Firstly,silane and titanate coupling agents were added to the magnetic powder for surface treatment in the ingredient mixing stagte,then the extrusion granulation method was used to obtain plastic magnetic particles.Thereafter,the ferrite plastic magnetic products were prepared by injection molding.a focus on studying the effects of the type and amount of coupling agents on the performance of the injection molded magnet.The results show that the magnetic properties of injection molded ferrite prepared with the three silane coupling agents are all high.The mechanical properties of injection molded magnets made with the coupling agents KH-792(N-β-(Aminoethyl)-γ aminopropyltrimethoxysilane are the best,while the flowability of plastic magnetic particles made with titanate as the coupling agent is lower.During the injection molding process,the orientation becomes worse,and the magnetic properties of the injection molded magnets are lower.The surface treatment of ferrite magnetic powder is carried out using KH-792,and the optimal mass fraction of coupling agent addition is 1.0％.The flow performance of plastic magnetic particles produced after surface treatment of magnetic powder is significantly improved compared to the untreated ones.
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