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Adding accelerator to rubber can promote the reaction between rubber and vulcanizing agent, improve the speed of vulcanization, reduce the vulcanization temperature, shorten the vulcanization time, reduce the amount of vulcanizing agent, while the physical and mechanical properties of vulcanized rubber chemical properties are also improved.
A. Different rubber adopts different vulcanization systems and different types of accelerators.
B. The accelerator has a decisive influence on the scorch performance, and the correct choice of accelerator will help the rubber mixing, extending, pressing out and operation safety. Generally, molded vulcanization requires a certain amount of scorching time, while moldless vulcanization does not require excessive scorching time.
C, the anti-scorch performance of the accelerator and its critical temperature, more than the critical temperature of the accelerator rapid activation, a variety of accelerators used in conjunction with some of the accelerator will be inhibited, some accelerators in the critical temperature will also appear larger activity.
D, the matching of accelerators should make the rubber has a wide range of vulcanization flatness. Rubber is a poor conductor of heat, the surface of the rubber inside the heat situation is not the same, a wide range of vulcanization flatness is to avoid over-sulfur, and make the product parts of the vulcanization of the guarantee of uniformity.
E, a reasonable combination of accelerators can also improve the aging properties of vulcanized rubber, has a certain role in plasticizing, can improve the processing properties of rubber. Disadvantages: poor dispersion of accelerator, pollution, the current use of accelerator is generally non-toxic.
