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Method for deacidifying and enhancing acidified and aged paper documents by sodium silicate or borax and polyamide epichlorohydrin complex

A technology of epichlorohydrin and sodium silicate, applied in chemical/biochemical treatment of paper, papermaking, paper coating, etc., can solve problems such as low pH value, increased paper strength performance, and poor strength

Pending Publication Date: 2019-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention aims to solve the problem of low pH value and poor strength of acidified aging paper documents, and provides a compound of sodium silicate or borax and PAE, which can not only neutralize the acidic substances in the paper, but also increase the pH value of the paper , and can significantly increase the strength properties of paper

Method used

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  • Method for deacidifying and enhancing acidified and aged paper documents by sodium silicate or borax and polyamide epichlorohydrin complex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve or dilute borax and PAE separately using deionized water to a concentration of 2 wt % solution (magnetic stirring 5 ~ 30min), according to the borax and PAE effective component mass ratio is 2:1 preparation composite solution, and it is placed in the watering can, evenly sprayed on acidified and aged paper documents (paper pH is 4.73 , whiteness is 39.5%, tensile index is 16.92N·m / g) surface, dosage is 2.5g / m 2 . After treatment, the treated paper is naturally aired at room temperature until the surface has no obvious wet state, then placed in an oven, heated at 50°C for 20 minutes, compared with untreated paper, the pH of the paper is 7.45, and the tensile index is 19.95N m / g (increased by 17.9%), there is no change in the text and graphics on the surface of the book, and the whiteness of the paper is slightly improved.

Embodiment 2

[0034] Dissolve or dilute borax and PAE separately using deionized water to a concentration of 2 wt% solution (magnetic stirring 5 ~ 30min), according to the borax and PAE effective component mass ratio is 3:2 preparation composite solution, and it is placed in the watering can, evenly sprayed on acidified and aged paper documents (paper pH is 4.73 , whiteness is 39.5%, tensile index is 16.92N·m / g) surface, dosage is 3.0g / m 2 . After treatment, the treated paper is naturally aired at room temperature until the surface has no obvious wet state, then placed in an oven, heated at 60°C for 20 minutes, compared with untreated paper, the pH of the paper is 7.02, and the tensile index is 20.78N ·m / g (increased by 28.7%), the text on the surface of the book does not change, and the whiteness of the paper is slightly improved.

Embodiment 3

[0036] Dissolve or dilute borax and PAE separately using deionized water to a concentration of 2 wt % solution (magnetic stirring 5~30min), according to the mass ratio of borax and PAE effective component is 1:1 preparation composite solution, and it is placed in the watering can, evenly sprayed on the acidified and aged paper document (paper pH is 4.73 , whiteness is 39.5%, tensile index is 16.92N·m / g) surface, dosage is 4.0g / m 2 . After treatment, the treated paper is naturally aired at room temperature until the surface has no obvious wet state, then placed in an oven, and heated at 60°C for 30 minutes. Compared with untreated paper, the pH of the paper is 7.10, and the tensile index is 23.47N m / g (increased by 38.7%), the text on the surface of the book has no change, and the whiteness of the paper has basically remained the same.

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Abstract

The invention discloses a method for deacidifying and enhancing acidified and aged paper documents by a sodium silicate or borax and polyamide epichlorohydrin complex. The preparation method specifically comprises the following steps: preparing sodium silicate or borax into a solution with the mass percent concentration of 0.5-5%; mixing the sodium silicate or borax solution with polyamide epichlorohydrin to obtain a sodium silicate or borax and polyamide epichlorohydrin complex; diluting a complex solution, and uniformly spraying the diluted complex solution on the surface of the acidified and aged paper in a spraying form; and naturally airing the treated paper at room temperature until the surface has no obvious wet state, putting the paper into a drying oven, and heating at the temperature of 50-70 DEG C for 15-30 min, thereby completing the deacidification enhancement treatment of the acidified and aged paper. According to the method, acidic substances in the paper can be neutralized, the pH value of the paper can be increased, and the strength performance of the paper can be remarkably improved. Meanwhile, ink writing of paper documents is not affected, and the implementationprocess is simple and convenient.

Description

technical field [0001] The invention relates to a method for deacidifying and strengthening acidified aging paper documents, in particular to a method for deacidifying and strengthening acidified and aged paper documents by using a compound of sodium silicate or borax and polyamide epichlorohydrin (PAE). [0002] technical background [0003] Paper documents are the carrier of excellent culture and occupy an indispensable position in the spread of human civilization. However, due to the scouring of the times and changes in the environment, these paper documents are gradually acidified and aged, mainly manifested in the reduction of the pH of the paper, yellowing, brittleness, crushing and damage of the paper. In order to preserve the inheritance of human history and civilization, it is urgent to protect the acidified and aged paper. [0004] The internal causes of paper aging are mainly cellulose degradation (hydrolysis) and oxidation reactions. The cellulose oxidation reac...

Claims

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Application Information

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IPC IPC(8): D21H25/18D21H25/02D21H19/14D21H19/30
CPCD21H19/14D21H19/30D21H25/02D21H25/18
Inventor 张宏伟翟鹏臣王钦雯唐爱民
Owner SOUTH CHINA UNIV OF TECH
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