Note: Descriptions are shown in the official language in which they were submitted.
BACKGRO~ND OF T~E INVENTION
This invention relates to metalworking lubricants and to a
process employing such lubricants and is especially concerned with lubricants
which provide the dual function of corrosion protection as well as good drawing
characteristics.
The desirability of providing corrosion and rust protection
and drawability is well recognized in the metalworking art. However, the
ability to satisfy both functions in one composition has not been easily
attained since they represent somewhat contradictory or opposing technologies.
Problems with regard to stability, compatability and relative effectiveness
for the combined functions have made it difficult to attain suitable lubricant
compositions.
SUMMARY OF T~IE INVENTION
It has now been found that the Eoregoing and other disadvan-
tages of the prior art can be overcome by the lubricant composition of this
invention which comprises a major amount of mineral oil and an effective
amount of an additive combination of barium lanolate soap and barium sulfonate
wherein said barium lanolate soap is formed in situ by reacting barium
hydroxide with wool grease fatty acids.
The metalworking lubricant composition of the invention
provides both corrosion protection and good drawing characteristics; are
storage stable and particularly effective in inhibiting corrosion and providing
good drawability characteristics.
This invention also provides a method for protecting rolled
steel strip from corrosion, rust and stain and also provides good drawing
properties.
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Other advantages of this invention will in part appear
hereinafter and will in part be obvious:
DET~ILED DESCRIPTION 0~ THE INVENTION
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The compositions of t~.is invention contaln a major
proportion of a conventional lubricating oil9 and most prefer-
ably a mineral oil.
The mineral oils useful in the composition of this
invention will generally have a vi~scosi ty of at least about 40
lo SUS up to about 600 SUS at 100F. (37.7C.). More particular-
ly the mineral oils will have a viscosity of from abo~t 40 SUS
to about 350 SUS at 100F. (37.7C.) and preferably from about
75 to about 150 SUS at 100F. (37.7C.)
The mineral oils can vary widely in refinement and
they can be derived from a variety of crudes including paraf-
finic, naphthenic, asphaltic or mixed base. The mincral oils
can be treated by any o the conventional refining methods in-
cluding hydrogen treating, acid treating, extraction, etc. and
blends or mi~tures of such mineral oils can also be used.
paraffinic oils are particul.arly pre~erred.
In accordance with the invention, the compositions
contain barium lanolate. Barium lanolate can be ob~ained by
any known method and is generally obtained by reacting an inor
ganic barium donor compound with wool grease fatty acids. The
barium donor compound is generally selected from the group con-
sisting of barium hydroxide, barium oxide and barium carbonate
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1 with the hydroxide being particularly preferred.
2 While the barium lanolate can be obtained by any
3 of the known methods as described above, it has been found
4 that a particularly effective composition having good long
5 range stability is obtained when the lanolate is prepared in
6 a certain manner. This procedure involves the in situ forma-
7 tion wherein the wool grease fatty acids is reac~ed with bari-
8 um hydroxide octahydra~e in the presence of a small amount of
9 lubricating oil at ambient temperature. The formed soap is
10 then dehydrated by heating and the lubricating oil component
11 added slowly with stirring followed by addition of the barium
12 sulfonate component. This particularly prepared barium lano
13 late formula~ion had good anticorrosion, anti-s~ain and draw-
14 ability properties and also is stable over an extended period
15 of time.
16 Barium sulfonat.e is used i.n the composition of this
17 invention and such component will generally be a synthetic
18 sulfnnate derived from an oil soluble sulfonic acid having
19 the formula RS03H wherein the R group may be alkyl, aryl and
20 alkaryl. Generally, such sulfonic acids will have molecular
2L weigh~s of from about 200 to about 2500 and preferably from
2~ about 300 to about 700. Particularly preferred sulfonates are , .
23 those having an alkaryl group, e.g., alkylated benzene or alkyl-
24 ated naphthalene. Illustrative examples of such sulfonic acids
25 are dioctyl benzene sulfonic acid, didodecyl benzene sulfonic
25 acid, dinonyl naphthalene sulfonic acid, dilauryl benzene sul- i
27 fonic acid, lauryl cetyl benzene sulfonic acid, polyolefin
28 alkylated benz~ne sulfonic acids such as polybutylene alkylated
29 benzene sulfonic acid and polypropylene alkylated benzene sul f
~3~35
1 fonic acid.
