U.S. patent application number 15/964188 was filed with the patent office on 2018-11-29 for press-fit lubricant composition.
This patent application is currently assigned to KYODO YUSHI CO., LTD.. The applicant listed for this patent is DENSO CORPORATION, KYODO YUSHI CO., LTD.. Invention is credited to Yusuke ASADA, Shozo IKEJIMA, Kyoji INUKAI, Hiroyuki ISHIKAWA, Masanori KOMABA, Takahiro NIHIRA, Takahiro NOZU, Takumi SHIOMI.
Application Number | 20180340128 15/964188 |
Document ID | / |
Family ID | 64400863 |
Filed Date | 2018-11-29 |
United States Patent
Application |
20180340128 |
Kind Code |
A1 |
NIHIRA; Takahiro ; et
al. |
November 29, 2018 |
PRESS-FIT LUBRICANT COMPOSITION
Abstract
There is provided a press-fit lubricant composition comprising
an unsaturated compound with an iodine value of 100 or more.
Inventors: |
NIHIRA; Takahiro; (Tokyo,
JP) ; ISHIKAWA; Hiroyuki; (Odawara-shi, JP) ;
KOMABA; Masanori; (Chigasaki-shi, JP) ; IKEJIMA;
Shozo; (Okazaki-shi, JP) ; ASADA; Yusuke;
(Kariya-shi, JP) ; NOZU; Takahiro; (Kariya-shi,
JP) ; SHIOMI; Takumi; (Kariya-shi, JP) ;
INUKAI; Kyoji; (Kariya-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KYODO YUSHI CO., LTD.
DENSO CORPORATION |
Fujisawa-shi
Kariya-shi |
|
JP
JP |
|
|
Assignee: |
KYODO YUSHI CO., LTD.
Fujisawa-shi
JP
DENSO CORPORATION
Kariya-shi
JP
|
Family ID: |
64400863 |
Appl. No.: |
15/964188 |
Filed: |
April 27, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C10M 2205/028 20130101;
C10M 2207/06 20130101; C10M 2219/02 20130101; C10M 2203/024
20130101; C10M 2209/084 20130101; C10M 2207/125 20130101; C10M
2207/12 20130101; C10M 2219/08 20130101; C10M 2215/18 20130101;
C10M 2201/081 20130101; C10N 2020/067 20200501; C10M 2219/00
20130101; C10M 2205/02 20130101; C10M 2215/16 20130101; C10M
2201/1056 20130101; C10M 2207/044 20130101; C10M 2215/10 20130101;
C10M 2215/182 20130101; C10M 2229/02 20130101; C10M 2215/02
20130101; C10N 2030/02 20130101; C10N 2040/17 20200501; C10N
2030/26 20200501; C10M 2215/08 20130101; C10M 2207/08 20130101;
C10M 2215/14 20130101; C10M 171/00 20130101; C10M 2203/1006
20130101; C10M 2201/043 20130101; C10M 2215/224 20130101; C10M
101/04 20130101; C10M 2201/04 20130101; C10M 2207/023 20130101;
C10M 2211/00 20130101; C10M 2223/06 20130101; C10M 2217/045
20130101; C10M 2227/08 20130101; C10M 2201/08 20130101; C10M
2219/04 20130101; C10M 2227/081 20130101; C10M 2215/04 20130101;
C10M 2207/126 20130101; C10M 2227/081 20130101; C10N 2010/08
20130101; C10M 2207/126 20130101; C10N 2010/14 20130101; C10M
2207/126 20130101; C10N 2010/14 20130101; C10M 2227/081 20130101;
C10N 2010/08 20130101 |
International
Class: |
C10M 101/04 20060101
C10M101/04 |
Foreign Application Data
Date |
Code |
Application Number |
May 26, 2017 |
JP |
2017-104377 |
Claims
1. A press-fit lubricant composition comprising an unsaturated
compound with an iodine value of 100 or more.
2. The lubricant composition according to claim 1, wherein the
unsaturated compound is a drying oil or a semi-drying oil.
