| The literature of the Republic of China refers to various paper publications,manuscripts and letters published from 1912 to September 1949,which are not only important historical documents but also literary and artistic treasures that carry information of the times.With the passage of time,most of the literature of the Republic of China appeared disease characteristics such as embrittlement and acidification,and thus gradually lost the most basic functions of document archives.In order to improve the physical performance of the literature paper,alleviate the acidification and aging process,and effectively extend the life of the literature,reinforcement and deacidification of the literature has become the key to protecting the paper literature of the Republic of China.As a cellulose derivative,carboxymethylcellulose sodium has been widely adopted in the papermaking industry and the restoration of ancient books,but it has not been well developed as a document protection material.Therefore,in this thesis,the paper literature of the Republic of China as research sample,carboxymethylcellulose sodium is employed as the main reinforcement and deacidification material,and sodium tetraborate is employed as the deacidification accessory ingredient to prepare carboxymethylcellulose sodium reinforcing agent to protect the aging Republic of China literature.The experiment is committed to finding a way to protect the paper literature of the Republic of China that can reinforce and deacidify the literature at one time,effectively improve the physical performance of the literature,and enhance the ability of paper to resist aging and acidification.In order to prove the effectiveness of carboxymethylcellulose sodium reinforcing agent for the protection of paper documents such as the paper literature of the Republic of China,the following work has been mainly carried out.Firstly,before and after the initial reinforcement,the morphological characteristics of the literature paper has been observed and performance of it has been tested.Preliminary screening of the reinforcing agent has been carried out by orthogonal experiment,and it has been determined that the optimal conditions of the carboxymethylcellulose sodium reinforcing agent has been the processing temperature of 10℃,the carboxymethylcellulose sodium concentration of 1.5%,and the processing time of 30 minutes.Secondly,in order to improve the acidification resistance of the carboxymethylcellulose sodium reinforcing agent and its filling effect on the internal pores of the literature paper,0.5%sodium tetraborate has been introduced as a deacidification accessory ingredient to optimize the reinforcing agent during the experiment.The optimized carboxymethylcellulose sodium reinforcing agent is able to greatly increase the pH value of the literature paper while reducing the porosity of the paper,so as to keep the paper in a weak alkaline state,that is pH value is above 7,for a long time,and improve the anti-acidification ability of the literature.Finally,to test the anti-aging ability of carboxymethylcellulose sodium reinforcing agent,artificial accelerated aging experiments have been performed on paper samples of the literature before and after reinforcement,meanwhile,the paper fiber characterization and paper performance have been compared and tested.The experimental data shows that carboxymethylcellulose sodium reinforcing agent not only has a good reinforcement and deacidification effect,but also is able to maintain this effect for a long period of time.In summary,due to the simple preparation of carboxymethylcellulose sodium reinforcing agent,the convenient operation,the low requirement on experimental sites,carboxymethylcellulose sodium reinforcing agent is suitable for processing a large amount of Republic of China literature;with features of low raw material cost is low,and good cleaning effect is good,this colorless reinforcing agent is able to enhance all aspects of paper performance,and thus it is reinforcing agent suitable for the paper literature of the Republic of China. |
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