纳米SiO2/水性聚氨酯复合液的制备及其在模拟纸质文物保护中的应用

Preparation of Nano-SiO2/Waterborne Polyurethane Complex Coating and Its Application in Simulated Paper Relics Protection

关键词:  纳米SiO₂  水性聚氨酯  抗紫外光老化  增强  手工宣纸

Key Words:nano-SiO₂  waterborne polyurethane  UV aging resistance  strengthening  hand-made xuan paper

摘要:本研究采用原位聚合法，利用纳米SiO₂对水性聚氨酯进行改性，制备了一种可用于纸质文物保护的复合涂布液，并研究了手工宣纸涂布前后的形貌及力学性能，对保护液应用于模拟纸质文物的性能进行了评价。结果表明，具有光触媒作用的纳米SiO₂引入水性聚氨酯中后分散良好，具有纳米粒径，且保护液在全紫外波段有80%左右的紫外线吸收，具有一定的紫外屏蔽效果。当纳米SiO₂的添加量为0.5%时，与原纸相比，保护液涂布宣纸撕裂度提高了204.9%，抗张指数提高了282.7%；且具有良好的抗紫外老化性能。

Abstract:In this study， a complex coating used in paper relics protection was prepared by modified waterborne polyurethane with nano-SiO₂ via in-situ polymerization. The surface appearance and mechanical properties of hand-made xuan paper before and after coating were studied， and the application performance of the coating to the simulated paper relics was characterized. The results showed that the nano-SiO₂ with photocatalyst function introduced into the waterborne polyurethane was good dispersed with nano particle size. Moreover， the coating absorbed about 80% of the UV in the whole UV band， indicating a certain UV shielding effect. When the nano-SiO₂ content was 0.5%， compared with control xuan paper， the tear strength of xuan paper increased 204.9% and the tensile index increased 282.7%， and with a good UV aging resistance.