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Патент USA US2108715

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Patented Feb. '15, 1938
' 2,108,715
UNITED STATES. PATENT
_
OFFICE
2,108,715
PROCESS or, COATING WORKED SOLID
‘MATERIALS
-
a
Albert Koch, CoIogneP-Deutz, Germany,
or
to I. G. Farbenindustrle Aktiengesellschaft,
Frankfort-on-the-Main, Germany
No Drawing. Application April 9, 1934, Serial '
No. 719,807. In‘Germany Aprll 13, 1933
4 Claims. (Cl. 91"—-68)
it has been heretofore possible. As water‘ im
,, The present inventionrelates to an improve
permeable ?lm-forming materials there can be
ment in or a modi?cation of the process of coat
used, for instance, lacquers prepared from natu
ing worked solid materials, such as tubes or ves
sels, with vulcanizable mixtures of soft or hard ral or synthetic resins, such as shellac, copal,
polyvinylchloride, condensation 5
5 rubber and e?ecting vulcanization of the said, polystyrene‘,
mixture while being in contact with the worked ' products from polybasic acids and polyhydric al
solid materials.
cohols, condensation products from phenolic
~
It has been proposed to coat worked solid ma
terials, such as tubes or vessels, with vulcanizable
mixtures of soft vand hard rubber and to effect
vulcanization of the said mixture in order to pro
tect the worked materials against the attack of
acids or other chemically active materials. The
vulcanization of the vulcaniz‘able mixtures has
hitherto been effected by means of hot water or
hot aqueous solutions of inorganic salts, such as
sodium chloride. As a matter of ‘fact vulcanizable
mixtures in order to be suitable for this method
of working must contain besidesthe usual auxil
solvents or suspensions in organic solvents or in _
This method of working is accompanied by sev
eral disadvantages, chief among which is the fact
that during the vulcanization process part of the
(After the vulcanization is ?nished, the ?lm-form
vulcanization accelerators so that a, complete vul
canization of the mixtures can be effected in
spite of the relatively low vulcanization temper
atures'.
accelerators or other ingredients of the vulcan
ization mixture is dissolved or decomposed due
30 to the long-continued contact with the hot water
or the hot aqueous solution of salts. Thereby
the drawback is involved that the upper layer of
the coated materials is not completely vulcan
'35
softening agents, ?lling materials, pigments etc.
The ?lm-forming material can be applied on the
surface of the vulcanizable rubber mixture in any
desired manner, for instance by brushing or
spraying the same in form of solutions in organic
water, and causing the layer to dry.
Coatings of vuleanizable rubber mixtures,
which have been applied to worked solid mate- 0
rials and have been provided with a protective
coating as described above, can be vulcanized by
means of hot water or hot solutions of salt with
out involving the danger of dissolving or decom
posing the vulcanization accelerators or other in- 25
gredients contained in the vulcanizable mixture.
20 iary agents and ?lling materials strongly acting
'
bodies and/or urea with aldehydes, furthermore,
elastic oil lacquers, lacquers of chlorinated caou
tchouc, cellulose ethers, isomerized caoutchouc 10
and so on, if "desired, in thepresence of suitable
ized, particularly if mixtures of hard rubber are
employed. These insu?iciently‘ vulcanized coat
ings are easily attacked and destroyed by chemi
cally active materials.
'
Y
I have now found that the disadvantages in
herent to the hitherto applied method of working
40 can be completely overcome by applying a strong
ly adherent water impermeable layer of film
forming materials onto the rubber mixture prior
ing materials can be left on the caoutchouc layer
or they may be removed, for instance, by means
of suitable solvents or by mechanical means. If
strongly resistant ?lm-forming ‘agents are em
ployed it is preferable not to remove the same,
since they themselves show a remarkable protec
tive effect for the rubber coatings.
