1. Rubber molecular structure Where the molecular chain is soft and the glass transition temperature is low, the fluidity is generally good.
2. The molecular weight should not be too high. If the average molecular weight is more than 1 million, the molecular chain entanglement will be intensified, which is not conducive to flow. Natural rubber is advantageous for fluidity because it contains a low molecular component. Increasing the mastication time is also an effective measure to improve liquidity.
3. The temperature rise of the processing temperature will inevitably lead to a decrease in viscosity, which is advantageous for the fluidity of the rubber compound.
4. Elastic memory effect Once the rubber plug is out of the stress state during processing, there will be a strong tendency to elastic recovery, resulting in changes in shape and size. This recovery process continues until equilibrium, which is also characteristic of rubber fluidity. From the processing point of view, this is not conducive to the shape and size stability of the rubber plug, which needs to be solved by formulation adjustment and plastic processing.
