Rubber composition for fuel cell cooling hose and fuel cell cooling hose using the same

Abstract

To provide a rubber composition for a fuel cell cooling hose, and a fuel cell cooling hose using the same.SOLUTION: A rubber composition for a fuel cell cooling hose contains: 40-62 wt.% of a base resin containing an ethylene-propylene-diene copolymer (EPDM); 30-52 wt.% of a reinforcer; 2-4 wt.% of an activator; 2-3 wt.% of a plasticizer; and 1-2 wt.% of a crosslinking agent. The rubber composition for the cooling hose can be produced from a raw material at low cost, and a fuel cell cooling hose can be also manufactured by an extrusion type method using the composition, and accordingly economical efficiency can be secured. The fuel cell cooling hose manufactured using the rubber composition for the cooling hose can sure durability such as negative pressure property and a bursting pressure, and can also effectively suppress ion elution, and accordingly a life of a fuel cell is increased and performance of a fuel cell can be secured.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a rubber composition for a fuel cell cooling hose that reduces ion elution, and a fuel cell cooling hose using the same. [Background technology]

[0002] Fossil fuels remain the world's primary energy source, but numerous environmental issues are accelerating the shift to environmentally friendly energy sources for the sake of future society. In line with this trend, the automotive industry is also accelerating the development and adoption of environmentally friendly vehicles (hybrid vehicles, electric vehicles, etc.). Among these, fuel cell electric vehicles (FCEVs) are vehicles that use hydrogen and oxygen as fuel, and power an electric motor through the electrochemical reaction between these fuels (using fuel cells). Hydrogen electric vehicles are more energy efficient than conventional internal combustion engines, and because they only emit water or water vapor, they are attracting attention as pollution-free, environmentally friendly vehicles.

[0003] However, the commercialization of fuel cell vehicles has been slower than that of electric vehicles due to high vehicle prices and limited hydrogen charging infrastructure. Therefore, in order to expand the production and widespread use of fuel cell vehicles in the future, it is essential to ensure that parts specifically for fuel cell vehicles are price competitive.

[0004] Meanwhile, among the MEA (membrane electrode assembly), gaskets, separators, and cooling systems used in the fuel cell stack inside a fuel cell vehicle, the cooling hoses in the cooling system have traditionally been water-cooled systems using cooling water channels to maintain optimal temperature and maximize efficiency, with rubber hoses used as the passageway for supplying cooling water for water-cooled cooling.

[0005] However, if metal oxide ions inside the rubber material dissolve into the coolant and flow in excessively, it can poison the catalyst in the membrane-electrode assembly, inhibiting catalytic activity and reducing fuel cell efficiency. In addition, electricity generated in the stack due to the inflowing ions can flow through the coolant, potentially causing shocks to electrical devices and driving components.

[0006] To prevent this, the damage is minimized by applying control logic to specific sections, installing ion filters, or using silicone rubber, but this has the drawback of being expensive in terms of costs and process input costs.

[0007] Therefore, there is a demand for a rubber composition for a fuel cell cooling hose that can effectively suppress ion elution while ensuring durability and economic efficiency, and a fuel cell cooling hose using the same. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Publication No. 1994-0014583 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention is intended to solve these problems, and its specific objects are as follows.

[0010] The present invention aims to provide a rubber composition for a fuel cell cooling hose that can efficiently reduce ion elution while ensuring durability and economy, and a fuel cell cooling hose using the same.

[0011] The objects of the present invention are not limited to the above objects, but will become more apparent from the following description and be realized by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0012] A rubber composition for a fuel cell cooling hose according to one embodiment of the present invention comprises 40 to 62 wt% of a base resin including an ethylene-propylene-diene copolymer (EPDM); 30 to 52 wt% of a reinforcing agent; 2 to 4 wt% of an activator; 2 to 3 wt% of a plasticizer; and 1 to 2 wt% of a crosslinking agent.

[0013] The base resin may include at least one selected from the group consisting of metallocene-based EPDM and Ziegler-Natta-based EPDM.

[0014] The base resin may contain only the metallocene EPDM, or may contain the metallocene EPDM and Ziegler-Natta EPDM in a weight ratio of 1:0.3 to 2.5. The reinforcing agent may include one or more selected from the group consisting of carbon black, silica, and calcium carbonate.

