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Патент USA US2115425

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Patented Apr.’ 26, 1938
Orville V. Mc'Grew, Chicago, Ill.
No VDrawing. > Application October 10, .1934, ‘Se
rial .No. 747,741. Renewed November 15, 1937
3 Claims. (Cl. 134-51)
This invention relates to improvements in com
air can be blown under pressure through the
position for treating metallic surfaces, vand more molten mass in the still. Thus at the outset of
particularly for preserving, protecting and insu
the process, 245 pounds of .gilsonite, 142 pounds
lating metallic structures such as railway car and of asphalt and 205 pounds of the ?sh oil pitch
5 automobile bodies, ships, ‘structural steel buildings ' are charged, into the still and the temperature ,
and all metallic surfaces against deterioration brought up to'about 350° F. At this point the
from rust and corrosion, transmission of heat and blowing is commenced and continued for about
sound, as well as the creation or ampli?cation of
twelve hours, this being the time vrequired to
sound-producing vibrations Within the structure.
In short, the object of the invention is to pro;
vide an e?icient and economical surface preserva
tive, heat-insulating and sound-deadening com
position for general use in building or structural
work, capable of being sprayed on to the surfaces
15 to be treated to any desired thickness, ‘and after a
short period of drying, to form a somewhat elastic
spongy coating having the combined properties
hereinabove enumerated.
Moreover, in its preferred form the composition
20 has a de?nite cellular texture calculated to _in
crease its capacity to resist the passage of sound
and heat therethrough and likewise to absorb vi
bration set up in steel plates and structural mem
Referring now to the ingredients which enter
into the composition and. thegeneral process fol
lowed in combining them, the base is preferably a
mixture of gilsonite, asphalt and ?sh oil pitch
melted down and then aerated by blowing air
30 through the molten mass to- give it the desired
spongy or cellular texture, whereupon suitable
hydrocarbons such as light mineral oils and naph
tha are added as solvents and ?nally quantities of
asbestos ?bre and sawdust are incorporated as a
35 binder and ?ller.
The following are the proportions of the pre
ferred ingredients entering into the composition
in terms of approximate percentages by weight:
Mid-Continent asphalt __________________ __
Sardine ?sh oil pitch ____________________ __
Asbestos ?bre ___________________________ __
The process followed in preparing the composi
tion will be best understood by describing the pro
50 cedure in making up an average batch using actual
525° F., the increased melting point of the still
ingredients due to constant cooling effect of the
air blown through the mass is acquired only after
the temperature of the ‘still has been gradually
brought up to maximum. vWhen the melting
point has been reached the basic ingredients are
then in solution and by reason of the air blown
therethrough are reduced to- a homogeneous mix- 4‘
ture, thoroughly impregnated with minute glob
ules of air and hence of a more or less ?uffy or
spongy consistency.
Now when the melting point has been reached
and‘ the mass reduced to the proper consistency ~
the blowing of the air therethrough is discon
tinued and the still allowed to cooldown to ‘about
300° F., whereupon the liquid hydrocarbons are
' This is preferably accomplished by ?rst empty
ing some 200 pounds each of oleum spirits and
naphtha into a separate tank and by means of
connecting pipe lines pumping the hydrocarbons
from the tank into the still and thence back into
the tank. In other words circulating the entire 3.)
mixture through the still and tank until the .whole
has been thoroughly mixed together.
When this step has been completed, the mix
ture is next pumped into another and preferably
closed tank capable of being maintained at a tem 40
perature of 150° F. by steam coils or otherwise,
and while in this tank the asbestos ?bre and dried
sawdust are added in amounts of 60 pounds of the“
the temperature of the still has been raised to a
considerably higher temperature, even as high as
?bre and 160, pounds of the sawdust. This step
naphtha _ _______________________ __‘_____
bring all of the ingredients up to the melting point
of, say, 215° F. This means, of course, that while
An asphalt still or like apparatus is used for
the melting and mixing of the basic ingredients,
the same being heated in any suitable manner
55. and also equipped with a blowing device whereby
in the process requires about 12 hours also, as it 45
is necessary to agitate the mass for a considerable
period of time in order to accomplish the complete
absorption by the ?bre and sawdust of the lique
?ed mixture. With the addition of the asbestos
?bre and sawdust the mixture assumes more or less
its ultimate consistency, although when allowed to
‘cool down to normal temperature it is slightly‘
more viscous but yet suf?ciently ?uid to be capable
of being sprayed onto a surface without reheating,
diluting or other'treatment.
