CN108638619A - Impact-resistant electromagnetic shielding laminate of one kind and the preparation method and application thereof - Google Patents

Impact-resistant electromagnetic shielding laminate of one kind and the preparation method and application thereof Download PDF

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Publication number
CN108638619A
CN108638619A CN201810207246.4A CN201810207246A CN108638619A CN 108638619 A CN108638619 A CN 108638619A CN 201810207246 A CN201810207246 A CN 201810207246A CN 108638619 A CN108638619 A CN 108638619A
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layer
carbon fiber
impact
electromagnetic shielding
insulating resin
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CN108638619B (en
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陆龙生
汤伟津
邢迪
谢颖熙
汤勇
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/30Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/54Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/12Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/36Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/045Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02Synthetic macromolecular fibres
    • B32B2262/0261Polyamide fibres
    • B32B2262/0269Aromatic polyamide fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10Inorganic fibres
    • B32B2262/106Carbon fibres, e.g. graphite fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/20Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212Electromagnetic interference shielding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558Impact strength, toughness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00Vehicles
    • B32B2605/18Aircraft

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Nonwoven Fabrics (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention discloses a kind of impact-resistant electromagnetic shielding laminates and the preparation method and application thereof.The impact-resistant electromagnetic shielding laminate includes outermost two layers of insulating resin layer (1), and n+1 carbon fiber felt shielded layer (2) being stacked alternately between two layers of insulating resin layer (1) and n aramid fabric enhancement layer (3), one layer of insulating resin layer (1) is additionally provided between adjacent carbon fiber felt shielded layer (2) and aramid fabric enhancement layer (3);The value range of the n is 3 >=n >=1.The advantages of product of the present invention combines both carbon fiber felt and aramid fabric, has had both excellent capability of electromagnetic shielding, tensile property and impact resistance, has been a kind of relatively thin, corrosion resistant new lightweight material.

Description

Impact-resistant electromagnetic shielding laminate of one kind and the preparation method and application thereof
Technical field
The invention belongs to electromagnetic shielding material fields, and in particular to the impact-resistant electromagnetic shielding laminate of one kind and its preparation Method and application.
Background technology
With the appearance of various electronic equipments, electromagnetic radiation pollution becomes a kind of novel pollution.Electromagnetic radiation is not only The normal operation of electronic equipment, and the health of meeting harmful to human can be interfered.In order to reduce shadow of the electromagnetic radiation to human lives It rings, some electromagnetic shielding materials such as chopped carbon fiber felt gradually has received widespread attention, such as Chinese patent application CN201710028677 discloses a kind of chopped carbon fiber electromagnetic shielding composite material and preparation method thereof, and structure includes outer layer Two layers of insulating resin layer and one layer of carbon fiber felt shielded layer have good electric conductivity and capability of electromagnetic shielding.But in order to chase after Excellent capability of electromagnetic shielding is sought, the prior art often ignores the mechanical property of electromagnetic shielding material, and mechanical property is electricity Magnetic shielding material is applied to the basic guarantee of every field.For the shell of military aircraft, sophisticated electronics, in addition to excellent Electromagnetic wave shielding, good impact resistance are also the performance of indispensability.Since 1988, caused due to bird collisions aircraft dead The number died is hundreds of.Due to the brittleness of carbon fiber so that the impact resistance of chopped carbon fiber felt is very poor, in fact Border application receives serious limitation.
Aramid fiber is the new material of a kind of corrosion-resistant, high temperature resistant, excellent in mechanical performance, is widely used shellproof Armor, building reinforcing etc..Due to its excellent performance, aramid fiber can be made various antiballistic clothing, Anti-cut Gloves with And flame-retardant textile etc..But aramid fiber its performance meeting after absorbing water by long-term radiation of visible light and in wet condition Decline, and the nonconducting property of aramid fiber hinders it to need to be electromagnetically shielded in invisbile plane, sophisticated electronics shell etc. Field application.Chinese patent application CN201210297876.8 discloses a kind of aramid fiber and carbon fiber shuffling cloth, solution Determined carbon fiber not impact resistance the problem of.But since there is no the ability of electromagnetic shielding, electromagnetism for the aramid fiber in shuffling cloth Radiation can be directly by the region occupied by aramid fiber, and electromagnetic radiation cannot be shielded by resulting in shuffling cloth.Therefore shuffling Cloth only has impact resistance without the ability of electromagnetic shielding.In addition, light weight, corrosion-resistant, resistance to weather are increasingly becoming Aerospace field needs the key technical problem solved.Therefore, currently available technology also lacks one kind and having both impact resistance, electromagnetism The material for the advantages that shielding properties is excellent, corrosion-resistant.
