JPS6114948A - Electromagnetic-wave shielding rubber material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides an antistatic fibrous material and a conductive powder material made of rubber or thermoplastic material such that the fibrous material accounts for at least 5 to 50% by volume. A thickness of 0.02 m to 1 in which fibrous substances are arranged in a certain direction by mixing into an elastic polymer material whose main component is rubber, latex, liquid rubber, etc.
．． After forming a 0 m antistatic sheet, it is formed into a laminate of two or more layers, a butt of two or more pieces, or a combination thereof so that the fibrous materials are arranged in different directions. The present invention relates to an electromagnetic wave shielding rubber material.

[Prior art]

2. Description of the Related Art In recent years, various electronic devices, communication receivers, computers, etc. have become widespread, and are now being used not only for business purposes but also for home use.

However, many electronic devices generate interfering electromagnetic waves that interfere with the functioning of other devices. In order to prevent such disturbances, it is necessary to shield the generated interfering electromagnetic waves from being radiated in all directions, and also to shield the interfering electromagnetic waves entering from the outside.

Conventionally, in order to solve these problems, for example, in the case of computers, metal plates were used for the exterior material or housing, or when polymer plastics were used, zinc spraying or conductive paint was applied. shields from interfering electromagnetic waves. As another method, a method has been developed in which electromagnetic waves are shielded by mixing a metal substance into the polymer plastic itself to make it conductive. Furthermore, areas where electromagnetic waves are particularly susceptible to leakage or ingress, such as penetrations or gaps in computer exterior materials, joints of cases of electronic components and switching regulators equipped with high-frequency power supplies, joints of waveguides, etc. For this purpose, conductive paint is applied, conductive caulking material or conductive adhesive is used, or metal solder is applied. However, all of these methods require time and effort to process, and the electromagnetic wave shielding effect is still not sufficient.

In addition, as another method to improve the above method, a method using conductive gaskets and gaskets, which requires less time and effort in processing, has been developed. These methods involve mixing a large amount of conductive powder, especially metal powder, into rubber or plastic.
The aim is to obtain an electromagnetic wave shielding effect by increasing the conductivity of the material.

However, on the other hand, these methods use a large amount of conductive powder, resulting in a product with a high specific gravity, high hardness, and poor elasticity, which is one of the drawbacks when used for packings and gaskets. Furthermore, when a large amount of metal powder is mixed, the metal powder may fall out of the matrix during transportation, installation, use, etc., making it difficult to obtain stable conductivity.

In order to improve the drawbacks caused by the use of large amounts of conductive materials, in recent years, materials with a short diameter of 1 m or more have been introduced as a substitute for metal powder.
Research using flat metal objects and metal fibers is underway. The advantage of these materials is that since the metal substances are flat or fibrous, they can exhibit high conductivity with a small amount compared to conductive powder.

However, there are problems when using these substances, and an immediate solution is desired. That is, the flat or fibrous shape makes mixing and dispersion difficult, there are problems with the adhesion to the matrix or the physical strength of the mixed molded product, and the cost is high.

[Summary of the invention]

The present invention was made in order to solve the above-mentioned drawbacks of the conventional art.
00 denier or less or diameter 0.2 mm or less length 0.1
Surface-treated fine metal wire of mm to 20 mm, metal plated Orio,
5 to 50 volume percent of antistatic fibrous material having self-discharge ability, that is, corona discharge ability, such as metal-deposited fiber, conductive metal compound, adsorption fiber, carbon composite synthetic fiber, etc., and 100 mesh or less of gold, silver, copper, or aluminum 10 to 40 parts by weight of a conductive powder material such as nickel, ferrite compound, graphite, conductive carbon black, etc. are mixed and dispersed therein, and the antistatic fibrous material is arranged in a certain direction, and has a thickness of 0.5 mm.
An antistatic sheet of 02 to 1.0 is formed into a laminate of two or more layers, a butt of two or more pieces, or a combination thereof so that the antistatic fibrous materials are arranged in different directions. The object of the present invention is to provide an electromagnetic wave shielding rubber material that can be molded to provide an excellent electromagnetic wave shielding effect.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on the drawings.

