JPS6227450A - Flame-retardant resin composition for electromagnetic wave shielding - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent flame retardance and electromagnetic wave shielding properties, consisting of a thermoplastic resin contg. a styrene resin, copper and/or brass fiber, a halogen-contg. org. compd, and an inorg. flame retardant aid. CONSTITUTION:20-1,000pts.wt. copper fiber and/or brass fiber (A) having a diameter of 20-150mum and a length of 1-10mm, 2-50pts.wt. halogen-contg. org. compd. (B) (e.g. haxabromobenzene) composed of an arom. bromine compd. having an MW of 600 or below and 1-50pts.wt. (per 100pts.wt. component B) inorg. flame-retardant aid (e.g. Sb2O3) are blended with 100pts.wt. thermoplastic resin contg. at least styrene resin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flame-retardant resin composition for electromagnetic shielding that has excellent flame retardancy and electromagnetic shielding properties.

(Prior Art) Integrated circuits (ICs) built into electronic devices such as computers and VTRs meet two social needs.

Efforts are being made to make it smaller and faster. As a result, the current used in the IC becomes a very small current, and as a result, electromagnetic disturbances such as malfunctions and video disturbances due to external electromagnetic waves are likely to occur, which is a major problem today. In addition, automobile parts are becoming more and more electronic as well as resinous, and there are concerns that electronic parts may malfunction due to electromagnetic waves.

In order to reduce such electromagnetic interference, attempts have been made to impart electrical conductivity to electronic device housings and plastic automobile parts. Various methods have been adopted for shielding against electromagnetic waves. For example, there is a method of shielding electromagnetic waves by using metal as part of the material to absorb or reflect electromagnetic waves. Furthermore, electromagnetic waves are shielded by spraying, vapor depositing, painting, or plating metal on the surface of plastic. but.

These methods produce materials with a high specific gravity.

Processability is difficult. There are drawbacks such as the metal peeling off due to impact etc. Another method is to mix conductive additives such as carbon powder, carbon fiber, or metal powder into plastic. However, if only a small amount of these additives are mixed in,
Electromagnetic shielding effect is not sufficient. If a large amount is mixed in, the mechanical strength of the material will be significantly reduced. In order to solve these drawbacks, attempts have been made to incorporate metal fibers into the resin.

On the other hand, plastic electronic devices and automobile parts are required to be flame retardant for fire safety reasons. Flame retardant is added to resin to make it flame retardant. Flame retardants include chlorinated flame retardants such as chlorinated polystyrene and chlorinated paraffin.

There are phosphorus flame retardants such as triphenyl phosphate and tricresyl phosphate, and phosphorus-halogen flame retardants such as tris (chloroethyl) phosphate and tris (dichloropropyl) phosphate.

For these reasons, there is a need for a resin composition that has both flame retardancy and electromagnetic wave shielding properties and does not deteriorate the physical properties such as the mechanical properties of the material. Japanese Patent Publication No. 59-155448
No. 59-187045 discloses a resin composition in which aluminum fibers or aluminum alloy fibers are added to a styrene resin, and a halogen-containing organic compound is further added. However, aluminum fibers or aluminum alloy fibers generally have weak electromagnetic shielding properties. To improve electromagnetic shielding.

It is necessary to add a large amount of aluminum fiber or aluminum alloy fiber to the resin. Adding a large amount of such metal fibers will significantly reduce the moldability and physical properties of the resin composition. It is known that copper or brass has higher electromagnetic shielding properties than aluminum or aluminum alloy. For example, in order to make a thermoplastic resin containing at least styrene resin have a volume resistivity of 10-2Ω・0m or less, which is effective for electromagnetic shielding, the volumetric light content in the resin must be 10% copper. While it is sufficient to add a small amount such as 15% or less for aluminum or aluminum alloy, it is necessary to add an excess amount of 25% or more for aluminum or aluminum alloy.

Addition of such excessive amounts of aluminum or aluminum alloy reduces the mechanical strength of the material. Therefore,
There is a need to add a small amount of copper fibers and/or brass fibers, which have good electromagnetic shielding effects, to resins and also to make them flame retardant.

