碳包覆铁/丙烯酸树脂水性纳米复合涂料的制备及电磁波吸收性能

Preparation and Microwave Absorbing Properties of Carbon-coated Fe Nano-particles/Waterborne Acrylic Resin Composite Paint

以"壳/核"型碳包覆铁(Fe(C))纳米颗粒为填料、水性丙烯酸树脂为基体,制备了纳米复合电磁波吸收涂料。采用不同含量的十二烷基苯磺酸钠(SDBS)对纳米颗粒改性,提高了纳米颗粒在基体中的分散性。选用吸收剂填充量为25%(质量分数)的涂料,测定了不同厚度涂层的电磁波吸波性能。涂层具有很好的吸波性能,当厚度为5mm时,反射损耗峰值为-17.2dB,吸收带宽为3.2GHz(7～10.2GHz)。首次用实验结果证明了传输线理论对铁磁性纳米颗粒吸波性能的模拟结果。

The microwave absorbing properties of the coatings containing 25wt% of the carbon-coated Fe nanoparticles with various thickness are tested, in which the waterborne acrylic resin is used as the matrix： To improve the dispersion of the nano-particles in resin, sodium dodecyl benzene sulfonate （SDBS） is selected as the surfactant. By comparison of various samples containing different amounts of SDBS, it is found that 12wt% of SDBS addition is a critical quantity to change the hydrophobic surface of the carbon-coated Fe nano-particles into hydrophilic. The results show that the coatings have excellent absorbing properties with thickness of 5ram, presenting the reflection loss of -17. 2dB at 8. 6GHz and the bandwidth of -10dB at 3. 2GHz （7 - 10. 2GHz）. Based on the current results, it is firstly confirmed that the absorption properties of ferromagnetic nano-particles are basically consistent with the theoretical prediction of transmission line.