The present invention is an electromagnetic wave shielding rubber material having the shapes as illustrated in FIGS. 1 to 11, but it goes without saying that these examples can be used in any desired shape according to the limited intended use. be.

That is, FIG. 1 is a cutaway perspective view of an antistatic sheet (1) that constitutes a main part of the present invention. Here, the base material element of the antistatic sheet (1) is, for example, natural rubber and its latex, synthetic natural comb and its latex, styrene-butadiene rubber and its latex, chloroprene rubber and its latex, acrylonitrile-butadiene rubber and its latex, Inbutylene-isoprene rubber, ethylene-proprene rubber, chlorosulfonated polyethylene rubber, fluoro rubber, silicone rubber, polysulfide rubber elastic bodies such as l'm, liquid silicone rubber, liquid urethane rubber, liquid butadiene rubber, liquid imprene rubber, liquid chloroprene rubber,
Liquid rubber elastic bodies such as liquid polysulfide rubber, styrene-isoprene terminal block copolymer, styrene-butadiene terminal block copolymer, EPD
M polyolefin blend, ionomer, trans 1.4 polyimprene, 1.2 polybutadiene, chlorinated polyethylene, epichlorohydrin rubber, thermoplastic urethane elastomer, ethylene-vinyl acetate copolymer, polyethylene-butyl rubber graft polymer, elastic PVC, etc. The main component is one or more polymers of thermoplastic rubber that exhibits rubber elasticity at room temperature.

Next, the antistatic sheet (1) is made of a mixture containing the above-mentioned polymer as a main component, conductive metals such as gold, silver, steel, nickel, aluminum, or compounds thereof, such as cotton, cotton, cotton, rayon, Metal-deposited fibers, metal-plated fibers, conductive metal compound-impregnated or adsorbed fibers, which are vapor-deposited, plated, impregnated, or adsorbed on fibers such as acrylic, nylon, vinylon, polyester, polyethylene, and polypropylene;
Or fine pieces of carbon composite synthetic fiber mixed with conductive carbon, with a thickness of 500 denier or less and a length of 0.1 wm.
Carbon composite synthetic fibrous material with corona discharge capacity of ~20m or less than 0.2w in diameter and 0.1m to 20m in length
Antistatic fibrous material (2) consisting of fine metal wires etc. surface-treated by pickling, etc., 5 to 50% by volume, gold, silver with a volume resistivity of 1080.1 or less, 100 mesh or less , a metal powder such as copper, nickel, aluminum, or a ferrite compound, or a conductive powder (3) such as graphite or conductive carbon, is preferably blended in advance and added, and then dispersed almost uniformly. ,
The antistatic fibrous material (2) is prepared by calendering, casting, dipping, and coating into a film.
are arranged in a fixed direction in the form of a sheet with a thickness of 0.02 m+ to 1.0 m. The antistatic fibrous material (2) has a thickness of 500 deniers or less and a length of 0.1
Since it is a short fibrous surface-treated fiber with a diameter of 0.2 ass or less and a length of 0.1 m to 20 m for fine metal wires, it is easy to disperse into rubber, and at the same time it has good adhesion to rubber. It has excellent properties and is effective as a fibrous reinforcing agent, and does not impair the feel of the polymer.

Furthermore, the above-mentioned antistatic fibrous material (2) and conductive powder (
3), flame retardants such as antimony-based flame retardants represented by diantimony tritoxide, phosphorus esters and phosphorus compounds, chlorine-based flame release agents, bromine-based flame retardants, etc., are added at a total of 15 PHR ( In addition, an antistatic sheet (15 parts by weight per 100 parts by weight of polymer) or more
1) can also be made flame retardant. In addition, 15 PHR
This is because the total number of flame retardant additions required for imparting self-extinguishing properties is 15 PHR or more for the above-mentioned companies requiring addition. Moreover, the antistatic sheet (1) in the form of a sponge sheet can be prepared by adding the above-mentioned additives together with a necessary foaming agent.