3. The lubricant composition according to claim 1, wherein the
unsaturated compound is selected from the group consisting of
squalene, docosahexaenoic acid (DHA), tung oil, linseed oil,
perilla oil, castor oil, safflower oil, sunflower oil, benne oil,
rapeseed salad oil, soybean oil, cottonseed oil, rice bran oil, and
a mixture thereof.
4. The press-fit lubricant composition according to claim 1,
further comprising a compound selected from the group consisting of
peroxides, azides, metallic soaps, inorganic acids, Lewis acids,
organometallic compounds, sulfur, sulfur compounds, amines, thiol
compounds, organophosphorus compounds, imidazole compounds, olefin,
cyclic ethers, methacrylic acid compounds, acrylic acid compounds,
isocyanate compounds, silicone compounds, phenol compounds,
urethane compounds, azonitriles, azoesters, azoamides, azoamidines,
azoimidazoliums, benzoin derivatives, benzyl ketals,
.alpha.-hydroxyacetophenones, .alpha.-aminoacetophenones,
acylphosphone oxides, titanocenes, iodonium salts, sulfonium salts,
and mixtures thereof.
5. The press-fit lubricant composition according to claim 1,
further comprising a thickener.
6. An electrical contact point wherein the lubricant composition
according to claim 1 is applied to any one or both of a press-fit
terminal and a through hole of a printed circuit board.
7. A press-fit connection method comprising applying the lubricant
composition according to claim 1 to any one or both of a press-fit
terminal and a through hole of a printed circuit board.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to a press-fit lubricant
composition used for a type of connection called press-fit
connection.
Brief Description of the Related Art
[0002] Use of press-fit connection has been spreading in recent
years as a technique for connection between an electronic board and
a terminal.
[0003] The press-fit connection is a method of establishing
electrical contact between a conductive through hole provided in a
printed circuit board and a press-fit terminal having a bulged
portion wider than the diameter of the through hole by mechanically
fixing the press-fit terminal to the through hole by press-fitting
without soldering.
[0004] Since the press-fit connection does not require soldering
when connecting the printed circuit board and the press-fit
terminal, it is possible to expect advantages of e.g. providing a
lead free printed circuit board, conserving energy by omitting a
heat source necessary for soldering, and shortening the
process.
[0005] On the other hand, since the press-fit connection is a type
of connection by press-fitting the press-fit terminal to the
through hole, there is a case where the plating on the surface of
the press-fit terminal may scrape off and generate plating scraps
due to the frictional force between the surface of the through hole
and the surface of the press-fit terminal. If the produced plating
scraps scatter due to cooling air or vibration, the plating scraps
may cause a problem of short circuiting when the plating scraps
adhere to a wiring pattern and leads disposed in the vicinity.
[0006] A measure taken against the above problem is to capture
plating scraps produced at insertion, thus preventing the
scattering of the plating scraps. Methods reported so far include,
for example, a method of trapping the produced plating scraps
inside the through hole by plastic films laminated on both surfaces
of a printed circuit board (Japanese Patent Application Publication
No. Hei 6-13735), and a method of allowing an adhesive agent or a
resin coating applied onto the surface of a press-fit terminal to
hold the plating scraps (Japanese Patent No. 3969369, Japanese
Patent No. 5337520). A method is also reported of allowing a pasty
curing resin to hold the plating scraps and to prevent detachment
and slight movement of the press-fit terminal after being cured
(Japanese Patent Application Publication No. 2009-16064).
SUMMARY OF INVENTION
[0007] The present invention aims to provide a lubricant
composition which makes it possible both to reduce friction at
insertion of a press-fit terminal and to maintain connection of the
inserted press-fit terminal to a printed circuit board, i.e., a
holding force after insertion. Prior art has focused mainly on
capturing metal scraps produced. Meanwhile, for the press-fit
terminal, the reduction of friction at insertion and the
maintaining of the holding performance after insertion are also
considered important issues from the respective viewpoints of
preventing the production of abrasion powder and preventing
detachment of the press-fit terminal. For example, Japanese Patent
No. 3969369 also points out the reduction of friction at insertion,
but does not seem to pay attention to the maintaining of the
holding performance after insertion. Japanese Patent Application
Publication No. 2009-16064 refers to prevention of detachment of
the inserted press-fit terminal by use of a pasty curing resin.
