CN106003888B - A kind of flexible extensible electromagnetic shielding film and preparation method thereof - Google Patents
A kind of flexible extensible electromagnetic shielding film and preparation method thereof Download PDFInfo
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- CN106003888B CN106003888B CN201610352538.8A CN201610352538A CN106003888B CN 106003888 B CN106003888 B CN 106003888B CN 201610352538 A CN201610352538 A CN 201610352538A CN 106003888 B CN106003888 B CN 106003888B
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- H—ELECTRICITY
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
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Abstract
The present invention provides a kind of flexible extensible electromagnetic shielding films and preparation method thereof.The preparation method of the flexible extensible electromagnetic shielding film, comprising: select elastic membrane as elastic attachment matrix, fixed after being stretched to certain elongation, coat one layer of hydroelasticity adhesive in elastomeric film surface；By flexible nano electromagnetic shielding composite material pressure stain on hydroelasticity adhesive, in the upside of flexible nano electromagnetic shielding composite material, coating has the resin of protective effect, forms resin layer, makes hydroelasticity adhesive and resin solidification under certain condition；The pulling force being applied on elastic attachment matrix is discharged, so that it is driven flexible nano electromagnetic shielding composite material retraction, can be prepared by flexible extensible electromagnetic shielding film.Flexible extensible electromagnetic shielding film prepared by the present invention is with elasticity is good, elongation is high (20%-50%), electromagnetic shielding performance is excellent (in 1-5GHz frequency, 99% or more electromagnetic wave absorptivity), while centainly bending and compressive deformation can be born.
Description
Technical field
The present invention relates to electromagnetic shielding material fields, more specifically to flexible extensible electromagnetic shielding film field.
Background technique
With the rapid development of science and technology, electromagnetic wave obtains extensively in fields such as Aeronautics and Astronautics, communication, household electrical appliance, military affairs
Application, electromagnetic pollution problem is also outstanding day by day therewith.The electromagnetic energy of electromagnetic wave outside radiation is with annual 7%-14%
Speed increase, electromagnetism gets worse the pollution of environment.All over the world, various information networks transmit hundreds of millions of armies
The valuable information and information of thing, politics, economy etc., due to information-leakage event also Shi Youfa caused by electromagenetic wave radiation
It is raw, directly threaten national politics, economy, military security.Meanwhile electromagnetic wave also will cause weapon system failure, give operation band
Carry out serious hidden danger.It is therefore prevented that electromagenetic wave radiation, to ensure that information, weapons system security and human health become urgent
Task.
Many electromagnetic shielding materials are splashed, are coated by material surface metal-plated, pasted or by mixed currently on the market
The modes such as conductive fiber are spun, many problems are easy to appear during making and using, if metal and material binding ability are poor, are held
It is easy to fall off, coating is easy to be scratched and lose shielding properties, and preparation process is seriously polluted etc., and material is more thick and stiff, flexibility
Difference, it is airtight, handling property is poor, it is not wearable, and it is difficult needed for meeting modern electromagnetic shielding material " thin, light, wide, strong "
Characteristic, therefore, there is an urgent need to research and develop a kind of to have that high electromagnetic shielding performance, flexibility is good, frivolous, durability is good and wearable
Electromagnetic shielding material.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind to have high electromagnetic shielding performance, flexibility good, frivolous, resistance to
Long property is good and wearable flexible extensible electromagnetic shielding film and preparation method thereof.
In order to solve the above-mentioned technical problems, the present invention provides a kind of flexible extensible electromagnetic shielding films, which is characterized in that
It include: the elastic membrane set gradually from top to bottom, at least one layer of flexible nano electromagnetic shielding composite material and resin layer.
Preferably, the downside paste of the elastic membrane has biadhesive colloid.
