KR20180053084A - Electromagnetic wave shield material lamination structure and manufacturing method of the same - Google Patents

Abstract

Introduced is an electromagnetic wave shielding material lamination structure including: a first reinforcing layer made of composite materials including a first reinforcing fiber with a continuous fiber form and a first resin impregnating the first reinforcing fiber; a shielding layer which is laminated along the upper side of the first reinforcing layer to be integrated with the first reinforcing layer and includes a second resin to form a matrix, a second reinforcing fiber with a long fiber or short fiber form dispersed in the second reins and a metal filler; and a second reinforcing layer which is laminated along the upper side of the shielding layer to be integrated with the shieling layer and made of composite materials including a third reinforcing fiber with a continuous fiber form and a third resin impregnating the third reinforcing fiber. Accordingly, the present invention can improve a mechanical property and shielding performance.

Description

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic wave shielding material laminated structure and a method for manufacturing the same, and more particularly to an electromagnetic wave shielding material lamination structure,

The present invention relates to an electromagnetic wave shielding material laminated structure having improved mechanical properties and improved shielding performance.

Recently, electromagnetic wave generation is increasing due to the rapid development and mass supply of computers, electronic products, communication devices, etc., and various problems such as the occurrence of noise phenomenon between electronic products due to the rapid increase of noise due to electromagnetic waves in various frequency ranges have.

Particularly, since electronic devices are applied to various safety devices and convenience devices for the safety of drivers and pedestrians in a vehicle, consumers' interest in the functions is maximized. Therefore, in order to reduce the power consumption and high integration , High reliability in various aspects such as suppression of electromagnetic interference between electronic parts due to multifunctionalization, electromagnetic wave shielding, immunity and the like are required.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

Japanese Patent Application Laid-Open No. 10-2015-0111469

An object of the present invention is to provide an electromagnetic shielding material laminated structure having improved mechanical properties and improved shielding performance.

According to an aspect of the present invention, there is provided an electromagnetic wave shielding material laminate structure, comprising: a first reinforcing layer made of a composite material including a first reinforcing fiber in the form of a continuous fiber and a first resin for impregnating the first reinforcing fiber; A second resin laminated along the top surface of said first toughening layer and integrally bonded with said first toughening layer and forming a matrix, a second reinforcement in the form of a long fiber or a short fiber dispersed in said second resin, A shielding layer comprising a fiber and a metal filler; And a second reinforcing layer made of a composite material including a third resin that is laminated along the upper surface of the shield layer and integrally bonded with the shield layer and impregnated with the third reinforcing fiber in a continuous fiber form, Layer.

The shielding layer may further include carbon black.

The shielding layer may include 25 to 45 parts by weight of the second reinforcing fiber, 5 to 15 parts by weight of the metal filler and 1 to 10 parts by weight of the carbon black with respect to 100 parts by weight of the second resin.

The metal filler may be composed of one or more metals selected from the group consisting of nickel (Ni), zinc (Zn), magnesium (Mg), silver (Ag), and copper (Cu) and may have an average particle size of 200 to 1000 nm.

The second reinforcing fiber is made of carbon fiber, and the second reinforcing fiber and the metal filler are connected to form a network with each other in the second resin so that the shielding layer can have conductivity.

Wherein the first reinforcing fiber and the third reinforcing fiber are made of carbon fiber and the first resin and the third resin are made of a thermoplastic resin, And a plurality of reinforcing layers impregnated in the thermoplastic resin may be repeatedly laminated to form a multilayer structure.

Wherein the reinforcing layer abutting the lower surface of the shield layer comprises a first mixed layer in which the second reinforcing fibers and the metal filler are positioned between the carbon fibers and the reinforcing layer abutting the upper surface of the shielding layer comprises carbon And the second reinforcing fiber and the metal filler may be positioned between the fibers to form a second mixed layer.

