Suitable Methoxysilane and Its Oligomer for Tensile Strength Improvement in Treated Paper Using Titanium Butoxide as Reaction Accelerator

O. Yagi, Kazumi Suzuki, Tomokuni Onoe, F. Ohishi
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Abstract

For investigating the suitable methoxysilane and its oligomer for improving the tensile strength of treated paper after its hydrolysis and poly-condensation, three methoxysilanes (tetramethoxysilane (TMOS) , methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane) and two oligomers (TMOS and MTMS oligomers) were impregnated into the base paper using titanium butoxide as the reaction accelerator. Among the three methoxysilanes, the highest impregnated weight (7.2 g/m 2 ) was obtained when a TMOS solution was used. The highest tensile strength was obtained when an MTMS solution was treated (4.3 kN/m, 130 % increase compared to the base paper). On the other hand, for the two oligomers, the highest weight was 50 g/m 2 and the highest strength was 6.8 kN/m (200 % increase) when an MTMS oligomer solution was treated. These differences in the improvement of the weight and strength between the monomer solutions and the oligomer ones were due to the monomer's high volatility. The reason why the MTMS oligomer produced the highest strength treated paper is attributed to its molecular characteristics. Because the MTMS has one unhydrolyzable group (methyl group) and three hydrolyzable groups (methoxy groups), it is assumed that the balance between the flexibility resulting from the methyl group and the hardness from the methoxy groups produced the moderate tension in the generated polymer. The MTMS oligomer has the same balance as the MTMS. Among the MTMS oligomers having different degrees (n = 3.1, 4.4, 6.3, 8.7, 12.4 and 26.1 ) , there was only a slight difference in strength. The most suitable methoxysilane compound for improvement of the tensile strength was the MTMS oligomer.
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甲氧基硅烷及其低聚物以丁氧钛为反应促进剂提高纸张抗拉强度
为了研究甲氧基硅烷及其低聚物在水解缩聚后对提高处理纸抗拉强度的作用,以丁氧化钛为促进剂,将三种甲氧基硅烷(四甲基氧基硅烷(TMOS)、甲基三甲氧基硅烷(MTMS)和二甲基二甲氧基硅烷)和两种低聚物(TMOS和MTMS低聚物)浸渍在原纸中。三种甲氧基硅烷中,TMOS溶液的浸渍质量最高,为7.2 g/ m2。MTMS溶液处理后的抗拉强度最高(4.3 kN/m,比原纸提高130%)。另一方面,两种低聚物在处理MTMS低聚物溶液时,最高质量为50 g/ m2,最高强度为6.8 kN/m(提高200%)。单体溶液和低聚物溶液在重量和强度改善方面的差异是由于单体的高挥发性。MTMS低聚物产生高强度处理纸的原因在于其分子特性。由于MTMS具有1个不可水解基团(甲基)和3个可水解基团(甲氧基),因此可以假设甲基产生的柔韧性和甲氧基产生的硬度之间的平衡产生了生成的聚合物中适度的张力。MTMS低聚物与MTMS具有相同的平衡。不同程度MTMS寡聚物(n = 3.1、4.4、6.3、8.7、12.4和26.1)的强度差异不大。MTMS低聚物是最适合提高抗拉强度的甲氧基硅烷化合物。
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