CN115612139A - Transparent and haze-adjustable aramid nanofiber membrane and preparation method and application thereof - Google Patents
Transparent and haze-adjustable aramid nanofiber membrane and preparation method and application thereof Download PDFInfo
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- CN115612139A CN115612139A CN202211353457.1A CN202211353457A CN115612139A CN 115612139 A CN115612139 A CN 115612139A CN 202211353457 A CN202211353457 A CN 202211353457A CN 115612139 A CN115612139 A CN 115612139A
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- 239000002121 nanofiber Substances 0.000 title claims abstract description 100
- 239000004760 aramid Substances 0.000 title claims abstract description 90
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 89
- 239000012528 membrane Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 135
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 91
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000006185 dispersion Substances 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 21
- 239000000017 hydrogel Substances 0.000 claims abstract description 18
- 239000000499 gel Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- 230000001112 coagulating effect Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000008929 regeneration Effects 0.000 claims abstract description 10
- 238000011069 regeneration method Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000002834 transmittance Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 230000015271 coagulation Effects 0.000 claims description 22
- 238000005345 coagulation Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 2
- 238000005286 illumination Methods 0.000 abstract description 6
- 230000006750 UV protection Effects 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 8
- 239000004677 Nylon Substances 0.000 description 7
- 229920001778 nylon Polymers 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 239000012296 anti-solvent Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000005595 deprotonation Effects 0.000 description 1
- 238000010537 deprotonation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
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- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
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Abstract
The invention discloses a transparent and haze-adjustable aramid nano-fiber membrane and a preparation method and application thereof, and particularly relates to an aramid nano-fiber membrane which is prepared by mixing aramid fiber, potassium hydroxide and dimethyl sulfoxide, continuously stirring to obtain an aramid nano-fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid, defoaming and shaping the dispersion liquid, then placing the dispersion liquid in a coagulating bath of ethanol and/or aqueous solution for regeneration, repeatedly washing the dispersion liquid with water or ethanol, removing residual potassium hydroxide and dimethyl sulfoxide in gel to obtain the aramid nano-fiber alcohol/hydrogel, and drying at normal temperature to obtain the aramid nano-fiber membrane. The transparent aramid nanofiber membrane with the characteristics of ultraviolet resistance and adjustable haze, which is prepared by the invention, has the transmittance of more than 60% at the visible light wavelength of 800 nm and the haze of 20-100% at the wavelength of 400-800 nm, has the capability of completely blocking UVA and UVB, and can be applied to the fields of illumination and buildings.
Description
Technical Field
The invention belongs to the technical field of new energy materials, and particularly relates to a transparent and haze-adjustable aramid nanofiber membrane as well as a preparation method and application thereof.
Background
Aramid fiber has excellent properties such as high strength, low density, high modulus, ultraviolet resistance, high temperature resistance, corrosion resistance and the like, and is widely applied to various fields such as communication, national defense, aviation and the like. However, the aramid fiber has good regularity, high crystallinity and a lack of active groups on the surface, so that the aramid fiber is weakly combined with a matrix, and the application of the aramid fiber in a composite material is severely limited. In 2011, a subject group of professor Kotov of michigan university firstly adopts a deprotonation method, namely an alkali dissolution method, to prepare Aramid Nanofibers (ANFs). The ANFs have the diameter of dozens of nanometers, the length of several micrometers, and a high length-diameter ratio, so that the characteristics of the aramid fibers are inherited, and the characteristics of the nano materials are also realized. In addition, the ANFs contain a large number of benzene rings and amide groups in the skeleton structure, and have excellent ultraviolet shielding performance.
Through research on a large number of documents, it is found that in the prior art, before the aramid nano-fiber film is prepared, the ANFs is usually precipitated from an ANFs/KOH/DMSO stock solution by adding anti-solvent water or ethanol, and then the aramid nano-fiber film is obtained through vacuum filtration.
Therefore, the development of the transparent aramid nanofiber membrane which is adjustable in haze, simple in production method and capable of realizing continuous production is of great significance.
Disclosure of Invention
Aiming at the problems, the invention provides the transparent and haze-adjustable aramid nano-fiber film and the preparation method and application thereof, the batch production of the aramid nano-fiber film is realized by adopting a sol-gel method, and the transparent and haze-adjustable and ultraviolet-resistant aramid nano-fiber film is prepared by controlling the coagulation bath conditions and can be applied to the fields of illumination and buildings.
The invention is realized by the following technical scheme:
a preparation method of a transparent and haze-adjustable aramid nanofiber membrane comprises the following steps:
(1) Mixing aramid fiber, potassium hydroxide and dimethyl sulfoxide, and stirring to react to obtain an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) After defoaming and shaping the dispersion liquid in the step (1), placing the dispersion liquid in a coagulating bath of ethanol and/or water solution for regeneration, repeatedly washing the dispersion liquid with water or ethanol, and removing residual potassium hydroxide and dimethyl sulfoxide in gel to obtain aramid nano-fiber alcohol/hydrogel;
(3) And drying the aramid nanofiber alcohol/hydrogel by adopting a normal-temperature drying method to obtain the transparent aramid nanofiber membrane.
