KR20170055859A

KR20170055859A - ElECTROMAGNETIC WAVE SHIELDING COMPOSITE AND ARTICLE COMPRISING SAME

Info

Publication number: KR20170055859A
Application number: KR1020150159167A
Authority: KR
Inventors: 홍주형; 윤창훈; 이수민; 이수범; 최기대
Original assignee: 주식회사 엘지화학
Priority date: 2015-11-12
Filing date: 2015-11-12
Publication date: 2017-05-22

Abstract

The present invention relates to an electromagnetic wave shielding composite material and a molded article, wherein the electromagnetic wave shielding composite material includes a polymer resin, carbon fiber, and rubber. Since the composite material and the molded product according to the present invention contain the carbon fiber and the rubber of a certain size to solve a problem of impact of the conventional composite material and to improve the impact strength and shielding performance simultaneously.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding composite material,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding composite material and a molded article, and more particularly, to an electromagnetic wave shielding composite material containing carbon fiber and rubber and a molded article containing the same.

In recent years, electronic products have been miniaturized, highly integrated, and improved in performance due to the development of electronic products. Conductive materials and materials for shielding electromagnetic waves have been used.

As materials for shielding conventional electromagnetic waves, there are a metal for reflecting electromagnetic waves, a plastic as an insulating material for passing electromagnetic waves, a carbon-containing urethane or carbon-containing polystyrene for absorption and scattering of electromagnetic waves, Ferrite, and the like. As an example of concrete prior art, there has been applied a material including a metal such as zinc and lead together with aluminum having a high conductivity and iron having a high dielectric constant, and coating the glass fiber with the material.

As described above, the use of a metal such as aluminum, magnesium, or copper having a low electric resistance value is expected to have effects of heat dissipation and electromagnetic shielding. However, due to problems such as productivity and moldability, have.

In addition, although silver can be used as a conductive filler, there is a problem in terms of cost. In the carbon system, the resistance value is not sufficient for shielding electromagnetic waves, so that it is often used for antistatic. Plastic has a characteristic of transmitting most electromagnetic waves The shielding effect may be deteriorated.

The conductive filler may be included as a conductivity-imparting agent. As an additional problem that may occur when the conductive filler is used as described above, a phenomenon that the strength against impact is lowered may be exemplified. In order to overcome such a problem, there is a fear that the use of an additional additive may cause a problem that the control of the electromagnetic wave shielding performance may not be easy.

Therefore, it is required to study the optimum composition for controlling the electromagnetic wave shielding performance depending on the kind and content of the additive.

It is an object of the present invention to provide a composite material comprising carbon fiber and rubber.

Another object of the present invention is to provide a molded article containing the composite material.

In order to solve the above problems, the present invention provides a resin composition comprising a polymer resin; Carbon fiber; And rubber having an average particle size of 5 microns or less.

According to one embodiment, the polymer resin may be a thermoplastic resin.

In addition, the rubber may include those having an average particle diameter of 100 nm or more and 3 占 퐉 or less.

The content of the rubber may be 0.01 to 30 parts by weight based on 100 parts by weight of the polymer resin.

The content of the carbon fibers may be 1 to 50 parts by weight based on 100 parts by weight of the polymer resin.

Also, the content ratio of the rubber to the carbon fiber may be 1: 1 to 50.

Also, according to one embodiment, the length of the carbon fibers may be 1 to 50 mm and the diameter may be 0.01 to 10 μm.

According to one embodiment, the composite material of the present invention may have an impact strength of 5 kgf / m or more.

Further, the composite material may have an electromagnetic wave shielding ratio of 10 or more.

According to one embodiment, the thermoplastic resin may be at least one selected from the group consisting of a nylon resin, a polyethylene resin, a polyamide resin, a polyester resin, a polycarbonate resin, a polyarylate resin and a cycloolefin resin.

Further, the rubber may be a group including a styrene butadiene rubber, a polychloroprene rubber, a nitrile rubber, a butyl rubber, a butadiene rubber, an isoprene rubber, an ethylene propylene rubber, a polysulfide rubber, a silicone rubber, a fluoro rubber, &Lt; / RTI >

In addition, the carbon fiber may be at least one selected from the group including rayon based, pitch based and polyacrylonitrile based.

