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Патент USA US3060066

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United States Patent 0
3,000,047
Patented Oct. 23, 1962
1
2
tinued to be pumped fully into the waterabentonite phase
3,060,047
COATING MATERIAL 0F BLENDED PITCH AND
TAR EMULSIONS
and the agitation is continued ‘for at least an hour or
longer to complete emulsi?cation.
_
Olin D. Graft and Malcolm Mitchell, Indianapolis, Ind,
assignors to Reilly Tar and Chemical Corporation,
Indianapolis, Ind., a corporation of Indiana
N0 Drawing. Filed Apr. 6, 1960, Ser. No. 20,253
4 Claims. (Cl. 106-277)
This invention relates to a discovery that, by blending
together separately prepared tar-in-water and pitch-1n
water-emulsions, a coating of these blended emulsions
"
‘
_
'
"
A second emulsion is prepared as follows:
Water in amount within the range of 38 to 44 percent
by weight of the completed emulsion is brought up to a
temperature of 90 degrees C.
Powdered or pelletized powdered bentoni-te in amount
by weight in the range of 3.5 to 4.0 percent is stirred
10 or agitated into the water until a smooth paste develops.
A re?ned coal tar is selected having a ?oat test con
sistency (ASTM Dl39-49) of 75-220 seconds at 50 de
may be applied directly to metals, such as steel, even in
grees C., further identi?ed as RT-10, RT-ll, or RT-12,
the absence of a primer, to obtain an outstanding pro
tective coating. The steel does not rust under the coat 15 as outlined in ‘speci?cation M52-42, page 32 of part I,
Standard Speci?cations of Highway Materials, Seventh
lng.
-
The coating involving this invention may be applied
Edition 1955, by American Association of State Highway
to the ‘blend constituting this invention, a roo?ng pitch
ly the tar-?ller-surfactant phase under high agitation of
percent by weight of the ?nal emulsion, is added a ?ller
desired. The mixture is agitated until homogeneous.
.O?icials. An amount of approximately 32-38 percent
to the metal in any suit-able manner ‘as by spraying, Clip
of the selected tar is placed in an agitator tank at ‘a tem
ping, brushing or wiping on. The coating lends itself to
normal drying at atmospheric temperatures and also to 20 perature ranging from 90 to 100 degrees C., to which tar
is ?rst added one of the surfactants above indicated as
baking on the metal. A peculiarity is noted in that oily
being usable, such as the polyoxyethylene sorbitan mono
coated metal may be sprayed by or dipped in the blend
oleate, in the weight proportion of 0.1 to 0.3 percent,
ed emulsions and good wetting and coverage by the
and secondly, a ?ller selected from powdered ibentonite,
coating on the metal is obtained. By the term “oily
clay, talc, slate ?our, mica, or silica, in weight pro
coated” is meant that oil coating normally adhering on 25 ball
portion of 8 to 14 percent.
metals such as they come from rolling mills, but not any
Into the phase of waterabentonite paste ranging in tem
normally ?owing oil.
perature of from 80 to '90 degrees 'C., is pumped slow
As an example, one of the two emulsions entering in
the intermixture until all tar is added and completely
emulsion, is prepared as follows:
.
30 emulsi?ed.
A coal tar roo?ng pitch having the properties of a
The
sodium
salt
of
lignin
in
the
amount
of
0.1
to
0.3
softening point cube in water (ASTM D61-38) of 140
percent by weight of the ?nal emulsion is added by dis
to 155° F. and insoluble in carbon disulphide (ASTM
solving it in dilution Water. The dilution water is added
134-52) 15 to 30 percent, is melted down in a mix tank
in an amount varying from 5 percent to ‘10 percent of
and is cut back with 10 percent by weight of anthracene
the
?nal emulsion weight depending upon the consistency
oil. To this cut back pitch in the amount of 33 to 40
Both emulsions, one at a time, can be made by sepa
rate feeding of the tar-?ller and waterbentonite phases
20 percent of the ?nal emulsion and the temperature is
to a colloid mill.
maintained between 105 and 115° C.
40
These two emulsions are then ready to be intermixed
Anthracene oil may be de?ned (American Woo-d Pre
or blended together to form the coating product.
servers Association P-7-58) as ‘a coke oven tar distillate ’
The two emulsions are blended in the ratio of 3 parts
with not more than ‘10 percent distilling at 235° C. and
of the first emulsion to one part of the second emulsion.
not less than ‘65 percent distilling at 355° C.
is varied slightly depending upon
>Water is metered into an emulsion tank in quantity of 45
how it is to be applied. For example, to the blended
from 42 to 47.2 percent by weight of the emulsion and
emulsion is added0.75 percent of polyoxyethylene sor
is heated to between 80 and 90 degrees C. Powdered
bitan mono-Oleate when the product is to be applied as
or pelletized powdered bentonite of from 3.2 to 4.5 per
a spray. When the product is to be employed as a dip
cent by weight is added to the heated water [and the mix~
ture is agitated until it is a smooth paste, free of lumps, 50 (metal dipped into it), 1.25 percent of either sorb-itan
mono-oleate or sorbitan monol-aurate and 0.2 percent of
at which time the paste temperature may be in the range
of from 50 to 70 degrees C.
Zildlllm
isopropylnapthalene sulfonate are added to the
end.
