CN109371754B - Paper deacidification agent composition and deacidification method for acidified paper - Google Patents

Paper deacidification agent composition and deacidification method for acidified paper Download PDF

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CN109371754B
CN109371754B CN201811116917.2A CN201811116917A CN109371754B CN 109371754 B CN109371754 B CN 109371754B CN 201811116917 A CN201811116917 A CN 201811116917A CN 109371754 B CN109371754 B CN 109371754B
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weight
deacidification
tetraborate
parts
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CN109371754A (en
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何秋菊
王菊琳
许昆
赵瑞廷
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CAPITAL MUSEUMCHINA
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/18After-treatment of paper not provided for in groups D21H17/00 - D21H23/00 of old paper as in books, documents, e.g. restoring

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Abstract

The composition comprises alkaloid, soluble tetraborate and a solvent, wherein the alkaloid comprises one or more of scopolamine, hyoscyamine, demethylation hyoscyamine and anisodamine. The paper deacidification agent composition disclosed by the invention can perform a complex reaction with alum in acidified paper, prevent aluminum ions from being hydrolyzed to separate out acid, form alkali residues on the paper, alleviate the secondary acidification of the paper, have little influence on the appearance and color of the paper, enhance the folding resistance and tensile strength of the paper during deacidification, and effectively prolong the service life of the paper for painting and calligraphy, wherein the pH value of the paper after deacidification is 7-8.5.

Description

Paper deacidification agent composition and deacidification method for acidified paper
Technical Field
The present disclosure relates to a paper deacidification agent composition and a deacidification method for acidified paper; in particular to a deacidification method of an ancient book acid-removing agent composition for painting and calligraphy.
Background
The painting and calligraphy is a culture and artistic carrier, and a large number of collections are available in various comprehensive museums and folks all over the country. Most of the paper used for painting and calligraphy is handmade paper, and the traditional handmade paper (rice paper, hemp paper and the like) is a writing material formed by mutually interweaving plant fibers. Although the traditional hand paper adopts an alkaline papermaking method, fillers such as lime water, calcium carbonate and the like are added in the papermaking process, in order to improve the water resistance of the paper in the using process, the surface of the hand paper is often coated with collosol water consisting of alum and natural rubber materials so as to facilitate writing and drawing and prevent ink drops and pigment from scattering. In addition, alum is also used in large quantities in the ancient book repair process. Alum hydrolysis can separate out sulfuric acid, which causes hydrolytic breakage of cellulose chains, severe yellowing, acidification and embrittlement of ancient painting and calligraphy bodies, and the ancient painting and calligraphy bodies can be broken by touch when in severe cases. The results of our library survey were that in the library paper literature, pH values of less than 26% at 4.0, less than 91% at 6.0, and only 3% at greater than 7.0. In 2004, research reports of survey and analysis on acidity and preservation status of collected paper documents in library of China show that collected Songyuan accounts for 70% of moderate and severe acidification proportion, the average pH value of paper is 5.9, and the paper belongs to moderate acidification; the acidification degree of the Ming dynasty benevolence paper is lighter than that of the Song Yuan benevolence paper, wherein the moderate proportion and the serious proportion account for 41 percent, the average pH value of the paper is 6.2 and is close to mild acidification; the Qing Dynasty-benefit paper mainly uses bamboo paper, the acidification degree of the paper is more serious than that of Song Yuan, the average pH of the paper is 5.5, and the paper belongs to moderate acidification; paper acidification of recent historical literature and famous scripts of modern revolution is severe, with average pH values of 4.8 and 5.1, respectively, being severe and nearly severe. Paper is reported to have a pH below 5 and can only be stored for up to 200 years. A pH below 6.2 requires a deacidification treatment.