Wherein the carbon fiber is connected to the second reinforcing fiber and the metal filler and the carbon fiber is connected to the first reinforcing fiber and the metal filler, The shielding layer and the second reinforcing layer may have conductivity.

A pair of reinforcing layers located on the central layer in each of the first reinforcing layer and the second reinforcing layer may be in contact with each other to form a reference pair having the same arrangement direction.

The reinforcing layers stacked up and down with respect to the reference pair have the same arrangement direction, and a plurality of pairs of reinforcing layers, which form a pair and are based on the reference pair, can be repeatedly stacked.

Wherein the first reinforcing layer and the second reinforcing layer each comprise the reference pair and three pairs of reinforcing layers, and the arrangement direction of the first pair, which is vertically connected to the reference pair among the three pairs of reinforcing layers, Wherein a direction of arrangement of the second pair vertically connected to the first pair is 45 degrees with respect to an arrangement direction of the first pair and a direction of arrangement of the third pair vertically connected to the second pair is perpendicular to the arrangement direction of the reference pair, May be perpendicular to the arrangement direction of the second pair.

A method for manufacturing an electromagnetic shielding material laminated structure according to the present invention is a method for manufacturing a laminated structure of an electromagnetic shielding material, which comprises a first reinforcement layer made of a composite material including first reinforcing fibers in the form of continuous fibers and a first resin for impregnating the first reinforcing fibers, A first lamination step of laminating a shielding layer comprising a second reinforcing fiber, a metal filler and a second resin; And a second lamination step of laminating a second reinforcing layer made of a composite material including a third reinforcing fiber in the form of a continuous fiber on the upper surface of the shielding layer and a third resin for impregnating the third reinforcing fiber.

And a pressing step of disposing a laminate composed of the first reinforcing layer, the shielding layer and the second reinforcing layer on the mold after the second lamination step and applying a predetermined pressure to compress the laminate, The dB deviation of any two points on the laminate can be formed within 10 dB.

According to the electromagnetic wave shielding material lamination structure of the present invention as described above, the upper and lower surfaces of the shielding layer having a shielding function can be stacked as a reinforcing layer, thereby improving the mechanical properties.

Further, it is possible to expect the effect that the deviation of the shielding performance by each part is reduced by manufacturing by compression molding.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a laminated structure of an electromagnetic wave shielding material according to an embodiment of the present invention. FIG.
FIG. 2 illustrates a first enhancement layer, a second enhancement layer, and a shield layer comprising a plurality of enhancement layers in accordance with an embodiment of the present invention. FIG.
3 illustrates a first mixed layer and a second mixed layer and a shield layer according to an embodiment of the present invention.
FIG. 4 illustrates a first enhancement layer and a second enhancement layer comprising a reference pair and three pairs of enhancement layers in accordance with an embodiment of the present invention. FIG.
5 illustrates specimens of a specimen and a comparative specimen according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1, the electromagnetic shielding material laminated structure according to the present invention includes a first reinforcing layer 100 made of a composite material including a first reinforcing fiber in the form of a continuous fiber and a first resin for impregnating the first reinforcing fiber; A second resin laminated along the upper surface of the first reinforcing layer 100 and integrally bonded with the first reinforcing layer 100 to form a matrix, A shielding layer 200 comprising a second reinforcing fiber in the form of fibers and a metal filler; And a third resin that is laminated along the upper surface of the shielding layer (200) and integrally joined together with the shielding layer (200), the third reinforcing fiber in the continuous fiber form, and the third resin to impregnate the third reinforcing fiber And a second reinforcing layer 300 made of a material.

The first reinforcing layer 100 is made of a first resin that impregnates the first reinforcing fiber and the first reinforcing fiber in the form of a sheet in the form of a continuous fiber. The first reinforcing fiber may be composed of one or more kinds of fibers selected from carbon fiber, glass fiber, aramid fiber, and natural fiber. However, the present invention is not limited thereto.

The first reinforcing fibers may be in the form of a continuous fiber, such as UD (Uni Direction) in which the continuous fibers are arranged side by side, or may be in the form of a woven fabric woven to be crossed.

