Adding accelerators to rubber can promote the reaction between rubber and vulcanizer, increase the vulcanization speed, reduce the vulcanization temperature, shorten the vulcanization time, reduce the amount of vulcanizer, and at the same time improve the physical, mechanical and chemical properties of the vulcanized rubber.
A. Different rubbers use different vulcanization systems and different accelerator types.
B. Accelerators have a decisive influence on scorch performance. The correct selection of accelerators helps the mixing, calendering, extrusion and operation safety of rubber. Generally, molded vulcanization requires a certain scorch time, while moldless vulcanization does not require too long scorch time.
C. The scorch resistance of the accelerator is related to its critical temperature. When the critical temperature is exceeded, the accelerator is rapidly activated. When multiple accelerators are used in combination, some accelerators will be inhibited, and some accelerators will also show greater activity at the critical temperature.
D. The combination of accelerators should make the rubber have a wide vulcanization flatness.
Rubber is a poor conductor of heat, and the surface and interior of the rubber are not heated uniformly. A wide vulcanization flatness is the guarantee to avoid over-vulcanization and ensure uniform vulcanization of all parts of the product.
E. Reasonable matching of accelerators can also improve the aging properties of vulcanized rubber, have a certain plasticizing effect, and improve the processing properties of the rubber. Disadvantages: poor dispersibility and pollution of accelerators. The accelerators currently used are generally non-toxic.