Institute for Preservation and Conservation of Chinese Ancient Books, Fudan University, Shanghai 200433, China.
School of Creative Art and Fashion Design, Huzhou Vocational and Technical College, Huzhou 313000, China.
Molecules. 2023 Sep 25;28(19):6791. doi: 10.3390/molecules28196791.
Invaluable paper relics that embody a rich traditional culture have suffered damage, requiring urgent restoration. In this context, the utilization of soymilk as a sizing agent holds great significance and reverence. This study investigates the use of soymilk as a sizing agent for Xuan paper and evaluates its effects on various properties and the long-term behavior of the paper. The findings reveal that the application of soymilk as a sizing agent for Xuan paper imparts distinct properties, including hydrophobicity, improved mechanical properties, and unique chromaticity. These characteristics-arising from the papillae on the surface of the Xuan paper, the protein folding of the soy protein, and hydrogen-bonding interactions between the soy protein and paper fibers-play a crucial role in shaping the paper's unique attributes. From a physicochemical perspective, the aging process leads to multiple changes in paper properties. These changes include acidification, which refers to a decrease in pH, as well as a decline in mechanical strength, an increase in chromaticity, and a decrease in the degree of polymerization (DP) of the paper. The Ekenstam equation is employed to predict the lifespan of the paper, showing longer lifespans for Sheng Xuan paper and a negative correlation between soymilk concentration and lifespan in soymilk-sized paper. Our work provides valuable insights for the preservation and maintenance of paper, highlighting the potential benefits and challenges of using soymilk for surface sizing.
不可估量的纸质文物蕴含着丰富的传统文化，但它们已经受损，亟待修复。在这种情况下，豆浆作为上浆剂的应用具有重要意义和价值。本研究探讨了豆浆作为宣纸的上浆剂的应用，并评估了其对各种性能和纸张长期行为的影响。研究结果表明，豆浆作为宣纸的上浆剂的应用赋予了纸张独特的性能，包括疏水性、改善的机械性能和独特的色度。这些特性源于宣纸表面的乳头、大豆蛋白的蛋白质折叠以及大豆蛋白和纸纤维之间的氢键相互作用，对塑造纸张的独特属性起着关键作用。从物理化学的角度来看，老化过程导致纸张性能的多种变化。这些变化包括酸化，即 pH 值降低，以及机械强度下降、色度增加和纸张聚合度（DP）降低。Ekenstam 方程用于预测纸张的使用寿命，结果表明生宣纸的使用寿命更长，豆浆浓度与豆浆上浆纸的使用寿命呈负相关。我们的工作为纸张的保存和维护提供了有价值的见解，强调了豆浆作为表面上浆剂的潜在益处和挑战。