Furthermore, especially from the aspect of reinforcing effect, blends containing the above-mentioned additives can be used for cotton, nylon, vinylon, polyester, cotton, rayon, polyethylene, polypropylene,
It is coated on a gray material such as acrylic by pressing, dipping, coating, frixioning, topping, etc. to form an antistatic sheet with a base fabric (1).
You can also

In addition, the gray fabric includes a part or all of the above-mentioned fibers plated, vapor-deposited, adsorbed or impregnated with conductive metals or these metal compounds, or carbon composite synthetic fibers mixed with conductive carbon. It can also be used to further enhance the conductivity and electromagnetic wave shielding effect.

In addition, the thickness of the antistatic sheet (11) in the present invention is 0.
A range of 0.02 - 1.0 - is most effective.

In other words, if the wall thickness is 1 m or more, the antistatic fibrous material (
2) is not uniformly dispersed on the surface and inside of the sheet, and there is less on the surface and more on the inside, so the fibrous material (2)
) array also looks bad. For this reason, in the case of a sheet with a wall thickness of 1 m or more, the amount of fibrous material (2) must be blended in a larger amount than necessary, which is not only uneconomical, but also the sheet (1) itself is thick and laminated. And/or there is a drawback that the thickness of the shielding rubber material (molded product) obtained by butting is limited to a large thickness.

In addition, if the thickness of the sheet (1) is less than 0.02 votes, there will be disadvantages such as difficulty in manufacturing the sheet, weakening of strength and easy tearing, and long-term effects regarding wear cannot be expected. . On the other hand, 0.02m~1.
When the thickness of the sheet (1) is 0 m, the non-uniform dispersion of the antistatic fibrous material (2) in the sheet layer that occurs due to the thinness of the sheet (1) disappears, and at the same time, the arrangement state of the fibrous material C] is reduced. Since the antistatic properties are extremely good, the addition of unnecessary antistatic fibrous material (2) can be avoided, and an antistatic sheet (1) that is inexpensive and stable in physical properties can be obtained.

In this case, the thickness of the fibrous substance (2) mixed is 50
Desirably less than 0 denier or less than 0.2 m in diameter,
The length is preferably in the range of 0.1 vm to 20+s+.

This is because if the thickness is 500 denier or more or the diameter is 0.2 or more, the dispersion in the rubber compound is poor, arrangement is difficult, and strength cannot be expected. Regarding the length, if the length is less than 0.1, the dispersion in the rubber is good, but the orientation effect of the fibrous material (2) is poor, and if it is 20 or more, the dispersion in the rubber is not possible and the fibrous material (2) There is a possibility that they will cluster together in the formulation and will not be arranged at all.

On the other hand, the antistatic fibrous substance (2) has a melon of 5 to 50% when whole 7)
A range of percentages is appropriate. If it is less than 5%, the volume resistivity of the molded product increases, resulting in poor conductivity and no electromagnetic wave shielding effect. On the other hand, if it is more than 50%, it is difficult to mix and disperse it into the rubber, and the hardness of the resulting molded product is so high that it is difficult to maintain strength and rubber elasticity.

Furthermore, in the present invention, gold, silver, copper, nickel,
A conductive powder (3) of particle size 100 mesh or less, such as aluminum, ferrite compound, graphite, conductive carbon black, etc., is preferably mixed with an antistatic fibrous material in advance.
It is blended with (2) and added to the rubber, but this is intended to secondarily help the probability of contact between the above fibrous substances (2) and increase conductivity. For example, the volume ratio of the fibrous material ff (2) in the rubber is 50%.
It is sufficient to use less than 50%, and as described above, it is possible to prevent the disadvantages that occur when 50% or more is mixed, such as poor mixing and dispersion, and the hardness of the obtained molded product is too high, making it impossible to obtain good elasticity. On the other hand, since the conductive powder (3) is also used for the purpose of increasing the probability of contact between the fibrous material (2), there is no need to use a large amount; Small amounts in the range of 40 parts by weight are preferred.

