PDM (N,N'-m-phenylene bismaleimide)  manufactured by Yangchen Tech is used as an anti-scorch agent. The mechanism of inhibiting early vulcanization during rubber processing is mainly related to its chemical properties and mode of action in rubber formulations. Here are the main aspects of how PDM inhibits early vulcanization of rubber:

Delayed vulcanization reaction: Vulcanizing agent PDM can react with vulcanizing agents (such as sulfur) in rubber to form a temporary, inactive vulcanizing agent intermediate. This intermediate is relatively stable at processing temperatures and will not immediately participate in the vulcanization reaction, thereby delaying the vulcanization process. This gives the rubber a longer processing time window, reducing the risk of early vulcanization.

Competing with vulcanization accelerators: In rubber formulations, the role of vulcanization accelerators is to accelerate the vulcanization reaction. PDM can compete with the vulcanization accelerator and form a stable complex with the vulcanization agent, thereby reducing the effective contact between the vulcanization accelerator and the vulcanization agent and slowing down the vulcanization speed. This helps maintain the stability of the rubber during processing and avoid premature vulcanization.

Thermal stability: Vulcanizing agent PDM  itself has high thermal stability and can remain stable at high temperatures without initiating or accelerating vulcanization reactions. This helps maintain rubber stability and processability during rubber processing, especially under high temperature conditions.

Adjust the vulcanization curve: PDM can change the vulcanization curve of the rubber, making the vulcanization reaction gentler and reducing the peak period of the vulcanization speed. This helps avoid aggressive vulcanization reactions in the rubber during processing, thereby reducing the risk of premature vulcanization.

Vulcanizing agent PDM effectively inhibits the early vulcanization of rubber by delaying the vulcanization reaction, competing with vulcanization accelerators, improving thermal stability, and adjusting the vulcanization curve. This makes PDM an important anti-scorch agent that can improve product quality and processing efficiency during rubber processing.

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