Invention content
To solve the disadvantage that the prior art and shortcoming, the primary purpose of the present invention is that providing a kind of impact-resistant electricity Magnetic masking layer pressing plate and preparation method thereof and the impact-resistant application for being electromagnetically shielded laminate in aerospace field.
The purpose of the invention is achieved by the following technical solution:
A kind of impact-resistant electromagnetic shielding laminate, including outermost two layers of insulating resin layer 1, and insulate at two layers The n+1 carbon fiber felt shielded layer 2 and n aramid fabric enhancement layer 3 being stacked alternately between resin layer 1, adjacent carbon fiber felt screen It covers and is additionally provided with one layer of insulating resin layer 1 between layer 2 and aramid fabric enhancement layer 3;The value range of the n is 3 >=n >=1.
Preferably, the mass ratio of the aramid fabric enhancement layer 3 of the carbon fiber felt shielded layer 2 and single layer of single layer is 4: 9~1:1.
Preferably, the material of the insulating resin layer 1 is thermoplastic resin, and thickness is 0.10~0.13mm.
Preferably, the carbon fiber felt shielded layer 2 is made by the chopped carbon fiber that length is 4~8mm by wet papermaking, Its surface density is 40~60g/m2
Preferably, the aramid fabric enhancement layer 3 is plain made of being woven through aramid fiber tow.
The preparation method of the impact-resistant electromagnetic shielding laminate, includes the following steps:
(1) chopped carbon fiber is added to the carboxyethyl cellulose point of 0.6~1.4wt% in the ratio of 0.09~0.12g/L In dispersion liquid, it is dispersed with stirring uniformly, carbon fiber felt shielded layer 2 is then manufactured paper with pulp by wet papermaking;
(2) carbon fiber felt shielded layer 2 and n aramid fabric enhancement layer 3 obtained by n+1 step (1) are stacked alternately, it is adjacent One layer of insulating resin layer 1 is placed between carbon fiber felt shielded layer 2 and aramid fabric enhancement layer 3, then above and below the multilayered structure of gained One layer of insulating resin layer 1 is placed respectively in surface;
(3) multilayer material that step (2) obtains is laminated, the temperature of lamination is 180~200 DEG C, lamination pressure 1 ~6MPa.
Preferably, chopped carbon fiber described in step (1) first uses 30~50min of acetone treatment, then ultrasonication 40~ 60min, then dry 1~2h at 30~50 DEG C;The mixing speed is 600~700rmp, and mixing time is 4~6min.
Preferably, first multilayer material is squeezed back and forth with pressure roller before step (3) lamination, drains the gas of interlayer.
In general, laminate often applies last layer water solubility adhesive or hot melt viscose glue by the one side in every layer material Agent combines layers of material.However its mechanical property can be affected after being absorbed water due to aramid fiber, result in it and be not suitable for making With water-soluble adhesive.For hot melt adhesive, the hot melting temperature used in lamination is very crucial.Temperature deficiency can make Adhesive poor fluidity so that the combination between material is bad, lamination defect occurs, influences the mechanical performance of material;And temperature Excessively high, the mobility of adhesive is too strong to drive carbon fiber felt shielded layer to expand outward, so that the conductive mesh of carbon fiber felt Shape is destroyed, therefore capability of electromagnetic shielding can decay.And within the temperature range of the present invention limits, gained laminate can be same When have good capability of electromagnetic shielding and mechanical performance.
Compared with prior art, the present invention has the advantages that:
(1) present invention is by being superimposed carbon fiber felt shielded layer and aramid fabric enhancement layer so that laminate has been provided simultaneously with carbon The impact resistance of the electromagnetic wave shielding and aramid fabric enhancement layer of fibrofelt shielded layer.
(2) outermost layer of laminate is insulating resin layer, has completely cut off contact of the aramid fabric enhancement layer with outside air, has overcome The shortcomings that mechanical property can decline after aramid fiber water suction.And outermost insulating resin layer provides well for material Protective effect.