The acidification and deterioration degree of the painting and calligraphy paper show a trend of rising year by year as time goes on. Acidification of paper is a continuous process, and if not effectively treated, paper tends to darken, decrease in mechanical strength, become brittle, and even break down. Deacidification is a necessary means for delaying paper deterioration, and can eliminate or inhibit the acidification factor of the paper body and continuously resist the subsequent acidification influence, so that the service life of the paper cultural relics can be really prolonged. At present, the ancient painting and calligraphy is deacidified by adopting a warm water cleaning method in the repair and protection of the ancient painting and calligraphy, the acidification relieving effect of the ancient painting and calligraphy is very limited by the method, and the effect of delaying acidification cannot be achieved. Inorganic bases commonly used for paper deacidification, Ca (OH)2、Mg(HCO3)2Only can neutralize the acid on the surface of the paper, cannot deeply permeate into the fiber for complete deacidification, and the mechanical strength of the treated paper is reduced. Glycol amine, magnesium acetate/trichloroethylene, Ba (OH)2The deacidification method of organic solvents such as methanol and the like has certain limitation in use due to high toxicity. The ammonia gas, cyclohexylamine carbonate, morpholine, diethyl zinc and the like have the defects of high cost, operational danger and the like when being used for deacidifying alkaline gas.
Disclosure of Invention
The purpose of the present disclosure is to provide a paper deacidification agent composition and a deacidification method of acidified paper, wherein the composition can effectively prolong the service life of paper of ancient books and paintings.
To achieve the above object, a first aspect of the present disclosure: a paper deacidification agent composition is provided, which comprises alkaloid, soluble tetraborate and solvent, wherein the alkaloid comprises one or more of scopolamine, hyoscyamine, demethylation hyoscyamine and anisodamine.
Optionally, the alkaloid is present in an amount of 0.015 to 0.03 parts by weight, the soluble tetraborate salt is present in an amount of 0.01 to 0.5 parts by weight, and the solvent is present in an amount of 99.47 to 99.975 parts by weight, based on 100 parts by weight of the composition.
Optionally, the alkaloid is present in an amount of 0.02 to 0.03 parts by weight, the soluble tetraborate salt is present in an amount of 0.3 to 0.5 parts by weight, and the solvent is present in an amount of 99.47 to 99.68 parts by weight, based on 100 parts by weight of the composition.
Optionally, the alkaloids are scopolamine and hyoscyamine, the weight ratio of scopolamine to hyoscyamine being 1: (1-2).
Optionally, the soluble tetraborate salt is one or more selected from the group consisting of lithium tetraborate, sodium tetraborate, potassium tetraborate, and calcium tetraborate.
Optionally, the particle size of the soluble tetraborate is 80-100 μm.
Optionally, the solvent is a mixture of alcohol and water, the alcohol is methanol, ethanol, isopropanol or n-butanol, and the volume ratio of the alcohol to the water is 90: 10-20: 80.
optionally, the pH value of the composition is 8-9.
In a second aspect of the present disclosure: there is provided a process for deacidifying acidified paper, comprising: the paper deacidification composition of the first aspect of the present disclosure is sprayed on the surface of acidified paper, which is paper for modern painting and calligraphy, ancient painting and calligraphy, or ancient literature.
Optionally, with an area of 1cm2The acid removing agent composition for paper is used as a reference, and the dosage of the acid removing agent composition for paper is 0.15-0.3 mL.
Through the technical scheme, the paper deacidification agent composition with the excellent deacidification effect can be obtained by combining the special alkaloid and the soluble tetraborate, can perform a complex reaction with alum in the acidified paper to prevent aluminum ions from hydrolyzing to separate out acid, can form alkali residue on the paper to relieve secondary acidification of the paper, has little influence on appearance and appearance colors of the paper, and can enhance the folding resistance and tensile strength of the paper during deacidification, and the pH value of the deacidified paper is 7-8.5. The paper deacidification agent composition disclosed by the invention can effectively prolong the paper life of the painting and calligraphy, and has important significance for long-term preservation of the painting and calligraphy.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is SEM photographs of an acidified paper before and after being treated with the deacidification agent composition of example 1, wherein A is a non-deacidified rice paper, B is a deacidified rice paper, and C is a rice paper which is subjected to a wet heat aging treatment for 30 days after the deacidification treatment.
