Ganicz Tomasz, Rozga-Wijas Krystyna
Center of Papermaking and Printing, Lodz University of Technology, 90-924 Lodz, Poland.
Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90-363 Lodz, Poland.
Materials (Basel). 2021 Aug 31;14(17):4977. doi: 10.3390/ma14174977.
The results of the application of a new hydrophobization agent based on a triethoxymethylsilane and standard starch aqueous mixture for mass-produced cellulosic materials-printing paper, paperboard, and sack paper-have been evaluated to examine whether such a mixture can be used in industrial practice. The application of this agent on laboratory sheets prepared in a repetitive recycling process was performed to investigate its influence on the formation and properties of the products, as well as the contamination of circulating water. Measurements of the water contact angle, Cobb tests, and water penetration dynamics (PDA) were performed to test the barrier properties of the resulting materials. The effects of the applied coatings and recycling process on the paper's tensile strength, tear index, roughness, air permeance, and ISO brightness were studied. Studies have proven that this formulation imparts relatively high surface hydrophobicity to all materials tested (contact angles above 100°) and a significant improvement in barrier properties while maintaining good mechanical and optical performance. The agent also does not interfere with the pulping and re-forming processes during recycling and increases circulation water contamination to an acceptable degree. Attenuated total reflectance Fourier-transform infrared (FT-IR) spectra of the paper samples revealed the presence of a polysiloxane network on the surface.
已对一种基于三乙氧基甲基硅烷和标准淀粉水溶液混合物的新型疏水化剂应用于大规模生产的纤维素材料（印刷纸、纸板和麻袋纸）的效果进行了评估，以检验这种混合物是否可用于工业实践。在重复回收过程中制备的实验室纸张上应用该试剂，以研究其对产品形成和性能以及循环水污染的影响。进行了水接触角测量、科布试验和水渗透动力学（PDA）测试，以测试所得材料的阻隔性能。研究了所应用的涂层和回收过程对纸张拉伸强度、撕裂指数、粗糙度、透气度和ISO亮度的影响。研究证明，这种配方赋予所有测试材料相对较高的表面疏水性（接触角高于100°），并显著改善阻隔性能，同时保持良好的机械和光学性能。该试剂在回收过程中也不干扰制浆和再成型过程，并将循环水污染增加到可接受的程度。纸张样品的衰减全反射傅里叶变换红外（FT-IR）光谱显示表面存在聚硅氧烷网络。
