CN114775267A - Electromagnetic shielding non-woven fabric and preparation method thereof - Google Patents
Electromagnetic shielding non-woven fabric and preparation method thereof Download PDFInfo
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- CN114775267A CN114775267A CN202210383013.6A CN202210383013A CN114775267A CN 114775267 A CN114775267 A CN 114775267A CN 202210383013 A CN202210383013 A CN 202210383013A CN 114775267 A CN114775267 A CN 114775267A
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- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 38
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 38
- 239000006185 dispersion Substances 0.000 claims abstract description 29
- 229920001690 polydopamine Polymers 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000006247 magnetic powder Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000004750 melt-blown nonwoven Substances 0.000 claims abstract description 9
- 239000004744 fabric Substances 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 23
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 18
- 238000011282 treatment Methods 0.000 claims description 16
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 16
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000004743 Polypropylene Substances 0.000 claims description 12
- 229920001155 polypropylene Polymers 0.000 claims description 12
- -1 polypropylene Polymers 0.000 claims description 11
- 238000006116 polymerization reaction Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims description 9
- 229960003638 dopamine Drugs 0.000 claims description 9
- 229960001149 dopamine hydrochloride Drugs 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000007983 Tris buffer Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 8
- 238000000498 ball milling Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 6
- 238000004049 embossing Methods 0.000 claims description 6
- 230000020477 pH reduction Effects 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000004626 polylactic acid Substances 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 230000000379 polymerizing effect Effects 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims 1
- 229910017052 cobalt Inorganic materials 0.000 claims 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 238000012986 modification Methods 0.000 abstract description 7
- 230000004048 modification Effects 0.000 abstract description 7
- 230000003592 biomimetic effect Effects 0.000 abstract description 6
- 230000010062 adhesion mechanism Effects 0.000 abstract 1
- 238000005470 impregnation Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 11
- 238000013016 damping Methods 0.000 description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 5
- 239000004594 Masterbatch (MB) Substances 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 4
- 239000007767 bonding agent Substances 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 241000237536 Mytilus edulis Species 0.000 description 2
- 229920002334 Spandex Polymers 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000001755 magnetron sputter deposition Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000020638 mussel Nutrition 0.000 description 2
- 239000004759 spandex Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- FYFFGSSZFBZTAH-UHFFFAOYSA-N methylaminomethanetriol Chemical compound CNC(O)(O)O FYFFGSSZFBZTAH-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/61—Polyamines polyimines
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/49—Oxides or hydroxides of elements of Groups 8, 9,10 or 18 of the Periodic Table; Ferrates; Cobaltates; Nickelates; Ruthenates; Osmates; Rhodates; Iridates; Palladates; Platinates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
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- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/38—Polyurethanes
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- Chemical Kinetics & Catalysis (AREA)
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- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention belongs to the technical field of non-woven fabrics, and discloses an electromagnetic shielding non-woven fabric and a preparation method thereof. Based on the adhesion mechanism of polydopamine, modifying carbon nanotubes and magnetic powder on the surface of a non-woven base fabric, specifically, firstly preparing melt-blown non-woven fabric and polydopamine solution, modifying polydopamine on the surface of the non-woven fabric through an impregnation method, then immersing the modified non-woven fabric into aqueous carbon nanotube dispersion liquid, and washing and drying for multiple times to obtain the electromagnetic shielding non-woven fabric based on polydopamine biomimetic modification. The method has the advantages of simple and efficient process, cost saving, low equipment requirement, light and soft product, water washing resistance and excellent electromagnetic shielding property, and can be widely applied to the fields of individual protection, military safety and the like.
Description
Technical Field
The invention belongs to the technical field of non-woven fabrics, and particularly relates to an electromagnetic shielding non-woven fabric and a preparation method thereof.
Background
With the development of science and technology, various electronic products such as high-energy rays (such as mobile phones, computers and microwave ovens) are widely applied, and the cumulative effect and the thermal effect generated by electromagnetic radiation can cause serious harm to human health. In addition, when the electromagnetic wave radiation reaches a certain intensity, not only can serious threat to the health of people be caused, but also the control of electronic equipment which normally works can be disabled and the like.