However, in the case of using a pasty resin which has a large
surface tension and low flowability, the resin may not always flow
sufficiently into a through hole. As a result, there will be a case
where it is impossible to achieve sufficient lubricity at insertion
or a case where it is impossible to obtain a sufficient contact
area between the press-fit terminal and the through hole.
[0008] The inventors have found a solution to the problems
described above by using a drying oil as a base oil of the
lubricant composition. As a result of further studies, the
inventors have findings that the above-described problem can be
solved by using an unsaturated compound with a specific iodine
value. To be more specific, the present invention provides the
following lubricant composition.
[0009] 1. A press-fit lubricant composition comprising an
unsaturated compound with an iodine value of 100 or more.
[0010] 2. The lubricant composition according to item 1, wherein
the unsaturated compound is one of a drying oil and a semi-drying
oil.
[0011] 3. The lubricant composition according to item 1, wherein
the unsaturated compound is selected from the group consisting of
squalene, docosahexaenoic acid (DHA), tung oil, linseed oil,
perilla oil, castor oil, safflower oil, sunflower oil, benne oil,
rapeseed salad oil, soybean oil, cottonseed oil, rice bran oil, and
a mixture thereof.
[0012] 4. The press-fit lubricant composition according to any one
of items 1 to 3, further containing a compound selected from the
group consisting of peroxides, azides, metallic soaps, inorganic
acids, Lewis acids, organometallic compounds, sulfur, sulfur
compounds, amines, thiol compounds, organophosphorus compounds,
imidazole compounds, olefin, cyclic ethers, methacrylic acid
compounds, acrylic acid compounds, isocyanate compounds, silicone
compounds, phenol compounds, urethane compounds, azonitriles,
azoesters, azoamides, azoamidines, azoimidazoliums, benzoin
derivatives, benzyl ketals, .alpha.-hydroxyacetophenones,
.alpha.-aminoacetophenones, acylphosphine oxides, titanocenes,
iodonium salts, sulfonium salts, and mixtures thereof.
[0013] 5. The press-fit lubricant composition according to any one
of items 1 to 4, further containing a thickener.
[0014] 6. An electrical contact point wherein the lubricant
composition according to any one of items 1 to 5 is applied to any
one or both of a press-fit terminal and a through hole of a printed
circuit board.
[0015] 7. A press-fit connection method comprising applying the
lubricant composition according to any one of items 1 to 5 to any
one or both of a press-fit terminal and a through hole of a printed
circuit board.
[0016] The present invention makes it possible both to reduce
friction at insertion of the press-fit terminal and to connect the
press-fit terminal to the printed circuit board after the
insertion. According to the composition of the present invention,
it is possible to insert the press-fit terminal to the printed
circuit board without using a mechanical force of e.g. a hydraulic
cylinder or a crank mechanism, or even in the case of using a
mechanical force, with a low load of about 65% or less of that
without lubricant.
DETAILED DESCRIPTION OF INVENTION
[0017] A base oil constituting a lubricant composition of the
present invention contains an unsaturated compound with an iodine
value (I.sub.2g/100 g) of 100 or more, and preferably 130 or more.
The iodine value is preferably 1000 or less, more preferably 500 or
less, and still more preferably 380 or less. Note that the iodine
value is a value measured in accordance with JIS K0070.6. Moreover,
in the present specification, a "liquid component" means a
component which is derived from an additive and is in the liquid
state at normal temperature (25.degree. C.), in addition to the
unsaturated compound.