[0015] The carbon black may have a dibutyl phthalate (DBP) oil absorption of 40 to 150 mL / 100 g and an iodine absorption number I2 of 10 to 50 mg / g.

[0016] The activator may contain 0.5 to 1 wt % of zinc oxide (ZnO); 0.5 to 1 wt % of olefin-based thermoplastic elastomer (thermoplastic olefin; TPO); and 1 to 2 wt % of stearic acid.

[0017] The weight ratio of the zinc oxide (ZnO):olefin-based thermoplastic elastomer (TPO) may be 1:1-2.

[0018] The olefin-based thermoplastic elastomer (TPO) has a specific gravity of 0.85 to 0.9 g / cm 3The melt index (MI) may be 0.3 to 0.7 g / 10 min (190° C. / 2.16 kg).

[0019] The plasticizer may include one or more selected from the group consisting of paraffin oil, naphthalene oil, and aromatic oil.

[0020] The crosslinking agent may include at least one selected from the group consisting of dicumyl peroxide (DCP), butyl peroxybenzoate, and butylperoxyhexane.

[0021] The rubber composition for a fuel cell cooling hose may further contain 1 to 2% by weight of an antioxidant.

[0022] A fuel cell cooling hose according to one embodiment of the present invention is produced by crosslinking the rubber composition for a fuel cell cooling hose, and may have an ion elution property of 0.7 to 7.0 μS / cm. [Effects of the Invention]

[0023] The present invention relates to a rubber composition for a fuel cell cooling hose and a fuel cell cooling hose using the same. The rubber composition for a cooling hose of the present invention can be produced using low-cost raw materials, and the fuel cell cooling hose can be produced using the composition by an extrusion method, ensuring economic efficiency. Furthermore, a fuel cell cooling hose produced using the rubber composition for a cooling hose not only ensures durability in terms of negative pressure resistance and burst pressure, but also effectively suppresses ion elution, thereby extending the life of the fuel cell and ensuring fuel cell performance.

[0024] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the following description. DETAILED DESCRIPTION OF THE INVENTION

[0025] The above and other objects, features, and advantages of the present invention will be readily understood from the following preferred embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete, and so that the concept of the present invention will be fully conveyed to those skilled in the art.

[0026] In this specification, the terms "comprise" or "have" and the like are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood in a sense that does not preclude the presence or possibility of addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0027] Unless otherwise specified, all numbers, values, and / or expressions expressing quantities of ingredients, reaction conditions, polymer compositions, and formulations used herein are approximations that reflect the various uncertainties of measurement that arise in obtaining such values ​​from among those that are inherently different, and should be understood in all instances to be modified by the term "about." Also, when numerical ranges are disclosed herein, such ranges are continuous and include every value from the minimum value to the maximum value, inclusive, unless otherwise indicated. Thus, when such a range refers to integers, it includes every integer from the minimum value to the maximum value, inclusive, unless otherwise indicated.

[0028] When a range is recited herein for a variable, the variable should be understood to include all values ​​within the stated range, including the recited endpoints of the range. For example, the range "5 to 10" will be understood to include not only the values ​​5, 6, 7, 8, 9, and 10, but also any subranges such as 6 to 10, 7 to 10, 6 to 9, and 7 to 9, as well as any value between the integers within the stated range, such as 5.5, 6.5, 7.5, 5.5 to 8.5, and 6.5 to 9. Also, for example, the range "10% to 30%" will be understood to include values ​​such as 10%, 11%, 12%, 13%, etc., and all integers up to and including 30%, as well as any subranges such as 10% to 15%, 12% to 18%, 20% to 30%, and any value between the integers within the stated range, such as 10.5%, 15.5%, 25.5%, etc.

[0029] In order to improve the ion elution of conventional fuel cell cooling hoses, it is possible to remove the metal oxide-type base resin and chemical additives from the rubber composition for the fuel cell cooling hose, but this results in problems such as the product not being molded properly or the physical properties being significantly reduced, making it impossible to satisfy the negative pressure resistance and durability performance required of the hose.

[0030] Therefore, the present inventors have conducted extensive research to solve the above problems and have found that optimizing the type and content of the base resin and the type and content of the reinforcing agent / activator not only effectively and economically suppresses ion elution but also ensures durability, thereby completing the present invention.

