JP2020051538A - High-pressure hydrogen storage tank for fuel cell vehicle and method of manufacturing the same - Google Patents

Abstract

To provide an on-vehicle tank for high-pressure hydrogen storage which improves productivity and improves repeated fatigue resistance by remarkably improving stability under a toe prepreg storage and usage environment in the high-pressure hydrogen tank which is manufactured by a filament winding method via a toe prepreg, and a manufacturing method thereof.SOLUTION: The present invention relates to a high-pressure hydrogen tank in which a tape-like prepreg is wound and cured on an outer surface of the high-pressure hydrogen tank. In the high-pressure hydrogen tank, a thermally curable resin composition (A) and a carbon fiber bundle (B) constituting the prepreg satisfy following requirements that (A) the thermally curable resin composition is a composition containing (A-1) a liquid-state bisphenol type epoxy resin of which the viscosity at 25°C is 4,000 to 8,000 mPa s, (A-2) dicyandiamide, (A-3) an imidazole-based accelerator and (A-4) a granular core shell type rubber, the solid components (A-2) and (A-3) are diffused in the composition and an aggregate of 25 μm or more is not contained and (B) the carbon fiber bundle is constituted of 10,000 to 50,000 carbon fibers of which an average diameter of the carbon fibers is 5 to 8 μm.

Description

  The present invention relates to a high-pressure hydrogen storage tank for a fuel cell vehicle equipped with a reinforcing layer made of a carbon fiber reinforced composite material on the outer surface of a sealable plastic hollow container and a method of manufacturing the same.

  In recent years, global warming countermeasures have become an urgent issue, and a fuel cell that uses hydrogen as an energy source has been installed as one of the solutions to reduce fossil energy consumption of transportation equipment, mainly automobiles. Vehicles have been put to practical use.

  In order to generate electricity as a power source of a vehicle using a fuel cell, it is essential to mount hydrogen in a moving vehicle. The more hydrogen is compressed at a high pressure, the more it can be mounted, which has a great effect on the mileage of the vehicle.

  It is desirable to use as light a material as possible for a vehicle-use high-pressure hydrogen tank that stores compressed hydrogen in order to extend the traveling distance of the vehicle. The structure is a plastic hollow container (liner) with gas barrier properties in the innermost layer. In general, means for reinforcing the outer surface with carbon fiber reinforced plastic (CFRP) has been adopted.

  For high-pressure hydrogen storage tanks, for safety, the maximum pressure that causes the tank to burst and the resistance to repeated fatigue during repeated filling are required. This is the most important characteristic required for hydrogen storage tanks.

  As a method for producing a high-pressure hydrogen tank reinforced with CFRP, a tape-shaped carbon fiber (CF) / resin is impregnated with a resin composition containing a resin and a curing agent around a liner formed into a hollow container. A technique (filament winding method) of manufacturing a CFRP tank by winding a composition composite to form a reinforcing layer and then curing the resin composition by means such as heating is known. Carbon fibers have high strength and rigidity in the fiber direction, and can be wound at various angles to form a tank having a strength that can withstand the internal pressure during high-pressure hydrogen filling.

  As a technique for manufacturing a CFRP tank, in the above-described filament winding method, a method in which a carbon fiber bundle is impregnated with a resin composition before curing and wound around a liner through a single pass (wet method), and a resin composition before curing is used. After preparing a tape-shaped prepreg (tuprepreg) in which an object is impregnated in a carbon fiber bundle, the method is roughly classified into a method (dry method) of winding the tuprepreg around a liner in another step.

  The wet method is simple because the process is straight through, but the impregnation and winding are one process, so the amount of resin to be impregnated becomes unstable due to the change in winding speed, and the winding speed is increased for mass production. Raise the problem that resin impregnation failure and resin scattering occur. In the dry method, the process of creating the tuprepreg and the process of winding it around the liner are separated, so that the problems of the wet method can be avoided.In general, the latter method is not suitable for mass production from the viewpoint of quality stability. Are better. However, on the other hand, storage stability of tuprepreg is required.

