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The so-called rubber burning phenomenon, in fact, is the rubber in the processing and parking process, the rubber premature crosslinking of the early vulcanisation phenomenon, therefore, the rubber burning performance for the length of the burning time, that is, the vulcanisation (crosslinking) starting point of the fast and slow.
The scorchability of the rubber is mainly determined by the formulation of the rubber, which is mainly affected by the promoter. If the rubber material used vulcanisation system of crosslinking induction period is short (burnt time is short), the rubber material in the process due to the processing temperature is higher, or stay longer, and in the process of processing partially or completely began to crosslinking, so that the rubber material partially or completely lose the processing process necessary plastic flow properties, so the phenomenon of burnt phenomenon.
The thermal history of the rubber in the operation process is also an important factor causing the scorching phenomenon. Rubber begins its thermal history when it is mixed with vulcanising agents, accelerators and other compounds. The thermal history is the full name of a process and refers to the cumulative amount of heat applied to the rubber mix up to a certain time. Mixing rubber in the mixing of parking, hot refining, calendering, pressing out, pulping, moulding and vulcanisation before the operation, are subjected to the role of heat, so that the thermal history is increasing, because of the rubber has the characteristics of heat accumulation, so the actual scorch time of the rubber material, including the operation of the scorch time and the residual scorch time of the two parts. Operation burnt time is the burnt time consumed during rubber processing due to the heat accumulation effect, which depends on the degree of processing, such as the number of times the rubber is turned over, the degree of hot refining and calendering, pressing out, etc.. Residual charring time is the time during which the rubber remains fluid when heated in the model. There is no fixed limit between the operating burn-in time and the residual burn-in time. It varies with the operation and storage of the binder. If a binder undergoes more operations, it takes up more burn-in time. The less scorch time remains, the closer the starting point of scorching (start of crosslinking) is. The compound loses the necessary fluidity during processing and in modelling and scorching occurs.
The scorchability of the rubber is mainly determined by the formulation of the rubber, which is mainly affected by the promoter. If the rubber material used vulcanisation system of crosslinking induction period is short (burnt time is short), the rubber material in the process due to the processing temperature is higher, or stay longer, and in the process of processing partially or completely began to crosslinking, so that the rubber material partially or completely lose the processing process necessary plastic flow properties, so the phenomenon of burnt phenomenon.
The thermal history of the rubber in the operation process is also an important factor causing the scorching phenomenon. Rubber begins its thermal history when it is mixed with vulcanising agents, accelerators and other compounds. The thermal history is the full name of a process and refers to the cumulative amount of heat applied to the rubber mix up to a certain time. Mixing rubber in the mixing of parking, hot refining, calendering, pressing out, pulping, moulding and vulcanisation before the operation, are subjected to the role of heat, so that the thermal history is increasing, because of the rubber has the characteristics of heat accumulation, so the actual scorch time of the rubber material, including the operation of the scorch time and the residual scorch time of the two parts. Operation burnt time is the burnt time consumed during rubber processing due to the heat accumulation effect, which depends on the degree of processing, such as the number of times the rubber is turned over, the degree of hot refining and calendering, pressing out, etc.. Residual charring time is the time during which the rubber remains fluid when heated in the model. There is no fixed limit between the operating burn-in time and the residual burn-in time. It varies with the operation and storage of the binder. If a binder undergoes more operations, it takes up more burn-in time. The less scorch time remains, the closer the starting point of scorching (start of crosslinking) is. The compound loses the necessary fluidity during processing and in modelling and scorching occurs.