The present invention also provides the preparation methods of above-mentioned flexible extensible electromagnetic shielding film characterized by comprising
Step 1: carbon nano-tube film is immersed in graphene suspension, taken out after handling a period of time, at room temperature certainly
It so dries, obtains flexible nano electromagnetic shielding composite material；
Step 2: selecting elastic membrane as elastic attachment matrix, and certain pulling force is applied to its both ends, is stretched to one
It is fixed after determining elongation, coats one layer of hydroelasticity adhesive in elastomeric film surface；
Step 3: the flexible nano electromagnetic shielding composite material that the first step is obtained presses stain on hydroelasticity adhesive,
The upside coating of flexible nano electromagnetic shielding composite material has the resin of protective effect, forms resin layer, makes under certain condition
Hydroelasticity adhesive and resin solidification, alternatively, bonding another elastic membrane in the upside of flexible nano electromagnetic shielding composite material；
Step 4: the pulling force that release is applied on elastic attachment matrix, makes it drive flexible nano electromagnetic shielding composite material
Retraction, can be prepared by flexible extensible electromagnetic shielding film.
Preferably, the first step further includes sticking electrode in the end of flexible nano electromagnetic shielding composite material.
It is highly preferred that the electrode is copper sheet, copper wire, conductive fiber or other conductive materials.
It is highly preferred that the conductive fiber is carbon nanotube yarn.
It is highly preferred that the electrode is connected by conductive silver glue with flexible nano electromagnetic shielding composite material.
Preferably, the carbon nano-tube film in the first step is made by single wall or multi-walled carbon nanotube, carbon nanotube diameter
For 10nm-100nm, film thickness is 10 μm -50 μm, porosity 35%-75%, tensile strength 100MPa-500MPa, conductance
Rate is 104-105S/m。
It is highly preferred that the size of the carbon nano-tube film in the first step is identical as the elastic attachment matrix after stretching.
Preferably, the concentration of the graphene suspension is 1mg/ml~50mg/ml, 1~5h of dip time, dipping 1
It~3 times, can design alternative as needed.
Preferably, the elastic membrane is polydimethylsiloxanefilm film, acrylate film, polyurethane film or high-elastic rubber
Glue film.
Preferably, the hydroelasticity adhesive is dimethyl silicone polymer, acrylic acid or polyurethane.
Preferably, the resin with protective effect is polyurethane, dimethyl silicone polymer or rubber.The painting of resin
Covering thickness can select as needed.
Preferably, the elongation in the second step is the 5~50% of the elongation at break of elastic membrane.
The conditions such as curing time, temperature, the pressure are determined by selected adhesive and resin.
Compared with prior art, the invention has the advantages that
(1) present invention is electromagnetically shielded as elastic attachment matrix, and while stretching with flexible nano using PDMS film
Film adhesive solidification, to improve the flexibility and elasticity of electromagnetic shielding film.
(2) present invention obtains flexible nano electricity with the carbon nano-tube film impregnated graphite alkene suspension of high electromagnetic shielding absorptivity
Magnetic screen composite membrane, electromagnetic performance is better than traditional material, while possessing biggish draw ratio again, has nanometer size effect, phase
For other metallic particles and graphite particle, have the characteristics that wide absorption band, multi-functional, light weight, thickness are thin, while also adopting
Its electromagnetic shielding performance is further improved with the mode of impregnated graphite alkene suspension.
(3) carbon nano-tube film is protected by the way of coated with resins, it is made to be not easy wear-out failure, and electromagnetic shielding performance is steady
It is fixed, improve the durability of material.
(4) should preparation method is simple, be suitble to industrialization promotion, be with a wide range of applications.
(5) the flexible extensible electromagnetic shielding film that the present invention is prepared is with elasticity is good, elongation height (20%-
50%), electromagnetic shielding performance is excellent (in 1-5GHz frequency, 99% or more electromagnetic wave absorptivity), while can bear centainly to be bent
And compressive deformation.The elasticity electromagnetic shielding film can be used in intelligent wearable garment and multifunction electromagnetic armored fabric, in army
It is had a wide range of applications with civilian intelligent protection field.