As for the material constituting the CFRP tank for storing high-pressure hydrogen, for example, Patent Document 1 discloses elastomer particles and / or thermoplastic resin particles dispersed in a thermosetting resin without being localized in a reinforcing fiber bundle. A high-pressure gas tank in which strength, heat resistance, and gas permeability are suppressed by performing the method, and a method for manufacturing the same are disclosed. By using this technology, it is possible to increase the fracture toughness value of the matrix component and increase the strength of CFRP, thereby improving the system against repeated fatigue.On the other hand, this technology is compatible with the wet construction method, An acid anhydride is used as an agent.In the dry method, tuprepregs are stored frozen, then thawed, and because of the effect of moisture in the use environment, the cured product lacks quality stability, so even in mass production. The most suitable material for the dry method with excellent quality stability was required.
Patent Literature 2 discloses a gas cylinder using a yarn prepreg in which a thermosetting resin composition is impregnated into a reinforcing fiber bundle and an elastomer and / or a thermosetting resin is unevenly distributed near the surface thereof, and a method for producing the same. Have been. The method in which the present technology is also exemplified is a wet method, and there is no description about the storage stability of the yarn prepreg.

JP 2012-63015 A JP 08-219386 A

  The present invention has been made in view of such a situation, and provides a high-pressure hydrogen tank manufactured by a filament winding method (dry method) via a tuprepreg and a method for manufacturing the same. An object of the present invention is to provide an in-vehicle high-pressure hydrogen storage tank and a method for manufacturing the same, in which stability under storage and use environments is dramatically improved, productivity is improved, and repeated fatigue resistance is enhanced.

  In order to solve the above-mentioned problems, the present inventors have intensively studied and used a solid latent curing agent and a curing accelerator in order to enhance the storage stability of tuprepreg, and also improved the repeated fatigue resistance. For this purpose, they have found that, using a particulate core / shell type rubber, it is possible, for the first time, to achieve both of these characteristics in an advanced combination with an epoxy resin, and have completed the present invention.

（Ａ−４）粒子状のコアシェル型ゴム、及び、前記炭素繊維束（Ｂ）は、１万〜５万本の平均直径が５〜８μｍである炭素繊維から構成されることを特徴とする高圧水素タンクである。 That is, the present invention is a high-pressure hydrogen tank for mounting on a fuel cell vehicle, which is provided with a reinforcing layer on the outer surface of a sealable plastic hollow container, wherein the reinforcing layer is formed of a resin on the outer surface of the hollow container. A prepreg layer formed by winding a tape-shaped prepreg having a weight ratio (A) :( B) of the composition (A) and the carbon fiber bundle (B) of 20 to 30:80 to 70 is formed at 140 ° C. or higher. It is a layer formed by curing at the temperature of
The thermosetting resin composition (A) contains the following components (A-1), (A-2), (A-3) and (A-4) as essential components. When the total is 100 parts by weight, the respective mixing ratios (weight ratios) are (A-1) / (A-2) / (A-3) / (A-4), and are 88.0 to 85.0. /4.5-5.5/2.5-3.5/9.0-11.0, and the solid components (A-2) and (A-3) are thermosetting compositions. Being dispersed therein and containing no aggregates or solids of 25 μm or more,
(A-1) A liquid bisphenol F type epoxy resin is composed of 80 to 85 parts by weight with respect to a liquid bisphenol A type epoxy resin of 20 to 15 parts by weight, and has a viscosity at 25 ° C of 4000 to 8000 mPa · s. A-2) Dicyandiamide (A-3) a curing accelerator represented by the following formula (1) and / or (2);

(A-4) High pressure wherein the particulate core-shell rubber and the carbon fiber bundle (B) are composed of 10,000 to 50,000 carbon fibers having an average diameter of 5 to 8 μm. It is a hydrogen tank.