The first resin for impregnating the first reinforcing fiber may be made of a thermoplastic resin such as polyamide (PA), polypropylene (PP), polyethylene (PE) or the like. However, the present invention is not limited thereto.

The shielding layer 200 is laminated on the upper surface of the first reinforcing layer 100 and connected to the first reinforcing layer 100 in an integrated manner. Preferably, the shielding layer 200 is a state in which the second resin forming the matrix is cured with the sheet form, and the second reinforcing fibers, the metal filler, etc. in the form of long fibers or short fibers are mixed and dispersed in the second resin Can exist.

In the case of the second resin, it may be made of a thermoplastic resin such as polyamide (PA), polypropylene (PP), polyethylene (PE) or the like in the same manner as the first resin. However, the present invention is not limited thereto.

In the case of the second reinforcing fiber mixed with the second resin, it may exist in the form of a long fiber or a short fiber as a structure for reinforcing the second resin constituting the base. Herein, the long fiber or the short fiber is a chopped strand, which may mean a fiber having a length of 10 to 100 mm in the case of a long fiber, and a fiber having a length of 0.1 to 10 mm in the case of a short fiber.

Like the first reinforcing fiber, the second reinforcing fiber may be made of one or more kinds of fibers selected from carbon fiber, glass fiber, aramid fiber, and natural fiber. However, the present invention is not limited thereto.

On the other hand, the metal filler is present in a form mixed with the second resin constituting the base and dispersed in the second resin together with the second reinforcing fiber. The metal filler scatters electromagnetic waves in the shielding layer 200, thereby shielding electromagnetic waves.

The second reinforcing layer 300 is laminated on the upper surface of the shielding layer 200 and connected to the shielding layer 200 in an integrated manner. The second reinforcing layer 300 is made of a third resin that impregnates the third reinforcing fiber and the third reinforcing fiber in the form of a continuous fiber in sheet form. The third reinforcing fiber may be composed of one or more kinds of fibers selected from carbon fiber, glass fiber, aramid fiber and natural fiber. However, the present invention is not limited thereto.

The third reinforcing fibers may be in the form of a continuous fiber, such as UD (Uni Direction) in which the continuous fibers are arranged side by side, or may be in the form of a woven fabric woven to be crossed.

The third resin for impregnating the third reinforcing fiber may be made of a thermoplastic resin such as polyamide (PA), polypropylene (PP), polyethylene (PE) or the like. However, the present invention is not limited thereto.

The first reinforcing layer 100 and the second reinforcing layer 300 made of a composite material reinforced in the form of a continuous fiber are laminated on the upper and lower surfaces of the shielding layer 200 having an electromagnetic wave shielding function to form an integral body with the shielding layer 200 Mechanical strength such as strength and rigidity can be reinforced.

According to such mechanical properties, it can be applied to automobiles. In particular, it can be applied to a battery case of a vehicle which requires both mechanical properties and electromagnetic shielding performance. The thickness ratio of the first reinforcing layer 100 and the second reinforcing layer 300 to the shielding layer 200 may be 1: 0.5 to 2. By adjusting the thickness of each layer, the thickness ratio can be changed depending on the application.

Preferably, the shielding layer 200 may further include carbon black.

Carbon black is composed of carbon (C) particles and may exist in powder form. The average particle size of the particles may be between 1 and 500 nm. The carbon black is dispersed in the shielding layer 200 together with the second reinforcing fiber and the metal filler so that the shielding layer 200 can have conductivity.

Preferably, the shielding layer 200 comprises 25 to 45 parts by weight of the second reinforcing fiber, 5 to 15 parts by weight of the metal filler and 1 to 10 parts by weight of the carbon black with respect to 100 parts by weight of the second resin .