[0018] The unsaturated compound includes a drying oil and a
semi-drying oil. The drying oil refers to a fatty oil which, if
left in air, reacts with oxygen to solidify and dry. The
semi-drying oil is an oil intermediate between the drying oil and
the non-drying oil, and its iodine value is typically 100 to 130.
Specific examples of the drying oil and the semi-drying oil include
squalene, docosahexaenoic acid (DHA), tung oil, linseed oil,
perilla oil, castor oil, safflower oil, sunflower oil, benne oil,
rapeseed salad oil, soybean oil, cottonseed oil, and rice bran
oil.
[0019] The viscosity at 25.degree. C. of the base oil of the
present invention is 2 mPas or more, preferably 5 mPas or more, and
more preferably 10 mPas or more, and 100,000 mPas or less,
preferably 10,000 mPas or less, and more preferably 250 mPas or
less. The lubricant composition of the present invention containing
such a base oil is preferable because it is easily introduced
between a press-fit terminal and a through hole formed in a printed
circuit board and can be expected to contribute to good
connectivity thanks to a large connectable area. In particular, the
viscosity at 25.degree. C. of the base oil is 2 mPas or more,
preferably 5 mPas or more, and more preferably 10 mPas, and the
apparent variation of viscosity at 25.degree. C. is preferably 5%
or less within the shear rate range of 10 to 1000 s.sup.-1. In this
case, the viscosity at 25.degree. C. of the base oil is preferably
100,000 mPas or less, more preferably 10,000 mPas or less, and
still more preferably 250 mPas or less. Such a base oil is
preferable because the lubricant composition pushed out to the edge
of the through hole at insertion of the press-fit terminal flows as
a Newtonian fluid and is easily introduced into the through hole
with passage of time, and thus the base oil can be expected to
contribute to good connectivity thanks to a large connectable
area.
[0020] The content of the unsaturated compound in the lubricant
composition of the present invention is preferably 7% by mass or
more, more preferably 10% by mass or more, and still more
preferably 15% by mass or more with respect to the total mass of
the lubricant composition. The content of the unsaturated compound
within such a range is preferable because it is possible to prevent
the press-fit terminal from being pulled off thanks to the curing
of the lubricant composition.
[0021] The lubricant composition of the present invention can
consist only of the base oil, but can contain various additives as
necessary which can usually be used for the lubricant composition.
Such additives include a rust inhibitor, an oxidation inhibitor, an
oiliness agent, a metal deactivator, an anti-wear agent, an extreme
pressure agent, and a solid lubricant. The content of these
additives in the lubricant composition is typically 0.1 to 20% by
mass.
[0022] The lubricant composition of the present invention can also
contain various curing accelerators in order to promote curing in
the atmosphere at room temperature.
[0023] The curing accelerator includes at least one of peroxides,
azides, metallic soaps, inorganic acids, Lewis acids,
organometallic compounds, sulfur, sulfur compounds, amines, thiol
compounds, organophosphorus compounds, imidazole compounds, olefin,
cyclic ethers, methacrylic acid compounds, acrylic acid compounds,
isocyanate compounds, silicone compounds, phenol compounds, and
urethane compounds.
[0024] The peroxide is preferably any of hydroperoxide, ketone
peroxide, peroxyester, dialkyl peroxide, and peroxydicarbonate. The
metallic soap is preferably a metallic soap formed by coordinating
a saturated or unsaturated fatty acid or a naphthenic acid to one
metal of cobalt, manganese, lead, zinc, nickel, barium, calcium,
aluminum, potassium, copper, iron, lithium, and zirconium, more
preferably a metallic soap formed by coordinating an unsaturated
fatty acid to one of those metals, and particularly preferably
cobalt octoate. The inorganic acid is preferably diluted sulfuric
acid or diluted hydrochloric acid. The Lewis acid is preferably
hydrogen iodide, iodine, zinc triiodide, or boron trichloride. The
organometallic compound is preferably a cyclopentadienyl complex.
