JP3556531B2 - Thermoplastic elastomer composition and gas hose using the same - Google Patents

Description

【００４７】
【表２】

【００４８】
表１及び表２に示すように、比較例１〜比較例９の熱可塑性エラストマー組成物は、引張物性が悪い、永久歪み試験やオゾン劣化試験で破断を起こしやすい、ガス低透過性及び耐油性に劣る、永久伸びが大き過ぎる、あるいは／および硬度が硬すぎる等の問題点があった。これらに対して実施例１〜３の熱可塑性エラストマー組成物は、各評価項目において良好な結果となっている。これらの評価より、本発明の優位性が確認された。
【００４９】
以上、ガスホースに用いられる場合が一例とされて本発明の熱可塑性エラストマー組成物が詳説されたが、優れた特性を備えた本発明の熱可塑性エラストマー組成物は、ガスホースのみならず、種々の用途に用いられ得る。
【００５０】
【発明の効果】
以上説明したように、本発明の熱可塑性エラストマー組成物は耐油性とガス低透過性とに優れ、また、加熱によって溶融するものである。この熱可塑性エラストマー組成物がガスホースに用いられることにより、ガスホースがリサイクルされ得る。
【図面の簡単な説明】
【図１】図１は、本発明の一実施形態にかかるガスホースが示された斜視図である。
【図２】図２は、図１のII−II線に沿った断面図である。
【図３】図３は、本発明の他の実施形態にかかるガスホースが示された断面図である。
【符号の説明】
１、５・・・・ガスホース
２、６・・・・外層
３、９・・・・補強ワイヤー層
４、１０・・・内層
７・・・・・・補強繊維層
８・・・・・・中間層[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a thermoplastic elastomer composition suitably used for, for example, a gas hose or the like, and particularly to a thermoplastic elastomer composition containing a thermoplastic polymer and rubber and dynamically crosslinked by a resin crosslinking agent. It is.
[0002]
[Prior art]
As a gas hose, a gas hose in which an inner layer, a reinforcing wire layer, and an outer layer are sequentially laminated from inside to outside is known. For the inner layer, NBR (acrylonitrile-butadiene copolymer) having excellent oil resistance and low gas permeability is used. By using NBR, gas leakage from the gas hose is suppressed. Also, polyvinyl chloride may be mixed with NBR for the purpose of improving the ozone resistance of the inner layer. On the other hand, a thermoplastic resin having excellent strength is often used for the outer layer.
[0003]
Since the gas hose is replaced after a certain period of use, a large amount of used gas hose is generated. As described above, the outer layer of this gas hose is made of a thermoplastic resin and is melted by heating. However, the inner layer is made of rubber and does not melt even when heated. For this reason, the used gas hose is hardly reused as a raw material polymer and is actually disposed of.
[0004]
As another gas hose, there is also known a gas hose in which an inner layer, a reinforcing wire layer, an intermediate layer, a reinforcing fiber layer, and an outer layer are sequentially laminated from inside to outside. In this gas hose, a mixture of NBR and polyvinyl chloride is used for the inner layer and the intermediate layer. This gas hose cannot be reused as a raw material polymer because the inner layer and the intermediate layer are not melted by heating, and are discarded after use.
[0005]
[Problems to be solved by the invention]
However, if the gas hose is discarded, it will not be decomposed by microorganisms and will remain in the environment, causing environmental destruction. Further, even when incinerated, halogens such as chlorine may cause harmful substances such as dioxins, and may also cause environmental destruction. Today, there is an increasing trend to save resources and protect the global environment, and there is a demand for the development of reusable gas hoses.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a gas hose that is excellent in oil resistance and low gas permeability and that can be reused. Another object of the present invention is to provide a thermoplastic elastomer composition suitable for the gas hose and the like.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, as a first invention,
A thermoplastic elastomer composition comprising a thermoplastic polymer, a rubber, and a resin crosslinking agent, and dynamically crosslinked,
This thermoplastic polymer has an olefin resin as a main component,
The rubber contains NBR and EPDM, the weight ratio of which is 75/25 or more and 99/1 or less, and liquid NBR is used as the NBR together with solid NBR.
The weight ratio between the thermoplastic polymer and the rubber is 20/80 or more and 50/50 or less,
The present invention provides a thermoplastic elastomer composition, wherein the compounding amount of the resin crosslinking agent is 1 part by weight or more and 20 parts by weight or less based on 100 parts by weight of rubber .
[0008]
This thermoplastic elastomer composition is obtained by dynamic crosslinking. In dynamic crosslinking, a rubber is crosslinked by heating while kneading a thermoplastic polymer, rubber, a crosslinking agent and other various additives. Then, the crosslinked rubber is dispersed as fine particles in the thermoplastic polymer. This thermoplastic elastomer composition has both the properties of the thermoplastic polymer serving as the matrix and the properties of the dispersion crosslinked rubber. Since the molded article obtained from the thermoplastic elastomer composition is melted by being heated, it can be reused. Further, since the thermoplastic elastomer composition uses NBR, it is excellent in oil resistance and low gas permeability. Furthermore, since this thermoplastic elastomer composition uses EPDM (ethylene-propylene-diene copolymer), it is excellent in ozone resistance, strength, and the like.
[0009]
In the present invention, if a hydrogenated styrene-based thermoplastic elastomer or a thermoplastic polyester elastomer is used as the thermoplastic polymer together with the olefin-based resin, the flexibility of the thermoplastic elastomer composition is improved.
[0010]
In the present invention, since the liquid NBR is used as the NBR together with the solid NBR, the flexibility of the thermoplastic elastomer composition is improved, and the other physical properties of the thermoplastic elastomer composition are almost maintained.
[0011]
In the present invention, the EPB used is preferably an ENB-based EPDM having an iodine value of 12 or more and 36 or less. This EPDM is liable to cause a co-crosslinking reaction with NBR.
[0012]
Further, the present invention provides, as a second invention, a thermoplastic elastomer composition which is suitably used as a gas hose by specifying various components. The thermoplastic elastomer composition,
A thermoplastic elastomer composition comprising a thermoplastic polymer, a rubber, and a resin crosslinking agent, and dynamically crosslinked,
This thermoplastic polymer contains a hydrogenated styrene-based thermoplastic elastomer as well as an olefin-based resin as a main component,
This rubber contains NBR and EPDM, and the weight ratio is 75/25 or more and 99/1 or less,
The weight ratio between the thermoplastic polymer and the rubber is 20/80 or more and 50/50 or less,
The thermoplastic elastomer composition comprises a resin crosslinking agent in an amount of 1 part by weight or more and 20 parts by weight or less based on 100 parts by weight of rubber.
Further, the present invention provides, as a third invention, a gas hose made of the above thermoplastic elastomer. The gas hose includes a thermoplastic polymer, a rubber, and a resin crosslinking agent, and includes a layer made of a thermoplastic elastomer composition that is dynamically crosslinked ,
The thermoplastic polymer of the thermoplastic elastomer composition forming the layer has an olefin-based resin as a main component, and the rubber contains NBR and EPDM, and the weight ratio is 75/25 or more and 99/1 or less. The weight ratio of the thermoplastic polymer to the rubber is 20/80 or more and 50/50 or less, and the compounding amount of the resin crosslinking agent is 1 to 20 parts by weight based on 100 parts by weight of the rubber. I do.
Such a thermoplastic elastomer composition is suitable for a gas hose that requires oil resistance, low gas permeability, weather resistance (ozone resistance), strength, flexibility, and the like.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a perspective view showing a gas hose 1 according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. The gas hose 1 includes an outer layer 2, a reinforcing wire layer 3, and an inner layer 4. The outer diameter of the gas hose 1 is generally about 10 mm to 20 mm. The inner diameter of the gas hose 1 is generally about 6 mm to 8 mm.
[0014]
The outer layer 2 is made of a thermoplastic resin. Examples of the thermoplastic resin used include polyvinyl chloride, polyurethane, and polyester. Among them, polyvinyl chloride excellent in oil resistance, strength and the like is suitably used. The thickness of the outer layer 2 is not particularly limited, but is usually about 2 mm. The outer layer 2 suppresses the gas hose 1 from being pierced or damaged.
[0015]
The reinforcing wire layer 3 is composed of a wire. The wire is usually provided so as to extend in two different directions, and each direction is oblique to the longitudinal direction of the gas hose 1. Examples of the material of the wire used include steel and the like. The strength of the gas hose 1 is increased by the reinforcing wire layer 3.
[0016]
The inner layer 4 is made of a thermoplastic elastomer composition. Since the thermoplastic elastomer composition is melted by heating, when the used gas hose 1 is heated, the inner layer 4 is melted together with the outer layer 2 and separated from the wire. Therefore, the polymer component and the wire are separately collected and reused or discarded. The thickness of the inner layer 4 is not particularly limited, but is usually about 1 mm to 2 mm.