7 ‘2,115,425
asphalt and ?sh oil pitch in a suitable still until
In its completed state ready for application, the
Composition retains 'to a large degree its initial
reduced to a molten state, forcing air through
the 'molten mass until thoroughly aerated, dis
light spongy texture attributable primarily to the continuing the aerating of the molten. mass and 7
blowingrtreatment in the earlier stages of prepa ~ allowing it to cool to a temperature slightly above
ration, which physical characteristic it retains the'melting point, mixing'a predetermined quan-_
subsequent to its application.
tity of light hydrocarbon'solvent with the molten
Thus, as previously pointed’ out, it is preferably mass, reducing the temperature of the resulting 2 _
applied as a coating or layer of. the desired thick
mixture to approximately 150° F., incorporating
ness adhering tenaciously to the surface without given quantities of asbestos ?bre and sawdust
10 running or spreading dunevenlyrafter its initial ,7 into the mixture and agitating the same until
application. A short period is. required for set- ' said asbestos and sawdust are completely satu~
ting and drying after while 1» it, becomes: a tough . rated.
but slightly elastic coating” era; rather coarse
2. The method’ of producing a composition’ of "
surface texture 'With interccmmunicating voids" .matter- for the purpose'described consisting of"
or channels, extending throughoutv the ,body' of heating predetermined quantitiesvof' gilsonite as-‘
the mass. The composition, however, is not 1' phaltum and ?sh oilpitch in a suitable still until 1
f _porous inrth'e sense thatitpérmits'the passage '~ reduced to: a molten state, forcing air under pres
of ' moisture therethrough, but "rather" approaches sure through the molten mass until thoroughly
What may be termed a cellular texture which
‘serves not only to increase the bulk, thuspermite
ting greater surface coverage perunitof volume
. ,of'the composition, but it"is also of marked ad
vantage in increasing ,thegsound and heat insu
aerated and the melting point of the molten mass
is at a temperature of approximately 215°
add- _
ing a predetermined quantity of light hydrocar
bon solvent to the molten mass, removing the
resulting mixture from said stillfto a closed tank
lating properties of thecoating.
H r '
vmaintained at a temperature of approximately :1;
embodiment of’ 150° F., and incorporating giveniquantities of as
2,5 vIn setting ' forth the preferred
my invention vI amaware that different sub bestos ?bre and dried sawdust into the mixiand
stances maybe, substituted for those mentioned
whole until the asbestos andsaw~
with equally satisfactory results as well as dif~~ ‘' agitatingthe
have become completely saturated.
fere'nt» grades or sourcespfsthesame ingredient. dust
'3. The 'methodof producingta' composition of 230
Thus'in'specifying asphalt rel-prefer itollyr'use the , matter
for the purpose described consisting of
kind known’ [to the trade:
as. “lVlid-Qontinent”
more.’ plentiful
‘ and theref : heating vpredetermined quantities of gilsonite,
chie?y because it is.“
crude asphalt and fish oil pitch in a suitable still
until reduced to a molten state, forcingair'under
sardine ‘?sh on pitch in Vpreferenceto other ?sh»
oughly aerated,
the molten mass
until of
the j
linseed on, since ,iiti' is ' pressure
lor drying Voilsjor, even gr-aw
considerably cheaper; and'quite .as satisfactory. molten mass and allowing it ‘to cool'at a tem
'lnrshoruvotherj ‘things ‘being equal, I prefer. to peratureeslightly above‘ the melting ‘point,’ mix- 7'
use'the less expensiveingredients so long as the ing a predetermined quantity, of light hydr‘o- .
fore : less, expensive. ' SQ‘too,¢_ITprefer _to :use a‘
qualityv is not ‘affected by so’ doing“ Moreover,
carbon solventrwith the molten mass :by pumping
the proportions of theingredients employed'rnay
" be varied somewhat from
the sameintojthe still from ,a suitable<recep~
herein ,set
tacle, removing'the resulting mixture from said
forth without-materially’ affecting the character,
to' a closed tankand maintained therein at r
properties," and usefulness of the composition for’ V still
a temperature oflapproximately 150° F., and in
- the purposes for which it is intended.
given quantities of asbestos fibre“ and
Havingsetrforth the invention in its'preferredf corporating
dried sawdust'into the mix and agitating the;
,whole until the asbestos and ‘sawdust havebe: 7'
l. The method of, producing ancomposition of
matter for the purpose
described‘ 'consisting‘g‘of
heating predetermined quantities of vgils'onite,
. j
V. M0(ilR’E-Vv',,v
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