| With the birth of the ancient Chinese civilization,papermaking came into being.Since then,it has opened the epoch-making door of graphic carriers.Since the Western Han Dynasty,paper has become the main carrier of writing,recording political,cultural,economic,scientific and technological information in specific periods of the past.These valuable paper relics are the crystallizations of the wisdom of the Chinese nation,the miniatures of the endless Chinese civilization,and the irreplaceable sources of historical data.Protect paper-based cultural relics and prevent the loss of civilization,entrusting our own generation with heavy responsibility.However,paper cultural relics are organic materials,and are susceptible to various natural environmental factors and human factors.Consequently,the surviving paper cultural relics have suffered varying degrees of damage and even irreversible qualitative changes.In the process of preservation,high temperature and humidity,acid and alkali corrosion,light oxidation,etc.can accelerate the aging of paper-based cultural relics,and microbial erosion can also seriously reduce the life of paper-based cultural relics.In order to increase the durability of paper cultural relics,this article explores anti-aging and bacteriostasis in the protection of paper cultural relics.The main contents are as follows:1.Reinforcement and fixation of paper cultural relics by natural polymers and their derivativesObjective to develop a paper reinforcing agent with color fixing function.Chitosan,sodium alginate and hydroxyethyl cellulose solution were selected as the research objects to study the strengthening effect and color fixing ability.With gelatin as assistant and alum water as positive control,the effects of three kinds of materials on the tensile force,pH value and color difference of paper cultural relic carrier were studied;the effects of three kinds of materials on the dry heat aging,UV aging,acid resistance,alkali resistance and oxidation resistance of seven kinds of traditional Chinese painting pigments were studied.The comprehensive protection ability of the three materials to the durability of paper carrier and pigment was discussed.The experimental results showed that all three materials can improve the tensile strength of paper and the durability of paper and pigment.Among them,the hydroxyethyl cellulose solution with a mass concentration of 0.9% has the best fixing effect.2.Study on anti-ultraviolet aging effect of nanometer titanium dioxide on calligraphy and painting relicsObjective to develop a compound anti-ultraviolet aging enhancer.Based on the research of the compound fixing agent in the previous chapter,nano-titanium dioxide was selected as the anti-ultraviolet agent,hydroxyethyl cellulose and gelatin as the reinforcing agent and dispersing agent,and chitosan as the antibacterial synergist.On the basis of single-factor research,the response surface methodology was used to optimize the proportion mass ratio of titanium dioxide,chitosan and hydroxyethyl cellulose,and the anti-ultraviolet effect of the optimal composite anti-ultraviolet agent was verified through physical and chemical indicators of paper.The optimal compounding ratio of anti-ultraviolet aging agent was determined as follows: the mass fraction of titanium dioxide was 0.03%,the mass fraction of chitosan was 0.30%,the mass fraction of hydroxyethyl cellulose was 0.50%,the fixation rate was 53.88%,and the model prediction value was 53.99 %,the fixation rate was close to the predicted value of the model.Under this optimized condition,the reduction rates of paper tensile strength and tear index after UV aging were reduced by about 6.93% and 12.22% respectively compared with the blank group,and the bacteriostatic rate was about 40.73%,which can provide a reference for the repair and preventive protection of paper cultural relics.3.Research on application of environmental protection bacteriostatic agent in the protection of paper cultural relicsObjective to screen eco-friendly and efficient compound bacteriostatic agents.Microbial damage is one of the important factors affecting the durability of paper cultural relics.In order to minimize secondary damage to paper cultural relics,nine types of environment-friendly bacteriostatic agents were selected as bacteriostatic materials.By measuring the diameter of the bacteriostatic circle and the minimum bacteriostatic concentration,the bacteriostatic activity of the bacteriostatic agents on common contaminated strains of paper cultural relics was studied,and the effect of the compound bacteriostatic agents on the physical and chemical properties of paper was tested.Considering the preciousness and fragility of paper cultural relics,handmade raw rice paper was used as a simulation sample.The experimental results showed that the selected bacteriostatic agents have a certain degree of inhibitory effect on five kinds of microorganisms.Among them,non-volatile bacteriostatic agents with better comprehensive bacteriostatic ability are pimaricin and PHMB,followed by poly-?-lysine and alliin.The antibacterial effect of chitosan and tea polyphenol in the test concentration range was not obvious.Plant-based volatile antibacterial agents with better comprehensive antibacterial ability are carvacrol and citronellal,followed by 2-phenylethanol.The overall antibacterial effect of citronellal-carvacrol and PHMB-pimaricin compound bacteriostatic agent is good,the bacteriostatic rate reaches 100%,and has no obvious effect on the paper tensile force,the maximum value of ?E does not exceed 1.5,the pH is 7.10~8.85,which are all within the safe range,and can be applied to the antibacterial protection of paper cultural relics. |
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