JP6767313B2 - Non-combustible fiber reinforced resin pultruded body - Google Patents

Description

The present invention, in the railway field, in which about the fiber-reinforced resin pultruded body to impart incombustibility to be used for the upper surface protection plate that is arranged above the third rail.

In the railway field and construction field, there is an increasing demand for lightweight and strong fiber reinforced plastic (FRP) molded bodies, but structural members in these fields are concerned about burning or spreading in the event of a fire. In order to wipe it off, it is necessary to make it flame-retardant and non-flammable. In particular, in the railway field, flame retardancy and non-combustibility are strictly required to prevent the spread of damage. In addition, there are many long products, and it is said that pultruded products are advantageous from the viewpoint of performance and productivity.

As a flame retardant used in such a fiber-reinforced resin, as described in Patent Document 1 below, hydroxide that lowers the combustion temperature by an endothermic dehydration reaction and suppresses heat transfer by forming chars when a fire occurs. In many cases, aluminum is the main ingredient and antimony trioxide is added as an auxiliary agent to enhance the effect.

Further, Patent Document 2 below describes a technique for producing a pultruded product using aluminum hydroxide or antimony trioxide as a flame retardant.

JP-A-11-333939 Japanese Patent Application Laid-Open No. 6-270276

However, when aluminum hydroxide is added in a large amount, the viscosity of the resin increases, which makes pultrusion difficult. In addition, antimony trioxide is considered to be slightly toxic, and it is desirable to refrain from using it as much as possible.

Therefore, the present invention specifies the range of the amount of aluminum hydroxide added to the resin in the fiber-reinforced resin molded product in consideration of the relationship with the thickness of the molded product, and does not depend on antimony trioxide and is necessary for non-combustibility. It is an object of the present invention to obtain properties and enable pultrusion.

In order to solve the above problems, the present invention is a nonflammable fiber reinforced resin pultruded body in which aluminum hydroxide as a flame retardant is mixed with a resin , and the molded thickness is 3.5 mm or more and less than 4.0 mm. In the range, it was decided to provide a resin in which aluminum hydroxide is blended in a range of 270 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin.

Further, in this nonflammable fiber reinforced resin pultruded body , aluminum hydroxide is 220 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin in the range where the molded thickness is 4.0 mm or more and less than 6.5 mm. In the case where the molded thickness is 6.5 mm, aluminum hydroxide is blended in the range of 170 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin.

Further, it is assumed that the resin is an unsaturated polyester resin.

Further, it was decided to provide the nonflammable fiber reinforced resin pultruded body used for the upper surface protective plate installed above the third rail of the railway .

When Ru good in the present invention, the addition ratio to the resin of the aluminum hydroxide is a flame retardant, while considering the relationship between the thickness of the molded article, the required non-flammable is obtained and the viscosity increase is suppressed, Having defined the scope of pultrusion is possible, with the addition of aluminum hydroxide in the range, excellent products incombustible used on the upper surface protection plate that is installed above the rail third rail, It can be efficiently manufactured by pultrusion.

A perspective view showing a top protective plate for a third rail of a railway, which is an example of commercialization of a nonflammable fiber reinforced resin pultruded body according to the present invention. (2A) Longitudinal side view of the first embodiment, (2B) Longitudinal side view of the second embodiment of the same top surface protection plate. Schematic explanatory view showing the manufacturing method by the same pultrusion molding apparatus Perspective view showing a combustion test method

As a product of the nonflammable fiber reinforced resin pultruded body according to the present invention, as shown in FIG. 1, an upper surface protective plate 1 installed above the third rail 3 of the railway can be mentioned.

The third rail 3 is laid along one side of a railroad track in which two rails 2 are parallel to each other, and a collector shoe protruding from a bogie of a railroad vehicle running on the rail 2 slides on the upper surface of the railroad vehicle. It supplies power.

The upper surface protective plate 1 installed so as to cover the upper surface of the third rail 3 prevents electric shock due to unexpected contact with the upper surface of the third rail 3, and protects the upper surface of the third rail 3 from rainfall, snowfall, etc. To do.

As shown in FIG. 2 (2A), the upper surface protective plate 1 is a groove-shaped material with a lip whose inside is completely hollow and has a thickness of about 6.5 mm, or FIG. 2 As shown in (2B), a grooved material with a lip having a plurality of ribs 1a inside and having a thickness of about 4.0 mm or the like is adopted.

The upper surface protective plate 1 made of such a fiber-reinforced resin molded body is manufactured by, for example, a pultrusion molding apparatus as shown in FIG.