Common preparation methods of the electromagnetic shielding non-woven fabric comprise a dipping method, a coating method, a metal blending method, a chemical plating method, a magnetron sputtering method and the like, and materials with excellent conductive performance, such as metal, carbon nano tubes, graphene and the like, are used for modifying the fabric so as to prepare the soft, light and durable high electromagnetic shielding fabric. The invention patent with the application number of CN202011557998.7 discloses that a metal layer is deposited on a PET film after special treatment by using a magnetron sputtering or electroplating method, the shielding performance of a product is excellent, but the practical application is limited due to the complex process and higher equipment and production cost. Patent No. CN201811351811.0 discloses a method for preparing a carbon nanotube-modified nonwoven fabric by using an immersion method in combination with an ultrasonic method, but van der waals force between a fiber web and carbon nanotubes is weak, and the carbon nanotubes are easily detached, and the product obtained by this method has poor functional durability during use. The invention patent with the application number of CN202110537560.0 discloses a method for preparing an electromagnetic shielding composite material by coating conductive graphene ink on the surface of non-woven fabric through a dipping or spraying method and hot-pressing, the method is complex in process, various organic solvents are required, the production process is not environment-friendly, and the softness of the non-woven fabric after hot pressing is poor.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, a first object of the present invention is to provide a method for preparing an electromagnetic shielding nonwoven fabric; the second purpose of the invention is to provide electromagnetic shielding non-woven fabric prepared by the preparation method, and the non-woven fabric is mainly applied to electronic equipment protection, personal protection materials and the like.
The above purpose of the invention is realized by the following technical scheme:
a preparation method of electromagnetic shielding non-woven fabric comprises the following steps:
(1) feeding the fully dried polymer master batches or the chips into melt-blown non-woven equipment to prepare melt-blown non-woven fabric with uniform thickness;
(2) at normal temperature, putting trihydroxymethyl aminomethane into a beaker, adding deionized water to prepare Tris buffer solution, adding dopamine hydrochloride after the pH value is stable, fully dissolving, and continuously polymerizing dopamine in the solution to form polydopamine;
(3) in the dopamine polymerization process, immersing the non-woven fabric into a polydopamine solution, and placing the polydopamine solution into a constant-temperature shaking box to be continuously shaken or placing the polydopamine solution into a stirrer to be continuously stirred;
(4) acidizing the carbon nano tube, simultaneously performing ball milling treatment on the magnetic powder, and then uniformly dispersing the carbon nano tube and the magnetic powder in water by using an ultrasonic dispersion method;
(5) the electromagnetic shielding non-woven fabric based on the poly dopamine biomimetic modification can be obtained by soaking the poly dopamine modified non-woven fabric in a dispersion liquid of Carbon Nano Tubes (CNT) and magnetic powder, taking out the poly dopamine modified non-woven fabric after the carbon nano tubes and the magnetic powder are completely adsorbed, placing the poly dopamine modified non-woven fabric into an oven for drying, and washing and drying the poly dopamine modified non-woven fabric for multiple times.
As a preferred technical solution of the present application, in the step (1), the polymer master batch or the polymer chip is any one or more high molecular polymer materials with a melting temperature lower than a decomposition temperature, such as at least one of polypropylene (PP), polyester, polyethylene, polylactic acid, Polyurethane (PU), polyamide, and the like, and is preferably polypropylene or polyurethane.
As a preferred technical solution of the present application, in the step (1), the melt-blowing process parameters are: the set temperature of the screw extruder was: the 1 region is 160-; the set temperature of the melt-blown die head is 220-240 ℃; the temperature of a metering pump during melt-blown spinning is 210-230 ℃, and the rotating speed of the metering pump is 6-8 r/min; the wind temperature of the drawing hot wind is divided into 210-230 ℃; the receiving distance is 20-30 cm; the moving speed of the net curtain is 0.3-0.8 m/min; the temperature of the smooth roller and the embossing roller is 80-100 ℃.
As a preferred technical scheme of the application, in the step (2), the pH value of the Tris buffer solution is 7.5-9, preferably 8.5-9, and the concentration of the dopamine hydrochloride is 1.5-2.5 g/L, preferably 1.6-1.8 g/L.
As a preferred technical scheme of the application, in the step (3), the shaking or stirring time is 8-24 hours, preferably 8-20 hours, and the temperature is 20-50 ℃, preferably 20-35 ℃.
