CN108638619B - Impact-resistant electromagnetic shielding laminated board and preparation method and application thereof - Google Patents

Impact-resistant electromagnetic shielding laminated board and preparation method and application thereof Download PDF

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CN108638619B
CN108638619B CN201810207246.4A CN201810207246A CN108638619B CN 108638619 B CN108638619 B CN 108638619B CN 201810207246 A CN201810207246 A CN 201810207246A CN 108638619 B CN108638619 B CN 108638619B
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layer
impact
electromagnetic shielding
layers
shielding
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CN108638619A (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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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered 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
    • B32B5/02—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping 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
    • B29C70/34—Shaping 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered 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
    • B32B27/08—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered 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
    • B32B9/045—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/18—Aircraft

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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 an impact-resistant electromagnetic shielding laminated board and a preparation method and application thereof. The impact-resistant electromagnetic shielding laminated board comprises two insulating resin layers (1) at the outermost layer, n+1 carbon fiber felt shielding layers (2) and n aramid fiber cloth reinforcing layers (3) which are alternately stacked between the two insulating resin layers (1), and one insulating resin layer (1) is further arranged between the adjacent carbon fiber felt shielding layers (2) and the aramid fiber cloth reinforcing layers (3); the value range of n is 3-1. The product combines the advantages of the carbon fiber felt and the aramid fiber cloth, has excellent electromagnetic shielding performance, tensile performance and impact resistance, and is a thinner and corrosion-resistant novel light material.

Description

Impact-resistant electromagnetic shielding laminated board and preparation method and application thereof
Technical Field
The invention belongs to the field of electromagnetic shielding materials, and particularly relates to an impact-resistant electromagnetic shielding laminated board, and a preparation method and application thereof.
Background
With the advent of various electronic devices, electromagnetic radiation pollution became a new type of pollution. Electromagnetic radiation not only interferes with the proper operation of electronic equipment, but also can harm the health of the human body. In order to reduce the influence of electromagnetic radiation on human life, some electromagnetic shielding materials such as chopped carbon fiber mats are receiving a great deal of attention gradually, for example, chinese patent application CN201710028677 discloses a chopped carbon fiber electromagnetic shielding composite material and a preparation method thereof, and the structure comprises two insulating resin layers and one carbon fiber mat shielding layer, which are outer layers, and has good conductivity and electromagnetic shielding performance. However, in order to pursue excellent electromagnetic shielding performance, the prior art often neglects the mechanical performance of the electromagnetic shielding material, and the mechanical performance is the basic guarantee that the electromagnetic shielding material is applied to various fields. For housings of military aircraft and precision electronic equipment, good impact resistance is a necessary property in addition to excellent electromagnetic shielding properties. Since 1988, the number of deaths caused by birds striking aircraft has been hundreds. The impact resistance of chopped carbon fiber mats is poor due to the brittle nature of the carbon fibers, and practical applications thereof are severely limited.
The aramid fiber is a novel material with excellent corrosion resistance, high temperature resistance and mechanical properties, and is widely applied to the aspects of bulletproof armor, building reinforcement and the like. Because of its excellent properties, aramid fibers can be made into various ballistic garments, cut resistant gloves, flame resistant fabrics, and the like. However, the performance of the aramid fiber can be reduced after the aramid fiber is subjected to long-term visible light irradiation and absorbs water in a humid environment, and the non-conductive property of the aramid fiber prevents the aramid fiber from being applied to fields requiring electromagnetic shielding, such as stealth airplanes, precise electronic equipment shells and the like. Chinese patent application CN201210297876.8 discloses a mixed woven cloth of aramid fiber and carbon fiber, which solves the problem that carbon fiber is not impact-resistant. However, since the aramid fibers in the hybrid cloth do not have electromagnetic shielding capability, electromagnetic radiation can directly pass through the area occupied by the aramid fibers, so that the hybrid cloth cannot shield electromagnetic radiation. The hybrid cloth thus has only impact resistance and no electromagnetic shielding ability. In addition, light weight, corrosion resistance and weather resistance gradually become key technical problems to be solved in the aerospace field. Therefore, the prior art still lacks a material which has the advantages of impact resistance, excellent electromagnetic shielding performance, corrosion resistance and the like.