Preferably, the mass ratio of the aramid fiber, the potassium hydroxide and the dimethyl sulfoxide in the step (1) is 1~2:1~3:50 to 100.
Preferably, the reaction conditions in the step (1) are 20 to 60 ℃, and the reaction time is 30 to 40h.
Preferably, the temperature of the coagulation bath in the step (2) is 5 to 50 ℃, and the time interval for changing the coagulation bath is 0.5 to 24h.
Preferably, the concentration of the ethanol in the step (2) is 0 to 100 percent.
Preferably, in the forming method in the step (2), the aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid is placed into a mold for forming, or is extruded for forming, or is dripped into a coagulating bath.
According to the transparent aramid nano-fiber film with adjustable haze, which is prepared by the preparation method, the transmittance of the transparent aramid nano-fiber film with adjustable haze at the visible light wavelength of 800 nm is more than 60%, the haze is 20-100% between the wavelengths of 400-800 nm, and UVA and UVB are blocked.
The transparent aramid nanofiber membrane with adjustable haze can be applied to the fields of buildings and illumination.
Advantageous effects
(1) The invention provides a preparation method which is simple in preparation process and can continuously produce a transparent, uvioresistant and haze-adjustable aramid fiber nanofiber membrane, and is different from the traditional method that the aramid fiber nanofiber is precipitated and then is subjected to suction filtration, the method adopts a sol-gel method to directly prepare the aramid fiber nanofiber membrane by regenerating and drying the aramid fiber nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid, and the steps are simpler and the cost is lower;
(2) The transparent aramid nanofiber membrane with the characteristics of transparency, ultraviolet resistance and adjustable haze can be prepared by the method, the transmittance of the transparent aramid nanofiber membrane at the visible light wavelength of 800 nm is more than 60%, the haze of the transparent aramid nanofiber membrane at the wavelength of 400-800 nm is 20-100%, the transparent aramid nanofiber membrane has the capability of completely blocking UVA and UVB, and can be applied to the fields of illumination and buildings.
Drawings
Fig. 1 is a Scanning Electron Microscope (SEM) image of an aramid nanofiber gel of the present invention;
FIG. 2 is an optical picture of an aramid nanofiber membrane of the present invention;
FIG. 3 is a UV-visible spectrum of the aramid nanofiber membrane of the present invention;
FIG. 4 is the haze results for the aramid nanofiber film of the present invention;
FIG. 5 is a diagram of the application of the aramid nanofiber membrane of the present invention in the field of practical LED lighting;
fig. 6 is an application diagram of the aramid nanofiber membrane of the invention in the field of actual simulation of buildings.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that the following examples are illustrative of the practice of the invention and are not intended to limit the operation and scope of the invention described, and that such modifications are intended to be included within the scope of the appended claims.
Example 1
(1) Adding 5g of aramid fiber and 7.5g of potassium hydroxide into 250 g dimethyl sulfoxide, mechanically stirring at 25 ℃ for 36h to form an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) Defoaming the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid in the step (1), pouring the dispersion liquid onto a glass plate, putting the glass plate into a coagulation bath of a deionized solution for regeneration, wherein the temperature of the coagulation bath is 25 ℃, the time interval for replacing the coagulation bath is 6h, repeatedly washing the glass plate with deionized water, and removing redundant potassium hydroxide and dimethyl sulfoxide in gel to obtain the aramid nano fiber hydrogel;
(3) And (3) drying the nylon nanofiber hydrogel in the step (2) at normal pressure to obtain the transparent aramid nanofiber membrane.
Example 2
(1) Adding 5g of aramid fiber and 7.5g of potassium hydroxide into 250 g dimethyl sulfoxide, and mechanically stirring at the temperature of 30 ℃ for 35 h to form an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) Defoaming the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid in the step (1), pouring the dispersion liquid onto a glass plate, putting the glass plate into a coagulation bath of 25v/v% ethanol water solution for regeneration, wherein the temperature of the coagulation bath is 25 ℃, the time interval for replacing the coagulation bath is 12 hours, then repeatedly washing with deionized water, and removing redundant potassium hydroxide and dimethyl sulfoxide in gel to obtain the aramid nano fiber hydrogel;
(3) And (3) drying the nylon nanofiber hydrogel in the step (2) at normal pressure to obtain the transparent aramid nanofiber membrane.