As a preferred technical scheme of the application, in the step (4), the acidification treatment agent is at least one of hydrochloric acid, nitric acid, sulfuric acid and the like, the acidification time is 4-24 h, preferably 8h, and the acidification temperature is 70-180 ℃, preferably 80 ℃. The ultrasonic dispersion power is 300-1800W, the dispersion time is 5-30 min, and the dispersion temperature is 0-60 ℃, preferably 10-40 ℃. The mass fractions of the carbon nano tube and the magnetic powder dispersion liquid are respectively 0.5-10wt% and 10-50 wt%.
Preferably, the ultrasonic dispersion power is 1000W, the dispersion time is 10 min, and the dispersion temperature is 40 ℃.
Preferably, the mass fractions of the carbon nanotube and the magnetic powder dispersion are 3 to 5wt% and 10 to 40wt%, respectively.
As a preferred technical scheme of the application, in the step (5), the dipping time is 10-90 min, and the dipping temperature is 0-40 ℃.
Compared with the prior art, the invention has the advantages that:
the invention obtains inspiration from natural mussels, utilizes polydopamine with the chemical structure and the property similar to those of a bonding agent in the mussels as a bonding agent, firmly adheres the carbon nano tubes on the surface of the fiber and endows the non-woven fabric with excellent conductivity and electromagnetic shielding performance. Compared with the method of compounding the carbon nano tube and the fabric by means of electrostatic adsorption, lamination or hot pressing and the like, the method has the advantages that the poly-dopamine is used as a bonding agent between the carbon nano tube and the fabric, the bonding effect is stronger and more durable, the characteristics of light weight and softness of the non-woven fabric can be kept, and the shielding effect of the lamination is better. In addition, the method has simple and efficient preparation process flow, and reagents adopted in the preparation process are all water-based solutions, are safe and nontoxic, meet the sustainable requirements of environmental protection, and are beneficial to large-scale industrial production.
Drawings
FIG. 1 is a schematic view of the surface structure of a polypropylene nonwoven fiber produced by a melt-blowing method;
FIG. 2 is a structural view of the surface of a polypropylene nonwoven fabric treated with dopamine;
FIG. 3 is a schematic view of the surface of a polypropylene nonwoven fiber after carbon nanotube adhesion;
fig. 4 is a graph showing the shielding effectiveness of the electromagnetic shielding nonwoven fabric according to example 4 of the present invention (coaxial method, single layer thickness of 0.7-0.9 mm).
Detailed Description
The invention is described in more detail below with reference to specific examples, without limiting the scope of the invention. Unless otherwise specified, the experimental methods adopted by the invention are all conventional methods, and experimental equipment, materials, reagents and the like used in the experimental method can be obtained from commercial sources. The electromagnetic shielding effectiveness testing method comprises the steps of preparing, testing and calculating a sample according to a flange coaxial device method specified by GJB 6190-2008.
Example 1
A preparation method of electromagnetic shielding non-woven fabric comprises the following steps:
feeding the PP master batch after full drying into melt-blown non-woven equipment, wherein the set temperature of a screw extruder is as follows: 165 ℃ in a region 1, 190 ℃ in a region 2, 220 ℃ in a region 3, 225 ℃ in a region 4 and 230 ℃ in a region 5; the set temperature of the melt-blowing die head is 230 ℃; the temperature of a metering pump during melt-blown spinning is 220 ℃, and the rotating speed of the metering pump is 7 r/min; the wind temperature of the drawing hot wind is 220 ℃; the receiving distance is 25 cm; the moving speed of the net curtain is 0.5 m/min; the temperature of the smooth roller and the embossing roller is both 90 ℃; preparing melt-blown polypropylene fiber non-woven fabric with uniform thickness;
taking Tris (hydroxymethyl) aminomethane in a beaker, adding deionized water to prepare a Tris buffer solution, adding 1.8 g/ml dopamine hydrochloride after the pH value is stabilized at 9.0, continuously stirring to fully dissolve the Tris (hydroxymethyl) aminomethane and starting polymerization;
in the dopamine polymerization process, immersing the non-woven fabric into a polydopamine solution, and placing the polydopamine solution into a constant-temperature oscillation box to continuously oscillate, wherein the oscillation time is 20 hours, and the oscillation temperature is 20 ℃;
and (3) acidizing the carbon nano tube with hydrochloric acid for 6 hours at the acidizing temperature of 80 ℃. Meanwhile, ball milling treatment is carried out on ferroferric oxide, and then the carbon nano tube and the ferroferric oxide are uniformly dispersed in water by utilizing an ultrasonic dispersion method, wherein the ultrasonic dispersion power is 1000W, the dispersion time is 10 min, and the dispersion temperature is 40 ℃. Obtaining a dispersion liquid of CNT with the mass fraction of 4wt% and ferroferric oxide with the mass fraction of 10 wt%;
soaking the polydopamine-modified non-woven fabric in dispersion liquid of carbon nano tubes and ferroferric oxide, taking out the non-woven fabric after 30 min, and putting the non-woven fabric into an oven for drying treatment at the temperature of 60 ℃. And obtaining the electromagnetic shielding non-woven fabric based on the poly-dopamine biomimetic modification after multiple water washing-drying treatments.