The sulfur compound is preferably one of thiourea based, thiazole
based, sulfenamide based, thiuram based, dithiocarbamate salt
based, and xanthate based sulfur compounds. The amine is preferably
a diamine and particularly preferably
trimethylhexamethylenediamine. The thiol compound is preferably a
thiol compound having 2 to 4 thiol groups, 12 to 22 carbon atoms at
a portion connected to the thiol groups, 4 to 10 oxygen atoms, and
0 to 3 nitrogen atoms. The cyclic ether is preferably a cyclic
ether having 2 to 4 glycidyl groups at the end of the molecule, 4
to 20 carbon atoms at a portion connected to the glycidyl groups, 2
to 6 oxygen atoms, and 0 to 4 nitrogen atoms, or a polymer thereof.
The isocyanate compound is preferably an isocyanate or a polymer
thereof having two or more isocyanate groups and 6 to 14 carbon
atoms at a portion connected to the isocyanate groups. Among the
above, the metallic soap, the amine, and the cyclic ether are
preferable.
[0025] The content of such curing accelerating compounds can be
0.01 to 50% by mass, preferably 0.01 to 40% by mass, more
preferably 0.01 to 30% by mass with respect to the total mass of
the lubricant composition of the present invention.
[0026] The lubricant composition of the present invention may also
be a grease obtained by adding a thickener thereto. Such a
thickener includes a soap thickener such as a lithium soap or a
lithium complex soap, a urea based thickener such as diurea, an
inorganic thickener such as organoclay or silica, and an organic
thickener such as PTFE, but is preferably the inorganic thickener
or the organic thickener. The inorganic thickener is more
preferable and silica is most preferable.
[0027] If the lubricant composition of the present invention
contains a thickener, the ratio of the thickener is preferably 0.5
to 85% by mass, more preferably 0.5 to 70% by mass, still more
preferably 0.5 to 60% by mass, yet further preferably 1 to 65% by
mass, and particularly preferably 5 to 55% by mass with respect to
the total mass of the lubricant composition. In the case of 0.5% by
mass or more, the thickening effect is exhibited. In the case of
65% by mass or less, a sufficient lubricating effect can easily be
obtained because the lubricant composition becomes a grease with
appropriate hardness and the lubricant spreads throughout the
lubrication portion.
[0028] If the lubricant composition of the present invention
contains a thickener, the penetration of the lubricant composition
is preferably 300 to 475, more preferably 310 to 475, and still
more preferably 400 to 430. Note that the penetration is a value
which is defined by JIS K2220 and is measured immediately after 60
strokes are performed in a sample by a specified mixer. If the
lubricant composition of the present invention is a grease
containing a curing accelerator, the curing accelerator may be
added at the same time in the preparation of the grease using a
base oil, a thickener, and an additive added as necessary, or may
be added after the preparation of the grease. Noted that the
penetration of a grease refers to a value measured within 30
minutes after the addition of the curing accelerator.
[0029] If the lubricant composition of the present invention is
used when fastening a first component and a second component
together, it is possible to reduce the friction between the first
component and the second component because the lubricant
composition exists in the liquid state at the fastening, and to
connect the first component and the second component together after
the fastening.
[0030] The connection can be achieved when the lubricant
composition of the present invention is cured or thickened by
polymerization or crosslinking.
[0031] It is possible to cure or thicken the lubricant composition
of the present invention by allowing it to stand in the atmosphere
at room temperature.
[0032] The curing or thickening can proceed by any of radical
polymerization, cationic polymerization, coordination
polymerization, and vulcanization. A compound which allows the
curing or thickening to proceed by radical polymerization is at
least one of peroxides, azides, and metallic soaps. A compound
which allows the curing or thickening to proceed by cationic
polymerization is at least one of an inorganic acid and a Lewis
acid. A compound which allows the curing or thickening to proceed
by coordination polymerization include an organometallic compound.
A compound which allows the curing or thickening to proceed by
vulcanization is at least one of sulfur and a sulfur compound.