[0017]
The thermoplastic elastomer composition of the inner layer 4 is obtained by dynamic crosslinking, and is obtained by dispersing crosslinked rubber particles in a thermoplastic polymer matrix. Therefore, this thermoplastic elastomer composition has both the properties of a thermoplastic polymer and the properties of a rubber.
[0018]
The thermoplastic polymer is mainly composed of an olefin resin. Since the olefin-based resin has a saturated molecular chain and is not cross-linked by a resin cross-linking agent during dynamic cross-linking, the composition after dynamic cross-linking is plasticized. Further, since the olefin-based resin has a relatively low plasticization temperature, the temperature at the time of dynamic crosslinking is low, and thermal deterioration of the rubber is suppressed. Furthermore, since the olefin resin is generally cheap and easily available, the production cost of the gas hose 1 is suppressed. Examples of the olefin resin used include, for example, polyethylene, polypropylene, ionomer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and the like, and these may be used alone or as a mixture of two or more. .
[0019]
In the matrix of the thermoplastic elastomer composition, another thermoplastic polymer may be used together with the olefin-based resin for the purpose of improving flexibility and the like. Other suitable thermoplastic polymers include hydrogenated styrenic thermoplastic elastomers. The hydrogenated styrene-based thermoplastic elastomer is mainly composed of a block copolymer composed of a polystyrene end block as a hard component and a rubber intermediate block as a soft component, and the intermediate block is hydrogenated. . Since the double bond has disappeared by hydrogenation, the resin is not crosslinked by a resin crosslinking agent during dynamic crosslinking. Specific examples of the hydrogenated styrene-based thermoplastic elastomer include a styrene-ethylene / propylene-styrene copolymer and a styrene-ethylene / butylene-styrene copolymer. Still another thermoplastic polymer is a thermoplastic polyester elastomer having an aromatic polyester as a hard component and an aliphatic polyether copolymer or an aliphatic polyester copolymer as a soft component.
[0020]
When another thermoplastic polymer (hydrogenated styrene-based thermoplastic elastomer or thermoplastic polyester elastomer) is used in combination with the olefin-based resin, the mixing ratio of both is preferably 1/9 or more and 5/5 or less, preferably 1/9 or less. It is particularly preferred that the ratio be at least / 9 and at most 3/7. If the blending ratio is less than the above range, the effect of blending another thermoplastic polymer is not exhibited, and the flexibility of the gas hose 1 may be insufficient. When the compounding ratio exceeds the above range, the performance of other thermoplastic polymers is greatly affected, and for example, low gas permeability may be deteriorated.
[0021]
Crosslinked rubber particles are dispersed in the thermoplastic elastomer composition of the inner layer 4 as described above, and NBR and EPDM are used as the rubber. NBR is a polymer having a large polarity, while an olefin-based resin is a polymer having a small polarity. When NBR and EPDM are used in combination, they cause co-crosslinking and uniform dispersion in the matrix. NBR is a rubber having excellent oil resistance and low gas permeability, while EPDM is a rubber having excellent ozone resistance and strength. A thermoplastic elastomer composition using both of them has both properties.
[0022]
As the NBR to be used, solid NBR having an acrylonitrile content of about 15 to 55% by weight and a number average molecular weight of about 50,000 to 200,000 is preferable. Further, with this solid NBR, a number average molecular weight of Ru et employed 10,000 about liquid NBR 3000. By mixing the liquid NBR, the flexibility of the gas hose 1 is improved. Since liquid NBR is a rubber equivalent to solid NBR except that it has a small molecular weight, even if it is blended, it does not greatly affect other performances of the gas hose 1.
[0023]
When liquid NBR is used together with solid NBR, the weight ratio of the two is preferably 5/95 or more and 30/70 or less, particularly preferably 10/90 or more and 25/75 or less. When the compounding ratio is less than the above range, the effect of compounding the liquid rubber is not exhibited, and the flexibility of the gas hose 1 may be insufficient. If the compounding ratio exceeds the above range, the tensile strength may decrease.
[0024]
As the EPDM to be used, an ENB-based EPDM whose iodine value is 12 or more and 36 or less is preferable. Thereby, co-crosslinking of EPDM and NBR becomes easy, and the dispersion of the rubber particles in the thermoplastic polymer becomes uniform as described above. In this respect, the iodine value of EPDM is particularly preferably 20 or more.