A'surface acting agent, a surfactant, is selected from
The
two
emulsions may be added together in other
one of the following:
_
such as talc or ball clay, within the range of from 8 to
proportions such as 4 to 1; 2 to 1; and 1 to 1. The l
Sodium isopropylnaphth'alene sulfonate (trade name 55 to 1 ratio dipped coating under impact, when baked, is
Aerosol OS)
less satisfactory than the 4-1, 3-1, and 2-1 ratios, while
Polyoxyethylene sorbitan mono-oleate (trade name
the 1-1 ratio sprayed on coating wetted the oily metal
Tween 81)
better than the 3-1 and 4-1 ratio sprayed blends. The
Sorbitan mono-oleate (trade name Span 80)
2-1 ratio ranks below the other ratios. The 3-1 ratio
60 is the conventional blend.
Sorbitan monolaurate (trade name Span 20)
Sodium salt of lignin from alkaline processes of pulping
Additional usable emulsions of tar are set out in the
southern pine wood (trade name Indulin 'C)
following table wherein the ?gures are percentages
by
Weight of the ?nished emulsion.
One of these surfactants such for example, as poly
oxyethylene sorbitan mono-oleate is added to either the
roo?ng pitch-?ller phase or the water-'bentonite phase
65
prior to intermixing in the emulsion tank, in the propor
tions of ‘from ‘0.1 ‘to 0.4 percent by weight of the ?nal
emulsion.
The ?lled, cut back roo?ng pitch as above described
is slowly pumped into the mixture in the emulsion tank 70
while great agitation is maintained. The pitch is con
Water; __________________________________ __
KWK Bentonite _________________________ __
3.
RT 10, RT 11, or RT 12 (Re?ned Goal Tar) -
33.
Tween 81 ________________________________ __
Filler ______________________ __
Indulin C __________________ ._
_
__
Dilution Water _______________ __
Additional usable emulsions of pitch are set out in
8,060,047
-
-~
a
the following table wherein the ?gures are percentages
by weight of the ?nished pitch emulsions:
46
47. 2
Pwd. Bentonite __________________________________ ..
3. 2
4
4. 5
Cut back roo?ing Pitch _______________________ _‘..___
Water“
40
l4.. 17
33
l6.. 28
40
.3
8
Tween 81
42
_
Filler ............................................. "1
4
Weight of anthracene oil; adding ‘a ?ller in the range of
8 to 20 percent to the cu'tdback pitch while maintaining
a temperature range of from 105—115 degrees C. as one
phase; mixing into 42 percent to 47.2 percent of water
by total emulsion weight in a temperature range of ap
proximately from 80 to 90 degrees C., bentonite 3.2
to 4.5 percent of total emulsion weight ‘and agitating un
til a smooth paste is formed as another phase; ?owing
the pitch-?ller phase into said waterdbentonite phase and
Therefore it is to be seen that the discovery that two
agitating to complete an emulsion; a surfactant being add
separately prepared emulsions as constituted within the 10 ed to either one of said phases before ?owing together;
ranges set forth ‘by the foregoing examples, may be blend
ed in the indicated proportions to give new vand ‘unex
pected results as a metal coating. Coatings constituting
either one alone of the tar or pitch emulsions have been
employed with inferior results, but the surprise of ob
mixing together re?ned coal tar at a temperature range
of 90 to 100° C., from 32 to 38 percent by tar emulsion
weight and a ?ller of from 8 to 14 percent by tar emul
sion weight and a surfactant forming a tar-?ller phase;
mixing into Water ranging in amount from 38 to 44 per
cent by tar emulsion weight comminuted bentonite 3.5
to 4 percent by weight as a waterabentonite phase; ‘flow
taining a vastly superior coating came upon lblending
largely ‘by accident the two types of the emulsions.
We claim:
ing the tar-?ller phase into the water-bentonite phase
1. A coating composition product comprising a blend
ranging in temperature from 80 to 90 degrees C., and
of roo?ng pitch emulsion and of coal tar emulsion, Where 20 agitating until a tar emulsion is formed; and 'blending
in the roo?ng pitch emulsion comprises soft pitch 33 per
together the pitch and tar emulsions in ratios of from 1
cent to 40 percent ‘by weight of the ?nished pitch emul
to l to 4 to l.
'
sion; water, 42 percent to 47.2 percent, lbentonite 3.2
‘ 4. The method of claim 3 in which the sodium salt of
peucent to 4.5 percent, ?ller 8 to 20 percent, surfactant
lignin ranging from 0.1 percent to "0.3 percent by weight
0.1 percent to 0.4 percent; and the coal tar emulsion 25 in dilution water in 5 percent to 10 percent by weight,
comprises water 38 percent to 44 percent by ?nal tar
both Weights being that of the ?nal Weight of tar emul
emulsion weight, bentonite 3.5 percent to 4.0 percent,
sion, is added to the tar emulsion.
?ller 8 to 14 percent, tar 32 percent to 38 percent, and
surfactants 0.1 percent to 0.3 percent each.
References Cited in the ?le‘ of this patent
2. The product of claim 1 in which said pitch is cut 30
UNITED STATES PATENTS
back with 10 percent anthracene oil.
Gabriel et al. ________ __ Aug. 24, 1943
3. The method of making a metal coating composi
2,327,882
Farris ________________ ._ July 5, 1955
tion which comprises heating to melting point a soft coal
2,712,506
tar roo?ng pitch; cutting it back with 10 percent by
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