Synthsis Of The Magnetic Conductive Adhesive

The magnetic components were widely diffused in the market with thedevelopment of science and technology. One of the most important research topics washow to make the magnetic components have high reliability, high efficiency, lowpollution and low cost. Bonding process, one step of components manufacturing, had agreat effect on the properties of final products.Traditional bonding process of magnetic components was welding technology. Butwelding process had disadvantages i.e. high pollution, high energy consumption, andhigh welding temperature, which constrained its application in manufacturing magneticcomponents. Thus some other bonding process emerged. The development of low-costand environmentally-friendly magnetic components became research focus instead ofthe traditional materials. Thermal curing permeability adhesive was a great potential fordevelopment of new connecting material, which could be used between elements andcomponents, components and substrate. The magnetically conductive adhesiveexhibited high strength magnetic properties, and also had excellent mechanicalproperties.In this research, thermal curing high temperature permeability adhesive wassynthesized by using bisphenol A epoxy resin E-44as the magnetic conductive adhesivebase body, maleic anhydride as the curing agent, KH-550silane coupling agent as thedispersing and coupling agent, acetone and ethylene glycol diglycidyl ether as differentdiluents, the carbonyl iron powder as the permeable filler. It was discussed what effectson the Shear strength, the saturation magnetization, the effective magnetic permeability,the thermal performance by using different curing temperature, curing time, curingagents and its amount, diluents and amounts of the reducing and carbonyl ironpowder.The IR and DSC were used to research the preparation process and the preparationparameters. Meanwhile the TGA, VSM, LCR analyzer, universal tensile machine andaging test were used to discuss the thermal decomposition temperature, magnetic properties, mechanical properties and weather resistance of the permeability adhesivecured sample.In the experiment it was shown that the preparation of magnetic conductive adhesivewas simple and exhibited excellent mechanical properties (shear strength≥18MPa),superior magnetic properties (saturation magnetization≥2800Gs, efficient magneticpermeability≥2.5) and high thermal decomposition temperature (decomposition startingtemperature=230℃). And the samples’ properties changed little after the atmosphericaging test, heat aging test (150℃/24h), which meant the magnetic conductiveadhesive could meet the application requirements.