Accelerator 2,2 -dibenzothiazyl disulfide

DISULFIDE DI-2-BENZOTHIAZOLYLDISULFIDE DIBENZOTHIAZYL DISULFIDE 2,2 -DIBENZO-THIAZYLDISULFIDE DIBENZOYL-THIAZYL DISULFIDE DIBENZTHIAZYL DISULFIDE 2,2 -DITHIOBIS(BENZOTHIAZOLE) DWUSIARCZEK DWUBENZOTIAZYLU (POUSH) MBTS MBTS RUBBER ACCELERATOR 2-MERCAPTOBENZO-THIAZOLEDISULFIDE 2-MERCAPTOBENZO-THIAZYLDISULHDE ROYAL MBTS THIOFIDE USAF B-33 USAF CY-5 USAF EK-5432 VULKACIT DM VULKACIT DM/MGC... 

Other important vulcanization accelerators based on 2-mercaptobenzothiazole are dibenzothiazyl disulfide (MBTS), obtained by the oxidation from MBT (e.g. with chlorine), and 2-morpholinobenzothiazylsulfenamide (MBS), (which more accurately should be referred to as N-(oxydiethylene)-2-benzothiazylsulfenamide). 

Thiazoles are derivatives of benzothiazole compounded with sulfenamides. The benzothiazoles include 2-MBT, dibenzothiazyl disulfide (MBTS) and the zinc salt of 2-mercaptobenzothiazole (ZMBT). The sulfenamides are principally N-tert-butyl-2-benzothiazyl sulfenamide (TBBS), N-cyclohexyl-2-benzothiazyl sul-fenamide (CBS) and morpholinylmercaptobenzo-thiazole (MOR). MBT, MBTS and CBS are the more widely used. Because of their strong capacity to sensitize, thiazoles are less frequently used in gloves than are the thiurams. Nonetheless, they are widely used in the rubber industry, as well as others (Table 7). Indeed, MBT remains the most widely used accelerator for industrial rubber (Feinman 1987). Nonetheless, sensiti-... 

Dibenzothiazyl disulfide is a rubber chemical used as a vulcanization accelerant. The most frequent occupational categories are metal industry, homemakers, health services and laboratories, and building industries. 

For halobutyl rubbers, zinc oxide is used as the vulcanizing agent with low levels of sulfur stearic acid and sulfenamide accelerators. Bromobutyl rubber shows higher cure reactivity than chlorobutyl rubber. Both CIIR and BUR will cure with zinc oxide, but only BUR will cure with sulfur alone, no zinc oxide or accelerator being necessary. Bromobutyl rubber can be cured with 0.5 phr of sulfur and 1.3 phr of dibenzothiazyl disulfide accelerator, 3 phr of zinc oxide and 1 phr of stearic acid. Levels of sulfur as low as 0.5 phr will give a rapid and reasonable degree of cure. Zinc diethyl dithiocarbomate (ZDC) accelerator can be used in small quantities (0.25-0.75 phr) with zinc oxide for heat resistant products, and to improve compression set. 

Generally, an EPDM cure system will contain a thiazole (mercaptobenzothiazole or MBT, dibenzothiazyl disulfide or MBTS etc.) in combination with a thiuram and/or a dithiocarbo-mate. For higher heat resistance, the sulfur donor accelerators may replace part or all of the elemental sulfur in the cure paekage, as exemplified below ... 

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