Disclosure of Invention
To solve the disadvantages and shortcomings of the prior art, a primary object of the present invention is to provide an impact-resistant electromagnetic shielding laminate, a method for preparing the same, and an application of the impact-resistant electromagnetic shielding laminate in the aerospace field.
The aim of the invention is achieved by the following technical scheme:
an impact-resistant electromagnetic shielding laminated board comprises two insulation resin layers 1 on the outermost layer, n+1 carbon fiber felt shielding layers 2 and n aramid fiber cloth reinforcing layers 3 which are alternately stacked between the two insulation resin layers 1, and one insulation resin layer 1 is also arranged between the adjacent carbon fiber felt shielding layers 2 and the adjacent aramid fiber cloth reinforcing layers 3; the value range of n is 3-1.
Preferably, the mass ratio of the single-layer carbon fiber felt shielding layer 2 to the single-layer aramid fiber cloth reinforcing layer 3 is 4:9-1:1.
Preferably, the insulating resin layer 1 is made of thermoplastic resin and has a thickness of 0.10 to 0.13mm.
Preferably, the carbon fiber felt shielding layer 2 is made of chopped carbon fibers with the length of 4-8 mm by wet papermaking, and has the surface density of 40-60 g/m 2 。
Preferably, the aramid fiber cloth reinforcing layer 3 is a plain cloth woven by aramid fiber tows.
The preparation method of the impact-resistant electromagnetic shielding laminated board comprises the following steps:
(1) Adding chopped carbon fibers into 0.6-1.4 wt% of carboxyethyl cellulose dispersion liquid according to the proportion of 0.09-0.12 g/L, stirring and dispersing uniformly, and then making into a carbon fiber felt shielding layer 2 by wet papermaking;
(2) Alternately stacking the carbon fiber felt shielding layers 2 and the n aramid fiber cloth reinforcing layers 3 obtained in the n+1 steps (1), placing an insulating resin layer 1 between the adjacent carbon fiber felt shielding layers 2 and the aramid fiber cloth reinforcing layers 3, and then respectively placing an insulating resin layer 1 on the upper surface and the lower surface of the obtained multilayer structure;
(3) Laminating the multi-layer material obtained in the step (2) at 180-200 ℃ and at 1-6 MPa.
Preferably, in the step (1), the chopped carbon fibers are firstly treated with acetone for 30-50 min, then treated with ultrasonic waves for 40-60 min, and then dried for 1-2 h at 30-50 ℃; the stirring speed is 600-700 rmp, and the stirring time is 4-6 min.
Preferably, the multi-layer material is extruded back and forth by a press roller before lamination in the step (3), and the interlayer gas is discharged.
In general, laminates often combine layers of materials by applying a layer of water-soluble adhesive or hot-melt adhesive to one side of each layer of material. However, the mechanical properties of the aramid fiber are affected after the aramid fiber absorbs water, so that the aramid fiber is not suitable for using a water-soluble adhesive. For hot melt adhesives, the hot melt temperature used in lamination is critical. The poor fluidity of the adhesive caused by insufficient temperature leads to poor combination between materials, layering defect occurs, and the mechanical property of the materials is affected; and the temperature is too high, the mobility of the adhesive is too strong and can drive the carbon fiber felt shielding layer to expand outwards, so that the conductive net shape of the carbon fiber felt is damaged, and the electromagnetic shielding performance can be attenuated. And in the temperature range defined by the invention, the obtained laminated board can have good electromagnetic shielding performance and mechanical performance at the same time.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the carbon fiber felt shielding layer and the aramid fiber cloth reinforcing layer are overlapped, so that the laminated board has the electromagnetic shielding property of the carbon fiber felt shielding layer and the impact resistance of the aramid fiber cloth reinforcing layer.
(2) The outermost layer of the laminated board is an insulating resin layer, which isolates the contact between the aramid fiber cloth reinforcing layer and the outside air, and overcomes the defect that the mechanical property of the aramid fiber is reduced after the water absorption. And the insulating resin layer of the outermost layer provides a good protection effect for the material.
(3) The carbon fiber felt shielding layer is arranged outside the aramid fiber cloth reinforcing layer to shield light, so that the problem of poor light resistance of the aramid fiber is solved.
