close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2404585

код для вставки
Patented‘ July 23, 1946 j ,
.v.
. . . .
'
"
2,404,585
f UNITED; fsT'ArEs
' 1,. Ernst, ‘Schmidt, Akron, Ohio, assignor to The Fire
'
‘ stone‘ Tire &, Rubber Company, Akron, Ohio, a
corporation of Ohio,
‘ ' N6 Drawing." Application August- 11, 1045;]
1 ’
Serial No. 610,398
(Cl. 260-776)
3 Claims.
1
2
This invention relates to latex compounding.
More particularly, it relates to the use of red lead
oxide. The accelerator used with the black was
tetraethanol ammonium Captax solution (24.4 per
cent Captax). The black was a reinforcing black
oxide instead of zinc oxide as an activator for
vulcanization of latex accelerated by a benzo
thiazyl compound.
‘ added as a 40 per cent dispersion. The l-atex'was
60 per cent solids.
.
The amounts are parts by
weight.
The term “benzothiazyl” is used herein to de
A
Latex, 60% ____________________________ _-
B
O
167
167
5
5
Black, 40% _ _ . _ . _ . .
D
167
E
167
F
167
167
_ _ . _ . . --
Zinc oxide, 50% _______________________ _-
G
B.
167
167
93. 95
93. 95
5
5 ______ -_
04, 507
Sulfur, 50% ____________________________ __
4
4
4
l3. 7
4
l3. 7
4
l3. 7 ______ _4
4
Ammonium Captax (27.5% Captax)-.__
2. 73
3. 64
4. 55
_
2.73
3. 64 >
4. 55
T. E. A. Oaptax (24.5% Oaptax)
_ . ._ . . . .
_ . . . . . -_
3.07
13. 7
4
3. 07
The zinc-oxide-containing compound was ?uid
and stable for only about 10 minutes, and the
test slabs, therefore, had to be cast in a hurry.
The lead-oxide-containing compound was thin
scribe the so-called Captax-type of accelerator,
Captax being the trade-name for mercaptobenzo
thiazole. Derivatives which coagulate latex are
not suitable for use in this invention, but com
pounds which are suitable include the sodium, 20 and so stable it could be stored for days with
very little change in stability. The activator was
amomnium, etc., salts, benzothiazyl disul?de, cy
dispersed by ball-milling with 4 per cent of Dar
van (a dispersing agent) before adding to the
latex. The particles of lead oxide and zinc oxide
clohexyl benzothiazyl sulfenamide, etc.
It has been realized that zinc oxide is not al
together satisfactory for compounding with latex
because it renders the latex unstable. The zinc
in dispersed form were about the same size.
Pure gum compounds containing red lead oxide
are an intense orange color which turns to black
oxide cannot be omitted from latex without re
placing it with some activator. According to this
‘
invention it is replaced entirely or largely by red
on curing,
Test slabs were obtained by drying the latex on
30 glass plates. All slabs were dried one week at
In compounding latex with red lead for corn
room temperature in the open and then one week
parison with latex compounded with zinc oxide,
in the dessicator. Below are recorded the results
lead oxide (Pb304).
_
it has been assumed that the activation is ‘due
to the metal, and equivalent proportions of the
of tests on the physical properties of samples
press-cured at 275° F. for 20, 40, 60, and 80 min
35 utes, respectively, as indicated. The amount of
two metals are used in the following formulae. ‘
accelerator'?gured as Captax is given to make
‘ The comparison recorded below was made with
the table most informative.
5 parts of zinc oxide and 13.7 parts of ‘red lead
Formula
A
B
Gupta-x
o
D
400% mdum": ----------- --
600% modulus
a. """"""" "
'
Tensile
11
Black compounds
‘Red lead oxide
1.25% 0.75%
1.0%
ZnO
1.25% 0.75%
PbgO;
075%
1.0%
350
73
730
3s
730
73
700
73
750
3s
770
73
720
500
30
750
770
725
750
755
720
530
570
~3350
3385
ii?
150
iig
125
53
100
i2?
130
183
100
‘3°
4 5
500
35°
420
405
80
0.75%
5
025
80
150
150
100
150
100
580
475
350
250
32
330
300
22a
250
3
275
30
200
11370
73°50
1; 200
80
250
300
325
300
300 4
230
1,440
1,400
3
60
1:060
13:
1:120
1020
'970
.3
1:425
1,32
1:375
1:200 "5356'
56°
80
1, 030
025
1, 100
1, 500
1, 410
1, 290
3, 515 ________ __
20
50
80
3, 050
2,790
3,250
2,940
3, 350
3,135
580
2,915
3, 850
3,130
3,040
2,850
3, 550
4,000
4,100
3,880
4, 220
4,030
4,250
4,230
3, 725
3,525
3,730
3,500
3, 125
40
-------------
G
.
Zinc oxide
200% maul“ -------------- --
F
Pure gum compounds
Cure
3119mm” ----------------- --
E
,550
3,485
3,800
3:220
3,985
3,550
3,240
3, 470
1
2,404,586 ~
3
Vulcanized rubber depositedfrqmdatex, vul
lized. Fillers", etc.,may=rbe added. The» latex used.
need not be concentrated. Other compounding
canized in? the presence, of a benzothiazyl accel
erator, substantially free from zinc oxide and
ingredients than those speci?ed may be employed; - ' containing sui?cient red lead oxide to activate
Modi?cations are permissible within the scope» qt‘ 5; ‘ the accelerator.
‘
1
4
otherycompolmding; ingredients may- be uti-1
p
the appended claims.
,
‘
What I claim is:
V
1. Latex containing sulfur, a benzothiazyli'ac- I
celerator, substantially free‘ of zinc Qxideand con
3, The process of vulcanizing latex rubber
which,‘ comprises, Yul'canizing with sulfur and a
bcnzothiazyl accelerator in' the presence of red
lead oxide as ‘an’ activator. ,
taining red lead oxide in an amountsu?icierrttq i0. .
‘ERNST SCHMIDT.
activate the accelerator.
Документ
Категория
Без категории
Просмотров
0
Размер файла
179 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа