Effect Mechanism of Gelatin-alum Solution on Paper Durability
Gelatin-alum solution plays a significant role in reinforcing ink and pigment,improving paper hydrophobicity,and enhancing ink embellish.It is widely used in painting,mounting,and restoration.However,the acidification problem of paper caused by gelatin-alum solution poses a serious challenge to the conservation of paper-based cultural relics such as calligraphies and paintings.To deeply understand the mechanism of how gelatin-alum affecting paper durability,this study selects pure cellulose paper as model paper,and applies gelatin and alum solutions with different concentrations,either individually or in combination,to modify the fiber surface of model paper.After accelerated aging,variations in paper properties are analyzed in terms of acidity,content of reducing carbonyl groups,fiber morphology,and chromaticity.By comparing the pH values and the content of reducing carbonyl groups of papers treated with various concentrations of gelatin-alum solution,it is found that under wet-heat condition,the concentration of alum in solution is the primary factor that affects paper acidification and cellulose degradation.By analysis of the content of reducing carbonyl groups in papers treated with gelatin,alum,and gelatin-alum solution,it reveals that gelatin can mitigate the ability of alum to degrade cellulose,thereby slow down the rate of paper acidification.Since gelatin tends to yellow significantly after accelerated aging,the amount of gelatin in the paper primarily dictates the change of paper chromaticity.This research deepens the understanding of the degradation mechanism of gelatin-alum treated paper,which provides theoretical support for the application of gelatin-alum solution in the preservation of paper-based cultural relics.
gelatin-alum solutionpaper degradationdurabilityconservation of paper-based cultural relics
万方数据
维普
