The aim of this work was to study mechanical properties of two types of papers impregnated with melamine formaldehyde(MF)/urea formaldehyde(UF)/nanosilica nanocomposite coatings. A full factorial experimental design was used to study the effects of the type of paper (mechanical or Kraft), nanosilica content (0,2,4%) and UF:MF weight ratio (60:40, 75:25 and 90:10) on the mechanical properties of the coated papers. The tensile index (TI), breaking length (BL) and tear index (Tin) of the mechanical papers were not affected significantly by addition of nanosilica to the resin while the Kraft paper was more responsive to nanosilica and showed higher mechanical properties. Kraft paper coated with UF:MF 60:40 resin containing 4% nanosilica showed the highest TI, BL and Tin in machine direction among the samples. The microstructure of the mechanical and Kraft papers impregnated with this nanocomposite coating was further characterized by FTIR, XRD, SEM/EDX and AFM. FTIR spectra proved the formation of chemical bonds between the resin and nanosilica in Kraft paper. SEM/EDX and XRD patterns revealed that nanosilica was well dispersed in the nanocomposite coating without any aggregation. The findings of this study suggest that naonsilica can be used as a promising additive for improving the properties of Kraft papers.

这项工作的目的是研究两种类型的纸的机械性能，这些纸浸渍了三聚氰胺甲醛（MF）/脲甲醛（UF）/纳米二氧化硅纳米复合涂料。使用全因子实验设计来研究纸张类型（机械或牛皮纸），纳米二氧化硅含量（0.2％，4％）和UF：MF重量比（60：40、75：25和90:10）的影响）有关涂布纸的机械性能。通过向树脂中添加纳米二氧化硅，机械纸的拉伸指数（TI），断裂长度（BL）和撕裂指数（Tin）不受显着影响，而牛皮纸对纳米二氧化硅的反应更灵敏，并且机械性能更高。在样品中，涂有UF：MF 60:40树脂（含4％纳米二氧化硅）的牛皮纸在机器方向上显示最高的TI，BL和锡。用FTIR，XRD，SEM / EDX和AFM进一步表征了浸渍有该纳米复合涂层的机械纸和牛皮纸的微观结构。FTIR光谱证明了牛皮纸中树脂和纳米二氧化硅之间的化学键形成。SEM / EDX和XRD图谱表明，纳米二氧化硅良好地分散在纳米复合涂层中，没有任何聚集。这项研究的发现表明，纳米二氧化硅可以用作改善牛皮纸性能的有前途的添加剂。