FIG. 2 is the pH test results of the acidified paper after treatment with the deacidification composition of example 1 and humid heat aging.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The first aspect of the disclosure: a paper deacidification agent composition is provided, which comprises alkaloid, soluble tetraborate and solvent, wherein the alkaloid comprises one or more of scopolamine, hyoscyamine, demethylation hyoscyamine and anisodamine. The sources of the scopolamine, the hyoscyamine, the demethylation hyoscyamine and the anisodamine are not specially limited in the disclosure, and the scopolamine, the demethylation hyoscyamine and the anisodamine can be obtained by commercial purchase or preparation or extraction by adopting a method in the prior art.
The paper deacidification agent composition with excellent deacidification effect can be obtained by combining special alkaloid and soluble tetraborate.
According to the present disclosure, the alkaloid may be contained in an amount of 0.015 to 0.03 parts by weight, the soluble tetraborate salt may be contained in an amount of 0.01 to 0.5 parts by weight, and the solvent may be contained in an amount of 99.47 to 99.975 parts by weight, based on 100 parts by weight of the composition.
In order to further improve the deacidification effect on the acidified paper, it is preferable that the content of the alkaloid is 0.02 to 0.03 part by weight, the content of the soluble tetraborate is 0.3 to 0.5 part by weight, and the content of the solvent is 99.47 to 99.68 parts by weight, based on 100 parts by weight of the composition.
In a preferred embodiment of the present disclosure, the alkaloids may be scopolamine and hyoscyamine. Further, the weight ratio of the scopolamine to the hyoscyamine may be 1: (1-2), the paper deacidification agent composition containing the combined alkaloid has small surface tension and strong permeability, is easier to enter paper fiber pores, and plays a role in neutralizing paper free acid and relieving secondary acidification caused by air pollution and the like.
According to the present disclosure, the soluble tetraborate salt may be one or more selected from the group consisting of lithium tetraborate, sodium tetraborate, potassium tetraborate, and calcium tetraborate. Preferably, the soluble tetraborate is lithium tetraborate, which is beneficial to improving the mechanical strength of paper and prolonging the service life of the paper. Further, the particle size of the soluble tetraborate can be 80-100 μm, so that micron-sized soluble tetraborate crystals can be dissolved in a pure water system and fully permeate in paper in a molecular form, and the micron-sized soluble tetraborate crystals play a role in neutralizing acidic substances in the paper and form certain alkali residues.
According to the present disclosure, the solvent is a solution in which the alkaloid and the soluble tetraborate salt are soluble, for example the solvent may be a mixture of alcohol and water. Further, the alcohol may be methanol, ethanol, isopropanol or n-butanol, and the volume ratio of the alcohol to the water may be 90: 10-20: 80.
the paper deacidification agent composition disclosed by the invention has a proper pH value, can form alkali residues on paper, and can relieve secondary acidification of the paper. Specifically, the pH value of the composition can be 8-9.
The paper deacidification agent composition can be obtained by mixing the alkaloid, the soluble tetraborate and the solvent according to a ratio, and can be mixed in an ultrasonic oscillation mode in order to improve the dissolving effect. The deacidification agent composition disclosed by the invention can perform a complex reaction with alum in acidified paper, prevent aluminum ions from being hydrolyzed to separate out acid, form alkali residues on the paper, alleviate the secondary acidification of the paper, have little influence on the appearance and color of the paper, and simultaneously enhance the folding resistance and tensile strength of the paper during deacidification, and the pH value of the paper after deacidification is 7-8.5. The deacidification agent composition can be used for deacidifying the acidified paper for painting and calligraphy by adopting various methods such as spraying, soaking, supercritical fluid and the like.
In a second aspect of the present disclosure: there is provided a process for deacidifying acidified paper, comprising: spraying the paper deacidification composition of the first aspect of the present disclosure onto the surface of acidified paper. Wherein the acidified paper can be paper for modern painting and calligraphy, paper for ancient painting and calligraphy or paper for ancient book and literature.
In order to achieve the ideal deacidification effect, the area is 1cm2The amount of the paper deacidification agent composition can be 0.15-0.3 mL based on the acidified paper. The spraying can be performed in a manner well known to those skilled in the art, and the spraying can be repeated 3 to 6 times.
