JP3438485B2 - Hose production method and rubber composition for hose used therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to the fluorine-based rubber, or fluorine-based and the layer made of resin, manufacturing method and rubber composition for a hose used therefor the hose obtained by direct vulcanization bonding a layer consisting of epichlorohydrin rubber It is about.

[0002]

2. Description of the Related Art Conventionally, when a layer made of fluororubber or fluororesin and a layer made of epichlorohydrin rubber are adhered, 1,8-diazabicyclo [5] is used as a material for forming the layer made of epichlorohydrin rubber. ．
4.0] Undecene-7 or a weak acid salt thereof, tetrabutylphosphonium benzotriazolate which is one of onium salts, and a rubber composition containing a predetermined amount of calcium hydroxide or the like are used to vulcanize the above two layers. The bonding method is generally used. In this case, as the vulcanizing agent for the epichlorohydrin-based rubber, a vulcanizing system using a thiourea compound is used, and among them, ethylene thiourea (2-mercaptoimidazoline) and a vulcanizing agent using a lead compound as an acid acceptor are used together. The system is widely used.

[0003]

However, when the material for forming the layer made of epichlorohydrin rubber is used, the adhesiveness between the layer made of fluororubber or fluorine resin and the layer made of epichlorohydrin rubber is improved. Is inferior. Further, when the above ethylene thiourea (hereinafter abbreviated as "ETU") is used, the compression set is poor, and secondary vulcanization is required, and in addition, the sour gasoline resistance is inferior, and problems such as softening occur. There is. Further, there is a problem such as toxicity of the lead compound used as the acid acceptor.

Therefore, it is possible to use 2,4,6-trimercapto-S-triazine as an alternative vulcanizing system to the ETU vulcanizing system, but in this case, storage stability (scorch property) is obtained. In addition to being inferior, there is a problem that the adhesiveness to the layer made of fluororubber or fluororesin is poor as in the above case.

The present invention has been made in view of the above circumstances, and has a laminated structure in which a layer made of a fluororubber or a fluororesin and a layer made of epichlorohydrin rubber are easily and firmly adhered to each other. Can be prepared , and is obtained by the adhesion of the above two layers which are excellent in compression set, sour gasoline resistance and storage stability.
Providing manufacturing methods and rubber composition for a hose used therefor the hose and its object.

[0006]

In order to achieve the above-mentioned object, the present invention is directed to direct vulcanization and adhesion of a layer made of either fluororubber or fluororesin and a layer made of epichlorohydrin rubber. a manufacturing method of a hose formed by, as the material layer of the epichlorohydrin-based rubber, containing (a) ~ (E) component described below, and,
The blending ratio of the components (B) to (E) is 0.3 to 3 parts by weight of the component (B) and 0.01 to 100 parts by weight of the component (C) with respect to 100 parts by weight of the component (A). 0.3 part by weight, the component (D) is 0.1 parts by weight or more, the (E) manufacturing method of a hose components used rubber compositions respectively set to 0.1 to 5 parts by weight of the The summary is 1. (A) Epichlorohydrin type rubber. (B) Thiourea compound. (C) Sulfur. (D) Aromatic disulfide compound. (E) 1,8-diazabicyclo [5.4.0] undecene-7 or its weak acid salt.

The present invention also relates to a fluororubber and a foot.
Direct vulcanization adhesion to a layer consisting of either one of the base resin
A rubber composition for a hose , comprising the following (A) to (E):
In addition, the content of the components (B) to (E) is 0.3 to 3 parts by weight of the component (B) with respect to 100 parts by weight of the component (A). ) Component is 0.01 to
A second aspect of the rubber composition for a hose, wherein the amount of the component (D) is 0.1 part by weight or more and the amount of the component (E) is 0.1 to 5 parts by weight in 0.3 part by weight. And (A) Epichlorohydrin type rubber. (B) Thiourea compound. (C) Sulfur. (D) Aromatic disulfide compound. (E) 1,8-diazabicyclo [5.4.0] undecene-7 or its weak acid salt.

