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Rubber Mixing Technology of Dispersion Kneader about One-stage Mixing Method(1)

2018-11-14

Rubber Mixing Technology of Dispersion Kneader about One-stage Mixing Method(1)

KNEADER

One-stage mixing method refers to a method for preparing a rubber compound by adding all the compounding agents at one time, and is commonly used for preparing those rubber materials which have good scorch performance and contain no or only a small amount of active compounding agent. In order to prevent the temperature of the rubber in the mixing from rising too fast, a low-speed mixing is usually carried out in the dispersion kneader. The method comprises the steps of sequentially adding a compounding agent (including a filler, a working oil, a vulcanizing agent, an accelerator, etc.) to the plasticized raw rubber. The mixing cycle is based on the properties of the compound and the rotor speed. During one-stage mixing, the vulcanizing agent and the accelerator are generally added within about 60 seconds before the end of the mixing, or the vulcanizing agent and the accelerator are added to the open film after the discharging. However, no matter which method is used to add the vulcanizing agent and the accelerator, the temperature of the rubber compound during operation must be controlled below 110 degrees (sulfur and accelerator system) or 120 degrees (DCP vulcanization system) to prevent the rubber from scorching. And to adjust them according to different vulcanization systems. The non-dispersible compounding agent or the smaller amount of the compounding agent can be usually prepared into various masterbatch particles or a paste-like mixture to facilitate the addition and rapid incorporation into the rubber.

The disadvantage of one-stage mixing method is that the prepared rubber compound has lower plasticity (high Mooney viscosity), and the compounding agent,such as carbon black sometimes is difficult to disperse evenly, which is prone to scorch hazard, and the physical and mechanical properties of the vulcanized rubber are relatively lower.

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