[0025]
The compounding weight ratio of NBR and EPDM is 75/25 or more and 99/1 or less, and particularly preferably 80/20 or more and 95/5 or less. If the compounding ratio is less than the above range, the oil resistance and low gas permeability of the gas hose 1 may be insufficient. If the compounding ratio exceeds the above range, the ozone resistance and strength of the gas hose 1 may be insufficient.
[0026]
Other rubbers may be added to the thermoplastic elastomer composition for the purpose of improving processability, improving strength, reducing costs, etc., as long as the properties of NBR and EPDM are not impaired. Examples of the rubber that can be blended include natural rubber, butadiene rubber, butyl rubber, isoprene rubber, styrene butadiene rubber, chloroprene rubber, acrylic rubber, chlorosulfonated polyethylene, and chlorinated polyethylene.
[0027]
In this thermoplastic elastomer composition, the blending weight ratio of the thermoplastic polymer to the rubber is 20/80 or more and 50/50 or less, and particularly preferably 30/70 or more and 40/60 or less. If the compounding ratio is less than the above range, plasticization of the thermoplastic elastomer composition may be difficult. If the compounding ratio exceeds the above range, the hardness and the permanent elongation of the gas hose 1 may increase.
[0028]
In this thermoplastic elastomer composition, the rubber particles are cross-linked by a resin cross-linking agent. Thereby, the strength of the gas hose 1 is improved as compared with the case where sulfur or the like is used as the crosslinking agent. Specific examples of the resin crosslinking agent include various phenolic resins synthesized by the reaction of phenols such as phenol, alkylphenol, cresol, xylenol, and resorcin with aldehydes such as formaldehyde, acetaldehyde, and furfural. In particular, alkylphenol-formaldehyde resin obtained by the reaction of formaldehyde with an alkylphenol having an alkyl group bonded to the ortho-position or para-position of benzene, and a halogenated or sulfonated product of this alkylphenol-formaldehyde resin are highly reactive and initiate crosslinking. This is preferable because the time becomes relatively short.
[0029]
The compounding amount of the resin crosslinking agent is 1 part by weight or more and 20 parts by weight or less, preferably 5 parts by weight or more and 15 parts by weight or less based on 100 parts by weight of rubber. When the compounding amount is less than the above range, the permanent elongation of the gas hose 1 is increased due to insufficient crosslinking, and the ozone resistance and low gas permeability may be insufficient. If the compounding amount exceeds the above range, the tensile properties of the gas hose 1 may be reduced due to excessive crosslinking, and the ozone resistance may be insufficient.
[0030]
A crosslinking activator may be added to the thermoplastic elastomer composition. Suitable crosslinking activators include zinc oxide, zinc carbonate and metal halides, which may be used alone or in combination of two or more. Alkylbenzene sulfonic acid or a salt thereof is also suitable as a crosslinking activator. However, in order to prevent crosslinking inhibition, it is preferable that alkylbenzenesulfonic acid or a salt thereof is not used in combination with zinc oxide, zinc carbonate, or a metal halide.
[0031]
Additives such as a softener, a filler, and a deterioration inhibitor may be added to the thermoplastic elastomer composition in an appropriate amount as needed.
[0032]
FIG. 3 is a sectional view showing a gas hose 5 according to another embodiment of the present invention. The gas hose 5 includes an outer layer 6, a reinforcing fiber layer 7, an intermediate layer 8, a reinforcing wire layer 9, and an inner layer 10. The outer diameter of the gas hose 5 is generally about 10 mm to 20 mm. The inner diameter of the gas hose 5 is generally about 6 mm to 8 mm.
[0033]
The configuration of the outer layer 6, the reinforcing wire layer 9, and the inner layer 10 is the same as the configuration of the outer layer 2, the reinforcing wire layer 3, and the inner layer 4 of the gas hose 1 shown in FIGS. The material of the intermediate layer 8 is the same as that of the inner layer 4 of the gas hose 1 shown in FIGS. The reinforcing fiber layer 7 is made of, for example, rayon fiber.
[0034]
When the gas hose 5 is heated after use, the outer layer 6, the intermediate layer 8 and the inner layer 10 melt and separate from the reinforcing fiber layer 7 and the reinforcing wire layer 9. Therefore, the polymer component and the wires and fibers can be collected separately.
[0035]
Delete
[ Examples 1 to 3]
Examples 1 to 3 are examples of the thermoplastic elastomer according to claim 1.