The present inventors have conducted extensive studies to solve the above problems. As a result, as the material for forming the layer composed of the epichlorohydrin-based rubber, the component (A)-
When a rubber composition in which the component (E) is blended in the above-mentioned specific proportion is used, a layer made of either one of the above-mentioned fluororubber or fluororesin and a layer made of epichlorohydrin-based rubber are adhered to each other. The inventors have found that a hose having a laminated structure can be produced by directly and easily directly adhering to the hose without using an agent, and thus reached the present invention. The above-mentioned two-layer bonding mechanism in this case is considered as follows. That is, at the interface between both compositions during adhesion in a heated state, a fluorine atom is released as hydrofluoric acid (HF) from the molecular skeletons of the fluororubber and the fluororesin, and the double bond in the molecular skeleton is accompanied by this detachment. To generate. Then, the hydrofluoric acid is
It reacts with the metal oxides, metal hydroxides, hydrotalcite compounds, etc. in the epichlorohydrin-based rubber pre-blended and is trapped and stabilized. By this stabilizing action, the concentration of hydrofluoric acid in the fluororubber and the fluororesin is kept below a certain level, and the fluorine atoms are continuously desorbed from the molecular skeleton of the fluororubber and the fluororesin. , Double bond formation in the molecular skeleton also occurs continuously. The double bond formed in the fluorine-based rubber and the fluorine-based resin molecular skeleton is 1,8-diazabicyclo [5.4.0] undecene-7 or its weak acid salt [(( By the action of the component (E)], the epichlorohydrin-based rubber molecular skeleton is cross-linked, and as a result, a layer made of either one of the fluorine-based rubber and the fluorine-based resin,
It is presumed that this is because the layer made of epichlorohydrin rubber adheres to the layer. The present inventors have also found that when the above rubber composition is used, the compression set of the layer made of epichlorohydrin rubber is improved and secondary vulcanization is not necessary.

Then, the above two layers are directly added by using a rubber composition in which, in addition to the above-mentioned components (A) to (E), the above-mentioned hydrotalcite compound [component (F)] is blended in the above-mentioned specific ratio. If a hose is prepared by vulcanization bonding, while maintaining the adhesiveness of the two layers, the compression set of the layer made of epichlorohydrin rubber is further improved, and
It has been found that storage stability and sour gasoline resistance are improved, and since lead compounds are not used as an acid acceptor, problems such as toxicity due to lead compounds can be solved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail.

[0011] The present invention includes a layer comprising the one of fluorine-based rubber and a fluorine-based resin, a manufacturing method of a hose formed by direct vulcanization bonding a layer consisting of epichlorohydrin rubber, the epichlorohydrin rubber As a material for forming a layer consisting of the above, the above-mentioned epichlorohydrin-based rubber (component A), the above thiourea compound (component B), and sulfur (C
Component), an aromatic disulfide compound (D component),
1,8-diazabicyclo [5.4.0] undecene-7
Alternatively, a rubber composition containing a weak acid salt (E component) thereof is used.

The epichlorohydrin type rubber (component A) in the present invention is not particularly limited, and for example, epichlorohydrin homopolymer (CO), epichlorohydrin-allyl glycidyl ether binary copolymer (GCO), epichlorohydrin- Ethylene oxide binary copolymer (ECO), epichlorohydrin-ethylene oxide-allyl glycidyl ether terpolymer (G
ECO) or the like is used.

The thiourea compound (component B) used together with the above component A acts as a vulcanizing agent and is not particularly limited. For example, ethylene thiourea type, dialkyl thiourea type, trialkyl thiourea type compounds are used. And other thiourea compounds. Among them, 2-mercaptoimidazoline, 1,3-diethylthiourea, 1,3-dibutylthiourea, trimethylthiourea and the like are preferable.

The blending ratio of the thiourea compound (component B) is 100 parts of the epichlorohydrin rubber (component A).
It is necessary to set in the range of 0.3 to 3 parts with respect to parts by weight (hereinafter abbreviated as “parts”), and more preferably 0.
5 to 2 parts, particularly preferably 0.7 to 1.2 parts. That is, if the blending ratio of the component B is less than 0.3 part, the vulcanization rate is too slow to be practical and the compression set is deteriorated. On the contrary, if it exceeds 3 parts, the storage stability is deteriorated. Is not obtained, and the vulcanization rate is too fast to obtain practical rubber physical properties.