When the second reinforcing fiber is contained in an amount of less than 25 parts by weight based on 100 parts by weight of the second resin, the reinforcing effect of the shielding layer 200 by the second reinforcing fiber may not be large. When the second reinforcing fiber is contained in an amount exceeding 45 parts by weight, The amount of the second reinforcing fibers is larger than that of the resin, so that the mechanical properties of the shielding layer 200 itself may be deteriorated. Therefore, it is proper to control the second reinforcing fiber to 25 to 45 parts by weight with respect to 100 parts by weight of the second resin.

When the metal filler is contained in an amount of less than 5 parts by weight based on 100 parts by weight of the second resin, electromagnetic shielding performance may be deteriorated. If the metal filler is contained in an amount exceeding 15 parts by weight, the mechanical properties of the shielding layer 200 itself may be deteriorated. Therefore, it is proper to control the metal filler to 5 to 15 parts by weight based on 100 parts by weight of the second resin.

If the carbon black is contained in an amount of less than 1 part by weight based on 100 parts by weight of the second resin, electromagnetic shielding performance may be deteriorated. If the carbon black is included in an amount exceeding 10 parts by weight, the mechanical properties of the shielding layer 200 itself may deteriorate. Therefore, it is proper to control the carbon black to 1 to 10 parts by weight based on 100 parts by weight of the second resin.

In the case of the first reinforcing layer 100, 50 to 70 parts by weight of the first reinforcing fiber may be included in 100 parts by weight of the first resin. If the amount is less than 50 parts by weight, the synergistic effect of mechanical properties may not be significant. If the amount exceeds 70 parts by weight, the first reinforcing fiber may not be sufficiently impregnated in the first resin.

In the case of the second reinforcing layer 300, 50 to 70 parts by weight of the third reinforcing fiber may be added to 100 parts by weight of the third resin. If the amount is less than 50 parts by weight, the synergistic effect of mechanical properties may not be significant. If the amount exceeds 70 parts by weight, the third reinforcing fiber may not be sufficiently impregnated with the third resin.

The first reinforcing layer 100 and the second reinforcing layer 300 may further include a processing stabilizer, a heat stabilizer, and the like.

Preferably, the metal filler is made of at least one metal selected from the group consisting of nickel (Ni), zinc (Zn), magnesium (Mg), silver (Ag) and copper (Cu) .

In the case of the metal filler, the electromagnetic wave is dispersed in the shielding layer 200 to scatter the electromagnetic wave, thereby shielding the electromagnetic wave. And may be made of a metal having high conductivity. Specifically, it may be made of one or more kinds of metals selected from nickel (Ni), zinc (Zn), magnesium (Mg), silver (Ag), and copper (Cu)

On the other hand, when the average particle size of the metal filler is less than 200 nm, cost reduction becomes difficult and productivity may be reduced. If it exceeds 1000 nm, the conductivity increasing effect may be lowered. Accordingly, it is proper to control the average particle size of the metal filler to the range of 200 to 1000 nm.

Preferably, the second reinforcing fiber is made of carbon fiber, and the second reinforcing fiber and the metal filler are connected to form a network with each other in the second resin so that the shielding layer 200 is conductive Lt; / RTI >

The second reinforcing fiber in the form of a long fiber or a short fiber mixed with the second resin constituting the matrix is composed of carbon fibers having conductivity and dispersed with a random directionality. The metal filler dispersed in the second resin is connected to form a network with the second reinforcing fibers in the second resin, so that the shielding layer 200 becomes conductive.

When the carbon black is mixed with the second resin, it can likewise be connected to form a network together with the second reinforcing fiber and the metal filler.

2, the first reinforcing fiber and the third reinforcing fiber are made of carbon fiber, and the first resin and the third resin are made of a thermoplastic resin, The second reinforcing layer 300 may be formed such that the carbon fibers are arranged in parallel and a plurality of reinforcing layers 10 impregnated in the thermoplastic resin are repeatedly laminated to form a multilayer structure.

The first reinforcing fiber and the third reinforcing fiber in the continuous fiber form may be composed of carbon fibers and the first resin and the third resin respectively impregnating the first reinforcing fiber and the third reinforcing fiber may be composed of the same type of thermoplastic resin.

