JP4572678B2 - Rubber composition for outer hood and outer hood for railway vehicle - Google Patents

Description

  The present invention relates to a rubber composition having both wear resistance and flame retardancy. In particular, the present invention relates to a rubber composition for an outer hood of a railway vehicle that has both wear resistance and flame retardancy.

  Conventionally, a vehicle hood that covers a space between a vehicle of a high-speed rail and a vehicle (vehicle connection portion) covers only an inner hood that covers the entire periphery of the entrance / exit of the vehicle end and only the left and right side surfaces of the vehicle outside the vehicle. It consists of an outer hood.

An inner hood provided in the vehicle connecting portion is formed in a bellows structure and plays a role of protecting the interior of the vehicle from wind and snow, dust and the like.
On the other hand, the outer hood is made of a rubber plate having a U-shaped cross section, and is attached to the side surfaces of the front and rear vehicles. The outer hood improves the aesthetics of the vehicle connection part and plays a role in preventing passengers from falling from the platform of the station to the track from the space between the vehicles.
However, conventional vehicle hoods have been considered to be sealed to prevent intrusion of wind and snow, dust, and the like, but sufficient measures against noise have not been taken.

  In recent years, railway vehicles, especially the Shinkansen, tend to run at higher speeds, including wind noise (including air entanglement in the vehicle connection), friction noise between wheels (flange) and rail, and unevenly worn wheel rails. Noises such as knocking noise, wheel rolling noise, pantograph rubbing noise, vehicle device operation noise, wheel knocking noise at rail joints, etc., go out of the vehicle through the gaps in the vehicle joints, floor, glass Propagates through the vehicle body components such as windows and inner hoods.

  In order to temporarily prevent such diffusion of the sound outside the vehicle, a method of covering the vehicle connecting portion with a hood and sealing the vehicles with a flexible component such as rubber can be cited as an example. In this case, the effect of preventing the sound from spreading outside the vehicle can be expected, but the following new problems arise.

  The vehicle travels all on the tracks in the yard, parking lot, and business route, but especially on a rail with a large curvature when the vehicle is pulled out from the yard. At this time, a compression / extension load due to a difference in curvature between the outer wall side of the hood and the inner wall side of the hood is applied to the shoulder portion of the hood on the inner periphery side of the rail that covers the vehicle connection portion. For example, if the curvature radius on the outer wall side of the hood is 400 mm and the curvature radius on the inner wall side of the hood is 260 mm, the difference between the curvature radii is 140 mm, and the deformation moves between the outer wall side of the hood and the inner wall side of the hood. It becomes difficult. Therefore, the facing outer hoods always rub against each other at the same part. Each time the vehicle runs on a rail with a large curvature, the outer hoods rub against each other at the same part on the inner circumference side of the rail, so they wear out and the surface is scraped. The problem arises. In particular, since the shoulder portion of the outer hood is sandwiched between the side surface portion and the ceiling portion, free deformation becomes more difficult, and such a problem is likely to occur.

  The above problem will be described in detail with reference to the accompanying drawings. FIG. 2 is a diagram of the outer hood of the railway vehicle according to the present invention, which will be described later, but here it is diverted to a diagram showing the outer hood of a conventional railway vehicle. 2 to 5, 1 denotes a vehicle, 3 denotes a straight member of the outer hood, and 4 denotes a shoulder member of the outer hood.

FIG. 2 is a schematic cross-sectional view of a side surface portion of an outer hood of a railway vehicle when the vehicle travels on a straight rail or a rail having a small curvature. In this case, the linear member of the outer hood is not particularly deformed or rubbed, and there is no problem of wear.
FIG. 3 is a schematic cross-sectional view of the side surface portion on the outer peripheral side of the rail of the outer hood of the railway vehicle when the vehicle travels on a rail with a large curvature. In this case, the linear members of the outer hood do not contact each other, and there is no problem of wear.

FIG. 4 is a schematic cross-sectional view of the side surface portion on the inner peripheral side of the rail of the outer hood of the railway vehicle when the vehicle travels on a rail with a large curvature. In this case, the linear members of the outer hood attached to the front and rear vehicles can be relatively freely deformed while being in contact with each other, but may be worn and eventually damaged.
FIG. 5 is a schematic cross-sectional view of the shoulder portion on the inner peripheral side of the rail of the outer hood of a railway vehicle when the vehicle travels on a rail with a large curvature. In this case, since the shoulder member of the outer hood attached to the front and rear vehicles is formed in a curved shape in accordance with the shoulder of the vehicle (see FIG. 1 described later), the free deformation becomes more difficult. Problems are likely to occur.

  Patent Document 1 describes an outer hood that aims to solve such a problem and has a feature in its structure.

On the other hand, materials used for vehicles (for example, rubber compositions and the like) are basically required to be flame retardant from the viewpoint of safety and the like. In order to improve the flame retardancy of materials, various flame retardants are generally used.
However, these flame retardants often have the property of improving the flame retardancy and the property of reducing the wear resistance, and as a rubber composition containing the flame retardant, the flame resistance required for the outer hood is required. It was difficult to achieve both wear and flame retardancy at a high level.

JP-A-9-286329

  An object of the present invention is to provide a rubber composition that achieves high levels of both wear resistance and flame retardancy, and an outer hood for a railway vehicle using the rubber composition as a material.

As a result of intensive studies on the wear resistance and flame retardancy of the rubber composition, the present inventor has included a specific flame retardant in a specific ratio in a rubber having a diene structure, such as natural rubber, to thereby improve the wear resistance. And flame retardancy can be achieved at a high level.
Further, the present inventor has sufficiently satisfied the required wear resistance of the rubber composition as a rubber composition for an outer hood of a railway vehicle, particularly as a rubber composition for a shoulder member of an all-around outer hood. I found out that I can do it.
The present inventor completed the present invention based on the above findings.

That is, the present invention provides the following (I) to ( III ).

(I) Rubber component 100 mass% containing 30-100 mass% of natural rubber and 0-70 mass% of 1 or more types of rubbers selected from the group consisting of styrene-butadiene rubber, butadiene rubber and ethylene-propylene-diene rubber And
  The following component (1) or (2)
A rubber composition for an outer hood of a railway vehicle, comprising:
  (1) 30 to 85 parts by mass of aluminum hydroxide, 20 to 50 parts by mass of decabromodiphenyl ether and 10 to 20 parts by mass of ammonium polyphosphate
  (2) 30 to 90 parts by mass of aluminum hydroxide, 10 to 50 parts by mass of chlorinated paraffin and 3 to 20 parts by mass of antimony trioxide

(II) 100 mass parts of rubber component containing 30-100 mass% of natural rubber and 0-70 mass% of one or more rubbers selected from the group consisting of styrene-butadiene rubber, butadiene rubber and ethylene-propylene-diene rubber And
  The following component (1) or (2)
A rubber composition for an outer hood shoulder member of a railway vehicle, comprising:
  (1) 30 to 85 parts by mass of aluminum hydroxide, 20 to 50 parts by mass of decabromodiphenyl ether and 10 to 20 parts by mass of ammonium polyphosphate
  (2) 30 to 90 parts by mass of aluminum hydroxide, 10 to 50 parts by mass of chlorinated paraffin and 3 to 20 parts by mass of antimony trioxide

( III ) An outer hood for a railway vehicle using the rubber composition described in ( I ) or ( II ) as a material.

The rubber composition of the present invention has both high wear resistance and flame retardancy at a high level.
Since the rubber composition of the present invention has the above properties, it is suitably used for various applications. Among these, it is suitable for an outer hood of a railway vehicle, and particularly suitable for an entire outer hood (shoulder member) of a railway vehicle.

The present invention is described in detail below.
[Rubber composition]
First, the rubber composition of the present invention will be described.
The rubber composition of the present invention contains 30 to 100% by mass of natural rubber and 0 to 70% by mass of one or more rubbers selected from the group consisting of styrene-butadiene rubber, butadiene rubber and ethylene-propylene-diene rubber. It is a rubber composition containing 100 parts by mass of the rubber component and the following component (1) or (2).

(1) 30 to 85 parts by mass of aluminum hydroxide, 20 to 50 parts by mass of decabromodiphenyl ether and 10 to 20 parts by mass of ammonium polyphosphate (2) 30 to 90 parts by mass of aluminum hydroxide, 10 to 50 parts by mass of chlorinated paraffin and 3-20 parts by mass of antimony trioxide

  Natural rubber (NR) is a polymer having a structure in which cis-1,4-polyisoprene is bonded to the head and tail. Generally used NR can be used as the NR used in the present invention.

  Styrene-butadiene rubber (SBR), butadiene rubber (BR) and ethylene-propylene-diene rubber (EPDM) that are generally used can also be used.

The rubber component used in the present invention is a component containing one or more rubbers selected from the group consisting of NR or NR and SBR, BR and EPDM.
The rubber component can be used in any combination of NR and SBR, BR, EPDM, but in terms of excellent wear resistance, it is a one-component rubber consisting only of NR; a two-component rubber consisting of NR and SBR; NR and BR Two-component rubbers of NR, SBR and BR; four-component rubbers of NR, SBR, BR and EPDM are preferred.

The ratio of each rubber in the two or more rubber components is not particularly limited, and can be appropriately determined in consideration of the balance with the wear resistance, flame retardancy and the like required for the rubber composition.
Specifically, the following mass ratios are preferable in that both the abrasion resistance and the flame resistance required for the rubber composition are excellent.

  That is, in the case of a two-component rubber of NR and SBR and a two-component rubber of NR and BR, it is preferable that NR is 50 to 80% by mass and SBR or BR is 50 to 20% by mass. More preferably, the NR is 60 to 80% by mass, and the SBR or BR is 40 to 20% by mass.

  In the case of a three-component rubber of NR, SBR and BR, it is preferable that NR is 35 to 65% by mass, SBR is 15 to 35% by mass, and BR is 20 to 40% by mass. More preferably, NR is 40 to 60% by mass, SBR is 20 to 30% by mass, and BR is 15 to 35% by mass.

  In the case of a four-component rubber of NR, SBR, BR and EPDM, NR is 20 to 40% by mass, SBR is 10 to 30% by mass, BR is 15 to 35% by mass, and EPDM is 20 to 40% by mass. Preferably there is. More preferably, NR is 25 to 35% by mass, SBR is 15 to 25% by mass, BR is 20 to 30% by mass, and EPDM is 25 to 35% by mass.

In the rubber composition of the present invention, rubbers other than the above essential components can be used as the rubber component as long as the object of the present invention is not impaired.
The rubber other than the essential components is not particularly limited. For example, isoprene rubber (IR), chloroprene rubber (CR), butyl rubber (IIR), acrylonitrile-butadiene rubber (NBR), ethylene-propylene rubber (EPM), silicone rubber , Urethane rubber, polysulfide rubber, and acrylic rubber.

In the rubber composition of the present invention, the following (1) or (2) is used as a flame retardant.
(1) Aluminum hydroxide, decabromodiphenyl ether and ammonium polyphosphate (2) Aluminum hydroxide, chlorinated paraffin and antimony trioxide

Generally as a flame retardant used for a rubber composition, a phosphorus flame retardant, a halogen flame retardant, an inorganic compound flame retardant, etc. are mentioned.
The present inventor combines the three components shown in the above (1) or (2) among the flame retardants used in the rubber composition, and when the rubber component described above is contained at a specific ratio, Knowing that both the wear resistance and flame retardancy are excellent, the present invention has been completed.

  As each flame retardant described in the above (1) and (2), generally known flame retardants can be used.

The content of each flame retardant in the combination of flame retardants described in (1) above is as follows.
That is, aluminum hydroxide is 30 to 85 parts by mass, preferably 40 to 80 parts by mass, and more preferably 50 to 75 parts by mass with respect to 100 parts by mass of the rubber component.
Moreover, decabromodiphenyl ether is 20-50 mass parts with respect to 100 mass parts of said rubber components, Preferably it is 30-50 mass parts, More preferably, it is 35-50 mass parts.
In addition, the ammonium polyphosphate is 10 to 20 parts by mass, preferably 12 to 20 parts by mass, and more preferably 14 to 20 parts by mass with respect to 100 parts by mass of the rubber component.

The content of each flame retardant in the combination of flame retardants described in (2) above is as follows.
That is, aluminum hydroxide is 30 to 90 parts by mass, preferably 30 to 80 parts by mass, and more preferably 30 to 60 parts by mass with respect to 100 parts by mass of the rubber component.
A chlorinated paraffin is 10-50 mass parts with respect to 100 mass parts of said rubber components, Preferably it is 20-40 mass parts, More preferably, it is 25-30 mass parts.
Antimony trioxide is 3 to 20 parts by mass, preferably 4 to 15 parts by mass, and more preferably 5 to 10 parts by mass with respect to 100 parts by mass of the rubber component.