JP-A-60-1251 discloses a composition in which a polyphenylene ether resin is blended with metal fibers and a phosphate compound. Copper fibers and/or brass fibers are mentioned here as metal fibers. However, sufficient flame retardancy cannot be obtained only by adding a small amount of a phosphate compound used as a flame retardant. If added in large amounts, the mechanical properties and heat distortion temperature of the material will decrease. Also, when molding resin.

Flame retardants cause thermal decomposition, which can cause discoloration of molded products and corrosion of molds. Therefore, phosphate compounds are not suitable as flame retardants for resin compositions containing copper fibers and/or brass fibers.

Ultimately, what is a flame retardant with excellent flame retardant performance for resin compositions containing copper fibers and/or brass fibers?

It has not been discovered yet.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and its purpose is to provide high electromagnetic shielding properties, flame retardance, and moldability. 2. It is an object of the present invention to provide a flame-retardant resin composition for electromagnetic shielding that also has excellent mechanical properties.

(Means for Solving the Problems) The present invention adds an aromatic bromine compound having a molecular weight of 600 or less to a resin composition to which copper fibers and/or brass fibers have been added. It provides excellent electromagnetic shielding properties and flame retardancy that were previously unavailable.

It was completed based on the inventor's knowledge.

The flame retardant resin composition for electromagnetic shielding of the present invention is as follows.

Thermoplastic resin containing at least styrene resin.

It contains copper fibers and/or brass fibers, a halogen-containing organic compound, and an inorganic flame retardant aid, thereby achieving the above object.

The thermoplastic resin containing at least a styrenic resin is composed of a homopolymer, a copolymer, and a mixture thereof having at least one styrene monomer unit. One styrene monomer unit is represented by a formula such as 2, for example, the following formula.

-C-CHt - (A), l (where R is hydrogen or a lower alkyl group, A is a halogen atom or a lower alkyl group, and n is an integer of O to 5).

) Such thermoplastic resins include 2 e.g. polystyrene,
There are high impact polystyrenes, ABS resins, styrene-butadiene copolymers, α-methylstyrene modified polystyrenes, α-methylstyrene modified ABS resins and styrene modified polyphenylene oxide resins.

Copper fibers and/or brass fibers are manufactured by, for example, a method utilizing a chatter phenomenon, a melt spinning method, or a focused wire drawing method. There are no particular restrictions on the size of the fibers. However, if we consider the moldability of the resin and the dispersibility of the fibers in the resin,
It is desirable that the fibers have a thickness of 20 μm to 150 μm and a length of 1 nm to 101 m. Copper fibers and/or brass fibers may be added as long as they do not significantly reduce conductivity.
Zinc, aluminum, aluminum alloy, stainless steel,
Metal fibers such as nickel and mild steel, metal powders, carbon fibers, etc. may be mixed. In addition, the surface of the fiber is coated with silane to improve adhesion to the resin.

It may also be treated with a camping agent such as a titanate.

The amount of these copper fibers and/or brass fibers to be added is generally expressed as a percentage of the volume of the resin composition. The amount added is 2 to 50%, preferably 5 to 25%.

If it is less than 2%, desired electromagnetic shielding properties cannot be obtained. When it exceeds 50%, it becomes difficult to mold the resin and the mechanical strength of the resulting resin molded product decreases. When the amount added is expressed on a weight basis, for 100 parts by weight of the resin component,
The amount is 20 to 1000 parts by weight, preferably 50 to 300 parts by weight.

Copper and brass have better heat storage properties than aluminum and aluminum alloys. Therefore, resin compositions containing copper fibers and/or brass fibers are more difficult to flame retard than resin compositions containing aluminum fibers or aluminum alloy fibers. Even when a halogen-containing organic compound, which is commonly used for flame retardant resin compositions containing aluminum fibers or aluminum alloy fibers, is applied to resin compositions containing copper fibers and/or brass fibers, sufficient flame retardance is not obtained. No effect is obtained. According to the present inventors, the desired flame retardant effect was obtained by using an aromatic bromine compound with a molecular weight of 600 or less as a flame retardant for a resin composition containing copper fibers and/or brass fibers.

