When the vulcanizate is subjected to alternating stress, the phenomenon that the structure and properties of the material change is called fatigue. With the progress of fatigue, the phenomenon leading to material failure is called fatigue failure.
A: The influence of rubber structure, rubber with low glass transition temperature has good fatigue resistance. Rubbers with polar groups have poor fatigue resistance. Rubbers with large groups or side groups in the molecule have poor fatigue resistance and rubber with a regular structural sequence. They tend to cluster toward crystals and have poor fatigue resistance.
B: The effect of rubber vulcanization system. The vulcanization system of monosulfan has the lowest fatigue performance and good fatigue resistance. Increasing the amount of crosslinker will reduce the fatigue performance of vulcanizates. Therefore, the amount of cross-linking agent should be minimized.
C: The effect of filler. The smaller the reinforcing performance, the smaller the effect of the filler. The larger the amount of filler, the greater the impact. The filler should be used as little as possible.
D: the impact of the softening system, as far as possible, choose a non-viscous softener with a low softening point; use as much softener as possible, on the contrary, high-viscosity softeners should not be used, such as poor fatigue resistance of pine tar, plasticization of lipids The fatigue resistance of the agent is good.