Detailed description of the invention
Fig. 1 is flexible extensible electromagnetic shielding film schematic diagram；
Fig. 2 is the elastic electromagnetic shielding film schematic diagram of superhigh shielded efficiency；
Fig. 3 is elastically stretchable electromagnetic shielding adhesive film schematic diagram.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiment 1: the stretchable electromagnetic shielding film of ultra-thin elastic
A kind of preparation method of flexible extensible electromagnetic shielding film, specific steps are as follows:
Step 1: carbon nano-tube film is immersed in graphene suspension, dip time 3h, impregnate 1 time, takes out, in room
The lower naturally dry of temperature, obtains flexible nano electromagnetic shielding composite material 2, and stick copper wire electrode by conductive silver glue at its both ends；
The carbon nano-tube film preferred dimension is 20 × 28cm2Carbon nano-tube film (Chinese Academy of Sciences Suzhou nanometer skill
Art and nano bionic research institute), it is made by multi-walled carbon nanotube, carbon nanotube diameter is 20nm or so, film thickness 20um, hole
Gap rate is 75%, and tensile strength is about 200MPa, conductivity about 1 × 105S/m；The concentration of the graphene suspension is
The graphene suspension (Niu Meitai new material Co., Ltd) of 2mg/ml.
Step 2: elastic membrane 1 is selected to be used as elastic attachment matrix, and certain pulling force is applied to its both ends, is stretched to
Certain elongation (the 40% of elongation at break) is fixed afterwards, and coating one layer of hydroelasticity adhesive on 1 surface of elastic membrane, (PDMS is viscous
Mixture), thickness is about 0.2mm；
The elastic membrane 1 is rectangular PDMS film, having a size of 20 × 20cm2, with a thickness of 0.3mm.PDMS film uses PDMS
Resin (Dow Corning Corporation DC184) is obtained by coating method.
The PDMS adhesive uses the SYLGARD184 of Dow Corning Corporation, by basic component (PDMS liquid, viscosity
5.2Pa-sec) it is uniformly mixed so as to obtain with curing agent (viscosity 3.5Pa-sec) by 10: 1 weight ratio.
Step 3: the flexible nano electromagnetic shielding composite material 2 that the first step is obtained presses stain on hydroelasticity adhesive,
The upside coating of flexible nano electromagnetic shielding composite material 2 has resin (water soluble polyurethane resin, the Bayer science and technology of protective effect
Co., Ltd, model: U54), resin layer 3 is formed, thickness is about 0.3mm, keeps the tensional state of elastic membrane 1, makes at 60 DEG C
Hydroelasticity adhesive and resin solidification, time are not less than 12 hours；
Step 4: the pulling force that release is applied on elastic attachment matrix, makes it drive flexible nano electromagnetic shielding composite material 2
Retraction, can be prepared by flexible extensible electromagnetic shielding film.
As shown in Figure 1, resulting flexible extensible electromagnetic shielding film includes: the elastic membrane 1, one set gradually from top to bottom
Layer flexible nano electromagnetic shielding composite material 2 and resin layer 3.
The stretchable electromagnetic shielding film of the ultra-thin elastic can absorb bandwidth, and electromagnet shield effect is high, in 1-5GHz frequency
Interior, 99% or more electromagnetic wave absorptivity, for shield effectiveness up to 35dB, the characteristic with " thin, light, wide, strong " can be used as a new generation
Flexible electromagnetic shielding material.