‘
The following examples illustrate the inven- 35 '
tion, without, however, restricting it thereto, the
parts being by weight:
Example 1
An iron container, which‘ cannot be trans- 40
ported, is coated with a double sheet of 4 mm.
thickness of a hard rubb'er mixture prepared on
'to ‘vulcanization. It is, therefore, the object of ' the calender. The hard rubber mixture consists
my present invention to provide worked solid ma
of the following ingredients:—
terials, such as tubes or vessels, particularly such
materials as are not transportable, with coatings
consisting of vulcanizable rubber mixtures and
having applied thereon a strongly adherent water
impermeable layer of a suitable ?lm-forming ma
terial,.these coatings being not subject to the
danger‘of being insu?iciently vulcanized. There
fore, the worked materials provided with coat-é
ings of vulcanized ‘rubber in accordance with the L
‘ present invention are far better protected-against
55 the attack of chemically active substances than
~
Smoked
I
Parts
sheets ___________ __\____________ _.. 100
Ground hard rubber____________ _.'. ______ __
Kaoline- ‘
‘
Zinc oxide___
_
Magnesium mrirle
Sulfurm, '
w‘
‘
50v
N
____-
45.
50
25
10
1
Tetramethyl thiuram‘disulfide ___________ __
42
5
The surface of the mixture of unvulcanized
hard rubber being thus applied- on the iron con- 55
2,108,715
tainer, is painted several times with a solution of
chlorinated caoutchouc of the following compo
sition:--—
p
.
'
>
Ewample 4
>
Parts
Chlorinated caoutchouc ________________ __.
24
Organic sulfur-containing compounds, ob:
tainable in a known manner by reacting ‘
with sulfur upon homologues of benzene,
10
tainer is?lled with water and the vulcanization
is effected as described in the foregoing examples. _ 1
a An iron container, which cannot be ‘transport?
ed, is coated with a double sheet of 4 mm. thick
ness of a hard rubber mixture prepared ‘on the
calender. The hard rubber mixture consists of
such as toluene or xylene in the pres
ence of a small amount of aluminium
the following ingredients:--
chloride (see U. S. Patents ‘1,426,430 and
Smoked sheets
1,427,182) _
__
_.
4-6
Parts
100
Ground hard rubber.v ___________ __-______ __
Iron oxide red, or titanium dioxide _____ __ 8~12
Kanlinp
Toluene-
20 _
Zinc oxide
38
Magnesium oxide
15 Xylene
__
After the solvent has been completely evap
orated the vessel is filled with water and ‘the
water is kept boiling for about 48 hours by in
troducing steam.
20
Example 2
A container is ‘coated with a. layer of vulcan
izable rubber by spraying thereon several times a
25 mixture of:
'
,
'
50
.
56;
___-
25
10
Sulfur ______________ _.. _________________ __
42
Tetramethyl thluram disul?de ___________ __
5
The surface of the mixture of unvulcanized hard
,rubber being thus applied onto the iron con
tainer is painted twice in an interval of about 20
8 hours with a solution of :
Parts
Benzyl cellulose__..__: __________________ __‘_ 8
Benzene ________________________________ __‘30
Parts
Toluene _________________________________ __ 20
Concentrated rubber latex of 60% strength_ 160
Colloidal sulfur containing 15% of water__ 48
Xylene __________________________________ __ 25
Butylacetate ___________ __' ________________ __
10
Zinc oxide ______________________________ __
30
Butylalcohol _____________________________ __
4
30 Tetramethyl thiuram disul?de___________ __
5
20
Ethylalcohol__
3
Ammoniacal solution of caseine__________ __
___
__
_
25
30
Titanium dioxide may be added as pigment.—
After the water has been evaporated the rubber . The solvent is evaporated and vulcanization ‘is
surface is sprayed several times with a solution e?‘ected» as described in Example 1.
of chlorinated caoutchouc of the following com
35
Example 5
position:—
Parts
Chlorinated caoutchouc _________________ __
24
Chlorinated diphenyl having a chlorine con
I40
tent of about 55% ____________________ __ 3-6
Xylene
“
Toluene
__
~
33
___
26
After the solvents have been evaporated the con
Zinc oxide;
Tetramethyl thiuram disul?de___________ __
Ammoniacal solution of caseine __________ __
Example 3
A wooden container is coated with a double
sheet of soft rubber of 4 mm. thickness, which
‘has been prepared on the calender. The soft rub
Zinc oxide
'
'
>
1
'
- Parts
Resin obtainable according to the process
described in Example 2 of U. S. Patent
No. 1,863,881 ____________ __‘_‘ _________ __
and, if- desired,
__
5
20
.
