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A method for repairing paper documents using layer-by-layer self-assembled film technology

A layer-by-layer self-assembly and film-forming technology, which is applied in the chemical field, can solve the problems of low efficiency, failure to improve the mechanical properties of paper, time-consuming and labor-intensive problems, and achieve the improvement of paper strength and folding resistance, and reduce the adhesion of microorganisms. The effect is obvious Effect

Active Publication Date: 2020-01-07
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are all "fixing the symptoms, not the root cause", and cannot really improve the mechanical properties of paper from a chemical point of view.
Moreover, the method of paper reinforcement is time-consuming and laborious, and the efficiency is very low

Method used

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  • A method for repairing paper documents using layer-by-layer self-assembled film technology
  • A method for repairing paper documents using layer-by-layer self-assembled film technology
  • A method for repairing paper documents using layer-by-layer self-assembled film technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1. Repairing paper documents

[0045] Take a piece of 200×280mm acid-made paper (1986) and place it in a 260×320×40mm reactor, using chitosan lactate and carboxymethylcellulose sodium salt aqueous solution alternately at a concentration of 1.0mg / ml Layer by layer self-assembly deposition is performed, and layer-by-layer self-assembly composite film of chitosan and carboxymethyl cellulose is obtained on the surface of the paper to be repaired (the number of self-assembly layers is one layer). The thickness of the composite film is ~70nm, the thickness of the chitosan lactate assembly layer in the self-assembly layer is ~35nm, and the thickness of the carboxymethylcellulose sodium salt assembly layer is ~35nm.

[0046] The comparison of performance parameters before and after repair through a layer of self-assembly is shown in Table 1:

[0047] Table 1 Comparison of performance parameters of paper before and after self-assembly repair

[0048]

[0049] It can be seen fro...

Embodiment 2

[0050] Example 2: Repairing paper documents

[0051] Take a piece of 200×280mm acid-made paper (1986) and place it in a 260×320×40mm reactor. The concentration of both is 1.0mg / ml polysaccharide lactate and carboxymethylcellulose sodium salt aqueous solution alternately. Layer-by-layer self-assembly deposition is performed to obtain a layer-by-layer self-assembled composite film of chitosan and carboxymethyl cellulose (the number of self-assembled layers is two) on the surface of the paper to be repaired. The thickness of the composite film is ~140nm, in each self-assembly layer, the thickness of the chitosan lactate assembly layer is ~70nm, and the thickness of the carboxymethylcellulose sodium salt assembly layer is ~70nm.

[0052] The comparison of performance parameters before and after repair through double-layer self-assembly is shown in Table 2:

[0053] Table 2 Comparison of performance parameters of paper before and after two-layer self-assembly repair

[0054]

[0055] It c...

Embodiment 3

[0056] Example 3: Repairing paper documents

[0057] A piece of 200×280mm Beijing Daily (1978) was cut and placed in a 260×320×40mm reactor. With tetrabutyl titanate as the precursor, ultra-thin paper was deposited on the surface of the paper by the surface sol-gel method. Metal oxide Ti0 2 Gel film (the film thickness is 20-50nm), the specific operation is as follows: Dissolve 13.6ml (0.1mol / L) tetrabutyl titanate in 400ml isopropanol solution, and control the vacuum to make 200ml of the solution Slowly pass through the sample of the paper to be repaired, and keep the remaining 200 ml of the solution on the paper to be repaired for 3 minutes, and then quickly suction and filter it with a large amount of ethanol to remove the metal alkoxide remaining on the surface of the paper to be repaired. Subsequently, 400 ml of deionized water was added to the surface of the paper to be repaired and left for 3 minutes to hydrolyze the titanium alkoxide and form a gel layer, and then wash wi...

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Abstract

The invention discloses a method of utilizing a layer-by-layer self-assembly film forming technology to repair paper documents. According to the method, a layer-by-layer self-assembly film forming technology is utilized to form a film on the surface of paper to be repaired so as to repair the paper. Specifically, a water soluble chitosan assembled layer and a sodium carboxymethyl cellulose assembled layer are deposited on the surface of paper to be repaired to obtain a water soluble chitosan-carboxymethyl cellulose layer-by-layer self-assembled composite membrane. For the first time, the layer-by-layer self-assembly film forming technology is used to reinforce and repair paper documents. After reinforcement and repairing, the color and appearance are not changed, the paper strength and folding strength are obviously enhanced, and the hydrophobic property is prominently strengthened. The swelling effect caused by water invasion of cellulose is prevented. The hydrolysis of cellulose is inhibited. The number of microbes adhered on the paper surface is reduced effectively. Moreover, the chitosan layer can inhibit the growth of microbes, and the phenomenon such as paper damage caused byworms, corrosion, and the like, is reduced.

Description

Technical field [0001] The invention belongs to the field of chemistry, and relates to the reinforcement and deacidification of paper archives, in particular to a method for repairing paper documents by using layer-by-layer self-assembly film forming technology. Background technique [0002] Paper cultural relics archives are precious cultural heritage left to us by our ancestors. They are the carrier and witness of Chinese historical inheritance. They have important historical value, artistic value and cultural relic value. The protection of cultural relics is in the contemporary era and will benefit the future. However, the state of ancient books in my country is not optimistic. The few remaining paper-based cultural relics and ancient books and archives are generally damaged by paper aging and acidification, especially the documents since the Republic of China, because they can be preserved to this day. Therefore, better protection of precious documents is an urgent and ardu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/12D21H19/82D21H19/38D21H25/18
Inventor 张小岗江付泽翁佳佳
Owner RENMIN UNIVERSITY OF CHINA
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