The first reinforcing layer 100 and the second reinforcing layer 300 may have a multilayer structure in which a plurality of reinforcing layers 10 are stacked. The reinforcing layers 10 are arranged in parallel Carbon fiber and a thermoplastic resin impregnated with carbon fiber, and may be constituted by CFRTPC (Continuous Fiber Reinforced Thermoplastic).

The thickness of the first reinforcing layer 100 and the thickness of the second reinforcing layer 300 can be adjusted by adjusting the number of layers of the reinforcing layer 10.

3, preferably, the reinforcing layer 10 contacting the lower surface of the shield layer 200 has the second reinforcing fiber and the metal filler between the carbon fibers, And the reinforcing layer 10 contacting the upper surface of the shielding layer 200 may include the second reinforcing fiber and the metal filler between the carbon fibers to form a second mixed layer 30 .

The first mixed layer 20 corresponds to the reinforcing layer 10 in contact with the lower surface of the shielding layer 200 in the first reinforcing layer 100 composed of the plurality of reinforcing layers 10. A part of the second reinforcing fiber and a portion of the metal filler are disposed between the carbon fibers arranged in parallel. Accordingly, the electromagnetic wave shielding function of the shielding layer 200 extends to a part of the first reinforcing layer 100, and the binding force between the shielding layer 200 and the first reinforcing layer 100 becomes strong.

Similarly, the second mixed layer 30 corresponds to the reinforcing layer 10 contacting the upper surface of the shielding layer 200 in the second reinforcing layer 300 composed of the plurality of reinforcing layers 10. A part of the second reinforcing fiber and a portion of the metal filler are disposed between the carbon fibers arranged in parallel. Accordingly, the electromagnetic shielding function of the shielding layer 200 extends to a part of the second reinforcing layer 300, and the bonding force between the shielding layer 200 and the second reinforcing layer 300 becomes strong.

The electromagnetic shielding material laminated structure composed of the first reinforcing layer 100, the shielding layer 200 and the second reinforcing layer 300 is formed by using a compression molding method, A part of the second reinforcing fiber and the metal filler mixed with the second resin of the first reinforcing layer 100 and the second reinforcing layer 300 are mixed with the first reinforcing layer 100 and the second reinforcing layer 300, (30) may be formed.

It is possible to prevent the phenomenon that the bonding force between the layers is increased compared with the method of simply manufacturing by the lamination method and the peeling from the boundary between the layers is prevented. Accordingly, the dB deviation of any two points on the first enhancement layer 100 can be within 10 dB.

Preferably, the carbon fiber is connected to the second reinforcing fiber and the metal filler in the first mixed layer 20, and the carbon fiber is mixed with the second reinforcing fiber and the metal filler in the second mixed layer 30, The laminated structure including the first reinforcing layer 100, the shielding layer 200, and the second reinforcing layer 300 may have conductivity.

The carbon fibers of the plurality of reinforcing layers 10 constituting the first reinforcing layer 100 and the second reinforcing layer 300 are in contact with each other and the carbon fibers of the second carbon layer of the second mixed layer 20, The reinforcing fibers and the metal filler are connected to the carbon fibers of the first mixed layer 20 and the second reinforcing fibers and the metal filler of the carbon fiber material included in the second mixed layer 30 are mixed with carbon The electromagnetic shielding material laminated structure composed of the first reinforcing layer 100, the shielding layer 200, and the second reinforcing layer 300 may be conductive.

As shown in FIG. 4, a pair of reinforcing layers 10 located on the central layer in the first reinforcing layer 100 and the second reinforcing layer 300 are in contact with each other, Can be formed.

