Causes and treatment of scorch of rubber compound：

1. Improper cooperation
Such as vulcanizing agent, the amount of accelerator is too much;

2. Improper rubber mixing operation
If the temperature of the rubber mixer is too high, the cooling device is not good, or the sulfur is added too early, or the vulcanizing agent and accelerator are locally highly concentrated due to uneven dispersion, or the roll is prematurely rolled without heat dissipation, or the roll is too large, Or not sufficiently cooled after unloading;

3. Improper Parking
Including the rubber has been parked for too long, the temperature of the parking place is too high, or the air is not ventilated, or it has been stacked for a long time after hot-melting.

Prevent scorch：

The general amount of anti-scorch agent should not exceed 0.4 parts, and it should be added before vulcanizing agent and accelerator.

The method to prevent the scorch of the rubber compound of the internal mixer: the scorch of the rubber compound of the internal mixer is more common in the rainy season. Thanks to the Mooney viscometer and vulcanometer, it can be measured at any time whether it is freshly mixed or re-mixed, which can prevent the scorching of the compound. In an internal mixer plant where high-volume compounds are produced, it is not necessary to carry out a comprehensive measurement, and only one measurement method can be used for the compounds that require attention.


Treatment of scorch：
On the open mill, the roll temperature is low, and the glue loading capacity is small. It cannot be wrapped, packaged, rolled, parked for 24 hours, and then mixed into the good material for use, and the mixing amount is 15-20%. When the scorch is serious, add stearic acid and oil softener to destroy its cross-linked structure.