CN113186754B - Protection method suitable for paper homogenization deacidification - Google Patents
Protection method suitable for paper homogenization deacidification Download PDFInfo
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- CN113186754B CN113186754B CN202110487969.6A CN202110487969A CN113186754B CN 113186754 B CN113186754 B CN 113186754B CN 202110487969 A CN202110487969 A CN 202110487969A CN 113186754 B CN113186754 B CN 113186754B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/02—Chemical or biochemical treatment
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
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Abstract
The application provides a protection method suitable for paper homogenization deacidification, which comprises the following steps: 1) curing the paper to be deacidified; 2) atomizing and deacidifying, namely applying the atomized deacidifying solution to the surface of the cured paper to perform uniform deacidification on the paper. The method is characterized in that the acidified paper is cured firstly, so that the pH distribution on the surface of the paper tends to be uniform, the deacidification solution can be ensured to uniformly act on the surface of the paper in the subsequent atomization deacidification process, and the phenomenon of non-uniform deacidification of the paper is avoided.
Description
Technical Field
The application relates to the field of paper deacidification protection, in particular to a protection method suitable for paper homogenization deacidification.
Background
The paper mainly comprises cellulose, and hydrophilic groups exist on the surfaces of cellulose molecules, so that the paper can keep a certain water content under normal conditions. The water content of the paper refers to the percentage value of the mass of the paper reduced when the paper is dried to be constant in weight at 100-150 ℃ to the original mass of the paper. Meanwhile, the water content of the paper is also influenced by the relative humidity of the environment, and the concept of the relative humidity is that the quantity of water vapor contained in unit volume of air is compared with the quantity percentage of water vapor contained in saturated water vapor with the same volume under the same temperature condition. In general, the higher the ambient relative humidity, the higher the sheet moisture content. The water content of the paper during storage is between 4% and 7%. Keeping a certain water content will improve the flexibility of the paper, increase the tensile strength and surface strength of the paper, and make the paper more convenient for writing.
Because the paper has certain water content, the paper also has certain pH value, and because of factors such as impurity residue, bacteria, external pollution and the like in the preparation process, the paper can be gradually acidified after being stored for a period of time, namely the whole paper is acidic. Cellulose molecular chains in paper can accelerate hydrolysis under an acidic condition, namely the acidic hydrolysis of cellulose, the hydrolysis of the cellulose can reduce the strength of the paper, the aging of the paper is accelerated, and finally the paper becomes brittle and fragile and cannot be used normally. Therefore, for the acidification of paper, redundant hydrogen ions in the paper should be removed in time to keep the paper in a weak alkali state, which is also called deacidification of the paper.
Normally, water molecules in the paper are inert, so that the acid-base distribution of the paper per se has non-uniformity, and the paper has great randomness in the acidification process, so that the acidification degree of the paper is different from place to place after acidification. However, in the current paper deacidification protection method, paper is regarded as a whole with the same acidification degree, the dosage of the paper deacidification agent is basically the same at each part of the paper, and although the whole paper can be deacidified, the phenomenon that the alkali residue is too high in partial areas of the paper after deacidification is also avoided, and the cellulose in the areas is subjected to alkaline hydrolysis when the alkali residue is too high, so that the decomposition of the cellulose is accelerated, and the structure and the appearance of the paper are damaged.
Disclosure of Invention
In view of the above, it is necessary to provide a protection method suitable for the uniform deacidification of paper.
The technical scheme provided by the invention is as follows: a protection method suitable for paper homogenization deacidification comprises the following steps:
1) curing the paper to be deacidified;
2) atomizing and deacidifying, namely applying the atomized deacidifying liquid to the surface of the cured paper to carry out uniform deacidification on the paper.
According to the technical scheme, the paper is cured, namely the paper is in an environment with certain humidity, temperature and air pressure, the paper is in a wet state in the curing process, water molecules in the acidified paper are activated in the wet state, the diffusion coefficient in the paper is increased, hydrogen ions in the paper move under the drive of chemical potential, the content of the hydrogen ions at all positions of the paper is the same, and the acidification degree tends to be uniform. And then deacidifying the paper, wherein the acidification degrees of the paper at all positions after the paper is cured are the same, so that the technical scheme can realize the uniform deacidification of the paper, and avoid the problem of excessive deacidification in different areas after deacidification caused by different acidification degrees of the paper in the deacidification process.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the curing treatment is to put the paper to be deacidified into a curing box for treatment.
