Summary: The temperature for mixing in a general internal mixer is between 0-400 ℃. What is the appropriate temperature for mixing in an internal mixer? The mixing temperature of the internal mixer is determined based on the material characteristics of the rubber material.
What is the appropriate mixing temperature for a general internal mixer, which ranges from 0-400 ℃? The mixing temperature of the internal mixer is determined based on the material characteristics of the rubber material. Mixing and excessive temperature can reduce the mechanical shear effect on the rubber material, resulting in uneven mixing and exacerbating the thermal oxidation cracking of rubber molecules, leading to a decrease in the physical and mechanical properties of the rubber material. At the same time, it will also cause too much chemical separation between rubber and carbon black to generate too much gel, which will reduce the plastic degree of the rubber and make the rubber surface rough, resulting in difficulties in the later calendering and chip production.

matters needing attention
For special materials, there are also temperature considerations during the mixing process in the internal mixer. If encountering sulfur, moisture absorbing agents, or calcium oxide materials, attention should be paid during mixing:

1. The initial mixing temperature for adding sulfur and accelerator should be below 90 degrees, and the discharge temperature should not exceed 110 degrees. The mixing time should generally not exceed 2 minutes to prevent burning.

2. The addition of moisture absorbing agent calcium oxide should generally not be mixed for a long time under conditions exceeding 120 degrees, otherwise it should be added after refining.