(4) The carbon fiber and the aramid fiber adopted by the invention are light materials, which is beneficial to the development of the aerospace field.
Drawings
Fig. 1 is a schematic structural view of an impact-resistant electromagnetic shielding laminate obtained in example 1 of the present invention.
Fig. 2 is an SEM image of the carbon fiber felt shielding layer in example 1 of the present invention.
Fig. 3 is a schematic structural view of the aramid fabric reinforcing layer of the present invention.
Fig. 4 is a digital picture showing the disruption of the continuous conductive network of the laminate obtained in comparative example 3 of the present invention.
Fig. 5 is an SEM image showing delamination defects of the laminate obtained in comparative example 4 of the present invention.
Reference numerals
1 is an insulating resin layer; 2 is a carbon fiber felt shielding layer; 3 is an aramid fiber cloth reinforcing layer
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
An impact-resistant electromagnetic shielding laminated board comprises two insulation resin layers 1 on the outermost layer, three carbon fiber felt shielding layers 2 and two aramid fiber cloth reinforcing layers 3 which are alternately stacked between the two insulation resin layers 1, and one insulation resin layer 1 is also arranged between the adjacent carbon fiber felt shielding layers 2 and the adjacent aramid fiber cloth reinforcing layers 3;
the insulating resin layer 1 is made of a polycarbonate film, has the thickness of 0.1mm and has the advantages of corrosion resistance and weather resistance;
the carbon fiber felt shielding layer is made of chopped carbon fibers with the length of 6mm and the surface density of 50g/m 2 ；
The aramid fiber cloth reinforcing layer 3 is plain cloth woven by aramid fiber tows.
The mass ratio of the carbon fiber felt shielding layer to the aramid fiber cloth reinforcing layer is 5:7.
The preparation method of the impact-resistant electromagnetic shielding laminated board comprises the following steps:
(1) The carbon fiber tows in a continuous state were chopped into 6mm in length by a radial chopping technique, and then the chopped carbon fibers were soaked in an acetone solution for 30min and subjected to ultrasonic treatment for 40min to remove the slurry on the surfaces of the chopped carbon fibers. And (5) placing the treated chopped carbon fibers into a constant-temperature drying oven and drying at 40 ℃ for 1h.
(2) 1.57g of dried chopped carbon fibers were weighed and placed in 15L of a 1% strength dispersion of carboxyethyl cellulose, and the chopped carbon fibers were uniformly dispersed by mechanical stirring at 600rmp for 5 minutes. Then the carbon fiber felt shielding layer 2 is manufactured by wet papermaking technology, and the surface density of the carbon fiber felt shielding layer is 50g/m 2 。
(3) The plain weave cloth woven by the aramid fiber tows is used as the aramid fiber cloth reinforcing layer 3.
(4) And alternately stacking the three carbon fiber felt shielding layers 2 and the two aramid fiber cloth reinforcing layers 3, wherein the carbon fiber felt shielding layers 2 are arranged on the outermost surfaces. An insulating resin layer 1 is placed as an adhesive between the adjacent carbon fiber felt shielding layer 2 and the aramid fiber cloth reinforcing layer 3, and after the adhesion, insulating resin layers 1 made of polycarbonate films are placed as protective films on the upper and lower surfaces of the outermost layer of the laminated structure, thereby obtaining a multi-layer material.
(5) And extruding the multi-layer material back and forth by using a compression roller so as to discharge the interlayer gas. The multilayer material was then placed in a press to laminate at 180℃and a lamination pressure of 6MPa.
In this example, the impact resistant electromagnetic shielding laminate was subjected to thickness, density, electromagnetic shielding, stretching, and impact testing. The test result shows that the thickness of the laminated board is 1.02mm, and the density is 1.27g/cm 3 . The shielding effectiveness reaches 62dB in the frequency range of 30-1500MHz, and 99.9% of incident electromagnetic waves can be blocked. Tensile strength of 223MPa, impact peak force of 802.9N and impact damage area of 255mm 2 . Therefore, the laminated board prepared by the embodiment has excellent electromagnetic shielding performance, tensile performance and impact resistance, and is a thinner and corrosion-resistant light material.
