2,2'-DIBENZOTHIAZYL DISULFIDE

PRODUCT IDENTIFICATION

CAS NO. 120-78-5; 109767-80-8; 137497-18-8

2,2'-DITHIOBIS(BENZOTHIAZOLE)

EINECS NO. 204-424-9
FORMULA C14H8N2S4
MOL WT. 332.47

H.S. CODE

2934.20.1000

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

CLASSIFICATION

Vulcanizing accelerant, EPA Pesticide Chemical Code 009202, UNII-6OK753033Z, Thiazole

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

White to light yellow powder

MELTING POINT

177 - 180 C
BOILING POINT 260 C
SPECIFIC GRAVITY 1.5

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

 

REFRACTIVE INDEX

 

NFPA RATINGS

Health: 1, Flammability: 1, Reactivity: 0

FLASH POINT

271 C

STABILITY Stable under ordinary conditions

GENERAL DESCRIPTION & EXTERNAL LINKS

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
International Chemical Safety Cards

http://molecules.gnu-darwin.org/mod/dithio-more.html
dithio Molecules Structural Archive and Gallery

http://www.wbcsd.org/web/projects/tire/SoKreportfinal.pdf
List of Concerned Tire Materials

http://scholar.lib.vt.edu/
SYNTHESIS AND RING OPENING POLYMERIZATION OF MACROCYCLIC MONOMERS FOR PRODUCTION OF ENGINEERING THERMOPLASTICS

SALES SPECIFICATION

APPEARANCE

White to light yellow powder

MELTING POINT

165 C (Initial), 171 -179 C (Final)

SIEVE ANALYSIS

0.5% max (+ 63 µm), 0.1% max (+ 150 µm)

HEAT LOSS

0.5% max

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

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)

PRICE INFORMATION