The first reinforcing layer 100 and the second reinforcing layer 300 are connected to the upper and lower surfaces of the shielding layer 200 to improve the mechanical properties of the electromagnetic wave shielding material laminated structure according to the present invention. In order to improve the mechanical properties, the first reinforcing layer 100 and the second reinforcing layer 300 are formed of a plurality of reinforcing layers 10, which are located in the middle layer among the plurality of reinforcing layers 10, The two reinforcing layers 10 can have the same orientation.

Here, the central layer may mean, for example, the fourth and fifth layers from the bottom when the first reinforcing layer 100 and the second reinforcing layer 300 are composed of eight reinforcing layers 10.

More preferably, the reinforcing layers 10 stacked up and down around the reference pair 11 have the same arrangement direction as one another and are formed as a pair, and a plurality of pairs of reference layers 11, The reinforcing layer 10 may be repeatedly laminated.

The pair of reinforcing layers 10 have the same arrangement direction, one on top of the reference pair 11 and the other on the bottom of the reference pair 11. [ The first reinforcing layer 100 and the second reinforcing layer 300 may be formed by stacking a plurality of pairs of reinforcing layers 10 on the basis of the reference pair 11. Wherein the reinforcing layer 10 of the first pair 12 is stacked on the top and bottom of the reference pair 11 in order of proximity to the reference pair 11 of the plurality of reinforcing layers 10.

The reinforcing layer 10 of the pair of reinforcing layers 10 in the order of close to the reference pair 11 among the reinforcing layers 10 of the plurality of pairs is composed of an upper surface of the reinforcing layer 10 stacked on the upper surface of the reference pair 11, 11 are stacked on the lower surface of the reinforcing layer 10 stacked on the lower surface of the reinforcing layer 10. The first reinforcing layer 100 and the second reinforcing layer 300 may be composed of the reference pair 11 and a plurality of reinforcing layers 10.

The first reinforcing layer 100 and the second reinforcing layer 300 are each composed of the reference pair 11 and three pairs of the reinforcing layers 10, The first pairs of vertically connected pairs of the reference pairs 11 are perpendicular to the arrangement direction of the reference pairs 11 and the second pairs of vertically connected 13 are arranged at an angle of 45 ° with respect to the direction of arrangement of the first pair and the arrangement direction of the third pair 14 vertically connected to the second image 13 is perpendicular to the arrangement direction of the second image 13, .

That is, the first reinforcing layer 100 and the second reinforcing layer 300 are each composed of eight reinforcing layers 10, and the arrangement angle of the carbon fibers is -45 °, 45 °, 90 °, 0 ° , 0 °, 90 °, 45 °, -45 °. Here, the arrangement angle is based on the arrangement direction of the reference pair 11.

As described above, the plurality of reinforcing layers 10 are laminated so as to be symmetrical with respect to the reference pair 11, and the arraying angle is varied, thereby improving the mechanical properties such as strength and rigidity and improving the shielding performance. have.

The method for manufacturing an electromagnetic wave shielding material laminated structure according to the present invention comprises the steps of forming a first reinforcing layer (100) on a top surface of a first reinforcing layer (100) made of a composite material comprising first reinforcing fibers in the form of continuous fibers and a first resin for impregnating the first reinforcing fibers A first lamination step of laminating a shielding layer (200) comprising a second reinforcing fiber in the form of fibers, a metal filler and a second resin; And a second reinforcing layer (300) made of a composite material including a third reinforcing fiber in the form of a continuous fiber and a third resin for impregnating the third reinforcing fiber on the upper surface of the shielding layer (200) Step.

In the first laminating step, the shielding layer 200 is laminated on the upper surface of the first reinforcing layer 100. The first reinforcing layer 100 is made of a first resin that impregnates the first reinforcing fiber and the first reinforcing fiber in the form of a sheet in the form of a continuous fiber. The shielding layer 200 may be a state in which the second resin constituting the matrix is cured with a sheet form and the second reinforcing fibers in the form of a long fiber or short fiber, metal filler, etc. are mixed and dispersed in the second resin .