The deacidification method disclosed by the invention is simple and convenient to operate and has a wide popularization value.
The present disclosure is further illustrated by the following examples.
In the examples, the hand-made paper samples used were Hongxing Tejing paper, purchased from Hongxing Xuan paper Co., Ltd, Jing county, Anhui. The alum is from high-grade alum of Beijing Qida Sen Chinese painting materials Co., Ltd, and the gelatin is from high-grade gelatin of Beijing Qida Sen Chinese painting materials Co., Ltd. Scopolamine was purchased from Shanghai leaf Biotech, Inc. at a purity of 98%. Hyoscyamine is available from Shanghai specialized pharmaceutical science and technology, Inc., and has a purity of 98%. Demethyl hyoscyamine was purchased from Shanghai Yubo Biotech, Inc. and was 99% pure. Anisodamine was purchased from Xiamen chemical Co., Ltd and was 99% pure. The other reagents are all commercial analytical pure products.
Examples 1 to 12 are illustrative of the paper deacidification agent composition of the present disclosure.
Example 1
0.01 part by weight of scopolamine, 0.02 part by weight of scopolamine, 0.4 part by weight of lithium tetraborate (particle size: 80 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content: 50 vol%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand to obtain the paper deacidification agent composition of the present example, which had a pH of 8.74.
Example 2
0.009 parts by weight of scopolamine, 0.018 parts by weight of scopolamine, 0.5 parts by weight of lithium tetraborate (particle size 100 μm) and 99.473 parts by weight of aqueous methanol solution (ethanol content 60 vol.%) were mixed, sufficiently stirred and ultrasonically shaken for 20min and then allowed to stand to obtain the paper deacidification composition of this example, which had a pH of 8.63.
Example 3
0.01 part by weight of scopolamine, 0.3 part by weight of lithium tetraborate (particle size 90 μm) and 99.68 parts by weight of an aqueous solution of n-butanol (n-butanol content 50 vol%) were mixed, sufficiently stirred and ultrasonically shaken for 20min and then allowed to stand to obtain the paper deacidification composition of the present example, which had a pH of 8.45.
Example 4
0.005 part by weight of scopolamine, 0.01 part by weight of scopolamine, 0.04 part by weight of lithium tetraborate (particle size: 80 μm) and 99.945 parts by weight of an aqueous ethanol solution (ethanol content: 50 vol.%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand, to obtain the paper deacidification agent composition of this example, which had a pH of 7.67.
Example 5
0.02 part by weight of scopolamine, 0.01 part by weight of scopolamine, 0.4 part by weight of lithium tetraborate (particle size: 80 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content: 50 vol%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand to obtain the paper deacidification agent composition of the present example, which had a pH of 8.26.
Example 6
0.03 part by weight of scopolamine, 0.4 part by weight of lithium tetraborate (particle size: 80 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content: 50 vol.%) were mixed, sufficiently stirred and ultrasonically vibrated for 20min, and then allowed to stand to obtain the paper deacidification agent composition of this example, which had a pH of 8.35.
Example 7
0.03 part by weight of hyoscyamine, 0.4 part by weight of lithium tetraborate (particle size 80 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content 50 vol.%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand to obtain the paper deacidification agent composition of this example, which had a pH of 8.46.
Example 8
0.01 part by weight of scopolamine, 0.02 part by weight of demethylation scopolamine, 0.4 part by weight of lithium tetraborate (particle size: 80 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content: 50 vol%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand to obtain the paper deacidification agent composition of the present example, having a pH of 8.21.
Example 9
0.01 part by weight of anisodamine, 0.02 part by weight of scopolamine, 0.4 part by weight of lithium tetraborate (particle size: 80 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content: 50 vol%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand to obtain the paper deacidification agent composition of the present example, which had a pH of 8.55.
Example 10
0.01 part by weight of scopolamine, 0.02 part by weight of scopolamine, 0.4 part by weight of sodium tetraborate (particle size: 80 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content: 50 vol.%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand, to obtain the paper deacidification agent composition of the present example, which had a pH of 8.27.
