• Categories:Industry news
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• Time of issue:2021-01-05 13:17
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(Summary description) The addition of accelerator can promote the reaction between rubber and curing agent, improve the curing speed, reduce the curing temperature, shorten the curing time, reduce the amount of curing agent, and improve the physical and mechanical properties and chemical properties of vulcanizate. A. Different rubber uses different curing system and accelerator types. B. Accelerator plays a decisive role in scorch performance. The correct choice of accelerator is helpful to the mixing, calendering, extrusion and operation safety of rubber compound. Generally, molding vulcanization needs a certain scorch time, while no molding sulfur does not need a long scorch time. C. The scorch resistance of the accelerant is related to its critical temperature. The accelerant can be activated rapidly when it is over the critical temperature. When a variety of accelerants are used together, some accelerants will be inhibited, and some accelerants will have greater activity at the critical temperature. D. The vulcanizate should have a wide range of accelerators. Rubber is a poor heat conductor. The internal heating condition of rubber surface is different. The wide vulcanization flatness is the guarantee to avoid excessive sulfur and make all parts of the product vulcanized evenly. E. The reasonable combination of accelerators can also improve the aging properties of vulcanizates, have a certain plasticizing effect, and improve the processability of compounds. The disadvantages are poor dispersion and pollution of accelerators, and currently used accelerators are generally nontoxic.