The rubber composition of the present invention can contain various additives as necessary in addition to the rubber component and the flame retardant as long as the object of the present invention is not impaired.
Examples of additives include reinforcing agents (fillers), anti-aging agents, antioxidants, pigments, dyes, plasticizers, thixotropic agents, ultraviolet absorbers, solvents, and surfactants (including leveling agents). , Dispersant, dehydrating agent, rust preventive agent, adhesion imparting agent, antistatic agent, thixotropy imparting agent.
As these additives, those usually used in rubber compositions can be used in a usual content. Moreover, it can change suitably according to the objective, a use, a required characteristic, etc.

In addition, the rubber composition of the present invention can contain a vulcanizing agent, a vulcanization aid, a vulcanization accelerator, a vulcanization retarder, and the like as long as the object of the present invention is not impaired.
As these vulcanizing agents and the like, those usually used in rubber compositions can be used in usual contents. Moreover, it can change suitably according to the objective, a use, a required characteristic, etc.
For example, the content of the vulcanizing agent is preferably 0.1 to 20 parts by mass, and more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the rubber component.

The method for producing the rubber composition of the present invention is not particularly limited. For example, the rubber component, the flame retardant, and various additives as necessary are uniformly mixed by a roll, a kneader, an extruder, a universal agitator, or the like. Can be manufactured.
The rubber composition thus obtained can be vulcanized by mixing a vulcanizing agent and the like, heating to a desired temperature, stirring and mixing.

Since the rubber composition of the present invention contains the rubber component and the flame retardant, it is possible to achieve both wear resistance and flame retardancy at a high level.
The rubber composition of the present invention can be used in various applications in which the rubber composition is used, but is preferably used in various applications that require these characteristics. Among these, it is preferably used for an outer hood of a railway vehicle, and particularly preferably used for an entire outer hood (shoulder member) of a railway vehicle.

[Railway outer hood]
Next, the outer hood of the railway vehicle of the present invention (hereinafter simply referred to as “the outer hood of the present invention”) will be described.
The outer hood of the present invention is an outer hood of a railway vehicle using the rubber composition of the present invention as a material.
The configuration of the outer hood of the present invention is not particularly limited. For example, the outer hood is an annular outer hood that covers the entire circumference of the space between the vehicles at the connecting portion of the front and rear vehicles, and includes a rear end portion of the front vehicle and a rear vehicle. One of the preferred embodiments is an outer hood made of a flexible membrane body having a substantially U-shaped cross section (V-shaped or the like) attached to face the front end of each.
Here, the circular outer hood covers the upper, lower, left and right linear members (the left and right side surfaces, the ceiling and the floor) covering the entire circumference of the space between the vehicles, and the shoulders disposed at the four corners connected thereto. It is preferable that the flexible film body has a thick flange portion at a portion where the flexible film body is attached to the vehicle, and a thin-walled U-shaped (V-shaped or the like) film body portion at a portion facing the front and rear vehicles. Preferably, the reinforcing layer is embedded in the flexible membrane.

  As described above, high wear resistance is particularly required for the shoulder (shoulder member) of the outer hood. Therefore, the rubber composition of the present invention may be used for the entire outer hood, but if it is used for at least the shoulder portion (shoulder member), the characteristics of the rubber composition of the present invention can be effectively utilized. Excellent performance as a hood.

  Hereinafter, an outer hood of the present invention will be described with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a schematic partial perspective view for explaining an embodiment in which the outer hood of the present invention is attached to a vehicle.
As shown in FIG. 1, an annular outer hood 2 that covers the entire circumference of a space portion between vehicles in a connecting portion of a vehicle 1 is composed of four linear members 3 in the vertical and horizontal directions (left and right side portions, a ceiling portion, and a floor portion). And four shoulder members 4 connecting the four linear members 3 at the four corners. In the figure, reference numeral 5 denotes a passage in the vehicle 1.

2 is a cross-sectional view taken along the line AA in FIG.
As shown in FIG. 2, the linear member 3 of the outer hood 2 includes a flexible film body 6 having a substantially U-shaped cross section. The linear member 3 may be used by coating the rubber composition of the present invention on a woven fabric made of nylon, aramid, PET, or the like as a reinforcing layer in order to increase rigidity and resilience, if necessary. it can.