Example 11
0.003 part by weight of scopolamine, 0.006 part by weight of scopolamine, 0.3 part by weight of lithium tetraborate (particle size: 80 μm) and 99.691 parts by weight of an aqueous ethanol solution (ethanol content: 50% by volume) were mixed, sufficiently stirred and ultrasonically shaken for 20min and then allowed to stand to obtain the paper deacidification agent composition of the present example, which had a pH of 7.85.
Example 12
0.01 part by weight of scopolamine, 0.02 part by weight of scopolamine, 0.4 part by weight of lithium tetraborate (particle size of 200 μm) and 99.57 parts by weight of an aqueous ethanol solution (ethanol content of 50 vol%) were mixed, sufficiently stirred and ultrasonically shaken for 20min, and then allowed to stand to obtain the paper deacidification agent composition of the present example, which had a pH of 8.38.
Comparative examples 1-2 are provided to illustrate different paper deacidification compositions from the present disclosure.
Comparative example 1
The deacidification composition of this comparative example was prepared according to the method of CN108360296A example 1.
Comparative example 2
A deacidification composition was prepared as in example 1, except that the same amount of ephedrine was used in place of scopolamine and the same amount of coumarine was used in place of scopolamine, to provide the deacidification composition of this comparative example having a pH of 7.88.
Test examples
Selecting traditional manual rice paper as a sample, and cutting the rice paper into samples of 20mm multiplied by 150mm in a direction parallel to the curtain grain direction. Preparing 3 wt% gelatin and 3 wt% alum in a weight ratio of 1: 1, uniformly brushing the mixture by using a row brush, and repeating the brushing and brushing for three times to prepare the acidified paper which simulates the traditional Chinese painting and calligraphy and has the pH value of about 5.0.
The paper deacidification agent compositions of examples and comparative examples were uniformly sprayed on the surface of the acidified paper in an area of 1cm2The amount of the composition used is 0.15mL based on the acidified paper, and the spraying is repeated for 3 times and the composition is dried for later use.
The paper is subjected to a damp-heat aging test, which refers to the national standard GB/T22894-2008 'paper and paperboard accelerated aging humid-heat treatment under the conditions of 80 ℃ and 65% relative humidity'.
The microscopic morphology of the acidified paper before and after treatment with the deacidification agent composition of example 1 and the morphology of the inorganic salt crystals deposited between fibers were observed by Scanning Electron Microscopy (SEM), and the results are shown in fig. 1. Wherein the bulk crystalline particles are micron-sized soluble tetraborates in the deacidification agent composition. Therefore, the soluble tetraborate crystal can be uniformly dispersed in paper, plays a role in neutralizing acid substances in the paper and has certain alkali residue. After 30 days of damp-heat aging, a large amount of stored alkali still deposits on the rice paper, and has a certain positive effect on preventing the paper from further acidification.
Samples were taken every 7 days in the aging test and the pH of the acidified paper treated with the deacidification agent composition of example 1 was tested using a portable flat electrode acidimeter, Haina HI9025 Italy, the results of which are shown in FIG. 2. Therefore, the pH value of the rice paper after deacidification treatment is 7.83, the alkalinity is moderate, and the optimal pH value range (7.0-8.5) meeting the paper deacidification requirement is met. And with the prolonging of the aging time, the pH value of the paper is stable, and no obvious descending trend appears.
The folding resistance of the paper after acid removal treatment after 28 days of humid heat aging was measured by a YT-N-135 model MIT folding resistance tester manufactured by Hangzhou research science and technology Limited company according to the GB/T2679.5-2002 method, the tensile strength of the paper after 28 days of humid heat aging was measured by a TA.XT Plus texture analyzer manufactured by Stable Micro System company of UK, and the results are shown in Table 1 for the comparative example of the acidified paper without spraying the deacidification agent composition.
