医用聚氨酯材料化学镀纳米银工艺

Process for Electroless Plating of Nano-Sliver on Medical Polyurethane

为提高医用聚氨酯材料留置人体内时的生物抗菌性能,需在其表面化学镀银。以次磷酸钠为还原剂,聚乙烯吡咯烷酮(PVP)为高分子保护剂,六偏磷酸钠为分散剂,还原硝酸银,将纳米银颗粒还原并沉积在医用聚氨酯内支架管表面,形成纳米银涂层。获得了最佳的化学镀银工艺:0.25mol/LAgNO3,AgNO3与还原剂次磷酸钠的摩尔比为2∶1,温度40℃,时间30min。采用本工艺,纳米银颗粒平均粒径为20～30nm,镀液中添加高分子保护剂和分散剂可以阻止颗粒长大,提高纳米银颗粒的分散均匀性。本工艺在医用领域具有较好的前景。

It is imperative to introduce electroless plated silver on polyurethane as biomaterials for medical devices and implants so as to improve the anti-bacte-rium performance.Thus electroless nano-silver coating was pre-pared on the surface of polyurethane by reducing silver nitrate with sodium hypophosphite in the presence of polyvinylpyrrolidone (PVP) as a protective agent and sodium hexametaphosphate as a dispersant.The optimized process for electroless plating of nano-silver coating was established.Results indicate that nano-silver coating with an average diameter of 20 ～ 30 nm can be prepared on the surface of polyurethane at AgNO3 concentration of 0.25 mol/L,molar ratio of AgNO3 to reducer of 2 :1,bath tempera-ture of 40 ℃ and reaction time of 30 min.Introduction of polymer protection agent and dispersant could prevent Ag particles from growing and improve the dispersion uniformity of silver nanoparti-cles.The established electroless plating process had a promising prospect in medical application.