In FIG. 2, the outer shape of the vehicle connected to the vehicle and the outer hood attached thereto are shown by dotted lines in order to show the relative positional relationship between the front and rear vehicles. That is, the outer hood 2 of the present invention is configured by a flexible film body 6 having a substantially U-shaped cross section that is attached to face the rear end portion of the front vehicle 1 and the front end portion of the rear vehicle 1. .
Here, the outer hood of the present invention preferably has a substantially U-shaped cross section. Specifically, in addition to the U shape, the shape may be a substantially V shape, a substantially semicircular shape, or the like. These shapes can be changed according to the shape of the vehicle used. For example, even if it is substantially V-shaped, it can be non-equal, not equi-lateral.

FIG. 6 is a schematic partial perspective view for explaining another shape of the flexible film body 6 constituting the linear member 3 of the outer hood 2.
As shown in FIG. 6, the flexible film body 6 is thin at the center 7 in the width direction and gradually increases in thickness toward both ends, and is attached to the vehicle 1 at both ends. A portion 8 is formed. As shown in FIG. 2, the flexible film body 6 includes a thick flange portion 8 at a site where the vehicle 1 is attached and a thin cross-section substantially U-shaped (V-shaped, etc.) at a site facing the front and rear vehicles 1. ).

  FIG. 6 shows the case where the flange portions 8 formed at both ends of the flexible film body 6 have a shape protruding in opposite directions. This is the case where the flexible film body 6 is attached to the vehicle. Therefore, there is no problem even if the protruding directions of the flanges 8 formed at both ends of the flexible film body 6 are the same direction.

  FIG. 7 is an explanatory diagram for explaining a method for attaching the flexible membrane body constituting the straight portion of the outer hood, and FIG. 8 is an explanatory diagram for explaining a method for attaching the annular outer hood. .

  As shown in FIG. 7, the flexible film body 6 is attached by attaching one flange portion 8 to the outer peripheral side of the upper, lower, left and right linear portions of the vehicle 1 so that the end portion is directed toward the inside of the vehicle 1. Thereafter, the other end side is bent in the direction indicated by arrow C in the figure, and the flexible film body 6 is bent so that the cross section of the flexible film body 6 is substantially U-shaped. The attachment of the linear member 3 of the outer hood 2 is completed after attaching to the circumferential side.

  Further, as shown in FIG. 8, a plurality of shoulder members 4 each having a desired curvature and having a substantially U-shaped cross section and having a flange portion having an L-shaped cross section inward in the width direction end portion are provided. Installation of the outer hood 2 of the present invention is completed by forming the shoulder member 4 separately from the straight member 3 and attaching it to the vehicle 1 with the longitudinal end of the shoulder member 4 overlapped with the end of the straight member 3. To do.

  Although the outer hood of the present invention has been specifically described with reference to one embodiment, the outer hood of the present invention is not limited to this. For example, a through hole 9 (see FIG. 8) is formed on the wall surface of the shoulder member 4 of the outer hood to improve workability for fixing the outer hood to the vehicle body and release concentrated stress. Alternatively, a notch or the like may be formed in the shoulder member 4.

Hereinafter, the present invention will be described specifically by way of examples. However, the present invention is not limited to this.
1. Preparation of rubber compositions (Examples 1-7 and Comparative Examples 1-4)
Various rubbers, flame retardants and additives (excluding sulfur and vulcanization accelerator) are added to a 20 L kneader mixer in the blending amounts (parts by mass) shown in Tables 1 and 2 and mixed for about 15 minutes. It was. Thereafter, the obtained rubber mixture was wound around an 18-inch kneading roll, sulfur and a vulcanization accelerator were added, and kneaded for about 10 minutes to obtain a rubber composition.

2. Production of outer hood for railway vehicle A real 1/2 scale simple molding mold was produced for the wear resistance test of the outer hood. Using this simple mold, each rubber composition obtained above was can vulcanized at 150 ° C. for 45 minutes to obtain a shoulder member of the outer hood.
FIG. 9 is a schematic perspective view of the shoulder member of the outer hood obtained.
As shown in FIG. 9, a shoulder member 4 having a substantially V-shaped cross section was obtained. The height of the obtained shoulder member 4 is 125 to 130 mm, the length of the outer surface 10 of the hood is 700 mm, the radius of curvature (R) on the outer surface side of the curved portion 11 is 200 mm, and the width of the hood (distance between the flanges 8). Was 70 mm and the V-shaped cross section was equilateral.
The shoulder member 4 shown in FIG. 9 and the symmetrical shoulder member 4 'were also obtained in the same manner.