In the second lamination step, the second reinforcing layer 300 is laminated on the shielding layer 200 stacked on the upper surface of the first reinforcing layer 100. The second reinforcing layer 300 is made of a third resin that impregnates the third reinforcing fiber and the third reinforcing fiber in the form of a continuous fiber in sheet form.

Preferably, after the second lamination step, a laminate composed of the first reinforcing layer 100, the shielding layer 200, and the second reinforcing layer 300 is disposed in a metal mold, And a pressure step of applying a pressure of at least two arbitrary points on the laminate, wherein the dB deviation of any two points on the laminate is less than 10.

In the pressing step, the laminate formed through the first lamination step and the second lamination step is placed inside the mold, and a predetermined pressure is applied to the inside of the mold to compress the laminate. Here, the predetermined pressure applied to the laminate may be 10 to 80 kgf / cm < 2 >. The molding time can be about 1 to 3 minutes.

By manufacturing the laminated structure of the electromagnetic wave shielding material through compression molding in this manner, a part of the second reinforcing fiber and the metal filler can be disposed between the first reinforcing fibers of the first reinforcing layer 100. Accordingly, the electromagnetic wave shielding function of the shielding layer 200 extends to a part of the first reinforcing layer 100, and the binding force between the shielding layer 200 and the first reinforcing layer 100 becomes strong.

Similarly, a part of the second reinforcing fiber and a portion of the metal filler are disposed between the third reinforcing fibers of the second reinforcing layer 300. Accordingly, the electromagnetic shielding function of the shielding layer 200 extends to a part of the second reinforcing layer 300, and the bonding force between the shielding layer 200 and the second reinforcing layer 300 becomes strong.

In addition, the dB deviation of any two points on the laminate can be within 10 by applying the pressing step. This can be confirmed by the following Table 1 and FIG.

EMI shielding performance (dB) 1 point 2 points 3 points 4 points 5 points 6 locations 7 locations 8 locations 9 points Example 1 105 110 106 108 115 112 111 110 109 Example 2 114 112 106 110 108 115 115 112 107 Example 3 109 113 114 107 105 110 106 110 112 Comparative Example 1 90 110 95 102 100 115 97 93 111 Comparative Example 2 110 95 115 100 105 96 92 102 112 Comparative Example 3 100 110 97 114 98 95 111 93 101

In the case of the embodiment, a specimen having a width of 300 mm x 300 mm x 3 mm was produced through compression molding. In the comparative example, a specimen having the same size as that of the embodiment is manufactured through a general injection molding method. In the case of the comparative example, in order to compare the effective performance, a pan gate type mold was manufactured at the upper portion of the specimen in order to eliminate the problems that may occur during the molding process such as welding and unforming.

The shielding performance (dB) of Examples and Comparative Examples was measured three times in accordance with EMI ASTM D4935. In Embodiment 1, the lowest performance and the highest performance differ by 10 (dB). In Embodiment 2, the lowest performance and the highest performance differ by 8 (dB). In Embodiment 3, the lowest performance and the highest performance are 9 dB). That is, the dB deviation of any two points was formed within 10 dB.

On the other hand, Comparative Example 1 was 25 (dB), Comparative Example 2 was 23 (dB), and Comparative Example 3 was 21 (dB). It can be seen that the deviation is larger than those of the embodiments. This is a result depending on whether or not the compression molding method is used.

Although the present invention has been shown and described with respect to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It will be obvious to those who have knowledge of.

10: Enhancement Layer 11: Reference Pair
12: first pair 13: second pair
14: third pair 20: first mixed layer
30: second mixing layer 100: first reinforcing layer
200: shielding layer 300: second reinforcing layer

Claims (13)

