功能型苯丙乳液在纸质文物保护中的应用研究

Study on Application of Functional Styrene-Acrylic Emulsion in Paper Relic Protection

关键词:  功能苯丙乳液  强度性能  热老化  纸质文物

Key Words:functional styrene-acrylic emulsion  strength property  thermal aging  paper relic

摘要:考察了不同质量分数的自制功能苯丙乳液及复配液对浸涂宣纸抗张强度、耐折度、撕裂度和白度的影响，并用扫描电子显微镜（SEM）进行纸张形貌表征。结果表明，当功能苯丙乳液的质量分数为5%时，苯丙乳液浸涂宣纸的强度性能最佳，宣纸的抗张强度由1.19 kN/m提高到2.43 kN/m，耐折度由18次提高到105次，撕裂度由180 mN提高到251.9 mN；宣纸、静电复印纸、旧报纸和旧书（凸版纸）4种纸张经苯丙乳液浸涂后强度性能均增加，其中宣纸的强度性能增加最显著。苯丙乳液与聚乙烯醇（PVA）的复配液、苯丙乳液与羧甲基纤维素（CMC）的复配液均能增强宣纸的强度性能；加热老化实验后宣纸强度性能也表现较好。

Abstract:Functional styrene-acrylic emulsion not only has excellent properties，but also contains hydroxyl groups on the side chains of polymer molecules，it is of great significance to be used for the protection of paper relics.In this paper， in order to study the effect of styrene-acrylic emulsion in the achives protection，attempted to use functional phenyl emulsion and compound solution for the protection of paper relics.The effects of the emulsions and compound solutions with different mass concentration on the tensile strength， folding endurance， tearing resistance， gloss and whiteness of the papers were investigated，and the paper morphology was characterized by SEM. It was found that the emulsion with 5% concentration was the best， after impregnation with the emulsion， the tensile strength of paper 1（rice paper） was increased from 1.19 kN/m to 2.43 kN/m， and the double folding was increased from 18 to 105， and the tear degree increased from 180 mN to 251.9 mN. The mechanical properties of the three other types of paper including writing paper， old newspaper and old book paper were also significantly increased， and the gloss and brightness had little change. The emulsion containing polyvinyl alcohol（PVA）， or carboxymethyl cellulose（CMC） could enhance the mechanical properties of the paper， and had no effect on the gloss and brightness of the paper. The paper mechanical properties also performed well after the thermal aging test. The principle of the emulsion reinforcing paper was studied by SEM observation. The emulsion was immersed in the paper and coated on the surface of the fiber， the surface of the fiber became smooth and the fiber diameter was increased; the fibers were cross-linked， and a film was formed on the surface of the paper．