Optimization Of Magnetorheological Elastomer Preparation Process And Performance Study

Magnetorheological elastomers have attracted much attention because of their great potential in vibration reduction and noise reduction.Magnetorheological elastomer is a Smart magneto-controlled material prepared from ferromagnetic particles and polymer matrices.It can effectively solve the problems of ferromagnetic particle deposition,sealing difficulty and environmental pollution in the use of magnetorheological fluid.Its modulus,damping,deformation and other material properties can be real-time controlled by external magnetic field.In order to prepare magnetorheological elastomers with good consistency,high mechanical strength and convenient engineering applications,this paper takes silicone rubber-based magnetorheological elastomers as the research object and conducts an in-depth study on their preparation process and performance testing.Firstly,an exciting device which can produce uniform and controllable magnetic field is designed and developed,and an anisotropic magnetorheological elastomer is prepared.Then,the design and comparative analysis of two kinds of preparation schemes at room temperature and high temperature vulcanization are carried out from many aspects such as efficiency and process.The development plan of methyl vinyl silicone rubber as the base and high temperature vulcanization is finally determined.Secondly,based on the development scheme of methyl vinyl silicone rubber as the matrix and high-temperature vulcanization,magnetorheological elastomer samples under different prestructured magnetic fields are prepared.The internal microstructure of magnetorheological elastomer is observed by electron microscope,and the static mechanical properties of the samples are tested by universal material testing machine.According to the test results,the development scheme of adding silane coupling agent to modify the matrix is further proposed,and the preparation process is optimized.Finally,based on the above matrix modification development scheme and the optimized preparation process,magnetorheological elastomer samples are prepared,and their static and dynamic mechanical properties are tested and analyzed.The experimental results show that the tensile strength of magnetorheological elastomer can be increased by using small particle size carbonyl iron powder.The matrix can be modified by adding proper coupling agent.The magnetorheological effect and tensile strength can be enhanced.This provides an ideal solution to the contradiction between magnetorheological effect and mechanical strength.By optimizing the preparation process of magnetorheological elastomers with good consistency and high mechanical strength can be prepared.