CN108425272B - Method for protecting paper document by adopting electrostatic spinning fiber membrane - Google Patents
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- CN108425272B CN108425272B CN201810158937.XA CN201810158937A CN108425272B CN 108425272 B CN108425272 B CN 108425272B CN 201810158937 A CN201810158937 A CN 201810158937A CN 108425272 B CN108425272 B CN 108425272B
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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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
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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
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a method for protecting paper documents by electrostatic spinning fiber membranes, which is applied to paper documents, electrostatic spinning solution prepared by an ultraviolet shielding agent directly takes the surfaces of various papers of the paper documents as receiving base materials to carry out electrostatic spinning to form electrostatic spinning fiber membranes, and electrostatic spraying solution prepared by a fluorine-free waterproof agent and an ultraviolet absorbent is further used on the surfaces of the electrostatic spinning fiber membranes to carry out electrostatic spraying to form an electrostatic spraying protective film, so that the surfaces of the various papers of the paper documents are tightly attached with inorganic-organic composite waterproof breathable ultraviolet-resistant film materials, the film material film structure has a multistage rough structure, the obtained film materials have better superhydrophobicity by combining the modification of the fluorine-free waterproof agent, and the aim of increasing the ultraviolet resistance effect by the inorganic-organic composite is fulfilled by the dual functions of the ultraviolet shielding agent and the ultraviolet absorbent, the film material has high ultraviolet protection capability and air permeability, and can protect paper documents more comprehensively.
Description
Technical Field
The invention relates to the technical field of protective films, in particular to a method for protecting a paper document by adopting an electrostatic spinning fiber film.
Background
Books and documents of cultural relics which take paper as a carrier play an important role which is difficult to replace for the propagation of human civilization, the social progress and the development of scientific technology. However, over time, these paper documents are extremely vulnerable to the external environment, which causes aging and damage, and thus the paper documents having the meaning of memorabilia or cultural relics gradually die.
The existing archives in China are mostly paper archives, and the maintenance of the paper archives in countries, museums or families every year needs a lot of financial resources. In recent years, the fearfulness of aging and self-destruction of books and archives is recognized by all countries in the world, and the protection of paper documents is particularly important.
Prior art protection of paper documents is commonly known as wrapping the cover of a paper document, for example, the invention patent application with application No. 201610226896.4 provides a multi-layer composite nonwoven fabric-based book cover that provides protection of the book core with more durability, flexibility and cover stability by wrapping both side covers of the book with a BOPP film and another high temperature cover.
The inventors have found that the cover of a paper document is covered by a cover only to protect the cover of the paper document, and the paper document, especially a paper document with at least two pages, is usually required to be turned over by a user for a long time, and the paper inside the paper document is extremely easily exposed to ultraviolet rays and the like to promote the aging of the paper.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for protecting a paper document by adopting an electrostatic spinning fiber membrane.
According to an aspect of an embodiment of the present invention, there is provided a method for protecting a paper document by using an electrospun fiber membrane, the method including:
adding an ultraviolet shielding agent into a first container containing an ultraviolet shielding agent solvent, carrying out ultrasonic treatment for 1-20 hours to obtain an ultraviolet shielding agent solution, and adding the ultraviolet shielding agent solution into a high-molecular polymer solution, and mechanically stirring for 3-24 hours to obtain an electrostatic spinning solution;
adding a fluorine-free waterproof agent and an ultraviolet absorbent into a second container containing a fluorine-free waterproof agent solvent and an ultraviolet absorbent solvent, and mechanically stirring for 3-24 hours to prepare an electrostatic spraying solution;
for each paper included in the paper document, taking the paper as a receiving base material, and sending the electrostatic spinning solution into an electrostatic spinning device for electrostatic spinning, so that electrostatic spinning fibers obtained in the electrostatic spinning process are deposited on the surface of the paper to form an electrostatic spinning fiber film;
sending the electrostatic spraying solution into an electrostatic spraying device for electrostatic spraying by taking the electrostatic spinning fiber membrane as a receiving base material, so that the electrostatic spraying solution is deposited on the surface of the electrostatic spinning fiber membrane to form an electrostatic spraying protective film;
and (2) sending the paper document, the electrostatic spinning fiber membrane and the electrostatic spraying protective film into a vacuum oven together for physical heating at 40-70 ℃ for 2-10 h, so that the composite protective film formed by the electrostatic spinning fiber membrane and the electrostatic spraying protective film is fixed on various papers in the paper document.
