 was prepared by
blending components shown in Table 1. After the prepared stock
solution was diluted with water to a certain concentration,
Examples 1 to 4 and Comparatives 1 to 3 each were evaluated in
terms of the following characteristics. Evaluation results are
shown in Table 1.
(1) Rust Resistance (in Accordance with DIN51360-02-A)
[0046] Test for rust resistance was conducted at room temperature
for two hours on diluted solutions prepared by diluting the stock
solution with tap water to the concentration of 1.0 mass %, 1.1
mass %, 1.2 mass %, 1.3 mass %, 1.4 mass %, 1.5 mass % and 2.0 mass
% respectively. The minimum concentration at which a rust value had
become 0 was set as limit concentration (mass %) in terms of rust
resistance.
(2) Odor
[0047] An aqueous solution was prepared by diluting the stock
solution with an ion-exchange water so that the concentration of
the stock solution was 10.0 mass %. 100 mL of the aqueous solution
was hermetically sealed in a 300 mL conical flask and heated at 100
degrees C. for three minutes. The heated aqueous solution was
measured in terms of odor intensity using an odor sensor (e-nose
mobile manufactured by Karumoa Inc.) A value indicates an odor
index (relative value) representing an odor intensity. The larger
value indicates the intenser odor.
TABLE-US-00001 TABLE 1 Compar- Compar- Comparative Example 1
Example 2 Example 3 Example 4 ative 1 ative 2 3 Blending
Decanedioic acid 2.9 2.9 2.9 2.9 -- 2.9 2.9 Composition
Dodecanedioic acid 2.2 2.2 2.2 2.2 12.3 2.2 2.2 (mass %)
Neodecanoic acid 9.9 9.9 9.9 9.9 -- 9.9 9.9 3,5,5-trimethyl
hexanoic acid -- -- -- -- 1.0 -- -- N-methyldiethanolamine
(Component B) 16.8 22.1 13.3 9.8 -- -- -- 1-amino-2-propanol
(Component A) 12.2 9.2 14.3 16.3 24.6 22.0 24.5
cyclohexyldiethanolamine (Component B) 6.2 6.2 6.2 6.2 10.0 6.2 0.0
1,2,3-benzotriazole 0.5 0.5 0.5 0.5 1.0 0.5 0.5 Other
components.sup.1) 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Water 48.4 46.1 49.8
51.3 50.2 55.4 59.1 Total 100.0 100.0 100.0 100.0 100.0 100.0 100.0
Amine component having a molecular weight of 0.50 0.37 0.58 0.67
0.86 0.90 1.00 90 or less/Total amine components (mol/mol) Total of
Component A (mass %) 12.2 9.2 14.3 16.3 24.6 22.0 24.5 Total of
Component B (mass %) 23.0 28.3 19.5 16.0 10.0 6.2 0.0 Acid
component + Amine component 50.7 52.9 49.2 47.8 48.9 43.7 39.9
Evaluation Limit concentration of rust resistance (mass %) 1.1 1.1
1.1 1.1 1.1 1.2 1.3 Item Odor (Intensity) 3365 3225 3805 3924 4310
4417 4781
[0048] As is obvious from Table 1, the water-based metalworking
fluid in each of Examples 1 to 4 exhibits an excellent rust
resistance and causes less odor. In contrast, since the water-based
metalworking fluid in each of Comparatives 1 to 3 does not contain
the essential components required in the invention, the odor
intensity is high although the rust resistance is excellent.
INDUSTRIAL APPLICABILITY
[0049] A water-based metalworking fluid of the invention is usable
in a metalworking field such as cutting or grinding.
* * * * *