What do you think of this picture of rubber vulcanization test? And what do numbers like VC1vc2ts1ts2t10-t90 stand for?

Four important parameters that have practical guiding significance for rubber vulcanization are: maximum torque, minimum torque, TS2 and TC90.

1. The minimum torque is the original elastic torque of the rubber mixture before vulcanization.

2. The maximum torque is the elastic torque of the compound after vulcanization.

3.TS2 is the time when the torque of rubber mixture reaches (minimum torque +2). At this time, the vulcanization rate of the compound reaches a certain rate, which can be indirectly considered as the time when the compound is basically set.

4.TC90 is the ripening time of rubber compound, which can be indirectly considered as the time when the vulcanization degree reaches 90%.

From the point of view of polymer, the data measured by rheometer is only a relative data. Unless the test conditions are completely consistent with the production conditions, it is completely meaningless to analyze the data alone. If it must be said, then assuming that the test conditions of rheometer are consistent with the extrusion conditions, if the extrusion time is less than TS2, the rubber will not die.

Extended data:

Rubber vulcanization process: a complete vulcanization system is mainly composed of vulcanizing agent, activator and accelerator;

1, induction stage: firstly, the interaction of sulfur, accelerator and activator increases the solubility of zinc oxide in the rubber compound, and the activation accelerator is a more active intermediate product generated by the reaction of accelerator and sulfur.

2. Corresponding vulcanization curve → scorch stage: operating scorch time and remaining scorch time. Its length is related to the safety of production and processing, depends on the composition of rubber compound, and is mainly influenced by accelerator.

3. Operating scorch time: the scorch time consumed due to heat accumulation effect during rubber processing.

4. Remaining scorch time: the time for the rubber compound to keep its fluidity by heating in the model.

5. Cross-linking stage: Cross-linking bonds corresponding to vulcanization curves are generated by the chain reaction of cross-linkable free radicals (or ions) and rubber molecules → thermal vulcanization stage: the length of time depends on temperature and rubber compound formula. The higher the temperature is, the more accelerator is used and the faster the vulcanization speed is.

6. The slope of the curve represents the curing reaction speed. The greater the slope, the faster the curing reaction speed and the higher the production efficiency.

7. Network formation stage: In the early stage of this stage, the crosslinking reaction has been formed, the crosslinking bonds in the initial stage have been shortened, rearranged and broken, and finally the network tends to be stable, and the vulcanizate with relatively stable network is obtained.