| 2,2'-DIBENZOTHIAZYL DISULFIDE | ||
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PRODUCT IDENTIFICATION |
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| CAS NO. | 120-78-5; 109767-80-8; 137497-18-8 |
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| EINECS NO. | 204-424-9 | |
| FORMULA | C14H8N2S4 | |
| MOL WT. | 332.47 | |
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H.S. CODE |
2934.20.1000 | |
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TOXICITY |
Oral rat LD50: >12 gm/kg | |
| SYNONYMS | 2,2'-Benzothiazyl Ddisulfide; MBTS; Dithiobis(benzothiazole); | |
| Mercaptobenzothiazolyl Ether; Naugex MBT; Benzothiazole Disulfide; Benzothiazolyl Disulfide; 2-Benzothiazolyl Disulfide; Bis(benzothiazolyl) Disulfide; Bis(2-benzothiazyl) Disulfide; Dibenzothiazyl Disulfide; 2-Mercaptobenzothiazole Disulfide; 2-Mercaptobenzothiazyl Disulfide; Benzothiazol-2-yl Disulfide; 2,2'-Dibenzothiazyl Disulfide; 2,2'-Dithiobis(benzothiazole); Vulcafor MBTS; Vulkacit DM; | ||
| SMILES | c12c(sc(n1)SSc1nc3ccccc3s1)cccc2 | |
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CLASSIFICATION |
Vulcanizing accelerant, EPA Pesticide Chemical Code 009202, UNII-6OK753033Z, Thiazole |
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PHYSICAL AND CHEMICAL PROPERTIES |
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| PHYSICAL STATE |
White to light yellow powder | |
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MELTING POINT |
177 - 180 C | |
| BOILING POINT | 260 C | |
| SPECIFIC GRAVITY | 1.5 | |
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SOLUBILITY IN WATER |
Insoluble (10 mg/l at 25 C) | |
SOLVENT SOLUBILITY |
Slightly soluble in Ethanol, Acetone | |
| pH | ||
| VAPOR DENSITY | ||
| log Pow | 4.66 (Octanol-water) | |
| VAPOR PRESSURE | 2.54E-10 (mmHg at 25 C) | |
| HENRY'S LAW | 2.34E-13 (atm-m3/mole at 25 C) | |
| OH RATE | 3.15E-10 (cm3/molecule-sec at 25 C Atmospheric ) | |
| AUTOIGNITION |
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REFRACTIVE INDEX |
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| NFPA RATINGS |
Health: 1, Flammability: 1, Reactivity: 0 | |
| FLASH POINT |
271 C | |
| STABILITY | Stable under ordinary conditions | |
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GENERAL DESCRIPTION & EXTERNAL LINKS |
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A medium fast curing primary accelerator in the rubber industry; retarder in neoprene; Wikipedia Linking: http://en.wikipedia.org/wiki/Vulcanizing_Accelerators http://siri.org/msds/mf/cards/file/0505.html http://molecules.gnu-darwin.org/mod/dithio-more.html http://www.wbcsd.org/web/projects/tire/SoKreportfinal.pdf http://scholar.lib.vt.edu/ |
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| SALES SPECIFICATION | ||
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APPEARANCE |
White to light yellow powder | |
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MELTING POINT |
165 C (Initial), 171 -179 C (Final) | |
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SIEVE ANALYSIS |
0.5% max (+ 63 µm), 0.1% max (+ 150 µm) | |
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HEAT LOSS |
0.5% max | |
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OIL CONTENT |
2.0% max (According to Buyer's request) | |
|
ASH |
0.5% max | |
| TRANSPORTATION | ||
| PACKING | III | |
| HAZARD CLASS | 9 | |
| UN NO. | 3077 | |
| SAFETY INFORMATION | ||
Hazard Symbols: XI N, Risk Phrases: 31-43-50/53, Safety Phrases: 36/37-60-61 |
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| GENERAL DESCRIPTION OF ACCELERATOR | ||
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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;
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PRICE INFORMATION |
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