(3) there is carbon fiber felt shielded layer to shut out the light outside aramid fabric enhancement layer, it is poor to solve aramid fiber light resistance The problem of.
(4) carbon fiber, the aramid fiber that the present invention uses are light material, are conducive to the development of field of aerospace.
Description of the drawings
Fig. 1 is the structural schematic diagram of the impact-resistant electromagnetic shielding laminate of 1 gained of the embodiment of the present invention.
Fig. 2 is the SEM figures of the carbon fiber felt shielded layer in the embodiment of the present invention 1.
Fig. 3 is the structural schematic diagram of aramid fabric enhancement layer of the present invention.
Fig. 4 is the digital pictures for showing 3 gained laminate continuous conduction network of comparative example of the present invention and being destroyed.
Fig. 5 is the SEM figures for showing 4 gained laminate lamination defect of comparative example of the present invention.
Reference numeral
1 is insulating resin layer;2 be carbon fiber felt shielded layer;3 be aramid fabric enhancement layer
Specific implementation mode
With reference to embodiment, the present invention is described in further detail, and embodiments of the present invention are not limited thereto.
Embodiment 1
A kind of impact-resistant electromagnetic shielding laminate, including outermost two layers of insulating resin layer 1, and insulate at two layers The three carbon fiber felt shielded layers 2 and two aramid fabric enhancement layers 3 being stacked alternately between resin layer 1, adjacent carbon fiber felt screen It covers and is additionally provided with one layer of insulating resin layer 1 between layer 2 and aramid fabric enhancement layer 3;
The material of the insulating resin layer 1 is polycarbonate film, and thickness 0.1mm is excellent with corrosion-resistant, resistance to weather Point;
The carbon fiber felt shielded layer is made by the chopped carbon fiber that length is 6mm, surface density 50g/m2
The aramid fabric enhancement layer 3 is plain made of being woven through aramid fiber tow.
The mass ratio of the carbon fiber felt shielded layer and aramid fabric enhancement layer is 5:7.
The preparation method of the impact-resistant electromagnetic shielding laminate, includes the following steps:
(1) it is 6mm the carbon fibre tow of continuous state to be chopped as length by radial chopped technology, then uses acetone molten Liquid impregnates chopped carbon fiber 30min, and carries out ultrasonication 40min to remove the slurry on chopped carbon fiber surface.It will processing Chopped carbon fiber afterwards is placed into 40 DEG C of dry 1h in thermostatic drying chamber.
(2) the chopped carbon fiber 1.57g after drying is weighed, the carboxyethyl cellulose point of 15L a concentration of 1% is placed into Using churned mechanically mode that chopped carbon fiber is evenly dispersed in dispersion liquid, mixing speed 600rmp, mixing time is 5min.Then carbon fiber felt shielded layer 2 is manufactured paper with pulp by wet papermaking technology, the surface density of carbon fiber felt shielded layer is 50g/ m2
(3) plain is as aramid fabric enhancement layer 3 made of being woven through aramid fiber tow.
(4) three carbon fiber felt shielded layers 2 and two aramid fabric enhancement layers 3 are stacked alternately, outermost is carbon Fibrofelt shielded layer 2.An insulating resin layer 1 is placed between adjacent carbon fiber felt shielded layer 2 and aramid fabric enhancement layer 3 As adhesive, the insulation that material is polycarbonate film is placed in the outermost upper and lower surface of its stepped construction after bonding Resin layer 1 is used as protective film, to obtain multilayer material.
(5) multilayer material is squeezed back and forth with pressure roller, to drain the gas of interlayer.Then multilayer material is put It sets in vulcanizing press and is laminated, the temperature of lamination is 180 DEG C, lamination pressure 6MPa.
In this embodiment, to impact-resistant electromagnetic shielding laminate carried out thickness, density, electromagnetic shielding, stretching with And shock-testing.Test result is that the thickness of laminate is 1.02mm, density 1.27g/cm3.It is 30-1500MHz in frequency In the range of its shield effectiveness reach 62dB, can stop 99.9% incident electromagnetic wave.Tensile strength is 223MPa, impacts peak It is worth power 802.9N, impact failure area is 255mm2.Therefore laminate manufactured in the present embodiment has excellent electromagnetic wave shielding Energy, tensile property and impact resistance, are a kind of relatively thin, corrosion resistant light materials.