  The present invention also relates to a method for producing a high-pressure hydrogen tank for mounting on a fuel cell vehicle, comprising a reinforcing layer provided on the outer surface of a sealable plastic hollow container. After the curable resin composition (A) is wound around the carbon fiber bundle (B) with a tape-shaped prepreg impregnated at a ratio of (A) 20 to 30% by weight and (B) 80 to 70% by weight, A fuel wherein the reinforcing layer is formed by curing and fixing at a temperature of not less than ℃, and the thermosetting resin composition (A) and the carbon fiber bundle (B) constituting the reinforcing layer satisfy the above requirements. This is a method for manufacturing a high-pressure hydrogen tank for mounting on a battery car.

  ADVANTAGE OF THE INVENTION According to this invention, the storage stability of tuprepreg can be improved remarkably, and storage and management under special conditions, such as freezing and refrigeration, can be made unnecessary. In addition, it contributes to the stability of mass production of high-pressure hydrogen tanks having excellent fatigue resistance.

FIG. 3 is a diagram illustrating a configuration of a high-pressure hydrogen tank.

Hereinafter, the present invention will be described in detail.
In the present specification, the thermosetting resin composition (A) has epoxy resin (A-1), a latent curing agent (A-2), a curing accelerator (A-3) as a component, and a reinforcing material. (A-4) as an essential component. The reinforcing layer in the high-pressure hydrogen tank of the present invention comprises the thermosetting resin composition (A) and the carbon fiber bundle (B). Hereinafter, the thermosetting resin composition (A), the epoxy resin (A-1), the latent curing agent (A-2), the curing accelerator (A-3), the reinforcing material (A-4), and the carbon fiber bundle Component (B) is also referred to as component (A), component (A-1), component (A-2), component (A-3), component (A-4), and component (B), respectively. The prepreg formed into a tape by impregnating the component (A) with the component (B) is also called a tuprepreg.

  First, the thermosetting resin composition of the component (A) will be described.

The epoxy resin (A-1) constituting the component (A) contains both a liquid bisphenol A type epoxy resin and a liquid bisphenol F type epoxy resin, and the mixing ratio thereof is 20 to 15 parts by weight of the bisphenol A type epoxy resin. The bisphenol F type epoxy resin is 80 to 85 parts by weight, and has a viscosity at 25 ° C of 4000 mPa · s to 8000 mPa · s.
This viscosity is a viscosity measured at 25 ° C. using an E-type viscometer (cone plate type). If the viscosity of the component (A-1) is less than 4000 mPa · s, dripping tends to occur at the time of threading or winding during production of tuprepreg, and undesired unwinding occurs at the time of filament winding. If it exceeds 8000 mPa · s, the carbon fiber cannot be sufficiently impregnated at the time of impregnation, and voids are easily generated at the time of filament winding. Preferably it is 4000 mPa · s to 6000 mPa · s.

  The latent curing agent (A-2) constituting the component (A) is dicyandiamide. Dicyandiamide is a solid epoxy resin curing agent having a thermal decomposition temperature of 200 ° C. or higher. Being a solid, it hardly dissolves in epoxy resin at room temperature, but it dissolves when heated to 100 ° C or more, and has the property of reacting with epoxy groups, so its potential for storage stability at room temperature and excellent cost It is a curing agent.

  The curing accelerator (A-3) constituting the component (A) is 2,4-diamino-6- [2′-ethyl-4′-methylimidazolyl- (1 ′)] represented by the formula (1). -Ethyl-S-triazine isocyanuric acid adduct and / or 2,4-diamino-6- [2′-methylimidazolyl- (1 ′)]-ethyl-s-triazine represented by the formula (2). These may be used alone or in combination of two or more. It is solid and has excellent stability.

