用于木材的水性纳米复合导电涂料的制备与性能研究

Preparation and Property of Aqueous Conductive Nanocomposite Coating for Wood Substrate

选用阳离子醚化淀粉为基体,导电炭黑为导电填料,水为分散介质,采用机械共混的方法制备了水性纳米复合导电涂料,通过SEM表征了其微观结构,TG分析了其热稳定性,并研究了水性纳米复合导电涂料制备过程中不同因素对涂料涂覆性能、黏度、导电性能的影响。结果表明:制备过程中乳化时间越短、淀粉含量越大、NaOH含量越少,所得纳米复合导电涂料的黏度越大;所制备的水性纳米复合导电涂料具有良好的导电性,导电炭黑颗粒聚集体均匀地分散在阳离子醚化淀粉基体中,且随着导电炭黑含量的增加,涂层的表面方阻减小;导电涂料的热稳定性好,使用导电涂料的木板粉末喷涂效果良好,固化后表面均匀平整光滑,无明显缺陷。

An aqueous conductive nanocomposite coating was prepared via blending water soluble cationic etherified starch as matrixand conductive carbon blackas filler in an aqueous medium. The microstructure of the coating was observed by SEM, and the thermostability was investigated by TG. Furthermore, the influence of several factors including emulsifying time, content of starch, filler and NaOH on viscosity and conductivity of the coating was also charac- terized. The results showed that less emulsifying time, more starch and less NaOH resulted in higher viscosity of the conductive coating.Excellent conductivity was obtained by this method. Conductive carbon black was uniformly dispersed in the cationic etherified starch matrix, and surface square resistance decreased with the increase of conductive carbon black content. Ther- mostability met the requirements of powder coating for wood, of which the surface was smooth after curing.