During storage and processing, the rubber compound will undergo premature vulcanization (cross-linking) due to the effect of heat and lose fluidity and the ability to be reprocessed. This is the scorch phenomenon. Scorch of rubber compounds is one of the common problems in the rubber processing process. Especially in the modern high-temperature, fast, and efficient processing technology and with the use of compounding agents that are prone to scorch (such as reinforcing resins, methylene white system adhesives, fine particle carbon black, etc.), the scorch problem is more likely to occur. Scorch can be solved by adjusting the vulcanization system, but be careful not to cause changes in the properties of the rubber compound; cooling can be used to improve the storage or processing conditions of the rubber compound, but complex equipment is required. It is now widely believed that the use of scorch retarder is the simplest and easiest way to prevent scorch. Therefore, scorch retarder has become an important operating aid for rubber processing safety.