According to one embodiment, the composite material may be selected from the group consisting of an antimicrobial agent, a release agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, a dye, an inorganic additive, a surfactant, a nucleating agent, a coupling agent, a filler, a plasticizer, an impact modifier, , Antistatic agents, pigments, flame retardants, and mixtures of one or more of the foregoing.

Further, according to the present invention, it is possible to provide an electromagnetic wave shielding molded article including such a composite material.

Other details of the embodiments of the present invention are included in the following detailed description.

According to the electromagnetic wave shielding composite material and the molded article containing the electromagnetic wave shielding composite material according to the present invention, the electromagnetic wave shielding performance can be improved at the same time while maintaining the impact strength, so that the electromagnetic wave shielding composite material can be effectively applied to electromagnetic wave shielding products requiring impact strength.

1 is a schematic view of an electromagnetic wave shielding composite material.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As used herein, the term "composite material" may be used interchangeably with "composite material" in the present specification, and may be understood to mean a material formed by combining two or more materials.

In addition, the term "electromagnetic wave shielding performance" can be described in combination with "electromagnetic wave shielding ability, electromagnetic wave shielding efficiency or electromagnetic wave shielding efficiency" within the context of the present invention. It can be understood that the transmission efficiency is further increased.

Hereinafter, the electromagnetic wave shielding composite material and the molded article containing the electromagnetic wave shielding composite material according to embodiments of the present invention will be described in detail.

Shielding of electromagnetic waves means that a specific part of the space is surrounded by a conductor or a ferromagnetic material so that the inside of the shielded object is not influenced by an external electromagnetic field or conversely an electromagnetic field generated in the inside does not affect the outside .

Electromagnetic wave shielding can be achieved by reflection, absorption, and passage of electromagnetic waves. Among them, electromagnetic wave absorption can be divided into conductive wave absorption, dielectric wave absorption and magnetic wave absorption depending on the material.

The electromagnetic wave shielding composite according to the present invention comprises a polymer resin; Carbon fiber; And rubber.

By using the carbon fiber as the conductive filler, the composite material has excellent mechanical properties as compared with the case of using the carbon nanotubes, and since the carbon nanotube has a bulk density higher than that of the carbon fiber, Since the amount of filler is limited, the electromagnetic wave shielding property of the composite material using carbon fiber is more excellent.

The carbon fibers may be classified according to the precursor, and may include, for example, Rayon, pitch, and polyacrylonitrile carbon fibers. More specifically, High-modulus carbon fiber (HM-CF) manufactured from a high-strength carbon fiber and a high-strength carbon fiber (HS-CF) produced from a PAN system.

The rayon-based carbon fiber may include a special grade of viscose rayon having few defects. The pitch used for the production of the pitch-based carbon fiber may include a petroleum pitch and a coal pitch.

The PAN-based carbon fibers can be prepared by preparing PAN precursor fibers and stabilizing, carbonizing, and graphitizing the precursor fibers. When PAN is used as a starting material and stabilized at appropriate temperature and time, The precursor material has a thermally stable ladder structure to withstand the carbonization process by chain cleavage, crosslinking, dehydrogenation reaction and cyclization reaction, and the carbonization yield can be improved.

In addition, the physical properties such as the tensile elastic modulus of the carbon fiber may be influenced by the conditions such as the heat treatment temperature during the process. Therefore, a catalyst such as a boron compound may be used to reduce the temperature and time required for the carbon fiber manufacturing process.

The carbon fibers may have a length of, for example, 1 to 50 mm, a diameter of 0.01 to 10 μm and a strength of 5 to 100 g / d, for example, a length of 1 to 20 mm, a diameter of 0.1 to 5 μm and a strength of 5 to 50 g / d. Most preferably, it may have a length of 6 to 12 mm, a diameter of 0.5 to 1 μm and a strength of 10 to 20 g / d, and may include, for example, a carbon fiber composed of carbon nanotubes in the form of a rigid random coil . The carbon nanotubes in the upright random coil form have an effective bending modulus greater than thermal energy (kT, where k is a Boltzmann constant and T is an absolute temperature) Can be defined as carbon nanotubes that do not undergo elastic deformation due to the particle size and the total size of the particles (inter-terminal distance) is linearly proportional to the square root of the apparent molecular weight.