Optionally, the relative humidity in the curing box is 90% -99%. The relative humidity affects the water content of the paper and the diffusion path of ions in the paper in the curing process, and the larger the relative humidity is, the easier the water molecules and ions in the paper are diffused.
Optionally, the temperature of the curing treatment is 40-60 ℃. The temperature directly influences the activity and the diffusion capacity of water molecules in paper, the higher the temperature is, the stronger the diffusion capacity of the water molecules is, the shorter the time required for uniform distribution of hydrogen ions is, but the structure of paper cellulose can be damaged due to the overhigh temperature.
Optionally, the pressure of the curing treatment is 1-3 atmospheres. The pressure during the curing process is adjusted by adjusting the volume of the curing chamber, and in an insulated curing chamber, the pressure and volume are inversely proportional. Under a larger pressure, the effect of the chemical potential in the paper on the diffusion of the hydrogen ions is amplified, and the diffusion movement of the hydrogen ions can be accelerated. Further optionally, the pressure of the curing treatment is 1.5-3 atmospheres.
Optionally, the curing time is 2-6 h. The aim of the curing treatment is to ensure that hydrogen ions in the paper are evenly distributed in the paper under the driving of chemical potential, the time is too short to achieve the even distribution, and the time is too long to cause unrecoverable damage to the appearance and the structure of the paper.
Optionally, the paper is placed under atmospheric pressure after curing treatment, stands in an environment with a relative humidity of 50-60% and a temperature of 20-25 ℃, and is atomized and deacidified after the paper returns to a normal state. Further optionally, the standing time is 20-48 h.
Optionally, the deacidification solution in step 2) is one or more of a calcium hydroxide solution, a magnesium hydroxide solution, a calcium bicarbonate solution or a magnesium bicarbonate solution.
Optionally, the atomization manner in step 2) includes mechanical atomization, medium atomization or ultrasonic atomization.
The invention has the following beneficial effects:
(1) the method provided by the invention can be used for completing the uniform deacidification of the paper without damaging the structure and the appearance of the paper.
(2) The paper is cured by the method, so that the requirements on equipment and environment are not high, the paper can be treated in batches, hydrogen ions in the paper are uniformly distributed, and the deacidification effect in the subsequent deacidification process is improved.
(3) The atomization deacidification method provided by the invention is simple in process, the atomized deacidification liquid is uniformly distributed on the surface of the paper, and the problems that the pH value of the paper is not uniformly distributed after deacidification and excessive deacidification occurs in partial areas can be avoided.
Drawings
FIG. 1 is a schematic view showing the structure of a maturation box for sheets of paper in the example.
Wherein: 1. a vent valve; 2. a heat-insulating layer; 3. a thermometer and a hygrometer; 4. a heating device; 5. a humidifier; 6. a propulsion device.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For a better description and illustration of embodiments of the application, reference may be made to one or more of the drawings, but additional details or examples used in describing the drawings should not be construed as limiting the scope of any of the inventive concepts of the present application, the presently described embodiments, or the preferred versions.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in figure 1, the shell of the curing box is composed of an insulating layer 2, a vent valve 1 can be used for adjusting the pressure in the curing box, and the temperature and the relative humidity in the curing box can be monitored at any time through a thermometer and a hygrometer 3. The heating device 4 can be used for controlling the temperature in the curing box, the humidifier 5 can be used for controlling the relative humidity in the curing box, and the insulating layer on the right side in the figure is provided with a propulsion device 6 which can be used for adjusting the gas pressure in the curing box.
Example 1
And (2) putting the paper to be deacidified into a curing box for treatment, adjusting the temperature of the curing box to be 50 ℃ and the relative humidity to be 95% by adjusting a heating device 4 and a humidifier 5, then adjusting a propelling device 6 of the curing chamber, adjusting the volume of the curing chamber to be 0.5 time of the original volume, namely adjusting the pressure of the curing chamber to be 2 atmospheric pressures, starting timing after the completion, and taking out the paper to be deacidified after 4 hours.
After the paper is cured, standing the paper to be deacidified for 24 hours under the atmospheric pressure, the relative humidity of 50-60% and the temperature of 20-25 ℃, and performing subsequent treatment after the paper is restored to a normal state.
And (3) carrying out ultrasonic atomization deacidification treatment on the paper by using a 5 wt% calcium hydroxide solution, taking out the paper after deacidification is finished, and naturally drying the paper to finish the whole deacidification process.