Such a low molecular weight aromatic bromine compound vaporizes or thermally decomposes during combustion of the resin, thereby producing an endothermic effect. Due to heat absorption during combustion.

Because the heat storage properties of copper and brass are negated.

The resin is made flame retardant. Aromatic bromine compounds with a molecular weight exceeding 600 do not vaporize or thermally decompose even when the resin is burned. Therefore, such compounds.

It is not effective as a flame retardant for resin compositions containing copper fibers and/or brass fibers.

Examples of aromatic bromine compounds having a molecular weight of 600 or less include hexabromobenzene, pentabromotoluene, pentabromophenol, and tetrabromobisphenol A. Particularly suitable are hexabromobenzene and pentabromotoluene. The amount of the aromatic bromine compound added is 2 to 50 parts by weight, preferably 2 to 50 parts by weight, based on 100 parts by weight of the resin component.
It is 5 to 30 parts by weight. If it is less than 2 parts by weight, the desired flame retardant effect cannot be obtained. When it exceeds 50 parts by weight, the mechanical strength of the resin molded product decreases. These aromatic bromine compounds with a molecular weight of 600 or less can be used in combination with other halogen-based flame retardants to reduce the price and improve the physical properties of resin compositions, as long as they do not significantly reduce flame retardancy and mechanical properties. ,
It may be used in combination with a phosphorus flame retardant and a phosphorus-halogen flame retardant.

Examples of inorganic flame retardant aids include antimony dioxide, antimony pentoxide, and zirconium oxide.

By adding such an inorganic flame retardant aid.

The flame retardant effect is improved by the mutual effect with the above flame retardant.

The amount of flame retardant aid added is 1 to 50 parts by weight, preferably 15 to 30 parts by weight, per 100 parts by weight of the halogen-containing organic compound.
Parts by weight. If it is less than 1 part by weight.

No effect as a flame retardant aid. If more than 50 parts by weight of the flame retardant auxiliary agent is added, the flame retardant effect is not significantly improved and the physical properties of the resin composition are adversely affected.

For example, there is one method for producing the resin composition of the present invention.

There is a method in which a resin component, copper fibers and/or brass fibers, a flame retardant, and a flame retardant aid are simultaneously blended, kneaded, and molded. There is also a method in which copper fibers and/or brass fibers are added to the resin component and pelletized, and then a flame retardant and a flame retardant are added thereto. or.

A flame retardant and a flame retardant aid may be added to the resin component to form pellets, and copper fibers and/or brass fibers may be added to the pellets. A masterbatch method is also used, in which a resin component is blended with high-concentration additives and made into pellets.

An antioxidant, a metal deterioration inhibitor, a filler, etc. may be added to the resin composition of the present invention within a range that does not affect its physical properties. Known molding methods such as extrusion molding, injection molding, and press molding can be used to mold the resin composition.

(Example) The present invention will be described below with reference to examples.

15 parts by volume of brass fibers were mixed with 85 parts by volume of Ohba Kaiko ABS resin. Based on 100 parts by weight of this resin formulation.

Furthermore, hexabromobenzene (HB B ) 12ff
i volume part.

Blending 2 parts by weight of antimony dioxide (Sb20.),
- Mixed in a blender at 30°C for 115 minutes. The resulting mixture was pelletized using a twin screw extruder. Injection temperature of each pellet 240°C1 injection pressure 80 kg/cn
A test piece was prepared by injection molding. The obtained test piece was evaluated for electromagnetic shielding properties, flame retardance, and mechanical strength. The electromagnetic wave shielding property is 9 volume specific resistance value (Ω
・cm) was used as the evaluation standard. Volume specific resistance value (Ω・c
m) was measured using a shielding effect evaluator (Takeda Riken, TR17301) using a Wheatstone bridge. Flame retardant: Under Rafter Laboratory (UL)
Evaluation was made according to the 94 Flame Resistance Test Standard. Mechanical strength is
The measured value of notched izot impact strength was used as the standard. The results of these tests are shown in Tables 1 and 2.