When the composite material contains carbon fibers under the above-described conditions, the impact strength and the effect on electromagnetic wave shielding can be optimized.

According to one embodiment, when the content of the carbon fibers is excessive, moldability may be deteriorated. When the content is small, durability and the like may be lowered. For example, when 100 parts by weight of the polymer resin is used 1 to 50 parts by weight, and as a specific example, 1 to 30 parts by weight may be included.

In addition, the rubber can be shielded from electromagnetic waves by bonding with a filler including a polymer resin and a carbon fiber, and a difference in bonding degree between the rubber and the filler may occur depending on the size of the rubber particle, have. When rubber having a large particle diameter is used, the impact strength may be improved, but the electromagnetic wave shielding performance may be deteriorated by interfering with the connection between the composite materials. Therefore, by using a rubber having a small particle diameter, It is possible to improve the problem of deterioration of the electromagnetic wave shielding performance which can be incidentally accompanied by the electromagnetic wave shielding effect. For example, the rubber may have a particle diameter of 5 μm or less, specifically, a rubber having a particle diameter of 100 nm or more and 3 μm or less. For example, rubber having a particle diameter of 5 占 퐉 or less can be mixed and used. Concretely, it is possible to use a rubber having a particle diameter of 5 占 퐉 and a rubber having a diameter of 3 占 퐉. In the present specification, the particle diameter of the rubber means the average particle diameter.

According to one embodiment, when the content of the rubber is excessive, the heat resistance and the like may be lowered. When the content is low, the moldability and the shielding ratio may be lowered. For example, 100 parts by weight of the polymer resin And may be 0.01 to 30 parts by weight, for example, 0.1 to 30 parts by weight, and more specifically 0.1 to 20 parts by weight.

The kind of the rubber is not particularly limited and may be a kind that can be used in the related art. Examples of the rubber include styrene butadiene rubber (SBR), polychloroprene rubber (CR), nitrile rubber butadiene rubber (NBR), isoprene-isobutylene rubber (IIR), butadiene rubber (BR), isoprene rubber (IR), ethylene propylene rubber (EPR) And may be at least one selected from the group consisting of polysulfide rubber, silicone rubber, fluororubber, urethane rubber and acrylic rubber, and the like.

According to one embodiment, physical properties such as impact strength and electromagnetic wave shielding performance may vary depending on the content ratio of the rubber and the carbon fiber. For example, the content ratio of the rubber to the carbon fiber may be 1: 1 to 50, and for example, the content ratio of the rubber and the carbon fiber may be 1: 2 to 30 Lt; / RTI >

According to one embodiment, the polymer resin may include, for example, a thermosetting resin, a thermoplastic resin or a photocurable resin, and specific examples may include a thermoplastic resin.

As the thermosetting resin, for example, polyamide, polyether, polyimide, polysulfone, epoxy resin, unsaturated polyester resin and phenol resin can be used. As the photo-curing resin, for example, a radical curing resin (Epoxy resin, oxetane resin, vinyl ether-based resin) and the like can be used as the polymerizable monomer (for example, an acrylic oligomer, an unsaturated polyester, or an ester polymer such as a monomer, a polyester acrylate, a urethane acrylate and an epoxy acrylate) As the thermoplastic resin, for example, a nylon resin, a polyethylene resin, a polyamide resin, a polyester resin, a polycarbonate resin, a polyarylate resin, a cycloolefin resin and the like can be used.

Particularly, the thermoplastic resin can be used without limitation as long as it is used in the art, and examples thereof include polycarbonate resin, polypropylene resin, polyamide resin, aramid resin, aromatic polyester resin, polyolefin resin, polyester carbonate resin, poly But are not limited to, phenylene ether resins, polyphenylenesulfide resins, polysulfone resins, polyethersulfone resins, polyarylene resins, cycloolefin resins, polyetherimide resins, polyacetal resins, polyvinyl acetal resins, A polyetherketone resin, a polyetherketone resin, a ketone resin, a polyetheretherketone resin, a polyarylketone resin, a polyether nitrile resin, a liquid crystal resin, a polybenzimidazole resin, a polypararbasanic resin, an aromatic alkenyl compound, a methacrylic acid ester, At least one member selected from the group consisting of Aromatic vinyl compound copolymer resin, a vinyl-based polymer or copolymer resin obtained by polymerization or copolymerization of a vinyl monomer, a vinyl aromatic compound, a vinyl aromatic compound, a vinyl aromatic compound, At least one or more selected from the group consisting of N-phenylmaleimide copolymer resin, N-phenylmaleimide copolymer resin, vinyl cyanide- (ethylene-diene-propylene (EPDM)) -aromatic alkenyl compound copolymer resin, polyolefin, vinyl chloride resin and chlorinated vinyl chloride resin Can be used. The specific types of these resins are well known in the art and can be suitably selected by those skilled in the art.