Embodiment 2: the elastic electromagnetic shielding film of superhigh shielded efficiency
A kind of preparation method of flexible extensible electromagnetic shielding film, specific steps are as follows:
Step 1: 3 carbon nano-tube films are immersed in graphene suspension respectively, dip time 3h, impregnate 1 time, take
Out, naturally dry at room temperature, obtains 3 layers of flexible nano electromagnetic shielding composite material 2, is led in one end of wherein two panels by coating
Electric elargol sticks copper wire electrode；
The carbon nano-tube film preferred dimension is 20 × 30cm2Carbon nano-tube film (Chinese Academy of Sciences Suzhou nanometer skill
Art and nano bionic research institute), it is made by multi-walled carbon nanotube, carbon nanotube diameter is 20nm or so, film thickness 20um, hole
Gap rate is 75%, and tensile strength is about 200MPa, conductivity about 1 × 105S/m；The concentration of the graphene suspension is
The graphene suspension (Niu Meitai new material Co., Ltd) of 2mg/ml.
Step 2: elastic membrane 1 is selected to be used as elastic attachment matrix, and certain pulling force is applied to its both ends, is stretched to
Certain elongation (the 50% of elongation at break) is fixed afterwards, and coating one layer of hydroelasticity adhesive on 1 surface of elastic membrane, (PDMS is viscous
Mixture), thickness is about 0.2mm；
The elastic membrane 1 is rectangular PDMS film, having a size of 20 × 20cm2, with a thickness of 0.4mm.PDMS film uses PDMS
Resin (Dow Corning Corporation DC184) is obtained by coating method.
The PDMS adhesive uses the SYLGARD184 of Dow Corning Corporation, by basic component (PDMS liquid, viscosity
5.2Pa-sec) it is uniformly mixed so as to obtain with curing agent (viscosity 3.5Pa-sec) by 10: 1 weight ratio.
Step 3: successively pressing stain to bond in hydroelasticity 3 layers of flexible nano electromagnetic shielding composite material 2 that the first step obtains
In agent, the flexible nano electromagnetic shielding composite material 2 of receiving with electrode is located at upper layer and lower layer, adjacent two layers flexible nano electromagnetic shielding
Adhesive phase 4 is formed between composite membrane 2；
Coating the resin with protective effect in the upside of the flexible nano electromagnetic shielding composite material 2 of top layer, (PDMS is viscous
Mixture, same to second step), resin layer 3 is formed, thickness is about 0.3mm, keeps the tensional state of elastic membrane 1, makes liquid at 80 DEG C
Elastic adhesive and resin solidification, time are not less than 12 hours；
Step 4: the pulling force that release is applied on elastic attachment matrix, makes it drive flexible nano electromagnetic shielding composite material 2
Retraction, can be prepared by flexible extensible electromagnetic shielding film.
As shown in Fig. 2, resulting flexible extensible electromagnetic shielding film includes: the elastic membrane 1, three set gradually from top to bottom
Layer flexible nano electromagnetic shielding composite material 2 and resin layer 3.
The elasticity electromagnetic shielding film uses 3 layers of nano electromagnetic and shields composite membrane, and shielding test result can reach 50dB, i.e.,
Shield effectiveness can be used as industry, military flexible electromagnetic shielding material, effectively prevent electromagenetic wave radiation and let out up to 99.999%
Dew, guarantees personal safety, and safeguards national information, politics, military security.
Embodiment 3: elastically stretchable electromagnetic shielding adhesive film
A kind of preparation method of flexible extensible electromagnetic shielding film, specific steps are as follows:
Step 1: carbon nano-tube film is immersed in graphene suspension, dip time 3h, impregnate 1 time, takes out, in room
The lower naturally dry of temperature, obtains flexible nano electromagnetic shielding composite material 2, and stick copper wire electrode by conductive silver glue at its both ends；
The carbon nano-tube film preferred dimension is 20 × 30cm2Carbon nano-tube film (Chinese Academy of Sciences Suzhou nanometer skill
Art and nano bionic research institute), it is made by multi-walled carbon nanotube, carbon nanotube diameter is 20nm or so, film thickness 20um, hole
Gap rate is 75%, and tensile strength is about 200MPa, conductivity about 1 × 105S/m；The concentration of the graphene suspension is
The graphene suspension (Niu Meitai new material Co., Ltd) of 2mg/ml.