In addition, if the fibrous material (2) and the conductive powder (3) are blended in advance, the fibrous material (2) will be coated with the conductive powder (3), so the fibrous material Substance (2) is less likely to cause hair clumps.

As a result, the dispersion is extremely good and the fibrous material (2) is well arranged, so it has the effect of obtaining good conductivity even with the addition of a small amount of both materials, and has a relatively low specific gravity without impairing rubber elasticity. Light molded products can be obtained.

It should be noted that blending the fibrous material (2) and the conductive powder (3) can be done relatively easily using an ordinary blender machine.
It is necessary to blend the fibrous material and powder (3) until well mixed, and blending with some softening agent such as oil or plasticizer will give a good dispersion.

Each antistatic sheet (1
) is the antistatic property w1. The fiber materials (2) are laminated and/or butt-molded to a desired shape and thickness so that the directions of arrangement are different.

In order to enhance the electromagnetic wave shielding effect, the arrangement of the antistatic fibrous material (2) contained in the molded product is important.

That is, by arranging the VT fibrous material 2), the volume resistivity in the arranging direction decreases and the conductivity improves. Therefore, when the fibers 2) are arranged in the direction of electromagnetic wave entry, the shielding effect is the best. big.

Furthermore, experiments have shown that if there is no or a small number of fibers (2) arranged, a sufficient shielding effect cannot be obtained unless the thickness of the molded product is at least 4 w or more in the direction of propagation of electromagnetic waves. Admitted.

Therefore, if the fibers of a molded product are arranged in only one direction, electromagnetic waves in the same direction as the fiber arrangement can be shielded regardless of the thickness of the molded product, but when electromagnetic waves enter from multiple directions, the wall thickness is always It is necessary to keep it above 4m+IJ.

In other words, the most appropriate method for shielding electromagnetic waves is to use a molded product in which the fibrous materials (2) are arranged in the same direction with respect to the direction of ingress of electromagnetic waves. Therefore, if the direction of the incoming electromagnetic waves is always constant, the antistatic fibrous material (2) may be arranged in one direction. but,
Normally, electromagnetic waves do not always enter in the same direction.

Taking these points into consideration, the present invention has developed an antistatic sheet (2) in which fibrous substances (2) are arranged in the longitudinal direction, as shown in FIG.
1) is cut freely in the length direction, width direction, or diagonal direction, and the fibrous material (2) is laminated and/or butt-molded so that it is arranged in two or more directions, thereby controlling the directionality of the incoming electromagnetic waves. The aim is to effectively shield electromagnetic waves without any problems.

For example, in Figure 1, two antistatic sheets (1) cut into desired sizes are
) is an example of the electromagnetic wave shielding rubber material of the present invention, which is laminated so that one layer is arranged substantially perpendicular to the other layer.

Here, the effect of the multidirectional arrangement of the molded product is that in addition to the electromagnetic wave absorption effect due to the same directionality of the fibrous material (2) as described above with the electromagnetic waves entering in two directions, the effect of the multidirectional arrangement of the molded product is that the internally reflected entering electromagnetic waves are quickly caught in other layers. It has the effect of absorbing radiation and attenuating electromagnetic wave energy through repeated internal reflections.

Figure 3 shows the antistatic sheet (11
2 is the other side of the electromagnetic wave shielding rubber material of the present invention, which is laminated in three layers so that the antistatic fibrous substances (2) contained therein are arranged in different directions.

That is, in the case of FIG. 3, the arrangement directions of the fibrous substances (2) included in the first WI, the second layer, and the third 'f1 are respectively 0°+900 and 450 with respect to the X axis.

