1)N-cyclohexyl-2-benzothiazole sulfenamide The trade name is the accelerator CZ. This product is light yellow powder, slightly odorous, non-toxic, specific gravity 1.31~1.34, melting point not lower than 94 °C, stable storage. The critical temperature of vulcanization is 138 ° C, which has the advantages of excellent anti-scorch performance and fast vulcanization speed. This product has a slight discoloration, is a cream, and has excellent aging resistance. The general dosage is 0.5~2 parts.
(2) N-oxydiethyl-2-benzothiazole sulfenamide or 2-(4-morpholinylthio)benzothiazole The trade name is the promoter NOBS. This product is light yellow powder and non-toxic. The specific gravity is 1.34~1.40. The melting point is 80 ° C ~ 86 ° C. It will gradually decompose when exposed to heat, so it should be stored at low temperature. When the storage time is more than 6 months, the scorching of the rubber material increases, the critical temperature of vulcanization is above 138 ° C, the scorch time is longer than the accelerator CZ, and the operation is safer. This product is easy to disperse in the rubber compound, does not spray frost, and has slight discoloration. The general dosage range is from 0.5 to 2.5 parts with 2 to 0.5 parts of sulfur. (3) N-tert-Butylbenzothiazole sulfenamide The trade name is the promoter NS. This product is a light yellow powder with a special odor. The specific gravity is 1.29, and the melting point is not lower than 105 °C. Its performance and usage are basically similar to the accelerator CZ, but it is more delayed in natural rubber. This product is discolored and slightly polluted. (4) N,N-Dicyclohexyl-2-2benzothiazole sulfenamide The trade name is the accelerator DZ. This product is brownish yellow powder, odorless. The specific gravity is 1.2. The melting point is not lower than 90 °C. Stable storage. This product has good dispersibility in rubber. The vulcanization flatness is similar to the accelerator CZ. The vulcanized rubber has better dynamic physical and mechanical properties, and has high elasticity and high tensile strength. However, because of its bitter taste, vulcanizates cannot be used to make products that come into contact with food. The amount is generally in the range of 0.5 to 1 part and the sulfur content is 2.5 parts.
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