(I) The treatment of the burnt rubber material:

(1) Slight degree of focusing:

The rubber material is put into the opening mill to roll thin, and the roll distance can be a little too much at the beginning, and then the roll distance is reduced to 0.5 ~ 1.5 mm. Add l to 3 parts stearic acid at the same time. At this time, the roller temperature should be controlled below 45℃, and the filling capacity should be less, which is 1/2 of the conventional mixing capacity. The operation process can be rolled by direct falling plate, and the film does not need to wrap the roller. Every 5 times of thin passage is a stage, and the thin passage is a stage or two or three stages for the mildly burnt rubber material. Park for 24 hours, can be mixed with normal glue used.

(2) Focusing degree is slightly heavier:

At this time, there is a small amount of cooked rubber particles in the rubber material, but the area is not large and the rubber particles are small. The film can be rolled through thin on the opening mill, and the roller temperature and roller distance are the same as the above operation. Add the plasticizer pentachlorophenol zinc salt in 2 parts and 3 parts for 5 minutes and then add the softener. Light color or color adhesive, can add a small amount of rosin or terpene resin; Black gum can be mixed with pine tar. To soften the glue, add about 5 ~ L0, so that the mixing is uniform. Thin pass after the next slice. This kind of glue can be mixed into the normal use of glue in the application, but the dosage should not be too much. About 5 ~ 10 normal glue can be.

(3) Serious degree of focusing:

Synthetic glue such as nitrile glue. Trapped rolling when the heat is large, nitrile rubber is harder and tougher. It is easy to burn when mixing. Especially when filling agent is more. At this time, the burnt rubber material can be put into the opening mill for rolling and thin passing, as mentioned above, but not only the plasticizer pentachlorophenol zinc salt is added, but also the activator 420. Usually, 2 parts of pentachlorophenol zinc salt and 420 l parts of activator are added. The chemical name of activator 420 is 2, 2 dithio-bis (tert-butylated p-cresol), which is often used in the production of reclaimed rubber. Add pentachlorophenol zinc salt rolling for 2-3 minutes, then add activator 420 rolling for 3 minutes, and then thin, add softener liquid gumaron resin, or pine tar. Or dibutyl phthalate (for butanol). After plasticizing and softening, the coke glue can be mixed into the normal production glue. In order to ensure that the quality is not affected, the amount of adding should not be too much, generally can be added to the above glue 5 copies or so.

(2) To prevent burning in the process of production process operation:

The following measures should be taken to prevent burning in production:

1 raw materials should be weighed accurately, especially important is the dosage of accelerator and vulcanizing agent should be weighed accurately, avoid scale failure or weighing error all kinds of accelerator to be identified, do not get it wrong.

2. The order of adding ingredients should be correct when mixing, usually as follows:

Raw rubber - zinc chloride, stearic acid - aging agent - reinforcing agent and oil softener alternately add a sulfur - accelerator - rubber material.

It is safer to reverse the feeding order and add the accelerator at the last stage when rolling at higher temperatures.

3. When adding accelerant and vulcanizing agent, it should be added in multiple batches. The amount of each batch should be small and the distribution should be uniform. Avoid focusing on local areas and causing scorch.