Scorching method for rubber compound treatment! Factory Suppliers Manufacturers Quotes

Scorching method for rubber compound treatment!

(1) treatment of burnt charred materials:

(1) slight burn up:

The rubber material is put into the open mill for thin rolling. At the beginning, the roll spacing can be a little too small, and then the roll spacing can be reduced to 0.5-1.5 mm. At the same time, l ~ 3 stearic acid was added. At this time, the roller temperature should be controlled below 45 C, the loading capacity should be less than 1/2 of the conventional rubber mixing capacity, the operation process can be used to directly drop rolling, film does not need to roll, every five times through thin pass into a stage, for mildly coked rubber, thin pass through one stage or two or three stages. Parking for 24 hours can be used in normal rubber compound.

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(2) a slightly heavier focus:

At this time, there are a small amount of cooked rubber particles in the rubber, but the area is small, the rubber particles are small, can be thin film in the mill through rolling, roll temperature and roll spacing are the same as the above operation. The plasticizer pentachlorothiophenol zinc salt was added into thin strip mill for 2 parts and 3 parts, and the mill was milled for 5 minutes, then the softener was added. Light-colored or colored rubber, a small amount of rosin or terpene resin can be added; black rubber can be mixed with pine tar. The compound is softened, and the addition amount is about 5 ~ l0 parts, so that it can be mixed evenly. Thin film after the lower slice. This kind of rubber can be mixed into the normal use of the rubber, but the dosage should not be too much, about 5-10 normal rubber can be.

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(3) the degree of burning is serious:

Synthetic adhesives such as acrylonitrile butadiene rubber, difficult rolling heat, nitrile butadiene rubber is more rigid and tough, easy to burn when mixing. Especially when filling agents are more numerous. At this point, the scorched rubber can be put into the mill for rolling and thinning as mentioned above, but not only the plasticizer pentachlorothiophenol zinc salt is added, but also the activator 420 is added. Usually five chlorinated zinc thiols and 2 activator 420 are added to L. The chemical name of activator 420 is 2, 2 dithiobis (tertiary butylated p-cresol), which is commonly used in the production of regenerated rubber. After adding zinc pentachlorothiophenol salt for 2 to 3 minutes, then adding activator 420 for 3 minutes, then thin pass, adding softener liquid gumarone resin, or pine tar, or dibutyl phthalate (for butadiene-acrylic acid). The scorched and burnt rubber compound can be blended into the normal production rubber compound. In order to ensure that the quality is not affected, the addition amount should not be too much. Generally, about 5 parts of the adhesive can be added.

(two) prevent scorching during the production process.

The following measures should be taken to prevent scorching:

1. Raw materials should be weighed accurately, especially the amount of accelerators and vulcanizates should be weighed more accurately, avoid scale failure or weighing errors of various accelerators to distinguish, do not make mistakes.

2. when mixing, the order of adding material must be correct. The order of mixing is usually as follows:

Zinc monochloride, stearic acid, antioxidant, reinforcing agent and oil softener were alternately added with sulfur, accelerator and rubber mixture.

Avoid rolling at a higher temperature, feeding sequence reversed, accelerator added at the last stage, this is safer.

3. Accelerators and vulcanizates should be added in batches, each batch should be small, and should be evenly distributed. Avoid focusing on local areas, causing scorching.

4. we should strictly control the roller temperature or the temperature of the mixer chamber, strengthen the cooling water circulation and accelerate the cooling. The use of low temperature deep well water to cool, the effect is better at the same time should be stored in a lower temperature of the rubber place, do not close to the heating heat flow or direct sunlight exposure.

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