The polyolefin resin may be, for example, polypropylene, polyethylene, polybutylene, and poly (4-methyl-1-pentene), and combinations thereof, but is not limited thereto. In one embodiment, the polyolefins include polypropylene homopolymers (e.g., atactic polypropylene, isotactic polypropylene, and syndiotactic polypropylene), polypropylene copolymers (e.g., For example, polypropylene random copolymers), and mixtures thereof. Suitable polypropylene copolymers include but are not limited to the presence of comonomers selected from the group consisting of ethylene, but-1-ene (i.e., 1-butene), and hex-1-ene Lt; RTI ID = 0.0 > of propylene. &Lt; / RTI > In such polypropylene random copolymers, the comonomer may be present in any suitable amount, but is typically present in an amount of up to about 10 wt% (e.g., from about 1 to about 7 wt%, or from about 1 to about 4.5 wt%) Can exist.

The polyester resin is a homopolyester or a copolymer polyester which is a polycondensation product of a dicarboxylic acid component skeleton and a diol component skeleton. Examples of the homopolyester include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, poly-1,4-cyclohexanedimethylene terephthalate, . Particularly, since polyethylene terephthalate is inexpensive, it can be used in a wide variety of applications, which is preferable. The copolymer polyester is defined as a polycondensate comprising at least three or more components selected from the following components having a dicarboxylic acid skeleton and a component having a diol skeleton. Examples of the component having a dicarboxylic acid skeleton include terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, -Diphenyl dicarboxylic acid, 4,4'-diphenylsulfone dicarboxylic acid, adipic acid, sebacic acid, dimeric acid, cyclohexanedicarboxylic acid and ester derivatives thereof. Examples of the component having a glycol skeleton include ethylene glycol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, diethylene glycol, polyalkylene glycol, 2,2- 4'-p-hydroxyethoxyphenyl) propane, isosorbate, 1,4-cyclohexanedimethanol, spiroglycol and the like.

As the polyamide resin, nylon resin, nylon copolymer resin, and mixtures thereof can be used. Examples of the nylon resin include polyamide-6 (nylon 6) obtained by ring-opening polymerization of a lactam such as? -Caprolactam or? -Dodecaractam commonly known in the art; Nylon polymers obtained from amino acids such as aminocaproic acid, 11-amino undecanoic acid, and 12-aminododecanoic acid; But are not limited to, ethylenediamine, tetramethylenediamine, hexamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, , Metaxylenediamine, para-xylenediamine, 1,3-bisaminomethylcyclohexane, 1,4-bisaminomethylcyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, bis Aminocyclohexyl) methane, bis (4-aminocyclohexyl) propane, bis (aminopropyl) piperazine, aminoethylpiperidine, etc. Alicyclic or aromatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid, terephthalic acid, 2-chloroterephthalic acid and 2-methylterephthalic acid, etc. A nylon polymer obtainable from the polymerization of Copolymers or mixtures thereof may be used. Examples of the nylon copolymer include copolymers of polycaprolactam (nylon 6) and polyhexamethylene sebacamide (nylon 6,10), copolymers of polycaprolactam (nylon 6) and polyhexamethyleneadipamide (nylon 66) And copolymers of polycaprolactam (nylon 6) and polylauryl lactam (nylon 12).

The polycarbonate resin may be prepared by reacting a diphenol with phosgene, a halogen formate, a carbonic ester, or a combination thereof. Specific examples of the diphenols include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, 2,2-bis (4-hydroxyphenyl) propane (also referred to as bisphenol- (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis Bis (3,5-dimethyl-4-hydroxyphenyl) propane, 2,2-bis Bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) ketone, bis (4-hydroxyphenyl) Ether, and the like. Of these, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane or 1,1- Cyclohexane may be used, and more preferably 2,2-bis (4-hydroxyphenyl) propane may be used.