[0033] It is possible to cure or thicken the lubricant composition
of the present invention by heating. Compounds for which allow the
curing or thickening to proceed by heating include azonitriles,
azoesters, azoamides, azoamidines, azoimidazoliums, and so on. Such
a curing accelerating compound can be contained at 0.01 to 25% by
mass, preferably 0.01 to 10% by mass with respect to the total mass
of the lubricant composition of the present invention.
[0034] It is also possible to cure or thicken the lubricant
composition of the present invention by ultraviolet irradiation.
Compounds which allow the curing or thickening to proceed by
ultraviolet irradiation include benzoin derivatives, benzyl ketals,
.alpha.-hydroxyacetophenones, .alpha.-aminoacetophenones,
acylphosphine oxides, titanocenes, iodonium salts, sulfonium salts,
and so on. Such curing accelerating compounds can be contained at
0.01 to 25% by mass, preferably 0.01 to 10% by mass with respect to
the total mass of the lubricant composition of the present
invention.
[0035] Note that the concentration of additive described in the
present specification is the concentration of active ingredient. To
be more specific, if the additive is a diluted additive, the
concentration means the concentration of active ingredient in the
diluted additive. Moreover, if the lubricant composition of the
present invention is a grease, the concentration of additive is
measured with respect to the total mass of the grease lubricant
composition.
[0036] The lubricant composition of the present invention is
applicable to a bulged portion of a press-fit terminal and/or to a
through hole. It is possible to apply the lubricant composition of
the present invention by immersing the press-fit terminal in the
lubricant composition, injecting the lubricant composition with
e.g. a spray gun, or using e.g. a brush.
[0037] The printed circuit board and the press-fit terminal can be
connected together by applying the composition of the present
invention thereto, followed by standing in the atmosphere at room
temperature (25.degree. C.) or by heating. Those skilled in the art
can appropriately select the stand time and the heating time. For
example, it is possible to connect the printed circuit board and
the press-fit terminal in the atmosphere at room temperature
(25.degree. C.) for 1000 hours or more. In the case of connecting
this composition by heating, it is preferable to heat the
composition at 80 to 150.degree. C. for 24 hours or more. For
example, in the case of connecting the composition by ultraviolet
irradiation which is formed by adding a curing accelerator to tung
oil, it is preferable to perform ultraviolet irradiation for 60
minutes or more.
[0038] It is possible to obtain an electronic device using the
lubricant composition of the present invention.
[0039] It is possible to form an electrical contact point using the
lubricant composition of the present invention.
[0040] It is possible to carry out a method of establishing
electrical connection using the lubricant composition of the
present invention.
[0041] It is possible to form a contact point for establishing
electrical connection by press-fit connection using the lubricant
composition of the present invention.
[0042] It is possible to carry out a method of establishing
electrical connection by press-fit connection using the lubricant
composition of the present invention.
Examples
[0043] Lubricant compositions of Examples and Comparative Examples
were prepared.
[0044] In Examples 1 to 5 and Comparative Examples 1 and 2, the
lubricant composition was the base oil itself.
[0045] In Example 6, the lubricant composition was a mixture of 3
parts by mass of diluted solvent of cobalt octoate (commercially
available, diluted mineral spirits, containing 12% by mass of
cobalt octoate in cobalt atomic ratio concentration) as a curing
accelerator, 13 parts by mass of trimethylhexamethylenediamine, and
53 parts by mass of a polymer of
2,2-bis(4-glycidyloxyphenyl)propane with respect to 100 parts by
mass of tung oil as the base oil.
[0046] In Example 7, the lubricant composition was a grease mixture
of 335 parts by mass of silica particles as a thickener, 35 parts
by mass of trimethylhexamethylenediamine as a curing accelerator,
and 140 parts by mass of a polymer of
2,2-bis(4-glycidyloxyphenyl)propane with respect to 100 parts by
mass of tung oil as the base oil. Note that the worked penetration
of the grease fabricated in Example 7 was 430 and the worked
penetration was measured within 30 minutes after the addition of
the curing accelerator.