3. Abrasion resistance test The shoulder member obtained above was attached to a load displacement characteristic tester (manufactured by Yokohama Rubber Co., Ltd.), and an abrasion resistance test was conducted by the following method to evaluate the abrasion resistance. The reason why the wear resistance test was performed on the shoulder member is that wear resistance is particularly required.

<Test method>
FIG. 10 is an explanatory diagram of a method of an abrasion resistance test. 10A is a plan view, and FIG. 10B is a cross-sectional view taken along the line DD in FIG. 10A.
As shown in FIG. 10, the shoulder members 4 and 4 'thus obtained are mounted on the mounting surface composed of the upper surface 20 and the lower surface 20' facing each other of the load displacement characteristic testing machine, and the upper surface 20 and the lower surface 20 'are mounted. Was adjusted to 150 mm.
Next, the upper surface 20 is fixed, the lower surface 20 ′ is displaced by 185 mm left and right around the shoulder member 4 of the fixed upper surface 20, and the side walls of the shoulder members 4 and 4 ′ are repeatedly rubbed (laterally). Rubbing test). That is, the operation of moving the shoulder member 4 'to the position 4 "and then returning it to the position 4' was repeated.
The number of displacements (lateral rubbing) was 9000 times one way (4500 round trips). In addition, the number of side slips of 9000 times one way is the number of side rubbing times corresponding to about 6 years when actually attached to the vehicle.

The evaluation was performed by visual inspection and palpation by stopping the test machine every 1500 times of one-way skids and widening the space between the mounting surfaces of the test machine. When there was no change, the distance between the upper surface 20 and the lower surface 20 'of the testing machine was adjusted to 150 mm again, and the test was continued.
The results are shown in Tables 1 and 2. In the curved part of the shoulder member after reaching the number of side slips of 9000 times one way, the case where the hole due to wear is not opened is defined as “good”, the case where the hole is opened is defined as “hole opened”, and the hole is opened. The case of starting (when a small hole was opened) was designated as “beginning of opening”, and the case of opening a hole before reaching the number of side slips of 9000 one way was designated as “hole opening (number of times)”.
In addition, in the case where the hole was not opened with the number of side slips of 9000 times one way, the hole was not opened in the severe test in which the number of sideslips was 27000 times one way.

4). Flame retardancy test The flame retardancy test for the shoulder member obtained above was performed in accordance with JIS K7201-1: 1999 and JIS K7201-2: 1999 "Plastics-Test method for flammability by oxygen index-". went.
As the test piece, the rubber composition obtained above was vulcanized at 150 ° C. for 45 minutes.
When the oxygen index was determined, the burning lengths of the test pieces were 38 mm and 55 mm, and the burning times were 155 seconds and 187 seconds.
The flame retardant test was conducted 5 times, and the average value of the oxygen index was evaluated.
The results are shown in Tables 1 and 2. In addition, although it can be said that it is generally flame-retardant if an oxygen index exceeds 21, in recent years, in view of higher safety, 25 or more tends to be required.

The components shown in Table 1 and Table 2 are as follows.
-NR: STR20, manufactured by TECK BEEHANG-SBR: NIPOL1500, manufactured by Nippon Zeon-BR: NIPOL BR1220, manufactured by Nippon Zeon-EDPM: ESPRENE305, manufactured by Sumitomo Chemical Co., Ltd.-Aluminum hydroxide: Hijilite H-42M, Showa Manufactured by Light Metal Co., Ltd. ・ Decabrom diphenyl ether: Pyroguard SP-270, manufactured by Daiichi Kogyo Seiyaku Co., Ltd. ・ Ammonium polyphosphate: Sumisafe P, manufactured by Sumitomo Chemical Co., Ltd. ・ Chlorinated paraffin: Toyoparax A70, manufactured by Tosoh Corporation S, manufactured by Nippon Seiko Co., Ltd. ・ Carbon black: HAF grade, Dia Black HA, manufactured by Mitsubishi Chemical Co., Ltd. ・ Zinc oxide: Ginseng R, manufactured by Toho Zinc Co., Ltd. ・ Stearic acid: LUNAC YA, manufactured by Kao Corporation ・ Wax 1: Paraffin wax OZOACE-0 37, manufactured by Nippon Seiwa Co., Ltd. ・ Wax 2: Sunnock, manufactured by Ouchi Shinsei Chemical Co., Ltd. ・ Aroma process oil: AROMATIC OIL, manufactured by Shell Chemical Co., Ltd. ・ White carbon: Carplex 1120, manufactured by Shionogi & Co., Ltd. Made by Nippon Talc Co., Ltd. Titanium oxide: R-820, made by Ishihara Sangyo Co., Ltd. Paraffin oil: Machine oil, made by Showa Shell Sekiyu Co., Ltd. Dicumyl peroxide mixture: DI-CUP40C, HERCULES POWDER CO.・ Sulfur: Powdered sulfur, manufactured by Karuizawa Refinery ・ Vulcanization accelerator: Cyclohexylbenzothiazylsulfenamide, Sunseller CM-G, manufactured by Sanshin Chemical Industry Co., Ltd.

