The use of tire reclaimed rubber to produce rubber products can significantly reduce the cost of raw materials, but during the parking and use of tire reclaimed rubber, Mooney viscosity rebound may occur, which will cause great inconvenience to the processing of rubber products, so the control of tires The stability of Mooney viscosity of reclaimed rubber is something that every rubber product manufacturer is striving to study. Then, why does the rubber rebound of Mooney viscosity appear during the parking of the rubber reclaimed rubber? What are the factors affecting Mooney viscosity? How can I avoid it?
In the regeneration process of reclaimed rubber, the CS or SS bonds are generally cut off to form C·,·S radicals. The internal molecules of the reclaimed rubber are also constantly moving during storage. This process leads to re-crosslinking of already produced radicals, resulting in regeneration. The Mooney viscosity of the rubber product rebounds; the raw material of the tire reclaimed rubber is waste tire rubber powder, and the waste tire rubber powder itself contains a large amount of filler additives such as carbon black and white carbon black to form a filler network, and the filler material is used in the regeneration process. The network will be broken, and the fillers contained in the reclaimed rubber during the parking period will form a filler network again through the molecular thermal movement, which will increase the viscosity of the tire reclaimed rubber, which will make it difficult for the processing of subsequent tire reclaimed rubber products.
The technical personnel of our factory through the continuous exploration, summed up the following points, ease the emergence of tire reclaimed rubber in the park and use of Mooney fluctuations:
1, raw materials and recipes. The raw material of tire reclaimed rubber is used tire tire rubber powder, and then added appropriate amounts of softeners, activators and other chemical compounding agents are processed through multiple special processes. The tire rubber powder directly affects the quality of tire reclaimed rubber products, so it is stable. The raw material source and quality control of the rubber powder are the primary factors for ensuring the stability of the regenerated rubber Mooney; in addition to the quality consistency control of the softener raw material, it is the second important factor to ensure the stability of the regenerated rubber Mooney viscosity; the activator The consistency of quality is a key to ensure that the reclaimed rubber production enterprises must strictly control the purchase of goods.
2, production process. Under the premise of ensuring that the performance of the above raw materials is stable, the production process and the control problems during processing are also one of the reasons for the instability of the Mooney viscosity. In the process of dynamic desulfurization, the three factors of temperature, pressure and time are the decisive factors affecting the quality of reclaimed rubber, and three major elements must be strictly controlled.
3, parked storage. Although the above two issues have better production control, it is possible to produce tire reclaimed rubber with a Mooney viscosity within a certain range. However, after some tire reclaimed rubber has been stored for a period of time, the Mooney viscosity has increased even more than the standard. The main reason is that During storage, the reclaimed glue lacks the necessary free radicals to stop the polymerization inhibitors required, resulting in polymerisation during storage and thus an increase in Mooney viscosity.
If you want to choose a Mooney viscous tire reclaimed rubber, you must consider the overall strength of reclaimed rubber manufacturers, including raw material sources, production equipment, production processes, warehouse conditions and so on.
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