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Патент USA US3039970

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United States Patent 0 ’
Patented June 19, 1962
ethyl group and R7 is a methyl group. A particularly
preferred compound meetingthe aboveformula?szmethyl
mercuric acetate basis performance. Examples-of other
useful compounds include:
Inc., .a corporation of Delaware
NolDrawing- Filed June 2,-‘1958,-'Ser. No. 738,981
Ethyl mercuric acetate
3'Claim‘s. (Cl. 252;-33.3)
Propyl mercuric acetate
Butyl mercuric acetate
This invention relates to a'soluble'oil inhibited against
M ethoxymethyl mercuric acetate
bacterial. action- More particularly, it relates to a bac
Methoxyethyl mercuric acetate
tericideecontainin'g solubleoil particularly useful in the 10 M ethoxypropyl mercuric acetate
form of an emulsionasametal.working lubricant.
Ethoxymethyl mercuric acetate
Soluble oils' generally'are composed of mineral oil or
Ethoxyethyl mercuric acetate
mixtures of mineral iandvegetable oils, and an emulsifying
Ethoxybutyl mercuric acetate
agent to lower the interfacial tension‘between the oil and
Propoxyethyl mercuric acetate
large volumes of water whereby emulsions of the oil-in 15 Propoxybutyl mercuric acetate
water type may be‘ easily formed; The emulsifying
Butoxymethyl mercuric acetate
agents commonly used-include-soaps-of petroleum sul
Butoxyethyl mercuric acetate
fonic acids, naphthenic’acids, fatty acids,’ rosin and tall oil.
Methyl ‘mercuric propionate
Soluble oils usually containcouplingragents and small
Ethyl mercuric propionate'
Edward'O." Bennett; Houston, Tex, assignortoTexaco
amounts of water to stabili'ze'the composition prior to
Methoxyethyl mercuric propionate
emulsi?cation. Various’lubricantadditives are also used
Methyl mercuric butyrate
to correct or improve'certain characteristics of the soluble
Ethyl mercuric butyrate
oil orsoluble oil emulsion.
Methoxyethyl mercuric butyrate
The oil-in-water emulsions are formed with water-to~
These compounds are effective in soluble oil emulsions
oil ratios ranging from 5:1 to-lOOzl. The more dilute
in amounts ranging from 25‘ to 2500 parts per million.
The‘ preferred‘ amount is‘ about 100 parts per million
emulsions, from 25 'z-l‘to- 100:1 are preferred for’ cutting
oils which are used as lubricants and coolants in high
speed metal 'turning'operations.
The soluble‘- oil itselfis shipped to the user, in a sub
stantially sterile condition. However,- bacteria can be in
troduced in an emulsi?ed soluble oil either through the
water used‘in the preparation thereof or’ through con
tamination by- the workers or from the air’ during use.
The bacteria, if ‘allowed to grow unchecked, will even
tually cause breakdownof the emulsion and curtail the 35
based on performance and cost. The amounts‘of these
bactericides incorporated-in the soluble oil per se ranges
from about 0.1 percent to about 6 percent by weight based
on the oil. These amounts are sufficient to obtainthe
proper concentration of bactericide whenthe emulsion
is formed.
The soluble oil mainly comprises a‘mineral lubricating
oil and an emulsifying‘ agent. The mineral oil is prefer
ably a naphthene base distillate oil although mixed par
use for which it was intended.
a?in-naphthene base distillate oils are at times elfectively
In addition tothe above‘occurrence, a serious odor
employed. Napht-hene base distillate fractions are desir
problem is created by certain bacterial growth in the cut
able because vof their better emulsi?cation properties and
ting ?uid. Itisbelieved that initially the growth of cer
tain aerobic bacteria takes place with a resulting slight 40 stability. In general, re?ned base oil fractions having an
SUS viscosity at» 100° F. between 70 and ‘800 are used in
breakdown of the emulsion. During shutdown periods of
they formulation of the soluble oils of this invention.v
The emulsifying agents useful in the present invention
are those known in the'art. Examples of these emulsi?ers
the'cutting'm'achinery, as on weekends and holidays, cer
tain anaerobic sulfate-reducing bacteria grow quickly in
the used cutting?uid due-toiinadequateaeration in the 45
include oil soluble metal petroleum'» sulfonates; alkali
quiescent'system- and to the conditionsormaterial pro
metal naphthenates, and resinates, salts of fatty and car
vided by therprior growth of aerobic bacteria inthe ?uid.