[0047] Each of Comparative Examples 3 and 4 was a commercial
one-component epoxy adhesive.
[0048] The lubricant composition prepared above was used in the
following tests. Tables 1 shows test conditions for the insertion
test and the pull test. Tables 2 and 3 show the test results.
<Test>
1-1. Iodine Value
[0049] The iodine value of the base oil was measured in accordance
with JIS K0070.6. To be more specific, the iodine value was
calculated using the following equation after dissolving the base
oil into cyclohexane, adding a solution of iodine monochloride,
allowing it to stand in a dark place, adding potassium iodide and
water, performing titration using a solution of sodium thiosulfate,
adding a starch solution when the solution turns thin yellow, and
continuing titration until blue vanishes.
A=(B-C).times.f.times.1.269/S
[0050] A: iodine value
[0051] B: amount of 0.1 mol/l sodium thiosulfate solution (ml) used
for blank test
[0052] C: amount of 0.1 mol/l sodium thiosulfate solution (ml) used
for titration
[0053] f: factor of sodium thiosulfate solution
[0054] S: mass of base oil (g)
[0055] 1.269: atomic weight of iodine 126.9.times.1/100
2-1. Viscosity
[0056] The viscosity of base oil was measured in accordance with
JIS Z8803:2011. To be more specific, the viscosity within the shear
rate rage of 10 to 1000 s.sup.-1 was measured using a cone-plate
rotational viscometer with the sample provided between the cone and
the plate. For Examples 1 to 7 and Comparative Examples 1 to 2, the
tables show viscosities at 25.degree. C. and 100 s.sup.-1 as
representative values. Note that for Examples 1 to 7 and
Comparative Examples 1 to 2, the variation of viscosity within the
shear rate range of 10 to 1000 s.sup.-1 was within 1%. In addition,
for the samples of Comparative Examples 3 and 4 which were
semi-solid and exhibited high viscosity at normal temperature, the
tables show viscosities measured in accordance with a method and
conditions different from the above. To be more specific, for
Comparative Example 3, the tables show the viscosity at 23.degree.
C. and at 20 rpm using a single cylinder rotational viscometer. For
Comparative Example 4, the tables show the viscosity at 25.degree.
C. and at 10 rpm using a cone-plate rotational viscometer.
3-1. Insertion Test
[0057] The friction reduction effect (lubricity) of the lubricant
composition was evaluated by measuring the "insertion load" at the
insertion of the press-fit terminal.
3-2. Test Procedures
[0058] (1) A printed circuit board was fixed to a jig attached to
the base of an Autograph.
[0059] (2) A distal end of the press-fit terminal was immersed in
the lubricant composition and the lubricant composition adhered to
the press-fit terminal.
[0060] (3) The press-fit terminal was fixed to a jig attached to
the drive unit of the Autograph.
[0061] (4) The position of the press-fit terminal was adjusted so
that the distal end of the press-fit terminal was immediately above
a through hole of the printed circuit board.
[0062] (5) The press-fit terminal was driven at a constant
speed.
[0063] (6) An axial force (insertion load) at the insertion of the
press-fit terminal into the through hole was measured at 25.degree.
C.
3-3. Evaluation Criteria
[0064] Evaluation was carried out based on the relative value,
which is 100% without lubricant.
[0065] 65% or less of the insertion load without lubricant:
.largecircle. (acceptable)
[0066] over 65% of the insertion load without lubricant: x
(unacceptable)
4-1. Pull Test
[0067] The "pull load" at the pulling of the press-fit terminal was
measured to evaluate to what extent the holding performance of the
press-fit terminal was suppressed.
4-2. Test Procedures
[0068] (1) In Examples 1 to 5 and Comparative Examples 1 to 4, the
printed circuit board after the insertion of the press-fit terminal
was allowed to stand for 72 hours in a thermostatic chamber heated
to 100.degree. C. at a normal pressure. In Example 6, the printed
circuit board after the insertion of the press-fit terminal was
allowed to stand for 72 hours in a room at normal temperature
(25.degree. C.) and at normal pressure. In Example 7, the printed
circuit board after the insertion of the press-fit terminal was
allowed to stand for 24 hours in a room at normal temperature
(25.degree. C.) and at normal pressure.