  The reinforcing material (A-4) constituting the component (A) is a rubber particle having a core-shell structure in which the surface of a rubber particle insoluble in the crosslinked epoxy resin (A-1) is coated with a non-rubber component. In this case, the non-rubber component to be coated may be one which dissolves or swells in the epoxy resin like polymethyl methacrylate, and is more preferable because the particles can be well dispersed in the epoxy resin. An advantage of using rubber particles having a core-shell structure insoluble in an epoxy resin is that the effect on the heat resistance of the cured resin is small.

  The addition of the core-shell type rubber component has the effect of improving the tackiness of the prepreg, in addition to the effect of improving the toughness, and the average particle diameter is preferably 1 to 500 nm in volume average particle diameter, preferably 3 to 300 nm. It is more preferable if there is.

  The mixing ratio of the components (A-1) to (A-4) constituting the component (A) is (A-1) / (A-2) / (A-3) / (A-4) = 80. 0 to 85.0 / 4.5 to 5.5 / 2.5 to 3.5 / 9.0 to 11.0 (weight%, the total mixing ratio of the four components must be 100 weight%). is there. If the ratio of the component (A-2) to the component (A-3) is out of the above range, the curing may be insufficient or the heat resistance of the cured product may be reduced. When the ratio of the component (A-4) is below the above range, the fracture toughness which affects the fatigue resistance decreases, and when it exceeds the above range, the rigidity and heat resistance decrease.

  The component (A) is produced by uniformly mixing the components (A-1) to (A-4). The raw materials can be mixed by a known and commonly used method. For example, a rotation revolving centrifugal stirrer may be used, dispersion may be performed by a disper, or roll dispersion may be performed. Other methods may be used, or these methods may be combined. However, when the temperature is high, the curing agent and the like may be partially dissolved in the epoxy resin, and the storage stability may be deteriorated. Therefore, the kneading temperature is 50 ° C or lower, preferably 40 ° C or lower. It is better to mix under conditions.

  It is necessary that the component (A) and the component (A-3), which are solid after mixing, do not contain aggregates. When the size of the aggregate is 5 times or more the diameter of the carbon fiber, the influence on the fatigue characteristics is increased. If the solid component agglomerates are included, the criterial number of times will not be satisfied in the normal temperature pressure cycle test of the tank. The component (A-4) is also solid, but can be well dispersed in the composition by using a master batch in which rubber particles are dispersed in an epoxy resin in advance.

  The carbon fiber bundle (B) which forms tuprepreg together with the component (A) has only to have an average diameter of carbon fibers of 5 to 8 μm and be composed of 10,000 to 50,000 carbon fibers. . Speaking of the constant-length type, those having a fineness of 500 to 3000 TEX are preferable. The carbon fiber bundle is, for example, T700SC-12000-50C (diameter 7 μm, density 1.8 g / cm3, fineness 802 TEX) manufactured by Toray Industries, Inc., T720SC-36000-50C (diameter 6 μm, density 1.8 g / cm3, manufactured by Toray Industries, Inc. Fineness 1650 TEX), but the present invention is not limited to these.

  The method for producing tuprepreg is not particularly limited. For example, the component (A) whose viscosity has been reduced by heating is formed into a film on a roll or release paper, then transferred to one or both sides of the carbon fiber bundle (B), and then passed through a bending roll or a pressure roll. It can be produced by a method of impregnation by pressing or a method of impregnating and winding the component (A) while heating and lowering the viscosity of the component (A) while coating the component (B).

  For example, in the latter method of producing a tuprepreg, by balancing the threading speed and the amount of resin applied, a tuprepreg containing a desired amount of resin can be produced.

  It is necessary that the ratio of the component (A) to the component (B) in the tuprepreg is (A) 20 to 30% by weight and (B) 80 to 70% by weight. When the proportion of the component (A) is less than 20% by weight, the thermosetting resin composition cannot sufficiently fill the carbon fiber voids, so that it is difficult for force to be transmitted between the carbon fibers, and as a criterion for the initial burst test. Under pressure. If it exceeds 30% by weight, it is enough to fill the carbon fiber voids, but if the number of turns is the same when forming the tank, the amount of carbon fibers will be insufficient, and the initial burst test value will decrease or the number of turns will increase to compensate for it. As a result, the cost is increased, and the effect of weight reduction is lost.