20
~
’
Turpentine oil and the necessary amount
5
-
.
Standoil...
1.’!
spar _
30
surface is brushed with a solution of:'-
100
4
-
40
Inactive soot
5
Aldol-alpha-naphthylamine ____________ __
1.5
Ozokerite
Piperidyl-dithiocarbamic acid piperidine__
1.2
0.5
Benzothiazyl-disul?de___;l-_ ________ __-___
0.1
60
_
20
55
Iron oxide red
40-50
The solvent is evaporated and vulcanization is
effected as described in Example 2.
Example 6
60
A wooden container is coated‘ with a double
sheet of soft rubber of 4 mm; thlcknesshwhich _ I
has been prepared on the calender.
The soft
The surface of‘ the‘ soft rubber layer is coated
rubber mixture has the followingcompositionie
several times with a solutionof chlorinated
Parts
.caoutchouc, having the following composition:
Smoked sheets
Parts
Chlorinated caoutchouc __________________ __ 24
70 Chlorinated diphenyl, having a chlorine con.
tent of about 55% _______ _'__ ____________ __
5
65
100
Zinc oxide ___________ _; ____________ __'___
Sulfur_»____
5
,
1.7 .
Heavy span
40
Inactive soot
‘
_
Aldol-alpha-naphthylamine ____________ -_ i
Toluene ____________ __‘_..l ________________ __ 20
Ozokerite_
__
'
m
5.
Xvlene______..'_ _________ _..'________________ __ p 50
After the solvent has been evaporated the’ con
40
After the water has been. evaporated the rubber 45
of a dryer
Sulfur
Heavy
'
' Parts
55 Smoked sheets
65
Parts
Concentrated rubber latex of 60% strength_ 160
Colloidal sulfur containing 15% of water--- 48
tainer is ?lled with an aqueous solution of sodium
ber mixture has the following~compositlonz~
60
able rubber by spraying thereon several times
a mixture of :—
chloride of 10% strength and the solution is
45
heated to boiling by means of a steam coil. The
vulcanization is completed after about 24 hours.
50
35
A container is coated with a layer of vulcaniz
_I_'_
Piperidyl-dithiocarbamic acid piperidine__
Benzothiazyl-disul?de_________________ __
1.5
l
1.2
0.5.
0.1
75
3
2,108,715
The surface of the
rubber‘ layer thus'prei
pared is coated twice in‘ an interval of about 10
hours with‘aimixture containingz'
Parts
Isomerized
caoutchouc ________ __‘ ______ __
9-10
Xylene _______________ __.___' ___________ -_ 91-90
water-impermeable, ?lm-forming material ca
pable of preventing dissolution and decomposi
tion of ingredients in the interposed rubber coat
ing when being in contact with hot water, and
e?ecting vulcanization of the interposed rubber 5
mixture by contacting the layer of the ?lm-form
ing material with hot water.
and, if desired,v
~
.
_
.
Carbon black________________________ -;_
3-4
The solvent is evaporated and vulcanization is
10 effected as described in the foregoing examples.
Iclaim—'
»
~
,
I
=
1. The coating of the inner surface of hol
lows, such as tubes‘ or vessels, with a layer of
'- vulcanized rubber by ?rst applying thereon a
15 vulcanizable rubber mixture, providing the sur
face thereof with a layer of a strongly adherent
'
- '
2. The process according to claim 1, wherein
‘the ?lm-forming material contains chlorinated
caoutchouc.
-
‘
'
r
3. Theprocess according to claim 1, wherein
the ?lm-forming material contains a cellulose
' ether.
4. A process according to claim 1, wherein the
film-forming’ material contains an oil-lacquer.
ALBERT xocn.
15
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