What are the manufacturing methods for heat-resistant conveyor belt cover rubber?
1. The main material, the cover tape of the ordinary conveyor belt is mainly natural rubber, or a small amount of SBR is added. The material of the heat-resistant conveyor belt covering glue is mainly SBR, and the SBR covering rubber carbonized layer is formed to have better heat resistance and aging resistance. Ethylene propylene diene monomer (EPDM) can also be used as the cover rubber material. Jingbo Rubber has many years of production experience. As a covering collagen material, EPDM rubber has excellent oxidation and heat resistance. The disadvantage is that the bonding degree between the core and the cover rubber is insufficient, and the carbonized layer is formed slowly.
2. the vulcanization system, generally using ordinary sulfur, there are more polysulfide bonds in the rubber compound, but the performance declines faster in the thermal oxygen aging stage, and has lost value without forming a carbonized layer. The heat-resistant conveyor belt is preferably a sulfur donor, such that the ratio of monosulfide bonds to disulfide bonds in the rubber compound is 90%, and the performance in the thermal oxygen aging phase is not greatly reduced, and a carbonized layer can be formed. In addition, in order to keep the carbonized layer cracked evenly, the amount of zinc oxide should be appropriately increased to improve the thermal conductivity of the rubber compound.
3. Reinforcing system, carbon black plays an important role in the quality of the carbonized layer, because carbon black is the main component of the carbonized layer. The more the carbon black is used, the longer the service life of the rubberized carbonized layer is. When the amount of carbon black is 67 parts, the carbonized layer has the longest service life.
4. the protection system, the need to use anti-aging agent BLE and RD, when the amount of anti-aging agent BLE reached 1.5, RD dosage reached 0.8, the carbonized layer has the longest service life.