This example is the same as Example 1 except that zirconium oxide (Z, O□) was used instead of antimony trioxide (Sb2σ3). The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength.

The results are shown in Tables 1 and 2.

Misapplication 1 Same as Example 1 except that pentabromotoluene (PBT) was used instead of hexabromobenzene (HBB). The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

↓ Instead of hexabromobenzene (HBB), pentabromotoluene (PBT) and antimony dioxide (Sbz
It is the same as Example 1 except that zirconium oxide (Z10□) was used instead of O:+). The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Example 1 except that pentabromophenol (PBP) was used instead of hexabromobenzene (HBB)
It is similar to The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Dai practice i Hexabromobenzene (i (B
It is the same as Example 1 except that O□) was used. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Example 1 except that 15 parts by weight of tetrabromobisphenol A (TBA) and 3 parts by weight of antimony trioxide (Sb203) were used instead of ethexabromobenzene (HBB). It is similar to The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

(1) Same as Example 1 except that 7 parts by volume of copper fibers were added instead of brass fibers to 93 parts by volume of ABS resin. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Example 9 The same as Example 8 except that pentabromotoluene (PBT) was used instead of hexabromobenzene (HBB). The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

The procedure was the same as in Example 8 except that pentabromophenol (PBP) was used instead of hexabromobenzene (HBB). The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Same as Example 8 except that instead of hexabromobenzene (HBB), 15 parts by weight of tetrabromobisphenol A (TBA) and 3 parts by weight of antimony trioxide (SbzO3) were used. . The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Using styrene-modified polyphenylene oxide (PPO) resin instead of Omicho ABS resin, hexabromobenzene (HB)
Except that B) was 10 parts by weight.

This is the same as in Example 1. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Example 13 Example 12 except that pentabromotoluene (PBT) was used instead of hexabromobenzene (HBB).
It is similar to The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Fuse Kaidan Styrene modified polyphenylene oxide (PPO) resin 9
The same as in Example 12 except that 7 parts by volume of copper fibers were added instead of brass fibers to 3 parts by volume. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 1 and 2.

Leaving box U Styrene-modified polyphenylene oxide (PPO) resin 9
Same as Example 12, except that 7 parts by volume of copper fiber was added instead of brass fiber to 3 parts by volume, and pentabromotoluene (PBT) was used instead of hexabromobenzene (HBB). . The obtained test piece was subjected to electromagnetic shielding properties similar to those in Example 1.

It was subjected to flame retardancy and mechanical strength tests. The results are shown in Tables 1 and 2.

The procedure was the same as in Example 1 except that decabromobiphenyl oxide (DBBPO) was used instead of hexabromobenzene (HBB). The obtained test piece was used in Example 1.
Similar electromagnetic shielding properties.

It was subjected to flame retardancy and mechanical strength tests. The results are shown in Tables 3 and 4.

Comparative Example 1 was the same as Comparative Example 1, except that 25 parts by weight of decabromo biphenyl oxide (DBBPO) and 4 parts by weight of antimony trioxide (SbZOff) were used.

The obtained test piece was tested for electromagnetic shielding properties similar to those in Example 1,
It was subjected to flame retardancy and mechanical strength tests.

The results are shown in Tables 3 and 4.

Comparative Example 1 was the same as Comparative Example 1, except that 30 parts by weight of decabromobiphenyl oxide (DBBPO) and 5 parts by weight of antimony trioxide (Sb2Off) were used.

The obtained test piece was tested for electromagnetic shielding properties similar to those in Example 1,
It was subjected to flame retardancy and mechanical strength tests.

The results are shown in Tables 3 and 4.

Hexabromobenzene (HBB) was replaced with 25 parts by weight of decabromobiphenyl oxide (DBBPO) and antimony trioxide (SbzOz) was replaced.

The same as Example 8 except that 4 parts by weight of zirconium oxide (Z, 0□) was used. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 3 and 4.