In a preferred embodiment, the ultraviolet shielding agent is at least one of zinc oxide, titanium dioxide, aluminum oxide and magnesium oxide, the content of the ultraviolet shielding agent is 0.05-10 wt% of the electrostatic spinning solution, and the high molecular polymer in the high molecular polymer solution is at least one of polyacrylonitrile, polyurethane, polyvinylidene fluoride, polyether sulfone, aramid, nylon 6, nylon 66, polystyrene and polylactic acid.
In a preferred embodiment, the ultraviolet absorbent is at least one of salicylic acid esters, benzophenone derivatives, benzotriazoles and cinnamate polymers, the content of the ultraviolet absorbent is 0.1-15 wt% of the electrostatic spraying solution, the fluorine-free waterproof agent is at least one of polysiloxane, amino silicone oil, hyperbranched dendrimer polymers and long-chain alkane waterproof agents, and the content of the fluorine-free waterproof agent is 1-25 wt% of the electrostatic spraying solution.
In a preferred embodiment, the voltage used in the electrostatic spraying process is 30-120 kV, the receiving distance is 5-60 cm, the temperature is 15-30 ℃, and the relative humidity is 20-90%.
In a preferred embodiment, the method further comprises:
and air-drying the surface of the composite protective film of each paper in the paper document by using air blowing equipment, and removing the residual solvent on the surface of the composite protective film.
Compared with the prior art, the method for protecting the paper document by adopting the electrostatic spinning fiber membrane has the following advantages:
the invention provides a method for protecting paper documents by adopting electrostatic spinning fiber membranes, which is characterized in that electrostatic spinning solution configured by an ultraviolet shielding agent (inorganic anti-ultraviolet agent) directly takes the surfaces of various paper of the paper documents as receiving base materials to carry out electrostatic spinning to form the electrostatic spinning fiber membranes, and electrostatic spraying solution configured by a fluorine-free waterproof agent and an ultraviolet absorbent (organic anti-ultraviolet agent) is further used for carrying out electrostatic spraying on the surfaces of the electrostatic spinning fiber membranes to form an electrostatic spraying protective membrane, so that the surfaces of various paper of the paper documents are tightly adhered with inorganic-organic composite waterproof breathable anti-ultraviolet thin film materials, the film structures of the thin film materials have multistage rough structures, and the obtained thin film materials have better super-hydrophobicity by combining the modification of the fluorine-free waterproof agent: the contact angle is more than or equal to 150 degrees, the rolling angle is less than or equal to 5 degrees, the aim of increasing the ultraviolet resistance effect by inorganic-organic compounding is realized through the double action of the ultraviolet shielding agent and the ultraviolet absorbent, the Ultraviolet Protection Factor (UPF) of the film material is more than or equal to 1500, the film material also keeps better air permeability (more than or equal to 10 mm/s), the film material with the waterproof, air permeability and ultraviolet resistance properties also has good tailorability and easy usability, has wide application potential in the fields of paper document protection, important archive storage and the like, adopts more environment-friendly physical reinforcement to perform film reinforcement on the surface of the paper cultural relic, and has less pollution to the environment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart illustrating a method for protecting a paper document using an electrospun fiber membrane according to an exemplary embodiment.
Fig. 2 is a schematic diagram illustrating the structure of various papers and composite protective films according to an exemplary embodiment.
Detailed Description
The present invention is described in detail below with reference to specific embodiments (but not limited to) and the accompanying drawings, the specific method of the embodiments is only for illustrating the invention, the scope of the invention is not limited by the embodiments, the invention can be applied to various modifications and changes of shape and structure, and these equivalents based on the invention are also within the scope of the claims of the present invention.
Fig. 1 is a flow chart illustrating a method of protecting a paper document using an electrospun fiber membrane, applied to the paper document, according to an exemplary embodiment, comprising:
The first container may be a chemical container such as a beaker or a flask.