[0031] A rubber composition for a fuel cell cooling hose according to one embodiment of the present invention includes a base resin containing ethylene-propylene-diene copolymer (EPDM), a reinforcing agent, an activator, and a crosslinking agent. Preferably, the rubber composition includes 40 to 62 wt% of the base resin containing ethylene-propylene-diene copolymer (EPDM), 30 to 52 wt% of the reinforcing agent, 2 to 4 wt% of the activator, 2 to 3 wt% of the plasticizer, and 1 to 2 wt% of the crosslinking agent.

[0032] The base resin according to one embodiment of the present invention may include a resin that can minimize impurities such as catalysts that may be contained in the base resin during manufacturing, and preferably an ethylene-propylene-diene copolymer (EPDM).

[0033] The base resin according to one embodiment of the present invention may include at least one selected from the group consisting of metallocene EPDM and Ziegler-Natta EPDM to ensure component performance such as antifreeze resistance, heat resistance, and durability. The metallocene EPDM may be EPDM produced using a metallocene catalyst, and the Ziegler-Natta EPDM may be EPDM produced using a Ziegler-Natta catalyst. Preferably, the base resin may contain only metallocene EPDM, or may contain the metallocene EPDM and Ziegler-Natta EPDM in a weight ratio of 1:0.3 to 2.5. The inclusion of metallocene EPDM in the base resin has the advantage of minimizing impurities contained therein. Furthermore, if the weight ratio of metallocene EPDM to Ziegler-Natta EPDM is less than 1:0.3, there is a drawback in that material costs increase excessively, and if it exceeds 1:2.5, there is a drawback in that metal impurities remaining in the Ziegler-Natta EPDM are generated as ions, which reduces stack performance.

[0034] The content of the base resin according to one embodiment of the present invention may be 40 to 62 wt% based on 100 wt% of the total rubber composition for a fuel cell cooling hose. If the content of the base resin is less than 40 wt%, the elasticity, which is a physical property inherent to the rubber product, decreases, thereby weakening durability. If the content of the base resin exceeds 62 wt%, the mechanical properties cannot be secured, which may result in deterioration of fatigue performance in the long term.

[0035] The reinforcing agent according to one embodiment of the present invention may be one that can ensure mechanical properties such as durability, electrical insulation resistance, and processability of a rubber for a cooling hose manufactured from a composition containing the reinforcing agent, for example, one or more selected from the group consisting of carbon black, silica, and calcium carbonate. Although the reinforcing agent is not limited to a specific component, it preferably includes carbon black that can ensure fatigue resistance and robustness.

[0036] The carbon black that may be included in the reinforcing agent according to one embodiment of the present invention may have a dibutyl phthalate (DBP) oil absorption of 40 to 150 mL / 100 g and an iodine absorption number (I2) of 10 to 50 mg / g. If the DBP oil absorption of the carbon black is less than 40 mL / 100 g, durability may be reduced due to internal heat generation. If it exceeds 150 mL / 100 g, molding defects may occur during extrusion molding of hose parts. Furthermore, if the iodine absorption number (I2) of the carbon black is less than 10 mg / g, the bond energy between the rubber and the carbon black may be weak, making it difficult to maintain elasticity. If it exceeds 50 mg / g, damage may occur due to interparticle aggregation, where the carbon black is not properly dispersed.

[0037] The content of the reinforcing agent according to one embodiment of the present invention may be 30 to 52 wt % based on 100 wt % of the total rubber composition for a fuel cell cooling hose. If the content of the reinforcing agent is less than 30 wt %, the viscosity of the composition containing the reinforcing agent is low, making it difficult to mold parts for rubber production, and the mechanical properties are not ensured, making it difficult to ensure durability. On the other hand, if the content of the reinforcing agent exceeds 52 wt %, unreacted reinforcing agent may increase the amount of ion elution.

[0038] The olefin-based thermoplastic elastomer (TPO) that may be included in the activator according to one embodiment of the present invention is EPDM / PP. Alloy , and EPDM / PE Alloy The resin may contain one or more selected from the group consisting of EPDM / PP, which has excellent compatibility with other materials. Alloy may include:

[0039] The olefin-based thermoplastic elastomer (Thermoplastic olefin; TPO) that may be included in the activator according to an embodiment of the present invention may include at least one selected from the group consisting of an EPDM / PP alloy and an EPDM / PE alloy, and preferably includes an EPDM / PP alloy having excellent material compatibility.

