Polybutadiene rubber is seldomly used alone while mixed with other rubbers instead. The butadiene rubber has low cohesion strength and weak self-adhesive adhesion.
In the mixing process, the raw rubber is broken, the compound is poorly dispersed, and the roll off is easy to occur. It is not easy to press the synthesis sheet and easy to roll off, so it is appropriate to use small roll moment and low roll temperature (40 ~ 50 ℃) mixing.
In order to make the complex evenly dispersed, supplementary processing is needed. When mixing with internal mixer, the capacity can be increased by 10%, and the mixing temperature can be slightly higher to facilitate the dispersion of the complex.
The rubber discharging temperature is generally in the range of 130 ~ 140 ℃. This can save 40% of the refining time. When carbon black content is large or fine particle carbon black with high structure is used, two stages mixing must be used to disperse evenly, and reverse mixing method can also be used.
Shape
Polybutadiene is difficult to band in a two roll mixing mill.
Therefore, a thin sheet of polybutadiene may be prepared and kept separate.
Then, after proper mastication of natural rubber, the polybutadiene rubber is added to the two roll mixing mill.
A similar practice is adopted if polybutadiene is to be mixed with Styrene Butadiene Rubber (SBR). Polybutadiene rubber may be added with Styrene as an impact modifier.
Besides, high dosages may affect clarity of Styrene.【14】
Updated on May 30, 2022; 58 page visits from 7 June 2021 at 6:47 to 24 April 2025 at 23:51
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