102, adding the fluorine-free waterproof agent and the ultraviolet absorbent into a second container containing the fluorine-free waterproof agent solvent and the ultraviolet absorbent solvent, and mechanically stirring for 3-24 hours to prepare the electrostatic spraying solution.
The second container may be a chemical container such as a beaker or a flask.
103, for each paper included in the paper document, taking the paper as a receiving base material, and sending the electrostatic spinning solution into an electrostatic spinning device for electrostatic spinning, so that electrostatic spinning fibers obtained in the electrostatic spinning process are deposited on the surface of the paper to form an electrostatic spinning fiber film.
The paper in the paper document can be used as a receiving substrate of an electrostatic spinning process in a split or independent opening mode, so that an electrostatic spinning fiber film can be formed on the surface of each paper in the paper document.
For each paper included in the paper document, the invention can take one surface of the paper containing characters, patterns and the like as a receiving surface to receive the electrostatic spinning fibers to form the electrostatic spinning fiber film, or take both surfaces of the paper as receiving surfaces to receive the electrostatic spinning fibers to form the electrostatic spinning fiber film. For better protection, the embodiment of the present invention preferably uses both sides of the paper as receiving surfaces to receive electrospun fibers to form an electrospun fiber film.
The paper document includes, but is not limited to, typical papers such as rice paper, newspaper, offset paper, and ancient book paper, or books formed of the papers.
And 104, taking the electrostatic spinning fiber membrane as a receiving base material, and sending the electrostatic spraying solution into an electrostatic spraying device for electrostatic spraying so that the electrostatic spraying solution is deposited on the surface of the electrostatic spinning fiber membrane to form an electrostatic spraying protective film.
And 105, conveying the paper document, the electrostatic spinning fiber membrane and the electrostatic spraying protective film into a vacuum oven together for physical heating, wherein the heating temperature is 40-70 ℃, and the heating time is 2-10 hours, so that the composite protective film formed by the electrostatic spinning fiber membrane and the electrostatic spraying protective film is fixed on various papers in the paper document.
In a preferred embodiment, the ultraviolet shielding agent is at least one of zinc oxide, titanium dioxide, aluminum oxide and magnesium oxide, the content of the ultraviolet shielding agent is 0.05-10 wt% of the electrostatic spinning solution, and the high molecular polymer in the high molecular polymer solution is at least one of polyacrylonitrile, polyurethane, polyvinylidene fluoride, polyether sulfone, aramid, nylon 6, nylon 66, polystyrene and polylactic acid.
The ultraviolet screening agent is inorganic uvioresistant agent.
In a preferred embodiment, the ultraviolet absorbent is at least one of salicylic acid esters, benzophenone derivatives, benzotriazoles and cinnamate polymers, the content of the ultraviolet absorbent is 0.1-15 wt% of the electrostatic spraying solution, the fluorine-free waterproof agent is at least one of polysiloxane, amino silicone oil, hyperbranched dendrimer polymers and long-chain alkane waterproof agents, and the content of the fluorine-free waterproof agent is 1-25 wt% of the electrostatic spraying solution.
The ultraviolet absorbers are all organic anti-ultraviolet agents.
In a preferred embodiment, the voltage used in the electrostatic spraying process is 30-120 kV, the receiving distance is 5-60 cm, the temperature is 15-30 ℃, and the relative humidity is 20-90%.
In a preferred embodiment, the method further comprises:
and air-drying the surface of the composite protective film of each paper in the paper document by using air blowing equipment, and removing the residual solvent on the surface of the composite protective film.
Residual solvent may remain on the surface of the paper document after physical heating, and in order to better ensure the quality of the composite protective film on the surface of the paper, the residual solvent on the surface of the composite protective film can be dried by using a blowing device.
Wherein the blowing device may be a blower.
In order to facilitate understanding of the present invention, a schematic structural diagram of various papers and composite protective films in a paper document after the method for protecting the paper document by using the electrostatic spinning fiber film provided by the present invention is specifically shown, as shown in fig. 2, a is an electrostatic spraying protective film in the composite protective film, B is an electrostatic spinning fiber film in the composite protective film, and C is a paper in the paper document.