boxylic acids, such as guanidine salts of high molecular
The presence of large amounts of sulfate-reducing bacteria
weight fatty acids and alkylolamine salts of carboxylic
causes severe odor problernsdue to the formation of sul
acids containing at'least 10 carbon'atoms, alkali metal
tides and the odor is particularly noticeable on Monday
mornings afterweekend-shutdown periods. The growth 50 salts of tall oil, etc. These soaps or salts are'usually
of anaerobic bacteria also causes a quicker and more
severe emulsion breakdown than is caused by aerobic
bacteria .necessitatingdraining and cleaning of the cutting
?uid system and the additionvof new cutting ?uid.
The problem of ?nding a: satisfactory bacterial inhibitor
for a soluble oil is made di?icult by a number of factors
formed with ‘sodium because of the lower costand avail
ability, but potassium is also used. Mixtures of emulsi
?ers, for example a mixture of sodium naphthenate and
sodium petroleum sulfonate, a mixture of sodium resinate,
sodium naphthenate and sodium petroleum sulfonate, and
a mixture of guanidine stearate and triethanolamine stear
which must-beconsidered. These factors include toxicity,
oil solubility, storagevstability, emulsion degradation, ad
ate have been found extremely useful.
The total emulsi?er concentration is between 10 and
teria for a suf?cient period duringthe vlife of the oil.
In accordancewith' the present invention .a soluble oil
composition which’will'rmeet'the above requirements con
ditive compatibilityand- growth inhibition of harmful bac 60 20 percent by weight of the total soluble oil composition
with concentrations between 12 and 16 percent usually
tains abacteria-inhibiting‘amount of a"comp'ou1'1d having
thefollowing general formula:
Minor amounts of couplingragents' are also advanta
geously employed in~the soluble oil composition to im
prove the texture and stability thereof. Those coupling
65 agents useful in» this invention include mono and polyhy
droxy alcohols, ether-alcohols and phenols. Exampleis'rof
these compounds include ethyl, isopropyl,- n-propyL' iso
wherein Kiisz'an'alkyl radical havingfrom 1 to 4 carbon
butyl, n-butyl and n-amyl alcohols; ethylene glycol, diethl
ylene glycol and propylene glycol; ethylene glycol mono
atoms or an: alk'oxyalkyl radical wherein’ each- alkyl ‘group
has Efrom 11 to 4 carbon‘ atoms :and R’ is' an‘ alkyl group 70 ethylether (Cellosolve), ethylene glycol monois'opropyl
havingirfrom- 1ito-3rcarboneatoms.v Preferred compounds
of the above class are those wherein R is a methyl or
ether, ethylene glycol monobutylether, ethylene glycol
mono-n-pentylether, ethylene glycol mono-n-hexylether,
diethylene glycol monoethylether (Carbitol), diethylene
Table I
glycol monobutylether and cresol. The concentration of
the coupling agents in the soluble oils is usually between
No. of Effective Days
of Inhibition
0.1 and 1.5 percent by Weight. A preferred coupling agent
is ethylene glycol monobutylether at a concentration of
about 0.6-1.0 percent by weight.
In preparing the soluble oil of this invention a small
amount of water is preferably used to make the soluble
Sodium o-phenylphenate ___________________ -o-Phenyl 'n‘n Pnnl
oil ?uid and to prevent oil separation, or strati?cation of
ReSOrcin n1
the emulsion, upon mixing the soluble oil with much 10 Resorcinol dibenzoate_____
Alkylamine o-phenyl pheno
larger amounts of water. The water content, to stabilize
the oil, usually falls between 1 and 4 weight percent. A
Mercuric naphthenate ______ __
_ ___
Zinc salt of alkyl—N—propylene-diamine-penta
Pentachlorophon nl
water content of about 2 percent has been found to be
particularly effective in the soluble oil composition.