[0040] The olefin-based thermoplastic elastomer (TPO) has a specific gravity of 0.85 to 0.9 g / cm 3 The melt index (MI) may be 0.3 to 0.7 g / 10 min (190°C / 2.16 kg). The specific gravity of the olefin-based thermoplastic elastomer (TPO) may be 0.85 g / cm. 3 If it is less than 0.9 g / cm, there is a drawback in that the mixing efficiency decreases during blending. 3If the melt index (MI) of the olefin-based thermoplastic elastomer (TPO) exceeds 0.3 g / 10 min, the viscosity of the compound increases, preventing normal extrusion molding. If the melt index (MI) of the olefin-based thermoplastic elastomer (TPO) is less than 0.3 g / 10 min, the material is not dispersed properly, resulting in partial hardening and reduced durability. If the MI exceeds 0.7 g / 10 min, the load applied during product molding reduces production efficiency.

[0041] The weight ratio of zinc oxide (ZnO):olefin-based thermoplastic elastomer (TPO) that may be included in the activator according to one embodiment of the present invention may be 1:1 to 2. If the weight ratio is less than 1:1, there is a drawback in that the amount of ion elution increases, and if it exceeds 1:2, there is a drawback in that the crosslink density is high and the product cannot be extruded, resulting in reduced processability, and there are drawbacks in that the mechanical properties, particularly the burst strength, of the fuel cell cooling hose manufactured therefrom are reduced.

[0042] The activator according to one embodiment of the present invention may contain 0.5 to 1 wt % of zinc oxide (ZnO), 0.5 to 1 wt % of olefin-based thermoplastic elastomer (TPO), and 1 to 2 wt % of stearic acid, relative to 100 wt % of the total rubber composition for a fuel cell cooling hose.

[0043] If the zinc oxide content in the activator according to one embodiment of the present invention is less than 0.5 wt%, the crosslinking reaction with the compound accelerator does not proceed normally, resulting in reduced heat resistance. If it exceeds 1 wt%, the unreacted activator ionizes and disperses in the antifreeze, reducing fuel cell stack performance efficiency. Furthermore, if the olefin-based thermoplastic elastomer (TPO) content in the activator according to one embodiment of the present invention is less than 0.5 wt%, the product formability is poor, resulting in poor appearance. If it exceeds 1 wt%, the product becomes partially hard, resulting in reduced hose fatigue performance. Furthermore, if the stearic acid content in the activator according to one embodiment of the present invention is less than 1 wt%, the crosslinking reaction does not proceed normally, resulting in reduced mechanical properties. If it exceeds 2 wt%, the remaining metal-based activator ionizes, reducing product performance.

[0044] The plasticizer according to one embodiment of the present invention may be one that can ensure manufacturing performance such as extrudability for manufacturing a fuel cell cooling hose from a composition containing the plasticizer, and may include, for example, one or more selected from the group consisting of paraffin oil, naphthalene oil, and aromatic oil. The plasticizer is not limited to one containing a specific component, but preferably includes paraffin oil, which has a similar solubility index and is highly efficient.

[0045] The content of the plasticizer according to one embodiment of the present invention may be 2 to 3 wt% based on 100 wt% of the total rubber composition for a fuel cell cooling hose. If the content of the plasticizer is less than 2 wt%, the viscosity increases significantly during rubber compounding, making extrusion molding impossible. If the content of the plasticizer exceeds 3 wt%, the mechanical properties decrease, resulting in reduced durability.

[0046] The crosslinking agent according to one embodiment of the present invention can be crosslinked during the composition preparation process of the present invention to produce a rubber for fuel cells while suppressing the amount of ion elution. For example, the crosslinking agent may be a peroxide-based crosslinking agent, which may include at least one selected from the group consisting of dicumyl peroxide (DCP), butyl peroxybenzoate, and butylperoxyhexane. Although not limited to a specific type, dicumyl peroxide (DCP), which has high vulcanization efficiency, may be preferably used.

