One-step deacidification method for strengthening paper cultural relics

Abstract

The invention discloses a method for performing deacidification reinforcement on a paper cultural relic by a one-step process. According to the method, a high-deacetylation-degree chitosan isopropanol dispersion solution with the particle size of less than 20 mu m is utilized to perform deacidification reinforcement on the paper cultural relic; and the dispersion solution has favorable penetrating quality, can enable the chitosan to be sufficiently filled in the gaps among the cultural relic fibers, and can generate neutralization reaction with acidic substances in the paper cultural relic, thereby achieving the goal of deacidification. The reaction product between the chitosan and acidic substances can be combined with the paper cellulose, thereby performing the function of reinforcing the paper cultural relic. The chitosan has high deacetylation degree and multiple free amino groups in the molecule, has high bacteriostatic actions, and thus, can prevent the mold on the paper cultural relic from growth. The method is simple to operate and friendly to the environment, and is safe and reliable. The chitosan has similar structure to the paper cellulose, and thus, conforms to the principle of minimum intervention in protection of cultural relics. The paper cultural relic subjected to deacidification reinforcement has a certain alkali retention quantity, thereby being beneficial to the subsequent preservation of the paper cultural relic.

Description

technical field [0001] The invention belongs to the technical field of paper archives protection, and in particular relates to a method for deacidifying and strengthening paper cultural relics archives. Background technique [0002] Among all cultural relic materials, paper cultural relics are relatively short-lived. A paper cultural relic may not exist after being placed for decades or hundreds of years. Compared with other human cultural heritages, paper cultural relics are particularly fragile and vulnerable . Paper cultural relics with a fibrous structure tend to turn yellow and become brittle, and eventually decompose naturally. In addition, paper cultural relics are prone to mold and insects, especially in humid weather, making protection even more difficult. [0003] Acidification is the main reason for the poor durability of paper cultural relics. Some of the acidity in paper is due to long-term deterioration, and some are left over during the manufacturing process....

AI Technical Summary

Problems solved by technology

[0004] At present, the deacidification methods of paper cultural relics mainly include: (1) aqueous solution deacidification method, such as lime water deacidification method, calcium hydroxide and bicarbonate method, magnesium bicarbonate method, etc. Phenomena such as wrinkling and deformation occur, so the aqueous deacidification method is limited in practical application; (2) the organic solution deacidification method mainly contains diolamine, magnesium methanol-methanol, Freon mixed solution, magnesium-titanium bimetallic alcohol salt, methoxymethylmagnesium carbonate, ethoxyethylmagnesium carbonate, methylmagnesium carbonate, methoxymagnesium dimethyl carbonate, ethylmagnesium carbonate, calcium propionate and other deacidifying agents, these drugs are expensive, High toxicity, harmful to human body and environment; (3) Gas-phase deacidification method, taking diethyl zinc method as an example, this method is difficult to introduce reinforcing agent, equipment requirements and investment costs are too high, and there are flammable and explosive security and other issues, it is difficult to widely promote the application

[0005] After the paper relics are deacidified by the above method, they still need to be reinforced. At present, the methods of reinforcement are mainly: (1) Mounting method, brushing with a paste broom, neither too tight nor too loose, is a kind of The traditional reinforcement method is cumbersome to implement; (2) the wire mesh reinforcement method has a complicated process flow, and there are many regulations and requirements for silk threads; (3) the resin method, due to the large molecular weight of the resin, has poor permeability and wettability. The resin liquid is not easy to penetrate into the paper fiber, and it is easy to cause a concentration gradient on the surface and inside of the paper, which will accelerate the aging of the paper; (4) the film adding method has strict requirements on the film and is not easy to operate; (5) the multifunctional protective liquid method requires modification , recombination, the process is more complicated

[0006] The above deacidification and reinforcement methods for paper cultural relics are all unilateral and need to be carried out in two steps, and the operation process is cumbersome

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