1. Origin of Rubber Accelerator
In 1881, Thomas Rowley discovered that ammonia can accelerate rubber vulcanization, but the patent for aniline as a vulcanization accelerator was obtained by WaOstwald in 1908.
As early as 1887, Hofmann successfully synthesized aminothiophenol by using benzene and organic acids, and named it as a mercapto compound (2-mercaptoaniline).
Bedford (Bedford) was studying how to solve the scorch of CA, and accidentally found that CA and the reaction product accelerator M, which is a sulfur product, are highly efficient accelerators. The patent of the accelerator MBT (M) as an accelerator was obtained by Bruni and Romani in Italy in 1920, and Sebrell and Bedford obtained the patent in the United States in 1925. The United States first realized industrial production. Since then, the United States, Britain, Japan and other countries have issued many patents and proposed various methods for synthesizing M, but most of them have not been industrialized due to low yields. There are only two types of industrial production: aniline method (also called high pressure method) and o-nitrochlorobenzene method (also called normal pressure method).
2. The development of thiazole accelerators
In the 1920s, mercaptobenzothiazole was applied as a promoter in Italy and the United States as patents, and thiazole accelerators have been developed since. Accelerator M belongs to the earliest thiazole accelerator products found. It is still used today and has a wide range of applications. So far, thiazole accelerators are still important general-purpose accelerators. They are used in many organic accelerators, and many rubber products are still used in the formulation of thiazole accelerators.
3. 14 kinds of Rubber Accelerator
(1) ZMBT, MZ (155-04-4)
Zinc2-mercaptobenzothiazole
(2) M, MBT (149-30-4)
2-mercaptobenzothiazole; 2-bezothiazolethiol
(3) SMBT (2492-26-4)
Sodium saltof2-mercaptobenzothiazole
(4) MBTS,DM (120-78-5)
dibenzothiazoledisulfde
(5) MDB (95-32-9)
2-(4′-Morpholinodithio)benzothiazole
(6) DBM,DNBT (4230-91-5)
Benzothiazole,2-[(2,4-dinitrophenyl)thio]
(7) BT (95-16-9)
Benzothiazole
(8) 64# (95-30-7)
N,N’-Diethylthiocarbamoyl-2-mercaptobenzothiazole
(9) 2-（2,6-Dimethyl-4-morpholinothio）ben-zothiazole
(10) MH (123-33-1)
Cyclohexylamine saltof2-mercaptobenzothiazole
(11) MK (170138-17-7)
Potassium saltof2-mercaptobenzothiazole
(12) MT (96-53-7)
2-Mercaptothiazoline
(13) MCu (22915-49-7)
Cupric saltof2-mercaptobenzothiazole
(14) MTT (1908-87-8)
3-methylthiazoline-2-thione