And (3) performance testing:
the same untreated paper as in example 1 was taken for pH testing with the deacidified paper literature of example 1. The specific method for testing the pH value is to equally divide the paper into a plurality of areas, ensure the area of each area to be 2-4 square centimeters, respectively test and record the pH value of the midpoint of each area, and finally calculate the variance of the pH values of the areas.
In the example of the patent, paper is equally divided into 12 regions, the pH values of the regions are respectively tested, and finally the variance value is calculated. The test results are shown in table 1, and the untreated acidified paper is obviously acidic, and the variance is large, which indicates that the pH value fluctuation of each area of the paper surface is large, i.e. the acidification degree of the paper is not uniform. After the paper is subjected to curing treatment and atomization deacidification, the pH value of the paper is obviously improved, the variance is small, the pH value distribution of each area is uniform, and the problem of overhigh alkaline residue does not exist.
Table 1: pH value and variance before and after paper curing and deacidification treatment
Comparative example 1
Selecting the same paper to be deacidified as in example 1, putting the paper to be deacidified into a curing box for treatment, adjusting the temperature of the curing box to be 55 ℃ and the relative humidity to be 95% by adjusting a heating device 4 and a humidifier 5, then adjusting a propelling device 6 of the curing chamber, adjusting the volume of the curing chamber to be 0.8 time of the original volume, starting timing after the adjustment is finished, and taking out the paper to be deacidified after 4 hours.
After curing treatment of the paper, standing the paper to be deacidified for 24 hours under the atmospheric pressure, in an environment with the relative humidity of 50-60% and the temperature of 20-25 ℃, taking out the paper after the paper is restored to a normal state, naturally drying the paper, and then carrying out performance detection.
And (3) performance testing:
the same untreated paper as in comparative example 1 and the ripened paper as in comparative example 1 were taken for pH test. The method of testing the pH was the same as in the performance test in example 1.
The final test results are shown in table 2, where both the untreated paper and the aged paper are acidic, but the aged paper has a smaller variation in pH value in each region than the untreated paper, because the aged treatment moves hydrogen ions in the paper under chemical potential, so that the distribution of hydrogen ions in the paper tends to be uniform.
Table 2: pH value and variance before and after paper aging treatment
Comparative example 2
The same paper to be deacidified as in example 1 was selected, and was subjected to ultrasonic atomization deacidification treatment directly with 5 wt% calcium hydroxide solution, and after deacidification was completed, the paper was taken out and naturally dried, thus completing the entire deacidification process.
And (3) performance testing:
the same untreated paper as in comparative example 2 and the deacidified paper as in comparative example 2 were taken for pH testing. The method of testing the pH was the same as in the performance test in example 1.
The final test results are shown in table 3, the paper without deacidification treatment is acidic, and the paper after atomization deacidification treatment is alkaline, but the pH value variance of each area on the surface of the paper is large, the distribution of the pH value is not uniform, and the problem of excessive alkaline residue exists in partial areas.
Table 3: pH value and variance before and after direct atomization deacidification treatment of paper
Example 2
The temperature of the aging chamber in example 1 was adjusted to 40 ℃ and the same procedure as in example 1 was repeated. The final deacidification effect was substantially the same as in example 1.
Example 3
The temperature of the aging chamber in example 1 was adjusted to 60 ℃ and the same procedure as in example 1 was repeated. The final deacidification effect was substantially the same as in example 1.
Example 4
The relative humidity of the ripening chamber in example 1 was adjusted to 90%, and the procedure was otherwise the same as in example 1. The final deacidification effect was substantially the same as in example 1.
Example 5
The relative humidity of the ripening chamber in example 1 was adjusted to 99%, and the procedure was otherwise the same as in example 1. The final deacidification effect was substantially the same as in example 1.
Example 6
The gas pressure in the maturation chamber of example 1 was adjusted to 1.5 atmospheres, and the procedure was otherwise the same as in example 1. The final deacidification effect was substantially the same as in example 1.
Example 7
The gas pressure in the maturation chamber of example 1 was adjusted to 3 atmospheres, and the procedure was otherwise the same as in example 1. The final deacidification effect was substantially the same as in example 1.
Example 8
The aging time in example 1 was adjusted to 2 hours, and the procedure was otherwise the same as in example 1. The final deacidification effect was substantially the same as in example 1.