Embodiment 2
A kind of impact-resistant electromagnetic shielding laminate, including outermost two layers of insulating resin layer 1, and insulate at two layers The two carbon fiber felt shielded layers 2 and an aramid fabric enhancement layer 3 being stacked alternately between resin layer 1, adjacent carbon fiber felt screen It covers and is additionally provided with one layer of insulating resin layer 1 between layer 2 and aramid fabric enhancement layer 3;
The material of the insulating resin layer 1 is polycarbonate film, and thickness 0.12mm has corrosion-resistant, resistance to weather Advantage;
The carbon fiber felt shielded layer is made by the chopped carbon fiber that length is 8mm, surface density 60g/m2
The aramid fabric enhancement layer 3 is plain made of being woven through aramid fiber tow.
The mass ratio of the carbon fiber felt shielded layer and aramid fabric enhancement layer is 2:3.
The preparation method of the impact-resistant electromagnetic shielding laminate, includes the following steps:
(1) it is 8mm the carbon fibre tow of continuous state to be chopped as length by radial chopped technology, then uses acetone molten Liquid impregnates chopped carbon fiber 50min, and carries out ultrasonication 60min to remove the slurry on chopped carbon fiber surface.It will processing Chopped carbon fiber afterwards is placed into 30 DEG C of dry 2h in thermostatic drying chamber.
(2) chopped carbon fiber for weighing 1.884g is placed into the carboxyethyl cellulose dispersion liquid of 16L a concentration of 1.4%, It is using churned mechanically mode that chopped carbon fiber is evenly dispersed, mixing speed 700rmp, mixing time 6min.Then lead to It crosses wet method paper technology and manufactures paper with pulp into carbon fiber felt shielded layer 2, the surface density of carbon fiber felt shielded layer is 60g/m2
(3) plain is as aramid fabric enhancement layer 3 made of being woven through aramid fiber tow.
(4) two carbon fiber felt shielded layers 2 and an aramid fabric enhancement layer 3 are stacked alternately, outermost is equal For carbon fiber felt shielded layer 2.An insulation tree is placed between adjacent carbon fiber felt shielded layer 2 and aramid fabric enhancement layer 3 Lipid layer 1 is used as adhesive, and placing insulating resin layer 1 in the multilayered structure upper and lower surface of gained is used as protective film, more to obtain Layer material.
(5) multilayer material is squeezed back and forth with pressure roller, to drain the gas of interlayer.Then multilayer material is put It sets in vulcanizing press and is laminated, the temperature of lamination is 200 DEG C, lamination pressure 3MPa.
In this embodiment, to impact-resistant electromagnetic shielding laminate carried out thickness, density, electromagnetic shielding, stretching with And shock-testing.Test result is that the thickness of laminate is 0.652mm, density 1.32g/cm3.It is 30-1500MHz in frequency In the range of its shield effectiveness reach 53dB, can stop 99.9% incident electromagnetic wave.Tensile strength is 178MPa, impacts peak Value power is 545N, impact damage area 230mm2.Therefore laminate manufactured in the present embodiment have excellent capability of electromagnetic shielding, Tensile property and impact resistance are a kind of relatively thin, corrosion resistant light materials.
Embodiment 3
A kind of impact-resistant electromagnetic shielding laminate, including outermost two layers of insulating resin layer 1, and insulate at two layers The two carbon fiber felt shielded layers 2 and an aramid fabric enhancement layer 3 being stacked alternately between resin layer 1, adjacent carbon fiber felt screen It covers and is additionally provided with one layer of insulating resin layer 1 between layer 2 and aramid fabric enhancement layer 3;
The material of the insulating resin layer 1 is polycarbonate film, and thickness 0.125mm has corrosion-resistant, resistance to weather Advantage;
The carbon fiber felt shielded layer is made by the chopped carbon fiber that length is 4mm, surface density 40g/m2
The aramid fabric enhancement layer 3 is plain made of being woven through aramid fiber tow.
The mass ratio of the carbon fiber felt shielded layer and aramid fabric enhancement layer is 4:9.