Ultraviolet rays are a general term for radiation having a wavelength of 10nm to 400nm in the electromagnetic spectrum, and are generated by exciting electrons in the outer layer of atoms. The main ultraviolet light source in nature is the sun, and ultraviolet rays with the wavelength shorter than 290nm when sunlight penetrates through the atmosphere are absorbed by ozone in the atmosphere. In real life, the storage place of paper documents is very easy to be contacted with factors containing strong ultraviolet rays, such as sunlight, and the ultraviolet rays are important factors causing the cellulose denaturation of paper. The existing protection of paper documents is only limited to the protection of covers of the paper documents, but the protection of paper inside the paper documents is often ignored, and the aging effect of ultraviolet rays on the paper is also ignored. According to the invention, the anti-ultraviolet capability of the paper document is improved by using the combined action of the organic anti-ultraviolet agent and the inorganic anti-ultraviolet agent, the composite protective film formed on the paper surface of the paper document has air permeability, waterproofness and anti-ultraviolet property, and the method for protecting the paper document has the advantages of simple and convenient process and high processing efficiency.
In order to improve the protection effect of the method for protecting the paper document by adopting the electrostatic spinning fiber membrane, provided by the invention, on the paper document, the inventor conducts relevant data tests on the influence of the content of the ultraviolet shielding agent, the content of the ultraviolet absorbing agent and the content of the fluorine-free waterproof agent on the effect characteristics of the composite protective film formed on the surfaces of various kinds of paper of the final paper document, and the obtained test results are shown in the table I.
Watch 1
| UV-screening agent content (%) | UV absorber content (%) | Content of fluorine-free Water repellent (%) | Water-proof property | UPF | Air permeability (mm/s) |
| 0.05 | 0.1 | 10 | The contact angle is 150 degrees, and the rolling angle is 5 degrees | 617 | 8 |
| 5 | 0.1 | 10 | The contact angle is 165 degrees, and the rolling angle is 3 degrees | 1490 | 15 |
| 10 | 0.1 | 10 | Contact angle of 155 deg., rolling angle of 4 deg | 1500 | 20 |
| 5 | 6 | 10 | The contact angle is 160 degrees and the rolling angle is 4 degrees | 1800 | 18 |
| 5 | 15 | 10 | The contact angle is 150 degrees, and the rolling angle is 5 degrees | 1627 | 12 |
From the data shown in the table, it is understood that the composite protective film is best in all of water repellency, ultraviolet resistance and air permeability when the uv blocking agent content, uv absorbing agent content and fluorine-free water repellent content are 5%, 0.1% and 10%, respectively.
In summary, in the method for protecting a paper document by using an electrospun fiber membrane provided by the present invention, an electrospun fiber membrane is formed by directly electrospinning an electrospun solution configured by an ultraviolet shielding agent (inorganic anti-ultraviolet agent) with the surface of various papers of the paper document as a receiving substrate, and an electrostatic spraying protective film is further formed by electrostatically spraying an electrostatic spraying solution configured by a fluorine-free water repellent and an ultraviolet absorbent (organic anti-ultraviolet agent) on the surface of the electrospun fiber membrane, so that the surface of various papers of the paper document is closely attached with an inorganic-organic composite waterproof breathable anti-ultraviolet thin film material, the thin film material has a multi-stage rough structure, and the obtained thin film material has good superhydrophobicity by combining the modification of the fluorine-free water repellent: the contact angle is more than or equal to 150 degrees, the rolling angle is less than or equal to 5 degrees, the aim of increasing the ultraviolet resistance effect by inorganic-organic compounding is realized through the double action of the ultraviolet shielding agent and the ultraviolet absorbent, the Ultraviolet Protection Factor (UPF) of the film material is more than or equal to 1500, the film material also keeps better air permeability (more than or equal to 10 mm/s), the film material with the waterproof, air permeability and ultraviolet resistance properties also has good tailorability and easy usability, has wide application potential in the fields of paper document protection, important archive storage and the like, adopts more environment-friendly physical reinforcement to perform film reinforcement on the surface of the paper cultural relic, and has less pollution to the environment.
While the invention has been described in detail in the foregoing by way of general description, and specific embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.