Step 2: elastic membrane 1 is selected to be used as elastic attachment matrix, and certain pulling force is applied to its both ends, is stretched to
Certain elongation (the 40% of elongation at break) is fixed afterwards, and coating one layer of hydroelasticity adhesive on 1 surface of elastic membrane, (PDMS is viscous
Mixture), thickness is about 0.2mm；
The elastic membrane 1 is rectangular PDMS film, having a size of 20 × 20cm2, with a thickness of 0.4mm.PDMS film uses PDMS
Resin (Dow Corning Corporation DC184) is obtained by coating method.
The PDMS adhesive uses the SYLGARD184 of Dow Corning Corporation, by basic component (PDMS liquid, viscosity
5.2Pa-sec) it is uniformly mixed so as to obtain with curing agent (viscosity 3.5Pa-sec) by 10: 1 weight ratio.
Step 3: the flexible nano electromagnetic shielding composite material 2 that the first step is obtained presses stain on hydroelasticity adhesive,
The upside coating of flexible nano electromagnetic shielding composite material 2 has resin (water soluble polyurethane resin, the Bayer science and technology of protective effect
Co., Ltd, model: U54, thickness are about 0.3mm, keep the tensional state of elastic membrane 1, bond hydroelasticity at 60 DEG C
Agent and resin solidification, time are not less than 12 hours；
Step 4: the pulling force that release is applied on elastic attachment matrix, makes it drive flexible nano electromagnetic shielding composite material 2
Retraction adheres to one layer of biadhesive colloid 5 in the lower surface of elastic membrane 1, can be prepared by flexible extensible electromagnetic shielding film.
Acrylic transparent double face glue (the limited public affairs of the emerging composite material of Shanghai gem that the double-sided adhesive 4 is selected with a thickness of 0.5mm
Department).
As shown in figure 3, resulting flexible extensible electromagnetic shielding film includes: the elastic membrane 1, one set gradually from top to bottom
Layer flexible nano electromagnetic shielding composite material 2 and resin layer 3.The downside paste of the elastic membrane 1 has 5 (ruler of biadhesive colloid
Very little is 20 × 30cm2)。
The electromagnetic shielding adhesive film can be adhered to rapidly structure (such as tent, electromagnetic generator etc.) table for needing to shield
Face forms quick effectiveness.
The invention is not limited to above embodiment, above embodiment is only illustrative, and not restrictive, ability
The technical staff in domain under the inspiration of the present invention, can be in the case where not departing from present inventive concept and claimed range
A variety of forms are made, among these are all belonged to the scope of protection of the present invention.
Claims (9)
1. a kind of preparation method of flexible extensible electromagnetic shielding film, the flexible extensible electromagnetic shielding film include from it is lower to
On the elastic membrane (1), at least one layer of flexible nano electromagnetic shielding composite material (2) and the resin layer (3) that set gradually or another elasticity
Film (1) characterized by comprising
Step 1: carbon nano-tube film is immersed in graphene suspension, takes out after handling a period of time, dry in the air naturally at room temperature
It is dry, obtain flexible nano electromagnetic shielding composite material (2)；
Step 2: elastic membrane (1) is selected to be used as elastic attachment matrix, and certain pulling force is applied to its both ends, is stretched to one
It is fixed after determining elongation, coats one layer of hydroelasticity adhesive on elastic membrane (1) surface；The elongation is the disconnected of elastic membrane
Split the 5~50% of elongation；
Step 3: the flexible nano electromagnetic shielding composite material (2) that the first step is obtained presses stain on hydroelasticity adhesive, soft
Property nano electromagnetic shielding composite membrane (2) upside coating have protective effect resin, formed resin layer (3), in certain condition
Under make hydroelasticity adhesive and resin solidification, alternatively, bonding another bullet in the upside of flexible nano electromagnetic shielding composite material (2)
Property film (1)；
Step 4: the pulling force that release is applied on elastic attachment matrix, makes it that flexible nano electromagnetic shielding composite material (2) be driven to return
Contracting, can be prepared by flexible extensible electromagnetic shielding film, in 1-5GHz frequency, 99% or more electromagnetic wave absorptivity.