The blending ratio of the sulfur (component C) used together with the components A and B is 0.01 to 100 parts by weight of the epichlorohydrin rubber (component A).
It is necessary to set in the range of 0.3 part, and more preferably 0.05 to 0.15 part. That is, the above C
When the compounding ratio of the components is less than 0.01 part, improvement in compression set is not observed, and conversely, when it exceeds 0.3 part, compression set becomes poor and heat resistance also becomes poor. is there.

The aromatic disulfide compound (component D) used together with the above components A to C acts as a mastication accelerator and is not particularly limited, but for example, 2,2'-dibenzo. Examples thereof include amide diphenyl disulfide and zinc salt of 2-benzamido thiophenol.

The above aromatic disulfide compound (component D)
It is necessary to set the compounding ratio to 0.1 part or more, and more preferably 0.5 to 1.5 parts, relative to 100 parts of the epichlorohydrin-based rubber (component A). That is, if the mixing ratio of the component D is less than 0.1 part,
This is because compression set and storage stability deteriorate.

1,8-diazabicyclo [5.4.0] undecene-7 used together with the above components A to D
The weak acid salt (E component) of (hereinafter abbreviated as “DBU”) is not particularly limited, but a carboxylic acid salt of DBU and a phenolic salt of DBU are preferably used. The DBU carboxylic acid salt is preferably DBU naphthoate or sorbate. These may be used alone or in combination of two or more.

The mixing ratio of the E component is 0.1 to 100 parts of the epichlorohydrin rubber (A component).
It is necessary to set in the range of 5 parts, and more preferably 0.5 to 1.5 parts. That is, when the mixing ratio of the E component is less than 0.1 part, the adhesiveness between the layer made of the fluororubber or the fluororesin and the layer made of the epichlorohydrin rubber is poor, and conversely 5 This is because the compression set becomes worse when the content exceeds the range.

[0020] manufacturing method rubber composition used in the hose of the present invention, in addition to the above component A ~E component, it is possible to further blending hydrotalcite compound (F component) as appropriate. If a hose is produced by directly vulcanizing and adhering the two layers using a rubber composition containing the above-mentioned component F, the adhesiveness of the two layers will be further improved and the compression set of the layer made of epichlorohydrin-based rubber will be improved. Is further improved, and storage stability and sour gasoline resistance are also improved. Further, a lead vulcanization manufacturing method becomes possible, and since a lead compound is not used as an acid acceptor, problems such as toxicity due to the lead compound can be solved.

The above hydrotalcite compound (F component)
Is an acid acceptor, and is not particularly limited. For example, a typical composition formula MgAl
Those represented by ₂ (OH) ₁₆ CO ₃ .4H ₂ O are preferable, and specifically, DHT-4A manufactured by Kyowa Chemical Industry Co., Ltd. and the like are preferably used.

The above hydrotalcite compound (F component)
It is necessary to set the compounding ratio in the range of 1 to 10 parts, and more preferably 1.5 to 4.5 parts, per 100 parts of the epichlorohydrin-based rubber (component A). That is, if the blending ratio of the above-mentioned F component is less than 1 part, vulcanization cannot be carried out quickly, sour gasoline resistance is poor, and conversely, if it exceeds 10 parts, the compression set becomes worse. Because.

The rubber composition for a hose of the present invention includes the above A
In addition to the components (F) to (F), various additives can be appropriately added. Examples of such additives include plasticizers, antioxidants, processing aids, reinforcing agents, fillers, flame retardants and the like. These may be used alone or in combination of two or more.

Examples of the plasticizer include dioctyl phthalate (DOP) and other phthalates, dibutyl carbitol adipate and other adipates, and polyethers.

Examples of the antioxidant include nickel dibutyldithiocarbamate, 2-mercaptobenzimidazole and 2,2,4-trimethyl-1,2-dihydroquinone.

On the other hand, those in manufacturing method of the hose of the present invention, as the material for forming the layer made of a fluorine-based rubber as the adherend layer consisting of epichlorohydrin rubber (hereinafter referred to as "FKM"), which is particularly limited However, for example, a copolymer of vinylidene fluoride and ethylene trifluoride chloride, a copolymer of vinylidene fluoride and propylene hexafluoride, a vinylidene fluoride and propylene hexafluoride and tetrafluoroethylene Examples thereof include a terpolymer, a blend of polyvinylidene fluoride and acrylic rubber, and the like.