Through tests, the electromagnetic wave damping effect of the electromagnetic shielding non-woven fabric reaches 20 dB, and after the electromagnetic shielding non-woven fabric is washed for 20 times, the electromagnetic wave damping effect is attenuated by less than 10%.
Example 2
A preparation method of electromagnetic shielding non-woven fabric comprises the following steps:
feeding the PP master batches after full drying into melt-blown non-woven equipment, wherein the set temperature of a screw extruder is as follows: zone 1 165 ℃, zone 2 190 ℃, zone 3, zone 220 ℃, zone 4, zone 225 ℃, zone 5 ℃ 230 ℃; the set temperature of the melt-blowing die head is 230 ℃; the temperature of a metering pump during melt-blown spinning is 220 ℃, and the rotating speed of the metering pump is 7 r/min; the air temperature of the drafting hot air is 220 ℃; the receiving distance is 25 cm; the moving speed of the net curtain is 0.5 m/min; the temperature of the smooth roller and the embossing roller is 90 ℃; preparing melt-blown polypropylene fiber non-woven fabric with uniform thickness;
taking Tris (hydroxymethyl) aminomethane in a beaker, adding deionized water to prepare a Tris buffer solution, adding 1.8 g/ml dopamine hydrochloride after the pH value is stabilized at 9.0, continuously stirring to fully dissolve the Tris (hydroxymethyl) aminomethane and starting polymerization;
in the dopamine polymerization process, immersing the non-woven fabric into a polydopamine solution, and placing the non-woven fabric into a stirrer to be continuously stirred, wherein the stirring temperature is 25 ℃, and the stirring time is 18 h;
and (3) acidizing the carbon nano tube with hydrochloric acid for 6 hours at the acidizing temperature of 80 ℃. Meanwhile, ball milling is carried out on nickel powder, then the carbon nano tube and the nickel powder are uniformly dispersed in water by utilizing an ultrasonic dispersion method, the ultrasonic dispersion power is 1000W, the dispersion time is 10 min, and the dispersion temperature is 20 ℃. Obtaining a dispersion liquid of CNT with the mass fraction of 4wt% and ferroferric oxide with the mass fraction of 20 wt%;
and (2) soaking the polydopamine-modified non-woven fabric in dispersion liquid of carbon nano tubes and nickel powder, taking out after 20 min, putting into an oven for drying treatment, wherein the temperature is 90 ℃. And after multiple water washing and drying treatments, obtaining the electromagnetic shielding non-woven fabric based on the poly dopamine biomimetic modification.
Tests show that the electromagnetic shielding non-woven fabric has the damping effect on electromagnetic waves up to 25 dB, and after being washed for 15 times, the damping effect on the electromagnetic waves is attenuated by less than 10%.