2 Generally~ the lubricating mineral oil will form
3 from abou~ 70 to about 95, preferably about 80 to about 90
4 weight percent of the total composition. The barium lanolate
5 soap will generally comprise from about 1 to about 10 and pre-
6 ferably from about 1.5 to about 3 weight percent and the bari~
7 um sulfonate will comprise from about 5 to about 15 and prefer-
8 ably rom about 8 to about 10 weight percent of the total lubri
g cant eomposi-~ion.
10 The compositions of this invention may be formed by
11 adding the barium lanolate to the oil mixture while stirring
12 and then adding in the barium sulfonate component. As indi-
13 cated earlier, a preferred method of preparation is by forming
1~ the barium lanolate in situ through the reaction of barium
15 hydroxide octahydra~e with wool grease fatty acids.
16 The compositions of this invention exhibit good cor- ,
17 rosion, rust and stain protection while at the same time pro-
18 vide good drawing characteristics as well as protection of
19 metal surfaces from scoring or galling as they are processed. Il
20 The following ~xamples are further illustrative f ~!
21 this ;nvention and are not intended to be construed as limita-
22 tions thereof.
7.3 EXAMPLE I '
24 A barium lanolate soap was made in situ by reacting
25 1.7 parts by weight of wool grease fatty acids with 0.5 part
26 by weight of barium hydroxide octahydrate i.n the presence of
27 a small amount of mineral oil at ambient temperature (approx~
28 mately 70F., 21C.). The ormed soap was then heated to 250F.
29 (121C.) and hcld at this temperature until ~ehydration of the
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1 soap occurred at which point the dehydrated neutral soap was
2 gradually con~acted with 89.4 parts by weight of an oil mixture
3 of a light mineral oil, Faxam'40 (7302% by weight) and a paraffin-
4 ic oil, Me~tor*28 (26.8V/o by weight) with stirring. The heat was
turned off and the gradual addition of the oil was used as a
6 cool down mechanism. After the oil component was thoroughly
7 stirred into the soap component and a homogeneous mi.xture re
8 sulted 8.4 parts by weight of barium didodecyl benzene sulfonate
9 was added with stirring and the final ~ormulation was as follows:
Faxam*~O Mineral Oil65.4% by weight
11 Mentor*28 Para~finic Oil23.9% by weight
12 Barium Lanolate Soap2.3% by weight
13 Barium Didodecyl Ben~er~8.~% by weight
14 Sulfonate
15, The above prepared ~ormulation was clear and had a
16 viscosity of 95-105 SUS at 100~. (37.7C.), a flash point of
17 300F. (149C.) min. and a sul~ated a~s~l welght percent of 1.1- '
18 1.5. Also of significance, this formulation remained stable
19 and homogeneous for an extended period of over one year.
The lub'ricant composition prepared ~bove was coated
21 on steel strips'wh:ich were processed in a forlning operation
22 and subsequently test~d for corrosion, stain and drawing proper-
23 ties using standard tests including the Cleveland Q-Panel Test '
24 (Humidity Cabinet), the stack test for stain and friction
measurements as well as visual observation for galling ~nd
26 scoring. The resul.ts of these tests showed the lubricant com-
27 position to be suitable or the protection of the metal to
28 which i~ was applied against both corrosion and stain and addi-
29 tionally showed excellent drawing properties.
* Trad e Mark
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1 EXAMPLE II
2 A lubricant composition was prepared by slowly ad-
3 ding 65.6 parts by weight of Faxalin'~40 mineral oil to 2.0
4 parts by weight of barium lanolate wi~h stirring. This was
followed by the addition of 24.0 parts by weight of Mentor
6 28 paraffinic oil and 8.4 parts by weight of barium didodecyl
7 benzene sulfonate with continued stirring and the final form-
8 ulation was as follows:
9 Faxam~'40 Mineral Oil 65.6% by ~eight
Mentor*28 Paraffinic Oil 24.0% by weight
-11 Barium Lanolate 2.0% by weight
12 Barium Didodecyl Benzene 8.4% by weight
13 Sulfonate
].4 This formulation was applied to steel strips and
passed the standard tests ~or corrosion and stain and exhib-
16 ited satisfac~ory drawing characteristics in a manner simi-
17 lar to that described above in Example I. This formulation
18 unlike the formulation of Example I was slightly cloudy ~fter
19 being preparéd and showed evidence of separation after three
weeks of static storage.
* Trade Mark
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