A first reinforcing layer of a composite material comprising first reinforcing fibers in the form of continuous fibers and a first resin impregnating the first reinforcing fibers;
A second resin laminated along the top surface of said first toughening layer and integrally bonded with said first toughening layer and forming a matrix, a second reinforcement in the form of a long fiber or a short fiber dispersed in said second resin, A shielding layer comprising a fiber and a metal filler; And
A second reinforcing layer made of a composite material including a third resin that is laminated along the upper surface of the shielding layer and integrally combined with the shielding layer and impregnated with the third reinforcing fiber in a continuous fiber form, And an electromagnetic shielding material laminated structure including the electromagnetic shielding material. The method according to claim 1,
Wherein the shielding layer further comprises carbon black. The method of claim 2,
The shielding layer
Wherein the second reinforcing fiber comprises 25 to 45 parts by weight of the second reinforcing fiber, 5 to 15 parts by weight of the metal filler, and 1 to 10 parts by weight of the carbon black with respect to 100 parts by weight of the second resin. The method of claim 3,
The metal filler
And is made of at least one kind of metal selected from the group consisting of nickel (Ni), zinc (Zn), magnesium (Mg), silver (Ag)
And an average particle size of 200 to 1000 nm. The method according to claim 1,
Wherein the second reinforcing fiber is made of carbon fiber,
Wherein the second reinforcing fiber and the metal filler are connected to form a network with each other in the second resin so that the shielding layer has conductivity. The method of claim 5,
Wherein the first reinforcing fiber and the third reinforcing fiber are composed of carbon fibers,
Wherein the first resin and the third resin are composed of a thermoplastic resin,
Wherein the first reinforcing layer and the second reinforcing layer are formed such that the carbon fibers are arranged in parallel and a plurality of reinforcing layers impregnated in the thermoplastic resin are repeatedly laminated to form a multilayer structure. The method of claim 6,
The reinforcing layer abutting the lower surface of the shield layer is composed of a first mixed layer in which the second reinforcing fiber and the metal filler are positioned between the carbon fibers,
Wherein the reinforcing layer contacting the upper surface of the shielding layer comprises a second mixed layer in which the second reinforcing fibers and the metal filler are positioned between the carbon fibers. The method of claim 7,
Wherein the carbon fiber is connected to the second reinforcing fiber and the metal filler,
Wherein the second mixed layer has a laminated structure in which the carbon fiber is connected to the second reinforcing fiber and the metal filler and the first reinforcing layer, the shielding layer, and the second reinforcing layer are conductive. Material laminated structure. The method of claim 6,
Wherein the pair of reinforcing layers located on the central layer in each of the first reinforcing layer and the second reinforcing layer are in contact with each other to form a reference pair having the same arrangement direction. The method of claim 9,
The reinforcing layers stacked up and down with respect to the reference pair have the same arrangement direction and form a pair,
Wherein a plurality of pairs of reinforcing layers based on the reference pair are repeatedly laminated. The method of claim 10,
Wherein the first reinforcing layer and the second reinforcing layer each comprise the reference pair and three pairs of reinforcing layers,
The arrangement direction of the first pair vertically connected to the reference pair among the three pairs of reinforcing layers is perpendicular to the arrangement direction of the reference pair,
The arrangement direction of the second pair vertically connected to the first pair is 45 ° with the arrangement direction of the first pair,
And the arrangement direction of the third pair vertically connected to the second pair is perpendicular to the arrangement direction of the second pair. A second reinforcing fiber in the form of a long fiber, a metal filler, and a second resin on the upper surface of the first reinforcing layer made of the composite material including the first reinforcing fiber in the continuous fiber form and the first resin for impregnating the first reinforcing fiber A first laminating step of laminating a shielding layer containing the light shielding layer; And
And a second lamination step of laminating a second reinforcing layer made of a composite material including a third reinforcing fiber in the form of a continuous fiber and a third resin for impregnating the third reinforcing fiber on the upper surface of the shielding layer, (Method for manufacturing laminated structure of material). The method of claim 12,
After the second laminating step,
And a pressing step of disposing a laminate composed of the first reinforcing layer, the shielding layer and the second reinforcing layer in a mold and applying a predetermined pressure to compress the laminate, Wherein a dB deviation of the electromagnetic wave shielding material is 10 or less.

Images