The effect of the electromagnetic wave shielding rubber material having the P fibrous materials (2) with 7-control properties arranged in these three directions is that
From the axis, for that m magnetic wave! Because the fibers are arranged at different angles in the 3rd layer, 2nd layer, and 1st layer, electromagnetic waves undergo complex reflection, internal reflection, or absorption by these fibrous substances (2), and the electromagnetic wave energy decreases. .

In addition, when electromagnetic waves enter in two axial directions, when the A1 side and the A1 side are pressed and clamped with metal clamping bodies, a part of the energy of the incoming electromagnetic waves is absorbed by the shielding rubber material and converted into thermal energy!
! Heat is quickly radiated from the first layer through the metal sandwich. Further, even if the surface of the shielding rubber material is charged as electrostatic energy by the incoming electromagnetic wave energy, it will be discharged through the metal sandwiching member. Furthermore, when the B1 side is compressed and held between metal holding bodies, heat is radiated and discharged from the second layer.

FIG. 4 is an example of the molded product obtained in FIG. 2 being punched out. In this case, emulsion, latex rubber solution,
A coating film (4) is formed on a part or all of the front and back surfaces of a molded product by spraying or dipping using liquid rubber or the like. The effect of coating the front and back surfaces and/or the sides is to eliminate the causes of dust caused by the fluffing of the fibrous material (2) and dirt caused by separation, and also to improve the texture.

Figure 5 (J Cut the antistatic sheet (1) in Figure 1 to a desired size in the length and width directions in the same way as the other examples, and then plate the sheets obtained). This is another example of a planar body having fibers arranged in different directions obtained by pasting and press molding.

As mentioned repeatedly, the most appropriate method when using fibrous material (2) as an effective means for shielding electromagnetic waves is to The method is to use molded products arranged in the same direction. However, in the research conducted by the present inventors, when the antistatic fibrous material (2) included in the electromagnetic wave area is arranged in the same direction as the electromagnetic wave enters, the fibrous material (2) included in the other area They discovered the surprising fact that even if they are in different directions, when they coexist, their electromagnetic wave shielding effect is almost the same as when they are all arranged in the same direction. This is an antistatic fibrous material (2
) and the conductive powder (3) coexisting at the same time, causing energy attenuation due to repeated complex reflections, and it is thought that heat is dissipated and discharged more quickly than the fibrous material (2) arranged in the same direction.

Although FIG. 5 illustrates a bonded molded product made by butting two sheets together, it is also possible to obtain a bonded molded product having fibers arranged in multiple directions by butting three or four sheets together. It is also possible to similarly provide a surface coating layer as shown in FIG.

FIGS. 6 and 7 show other examples of molded products pressed into cylindrical bodies. Note that the cylindrical molded product can also be cut into rings and used in desired sizes.

Of course, it is also possible to mold it into other desired shapes. Furthermore, for method 1 of cylindrical products, as shown in Figure 6, it is also good to vulcanize parts of the fibrous material (2) so that they overlap in different directions, It may also be made by stacking all of them together and pressing them as shown in Fig. 7.

Figure 8 shows an adhesive layer (5
) is an example of the present invention. That is, ordinary adhesives, adhesives, sealants, or conductive adhesives, adhesives,
A molded product coated with or bonded with a sealant, making it easier to attach it to other objects.

Note that (6) in the figure is release paper.

Figures 9 and 10 show electronic component cases (7) and (8).
) shows an example of the use of this electromagnetic shielding rubber material. Note that (9) is ground.

FIG. 11 shows an application example in which the electromagnetic wave shielding rubber material shown in FIG. 5 is used in a power plug (10). Needless to say, this example has the purpose of preventing noise generated when a plug is inserted into a power source, and has a good effect.

Regarding the laminating and/or butting method in the present invention, each sheet (1) may be cut and then only a portion thereof may be laminated and/or butted, or all of the sheets may be laminated and/or butted. Or you can meet up.