A kind of preparation method of such as described impact-resistant electromagnetic shielding laminate, includes the following steps:
(1) it is 4mm the carbon fibre tow of continuous state to be chopped as length by radial chopped technology, then uses acetone molten Liquid impregnates chopped carbon fiber 40min, and carries out ultrasonication 50min to remove the slurry on chopped carbon fiber surface.It will processing Chopped carbon fiber afterwards is placed into 50 DEG C of dry 1h in thermostatic drying chamber.
(2) chopped carbon fiber for weighing 1.256g is placed into the carboxyethyl cellulose dispersion liquid of 14L a concentration of 0.6%, It is using churned mechanically mode that chopped carbon fiber is evenly dispersed, mixing speed 650rmp, mixing time 4min.Then lead to It crosses wet method paper technology and manufactures paper with pulp into carbon fiber felt shielded layer 2, the surface density of carbon fiber felt shielded layer is 40g/m2
(3) plain is as aramid fabric enhancement layer 3 made of being woven through aramid fiber tow.
(4) two carbon fiber felt shielded layers 2 and an aramid fabric enhancement layer 3 are stacked alternately, outermost is equal For carbon fiber felt shielded layer 2.An insulation tree is placed between adjacent carbon fiber felt shielded layer 2 and aramid fabric enhancement layer 3 Lipid layer 1 is used as adhesive, and placing insulating resin layer 1 in the multilayered structure upper and lower surface of gained is used as protective film, more to obtain Layer material.
(5) multilayer material is squeezed back and forth with pressure roller, to drain the gas of interlayer.Then multilayer material is put It sets in vulcanizing press and is laminated, the temperature of lamination is 190 DEG C, lamination pressure 1MPa.
In this embodiment, to impact-resistant electromagnetic shielding laminate carried out thickness, density, electromagnetic shielding, stretching with And shock-testing.Test result is that the thickness of laminate is 0.660mm, density 1.21g/cm3.It is 30-1500MHz in frequency In the range of its shield effectiveness reach 49dB, can stop 99.9% incident electromagnetic wave.Tensile strength is 172.2MPa, impact Peak force is 536.8N, impact damage area 239mm2.Therefore laminate manufactured in the present embodiment has excellent electromagnetic shielding Performance, tensile property and impact resistance are a kind of relatively thin, corrosion resistant light materials.
Comparative example 1
A kind of impact-resistant laminate, in addition to carbon fiber felt shielded layer 2 is all removed, remaining condition and preparation method ginseng See embodiment 2.
In comparative example 1, material its shield effectiveness in the range of frequency is 30-1500MHz is 0.24dB, that is, is only capable of hindering The incident electromagnetic wave of gear 5.4%, it is seen that the capability of electromagnetic shielding of laminate prepared by comparative example 1 is much worse than embodiment 2, the present invention Middle carbon fiber felt shielded layer 2 makes laminate capability of electromagnetic shielding obtain great promotion.
Comparative example 2
A kind of impact-resistant laminate, in addition to aramid fabric enhancement layer 3 is all removed, remaining condition and preparation method referring to Embodiment 2.
In comparative example 2, the impact peak value power that testing of materials obtains is only 213N, and impact damage area is expanded as 850mm2, it is seen that the impact property of laminate prepared by comparative example 2 is much worse than embodiment 2, and aramid fabric enhancement layer 3 makes in the present invention Laminate mechanical property has obtained great promotion.
Comparative example 3
A kind of impact-resistant electromagnetic shielding laminate, including outermost two layers of insulating resin layer 1, and insulate at two layers The two carbon fiber felt shielded layers 2 and an aramid fabric enhancement layer 3 being stacked alternately between resin layer 1, adjacent carbon fiber felt screen It covers and is additionally provided with one layer of insulating resin layer 1 between layer 2 and aramid fabric enhancement layer 3;
The temperature of lamination is 230 DEG C, remaining condition and preparation method are referring to embodiment 2.
In comparative example 3, as shown in figure 4, naked eyes are it is observed that the electric conduction of carbon fiber generated since laminating temperature is excessively high The destruction of network.It is tested by electromagnetic shielding, material its shield effectiveness in the range of frequency is 30-1500MHz is 36dB.It can See comparative example 3 prepare laminate capability of electromagnetic shielding much worse than embodiment 2, the laminating temperature range defined by the present invention The interior decaying that can prevent laminate capability of electromagnetic shielding.
