Method for deacidifying through utilizing soluble tetraborate in supercritical CO2 state

A tetraborate, soluble technology, applied in the direction of waste paper post-processing, etc., to achieve the effect of low viscosity, good heat and mass transfer effect, and improved tear and folding resistance

Active Publication Date: 2014-08-13
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 through utilizing soluble tetraborate in supercritical CO2 state
  • Method for deacidifying through utilizing soluble tetraborate in supercritical CO2 state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take about 126g of New York Times newspaper in 1989 and put it into 2L supercritical CO 2 In the treatment kettle, under the conditions of 25MPa and 36°C, inject 700ml of the deacidification agent potassium tetraborate saturated aqueous solution-ethanol mixed solution (volume ratio 60:40) from the auxiliary pump, and treat for 1.8h, CO 2 The flow rate of the fluid is 0.002t / h. Take the deacidification agent with the same proportion and volume, and use the soaking method to treat the paper of the same quality as a reference. Supercritical CO 2 After treatment, the pH value of the paper is 8.38 (8.45 by soaking method), and the pH is well preserved after aging; the tensile strength of the paper is 2.72 (1.94 by soaking method), which is 58.2% higher than that before deacidification; the elongation is 1.57 (1.94 by soaking method 1.21), 80.4% higher than before deacidification, tearing degree 195.2 (128.0 by immersion method), 60% higher than before deacidification; fold...

Embodiment 2

[0042] Take about 106g of New York Times newspaper in 1989 and put it into 2L supercritical CO 2 In the treatment kettle, under the conditions of 24MPa and 36°C, inject the deacidification agent tetraborate (sodium tetraborate, potassium tetraborate, calcium tetraborate, etc.) saturated aqueous solution-ethanol mixed solution (volume ratio of 50:50) 800ml, treatment 2h, CO 2 The flow rate of the fluid is 0.002t / h. Take the saturated aqueous solution of the deacidification agent listed in the table below, mix it with ethanol according to the same solvent volume ratio, and use the same supercritical condition to treat the paper as a reference. From the comparison of deacidification results, it can be seen that the deacidification effect using borate is significantly better than that obtained in patent 200910039000.1. After aging at 105℃ for 72 small tests, the strength remains good.

[0043] The pH comparison after deacidification is shown in the table below:

[0044] ...

Embodiment 3

[0046] Take about 308g of New York Times newspaper in 1989 and put it into 2L supercritical CO 2 In the treatment kettle, under the conditions of 24MPa and 36°C, inject the deacidification agent from the auxiliary pump, each saturated aqueous solution of sodium tetraborate-ethanol mixed solution (50:50 by volume) 2000ml, treat for 4h, CO 2 The flow rate of the fluid is 0.002t / h. Take the deacidification agent with the same proportion and volume, and use the soaking method to treat the paper of the same quality as a reference. After supercritical treatment, the pH value of the paper is 8.33 (8.21 by soaking method), and the pH is well preserved after aging; the tensile strength of the paper is 2.70 (2.34 by soaking method), which is 56.9% higher than that before deacidification; the elongation is 1.54 (soaked method 1.21), which is 77.0% higher than before deacidification; tearing degree is 194.0 (soaking method 171.2), which is 59.0% higher than before deacidification; foldin...

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Abstract

The invention discloses a method for deacidifying by using soluble tetraborate in a supercritical CO2 state. Paper, especially aged and acidified paper, is placed in a supercritical CO2 treatment device to entrain soluble tetraborate. Alcohol aqueous solution for treatment; not only the pH of the paper is controlled within the optimal range, but also the amount of deacidification agent is reduced; compared with other methods, the strength of paper is significantly improved by entraining soluble tetraborate with supercritical CO2, and various mechanical strengths increased badly.

Description

technical field [0001] The present invention relates to a kind of utilization soluble tetraborate in supercritical CO 2 The method of paper deacidification in the state. Background technique [0002] Human civilization with paper as the carrier has continued from thousands of years ago to the present. The profound culture, wisdom and emotion of the ancestors have been accumulated and passed on to us, becoming a precious cultural and material heritage. As one of the resources for studying ancient history, people, nature and culture, ancient books must not be ignored. Due to the influence of the natural environment, social environment, and man-made destruction, the number of ancient books and documents in existence has become less and less, and some of them have even become orphans. According to statistics, the ancient books and documents collected by various libraries in our country have reached 30 million volumes, and 5% of the ancient books and documents have reached the ...

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
Owner GUANGDONG UNIV OF TECH
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