Historical development of rubber accelerator

With the compound, to shorten the curing time, lower the curing temperature, reduce the amount of sulfur and improve vulcanizate properties of substances known as vulcanization accelerator (referred to as accelerator). 

 

In 1839 Goodyear discovered the white lead (alkaline calcium carbonate) and sulfur used for raw rubber  can shorten the curing time. Later they found to lead oxide, calcium oxide, magnesium oxide, zinc oxide, a series of alkali metal oxide can promote the efficiency of all sulfide, especially by the lamps at universal attention, thus creating the era of using inorganic accelerator in the rubber industry. 

In 1906, German chemist Aoun Slager found aniline can accelerate the curing , and than rubber accelerant started the excessive organic compounds from inorganic compounds to a significant evolution, but later because of the aniline is toxic. In 1907 Albright-diphenyl-thiourea and its derivatives instead of aniline.

Historical development of rubber accelerator as follow: 

At the same time, between 1906 and 1909 people found the containing Hexahydropyridine synthetic rubber vulcanization, the combination of sulfur than no more than eight times Hexahydropyridine, improve the aging resistance of vulcanizates. Further studies showed that the aliphatic, alicyclic and heterocyclic amines, aliphatic amines and aromatic amines with carbon disulfide reactant, the condensation of aliphatic aldehydes with ammonia and so can be used as the vulcanization accelerator. 

1921 Ke Lainuo certainly the activation of zinc oxide on the majority of organic accelerator, organic accelerator more considerable progress, which has shaken the inorganic accelerator in the rubber industry's position and make it downgraded the activity of the auxiliary agent. 

1921 Bedford and Bruni were found in 2 - sparse benzene and thiazole and its homologues, the performance of their disulfide and metal salts as the accelerator is extremely valuable, curing the safe operation of the vulcanizate properties; thiazole accelerator found in rubber industry has important historical significance, as vulcanization accelerator development milestone. 

Bayer 2 - the sparse benzothiazolyl ammonium oxidation was prepared sulfenamide accelerator in 1931, its vulcanization start late, but the curing speed, known as delayed-action high-speed accelerator, welcomed by the rubber processing industry , since the advent of rapid development, known as the present one of the p roduction-consumption category. 

In recent years, with the rapid development of the synthetic rubber industry, the national rubber accelerant production have a larger growth, to promote the growth and decline of view of the agent from a variety of rubber production consumption is thiazole and sulfenamide amides, both the total output accounts for about 70 to 75 percent of the promoting agent production, which is the fastest growing sub-sulfonamide accelerator.