The Preparation Of The Water-Based Nano-Magnetic Fluids And Their Application In Developing The Electromagnetic Function Textiles

People become more and more concerned about their health and environment, conductive,magnetic or electromagnetic functional textiles had penetrated into people's daily life and played a more important role in the field of antistatic electricity,electromagnetic shielding,protection of magnetic therapy and so on. Depositing the conductive,magnetic materials such as conducting polymer or magnetic particles onto the surface of the textiles, had become the focus of the research of the functional finishing for these years. Because of the active surfaces and attraction of the magnetic nano-particles, they were easily to agglomerate. While the magnetic nano-particles were dispersed stably in the magnetic fluids, which supplied a effective way to prepare magnetic textiles.Firstly, Fe3O4 Water-based Magnetic Fluids are successfully obtained by the method of coupling agent-surfactant in this dissertation. The amount of methyltrimethoxysilane (MTMOS),sodium dodecyl benzenesulfonate (SDBS),distilled water,acetic acid,reaction temperature and time, which were important factors affecting the size and stability(zeta potential,precipitation) of the magnetic fluids, were discussed. The optimum conditions for preparing stable magnetic fluids: when the mass of Fe3O4 nano-particles is 0.1 g, MTMOS 3g,SDBS 0.3g,acetic acid 2mL, react 3 hours under 50℃. Otherwise, the structure and properties of the composite particles were also investigated in detail by TEM, XRD, XPS and VSM.Secondly, the optimum conditions of the magnetic particles deposited onto polyester/cotton fabric were discussed. The textiles could get a highest weight rate at the temperature of 50℃for dipping 80min, the saturation magnetization of the magnetic textiles was 41.309 memu/g.Thirdly, conductive fabric was prepared by in-situ chemical polymerization of PANI, the effect of main factors such as the concentration of aniline hydrochlorides, ammonium persulfate, immersing time, the variety and concentration of the dopant were discussed. The optimum conditions for preparing high PANI conductivity fabrics were as follows:the concentration of aniline hydrochlorides was 0.5mol/L, oxidants was 0.3mol/L, dopants was 0.35mol/L, immersing time was in 6s. The surface resistivity of fabric was 0.5249 kΩ-cm.Finally, the functional-film fabrics consisting of magnetic particles and PANI was prepared by Two-step method, in-situ chemical polymerization conditions were optimized, experimental results demonstrated that the resistance of trial-manufactured PANI/magnetic particles electromagnetic function fabric was much lower than PANI/fabric, In the process of forming PANI/magnetic particles composite films, magnetic particles acted as backbone and helped combine the polymers. FE-SEM and AFM were used to observe and analyze the morphology and structure of the composite films. It could be found that, after polymerization, the PANI generated around the magnetic particles and formed continuous and uniform composite conductive layer on fabric surface.