In the case of vulcanization molding, pre-vulcanized antistatic sheets may be bonded together with an adhesive, or may be bonded together while unvulcanized and then vulcanized. In addition, when using an unvulcanized sheet, the sponge sheet should be foamed at the same time as vulcanization.
A semi-vulcanized sponge sheet that has been foamed in advance is used.

As described above, the present invention is an electromagnetic wave shielding rubber material that has both high self-discharge ability (corona discharge ability) and good conductive performance.

That is, as a result of various experiments, the present inventors found that by combining an antistatic sheet with self-discharge ability and a conductive sheet with a conductive effect into one composition, it was possible to In comparison, the laminated sheet of the present invention has several times the electromagnetic wave shielding effect, and furthermore, the self-discharge ability of the laminated sheet of the present invention is several times higher than that of thin metal wires, metal-plated fibrous materials, metal-deposited fibrous materials, and carbon composite synthetic fibrous materials. The present invention was achieved by discovering that by directly adding a conductive substance such as conductive carbon to the mixed and dispersed antistatic sheet, the self-discharge capacity (corona discharge capacity) of these sheets could be synergistically enhanced.

Experimental Example (1) Table 1 The formulations shown in Table 1 above were mixed using a mixing roll, and an antistatic sheet (sheet thickness 0.5 wx) in which fibrous substances were arranged in the longitudinal direction was obtained using a calendarer. . The antistatic fibrous material used had a thickness of 50 denier and a length of 3 m. Next, the antistatic sheet thus obtained was placed in a third
As shown in the figure, Qo
.

When heat molding was performed by overlapping press molding to obtain a value of 900.450, the characteristic values were as shown in Table 2.

Table-2 Moreover, the shielding effect was as shown in FIG.

The electromagnetic wave shielding effect was measured as follows (frequency band 100 to 1000 KHz).The electromagnetic wave measurement was performed using a spectrum analyzer TR4172 (manufactured by Takeda Riken), and the shielding effect was calculated using the following formula.

As shown in the above results, the molded product according to the present invention had an extremely good electromagnetic wave shielding effect and good rubber elasticity and physical properties.

Experimental Example (2) Table 3 The formulations shown in Table 3 above were mixed using a mixing roll and then sheeted using a calendar to obtain an antistatic sheet (thickness: 2.1 wm) as shown in Figure 1.

This sheet was butt-molded and press-vulcanized as shown in FIG. (Press condition: 130°C x 30 minutes 4.2
Ky/cd) Also, the antistatic property used lol! , the fiber is 30 denier in thickness and 3 in length.
It was m. The molded product thus obtained was a thin rubber plate in which the antistatic fibrous material oriented in the vertical direction and the horizontal direction was arranged on a plane approximately in half.

Experimental example (1)
), the results were as shown in Table 4.

Table 4 As seen in the results in Table 4, the electromagnetic shielding rubber material obtained in Experimental Example (2) had good rubber elasticity and physical properties, and an excellent electromagnetic shielding effect.

〔Effect of the invention〕

As described above, the electromagnetic wave shielding rubber material of the present invention has an electromagnetic wave shielding effect in a general-purpose frequency band, so it can be used as a noise filter for wave guides, flange gaskets, electronic equipment box sealers and gaskets, power plugs, sockets, etc. It can be used in a wide range of applications to prevent electromagnetic interference (xy engineering) and radio frequency interference (R?I). Furthermore, depending on the frequency characteristics, it can be fully utilized as a magnetic shielding material and a radio wave absorber. Furthermore, the present invention is characterized by exhibiting a shielding effect against electromagnetic waves entering from multiple directions.

Furthermore, in the present invention, since the antistatic fibrous material and the conductive powder are used together, the fibrous material is oriented smoothly without causing fiber clumps or poor dispersion.
Because the powder increases the probability of contact between the fibers, the amount of conductive material is small (and has a good shielding effect).
It is possible to obtain an epoch-making electromagnetic shielding rubber material that has a lower specific gravity and greater elasticity than conventional gaskets used in this type of application, and is sufficiently effective as a normal gasket.

