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A method for deacidifying paper by electrolysis

An electrolysis method and paper technology, applied in waste paper post-processing, printing post-processing, printing, etc., can solve the problems of small processing capacity and low efficiency, achieve fast deacidification speed, reduce paper shrinkage, and accurate pH value Effect

Active Publication Date: 2020-03-31
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, this processing method can usually only be processed in a single sheet, and the processing volume is small each time, and the efficiency is low

Method used

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  • A method for deacidifying paper by electrolysis
  • A method for deacidifying paper by electrolysis
  • A method for deacidifying paper by electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Soak the non-woven mat in an electrolyte solution containing 0.15% calcium hydroxide, and then spread the soaked mat on the graphite electrode plate;

[0039]Spread the single-page paper to be processed (one page of a book printed by Geological Publishing House in 1978; 16K, offset paper printing) on ​​the above pad, press another graphite electrode plate, and place the two Plate clamping;

[0040] Connect the two polar plates to a DC power supply with a DC current of 0.3 ampere for 3 minutes; then cut off the power supply, remove the pad, and let the paper air dry naturally. The situation comparison before and after paper deacidification is shown in Table 1 and figure 1 , figure 1 It is a comparison chart of paper before and after deacidification in Example 1. figure 1 In the middle, the right side is the paper before deacidification, and the left side is the paper after deacidification.

[0041] Table 1 Example 1 Paper Analysis Index Comparison Table Before and Af...

Embodiment 2

[0045] Soak the non-woven mat in an electrolyte solution containing 0.15% calcium hydroxide, and then spread the soaked mat on the graphite electrode plate;

[0046] Lay the paper to be processed (two pages of a book printed by Geological Press in 1978; 16K, offset paper printing) on ​​the above pad, press another graphite electrode plate, and place the two plates Clamp;

[0047] Connect the two polar plates to a DC power supply with a DC current of 0.5 ampere for 5 minutes; then cut off the power supply, remove the pad, and let the paper air dry naturally. See Table 2 for the comparison of paper before and after deacidification:

[0048] Table 2 Example 2 Comparison table of analytical indicators before and after paper deacidification

[0049]

Embodiment 3

[0051] Immerse the non-woven mat in the electrolyte solution containing 0.14% calcium hydroxide, and then spread the soaked mat on the graphite electrode plate;

[0052] Lay the paper to be processed (5 pages of a book printed by Geological Press in 1978; 16K, offset paper printing) on ​​the above pad, press another graphite electrode plate, and place the two plates Clamp;

[0053] Connect the two polar plates to a DC power supply with a DC current of 0.7 amps for 8 minutes; then cut off the power supply, remove the cushion, and let the paper air dry naturally. The situation comparison before and after paper deacidification is shown in Table 3 and image 3 , image 3 It is a comparison chart of paper before and after deacidification in Example 3. image 3 In the middle, the right side is the paper before deacidification, and the left side is the paper after deacidification.

[0054] Table 3 Example 3 Comparison table of analytical indicators before and after paper deacidif...

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Abstract

The invention provides a method for deacidifying paper through an electrolytic method. The method comprises the following steps: S1, enabling the paper to be treated to be in contact with a water absorption pad layer, wherein the water absorption pad layer contains a deacidifying agent electrolyte solution to wet the paper to be treated; S2, placing the wetted paper in S1 and the water absorptionpad layer in contact with the paper between two inert electrode plates, and electrifying direct current for electrolytic neutralization, so as to obtain the deacidified paper. The electrolytic methodis relatively high in deacidifying speed, and can accurately control the pH value and perform deacidifying treatment on a single page, multiple pages and an entire book. According to the method provided by the invention, under the action of the current, basic ions instantly penetrate into the wetted paper to realize deacidification and purification of aged acidic paper within several to dozens ofminutes. The efficiency of the method is greatly improved. The problems of paper shrinkage, deformation, stickiness of the entire book, low efficiency and the like due to a conventional aqueous solution-based deacidifying method can be reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of paper deacidification protection, in particular to the deacidification protection technology of paper cultural relics, archives and books, in particular to an electrolytic method for deacidification of paper. Background technique [0002] The acidity of literature paper is an important factor affecting the preservation life of literature; since people discovered the self-destruct phenomenon of paper in the 19th century, scientists from various countries have been studying the methods and equipment of paper deacidification protection. At present, the commonly used paper deacidification methods in the world mainly include gas phase deacidification method, organic solvent deacidification method and aqueous solution deacidification method. Among them, because the aqueous solution deacidification method is simple and easy to implement, and is more environmentally friendly, there are many researches in the indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H25/18B41M7/00
CPCB41M7/0063D21H25/18
Inventor 秦颍黄桥
Owner UNIV OF SCI & TECH OF CHINA