摘要
以分子量为58000的聚乙烯吡咯烷酮(PVP)作为模板,用由正戊醇、乙醇、去离子水以及0.18 mol/L柠檬酸钠组成的溶液作为前驱液,利用氨水和正硅酸乙酯(TEOS)合成了一定长度的SiO_(2)线,再用少量的盐酸多巴胺和三羟甲基氨基甲烷包覆硅线后以TEOS生成纳米球沉积在SiO_(2)线上,形成枝芽状微纳结构。随后将其加入自制支链含脲和酰胺键的新型聚氨酯中,考察了上述枝芽状粉体对聚氨酯涂膜疏水性、透过率和机械性能的影响,并与球形和线形SiO_(2)粉体进行比较。结果表明,枝芽状SiO_(2)粉体与树脂的相容性和分散性有所改善。在添加量为3%时,聚氨酯涂膜的透过率达到90.99%,拉伸强度较纯树脂增加了3.1 MPa而达到8.4 MPa,涂膜的热稳定性、耐水性、疏水性以及在玻璃上的附着力都有所提高,铅笔硬度更是达到了6H,磨损率低至6.1 cm^(3)/(N·m)。
SiO_(2)wires with a certain length were synthesized by adding ammonia water and ethyl orthosilicate(TEOS)to a precursor solution comprising n-pentanol,ethanol,deionized water,and 0.18 mol/L sodium citrate with polyvinylpyrrolidone(PVP,molecular weight 58000)as template,and then coated with a small amount of dopamine hydrochloride and trimethylolamimaline.Subsequently,nanospheres were deposited on the SiO_(2)wires to form a dendritic micro/nano structure.The dendritic SiO_(2)powder was then added to a homemade novel polyurethane(PU)with urea and amide bonds in the branched chain,and its effect on the hydrophobicity,transmittance,and mechanical properties of the polyurethane film was studied and compared with the spherical and linear SiO_(2)powders.The results showed that the dendritic SiO_(2)powder had an improved compatibility with the resin and could be well dispersed in it.The PU film prepared with 3%of the dendritic SiO_(2)powder had a transmittance of 90.99%,a tensile strength of 8.4 MPa which was 3.1 MPa higher than that of the pure PU film.The thermal stability,water resistance,and hydrophobicity of PU film and its adhesion to glass were improved by modification with the dendritic SiO_(2)powder.The pencil hardness of the said 3%dendritic SiO_(2)-modified PU film reached 6H,and its wear rate was as low as 6.1 cm^(3)/(N·m).
作者
王海潮
姚伯龙
WANG Haichao;YAO Bolong(School of Chemistry and Material Engineering,Jiangnan University,Wuxi 214122,China;Functional Coatings Laboratory,Wuxi 214122,China)
出处
《电镀与涂饰》
CAS
北大核心
2022年第10期735-742,共8页
Electroplating & Finishing
关键词
聚氨酯
改性
二氧化硅
微纳结构
透明
耐磨性
疏水性
polyurethane
modification
silica
micro/nano structure
transparency
wear resistance
hydrophobicity