Example 3
A preparation method of electromagnetic shielding non-woven fabric comprises the following steps:
feeding the PU master batch after full drying into melt-blown non-woven equipment, wherein the set temperature of a screw extruder is as follows: zone 1 165 ℃, zone 2 190 ℃, zone 3, zone 220 ℃, zone 4, zone 225 ℃, zone 5 ℃ 230 ℃; the set temperature of the melt-blowing die head is 230 ℃; the temperature of a metering pump during melt-blown spinning is 220 ℃, and the rotating speed of the metering pump is 7 r/min; the wind temperature of the drawing hot wind is 220 ℃; the receiving distance is 25 cm; the moving speed of the net curtain is 0.5 m/min; the temperature of the smooth roller and the embossing roller is 90 ℃; preparing melt-blown spandex non-woven fabric with uniform thickness;
taking Tris (hydroxymethyl) aminomethane in a beaker, adding deionized water to prepare a Tris buffer solution, adding 1.8 g/ml dopamine hydrochloride after the pH value is stabilized at 8.5, continuously stirring to fully dissolve the Tris (hydroxymethyl) aminomethane and starting polymerization;
in the dopamine polymerization process, the non-woven fabric is immersed into a polydopamine solution, and is placed in a constant-temperature oscillation box to be continuously oscillated for 18 hours at the oscillation temperature of 20 ℃;
and (3) acidizing the carbon nano tube with hydrochloric acid for 6 hours at the acidizing temperature of 80 ℃. And simultaneously performing ball milling treatment on iron powder, and then uniformly dispersing the carbon nano tube and the iron powder in water by using an ultrasonic dispersion method, wherein the ultrasonic dispersion power is 1000W, the dispersion time is 10 min, and the dispersion temperature is 10 ℃. Obtaining a dispersion liquid of 5wt% of CNT and 30wt% of ferroferric oxide;
and (2) soaking the polydopamine-modified non-woven fabric in dispersion liquid of the carbon nano tubes and the iron powder, taking out the polydopamine-modified non-woven fabric after 30 min, and putting the polydopamine-modified non-woven fabric into an oven for drying treatment, wherein the drying temperature is 60 ℃. And obtaining the electromagnetic shielding non-woven fabric based on the poly-dopamine biomimetic modification after multiple water washing-drying treatments.
Through tests, the electromagnetic wave damping effect of the electromagnetic shielding non-woven fabric reaches 30 dB, and after the electromagnetic shielding non-woven fabric is washed for 20 times, the electromagnetic wave damping effect is attenuated by less than 15%.
Example 4
A preparation method of electromagnetic shielding non-woven fabric comprises the following steps:
feeding the PU master batch after full drying into melt-blown non-woven equipment, wherein the set temperature of a screw extruder is as follows: zone 1 165 ℃, zone 2 190 ℃, zone 3, zone 220 ℃, zone 4, zone 225 ℃, zone 5 ℃ 230 ℃; the set temperature of the melt-blowing die head is 230 ℃; the temperature of a metering pump during melt-blown spinning is 220 ℃, and the rotating speed of the metering pump is 7 r/min; the wind temperature of the drawing hot wind is 220 ℃; the receiving distance is 25 cm; the moving speed of the net curtain is 0.5 m/min; the temperature of the smooth roller and the embossing roller is 90 ℃; preparing melt-blown spandex non-woven fabric with uniform thickness;
taking Tris (hydroxymethyl) aminomethane in a beaker, adding deionized water to prepare a Tris buffer solution, adding 2.5g/ml dopamine hydrochloride after the pH value is stabilized at 8.5, continuously stirring to fully dissolve the dopamine hydrochloride and starting polymerization;
in the dopamine polymerization process, the non-woven fabric is immersed into a polydopamine solution, and is placed in a stirrer to be continuously stirred, wherein the stirring temperature is 35 ℃, and the stirring time is 8 hours;
acidizing the carbon nano tube by hydrochloric acid for 6 hours at 80 ℃. And simultaneously carrying out ball milling treatment on the iron powder, and then uniformly dispersing the carbon nano tube and the iron powder in water by using an ultrasonic dispersion method, wherein the ultrasonic dispersion power is 1000W, the dispersion time is 10 min, and the dispersion temperature is 40 ℃. Obtaining dispersion liquid of CNT with the mass fraction of 3 wt% and ferroferric oxide with the mass fraction of 40 wt%;
and soaking the polydopamine-modified non-woven fabric in a dispersion liquid of carbon nano tubes and iron powder, taking out the polydopamine-modified non-woven fabric after 30 min, and putting the polydopamine-modified non-woven fabric into an oven for drying treatment, wherein the drying temperature is 60 ℃. And obtaining the electromagnetic shielding non-woven fabric based on the poly-dopamine biomimetic modification after multiple water washing-drying treatments.
Tests show that the electromagnetic shielding non-woven fabric has the damping effect on electromagnetic waves up to 25 dB, and after being washed for 15 times, the damping effect on the electromagnetic waves is attenuated by less than 20%.
