聚氨酯乳液/纳米石墨微片复合导电涂料的制备及其电磁屏蔽性能

Preparation of Polyurethane-emulsion/Graphite Nanosheets Composite Conductive Coating and Its Electromagnetic Shielding Property

以纳米石墨微片为导电填料,聚氨酯乳液为基体,制备水性导电复合涂料,研究其导电性能和电磁屏蔽性能。结果表明,质量分数为35 wt%纳米石墨微片,粘度区间160～180 MPa·s,质量分数为2%的 OP-10分散剂为最佳配方,最佳施工工艺为超声波分散30 min 后喷涂,涂层厚度控制在80 μm左右,在65℃的条件下固化。通过该法制备得到的导电涂料,其涂层表面电阻率降低至7.5 Ω·cm^(-2),平均的电磁屏蔽效能在27 dB左右(300 kHz～1.5 GHz)。

A waterborne conductive coating based on graphite nanosheets （GNs） and polyurethane-emulsion has been developed, the surface conductivity and electromagnetic shielding effectiveness of the conductive coating were discussed. After the experiment, the optimal parameters for the component are as follows： 35 wt% of graphite nanosheets, 2 wt% of OP-10 dispersant and viscosity between 160 MPa·s and 180 MPa·s. The best construction process is： ultrasonic dispersion for 30 minutes, controlling the thickness of the coating at about 80 um and cured at 65 ℃. Then, the surface resistivity of the conductive coating decreased to 7.5 Ω·cm^-2, and its average shielding effectiveness was about 27 dB （300 kHz-1.5 GHz）.