Tetradecylamine salt of o‘phenyl phenol .... __
Other useful lubricant additives, to improve certain 15 Dichlorophene
Copper naphthenate, 8%. _ _
characteristics of the soluble oil, are at times used in the
Azochloramide ___________ __
composition. These include, for example, rust prevent
atives such as triethanolamine, extreme pressure and
Dimethylaminomethyl phenol (0 and p mix
_____________________________________ __
Diethyl acid pyrophosphate ________________ _
m-Oresol- _
dent thereby correcting said problem before serious deg 25
radation of the emulsion occurs.
Mixture of 2,8-diamino-10~methyl acr
In order to determine the value of compounds, known
or expected to have bacteria destroying properties in
water solutions, as bactericides in soluble oil emulsions,
Mixture of 2,8-diamino-l0-methyl acridinium
chloride and 2,8-diamino acridine, HCl $01..
Hydroxylamine, H01 sol
Phenylmercuric acetate _____________________ __
30 Organic mercurial (Exact chemical composi
the tubes had cooled to atmospheric temperature, 0.5 CAD C21
ml. of a composite used cutting oil sample or inoculum
tion not known)
Cyclohexyl chloride
24Amino-L4 naphthoquinone _______________ __
Propyl-p-hydroxybeu cafe
Butyl-p-hydroxyhen nate
p-Chloro-m-xylenol _________________________ __
Lauryl isoquinolinium bromide _____________ __
Phenylmcrcuric monoethanolammonium ace
Zinc salt of dimethyl dithiocarbamic acid
of several users. The bacterial content of the inoculum
3,5-l_)dibromo-2-phenyl mercurioiq7 benzoic
was determined and in every case the tubes were inocu
Sodium salt of dibromohydroxy mercuric
lated with a standard known number of viable bacteria. 40 ?uorescein (mercurochrome) ______________ _
mercuric salicylate __________________ -_
Tubes of sterile uninhibited uninoculated emulsions and
1—Hydroxy-2(1H)-pyridinethione (zinc salt)
All tubes were placed on a shaking machine
making 209 oscillations per minute. Immediately after
chloride and 2,8-diamino acridine _________ __
of the emulsion in test tubes. The tubes were then auto
claved at 15 pounds steam pressure for 15 minutes. After
uninhibited inoculated emulsions were employed as con
Beta-propiolactone- _
iLlPhenyl ethylamine _______________________ __
Malouic acid _ _
1,2-Dibromo-1,l-dichloroethane _____________ __
was prepared by mixing the “spoiled” cutting oil samples
2,4,6Jl‘ri(dimethylamino-methyl phenol) ____ __
soluble oil before the oil is emulsi?ed. It may also be
incorporated in the emulsion at the time it is prepared
and before any serious bacterial problem occurs, or it
is added to the emulsion after a bacterial problem is evi
a screening test was used. This test consisted of prepar
Tetrachlorophenol __________________________ __
oiliness agents, and settling agents.
The bactericide of the invention is incorporated in the
ing the cutting ?uids or soluble oil emulsions and adding
100, 500, and 1000 p.p.m. of each bactericide to 20 ml.
Mixture of 4 and 6 chloro-Z-phenyl phenol____
Methylene bis-phenol
. _
1 - Hy)droxy - 2 - (1H) - pyridinethione (copper
Morpholine silico?uoride.
Rosin amine silico?uoride_
inoculation of the emulsions and at 24 hour intervals for 45 Methyl mercuric acetate____________________ _
a period of 7 days, each tube was tested for the presence
of viable bacteria by inoculating nutrient broth with a
Inthe above data, 100 p.p.m., >500 p.p.m. and 1000
small standard volume of emulsion. The broth tubes . p.p.m. correspond respectively to about 0.25, 1.25 and
were incubated for 48 hours and then examined for
2.50 percent by weight of the potential bactericides in the
bacterial growth. Those bactericides which caused the 50 soluble oil before the formation of the 25:1 dilution
inoculated emulsions to become sterile within the seven
day test period were considered promising and were sub~
In addition to the above data, the compound methoxy
jected to further testing. Of over 250 known bactericides
ethyl mercuric acetate was tested and found to inhibit
tested in the above manner less than a third were con
bacterial growth in the previously described screening
sidered promising for bacteria inhibition of soluble oils. 55 test. However, this compound was not tested in the" \
Effective materials found with the above test procedure
Open System Test.