  The tuprepreg thus obtained is wound around a plastic hollow container (liner) that can be hermetically sealed by a filament winding method. The fiber reinforced plastic layer is preferably formed by winding a tow prepreg around a liner and a base by a filament winding method (hereinafter, FW method). The liner can be wound using a known hoop winding, low-angle, high-angle helical winding, or the like.

  Thereafter, the mixture is cured and fixed at a temperature of 140 ° C. or higher, whereby the high-pressure hydrogen tank of the present invention is obtained. If the curing and fixing temperature is lower than 140 ° C., the curing time is required to be 2 hours or more, and the productivity of the tank deteriorates. The upper limit of the curing and fixing temperatures is determined by the heat resistance of the plastic material constituting the liner.

  Hereinafter, the present invention will be described more specifically with reference to examples.

The raw materials of the thermosetting resin composition (A) are as follows.
(A-1) Component / Liquid bisphenol F type epoxy resin: YDF-170 (manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.)
(Epoxy equivalent: 160 to 180 g / eq, viscosity: 2000 mPa · s to 5000 mPa · s)
-Liquid bisphenol A type epoxy resin: Epoxy masterbatch of component (A-4) (A-2) component-Dicyandiamide: DICYANEX1400F (manufactured by AIRPRODUCT)
(A-3) Component 2MZA-PW (manufactured by Shikoku Chemicals) 2,4-diamino-6- [2'-ethyl-4'-
Methylimidazolyl- (1 ′)]-ethyl-s-triazine.2MAOK-PW (manufactured by Shikoku Chemicals) 2,4-diamino-6- [2′-ethyl-4 ′
-Methylimidazolyl- (1 ′)]-ethyl-s-triazine isocyanuric acid adduct (A-4) component MX-154 (manufactured by Kaneka Corporation): epoxy masterbatch (compounding amount of core-shell rubber: 40 wt%, BPA type epoxy) Resin blending amount 60 wt%, average particle size 100 nm, manufactured by Kaneka Corporation)
Other curing agent (A-2 ′) component ・ Diethylmethylbenzenediamine: Etacure 100 (manufactured by Albemarle, liquid at room temperature)

The following materials were used as the carbon fiber bundle (B) to obtain tuprepreg.
・ T720SC-36000-50C: manufactured by Toray Industries, Inc. (diameter 6 μm, density 1.8 g / cm ³ , number 36000, fineness 1650 TEX)

Preparation of Tuprepreg Using a known tuprepreg manufacturing apparatus, the component (A) obtained by blending the above-mentioned raw materials was added to the carbon fiber bundle (B) so that the content of the component (A) was 20 to 30 wt%. It is prepared by adjusting the application.

Preparation of high-pressure hydrogen tank First, prepare a liner with a base. Next, the prepared tuprepreg is wound around the liner using a hoop winding and a low-angle, high-angle helical winding by a filament winding method.
Thereafter, the tuprepreg is cured in a heating furnace. The resin is heated in a heating furnace to thermally cure the epoxy resin, thereby forming a fiber-reinforced plastic layer as a reinforcing layer on the outer surface of the liner.

Configuration of high-pressure hydrogen tank FIG. 1 shows the configuration of the produced tank. The high-pressure tank (10) comprises an innermost resin liner (12), bases (14, 16), and a fiber-reinforced plastic layer (40). The bases are provided at both ends in the longitudinal direction of the liner. The liner is formed by molding a resin having a barrier property against hydrogen gas such as a nylon resin. The reinforced plastic layer (40) is formed on the outer surface of the liner and the base. The fiber reinforced plastic layer is formed by winding a tow prepreg around a liner and a base by a filament winding method.