Example 2
An impact-resistant electromagnetic shielding laminated board comprises two insulating resin layers 1 on the outermost layer, two carbon fiber felt shielding layers 2 and an aramid fiber cloth reinforcing layer 3 which are alternately stacked between the two insulating resin layers 1, and a layer of insulating resin layer 1 is also arranged between the adjacent carbon fiber felt shielding layers 2 and the aramid fiber cloth reinforcing layer 3;
the insulating resin layer 1 is made of a polycarbonate film, has the thickness of 0.12mm and has the advantages of corrosion resistance and weather resistance;
the carbon fiber felt shielding layer is made of chopped carbon fibers with the length of 8mm and the surface density of 60g/m 2 ；
The aramid fiber cloth reinforcing layer 3 is plain cloth woven by aramid fiber tows.
The mass ratio of the carbon fiber felt shielding layer to the aramid fiber cloth reinforcing layer is 2:3.
The preparation method of the impact-resistant electromagnetic shielding laminated board comprises the following steps:
(1) The carbon fiber tows in a continuous state were chopped into a length of 8mm by a radial chopping technique, and then the chopped carbon fibers were soaked in an acetone solution for 50min and subjected to ultrasonic treatment for 60min to remove the slurry on the surfaces of the chopped carbon fibers. And (5) placing the treated chopped carbon fibers into a constant-temperature drying oven to be dried for 2 hours at 30 ℃.
(2) 1.884g of chopped carbon fibers were weighed and placed in 16L of a 1.4% strength dispersion of carboxyethyl cellulose, and the chopped carbon fibers were uniformly dispersed by mechanical stirring at a stirring speed of 700rmp for 6 minutes. Then the carbon fiber felt shielding layer 2 is manufactured by wet papermaking technology, and the surface density of the carbon fiber felt shielding layer is 60g/m 2 。
(3) The plain weave cloth woven by the aramid fiber tows is used as the aramid fiber cloth reinforcing layer 3.
(4) And alternately stacking two carbon fiber felt shielding layers 2 and one aramid fiber cloth reinforcing layer 3, wherein the carbon fiber felt shielding layers 2 are arranged on the outermost surfaces. An insulating resin layer 1 is placed as an adhesive between the adjacent carbon fiber felt shielding layer 2 and the aramid fiber cloth reinforcing layer 3, and the insulating resin layer 1 is placed as a protective film on the upper and lower surfaces of the resulting multilayer structure, thereby obtaining a multilayer material.
(5) And extruding the multi-layer material back and forth by using a compression roller so as to discharge the interlayer gas. The multilayer material was then placed in a press to laminate at a temperature of 200℃and a lamination pressure of 3MPa.
In this example, the impact resistant electromagnetic shielding laminate was subjected to thickness, density, electromagnetic shielding, stretching, and impact testing. The test result showed that the laminate had a thickness of 0.652mm and a density of 1.32g/cm 3 . The shielding effectiveness reaches 53dB within the frequency range of 30-1500MHz, and 99.9% of incident electromagnetic waves can be blocked. Tensile strength of 178MPa, impact peak force of 545N and impact damage area of 230mm 2 . Therefore, the laminated board prepared by the embodiment has excellent electromagnetic shielding performance, tensile performance and impact resistance, and is a thinner and corrosion-resistant light material.
Example 3
An impact-resistant electromagnetic shielding laminated board comprises two insulating resin layers 1 on the outermost layer, two carbon fiber felt shielding layers 2 and an aramid fiber cloth reinforcing layer 3 which are alternately stacked between the two insulating resin layers 1, and a layer of insulating resin layer 1 is also arranged between the adjacent carbon fiber felt shielding layers 2 and the aramid fiber cloth reinforcing layer 3;
the insulating resin layer 1 is made of a polycarbonate film, has the thickness of 0.125mm and has the advantages of corrosion resistance and weather resistance;
the carbon fiber felt shielding layer is made of chopped carbon fibers with the length of 4mm and the surface density of 40g/m 2 ；
The aramid fiber cloth reinforcing layer 3 is plain cloth woven by aramid fiber tows.
The mass ratio of the carbon fiber felt shielding layer to the aramid fiber cloth reinforcing layer is 4:9.
