Those with a slight degree of burn-in:
Put the rubber material into the open mill to make a thin pass, and the roll distance can be slightly too large at the beginning, and then adjust the roll distance to 0.5-1.5 mm. At the same time, add 1 to 3 parts of stearic acid. At this time, the roll temperature should be controlled below 45 °C, and the glue loading capacity should be less, which is 1/2 of the conventional rubber mixing capacity. The operation process can be rolled directly by dropping the disc, and the film does not need to be wrapped with rolls. The thin pass is one stage. For the slightly scorched rubber, the thin pass is completed in one stage or two or three stages. Parked for 24 hours, it can be mixed with normal rubber for use.
Those with a slightly heavier focus burn:
At this time, there are a small amount of cooked rubber particles in the rubber compound, but the area is not large and the rubber particles are small. During thin-pass rolling, add 2 parts to 3 parts of zinc salt of pentachlorothiophenol, a peptizer, and mill for 5 minutes, and then add softener. Light-colored or colored compounds can be added with a small amount of rosin or terpene resin; black compounds can be mixed with pine tar. To soften the rubber compound, add about 5 to 10 parts to make it evenly mixed. Thin film after thin pass. This kind of rubber compound can be mixed into the normal use of the rubber compound, but the amount of mixing should not be too much. It is about 5 to 10 of normal glue.
Severe coke burn:
Synthetic rubber such as nitrile rubber. The heat generation is large during the trapping and rolling, and the nitrile rubber is harder and tougher. Scorching is easy to occur during mixing. Especially when there are many filler compounds. At this time, the scorched rubber material is put into the open mill for rolling and thinning as described above, but not only the peptizing agent pentachlorothiophenol zinc salt, but also the activator 420 should be added. Usually, 2 parts of pentachlorothiophenol zinc salt and about 1 part of activator 420 are added. The chemical name of activator 420 is 2, 2 dithiobis (tert-butylated p-cresol), which is a commonly used activator in the production of reclaimed rubber). After adding pentachlorothiophenol zinc salt and rolling for 2 to 3 minutes, then add activator 420 and rolling for 3 minutes, then thin, add softener liquid coumarone resin, or pine tar. Or dibutyl phthalate (for gum butadiene). The peptized and softened scorched compound can be incorporated into the normal production compound. In order to ensure that the quality is not affected, the amount of addition should not be too much. Generally, about 5 parts of the above glue can be added.
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