Claims (4)
1. A method for protecting a paper document by adopting an electrostatic spinning fiber membrane is applied to the paper document, and is characterized by comprising the following steps:
adding an ultraviolet shielding agent into a first container containing an ultraviolet shielding agent solvent, carrying out ultrasonic treatment for 1-20 hours to obtain an ultraviolet shielding agent solution, and adding the ultraviolet shielding agent solution into a high-molecular polymer solution, and mechanically stirring for 3-24 hours to obtain an electrostatic spinning solution;
adding a fluorine-free waterproof agent and an ultraviolet absorbent into a second container containing a fluorine-free waterproof agent solvent and an ultraviolet absorbent solvent, and mechanically stirring for 3-24 hours to prepare an electrostatic spraying solution;
for each paper included in the paper document, taking the paper as a receiving base material, and sending the electrostatic spinning solution into an electrostatic spinning device for electrostatic spinning, so that electrostatic spinning fibers obtained in the electrostatic spinning process are deposited on the surface of the paper to form an electrostatic spinning fiber film;
sending the electrostatic spraying solution into an electrostatic spraying device for electrostatic spraying by taking the electrostatic spinning fiber membrane as a receiving base material, so that the electrostatic spraying solution is deposited on the surface of the electrostatic spinning fiber membrane to form an electrostatic spraying protective film;
the paper document, the electrostatic spinning fiber membrane and the electrostatic spraying protective film are jointly sent into a vacuum oven for physical heating, the heating temperature is 40-70 ℃, the heating time is 2-10 hours, so that a composite protective film formed by the electrostatic spinning fiber membrane and the electrostatic spraying protective film is fixed on various papers in the paper document, and the film structure of the composite protective film has a multi-stage rough structure;
the ultraviolet shielding agent is at least one of zinc oxide, titanium dioxide, aluminum oxide and magnesium oxide, the ultraviolet absorbent is at least one of salicylic acid esters, benzophenone derivatives, benzotriazole and cinnamate polymers, the fluorine-free waterproof agent is at least one of polysiloxane, amino silicone oil, hyperbranched dendritic macromolecular polymer and long-chain alkane waterproof agent, and the content ratio of the ultraviolet shielding agent to the ultraviolet absorbent to the fluorine-free waterproof agent is 5wt%, 0.1wt% and 10wt% respectively.
2. The method according to claim 1, wherein the high molecular polymer in the high molecular polymer solution is at least one of polyacrylonitrile, polyurethane, polyvinylidene fluoride, polyethersulfone, aramid, nylon 6, nylon 66, polystyrene, and polylactic acid.
3. The method according to claim 1, wherein the electrostatic spraying process uses a voltage of 30 to 120kV, a receiving distance of 5 to 60cm, a temperature of 15 to 30 ℃ and a relative humidity of 20 to 90%.
4. The method of claim 1, further comprising:
and air-drying the surface of the composite protective film of each paper in the paper document by using air blowing equipment, and removing the residual solvent on the surface of the composite protective film.
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| CN109750417A (en) * | 2019-01-31 | 2019-05-14 | 青岛大学 | Electrospinning treatment process in situ for paper relics protection |
| CN110438659A (en) * | 2019-07-06 | 2019-11-12 | 欧名龙 | A kind of preparation method of Waterproof Breathable nano-fiber composite film |
| CN111424375A (en) * | 2020-03-11 | 2020-07-17 | 复旦大学 | Alkaline oxide/polymer composite film for paper protection and preparation method thereof |
| CN112941954A (en) * | 2021-01-25 | 2021-06-11 | 杭州众材科技有限公司 | Protective method suitable for preventive acidification resistance of paper |
| CN113463388B (en) * | 2021-07-20 | 2023-05-23 | 华南理工大学 | Inorganic/high polymer composite film for preventive protection of paper cultural relics and preparation method thereof |
| CN113774517A (en) * | 2021-08-06 | 2021-12-10 | 华南理工大学 | Composite fiber membrane for preventive protection of paper cultural relics and preparation method thereof |
| CN118147823A (en) * | 2024-05-11 | 2024-06-07 | 张家港市宏裕新材料有限公司 | Production process of nano PU fiber waterproof breathable film |
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