Ag包覆ACR微球的制备及性能

Preparation and performance of silver coating ACR microspheres by electroless plating

采用盐基胶体钯和硝酸银活化工艺,以甲醛为还原剂,在丙烯酸酯类共聚物(ACR)微球表面化学镀银。利用电化学工作站研究pH值对镀液稳定性的影响,并通过扫描电镜(SEM),X射线能量色散谱仪(EDS)和X射线衍射仪(XRD)对复合粉体进行表面形貌、成分以及分布进行研究与分析。结果表明:pH值为12.9的镀液表现出较强的极化作用和稳定性,盐基胶体钯对ACR微球的活化效果优于硝酸银的相应活化效果,镀液中AgNO3浓度升高有助于Ag的析出,选用AgNO3浓度为15 g/L的镀液,可以制得镀层包覆完整、均匀、致密的银包覆ACR微球复合粉体。

Using formaldehyde as reducing reagent,electroless silver planting on the surface of acrylic copolymer（ACR） microspheres were prepared by activating process with salt-based colloid palladium and silver nitrate activation solution.The stability of baths under different pH values were evaluated by electrochemical workstation.The morphologies of the particles were studied with scanning electron microscopy（SEM） and their chemical composition and element distribution were confirmed by energy dispersive spectroscopy（EDS） and X-ray diffraction（XRD）.The results show that the bath shows the best stability and the strongest polarization when the pH value is 12.9.Compared with the silver nitrate activation solution,the salt-based colloid palladium has better activation effect on the ACR microspheres.The exhalation percentage of Ag increases with increasing silver nitrate concentration in bath.The uniform and dense silver coating for silver-coated ACR microspheres composite powders can be obtained when the silver nitrate concentration is 15 g/L.