In Example 1, 48 parts by weight of solid NBR (trade name of NIPOL 1032) and liquid NBR (trade name of Nippon Zeon Co., Ltd. ) were placed in a twin-screw single-screw extruder (trade name “2TR-75” of Moriyama Co., Ltd.). 13 parts by weight of “NIPOL DN1312”) and 6 parts by weight of EPDM (trade name of “Esprene 586” of Sumitomo Chemical Co., Ltd.) were put into pellets having a diameter of about 4 mm and a length of about 4 mm. The pellets, 33 parts by weight of polyethylene (Sumikasen α GZ802, trade name of Sumitomo Chemical Co., Ltd.) and 3 parts by weight of zinc oxide (Mitsui Metal Mining Co., Ltd.) are mixed in a tumbler, and then mixed with a twin-screw extruder (IPEC). (HTM38)). At the same time, 8 parts by weight (12 parts by weight based on 100 parts by weight of rubber) of a resin cross-linking agent (trade name of "Takkiroll 250-3" by Taoka Chemical Co., Ltd.) were continuously added. This was extruded into a strand having a diameter of about 4 mm, cut into a length of about 4 mm after cooling, and further introduced into a single-screw extruder (Kasamatsu Chemical Industry Laboratory, φ50 extruder). Then, a sheet having a width of about 120 mm and a thickness of about 2 mm was extruded and cooled to obtain a thermoplastic elastomer composition of Example 1. Then, test pieces for each evaluation described later were prepared from the thermoplastic elastomer composition. In addition, the test piece for measuring a gas permeability coefficient was obtained by first slicing a thermoplastic elastomer composition into a 100 mm square, and then slicing both sides so that the thickness became 1 mm.
[0037]
Delete
Delete [0039]
[Example 2 ]
Except that the blending amount of polyethylene was 23 parts by weight and 10 parts by weight of a styrene-ethylene / propylene-styrene copolymer (SEPS, trade name “Septon 2063” of Kuraray Co., Ltd.), which is a hydrogenated styrene-based thermoplastic elastomer, was blended. In the same manner as in Example 1 , a thermoplastic elastomer composition of Example 2 was obtained.
[0040]
[Example 3]
The thermoplastic elastomer composition of Example 3 was prepared in the same manner as in Example 2 except that 10 parts by weight of a thermoplastic polyester elastomer (TPEE, trade name “Perprene P-30B” of Toyobo Co., Ltd.) was used instead of SEPS. Obtained.
[0041]
[Comparative Examples 1 to 9]
The components were as shown in Tables 1 and 2.
In the table, sulfur is powder sulfur of Tsurumi Chemical Co., Ltd., vulcanization accelerator is Ouchi Shinko Chemical Co., Ltd. product name “Noxeller CZ” and trade name “Noxeller TET”, and polyamide is Toyobo Co., Ltd. product name “T802”. Was.
Solid NBR, liquid NBR, EPDM, and polyethylene were the same as those in the examples, and thermoplastic elastomers were prepared by the same method as in the examples.
[0042]
Delete
Delete [0044]
Delete [0045]
[Measurement of hardness]
In accordance with JIS-K6253, the hardness of each thermoplastic elastomer composition was measured with a D-type spring hardness tester. The results are shown in Tables 1 and 2 below.
[Tensile test]
Each thermoplastic elastomer composition was subjected to a tensile test based on JIS-K6251. Then, the elongation at break Eb and the tensile strength Tb were measured. The shape of the test piece was a dumbbell-shaped No. 3. The results are shown in Tables 1 and 2 below. When this thermoplastic elastomer composition is used as a gas hose, Eb is preferably at least 200%, and Tb is preferably at least 10 MPa.
[Measurement of permanent elongation]
In accordance with JIS-K6262, the permanent elongation Ps of each thermoplastic elastomer composition at 100% elongation was measured. The results are shown in Tables 1 and 2 below. When this thermoplastic elastomer composition is used as a gas hose, Ps is preferably 20% or less.
[Ozone deterioration test]
Each thermoplastic elastomer composition was subjected to an ozone deterioration test based on JIS-K6259 to evaluate ozone resistance. Specifically, the dumbbell-shaped No. 1 test piece was given a 30% elongation, allowed to stand in an environment of an ozone concentration of 50 pph and a temperature of 40 ° C. for 144 hours, and visually checked for the occurrence of cracks. A sample in which no cracks occurred was marked with “○”, and a sample in which cracks occurred was marked with “x”. The results are shown in Tables 1 and 2 below.
