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Ultrasound-assisted method for deacidification of paper

An ultrasonic and deacidification technology, which is applied in the post-treatment of waste paper, can solve the problems of long soaking deacidification time and uneven deacidification, and achieve the effect of enhancing mechanical properties, improving mechanical properties and extending storage life

Inactive Publication Date: 2013-06-12
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention utilizes the advantages of ultrasonic waves in the liquid phase to produce cavitation effects, turbulent effects, and perturbation effects, and accelerates the reaction and homogenization of the acidic substances in the deacidification agent and paper to overcome the immersion in the existing liquid phase deacidification method. The deacidification time is relatively long and the defects of uneven deacidification; at the same time, the mechanical properties of the paper are further improved

Method used

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  • Ultrasound-assisted method for deacidification of paper

Examples

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Effect test

Embodiment 1

[0029] Take about 30g of the 1952 newspaper ("World Journal") into a container of appropriate size, put it into an ultrasonic tank filled with 800mL calcium hydroxide saturated aqueous solution for soaking (20min) or ultrasonic treatment. Ultrasonic treatment operation: ultrasonic treatment for 10 minutes at room temperature of 25° C., ultrasonic power of 100 W, frequency of 40 Hz. After ultrasonic deacidification, the pH of the paper is 8.33; the tensile strength is 1.107kN / m, and the elongation is 0.72%, which are respectively increased by 3.62% and 14.28% compared with 20min immersion deacidification; The deacidification effect remained the same. After aging, the pH and strength decreased slightly, but the pH remained in the optimum range of 7.0-8.5, and the deacidification effect was good.

[0030] The results are shown in the table below:

[0031]

Embodiment 2

[0033] Take about 20g of the 1952 newspaper ("World Journal") into a container of appropriate size, put it into an ultrasonic tank filled with 800mL of 0.2% calcium hydroxide aqueous solution for immersion (30min) or ultrasonic treatment. Ultrasonic treatment operation: ultrasonic treatment for 20 minutes at a room temperature of 25° C., ultrasonic power 80 W, frequency 40 Hz. After ultrasonic deacidification, the pH of the paper is 8.35; the tensile strength is 1.330kN / m, and the elongation is 0.79%, which are respectively increased by 16.06% and 12.86% compared with 30min immersion deacidification; The deacidification effect remained the same. After aging, the pH and strength decreased slightly, but the pH remained in the optimum range of 7.0-8.5, and the deacidification effect was good.

example 3

[0035] Take about 35g of the 1951 newspaper ("World Journal") into a container of appropriate size, put it into an ultrasonic tank filled with 800mL of 0.2% calcium hydroxide aqueous solution for immersion (40min) or ultrasonic treatment. Ultrasonic treatment operation: ultrasonic treatment for 20 minutes at a room temperature of 25° C., ultrasonic power of 50 W, and frequency of 40 Hz. The pH of the paper after ultrasonic deacidification is 8.19; the tensile strength is 1.081kN / m, and the elongation is 0.72%, which are respectively increased by 1.12% and 14.29% compared with 40min soaking deacidification; Soaking deacidification effect remained the same. After aging, the pH and strength decreased slightly, but the pH remained in the optimum range of 7.0-8.5, and the deacidification effect was good.

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Abstract

The invention discloses a method for deacidification of paper by using an ultrasound-assisted deacidification agent. The method comprises the following steps of: putting paper, especially aged and acidulated paper into an ultrasonic treatment device, and treating the paper by using an aqueous solution of a deacidification agent (such as calcium hydroxide, borax or magnesium acetate and the like), a fatty alcohol solution or a mixed solution of fatty alcohol and water. By adopting the method, the pH value of the paper is controlled in the optimum range of 7.0-8.5; compared with soaking deacidification, the deacidification time is obviously shortened, and the deacidification is uniform; and meanwhile, the strength of the paper is obviously improved, and the mechanical strength of each item is greatly improved, so that the storage life of the paper is favorably prolonged.

Description

technical field [0001] The invention relates to a method for deacidifying paper by using an ultrasonic assisted deacidifier, in particular to a method for deacidifying ancient books by using an ultrasonic assisted deacidifier. Background technique [0002] my country is an ancient civilization with a long history and splendid culture. In the long years, a large number of precious historical archives and cultural books have been formed, which record the historical footprints of the Chinese nation and the life course of Chinese sons and daughters who struggled endlessly. These cultural treasures left behind are the spiritual backbone of the Chinese nation standing tall in the world. But now, these precious historical and cultural materials, especially modern literature and books, are facing severe challenges. [0003] According to the survey, more than 60% of modern documents and books in most libraries and archives in our country are seriously acidified. A large number of ...

Claims

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Application Information

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IPC IPC(8): D21H25/18
Inventor 谭伟程丽芬方岩雄黄宝华张焜
Owner GUANGDONG UNIV OF TECH
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