The polycarbonate resin may be a mixture of copolymers prepared from two or more diphenols. The polycarbonate resin may be a linear polycarbonate resin, a branched polycarbonate resin, or a polyester carbonate copolymer resin.

Examples of the linear polycarbonate resin include a bisphenol-A polycarbonate resin and the like. Examples of the branched polycarbonate resin include those prepared by reacting a polyfunctional aromatic compound such as trimellitic anhydride, trimellitic acid and the like with a diphenol and a carbonate. The polyfunctional aromatic compound may be contained in an amount of 0.05 to 2 mol% based on the total amount of the branched polycarbonate resin. Examples of the polyester carbonate copolymer resin include those prepared by reacting a bifunctional carboxylic acid with a diphenol and a carbonate. As the carbonate, diaryl carbonate such as diphenyl carbonate, ethylene carbonate and the like can be used.

Examples of the cycloolefin-based polymer include a norbornene-based polymer, a monocyclic olefin-based polymer, a cyclic conjugated diene-based polymer, a vinyl alicyclic hydrocarbon polymer, and hydrides thereof. Specific examples thereof include APEL (an ethylene-cycloolefin copolymer produced by Mitsui Chemicals, Inc.), Aton (a norbornene-based polymer manufactured by JSR Corporation), and Zeonoa (a norbornene-based polymer manufactured by Nippon Zeon).

According to one embodiment, at least one of polycarbonate, polyacrylonitrile-butadiene-styrene, polyester carbonate, polypropylene and polyolefin may be used as the polymer resin.

According to one embodiment, the electromagnetic wave shielding composite according to the present invention may have a shielding performance, that is, an electromagnetic wave shielding rate of 10 dB or more, for example, a shielding rate of 12 dB or more.

Further, it may have an impact strength of 5 kgf / m or more, for example, an impact strength of 8 kgf / m or more.

According to one embodiment, the electromagnetic wave shielding composite according to the present invention may be used as an electromagnetic wave shielding composite material in the form of an antimicrobial agent, a releasing agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, a dye, an inorganic additive, a surfactant, a nucleating agent, a coupling agent, An additive selected from the group consisting of an additive, a colorant, a lubricant, an antistatic agent, a pigment, a flame retardant, and a mixture of at least one of the foregoing. Such additives may be included within a range that does not affect the physical properties such as impact strength and electromagnetic wave shielding performance of the composite material and the molded article according to the present invention, and may be 0.1 to 5 parts by weight, based on 100 parts by weight of the polymer resin, 0.1 to 3 parts by weight.

The electromagnetic wave shielding composite material of the present invention can be applied to an electromagnetic wave shielding product requiring impact strength by forming a molded product by extrusion, injection or extrusion and injection molding to form a molded product. However, And can be suitably used, and is not limited to the above description.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Examples 1 to 3 and Comparative Examples 1 to 9: Manufacture of electromagnetic wave shielding composite material

The compositions according to the following Table 1 were mixed to prepare respective composites.

The content of each composition was based on the weight of the polymer resin, and a polycarbonate resin (LUPOY1030) was used as the thermoplastic resin as the polymer resin.

In addition, carbon fibers having a length of 6 to 12 mm, a diameter of 0.5 to 1.0 μm and a strength of 10 to 20 g / d were used, and DP270 of LG Chemical was used as a rubber.

division Carbon fiber content
(Parts by weight) Rubber content
(Parts by weight) Polymer resin content
(Parts by weight) Rubber particle size
(μm) Example 1 10 7.5 82.5 <3 Example 2 20 7.5 72.5 <3 Example 3 30 7.5 62.5 <3 Comparative Example 1 10 - 90 - Comparative Example 2 10 7.5 82.5 5 to 10 Comparative Example 3 10 7.5 82.5 > 10 Comparative Example 4 20 - 80 - Comparative Example 5 20 7.5 72.5 5 to 10 Comparative Example 6 20 7.5 72.5 > 10 Comparative Example 7 30 - 70 - Comparative Example 8 30 7.5 62.5 5 to 10 Comparative Example 9 30 7.5 62.5 > 10

Production Example 1: Production of molded product specimen

Each of the composites according to Table 1 was extruded from a twin-screw extruder (L / D = 42, Φ = 40 mm) while raising the temperature profile to 280 ° C. to prepare pellets having a size of 2 mm × 2.5 mm × 2.5 mm .

