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Slow-release hectorite multifunctional alkaline protective agent as well as preparation method and application thereof

A technology of hectorite and protective agent, which is applied in the field of slow-release hectorite multifunctional alkaline protective agent and its preparation, which can solve the problem of pigment fading and discoloration, uncontrollable alkali amount, inability to achieve anti-acidification, reinforcement and enhanced anti-oxidation , antibacterial and other issues, to achieve long-lasting effect, simple synthesis method, good non-toxic and non-irritating effect

Active Publication Date: 2022-06-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used protective agents are mostly alkaline oxides, hydroxides, etc. (such as: MgO, CaO, Mg(OH) 2 , Ca(OH) 2 etc.), these protective agents have been partially used for deacidification protection of paper cultural relics, but because they usually have strong alkalinity, they will bring some adverse effects in the protection of paper cultural relics (such as: paper alkaline hydrolysis, pigment Discoloration, etc.), and the amount of alkali is uncontrollable, requiring the use of organic solvents, and more importantly, the multifunctional integration of anti-acidification, reinforcement, anti-oxidation, antibacterial and other functions cannot be realized

Method used

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  • Slow-release hectorite multifunctional alkaline protective agent as well as preparation method and application thereof
  • Slow-release hectorite multifunctional alkaline protective agent as well as preparation method and application thereof
  • Slow-release hectorite multifunctional alkaline protective agent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Using RD type hectorite, immersed in an ethanol solution containing 3wt% magnesium nitrate, the volume ratio of the solution and hectorite is 20:1, heated in an oil bath, the reaction temperature is 90°C, and the time is 2h. The solid product was isolated by filtration, washed three times with ethanol, and then calcined at 500° C. for 24 hours under an argon atmosphere. The hectorite loaded with 2.5wt% of magnesium species was obtained, and dispersed in water at a mass ratio of 1wt% to prepare a slow-release type hectorite multifunctional protective agent. The paper was pre-cleaned with ear-washing balls to remove surface impurities, and treated by dipping. The mass ratio of the paper to the aqueous solution of the protective agent was 0.7:1, the dipping time was 20 minutes, and the temperature was 25 °C.

[0046] (2) The paper used is the book paper of the Republic of China with the original pH value of 4.56. After 28 days of dry heat aging, the pH value of the anc...

Embodiment 2

[0048] (1) Using RD type hectorite, immersed in an ethanol solution containing 5 wt% magnesium nitrate, the volume ratio of the solution to hectorite is 10:1, heated in an oil bath, the reaction temperature is 80°C, and the time is 3h. The solid product was isolated by filtration, washed three times with ethanol, and then calcined at 500° C. for 24 hours under an argon atmosphere. The hectorite loaded with 4 wt % of magnesium species was obtained, and dispersed in water at a mass ratio of 1 wt % to prepare a slow-release type hectorite multifunctional protective agent. The paper was pre-cleaned with ear-washing balls to remove surface impurities, and treated by dipping. The mass ratio of the paper to the aqueous solution of the protective agent was 1:50, the dipping time was 20 minutes, and the temperature was 25 °C.

[0049] (2) The paper used is the book paper of the Republic of China with the original pH value of 4.46. After 28 days of dry heat aging, the pH value of the an...

Embodiment 3

[0052] (1) Using RDS type hectorite, immersed in a potassium nitrate ethanol solution with a concentration of 5wt%, the mass ratio of the solution to hectorite is 10:1, the temperature is 60°C, and the reaction time is 2 hours. The solid product was isolated by filtration, washed three times with ethanol, dried at 100° C. for 12 hours, and then calcined at 500° C. for 24 hours under an argon atmosphere. The alkaline hectorite with the loaded potassium species of 3% was obtained, and the slow-release alkaline hectorite functional protective agent was formulated with a mass ratio of 0.5 wt%.

[0053] (2) Pre-cleaning the paper with ear-washing balls to remove surface impurities, and treating the paper at a constant temperature and humidity for 5 hours under the conditions of a temperature of 20° C. and a humidity of 10% RH. Deacidification is carried out by dipping, the mass ratio of paper to deacidifying agent aqueous solution is 0.2:1, and it is soaked for 20 minutes at room t...

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Abstract

The invention relates to a slow-release hectorite multifunctional alkaline protective agent and a preparation method and application thereof, the protective agent comprises a solvent and an alkaline hectorite material dispersed in the solvent, and the alkaline hectorite material comprises hectorite and alkali or alkaline earth metal loaded on the hectorite; the preparation method comprises the following steps: 1) mixing an organic solution containing alkali or alkaline earth metal salt with hectorite, reacting, and filtering to obtain a solid product; 2) washing and roasting the solid product to obtain an alkaline hectorite material; 3) dispersing the alkaline hectorite material in a solvent to obtain the protective agent; the protective agent is used for multifunctional protection of safe deacidification, reinforcement and enhancement, bacteriostasis and the like of paper. Compared with the prior art, the protective agent disclosed by the invention is simple in preparation method, controllable in alkali amount and alkali strength, safe, non-toxic and harmless, has the functions of deacidification, reinforcement and enhancement, bacteriostasis, oxidation resistance and flame retardance on the paper cultural relics, has no obvious influence on paper color difference and pigments, and has high applicability to protection of the paper cultural relics.

Description

technical field [0001] The invention relates to the technical field of ancient book protection, in particular to a slow-release hectorite multifunctional alkaline protective agent and a preparation method and application thereof. Background technique [0002] Paper is an important carrier for recording information, but with the passage of time, paper cultural relics will turn yellow, brittle or even broken to varying degrees. This is because the cellulose and other components that make up paper are susceptible to hydrolysis, degradation and other reactions under the action of various factors such as physical, chemical, and biological factors, resulting in oxidative discoloration of paper cultural relics, reduction in mechanical strength, and irreversible losses. Therefore, the development of multifunctional paper cultural relics protection agent is imminent. [0003] Commonly used protective agents are mostly alkaline oxides, hydroxides, etc. (such as: MgO, CaO, Mg(OH) 2 ,...

Claims

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Application Information

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IPC IPC(8): D21H25/18B41M7/00
CPCD21H25/18B41M7/0063
Inventor 张宏斌刘鹏吴春芳高自港沈文静
Owner FUDAN UNIV
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