Method for deacidifying paper by using soluble tetraborate as paper deacidifying agent

A technology of tetraborate and deacidification agent, applied in the field of deacidification of ancient paper, paper deacidification, and soluble tetraborate, to achieve good deacidification effect, avoid alkaline hydrolysis, and moderate alkalinity.

Active Publication Date: 2013-03-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, SP in borate 2 The electron-deficient structure makes tetraborate have strong electron-absorbing ability, and it is easy to add polyols to enhance the ability of intermolecular force; in addition, due to the special electron-deficient structure of borides, its compounds have a variety of special properties. It is often used as a modifier in industrial production, but there is no application related to deacidification or strengthening of paper

Method used

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  • Method for deacidifying paper by using soluble tetraborate as paper deacidifying agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take about 130g of the 1989 New York Times newspaper and put it into a container of appropriate size. Mix the saturated sodium tetraborate aqueous solution and ethanol at a room temperature of 25°C in a volume ratio of 80:20. Take 850ml of the alcoholic aqueous solution and soak Treat for 40 minutes to neutralize the acidic substances in the paper. The pH of the paper after deacidification is 8.46; the tensile strength is 1.82, which is 5.8% higher than that before deacidification; the elongation is 1.39, which is 59.8% higher than that before deacidification; the tearing degree is 146.8, which is higher than that before deacidification 20.3%; the folding strength is 7, which is 40% higher than that before deacidification. After aging, the pH and strength remain good, and the deacidification effect is good.

[0039] pH tensile strength Elongation% Tear degree mN Folding Endurance After deacidification 8.46 1.82 1.39 146.8 7 after agi...

Embodiment 2

[0041] Take about 207g of New York Times newspaper in 1989, put it into a container of appropriate size, and mix tetraborate (sodium tetraborate, potassium tetraborate, calcium tetraborate, etc.) saturated aqueous solution with ethanol according to the volume ratio Mix evenly at a ratio of 80:20, take 1200ml of alcohol water solution, soak for 40min, and neutralize the acidic substances in the paper. Take the deacidification agents listed in the table below, mix them with ethanol according to the same solvent volume ratio, and use the same conditions to treat the same amount of paper as a reference. From the comparison of deacidification results, it can be seen that the deacidification effect using borate is significantly better than other types of deacidification agents listed in the table below. After aging at 105℃ for 72 small tests, the strength remains good.

[0042] Na 2 B 4 o 7 K 2 B 4 o 7 CaB 4 o 7 CaCO 3 Ca(C 2 h 5 COO) 2 Ca(O...

Embodiment 3

[0044] Take about 110g of New York Times newspaper in 1989, put it into a container of appropriate size, and mix the saturated aqueous solution of sodium tetraborate, aqueous solution of potassium tetraborate and ethanol at a room temperature of 25°C in a ratio of 25:25:50 by volume. , take 950ml of alcohol aqueous solution, soak for 40min, and neutralize the acidic substances in the paper. The pH of the paper after deacidification is 8.24; the tensile strength is 1.99, which is 15.7% higher than that before deacidification; the elongation is 1.21, which is 68.1% higher than that before deacidification; the tearing degree is 142.0, which is higher than that before deacidification 16.4%; the folding strength is 8, which is 60% higher than that before deacidification. After aging, the pH and strength remain good, and the deacidification effect is good.

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Abstract

The invention discloses a method for deacidifying paper by using soluble tetraborate as paper deacidifying agent. Tetraborate aqueous solution with different concentrations and organic solvents in different types are mixed together; paper, especially acidified and aged paper, is deacidified by adopting a plurality of modes such as immersion, spraying, atomization or supercritical treatment; the soluble tetraborate serving as the paper deacidifying agent for deacidifying the paper can control the pH value of the paper within an ideal range, and diffusion of ink marks and color change of the paper can be avoided in the deacidifying process; furthermore, all the mechanical strengths of the paper are enhanced during deacidifying; the tetraborate has a certain function of restraining microorganisms; therefore, after the paper is treated by the tetraborate solution, the durability of the paper is improved obviously.

Description

technical field [0001] The invention relates to a method for using soluble tetraborate to deacidify paper, such as ancient book paper; in particular, it relates to a method for using soluble tetraborate as a paper deacidifier for paper deacidification. Background technique [0002] Chinese culture has a long history and is dazzling. It is estimated that there are as many as 80,000 kinds of Chinese ancient books and documents since the "Oracle Bone Inscriptions" were recorded. "Ancient books" is the abbreviation of ancient Chinese books, the main carrier and representation of human material civilization and culture, and a rich historical and cultural heritage left to us by the splendid civilization history of the Chinese nation for 5,000 years. However, many precious ancient books are damaged to varying degrees due to the age, wars and funerals, water and fire invasion, rat gnawing and moth erosion, and environmental deterioration, and most of the ancient books are damaged t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H25/18
Inventor 王彦娟方岩雄谭伟刘春英郑俊霞
Owner GUANGDONG UNIV OF TECH
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