This pultrusion molding apparatus draws out glass rovings 11 from a plurality of bobbins, unwinds continuous strand mats 12 above and below the glass rovbins, impregnates them with the resin composition 14 in the impregnation tank 13, and then impregnates the guides 15. The resin-impregnated reinforcing fiber that has passed through the inside and has been shaped is heat-cured as it passes through the curing mold 16, and then the obtained molded body 17 is picked up by a take-up machine 18 and appropriately sized by a cutting machine 19. It cuts into.

If the upper surface protective plate 1 of the molded product manufactured in this way is flammable, if it ignites for some reason, the fire will spread over a long distance, and there is a risk of serious damage to railway equipment. , The material of the upper surface protection plate 1 is required to be strictly nonflammable.

Here, as a reference, the combustion test (non-metallic material for railroad vehicles) method specified by the Japan Railway Rolling Stock and Mechanical Technology Association is given.

In this test method, as shown in FIG. 4, a B5 size (182 mm × 257 mm) specimen 20 is held at an angle of 45 °, and the center of the bottom of the fuel container 21 is vertically downward 25 of the center of the lower surface of the specimen 20. Place it on a container cradle 22 made of a material with low thermal conductivity such as cork so that it is located at .4 mm (1 inch), put 0.5 cc of pure ethyl alcohol in the fuel container 21 and ignite it until the fuel burns out. put.

The combustion judgment in the above test is divided into during combustion and after combustion of alcohol, and during combustion, ignition, ignition, smoking state, flame state, etc. of the specimen 20 are observed, and after combustion, residual flame and residual flame are observed. Investigate dust, carbonization, and deformation.

In the pre-test treatment of the specimen 20, in the case of a hygroscopic material, a material finished to a predetermined size is allowed to pass for 5 days or more in a breathable room away from direct sunlight by 1 m or more from the floor surface. The conditions in the test room are temperature: 15 ° C to 30 ° C, humidity: 60% to 75%, and no air flow.

The combustibility standards for railway vehicle materials based on the results of such combustion tests are specified as shown in Table 1 below.

According to Table 1, in order to be certified as nonflammable, there is no ignition or ignition during combustion of alcohol, smoke is slight, and after combustion of alcohol, carbonization is suppressed to discoloration of 100 mm or less, and deformation is suppressed. It is necessary that the surface deformation is 100 mm or less.

Then, in carrying out the present invention, as the resin, a low-viscosity resin was used so as to suppress an increase in viscosity when a large amount of flame retardant was added. Specifically, an unsaturated polyester resin was used.

Further, if the amount of aluminum hydroxide added as a flame retardant is more than 300 parts by weight, the viscosity exceeds 400 dPa · S and pultrusion becomes difficult. Therefore, the amount of aluminum hydroxide added is limited to 300 parts by weight. And said.

Next, it was confirmed how the required flame retardant (aluminum hydroxide) changes depending on the thickness of the molded product. The results are shown in Table 2.

According to Table 2, in the range where the thickness of the molded product is 3.5 mm or more and less than 5.0 mm, if aluminum hydroxide is blended in the range of 220 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin, Nonflammability can be reliably obtained, and when the thickness of the molded product is 5.0 mm or more and 6.5 mm or less, aluminum hydroxide is blended in the range of 170 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin. If it is done, nonflammability can be surely obtained.

Then, based on the above findings, when the addition ratio of the flame retardant aluminum hydroxide to the resin is determined in consideration of the relationship with the thickness of the molded product, the upper surface protective plate 1 shown in FIGS. 1 and 2 is determined. The product of the nonflammable fiber reinforced resin pultruded body as described above can be manufactured by pultrusion molding using the pultrusion molding apparatus shown in FIG.

1 Top protective plate 1a Rib 2 Rail 3 Third rail 11 Glass roving 12 Continuous strand mat 13 Impregnation tank 14 Resin composition 15 Guide 16 Hardened mold 17 Mold 18 Picker 19 Cutting machine 20 Specimen 21 Fuel container 22 Container cradle

Claims (1)

It is a nonflammable fiber reinforced resin pultruded body in which aluminum hydroxide as a flame retardant is mixed with unsaturated polyester resin.
In the range of the molded thickness of 3.5 mm or more and less than 4.0 mm, aluminum hydroxide is blended in the range of 270 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin .
In the range of the molded thickness of 4.0 mm or more and less than 6.5 mm, aluminum hydroxide is blended in the range of 220 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin.
When the molded thickness is 6.5 mm, aluminum hydroxide is blended in a range of 170 parts by weight or more and 300 parts by weight or less with respect to 100 parts by weight of the resin.
A non-combustible fiber reinforced resin pultruded body characterized by being used for a top protective plate installed above the third rail of a railway .

Images