Example 3
(1) Adding 5g of aramid fiber and 7.5g of potassium hydroxide into 250 g dimethyl sulfoxide, mechanically stirring at 30 ℃ for 36h to form an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) Defoaming the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid in the step (1), pouring the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid onto a glass plate, putting the glass plate into a coagulation bath of 50v/v% ethanol solution for regeneration, wherein the temperature of the coagulation bath is 25 ℃, the time interval for replacing the coagulation bath is 24h, then repeatedly washing with deionized water, and removing redundant potassium hydroxide and dimethyl sulfoxide in gel to obtain the aramid nano fiber hydrogel;
(3) And (3) drying the nylon nanofiber hydrogel in the step (2) at normal pressure to obtain the transparent aramid nanofiber membrane.
Example 4
(1) Adding 5g of aramid fiber and 7.5g of potassium hydroxide into 250 g dimethyl sulfoxide, mechanically stirring at 25 ℃ for 36h to form an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) Defoaming the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid in the step (1), pouring the dispersion liquid onto a glass plate, putting the glass plate into a coagulation bath of 75v/v% ethanol water solution for regeneration, wherein the temperature of the coagulation bath is 25 ℃, the time interval for replacing the coagulation bath is 24 hours, then repeatedly washing with deionized water, and removing redundant potassium hydroxide and dimethyl sulfoxide in gel to obtain the aramid nano fiber hydrogel;
(3) And (3) drying the nylon nanofiber hydrogel in the step (2) at normal pressure to obtain the transparent aramid nanofiber membrane.
Example 5
(1) Adding 5g of aramid fiber and 7.5g of potassium hydroxide into 250 g dimethyl sulfoxide, and mechanically stirring at 25 ℃ for 40h to form an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) Defoaming the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid in the step (1), pouring the dispersion liquid on a glass plate, putting the glass plate into a coagulating bath of an ethanol solution for regeneration, wherein the temperature of the coagulating bath is 25 ℃, the time interval for replacing the coagulating bath is 24 hours, repeatedly washing the glass plate with ethanol, and removing redundant potassium hydroxide and dimethyl sulfoxide in gel to obtain the aramid nano fiber hydrogel;
(3) And (3) drying the nylon nanofiber hydrogel in the step (2) at normal pressure to obtain the transparent aramid nanofiber membrane.
Example 6
(1) Adding 5g of aramid fiber and 7.5g of potassium hydroxide into 250 g dimethyl sulfoxide, and mechanically stirring at 25 ℃ for 40h to form an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) Defoaming the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid in the step (1), pouring the dispersion liquid onto a glass plate, putting the glass plate into a coagulating bath of an ethanol solution for regeneration, wherein the temperature of the coagulating bath is 25 ℃, the time interval for replacing the coagulating bath is 24h, repeatedly washing the glass plate with ethanol, and removing redundant potassium hydroxide and dimethyl sulfoxide in gel to obtain the aramid nano fiber hydrogel;
(3) And (3) drying the nylon nanofiber hydrogel in the step (2) at normal pressure to obtain the transparent aramid nanofiber membrane.
Example 7
(1) Adding 5g of aramid fiber and 7.5g of potassium hydroxide into 250 g dimethyl sulfoxide, and mechanically stirring at 25 ℃ for 36 hours to form an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) Defoaming the aramid nano fiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid in the step (1), pouring the dispersion liquid onto a glass plate, putting the glass plate into a coagulation bath of a deionized water coagulation solution for regeneration, wherein the temperature of the coagulation bath is 25 ℃, the time interval for replacing the coagulation bath is 6 hours, washing with ethanol repeatedly, and removing redundant potassium hydroxide and dimethyl sulfoxide in gel to obtain aramid nano fiber alcogel;
(3) And (3) drying the nylon nanofiber hydrogel in the step (2) at normal pressure to obtain the transparent aramid nanofiber membrane.
Relevant testing of aramid nanofiber membranes:
(1) The aramid nanofiber gels prepared in the examples are observed under a Scanning Electron Microscope (SEM), and SEM images of the aramid nanofiber gels prepared in the examples 1, 5, 6 and 7 are shown in fig. 1, and it can be seen from fig. 1 that different coagulation bath conditions result in different gel structures;
(2) The aramid nanofiber film prepared in example 1~5 was analyzed for transparency, flexibility and haze, and the results are shown in fig. 2, as can be seen from fig. 2, the aramid nanofiber film prepared by the present invention is transparent, flexible and adjustable in haze, and the haze increases with the increase of ethanol content;
(3) As shown in fig. 3, the ultraviolet and visible light absorption performance of the aramid nanofiber film prepared in example 1~5 is detected, and as can be seen from fig. 3, the aramid nanofiber film prepared by the invention can completely block UVA and UVB, has good ultraviolet resistance, has a transmittance of more than 60% at a visible light wavelength of 800 nm, and has good transparency;
(4) The haze of the aramid nanofiber film prepared in example 1~5 is detected, and the result is shown in fig. 4, as can be seen from fig. 4, the aramid nanofiber film prepared by the method disclosed by the invention has the advantages that the haze is between 20 and 100% within the wavelength range of 400 to 800 nm, and the haze is adjustable;
(5) Practical and potential applications of the aramid nanofiber films prepared in the embodiments 1 and 5 are studied, and an application diagram of the aramid nanofiber films in the field of illumination is shown in fig. 5, and it can be known from fig. 5 that the transmission path of light can be adjusted by applying the aramid nanofiber films on the premise of not changing the structure of an LED device, so that the purposes of preventing glare and the like are achieved, and the aramid nanofiber films with different haze have different influences on light;
an application diagram of the aramid nanofiber membrane prepared in the embodiment 1 in the field of buildings is shown in fig. 6, and it can be known from fig. 6 that the aramid nanofiber membrane is coated on the surface of glass of a house, so that the purposes of ultraviolet resistance and illumination area increase are achieved, furniture is protected, resources are saved, and a low-carbon society is served.