Comparison basis 1 30 parts by weight of decabromo biphenyl oxide (DBBPO) was used in place of hexabromobenzene (HBB), and 5 parts by weight of zirconium oxide (Z, 0□) was used in place of antimony trioxide (SbzO:+). The rest is the same as in Example 8. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 3 and 4.

This was mixed with 85 parts by volume of Hibiki ABS resin, 15 parts by volume of aluminum fibers instead of brass fibers, and decabromobiphenyl oxide (instead of hexabromobenzene (HBB)).
30 parts by weight of DBBPO) and antimony trioxide (S
It is the same as Example 1 except that zirconium oxide (Z, 0□) was used instead of bzO:+). The obtained test piece was tested for electromagnetic shielding properties similar to those in Example 1, and j! It was subjected to flammability and mechanical strength tests. The results are shown in Tables 3 and 4.

80 parts by volume of ABS resin, 20 parts by volume of aluminum fiber
It is the same as Comparative Example 6 except that parts by volume were blended. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 3 and 4.

75 parts by volume of ABS resin, 25 parts by volume of aluminum fiber
It is the same as Comparative Example 6 except that parts by volume were blended. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 3 and 4.

Same as Example 12 except that 25 parts by weight of decabromobiphenyl oxide (DBBPO) was used instead of hexabromobenzene (HBB) and 4 parts by weight of antimony trioxide (SbzO:+). It is. The obtained test piece was subjected to electromagnetic shielding properties similar to those in Example 1.

It was subjected to flame retardancy and mechanical strength tests. The results are shown in Tables 3 and 4.

Example 12 except that 30 parts by weight of decabromo biphenyl oxide (D B B P O) was used in place of hexabromobenzene (HB B), and 5 parts by weight of antimony trioxide (sbzoi) was used. It is similar to The obtained test piece was subjected to electromagnetic shielding properties similar to those in Example 1.

It was subjected to flame retardancy and mechanical strength tests. The results are shown in Tables 3 and 4.

Same as Example 14 except that 25 parts by weight of decabromobiphenyl oxide (DBBPO) was used instead of hexabromobenzene (H'BB) and 4 parts by weight of antimony trioxide (SbJz). be. The obtained test piece was subjected to electromagnetic shielding properties similar to those in Example 1.

It was subjected to flame retardancy and mechanical strength tests. The results are shown in Tables 3 and 4.

Kitamoto [2 Instead of hexabromobenzene (HBB), 30 parts by weight of decabromo biphenyl oxide (DBBPO) was used,
The same as Example 14 except that antimony trioxide (SbzOi) was 5 parts by weight. The obtained test piece was subjected to electromagnetic shielding properties similar to those in Example 1.

It was subjected to flame retardancy and mechanical strength tests. The results are shown in Tables 3 and 4.

Comparative Example 13 Styrene-modified polyphenylene oxide (PPO) resin 8
0 parts by volume, 20 parts by volume of aluminum fibers were added instead of brass fibers, and decabromobiphenyl oxide (DBBPO) was added instead of hexabromobenzene (HBB).
This is the same as Example 12 except that . The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 3 and 4.

Comparative Example 13 is the same as Comparative Example 13, except that 25 parts by volume of aluminum fibers were added instead of brass fibers to 75 parts by volume of styrene-modified polyphenylene oxide (PPO) resin. The obtained test piece was subjected to the same tests as in Example 1 for electromagnetic shielding, flame retardancy, and mechanical strength. The results are shown in Tables 3 and 4.

As is clear from Tables 1 to 4, as shown in Examples 1 to 7, hexabromobenzene (HBB) and pentane were added as flame retardants to 100 parts by weight of an ABS resin composition containing 15 parts by volume of brass fibers. 12 parts by weight of aromatic bromine compounds with a molecular weight of 600 or less, such as bromotoluene (PBT), pentabromophenol (PBP) and tetrabromobisphenol A (TBA), and antimony trioxide (SbzOi) or oxidation as a flame retardant aid. By blending 2 to 3 parts by weight of zirconium (Z, 0°), excellent electromagnetic shielding properties with a 1 volume resistivity of 10 −2 Ω·G or less were obtained. Regarding flame retardancy, all U
The L-94 method showed a high flame retardant effect of V-O.