TABLE 1
Examples Folding strength/number of times Tensile Strength/N
Example 1 14 32.85986
Example 2 14 31.98796
Example 3 13 30.85974
Example 4 8 28.25302
Example 5 11 30.22006
Example 6 12 29.92316
Example 7 10 26.25764
Example 8 10 27.43626
Example 9 11 26.36522
Example 10 10 27.22216
Example 11 8 24.15642
Example 12 10 23.25674
Comparative example 1 5 18.28948
Comparative example 2 6 17.98796
Comparative example 2 10.7856
As can be seen from table 1, the folding strength and tensile strength of the paper after deacidification treatment with the paper deacidification agent composition disclosed herein are significantly increased, which indicates that the paper deacidification agent composition disclosed herein is beneficial to improving the folding strength and tensile strength of the paper, has a significant promotion effect on the improvement of the mechanical properties of the paper, can delay the further acidification of the paper, and is beneficial to the long-term storage of the paper.
The change of the chromaticity value of the paper after deacidification treatment was measured by using a spectroscopic colorimeter model SP64 manufactured by AICOLY USA, the color difference value of the paper after wet-heat aging for 28 days was calculated, and the result is shown in Table 2 for a comparative example of acidified paper without spraying the deacidification agent composition.
TABLE 2
Examples ΔE
Example 1 2.63
Example 2 1.12
Example 3 1.15
Example 4 0.96
Example 5 2.81
Example 6 1.96
Example 7 2.26
Example 8 2.48
Example 9 2.15
Example 10 2.64
Example 11 2.05
Example 12 1.92
Comparative example 1 4.06
Comparative example 2 6.44
Comparative example 7.96
As can be seen from table 2, the color change of the acidified paper during the thermal aging process is severe, and the color difference before and after the acidified paper treated with the deacidification agent composition of the present disclosure is less than 3.0, which indicates that the composition of the present disclosure has little influence on the appearance of the paper and is suitable for deacidification of the paper.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A paper deacidification composition, which is characterized by comprising alkaloid, soluble tetraborate and a solvent, wherein the alkaloid comprises one or more of scopolamine, hyoscyamine, demethylation hyoscyamine and anisodamine.
2. The composition according to claim 1, wherein the alkaloid is contained in an amount of 0.015 to 0.03 parts by weight, the soluble tetraborate salt is contained in an amount of 0.01 to 0.5 parts by weight, and the solvent is contained in an amount of 99.47 to 99.975 parts by weight, based on 100 parts by weight of the composition.
3. The composition according to claim 2, wherein the alkaloid is contained in an amount of 0.02 to 0.03 parts by weight, the soluble tetraborate is contained in an amount of 0.3 to 0.5 parts by weight, and the solvent is contained in an amount of 99.47 to 99.68 parts by weight, based on 100 parts by weight of the composition.
4. A composition according to any one of claims 1 to 3, wherein the alkaloids are scopolamine and hyoscyamine in a weight ratio of 1: (1-2).
5. The composition of any one of claims 1 to 3, wherein the soluble tetraborate salt is one or more selected from lithium tetraborate, sodium tetraborate, potassium tetraborate and calcium tetraborate.
6. A composition according to any one of claims 1 to 3, wherein the soluble tetraborate has a particle size of from 80 to 100 μm.
7. The composition according to any one of claims 1 to 3, wherein the solvent is a mixture of alcohol and water, the alcohol is methanol, ethanol, isopropanol or n-butanol, and the volume ratio of the alcohol to the water is 90: 10-20: 80.
8. the composition according to any one of claims 1 to 3, wherein the pH of the composition is 8 to 9.
9. A method for deacidifying acidified paper, comprising: the paper deacidification composition according to any one of claims 1 to 8 is sprayed on the surface of acidified paper, wherein the acidified paper is used as paper for modern painting and calligraphy, ancient painting and calligraphy or ancient book literature.
10. The method of claim 9, wherein the area is 1cm2The acid removing agent composition for paper is used as a reference, and the dosage of the acid removing agent composition for paper is 0.15-0.3 mL.
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CN108360296A (en) * 2018-03-06 2018-08-03 杭州众材科技有限公司 A kind of paper sheet deacidification agent and its preparation method and application

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