were further tested in an Open System Test. The proce
From the above data, it can easily be concluded that
dure consisted of placing 3.0 gms. of powdered iron and
the mercuric ‘compounds of the invention are exceptional
3000 ml. of a 25 :1 soluble oil emulsion containing the
for supprwsing aerobic bacterial growth in soluble oil
experimental bactericide in a one gallon jar and inocu 60 emulsions.
lating with a known quantity of bacteria. The soluble oil
Some of the compounds listed in the foregoing Table I
consisted of a naphthene base distillate oil having an
.SUS viscosity at 100° F. of about 72, 7.5 percent sodium
were effective for more than 50 days in this test. How
ever they were objectionable as either completely insolu
ble in soluble oil per se, decomposed in the soluble oil
resinate, 12.0 percent sodium petroleum sulfonate, 1.0
percent ethylene glycol monobutylether, 0.5 percent tri 65 in storage, degraded soluble oil emulsion properties, or
ethanolamine and 2.0 percent water. The system was
could only be incorporated in the soluble oil by utilizing
then aerated for 5 days and allowed to stand quiescent
a special technique which entailed adding the potential
for 2 days each Week. Immediately after inoculation
bactericide to ethylene glycol monobutylether, which is
and twice a week thereafter duplicate standard plate 70 usually incorporated as a coupling agent, heating this solu
tion to 130° F. until the solution turned clear. The solu
counts were made. The inhibitors were considered effec
tive as long as bacteria counts remained less than
tion was then able to be added to the soluble oil.
Obviously, many modi?cations and variations of the in
The following table shows the results of the Open
vention, as hereinbefore set forth, may be made without
System Test on the potential bactericides:
75 departing from the spirit and scope thereof, and therefore
only such limitations should be imposed ‘as are indicated
in the appended claims.
I claim:
1. A soluble oil which is normally subject to bacterial
spoilage in metal working operations consisting essen
tially of a major proportion of mineral lubricating oil
and 10-20 percent by weight of an oil~in-water emulsi
fying agent, containing a bacteria inhibiting amount of
methyl mercuric acetate.
2. A soluble oil according to claim 1 wherein the said 10
emulsifying agent is selected from the group consisting
of oil-soluble ‘alkali metal petroleum sulfonates, naph
thenates, fatty acid soaps, resinates ‘and tall oil salts and
guanidine and alkylolamine salts of aliphatic carboxylic
acids, and mixtures thereof.
3. A soluble oil emulsion which is normally subject
to bacterial spoilage in metal working operations com
prising from about 25 to 100 parts of water, about 1 part
of an emulsi?able oil composition consisting essentially
thenic acid, sulfonic acid, rosin and mixtures thereof,
from 0.1 to 1.5% by weight of a coupling agent selected
from the group consisting of monohydroxy alcohols, poly
hydroxy alcohols, ether-alcohols, phenols and mixtures
thereof, and from about 1 to 4% by weight of water;
and wherein said bacterial spoilage is inhibited by from
50 to 1000 parts per million of methyl mercuric acetate.
References Cited in the ?le of this patent
Englemann et a1. _____ __ Mar. 12,
Englemann et al _______ __ Mar. 12,
Tisdale et a1. ________ _._ June 23,
Frazier ______________ __ Sept. 29,
Cafcas et al. __________ __ Feb. 2,
Pivnick et ‘al.: “Disinfection of Soluble Oil Emulsions,”
of a major proportion of a naphthene base distillate oil 20 Journal of the American Society of Lubrication Engineers,
having an SUS viscosity range at 100° F. of from 70 to
March 1957 (pages 151-153 relied on).
“Fundamentals of Microbiology,” by Frolbisher, 5th
800, from 12 to 16% by weight of a sodium salt of a
edition, 1953, by W. B. Saunders Co., page 3 relied on.
compound selected from the group consisting of naph
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