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Deacidification liquid having paper strengthening effect and preparation method thereof

A technology of enhancement and deacidification, applied in the post-processing of waste paper, etc., can solve the problems of reduced paper strength, difficulty in drying, safety restrictions, etc., and achieve the effect of mild nature and no damage to handwriting and color.

Active Publication Date: 2017-08-04
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patents 201110212874.X, 201310259350.5, and 201410257846.3 belong to the category of aqueous solutions, which use alkaline substances such as hydroxides, tetraborates, and potassium methyl silicate to be added to the aqueous solution to achieve a certain deacidification effect; but this type of deacidification Easy to cause paper deformation and difficult to dry
There are few pure organic system deacidification agents in Chinese patents, most of which are aqueous solutions of organic alcohols, such as Chinese patent 201310259350.5, which discloses a deacidification solution of trishydroxymethylaminomethane in ethanol aqueous solution; there are also patents that use all-organic solvent systems, such as Chinese patent 201510416162.8 discloses a perfluorooctane solution of nano-magnesia for deacidification of paper documents. These organic deacidification agents are either difficult to recycle, or have limited safety, or are not environmentally friendly, and each has its own advantages and disadvantages.
However, it should also be noted that cellulose is also prone to alkaline hydrolysis in a highly alkaline environment, resulting in a significant reduction in paper strength
Some of the aforementioned patents used highly alkaline inorganic substances in the preparation of the deacidifying agent, which would easily lead to a reduction in the strength of the paper after alkaline hydrolysis; although some used organic reagents that had little effect on the shape of the paper, the paper’s Some bonding components are easy to lose, which will also lead to a decrease in the strength of the paper

Method used

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  • Deacidification liquid having paper strengthening effect and preparation method thereof
  • Deacidification liquid having paper strengthening effect and preparation method thereof
  • Deacidification liquid having paper strengthening effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Composition of deacidification solution: Mg 2 Al-LDHs (structural formula is [Mg 4 al 2 (OH) 12 ](CO 3 )·4H 2 O), the non-ionic surfactant nonylphenol polyoxyethylene ether, the paper strengthening agent is chlorine-modified starch, and the solvent is perchlorethylene.

[0028] Preparation of deacidification solution: 0.34g of Mg with a diameter of 50nm 2 Al-LDHs, 0.2g modified starch, 0.17g nonylphenol polyoxyethylene ether and 250g perchlorethylene were mixed and ultrasonicated for 0.5h.

[0029] Process and effect of paper deacidification treatment: Take 20 sheets of acidified paper and fully soak them in the deacidification solution. After soaking for 0.5h, take out the papers and let them dry naturally in the air. Weigh 2g of dried paper and acidified untreated paper, soak them in a beaker filled with 100mL of distilled water (pH=6.3), shake once in the middle, take out the paper after 1h, and measure the pH value of the soaking solution. Two repetitions wer...

Embodiment 2

[0033] Composition of deacidification solution: Mg 4 Al-LDHs (structural formula is [Mg 8 al 2 (OH) 20 ](CO 3 )·4H 2 O), the surfactant sodium dodecylbenzene sulfonate, the paper strengthening agent is chlorine-modified starch, and the solvent is trichlorotrifluoroethane.

[0034] Preparation of deacidification solution: 0.1g of Mg with a diameter of 100nm 4 Al-LDHs, 0.17g sodium dodecylbenzenesulfonate, 0.5g sodium methyl silicate and 250g trichlorotrifluoroethane were mixed, and mechanically ground for 1 hour.

[0035] Process and effect of paper deacidification treatment: Take 20 sheets of acidified paper and fully soak them in the deacidification solution. After soaking for 0.5h, take out the papers and let them dry naturally in the air. Weigh 2g of dried paper and acidified untreated paper, soak them in a beaker filled with 100mL of distilled water (pH=6.3), shake once in the middle, take out the paper after 1h, and measure the pH value of the soaking solution. Two...

Embodiment 3

[0039] Composition of deacidification solution: Mg 10 Al-LDHs (structural formula is [Mg20 al 2 (OH) 44 ](CO 3 )·4H 2 O), the surfactant sodium polyacrylate, the paper strengthening agent is a fluorocarbon-based modified cellulose, and the solvent is 1-fluoro-6-chlorohexane.

[0040] Preparation of deacidification solution: 0.6g of Mg with a diameter of 500nm 10 Al-LDHs, 0.3g of modified cellulose and 0.09g of sodium polyacrylate were mixed with 250g of 1-fluoro-6-chlorohexane, and stirred and mixed by a high-speed disperser for 3 hours.

[0041] Process and effect of paper deacidification treatment: Take 20 sheets of acidified paper and fully soak them in the deacidification solution. After soaking for 0.5h, take out the paper,

[0042] And let it dry naturally in the air. Weigh 2g of dried paper and acidified untreated paper, soak them in a beaker filled with 100mL distilled water (pH=6.3), shake once in the middle, take out the paper after 1h, and measure the pH value...

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Abstract

The invention belongs to the technical field of ancient books and paper deacidification and discloses a deacidification liquid having paper strengthening effect and a preparation method thereof. The deacidification liquid is composed of 0.01-1wt% of magnesium-aluminum bimetal hydroxide and a roasting product thereof, 0.001-1wt% of surfactant, 0.001-1% of paper strengthening agent and halohydrocarbon with purity of 98-99.988wt%. Various modes of spraying, soaking or atomizing can be adopted to deacidify and strengthen acidified and aged paper. The deacidification liquid is mild in property, PH value is lower than 12, writing color fading is not caused, paper is reinforced and is safe, environment-friendly and recyclable by deacidification, the PH value of the paper can be controlled within a proper range, and certain alkali retaining amount can be acquired; the paper is free of deformation, adhesion and writing or color change after being acidified, and the objective of prolonging preservation life of ancient books and acidified paper materials can be achieved.

Description

technical field [0001] The invention belongs to the technical field of deacidification of ancient books and paper, and in particular relates to a deacidification liquid with paper strengthening effect and a preparation method thereof. Background technique [0002] As the carrier of writing and printing, paper has always played an important role in recording history, transmitting information, and continuing the essence of culture. However, with the change of papermaking technology, the passage of time and the influence of the external environment, under the joint action of internal and external factors, many paper cultural relics have been seriously acidified, resulting in a series of problems such as worn out, damaged and yellowed paper. There are 30 million ancient books and documents collected by various libraries in our country, about 5% of which are seriously damaged; there is also a considerable proportion of paper ancient books or modern materials that have been acidif...

Claims

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Application Information

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IPC IPC(8): D21H25/18
CPCD21H25/18
Inventor 巩前明刘定松
Owner TSINGHUA UNIV
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