纤维性能对纸张水蒸气阻隔性能的影响

本研究利用不同种类、不同程度打浆处理及硅烷化改性的纸浆纤维，制备物化性能不同的纸张，调控纸张的三维孔隙结构，从纤维的物理性能和化学疏水改性对纸张结构影响的角度，探讨纤维性能（打浆度、纤维长度及分布、保水值、纤维形貌和亲/疏水性等）对纸张水蒸气阻隔性能的影响。结果表明，纸张的水蒸气阻隔性能受纤维打浆度和亲/疏水性的影响较大。测试条件(23±0.5) ℃、相对湿度(50±1)%时，打浆度从13.5 °SR增至90 °SR的未漂化学针叶木浆制备的定量60 g/m²纸张的水蒸气透过率从954.5 g/(m²·d)降低至93.77 g/(m²·d)；测试条件为(23±0.5) ℃、相对湿度(75±1)%时，疏水改性纤维纸张比未改性纤维纸张的水蒸气透过率降低了11.6%，纸张的水蒸气透过率受疏水改性纤维配抄比例的影响较大。

Effect of Fiber Properties on Water Vapor Barrier Performance of Paper

In this study， paper with different physicochemical properties were prepared by using different types of pulp fibers with different degrees of pulping treatment and silane modification to regulate the three-dimensional structure of paper. From the viewpoint of the effects of fiber physical properties and chemical hydrophobic modifications on paper structure， the effects of fiber properties （beating degree， fiber length and distribution， water retention value， fiber morphology and hydrophilic/hydrophobic property） on the water vapor barrier performance of paper were investigated. The results showed that the water vapor barrier performance of the paper was influenced by the beating degree and hydrophilic/hydrophobic of the fibers. Under the testing conditions of （23±0.5）℃ and （50±1）%RH， the water vapor transmission rate of the paper with a basis weight of 60 g/m² was reduced from 954.5 to 93.77 g/（m²·d）， when the beating degree of the unbleached pine pulp was increased from 13.5 to 90 °SR. The water vapor transmission rate of the paper prepared by hydrophobic modified fiber was reduced by 11.6% compared with that of unmodified fiber when the test conditions were （23±0.5） ℃ and （75±1）%RH. The water vapor transmission rate of paper was influenced by the mixing proportion of hydrophobic modified fiber.