Furthermore, no decrease in mechanical strength was observed from the measured values of notched Izo impact strength. As shown in Examples 8 to 11, high flame retardancy, electromagnetic shielding properties, and mechanical strength were also obtained with similar compositions containing 7 parts by volume of copper fibers instead of brass fibers. As shown in Comparative Examples 1 to 5, when an aromatic bromine compound with a molecular weight of 600 or more, such as decabromo biphenyl oxide (DBBPO), is used as a flame retardant, 12 parts by weight, 25 parts by weight
When added in small amounts such as parts by weight (per 100 parts by weight of a styrenic resin composition containing brass fibers or copper fibers), U
The L-94 method only provides low flame retardant effects of HB and V-2, respectively. If DBBPO is added in a large amount, such as 30 parts by weight, the flame retardant performance will improve to the level of VO, but the electromagnetic shielding properties and mechanical strength will deteriorate. Furthermore, as shown in Comparative Examples 6 to 8, when aluminum fibers are added instead of brass fibers or copper fibers, a high flame retardant effect can be obtained even with the addition of a small amount of DBBPO, but electromagnetic shielding properties and mechanical strength are Missing.

As shown in Examples 12-15 and Comparative Examples 9-14.

When a similar experiment was conducted using a styrene-modified polyphenylene oxide (PPO) resin as the styrene resin, almost the same results were obtained as when ABS resin was used as the styrene resin.

(Margin below) Table 4 (Effect of the invention) The flame retardant resin composition for electromagnetic shielding of the present invention is as follows.

In this way, since it contains at least a thermoplastic resin containing a styrene resin, a copper fiber and/or a brass fiber, a halogen-containing organic compound, and an inorganic flame retardant aid, it has excellent performance in both tI flammability and electromagnetic shielding properties. ing. Moreover, the mechanical strength does not decrease. As a result, it is particularly useful as an electromagnetic shielding material for electronic equipment and automobile parts.

that's all

Claims (1)

[Scope of Claims] 1. A flame-retardant resin composition for electromagnetic shielding containing at least a thermoplastic resin containing a styrene resin, copper fibers and/or brass fibers, a halogen-containing organic compound, and an inorganic flame retardant aid. 2. The flame-retardant resin composition for electromagnetic shielding according to claim 1, wherein the halogen-containing organic compound is an aromatic bromine compound having a molecular weight of 600 or less. 3. The aromatic bromine compound is hexabromobenzene,
The flame-retardant resin composition for electromagnetic shielding according to claim 2, which is at least one of pentabromotoluene, pentabromophenol, and tetrabromobisphenol A. 4. The flame-retardant resin composition for electromagnetic shielding according to claim 1, wherein the inorganic flame-retardant aid is at least one of antimony trioxide, antimony pentoxide, and zirconium oxide. 5. The thermoplastic resin is at least one of polystyrene, high-impact polystyrene, ABS resin, styrene-butadiene copolymer, α-methylstyrene-modified polystyrene, α-methylstyrene-modified ABS resin, and styrene-modified polyphenylene oxide resin. A flame-retardant resin composition for electromagnetic shielding according to claim 1. 6. The flame-retardant resin composition for electromagnetic shielding according to claim 1, wherein the copper fiber and/or brass fiber is contained in an amount of 20 to 1000 parts by weight based on 100 parts by weight of the thermoplastic resin. thing. 7. The halogen-containing organic compound is the thermoplastic resin 1
The flame-retardant resin composition for electromagnetic shielding according to claim 1, wherein the flame-retardant resin composition is contained in a range of 2 to 50 parts by weight per 00 parts by weight. 8. The flame retardant resin for electromagnetic shielding according to claim 1, wherein the inorganic flame retardant aid is contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the halogen-containing organic compound. Composition.