A method of making the impact resistant electromagnetic shielding laminate of claim, comprising the steps of:
(1) The carbon fiber tows in a continuous state were chopped into 4mm in length by a radial chopping technique, and then the chopped carbon fibers were soaked in an acetone solution for 40min and subjected to ultrasonic treatment for 50min to remove the slurry on the surfaces of the chopped carbon fibers. And (5) placing the treated chopped carbon fibers into a constant-temperature drying oven and drying at 50 ℃ for 1h.
(2) 1.256g of chopped carbon fibers were weighed and placed in 14L of a 0.6% strength dispersion of carboxyethyl cellulose, and the chopped carbon fibers were uniformly dispersed by mechanical stirring at 650rmp for 4 minutes. Then the carbon fiber felt shielding layer 2 is manufactured by wet papermaking technology, and the surface density of the carbon fiber felt shielding layer is 40g/m 2 。
(3) The plain weave cloth woven by the aramid fiber tows is used as the aramid fiber cloth reinforcing layer 3.
(4) And alternately stacking two carbon fiber felt shielding layers 2 and one aramid fiber cloth reinforcing layer 3, wherein the carbon fiber felt shielding layers 2 are arranged on the outermost surfaces. An insulating resin layer 1 is placed as an adhesive between the adjacent carbon fiber felt shielding layer 2 and the aramid fiber cloth reinforcing layer 3, and the insulating resin layer 1 is placed as a protective film on the upper and lower surfaces of the resulting multilayer structure, thereby obtaining a multilayer material.
(5) And extruding the multi-layer material back and forth by using a compression roller so as to discharge the interlayer gas. The multilayer material was then placed in a press to laminate at 190℃under a lamination pressure of 1MPa.
In this example, the impact resistant electromagnetic shielding laminate was subjected to thickness, density, electromagnetic shielding, stretching, and impact testing. The test result shows that the thickness of the laminated board is 0.660mm, and the density is 1.21g/cm 3 . The shielding effectiveness reaches 49dB in the frequency range of 30-1500MHz, and 99.9% of incident electromagnetic waves can be blocked. The tensile strength is 172.2MPa, the impact peak force is 536.8N, and the impact damage area is 239mm 2 . Therefore, the laminated board prepared by the embodiment has excellent electromagnetic shielding performance, tensile performance and impact resistance, and is a thinner and corrosion-resistant light material.
Comparative example 1
An impact resistant laminate was prepared as described in example 2, except that the carbon fiber blanket barrier layer 2 was removed entirely.
In comparative example 1, the shielding effectiveness of the material is 0.24dB in the frequency range of 30-1500MHz, i.e. only 5.4% of the incident electromagnetic waves can be blocked, and thus the electromagnetic shielding performance of the laminate prepared in comparative example 1 is far worse than that of example 2, and the electromagnetic shielding performance of the laminate is greatly improved by the carbon fiber felt shielding layer 2 in the invention.
Comparative example 2
An impact resistant laminate was prepared as described in example 2, except that the aramid cloth reinforcement layer 3 was removed entirely.
In comparative example 2, the impact peak force obtained by the material test was only 213N, and the impact damage area was enlarged to 850mm 2 The impact property of the laminate prepared in comparative example 2 is far worse than that of example 2, and the aramid cloth reinforcing layer 3 greatly improves the mechanical property of the laminate.
Comparative example 3
An impact-resistant electromagnetic shielding laminated board comprises two insulating resin layers 1 on the outermost layer, two carbon fiber felt shielding layers 2 and an aramid fiber cloth reinforcing layer 3 which are alternately stacked between the two insulating resin layers 1, and a layer of insulating resin layer 1 is also arranged between the adjacent carbon fiber felt shielding layers 2 and the aramid fiber cloth reinforcing layer 3;
the lamination temperature was 230 ℃, the remaining conditions and preparation method are described in example 2.
In comparative example 3, as shown in fig. 4, the destruction of the conductive network of carbon fibers due to the excessively high lamination temperature was observed with naked eyes. Through electromagnetic shielding test, the shielding effectiveness of the material is 36dB in the frequency range of 30-1500 MHz. It can be seen that the electromagnetic shielding performance of the laminate prepared in comparative example 3 is far inferior to that of example 2, and the attenuation of the electromagnetic shielding performance of the laminate can be prevented in the lamination temperature range defined in the present invention.