[0069] (2) The heated printed circuit board of Examples 1 to 5 and
Comparative Examples 1 to 4 was cooled under room temperature
(25.degree. C.). Note that the procedures (1) and (2) described
above were omitted in the case of measuring the pull load
immediately after the insertion of the press-fit terminal.
[0070] (3) A printed circuit board was fixed to a jig attached to
the base of an Autograph.
[0071] (4) A jig attached to the drive unit of the Autograph was
driven at a constant speed to pull out the press-fit terminal.
[0072] (5) An axial force (pull load) at the pulling of the
press-fit terminal from a through hole of the printed circuit board
was measured at 25.degree. C.
4-3. Evaluation Criteria
[0073] Evaluation was carried out based on the difference between
the value immediately after the insertion of and the value after
curing of each lubricant composition, where the pull load
immediately after insertion without lubricant is 100%.
[0074] The difference between the pull loads before and after
curing is +15% or more: .largecircle. (acceptable)
[0075] The difference between the pull loads before and after
curing is below +15%: x (unacceptable)
TABLE-US-00001 TABLE 1 Test Conditions Speed Insertion test: 2 mm/s
Pull Test: 0.2 mm/s Press-fit Terminal Material: Phosphor Bronze
Plate: Sn Outer Diameter: 1.2 mm Printed Circuit Board Material:
Glass Epoxy Resin Through Hole Plate: Cu Dimension: .phi.1.0 mm
Insertion And Pull Test Temperature 25.degree. C.
TABLE-US-00002 TABLE 2 Reference Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex.
6 Ex. 7 Sample Without Squalene Tung Rapeseed Linseed DHA Tung Oil
Tung Oil Lubricant Oil salad oil Oil -- -- -- -- -- Curing Curing
Accelerator Accelerator -- -- -- -- -- -- silica Iodine Value --
363 165 101 185 355 165 165 Viscosity (25.degree. C.) [mPa s] -- 13
222 65 47 27 222 222 Relative Value of Insertion Load [%] Reference
.largecircle. .largecircle. .largecircle. .largecircle.
.largecircle. .largecircle. .largecircle. 100% 64% 58% 59% 61% 63%
64% 62% Relative Value of Pull Load [%] Reference 44% 26% 32% 31%
35% 26% 34% (Immediately After Insertion) 100% Relative Value of
Pull Load [%] (After 91% 108% 79% 49% 48% 50% 60% 126% Being
Allowed To Stand) Difference Between pull Loads Before --
.largecircle. .largecircle. .largecircle. .largecircle.
.largecircle. .largecircle. .largecircle. And After Curing
Acceleration [%] -9% +64% +53% +17% +17% +15% +34% +92%
TABLE-US-00003 TABLE 3 Comp. Comp. Comp. Comp. Reference Ex. 1 Ex.
2 Ex. 3 Ex. 4 Sample Without PAO Silicone One-Component
One-Component Lubricant Oil Epoxy Epoxy Adhesive 1 Adhesive 2
Iodine Value -- 0 0 0 14 Viscosity (25.degree. C.) [mPa s]
(23.degree. C. -- 27 98 180 .times. 10.sup.3 31 .times. 10.sup.3
only in Comparative Example 3) Relative Value of Insertion Load [%]
Reference X X X X 100% 68% 75% 86% 69% Relative Value of Pull Load
[%] Reference 54% 38% 45% 36% (Immediately After Insertion) 100%
Relative Value of Pull Load [%] 91% 65% 49% 410% 421% (After Being
Allowed To Stand) Difference Between pull Loads Before -- X X
.largecircle. .largecircle. And After Curing Acceleration [%] -9%
+11% +11% 365% 385%
* * * * *