The measuring method is described below.
(1) Presence or absence of curing agent and curing accelerator aggregate:
Based on JIS K 5600-2, the presence or absence of aggregates of a solid curing agent and a curing accelerator of 25 μm or more was evaluated using a grind gauge (particle size gauge).
(2) Storage stability of tuprepreg:
Using a tuprepreg stored in a thermo-hygrostat controlled at 23 ° C. and 50% RH for 48 hours, the presence or absence of tackiness was evaluated by touch.
(3) High pressure hydrogen tank test:
The following tests were conducted in accordance with the Container Safety Regulations and the interpretation of the technical standards for containers for fuel cells of compressed hydrogen vehicles.
Initial burst test: judgment criteria 157.5 MPa or more was judged as pass (○), and less than 157.5 MPa was judged as unacceptable (x).
Room temperature pressure cycle test 2Ma@87.5MPa
Judgment criteria: 22,000 times or more No rupture was judged as pass (○), and less than rupture was judged as unacceptable (x).

Formulation Example 1
After mixing a part (30%) of YDF-170, DICYANEX, 2MZA-PW, and 2MAOK-PW using a disperser (high-speed disperser), a preliminary dispersion (master batch) is prepared using a three-roll mill. Then, the remaining components (70%) of YDF-170 and MX-154 are charged so that each component has the material and the mixing ratio shown in Table 1, and then charged into a 50 L planetary mixer (planetary kneader). The mixture was kneaded for 1 hour while externally cooling with water so that the temperature did not exceed 50 ° C., to obtain a thermosetting resin composition (A-a).

Formulation Example 2
The YDF-170, Ethacure 100, and MX-154 components were charged into a 50 L planetary mixer so that the ingredients and mixing ratios shown in Table 1 were obtained, and water cooling was performed externally so that the upper limit temperature did not exceed 50 ° C. The mixture was kneaded for 1 hour to obtain a thermosetting resin composition (Ab).

Example 1
The thermosetting resin composition (A-a) obtained in Formulation Example 1 was coated and impregnated on a carbon fiber bundle T720SC-36000-50C to obtain a tuprepreg, and then a nylon made with a die attached by a filament winding method. It was wound around a liner, put into a heating furnace, and cured at 120 ° C. for 60 minutes + 160 ° C. for 60 minutes to obtain a high-pressure hydrogen tank having a CFRP reinforcing layer. The median particle size D50 of DICYANEX was 2.5 μm, the D50 of 2MZA-PW was 4.2 μm, and the D50 of 2MAOK-PW was 3.0 μm. The content of the thermosetting resin composition (Aa) in the obtained tuprepreg was 25% by weight.

Example 2
A method similar to that of Example 1 except that the three components of DICYANEX, 2MZA-PW, and 2MAOK-PW were mixed in advance and then pulverized (D50: 1.2 μm) in Formulation Example 1. Thus, a tuprepreg and a high-pressure hydrogen tank were obtained.

Comparative Example 1
The same method as in Example 1 except that the thermosetting resin composition (A) was obtained by kneading with only the planetary mixer at the same mixing ratio as in Formulation Example 1 of Table 1 without performing the preliminary dispersion. Thus, a tuprepreg and a high-pressure hydrogen tank were obtained.

Comparative Example 2
A tuprepreg and a high-pressure hydrogen tank were obtained in the same manner as in Example 1 except that the thermosetting resin composition (Ab) described in Formulation Example 2 was used as the thermosetting resin composition.

Comparative Example 3
A thermosetting resin composition (A), tuprepreg, and a high-pressure hydrogen tank were obtained in the same manner as in Example 1 except that the curing temperature was changed to 130 ° C. for 2 hours.

Comparative Example 4
A high-pressure hydrogen tank was obtained in the same manner as in Example 1 except that the amount of the component (A) applied and impregnated was adjusted when producing tuprepreg, and the content of the component (A) was adjusted to 18% by weight. Was.

Comparative Example 5
A high-pressure hydrogen tank was obtained in the same manner as in Example 1 except that the amount of component (A) applied and impregnated was adjusted when producing tuprepreg, and the content of component (A) was adjusted to 40% by weight. Was.