2. the preparation method of flexible extensible electromagnetic shielding film as described in claim 1, which is characterized in that the elastic membrane
(1) biadhesive colloid (5) are pasted on the downside of.
3. the preparation method of flexible extensible electromagnetic shielding film as claimed in claim 2, which is characterized in that the first step is also
Stick electrode in the end for being included in flexible nano electromagnetic shielding composite material (2).
4. the preparation method of flexible extensible electromagnetic shielding film as claimed in claim 3, which is characterized in that the electrode is logical
Conductive silver glue is crossed to be connected with flexible nano electromagnetic shielding composite material (2).
5. the preparation method of flexible extensible electromagnetic shielding film as claimed in claim 2, which is characterized in that in the first step
Carbon nano-tube film be made by single wall or multi-walled carbon nanotube, carbon nanotube diameter 10nm-100nm, film thickness be 10 μm -50
μm, porosity 35%-75%, tensile strength 100MPa-500MPa, conductivity 104-105S/m。
6. the preparation method of flexible extensible electromagnetic shielding film as claimed in claim 2, which is characterized in that the graphene
The concentration of suspension is 1mg/ml~50mg/ml, 1~5h of dip time, is impregnated 1~3 time.
7. the preparation method of flexible extensible electromagnetic shielding film as claimed in claim 2, which is characterized in that the elastic membrane
It (1) is polydimethylsiloxanefilm film, acrylate film, polyurethane film or elastomer film.
8. the preparation method of flexible extensible electromagnetic shielding film as claimed in claim 2, which is characterized in that the liquid shell
Property adhesive be dimethyl silicone polymer, acrylic acid or polyurethane.
9. the preparation method of flexible extensible electromagnetic shielding film as claimed in claim 2, which is characterized in that described having is protected
The resin of shield effect is polyurethane, dimethyl silicone polymer or rubber.
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| JP6883449B2 (en) * | 2017-03-13 | 2021-06-09 | Ｊｘ金属株式会社 | Electromagnetic wave shield material |
| CN107310211A (en) * | 2017-07-17 | 2017-11-03 | 合肥锦和信息技术有限公司 | A kind of notebook high heat radiation anti-radiation keyboard membrane and preparation method |
| KR102514334B1 (en) * | 2018-05-16 | 2023-03-27 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Shielding tape for electromagnetic wave |
| CN108882661B (en) * | 2018-06-25 | 2020-05-01 | 中国科学院深圳先进技术研究院 | Transparent flexible stretchable electromagnetic shielding film and preparation method thereof |
| JP6889412B2 (en) * | 2018-07-19 | 2021-06-18 | トヨタ自動車株式会社 | Non-aqueous electrolyte secondary battery, evaluation method of negative electrode mixture layer, and manufacturing method of non-aqueous electrolyte secondary battery |
| CN109628006A (en) * | 2018-12-18 | 2019-04-16 | 中国科学院苏州纳米技术与纳米仿生研究所 | A kind of carbon nanotube base electromagnetic screen material, adhesive tape and preparation method thereof |
| CN110310781A (en) * | 2019-06-18 | 2019-10-08 | 芜湖航天特种电缆厂股份有限公司 | The processing method of ribbon cable with shielded layer and sheath |
| CN110379544B (en) * | 2019-07-31 | 2024-09-06 | 广东南海启明光大科技有限公司 | Telescopic flexible conductive film and preparation method thereof |
| CN113752640A (en) * | 2021-09-10 | 2021-12-07 | 山西新华防化装备研究院有限公司 | Lightweight electromagnetic shielding tarpaulin and preparation method thereof |
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