Vulcanized capsules are indispensable thin-walled rubber products in the production of tires. They are used in the two processes of tire shaping and vulcanization, and more use of butyl rubber. With the continuous progress of reclaimed rubber production process, more and more butyl vulcanized capsules The manufacturer began to use butyl reclaimed rubber in the vulcanized capsules; the vulcanized capsules were used under the dynamic conditions for a long time under the dynamic conditions, and the heat generated inside could quickly dissipate directly to reflect the quality of the vulcanized capsule products. How can we improve the thermal conductivity of butyl sulphide capsules? In the actual production and use process, the thermal conductivity of the vulcanized capsule rubber will not only affect the quality of the finished product, but also directly affect the processing process and vulcanization process of the rubber compound. Therefore, the rubber product manufacturer will take many measures to improve the thermal conductivity of the butyl sulfide capsule. performance.
1. Choose the right kind of carbon black
Carbon black is a necessary reinforcing filler in butyl vulcanized capsules. It can significantly improve the physical and mechanical strength of rubber compounds in vulcanized capsule formulations containing butyl reclaimed rubber; a wide variety of carbon blacks, different types of carbon black rubber compounds The thermal conductivity has different effects. Under normal circumstances, the higher the carbon black filling amount and the better the thermal conductivity of the rubber compound, the butyl rubber/butyl regenerated rubber vulcanized capsule formula can be used to improve the filling amount of the low-structural semi-reinforcing carbon black to improve the butyl-vulcanized capsule. The thermal conductivity of acetylene black is better than that of furnace black to improve the thermal conductivity of the rubber; butyl vulcanized capsule manufacturers can choose appropriate and appropriate amount of carbon black to improve the thermal conductivity of the rubber.
2. Use metal powder
Metal powder generally refers to metal powder with a diameter of less than 1 mm. It is a metal material often used in the production of rubber products, which can significantly improve the thermal conductivity of butyl capsules. The metal powder commonly used in the production of rubber products is silver powder, copper powder and aluminum powder. The price of silver powder is quite high, and the copper powder is prone to oxidation and degradation problems in the rubber compound. Therefore, the aluminum powder becomes a rubber compound in the production of butyl sulfide capsules. Ideal material for thermal conductivity; however, in the actual application process, the addition of aluminum powder will improve the flammability of butyl rubber/recycled rubber compound. Therefore, it is necessary to control the thermal conductivity of butyl sulfide capsule by adding metal powder. The amount of aluminum powder.
3. Add thermal decomposition graphite fiber
Graphite fiber is a fibrous material with a layered hexagonal lattice graphite structure with a carbon content of more than 99% and a graphitized internal molecular structure. It has good rigidity, dimensional stability, electrical conductivity and thermal conductivity, and has been specially treated for thermal decomposition. The interface affinity between the graphite fiber and the rubber is better, and the thermal conductivity of the butyl sulfide capsule can be significantly improved.
4. With PTFE additives
Polytetrafluoroethylene (PTFE), heat-resistant, acid-resistant, alkali-resistant, and organic solvent-resistant, is a commonly used additive in the production of rubber products, which can significantly improve the physical and mechanical strength, chemical corrosion resistance and heat resistance of rubber products; The PTFE compounding agent can be used in the production of butyl rubber/recycled rubber vulcanized capsules to improve the thermal conductivity of the rubber compound and improve the serviceability and service life of the butyl sulphurized capsule.
Adding the above four compounding agents to the vulcanized capsule formula produced by butyl rubber or butyl reclaimed rubber can not only improve the thermal conductivity of the butyl vulcanized capsule, but also improve the processing performance of the rubber compound; For capsule manufacturers, Xiaobian recommends using low-structural semi-reinforcing carbon black to improve the physical and mechanical strength of the rubber compound while improving the thermal conductivity of the rubber compound.