Comparative example 4
A kind of impact-resistant electromagnetic shielding laminate, including outermost two layers of insulating resin layer 1, and insulate at two layers The two carbon fiber felt shielded layers 2 and an aramid fabric enhancement layer 3 being stacked alternately between resin layer 1, adjacent carbon fiber felt screen It covers and is additionally provided with one layer of insulating resin layer 1 between layer 2 and aramid fabric enhancement layer 3;
The temperature of lamination is 160 DEG C, remaining condition and preparation method are referring to embodiment 2.
In comparative example 4, as shown in figure 5, being observed that layering occurs in laminate by scanning electron microscope Defect.By Mechanics Performance Testing, the tensile strength of material is 121MPa, and impact peak value power is 412N, and impact damage area expands 407mm is arrived greatly2.The mechanical property of laminate prepared by visual contrast example 4 is much worse than embodiment 2, the layer defined by the present invention The decaying of laminate mechanical property can be prevented in pressure temperature range.
Following table summarizes some important parameters and technique effect of Examples 1 to 3 and comparative example 1~4.
The important parameter and technique effect of 1 Examples 1 to 3 of table and comparative example 1~4
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications, Equivalent substitute mode is should be, is included within the scope of the present invention.

Claims (9)

1. a kind of impact-resistant electromagnetic shielding laminate, which is characterized in that including outermost two layers of insulating resin layer (1), with And n+1 carbon fiber felt shielded layer (2) being stacked alternately between two layers of insulating resin layer (1) and n aramid fabric enhancement layer (3), one layer of insulating resin layer (1) is additionally provided between adjacent carbon fiber felt shielded layer (2) and aramid fabric enhancement layer (3);Institute The value range for stating n is 3 >=n >=1.
2. a kind of impact-resistant electromagnetic shielding laminate according to claim 1, which is characterized in that the carbon fiber of single layer The mass ratio for tieing up felt shielded layer (2) and the aramid fabric enhancement layer (3) of single layer is 4:9~1:1.
3. a kind of impact-resistant electromagnetic shielding laminate according to claim 1, which is characterized in that the insulating resin layer (1) material is thermoplastic resin, is 0.10~0.13mm per layer thickness.
4. a kind of impact-resistant electromagnetic shielding laminate according to claim 1, which is characterized in that the carbon fiber felt screen It covers layer (2) to be made by wet papermaking by the chopped carbon fiber that length is 4~8mm, surface density is 40~60g/m2
5. a kind of impact-resistant electromagnetic shielding laminate according to claim 1, which is characterized in that the aramid fabric enhancing Layer (3) is plain made of being woven through aramid fiber tow.
6. a kind of preparation method of impact-resistant electromagnetic shielding laminate, which is characterized in that include the following steps:
(1) chopped carbon fiber is added to the carboxyethyl cellulose dispersion liquid of 0.6~1.4wt% in the ratio of 0.09~0.12g/L In, it is dispersed with stirring uniformly, carbon fiber felt shielded layer (2) is then manufactured paper with pulp by wet papermaking;
(2) the n+1 carbon fiber felt shielded layers (2) and n aramid fabric enhancement layer (3) are stacked alternately, adjacent carbon fiber One layer of insulating resin layer (1) is placed between felt shielded layer (2) and aramid fabric enhancement layer (3) and obtains multilayered structure, in the multilayer Structure upper and lower surface places one layer of insulating resin layer (1) and obtains multilayer material respectively;
(3) multilayer material is laminated, the temperature of lamination is 180~200 DEG C, and lamination pressure is 1~6MPa.
7. a kind of preparation method of impact-resistant electromagnetic shielding laminate according to claim 6, which is characterized in that step (1) chopped carbon fiber described in first uses 30~50min of acetone treatment, then 40~60min of ultrasonication, then at 30~50 DEG C Dry 1~2h;The mixing speed is 600~700rmp, and mixing time is 4~6min.
8. a kind of preparation method of impact-resistant electromagnetic shielding laminate according to claim 6, which is characterized in that carry out First multilayer material is squeezed back and forth with pressure roller before the lamination, drains the gas of interlayer.
9. a kind of impact-resistant electromagnetic shielding laminate of Claims 1 to 5 any one of them is in the application of aerospace field.
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