| CAS
NO. |
155-04-4 |
|
| EINECS
NO. |
|
| FORMULA |
C14H8N2S4Zn |
| MOL
WT. |
397.86 |
| H.S.
CODE |
2934.20 |
| TOXICITY |
|
| SYNONYMS |
ZMBT;
Bantex; Zinc Salt of 2-Mercaptobenzothiazole
|
| Zetax; 2(3H)-Benzothiazolethione, zinc salt;
Benzothiazolethiol, zinc salt;
ZNMB; Zinc Bis(mercaptobenzothiazole);
Benzothiazolethione, zinc salt;
Zinc
2-mercaptobenzothiazolate; Zinc benzothiazolethiolate; Zinc
benzothiazolylmercaptide; Zinc Bis(mercaptobenzothiazole); Zinc
mercaptobenzothiazole; |
| RAW
MATERIALS |
|
| CLASSIFICATION
|
RUBBER ACCELERATORS |
|
PHYSICAL AND CHEMICAL PROPERTIES
|
| PHYSICAL
STATE |
Off-white
to pale yellow powder
|
| MELTING POINT |
300
C |
| BOILING
POINT |
|
| SPECIFIC GRAVITY |
1.7
|
| SOLUBILITY
IN WATER |
Insoluble
(Soluble in NaOH) |
| AUTOIGNITION |
|
| pH |
|
| VAPOR DENSITY |
|
| NFPA RATINGS |
Health:
1, Flammability: 1, Reactivity: 0
|
| FLASH
POINT |
|
| STABILITY |
Stable
under ordinary conditions
|
|
APPLICATIONS
|
|
It's
main application is in sulfur cured latex
as a secondary accelerator in combination
with Zinc
Diethyldithiocarbamate or Zinc
Dimethyldithiocarbamate. Higher moduli in
latex films are obtained than Dithiocarbamates
alone and a better compression set
resistance in latex foam can be achieved
without increasing the cure time. It is
used also as an fast accelerator in dry
rubber applications (almost similar to 2-Mercaptobenzothiazole,
but with a slight scorch improvement).
|
| SALES
SPECIFICATION |
|
APPEARANCE
|
Off-white
to pale yellow powder
|
|
CONTENT
|
82 - 85% |
| ZINC
CONTENT |
15
- 18% |
|
FREE
MBT
|
14
- 18%
|
| PARTICLE
SIZE |
0.1%
max (+ 150 µm)
|
|
LOSS
ON DRYING
|
0.5%
max
|
| OIL
CONTENT |
2.0%
max
|
| TRANSPORTATION |
| PACKING |
20kgs
in Bag |
| HAZARD CLASS |
|
| UN
NO. |
|
GENERAL
DESCRIPTION OF ACCELERATOR |
|
Sulfur combines with nearly all elements. Sulfur forms ring and chain structures
as it is the second only to carbon in exhibiting catenation. The 8-membered ring and
shorter chain structure of sulfur molecule is important in vulcanization
process which individual polymers are linked to other polymer molecules by
atomic bridges. This process produces thermoset materials which are cross-linked
and irreversible substances. The term thermoplastic is for high molecular weight
polymers which can undergo melting-freezing cycle. Thermosets are not melted and
re-molded on heating after cured. The split of sulfur 8-membered ring structure into shorter chains provides rubber vulcanization process. The split are
liked with cure sites (some of the solid bonds in the molecule) on rubber
molecules, resulting in forming sulfur bridges typically between 2 and 10 atoms
long. Vulcanization makes rubber harder, more durable and more resistant to
heating, aging and chemical attacks. The number of sulfur atoms in the sulfur bridges varies physical properties of
the end products. Short bridges containing one or two sulfur atoms offer heat
resistance and long bridges offer flexible property. Vulcanization can also be accomplished with
certain peroxides, gamma radiation, and several other organic compounds. The
principal classes of peroxide cross-linking agents are dialkyl and diaralkyl
peroxides, peroxyketals and peroxyesters. Other vulcanizing agents include amine
compounds for the cross-linking of fluorocarbon rubbers, metal oxides for
chlorine-containing rubbers (notably zinc oxide for chloroprene rubber) and
phenol-formaldehyde resins for the production of heat-resistant butyl rubber
vulcanizates. Accelerator, in the rubber industry, is added with a curing agent
to speed the vulcanization. Accelerators contain sulfur and nitrogen like derivatives of benzothiazole and thiocarbanilides.
The popular accelerators are
sulfenamides (as a delayed-action accelerators), thiazoles, thiuram sulfides,
dithocarbamates and guanidines.
There are some types of rubber accelerators. They are used in combination with each other in
accordance with vulcanizing and/or acid-base conditions. Some examples
classified by chemical structure are as below;
- Thiazole
- 2-Mercaptobenzothiazole (CAS #:
149-30-4)
- Dibenzothiazole disulfide (CAS #:
120-78-5)
- 2-Mercaptobenzothiazole Zinc salt (CAS #:
155-04-4)
- Sulphenamide
- N-Cyclohexyl-2-benzothiazole sulfenamide (CAS #:
95-33-0)
- N-Oxydienthylene-2-benzothiazole sulfenamide (CAS #:
102-77-2)
- N-tert-butyl-2-benzothiazyl sulfenamide (CAS #:
95-31-8)
- Guanidine
- Diphenyl
guanidine (CAS #: 102-06-7)
- Di-o-tolylguanidine (CAS #: 97-39-2)
- Thiuram
- Tetramethyl
thiuram disulfide (CAS #: 137-26-8)
- Tetraethyl
thiuram disulfide (CAS #: 97-77-8)
- Tetramethyl
thiuram monosulfide (CAS #: 97-74-5)
- Isobutyl
thiuram disulfide (CAS #: 3064-73-1)
- Tetrabenzylthiuram disulfide (CAS #:
10591-85-2)
- Dipentamethylene thiuramtetrasulfide (CAS #:
120-54-7)
- Dithiocarbamate
- Zinc
dimethyl dithiocarbamate (CAS #: 137-30-4)
- Zinc diethyl
dithiocarbamate (CAS #: 14324-55-1)
- Zinc dibutyl
dithiocarbamate (CAS #: 136-23-2)
- Zinc
N-ethyl-dithiocarbamate (CAS #: 14634-93-6)
- Zinc
dibenzyl dithiocarbamate (CAS #: 14726-36-4)
- Copper
dimethyl dithiocarbamate (CAS #: 137-29-1)
- Thiourea
- Ethylene
thiourea (CAS #: 96-45-7)
- N,N'-Diethylthiourea (CAS #: 105-55-5)
- N-N'-Diphenylthiourea (CAS #:
102-08-9)
|