6 MOST POPULAR RUBBER ACCELERATORS

In the rubber manufacturing process, a vulcanization accelerator, also known as a promoter, is an organic substance that accelerates the vulcanization of rubber. Used in small quantities, has the ability to reduce heating time or temperature, reduce the use of vulcanizing agents and improve product quality. Some common chemicals used today are MBT, MBTS, CBS, DPG, TMTD, ZDEC, and ZMBT. 

1. MBT (Mercaptobenzothiazole)

- Other name: 2-mercaptobenzothiazole

                       2-benzothiazol-tiol 

- Formula: 

- Properties: Powder or porous granules, yellow granules, bitter taste, characteristic odor. Commercial products slightly differ in their properties.

- Effect: In the rubber industry MBT has 3 main effects

+ Accelerated vulcanization effect for natural rubber, neoprene, and latex since the temperature is 120°C.

+ Strong activating effect for Baz accelerators, such as guanidine group DPG, to become an extremely fast curing accelerator mixture. 

+ Soft plasticizing effect of natural rubber according to the chemical process.

2. MBTS (Disulfur Benzothiazyl)

- Other names: 2-Benzothiazolyl disulfide,

                         Disulfur de benzothiazyl, 

                         Dibenzothiazyl disulfide,

                         2,2'-dithio-bis-benzothiazole.

- Formula: - Properties: White to off-white (yellowish-white) porous powder or granules, odorless, non-toxic. Density d=1.5. The average T°nc is 170°C. Soluble in benzene, chloroform, acetone, and ether. Insoluble in water and gasoline. 

- Effects: In the rubber industry, MBTS has the following 5 main effects

+ Fast accelerated vulcanization for natural and synthetic rubber mixtures at 140°C. Below this temperature (120°C) there is a moderate acceleration effect, but very good safety in use for tempered and shaped mixtures, i.e. difficult to vulcanize earlier than MBT.

+ Activated or activated by guanidine, thiuram, dithiocarbamate, and aldehyde-amine accelerators. 

+ Auxiliary for butyl rubber vulcanization with quinone dioxime or quinone dioxime dibenzoate. 

+ Plasticizing natural rubber according to the chemical process, but less effective than MBT. 

3. CBS

- Chemical name: 2-benzothiazole sulfonamide

- Formula: C13H16N2S2 

- Properties: Gray-white powder, min melting point 98.0^oC

+ As a promoter with a long initial flow time, high self-containment resistance, but short curing time, wide vulcanizing plate. + As a promoter with long initial flow time, high self-containment resistance, but short curing time, wide vulcanizing plate.

+ Limiting the problem of discoloration, misting after vulcanization, acting as an anti-aging agent in the vulcanization process.

- Effect: 

+ Used as a secondary promoter with ZnO vulcanizing aid, stearic acid to enhance the vulcanization effect of TMTD, TMTM, ZDMC, DPG, MBT, MBTS, etc.

CBS is used as a promoter for low-sulfur vulcanization systems when combined with thiuram and dithiocarbamate family promoters, prolonging the mixed flow time of this vulcanization system.

4. DPG

- Properties: 

Fine white powder. T°nc 145°C, d = 1.13 a - 1,19. Odorless, soluble in benzene, toluene, chloroform, acetone, alcohol, and ether. Slightly soluble in water, insoluble in ether - gasoline. Has a slightly bitter taste. 

- Application: In the rubber industry DPG has 4 uses: 

+ Promotes medium vulcanization, basicity, guanidine group, at an operating temperature above 140°C for natural rubber and synthetic rubber. 

+ Strong activator or adjuvant for thiazole, thiazoline, or thiuram group promoters; especially the thiazole acid group, the combination becomes a mixture with a semi-fast acceleration rate for vulcanization of natural rubber and butadiene-styrene synthetic rubber. At that time, the phenomenon of "dead on the machine" of the rubber mixture is easy to occur. With current conditions, it is possible to combine DPG with disulfur benzothiazole (accelerator DM) more safely. 

+ Plasticizer is very effective for chlorobutadiene synthetic rubber, but it also has the effect of slow vulcanization and like most organic bases, DPG has the effect of plasticizing poly sulfur alkenes such as Thiokol A, Thiokol AZ. To maintain this plasticizing effect despite the presence of fillers such as carbon smoke or zinc oxide, disulfur thiuram is added. 

+ Absorbs the heat of latex solidification, that is, helps the latex to solidify when absorbing hot heat. 

5. ZDEC

- Properties: White powder (granules). Density a1.41. Soluble in 1% sodium hydroxide, carbon disulfide, Benzene, Chloroform, slightly soluble in alcohol, insoluble in gasoline

- Other names: Ethyl zimate

- Application: Mainly used in the production of medical products, bandages, and self-healing products. It is 0.5-1 part in dry rubber.

6. ZMBT

- Chemical name: Zinc-2-Mercaptobenzothiazole

Properties: 

+ White powder

+ Melting point ℃: 200

+ Zinc content: 15-18%

+ Free MBT content: 14-18%

- Application: Accelerator for natural rubber, latex, and neoprene

- To find stable quality products, and reasonable prices, please contact us. Currently, Mega Vietnam is supplying and widely deploying accelerators in the domestic market for rubber production, thereby confidently meeting all the needs of customers. 

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