[0047] The content of the crosslinking agent according to one embodiment of the present invention may be 1 to 2 wt% based on 100 wt% of the total rubber composition for a fuel cell cooling hose. If the content of the crosslinking agent is less than 1 wt%, it is difficult to ensure a crosslink density sufficient to ensure mechanical properties, and if it exceeds 2 wt%, it is difficult to ensure a crosslinking time sufficient to reduce manufacturing performance. According to one embodiment of the present invention, the rubber composition for a fuel cell cooling hose may further include an antioxidant capable of preventing changes in physical properties due to heat generated from a vehicle. The antioxidant according to one embodiment of the present invention may include at least one selected from the group consisting of 3D (N'-isopropyl-N-phenyl-phenyldiamine) and a phenolic antioxidant (2,6-di-tert-butyl-4-methylphenol). While not limited to antioxidants containing specific components, the antioxidant preferably includes 3D (N'-isopropyl-N-phenyl-phenyldiamine), which has excellent compound compatibility.

[0048] The content of the antioxidant according to one embodiment of the present invention may be 1 to 2 wt% based on 100 wt% of the total rubber composition for a fuel cell cooling hose. If the content of the antioxidant is less than 1 wt%, there is a drawback in that the heat resistance becomes weak due to a decrease in the performance of the antioxidant, and if it exceeds 2 wt%, there is a drawback in that scorch occurs in the rubber part. That is, the rubber composition for a fuel cell cooling hose according to one embodiment of the present invention contains the above components in specific content ranges, so that it can be produced using low-cost raw materials, and also, since the fuel cell cooling hose is produced using the composition by an extrusion method, it is economical.

[0049] Furthermore, a fuel cell cooling hose according to one embodiment of the present invention is manufactured by crosslinking the rubber composition for a fuel cell cooling hose. In other words, a fuel cell cooling hose manufactured using the rubber composition for a cooling hose according to one embodiment of the present invention can ensure durability such as negative pressure resistance and burst pressure, and can also effectively suppress ion elution, resulting in an ion elution rate of only 0.7 to 7.0 μS / cm, which has the advantage of extending the life of the fuel cell and ensuring the performance of the fuel cell.

[0050] The present invention will be described in more detail below with reference to examples. The following examples are merely illustrative examples to aid in understanding the present invention, and are not intended to limit the scope of the present invention.

[0051] Examples 1 to 5 and Comparative Example 10: Production of fuel cell cooling hose Test specimens were prepared by blending the ingredients according to the composition in Table 1 below. Specifically, the base resin was masticated for 3 minutes using a kneader. Then, the masticated base resin was mixed with the reinforcing agent, activator, plasticizer, and antioxidant, and kneaded for 3-4 minutes, followed by cleaning for 1-2 minutes to prepare the final CMB (Carbon Master Batch). The CMB (Carbon Master Batch) components were then mixed with a crosslinking agent in a roll mixer and processed. Next, the appropriate vulcanization time of the rubber composition prepared in this way was measured using a rheometer, and the vulcanization time was measured using a hot press at 160 kgf / cm. 2 Test specimens were prepared by heating and pressing at 100°C.

[0052] [Table 1]

[0053] Physical property evaluation method -Hardness: Measured using a dumbbell No. 3 according to KS M 6784 - Tensile strength and elongation: measured using dumbbell No. 3 according to KS M 6782 -Ion elution: Measured using MS263-19, ion elution evaluation method - Burst strength: Measured according to MS263-19 burst evaluation method

[0054] Experimental example: Comparison of physical properties and ion elution of fuel cell cooling hoses Fuel cell cooling hoses were manufactured as in Examples 1 to 5 and Comparative Examples 1 to 10, and the physical properties and ion elution properties of the fuel cell cooling hoses were measured using the evaluation methods described above. The results are shown in Table 2 below.