The prepared pellets were injected from an extruder under a flat profile condition at an injection temperature of 280 ° C to prepare specimens having a thickness of 3.2 mm, a length of 12.7 mm and a dog-bone shape.

Experimental Example 1: Measurement of Impact Strength

The respective specimens prepared from Production Example 1 were measured in accordance with ASTM D256.

Experimental Example 2: Measurement of shielding performance

The electromagnetic wave shielding performance was measured for each of the specimens prepared in Production Example 1 using an electromagnetic wave shielding meter (E 8362B Aglient).

The results of Experimental Examples 1 and 2 are shown in Table 2 below.

division Impact strength
(kgf / m) Shielding performance
(dB) Example 1 8 12 Example 2 8 21 Example 3 9 33 Comparative Example 1 6 10 Comparative Example 2 9 7 Comparative Example 3 9 5 Comparative Example 4 6 20 Comparative Example 5 9 16 Comparative Example 6 9 12 Comparative Example 7 6.5 30 Comparative Example 8 10 27 Comparative Example 9 10 25

As shown in Table 2, when the contents of the carbon fibers in Example 1, Comparative Examples 2 and 3, Example 2 and Comparative Examples 5 and 6, and Example 3 and Comparative Examples 8 and 9 were compared, It can be seen that the electromagnetic wave shielding performance of the embodiment is higher than that of the comparative example.

Therefore, as can be seen from the above, it can be confirmed that the electromagnetic wave shielding composite material and the molded product according to the present invention can improve the electromagnetic wave shielding performance and maintain the impact strength.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. something to do. It is therefore intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

Claims

Polymer resin;
Carbon fiber; And
An electromagnetic wave shielding composite comprising a rubber having an average particle size of 5 microns or less.

The method according to claim 1,
Wherein the polymer resin is a thermoplastic resin.

The method according to claim 1,
Wherein an average particle diameter of the rubber is 100 nm or more and 3 占 퐉 or less.

The method according to claim 1,
Wherein the content of the rubber particles is 0.01 to 30 parts by weight based on 100 parts by weight of the polymer resin.

The method according to claim 1,
Wherein the content of the carbon fibers is 1 to 50 parts by weight based on 100 parts by weight of the polymer resin.

The method according to claim 1,
Wherein the content ratio of the rubber to the carbon fiber is 1: 1 to 50.

The method according to claim 1,
Wherein the carbon fibers have a length of 1 to 50 mm and a diameter of 0.01 to 10 μm.

The method according to claim 1,
Wherein the impact strength is not less than 5 kgf / m.

The method according to claim 1,
Wherein the electromagnetic wave shielding ratio is 10 or more.

3. The method of claim 2,
Wherein the thermoplastic resin is at least one selected from the group consisting of a nylon resin, a polyethylene resin, a polyamide resin, a polyester resin, a polycarbonate resin, a polyarylate resin and a cycloolefin resin.

The method according to claim 1,
Wherein the rubber is selected from the group consisting of styrene butadiene rubber, polychloroprene rubber, nitrile rubber, butyl rubber, butadiene rubber, isoprene rubber, ethylene propylene rubber, polysulfide rubber, silicone rubber, fluoro rubber, urethane rubber and acrylic rubber Or more than one of the electromagnetic wave shielding composites.

The method according to claim 1,
Wherein the carbon fibers are at least one selected from the group including rayon based, pitch based and polyacrylonitrile based ones.

The method according to claim 1,
A surfactant, a nucleating agent, a coupling agent, a filler, a plasticizer, an impact modifier, an admixture, a coloring agent, a lubricant, an antistatic agent, a pigment, a flame retardant agent and the like, which are used in combination with an antioxidant, a releasing agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, &Lt; / RTI > and mixtures of one or more of the foregoing.

An electromagnetic wave shielding molded article comprising the composite material according to any one of claims 1 to 13.