Claims (9)
1. A preparation method of a transparent aramid nanofiber membrane with adjustable haze is characterized by comprising the following steps:
(1) Mixing aramid fiber, potassium hydroxide and dimethyl sulfoxide, and continuously stirring to obtain an aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion liquid;
(2) After defoaming and shaping the dispersion liquid in the step (1), placing the dispersion liquid in a coagulating bath of ethanol and/or water solution for regeneration, repeatedly washing the dispersion liquid with water or ethanol, and removing residual potassium hydroxide and dimethyl sulfoxide in gel to obtain aramid nano-fiber alcohol/hydrogel;
(3) And drying the aramid nanofiber alcohol/hydrogel by adopting a normal-temperature drying method to obtain the transparent aramid nanofiber membrane.
2. The preparation method of claim 1, wherein the mass ratio of the aramid fiber, the potassium hydroxide and the dimethyl sulfoxide in the step (1) is 1~2:1~3:50 to 100.
3. The method according to claim 1, wherein the reaction conditions in step (1) are 20 to 60 ℃ and the reaction time is 30 to 40h.
4. The method of claim 1, wherein the temperature of the coagulation bath in the step (2) is 5 to 50 ℃, and the time interval for changing the coagulation bath is 0.5 to 24h.
5. The method according to claim 1, wherein the concentration of ethanol in step (2) is 0 to 100%.
6. The preparation method according to claim 1, wherein the molding method in step (2) is to put the aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion into a mold for molding, or to extrude or drop the aramid nanofiber/potassium hydroxide/dimethyl sulfoxide dispersion into a coagulating bath.
7. A transparent and haze-adjustable aramid nanofiber film prepared by the preparation method of any one of claims 1~6.
8. The transparent aramid nanofiber film with the adjustable haze as claimed in claim 7, wherein the transmittance at the visible light wavelength of 800 nm is more than 60%, the haze between 400 nm and 800 nm is 20 to 100%, and UVA and UVB are blocked.
9. The application of the transparent aramid nanofiber membrane with adjustable haze as claimed in claim 8, which is used in the fields of building and lighting.
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| WO2019192540A1 (en) * | 2018-04-04 | 2019-10-10 | 京工新能(北京)科技有限责任公司 | Aromatic polyamide microporous membrane, and preparation method and use thereof |
| CN112409613A (en) * | 2020-11-19 | 2021-02-26 | 陕西科技大学 | Preparation method of aramid nanofiber dispersion liquid |
| CN112795035A (en) * | 2020-12-31 | 2021-05-14 | 齐鲁工业大学 | Cellulose/aramid nano-fiber composite membrane and preparation method and application thereof |
| CN115073803A (en) * | 2022-07-08 | 2022-09-20 | 东华大学 | High-toughness aramid aerogel fiber and preparation method and application thereof |
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- 2022-11-01 CN CN202211353457.1A patent/CN115612139A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019192540A1 (en) * | 2018-04-04 | 2019-10-10 | 京工新能(北京)科技有限责任公司 | Aromatic polyamide microporous membrane, and preparation method and use thereof |
| CN109608686A (en) * | 2018-12-18 | 2019-04-12 | 中国科学院苏州纳米技术与纳米仿生研究所 | Kevlar aerogel, preparation method and application |
| CN112409613A (en) * | 2020-11-19 | 2021-02-26 | 陕西科技大学 | Preparation method of aramid nanofiber dispersion liquid |
| CN112795035A (en) * | 2020-12-31 | 2021-05-14 | 齐鲁工业大学 | Cellulose/aramid nano-fiber composite membrane and preparation method and application thereof |
| CN115073803A (en) * | 2022-07-08 | 2022-09-20 | 东华大学 | High-toughness aramid aerogel fiber and preparation method and application thereof |
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Application publication date: 20230117 |