Furthermore, the present invention allows the surface to be coated, and as a result, the fibrous material does not separate from the molded product, and stable quality can be obtained without causing lumps or dust.

Furthermore, by providing an adhesive or an adhesive layer on the front and back surfaces, it also has the advantage that it can be easily attached to other objects.

Furthermore, the present invention can be used not only for wave guides, flange gaskets, plugs, electronic equipment boxes, etc., but also for various products to prevent electromagnetic waves.In addition, in terms of manufacturing costs, there is no need to use special equipment or machinery. It has many advantages, such as being inexpensive.

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of the antistatic sheet according to the present invention, and FIG.
3 is a partially cutaway perspective view of a laminated electromagnetic shielding rubber material of the present invention, FIG. 4 is a partially cutaway perspective view of a surface-coated electromagnetic shielding rubber material of the present invention, and FIG. 5 is a plan view. Fig. 6 is a perspective view of the electromagnetic wave shielding rubber material of the present invention obtained by butt molding in which fibrous substances are arranged in two directions. FIG. 7 is a partially cutaway perspective view of the fully laminated cylindrical electromagnetic shielding rubber material of the present invention obtained by molding, and FIG. 8 is a partially cutaway perspective view of the thin plate-like molded product of FIG. A perspective view of the electromagnetic shielding rubber material of the present invention coated with an adhesive, Figures 9 and 10 are diagrams showing application examples of the electromagnetic shielding rubber material of the present invention used in cases of electronic components, respectively, and Figure lx1 is a power plug. FIG. 12 is a diagram showing an example of the use of the electromagnetic wave shielding rubber material of the present invention used in the present invention, and FIG. 12 is a diagram showing the shielding effect. In the figure, (1) is an antistatic sheet, (2) is an antistatic fibrous material, (3) is a conductive powder, (4) is a coating film, (
5) is an adhesive layer.

Claims (7)

[Claims] (1) A thickness of 50 mm in elastic polymer material whose main component is rubber, thermoplastic rubber, liquid rubber, or latex.
0 denier or less or diameter 0.2 mm or less, length 0.1
Surface-treated fine metal wire of mm to 20 mm, metal plated fiber,
5 to 50 volume percent of an antistatic fibrous material having self-discharge ability, that is, corona discharge ability, such as metal-deposited fiber, conductive metal compound adsorption fiber, carbon composite synthetic fiber, etc., and 10 to 40 weight percent of a conductive powder material of 100 mesh or less. An antistatic sheet with a thickness of 0.02 mm to 1.0 mm in which the antistatic fibrous material is mixed and dispersed and arranged in a certain direction, respectively, An electromagnetic wave shielding rubber material characterized in that it is formed into a laminate of two or more layers, a butted body of two or more pieces, or a combination thereof. (2) The electromagnetic wave shielding rubber material according to claim 1, wherein the antistatic sheet is a flame retardant antistatic sheet containing 15 PHR or more of a flame retardant. (3) The electromagnetic wave shielding rubber material according to claim 1, wherein the antistatic sheet is a sponge-like antistatic sheet. (4) Pressing, dipping, coating, frixioning, or topping the antistatic sheet composition onto a fabric made of natural or synthetic fibers (gray fabric), preferably a fabric in which an antistatic fibrous substance is used as a part of the fabric. The electromagnetic wave shielding rubber material according to any one of claims 1 to 3, which is made into an antistatic coated fabric sheet. (5) The electromagnetic wave shielding rubber material according to any one of claims 1 to 4, wherein a latex or liquid rubber layer is provided on the front and back layers and/or the side surfaces. (6) The electromagnetic wave shielding rubber material according to any one of claims 1 to 5, wherein a pressure-sensitive adhesive layer or an adhesive layer is provided on a part or all of the front and back layers. (7) The electromagnetic wave shielding rubber material according to any one of claims 1 to 6, which is molded into a cylindrical body.