[Measurement of gas permeability coefficient]
Using liquefied propane gas based on JIS-K6347, the gas permeability coefficient of each thermoplastic elastomer composition was measured based on ASTM-D1434. The results are shown in Tables 1 and 2 below. When this thermoplastic elastomer composition is used as a gas hose, the gas permeability coefficient is preferably 2000 or less.
[Immersion test]
Each thermoplastic elastomer composition was subjected to an immersion test according to JIS-K6258. Specifically, JIS No. 3 oil was used as the liquid, and the weight change after 168 hours at 40 ° C. was measured. In addition, using isooctane (2,2,4-trimethylpentane) as the liquid, the weight change after 168 hours at 23 ° C. was measured. The results are shown in Tables 1 and 2 below. When this thermoplastic elastomer composition is used as a gas hose, the rate of weight change is preferably 10% or less.
[0046]
[Table 1]

[0047]
[Table 2]

[0048]
As shown in Tables 1 and 2, the thermoplastic elastomer compositions of Comparative Examples 1 to 9 have poor tensile properties, easily break in a permanent set test or an ozone deterioration test, low gas permeability and oil resistance. Inferior in elongation, permanent elongation is too large, and / or hardness is too hard. On the other hand, the thermoplastic elastomer compositions of Examples 1 to 3 have good results in each evaluation item. From these evaluations, the superiority of the present invention was confirmed.
[0049]
As described above, the thermoplastic elastomer composition of the present invention has been described in detail by taking as an example the case where the thermoplastic elastomer composition is used for a gas hose, but the thermoplastic elastomer composition of the present invention having excellent properties can be used not only for a gas hose but also for various applications. Can be used.
[0050]
【The invention's effect】
As explained above, the thermoplastic elastomer composition of the present invention is excellent in oil resistance and low gas permeability, and melts by heating. By using this thermoplastic elastomer composition for a gas hose, the gas hose can be recycled.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a gas hose according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a cross-sectional view illustrating a gas hose according to another embodiment of the present invention.
[Explanation of symbols]
1, 5, ... gas hose 2, 6, ... outer layer 3, 9, ... reinforcing wire layer 4, 10, ... inner layer 7, ... reinforcing fiber layer 8, ... Middle class

Claims (6)

A thermoplastic elastomer composition comprising a thermoplastic polymer, a rubber, and a resin crosslinking agent, and dynamically crosslinked,
This thermoplastic polymer has an olefin resin as a main component,
This rubber contains NBR and EPDM, the weight ratio of which is 75/25 or more and 99/1 or less, and as the NBR, liquid NBR is used together with solid NBR,
The weight ratio of the thermoplastic polymer to the rubber is 20/80 or more and 50/50 or less,
A thermoplastic elastomer composition, wherein the amount of the resin crosslinking agent is 1 part by weight or more and 20 parts by weight or less based on 100 parts by weight of rubber. The thermoplastic elastomer composition according to claim 1, wherein the thermoplastic polymer further comprises a hydrogenated styrene-based thermoplastic elastomer or a thermoplastic polyester elastomer. The thermoplastic elastomer composition according to claim 1 or 2, wherein the EPDM is an ENB-based EPDM having an iodine value of 12 or more and 36 or less. A thermoplastic elastomer composition comprising a thermoplastic polymer, a rubber, and a resin crosslinking agent, and dynamically crosslinked,
This thermoplastic polymer contains a hydrogenated styrene-based thermoplastic elastomer as well as an olefin-based resin as a main component,
This rubber contains NBR and EPDM, and the weight ratio is 75/25 or more and 99/1 or less,
The weight ratio of the thermoplastic polymer to the rubber is 20/80 or more and 50/50 or less,
A thermoplastic elastomer composition, wherein the amount of the resin crosslinking agent is 1 part by weight or more and 20 parts by weight or less based on 100 parts by weight of rubber. A gas hose comprising a layer comprising the thermoplastic elastomer composition according to any one of claims 1 to 3. A thermoplastic polymer, rubber, and a resin cross-linking agent, comprising a layer of a thermoplastic elastomer composition that is dynamically cross-linked,
The thermoplastic polymer of the thermoplastic elastomer composition forming the layer has an olefin-based resin as a main component, the rubber contains NBR and EPDM, and the weight ratio is 75/25 or more and 99/1 or less. The weight ratio of the thermoplastic polymer to the rubber is 20/80 or more and 50/50 or less, and the compounding amount of the resin crosslinking agent is 1 to 20 parts by weight based on 100 parts by weight of the rubber. Gas hose.

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