Coupling agent is a plastic additive, commonly used in plastic processing to improve its processing performance, the application of rubber is relatively small. In fact, the coupling agent plays an important role in rubber and product processing, especially in the processing and production of reclaimed rubber.
As with the plastics field, coupling agents are generally used as modifiers in reclaimed rubber, especially silane coupling agents, which act both with hydroxyl groups in the inorganic filler and with the long molecular weight of the rubber, Different kinds of materials are "coupled" to improve the performance of the compound.
Recycled rubber compound to add coupling agent, can adjust the Mooney viscosity of reclaimed rubber to improve the cross-linking density of vulcanization system, to extend the curing time, but the amount of coupling agent should also be appropriate, otherwise it would be counterproductive.
1. The Mooney viscosity of reclaimed rubber will gradually decrease as the amount of coupling agent increases, which will increase the plasticity of reclaimed rubber. This is the result of the interaction between the coupling agent and rubber long chain molecules.
2, Coupling agent can change the regeneration rubber curing time: With the increase of the coupling agent, regeneration rubber vulcanization time, if you want to extend the regeneration rubber vulcanization time, so that the vulcanization of the rubber more evenly and fully, you can consider not affecting the plastic Materials and products under the premise of adding a certain amount of coupling agent.
3, silane coupling agent in the curing system, can be used as a secondary vulcanizing agent, the coupling agent increases, the crosslinker density increases, the tensile strength increases, the elongation at break decreases. (In order to improve the tensile strength of reclaimed rubber and add coupling agent, we must control the amount of coupling agent, because the amount is too large, too large coupling macromolecules, plastic material bound by the relatively large internal constraints, leading to rubber inside Uneven stress distribution and tensile strength decrease.)
4, acid ester coupling agent and silane coupling agent is different, it can improve the elongation of the recycled rubber elongation, the greater the amount, the greater the elongation.
In summary, the reclaimed rubber production and processing, adding coupling agent must be appropriate, and according to your rubber "modified" needs to choose the right coupling agent products.
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