Example 9
The aging time in example 1 was adjusted to 6 hours, and the procedure was otherwise the same as in example 1. The final deacidification effect was substantially the same as in example 1.
Example 10
The deacidification solution in example 1 was adjusted to a 7 wt% calcium bicarbonate solution, and the same procedure as in example 1 was repeated. The final deacidification effect was substantially the same as in example 1.
Example 11
The aqueous deacidification solution of example 1 was adjusted to a 5 wt% magnesium hydroxide solution, and the same procedure as in example 1 was repeated. The final deacidification effect was substantially the same as in example 1.
Example 12
The aqueous deacidification solution of example 1 was adjusted to an 8 wt% magnesium bicarbonate solution, and the procedure of example 1 was followed. The final deacidification effect was substantially the same as in example 1.
Example 13
The atomization method of the deacidification solution in the example 1 is adjusted to mechanical atomization, and the rest is the same as the operation steps of the example 1. The final deacidification effect was substantially the same as in example 1.
Example 14
The atomization method of the deacidification solution in the example 1 is adjusted to medium atomization, and the rest is the same as the operation steps of the example 1. The final deacidification effect was substantially the same as in example 1.
Claims (4)
1. A protection method suitable for paper homogenization deacidification is characterized by comprising the following steps:
1) curing the paper to be deacidified; the curing treatment is to put the paper to be deacidified into a curing box for treatment; the relative humidity in the curing box is 90-99%; the curing temperature is 40-60 ℃; the air pressure of the curing treatment is 1-3 atmospheric pressures; the curing treatment time is 2-6 h;
2) atomizing and deacidifying, namely applying the atomized deacidifying liquid to the surface of the cured paper to carry out uniform deacidification on the paper.
2. The protection method suitable for paper uniform deacidification according to claim 1, wherein the paper is placed under atmospheric pressure after being cured, kept stand at a relative humidity of 50-60% and a temperature of 20-25 ℃, and atomized deacidification is performed after the paper returns to a normal state.
3. The protection method suitable for paper uniform deacidification according to claim 1, wherein the deacidification solution in the step 2) is one or more of calcium hydroxide solution, magnesium hydroxide solution, calcium bicarbonate solution or magnesium bicarbonate solution.
4. The protection method suitable for paper sheet uniform deacidification according to claim 1, wherein the atomization mode in the step 2) comprises mechanical atomization, medium atomization or ultrasonic atomization.
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| CN202110385975 | 2021-04-09 | ||
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| AU2712699A (en) * | 1998-02-10 | 1999-08-30 | Oswald Bell | Method for disacidifying paper products with printings or inscriptions |
| SK500222008A3 (en) * | 2008-06-09 | 2010-01-07 | Gabriela Katuščáková | Method of modification of documents, especially paper documents, books, archive documents and others sheet materials |
| CN102242529A (en) * | 2011-04-28 | 2011-11-16 | 广东工业大学 | Pressurizing, atomizing and deacidifying device and method for pressurizing, atomizing and deacidifying by using same |
| CN103147353A (en) * | 2013-03-29 | 2013-06-12 | 广东工业大学 | Ultrasound-assisted method for deacidification of paper |
| CN104988801A (en) * | 2015-07-02 | 2015-10-21 | 浙江大学 | Deacidification system |
| CN108004847A (en) * | 2017-11-28 | 2018-05-08 | 华南理工大学 | A kind of new ancient books depickling restorative procedure |
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2021
- 2021-04-30 CN CN202110487969.6A patent/CN113186754B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2712699A (en) * | 1998-02-10 | 1999-08-30 | Oswald Bell | Method for disacidifying paper products with printings or inscriptions |
| SK500222008A3 (en) * | 2008-06-09 | 2010-01-07 | Gabriela Katuščáková | Method of modification of documents, especially paper documents, books, archive documents and others sheet materials |
| CN102242529A (en) * | 2011-04-28 | 2011-11-16 | 广东工业大学 | Pressurizing, atomizing and deacidifying device and method for pressurizing, atomizing and deacidifying by using same |
| CN103147353A (en) * | 2013-03-29 | 2013-06-12 | 广东工业大学 | Ultrasound-assisted method for deacidification of paper |
| CN104988801A (en) * | 2015-07-02 | 2015-10-21 | 浙江大学 | Deacidification system |
| CN108004847A (en) * | 2017-11-28 | 2018-05-08 | 华南理工大学 | A kind of new ancient books depickling restorative procedure |
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