Study On The Influence Of Multiple Network Structures On Damping Performance Of CIIR

In recent years,people have put forward higher requirements for viscoelastic damping materials because of the rapid development of science and technology and the iterative updating of industrial equipment.Chlorobutyl rubber(CIIR)possesses good damping properties due to its unique liquid-liquid transition and glass transition,but CIIR has poor processing properties and poor damping properties at room temperature and above it.In order to solve the above problems,the following aspects have been carried out in the research of this topic.First of all,in the first part of this paper,the effect of NR and EPDM ratio on the vulcanization characteristics,mechanical properties and damping properties of CIIR was investigated.The results show that NR leads to a shorter process positive vulcanization time(t90)for NR/CIIR composites and EPDM leads to a longer t90 for EPDM/CIIR composites.Both NR and EPDM will improve the mechanical properties of CIIR,but will reduce the damping properties of CIIR.Secondly,in order to broaden the damping temperature range of CIIR and improve the loss factor(tanδ),the effects of NBR on the vulcanization characteristics,mechanical properties,microstructure and damping properties of NBR/CIIR composites were firstly investigated.After comprehensive consideration,the NBR/CIIR=20/80 ratio was chosen for the next step of the study.To further improve the damping performance of the NBR/CIIR composites,hydrogen bonding was introduced by blending PA.The results showed that the addition of PA broadened the damping temperature domain of the NBR/CIIR composites at and above the room temperature part and improved the tanδ of CIIR.Finally,in this research,the rubber ball laser displacement information acquisition device was designed and built independently.A new method of using the rebound behavior of the rubber ball to characterize the CIIR is proposed.The theoretical analysis of the rebound process of the NR/CIIR rubber ball and EPDM/CIIR rubber ball,respectively,was carried out as an example.The meanings of rebound height and rebound number were analyzed.The damping index DI is defined to characterize the damping performance of the material by considering the rebound height,rebound number and rebound time.The deformation process when the rubber ball was in contact with the ground was analyzed,and through theoretical derivation,the rebound height prediction equation of the rubber ball was obtained,which can predict the damping performance of the rubber ball.