Table 1 shows the compounding ratio of each component of the examples and comparative examples.

Table 2 shows the evaluation results of the examples and the comparative examples.

Reference Example Since the epoxy resin of the component (A-1) used as a raw material includes those contained in the component (A-4), the liquid bisphenol contained in the MX-154 used as the component (A-4) Using YD-128 having the same molecular weight and molecular weight distribution as the A-type epoxy resin, the viscosity of the component (A-1) in the examples and comparative examples was measured. The viscosity at 25 ° C. was measured using an E-type viscometer (cone plate type). Table 3 shows the results.

Claims (2)

A high-pressure hydrogen tank for mounting on a fuel cell vehicle, comprising a reinforcing layer on the outer surface of a sealable plastic hollow container,
The reinforcing layer is a tape-shaped prepreg having a weight ratio (A) :( B) of the resin composition (A) to the carbon fiber bundle (B) of 20 to 30: 80 to 70 on the outer surface of the hollow container. Is a layer formed by curing a prepreg layer formed by winding at a temperature of 140 ° C. or higher,
The thermosetting resin composition (A) contains the following components (A-1), (A-2), (A-3) and (A-4) as essential components. When the total is 100 parts by weight, the respective mixing ratios (weight ratios) are (A-1) / (A-2) / (A-3) / (A-4), and are 88.0 to 85.0. /4.5-5.5/2.5-3.5/9.0-11.0, and the solid components (A-2) and (A-3) are thermosetting compositions. Being dispersed therein and containing no aggregates or solids of 25 μm or more,
(A-1) A liquid bisphenol F type epoxy resin is composed of 80 to 85 parts by weight with respect to a liquid bisphenol A type epoxy resin of 20 to 15 parts by weight, and has a viscosity at 25 ° C of 4000 to 8000 mPa · s. A-2) Dicyandiamide (A-3) a curing accelerator represented by the following formula (1) and / or (2);

(A-4) Particulate core-shell type rubber, and
The high-pressure hydrogen tank, wherein the carbon fiber bundle (B) is composed of 10,000 to 50,000 carbon fibers having an average diameter of 5 to 8 μm. A method for manufacturing a high-pressure hydrogen tank for mounting on a fuel cell vehicle, comprising a reinforcing layer provided on an outer surface of a hermetically sealable plastic hollow container, wherein a thermosetting resin composition before curing is provided on an outer surface of the hollow container. A) is wound around a carbon fiber bundle (B) with a tape-shaped prepreg impregnated at a ratio of (A) 20 to 30% by weight and (B) 80 to 70% by weight, and then cured at a temperature of 140 ° C. or more. A high-pressure hydrogen for mounting on a fuel cell vehicle, wherein the thermosetting resin composition (A) and the carbon fiber bundle (B) constituting the reinforcing layer satisfy the following requirements: Tank manufacturing method.
(A) Consisting of the following four essential components (A-1), (A-2), (A-3) and (A-4), and (A-1) / (A-2) / (A -3) / (A-4) is 80.0-85.0 / 4.5-5.5 / 2.5-3.5 / 9.0-11.0 (weight%, 4 components) Is included in the composition, and the solid components (A-2) and (A-3) are dispersed in the composition. Thermosetting resin composition in which the components are dispersed,
(A-1) Liquid bisphenol A type epoxy resin and liquid bisphenol F type epoxy resin, the mixing ratio of which is 20 to 15 parts by weight of bisphenol A type epoxy resin and 80 to 85 parts by weight of bisphenol F type epoxy resin. Epoxy resin having a viscosity at 25 ° C. of 4000 to 8000 mPa · s (A-2) dicyandiamide (A-3) compound (1) and / or (2)

(A4) a particulate core-shell rubber;
(B) A carbon fiber bundle having an average diameter of carbon fibers of 5 to 8 μm and composed of 10,000 to 50,000 carbon fibers.

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