| Since the invention of paper,it has been an important carrier for recording important information and cultures around the world.However,paper documents are damaged to different degrees in the process of preservation,and the paper becomes yelow,mildew,and damaged by pulverization,which threaten the preservation life of paper.Research shows that acidification is the most important cause of paper damage and aging.Due to the imperfection of modern industrial machinery papermaking technology,the acidification situation of modern literature is more severe.Therefore,it is urgent to develop an effective comprehensive deacidification method to increase the usability and preservation life of paper documents。This thesis s is mainly to improve the deacidification effect of the protective solution with nanometer magnesium oxide as the main deacidification agent on mechanical paper,and a kind of deacidification protection solution was prepared for different damaged paper.The specific research contents include the following aspects:(1)In this experiment,nanometer magnesium oxide is selected as the deacidification and OT-75 is used as the wetting dispersant,and assist in ultrasonic and mechanical stirring to prepare the suspension with strong permeability and good dispersion stability,so as to effectively solve the problems of poor solubility,uneven dispersion,and accumulation and settlement of the deacidification.For three books(the first two were published by different publishers at the same times,the last two were published by the same publishers at different times)for processing,the results show that the uniform deacidification,without the problems of large local alkaline,acid pH paper by acid increased to 8.5 ～ 9.0,alkali reserves in accordance with international ISO acid technical standard,has a certain degree of improvement in mechanical strength,total chromatic aberration analysis ?E less than 1.0,no color change..In addition,after 45 days of simulation of dry and hot aging,the performance retention rate was higher than that of the blank group.In the SEM figure,the morphology of celulose remained intact,nano-sized magnesium oxide particles were evenly dispersed among the fibers,and IR showed that the molecular structure of paper was not changed,making it an ideal paper relic deacidification solution.(2)For weak paper with low mechanical strength,with tensile strength value as the division standard,divided into 0.2 ～ 0.4,0.4 ～ 0.6,and 0.6 k N/m above three range,the lower tensile strength value,paper embrittlement is more serious.the strengthening effect of four kinds of reagents,the results show that the strengthening effect of amino silane oligomer optimal,and analyze the different concentrations of reinforcing agent on the properties of the paper,the results showed that: When the mass fraction is 15wt%,the maximum tensile strength increases by 84.7% and the maximum tearing degree by56.6%.There is no improvement effect on the folding resistance.The total chromatic aberration is between 1.6 and 3.0,with slight discoloration.(3)For damage of different paper,compared with acid,individual treatment and reinforcement of liquid acid reinforced composite liquid acid effect and anti-aging effect,the results showed that the liquid acid composite reinforcement effect,the optimal processing paper,pH value can reach above 9.0,alkali reserves can reach 0.8mol/kg,mechanical performance,the most obvious according to the total color difference evaluation standard.The total chromatic aberration is between 1.6 and 3.0,with slight discoloration.After dry heat aging,deacidification reinforcement group paper to maintain the best effect,can improve the paper durability and preservation life. |
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