Comparative example 4
An impact-resistant electromagnetic shielding laminated board comprises two insulating resin layers 1 on the outermost layer, two carbon fiber felt shielding layers 2 and an aramid fiber cloth reinforcing layer 3 which are alternately stacked between the two insulating resin layers 1, and a layer of insulating resin layer 1 is also arranged between the adjacent carbon fiber felt shielding layers 2 and the aramid fiber cloth reinforcing layer 3;
the lamination temperature was 160℃and the remaining conditions and preparation method were as described in example 2.
In comparative example 4, as shown in fig. 5, the laminate was observed to have delamination defects by a scanning electron microscope. Through mechanical property test, the tensile strength of the material is 121MPa, the impact peak force is 412N, and the impact damage area is enlarged to 407mm 2 . It can be seen that the mechanical properties of the laminate prepared in comparative example 4 are far inferior to those of example 2, and the deterioration of the mechanical properties of the laminate can be prevented in the lamination temperature range defined in the present invention.
The following table summarizes some of the important parameters and technical effects of examples 1-3 and comparative examples 1-4.
TABLE 1 important parameters and technical effects of examples 1 to 3 and comparative examples 1 to 4
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (8)

1. The impact-resistant electromagnetic shielding laminated board is characterized by comprising two insulating resin layers (1) on the outermost layer, n+1 carbon fiber felt shielding layers (2) and n aramid fiber cloth reinforcing layers (3) which are alternately stacked between the two insulating resin layers (1), and one insulating resin layer (1) is arranged between the adjacent carbon fiber felt shielding layers (2) and the aramid fiber cloth reinforcing layers (3); the value range of n is 3 to 1;
the preparation method of the impact-resistant electromagnetic shielding laminated board comprises the following steps:
(1) Adding chopped carbon fibers into 0.6-1.4 wt% of carboxyethyl cellulose dispersion liquid according to the proportion of 0.09-0.12 g/L, stirring and dispersing uniformly, and then making into a carbon fiber felt shielding layer (2) by wet papermaking;
(2) Alternately stacking n+1 carbon fiber felt shielding layers (2) and n aramid fiber cloth reinforcing layers (3), placing one insulating resin layer (1) between the adjacent carbon fiber felt shielding layers (2) and the aramid fiber cloth reinforcing layers (3) to obtain a multilayer structure, and respectively placing one insulating resin layer (1) on the upper surface and the lower surface of the multilayer structure to obtain a multilayer material;
(3) Laminating the multi-layer material at 180-200 deg.c and 1-6 MPa.
2. An impact resistant electromagnetic shielding laminate according to claim 1, characterized in that the mass ratio of the carbon fiber mat shielding layer (2) of a single layer to the aramid fiber cloth reinforcement layer (3) of a single layer is 4:9-1:1.
3. An impact-resistant electromagnetic shielding laminate according to claim 1, characterized in that the material of the insulating resin layer (1) is a thermoplastic resin, each layer having a thickness of 0.10-0.13 mm.
4. An impact-resistant electromagnetic shielding laminate according to claim 1, characterized in that the carbon fiber felt shielding layer (2) is made of chopped carbon fibers having a length of 4-8 mm by wet papermaking and has an areal density of 40-60 g/m 2 。
5. An impact resistant electromagnetic shielding laminate according to claim 1, characterised in that the aramid cloth reinforcement layer (3) is a plain cloth woven from aramid fiber tows.
6. The impact-resistant electromagnetic shielding laminate according to claim 1, wherein the chopped carbon fibers in the step (1) are firstly treated with acetone for 30 to 50min, then treated with ultrasonic waves for 40 to 60min, and then dried at 30 to 50 ℃ for 1 to 2h; the stirring speed is 600-700 rmp, and the stirring time is 4-6 min.
7. An impact resistant electromagnetic shielding laminate according to claim 1, wherein said lamination is carried out by pressing the multi-layered material back and forth with a press roll to remove interlayer gas.
8. Use of an impact resistant electromagnetic shielding laminate according to any one of claims 1-7 in the aerospace field.
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