As is clear from Tables 1 and 2, the rubber compositions (Examples 1 to 7) of the present invention were excellent in both wear resistance and flame retardancy.
On the other hand, when it did not contain a specific flame retardant (Comparative Example 1), it was inferior in flame retardancy. Moreover, when there was too much content of a specific flame retardant (comparative example 2 and 3), it was inferior to abrasion resistance. Furthermore, when only EPDM was used as a rubber component corresponding to a conventional outer hood (Comparative Example 4), the abrasion resistance was poor.

It is a typical partial perspective view for demonstrating one Embodiment with the outer hood of this invention attached to the vehicle. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and is a schematic cross-sectional view of a side portion of an outer hood of a railway vehicle when the vehicle travels on a linear rail or a rail having a small curvature. It is typical sectional drawing of the side part of the outer peripheral side of the rail of the outer hood of a railway vehicle when a vehicle drive | works on a rail with a large curvature. It is typical sectional drawing of the side part of the inner peripheral side of the rail of the outer hood of a railway vehicle when a vehicle drive | works on a rail with a large curvature. It is typical sectional drawing of the shoulder part of the inner peripheral side of the rail of the outer hood of a railway vehicle when a vehicle drive | works on a rail with a large curvature. FIG. 6 is a schematic partial perspective view for explaining another shape of the flexible film body 6 constituting the linear member 3 of the outer hood 2. It is explanatory drawing for demonstrating the attachment method of the flexible film body which comprises the linear part of an outer hood. It is explanatory drawing for demonstrating the attachment method of a cyclic | annular outer hood. It is a typical perspective view of the shoulder part member of the outer hood obtained in the Example of this invention. It is explanatory drawing of the method of an abrasion resistance test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Outer hood 3 Linear member 4, 4 ', 4 "Shoulder member 5 Passage 6 Flexible film body 7 Center vicinity 8 Flange part 9 Through-hole 10 Outer surface 11 Curved part 20 Upper surface 20' Lower surface

Claims (3)

100 parts by mass of a rubber component containing 30 to 100% by mass of natural rubber and 0 to 70% by mass of one or more rubbers selected from the group consisting of styrene-butadiene rubber, butadiene rubber and ethylene-propylene-diene rubber;
A rubber composition for an outer hood of a railway vehicle comprising the following component (1) or (2):
(1) 30 to 85 parts by mass of aluminum hydroxide, 20 to 50 parts by mass of decabromodiphenyl ether and 10 to 20 parts by mass of ammonium polyphosphate (2) 30 to 90 parts by mass of aluminum hydroxide, 10 to 50 parts by mass of chlorinated paraffin and 3-20 parts by mass of antimony trioxide 100 parts by mass of a rubber component containing 30 to 100% by mass of natural rubber and 0 to 70% by mass of one or more rubbers selected from the group consisting of styrene-butadiene rubber, butadiene rubber and ethylene-propylene-diene rubber;
  The following component (1) or (2)
A rubber composition for an outer hood shoulder member of a railway vehicle, comprising:
  (1) 30 to 85 parts by mass of aluminum hydroxide, 20 to 50 parts by mass of decabromodiphenyl ether and 10 to 20 parts by mass of ammonium polyphosphate
  (2) 30 to 90 parts by mass of aluminum hydroxide, 10 to 50 parts by mass of chlorinated paraffin and 3 to 20 parts by mass of antimony trioxide Outer hood railway vehicle using the rubber composition described as a material to claim 1 or 2.

Images