[0055] [Table 2]

[0056] Referring to Tables 1 and 2, Example 1, which contains only metallocene EPDM in the range of 40 to 62 wt%, exhibits the lowest ion elution and excellent mechanical properties such as hardness, tensile strength, elongation, and product burst strength. Examples 2 and 3, which contain metallocene EPDM and Ziegler-Natta EPDM in a weight ratio of 1:0.3 to 2.5, also exhibit excellent mechanical properties while reducing ion elution. Example 5, which contains a high crosslinker content of 2 wt%, also exhibits excellent mechanical properties while reducing ion elution. Meanwhile, Comparative Example 1, which uses a base resin containing only Ziegler-Natta EPDM, exhibits relatively high ion elution. Comparative Examples 2 and 3, which contain reinforcing material outside the range, exhibit high ion elution or poor product formability, resulting in poor manufacturability. In addition, Comparative Examples 4 and 6, which do not satisfy the 1:1-2 weight ratio of zinc oxide (ZnO) to olefin-based thermoplastic elastomer (TPO) in the activator, exhibited poor product moldability and poor manufacturability, or high ion elution. In Comparative Example 5, which satisfied the 1:1-2 weight ratio of zinc oxide (ZnO) to olefin-based thermoplastic elastomer (TPO) in the activator but exceeded the 1:1-2 content, the product burst strength was low, indicating poor mechanical properties. In Comparative Examples 7 and 8, which contained only a sulfide-based crosslinking agent or a mixture of a sulfide-based crosslinking agent and a peroxide-based crosslinking agent, the crosslinkers exhibited high ion elution or poor product moldability and poor manufacturability. In Comparative Examples 9 and 10, which contained plasticizers outside the range, the product moldability and poor manufacturability were poor, or high ion elution.

[0057] In other words, the rubber composition for a cooling hose according to one embodiment of the present invention can be manufactured using low-cost raw materials, such as silicone rubber, without using expensive raw materials, and the fuel cell cooling hose can be manufactured using the composition through an extrusion method rather than through costly methods such as a cloth-wrapping process, ensuring economic efficiency. Furthermore, a fuel cell cooling hose manufactured using the rubber composition for a cooling hose not only ensures durability in terms of negative pressure resistance and burst pressure, but also effectively suppresses ion elution, thereby extending the life of the fuel cell and ensuring fuel cell performance.

Claims

1. 40 to 62 wt. % of a base resin comprising a metallocene-based ethylene-propylene-diene monomer (EPDM); 30-52 wt. % of reinforcing agent; Activator 2-4% by weight; 2-3% by weight of a plasticizer; and A rubber composition for a fuel cell cooling hose, comprising 1 to 2% by weight of a crosslinking agent, The activator includes zinc oxide (ZnO), an olefin-based thermoplastic elastomer (TPO), and stearic acid; The weight ratio of the zinc oxide (ZnO):olefin-based thermoplastic elastomer (TPO) is 1:1 to 2; The crosslinking agent includes a peroxide-based crosslinking agent and does not include a sulfide-based crosslinking agent. A rubber composition for a fuel cell cooling hose.

2. The base resin is 2. The rubber composition for a fuel cell cooling hose according to claim 1, which contains only the metallocene EPDM, or contains the metallocene EPDM and Ziegler-Natta EPDM in a weight ratio of 1:0.3 to 2.

5.

3. 2. The rubber composition for a fuel cell cooling hose according to claim 1, wherein the reinforcing agent comprises at least one selected from the group consisting of carbon black, silica, and calcium carbonate.

4. 4. The rubber composition for a fuel cell cooling hose according to claim 3, wherein the carbon black has a dibutyl phthalate (DBP) oil absorption of 40 to 150 mL / 100 g and an iodine absorption number I2 of 10 to 50 mg / g.

5. The olefin-based thermoplastic elastomer (TPO) has a specific gravity of 0.85 to 0.9 g / cm ３ 2. The rubber composition for a fuel cell cooling hose according to claim 1, wherein the rubber composition has a melt index (MI) of 0.3 to 0.7 g / 10 min (190° C. / 2.16 kg).

6. 2. The rubber composition for a fuel cell cooling hose according to claim 1, wherein the plasticizer comprises at least one selected from the group consisting of paraffin oil, naphthalene oil, and aromatic oil.

7. 2. The rubber composition for a fuel cell cooling hose according to claim 1, wherein the peroxide-based crosslinking agent comprises at least one selected from the group consisting of dicumyl peroxide (DCP), butyl peroxybenzoate, and butylperoxyhexane.

8. 2. The rubber composition for a fuel cell cooling hose according to claim 1, further comprising 1 to 2% by weight of an antioxidant.

9. A fuel cell cooling hose produced by crosslinking the rubber composition for a fuel cell cooling hose according to claim 1, wherein the ion elution property is 0.7 to 7.0 μS / cm.

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