The embodiments described above are merely preferred embodiments of the invention, rather than all possible embodiments of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (10)
1. The preparation method of the electromagnetic shielding non-woven fabric is characterized by comprising the following steps of:
(1) feeding the fully dried polymer master batches or slices into melt-blown non-woven equipment to prepare melt-blown non-woven fabric with uniform thickness;
(2) taking Tris (hydroxymethyl) aminomethane in a container, adding deionized water to prepare a Tris buffer solution, adding dopamine hydrochloride after the pH value is stable, fully dissolving, and continuously polymerizing dopamine in the solution to form polydopamine;
(3) in the dopamine polymerization process, immersing the non-woven fabric into a polydopamine solution, and placing the polydopamine solution into a constant-temperature shaking box to be continuously shaken or placed into a stirrer to be continuously stirred;
(4) acidizing the carbon nano tube, simultaneously performing ball milling treatment on the magnetic powder, and then uniformly dispersing the carbon nano tube and the magnetic powder in water by using an ultrasonic dispersion method;
(5) soaking the poly dopamine-modified non-woven fabric in dispersion liquid of carbon nano tubes and magnetic powder, taking out the non-woven fabric after the carbon nano tubes and the magnetic powder are completely adsorbed, putting the non-woven fabric into an oven for drying, and washing and drying the non-woven fabric for multiple times to obtain the poly dopamine-modified electromagnetic shielding non-woven fabric.
2. The method for preparing an electromagnetic shielding non-woven fabric according to claim 1, wherein: in the step (1), the polymer master batches or the polymer chips are any one or more high molecular polymer materials with the melting temperature lower than the decomposition temperature, are selected from at least one of polypropylene, polyester, polyethylene, polylactic acid, polyurethane, polyamide and the like, and are preferably polypropylene or polyurethane.
3. The method for preparing an electromagnetic shielding nonwoven fabric according to claim 1 or 2, wherein in the step (1), the melt-blowing process parameters are: the set temperature of the screw extruder was: the 1 region is 160-; the set temperature of the melt-blowing die head is 230 ℃; the temperature of a metering pump during melt-blown spinning is 210-230 ℃, and the rotating speed of the metering pump is 6-8 r/min; the air temperature of the drafting hot air is 220 ℃; the receiving distance is 20-30 cm; the moving speed of the net curtain is 0.3-0.8 m/min; the temperature of the smooth roll and the embossing roll is 80-100 ℃.
4. A method for preparing an electromagnetic shielding nonwoven fabric according to any one of claims 1 to 3, wherein: in the step (2), the pH value of the Tris buffer solution is 7.5-9, preferably 8.5-9, and the concentration of the dopamine hydrochloride is 1.5-2.5 g/L, preferably 1.6-1.8 g/L.
5. The method for preparing an electromagnetic shielding nonwoven fabric according to claim 1, wherein: in the step (3), the shaking or stirring time is 8-24 h, preferably 8-20h, and the temperature is 20-50 ℃, preferably 20-35 ℃.
6. The method for preparing an electromagnetic shielding nonwoven fabric according to claim 1, wherein: in the step (4), the acidification treatment agent is at least one of hydrochloric acid, nitric acid, sulfuric acid and the like, the acidification time is 4-24 h, preferably 8h, and the acidification temperature is 70-180 ℃, preferably 80 ℃.
7. The method for preparing an electromagnetic shielding nonwoven fabric according to claim 1 or 6, wherein: in the step (4), the type of the magnetic powder is at least one of iron, cobalt, nickel and oxides thereof.
8. The method of claim 1 or 6, wherein the electromagnetic shielding nonwoven fabric is prepared by the following steps: in the step (4), the ultrasonic dispersion power is 300-1800W, the dispersion time is 5-30 min, and the dispersion temperature is 0-60 ℃, preferably 10-40 ℃; the mass fractions of the carbon nano tube and the magnetic powder dispersion liquid are respectively 0.5-10wt% and 10-50 wt%; preferably, the mass fractions of the carbon nanotube and the magnetic powder dispersion are 3 to 5wt% and 10 to 40wt%, respectively.
9. The method for preparing an electromagnetic shielding non-woven fabric according to claim 1, wherein: in the step (5), the dipping time is 10-90 min, and the dipping temperature is 0-40 ℃.
10. The non-woven fabric obtained by the method for preparing an electromagnetic shielding non-woven fabric according to any one of claims 1 to 9.
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| CN115652650A (en) * | 2022-10-22 | 2023-01-31 | 贵州省材料产业技术研究院 | Flexible electromagnetic shielding PVC composite film and preparation method thereof |
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| CN115652650B (en) * | 2022-10-22 | 2024-06-28 | 贵州省材料产业技术研究院 | Flexible electromagnetic shielding PVC composite film and preparation method thereof |
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