The molding material for the layer made of fluororesin, which is the object of adhesion of the layer made of epichlorohydrin rubber, is not particularly limited. For example, ethylene tetrafluoride, propylene hexafluoride and fluorine are used. Examples thereof include a terpolymer (THV) with vinylidene chloride, a copolymer of ethylene and tetrafluoroethylene, a copolymer of ethylene tetrafluoride and propylene hexafluoride, and the like.

[0028] Next, the manufacturing method of the hose of the present invention,
This will be specifically described.

First, a rubber composition which is a material for forming a layer made of epichlorohydrin type rubber is prepared by blending the above-mentioned components A to E, the optional component F, and various additives at a predetermined ratio and kneading them. can get. on the other hand,
A material for forming a layer made of FKM (or fluororesin) is prepared. Next, the rubber composition and the FKM (or fluororesin) forming material are extrusion molded by a coextrusion method.
Then, an unvulcanized hose having a two-layer structure is produced. Just
So, I decided to directly vulcanize this without using an adhesive.
Thus, a hose having a two-layer structure as shown in FIG. 1 is produced.
In the figure, 1 is made of FKM (or fluororesin)
Is a tubular inner layer, and 2 is made of epichlorohydrin rubber
Is a tubular outer layer. As the vulcanization conditions in this case,
Is preferably 150 to 170 ° C. × 20 to 90 minutes .

Next, examples will be described together with comparative examples.

First, prior to the Examples and Comparative Examples, each material (* 1 to 11) shown in Table 1 below was prepared.

[0032]

[Table 1]

[0033]

Examples 1 to 18 and Comparative Examples 1 to 8 The materials (* 1 to 11) shown in Table 1 above and the other materials shown in Tables 2 to 6 below were blended in the proportions shown in the same table. A rubber composition was prepared.

[0034]

[Table 2]

[0035]

[Table 3]

[0036]

[Table 4]

[0037]

[Table 5]

[0038]

[Table 6]

Using the rubber compositions of Examples and Comparative Examples thus obtained, comparative evaluation was carried out on storage stability, initial physical properties, compression set and sour gasoline resistance according to the following criteria. It was The results are also shown in Tables 7 to 11 below.

[Storage Stability (Scorch Property)] The storage stability was evaluated according to the method described in JIS K6300. That is, in the initial stage and after dry heat
72 hours) and after moist heat (50 ° C x 24 hours x 95% R)
For each of H), ML 121 ° C. (1 + 3) and scorch time (St. 5p) were measured.

[Initial physical properties] The initial physical properties are physical property values showing the initial performance of the vulcanized rubber after pressing the above rubber composition at 160 ° C. for 45 minutes.
It was measured according to the method described in SK 6301. Note that TB is tensile strength, EB is tensile elongation at break, and Hs is JI.
S A hardness is shown, respectively.

[Compression Set] According to the method described in JIS K 6301, the compression set when primary vulcanization (100 ° C. × 72 hours) was performed was measured. For the rubber composition of Comparative Example 1, 2
The compression set when the secondary vulcanization (150 ° C. × 2 hours) was performed was also measured.

[Sour Gasoline Resistance] The sour gasoline resistance was evaluated according to the method described in JIS K6301. That is, the above rubber composition was molded into a sheet and then vulcanized under the conditions of 160 ° C. for 45 minutes. Then, when measuring tensile strength, elongation, and hardness change, a dumbbell-shaped No. 3 test piece was punched out from this sheet-shaped vulcanized product, and Fuel B [isooctane / toluene added with 3 wt% of lauroyl peroxide (LPO) was added. = 70/30 (volume%)] and 72 at 40 ° C.
Left for hours. The liquid volume was 150 ml for three samples. When measuring the volume change rate, the width is 20 mm,
Test piece 3 with a length of 50 mm and a thickness of 2.00 ± 0.15 mm
Each piece was immersed in a liquid having a liquid volume of 100 ml. Further, in the table, ΔTB is the rate of change of tensile strength after immersion with respect to tensile strength under normal conditions, ΔEB is the rate of change of elongation at break after immersion with respect to elongation at break under normal conditions, and ΔHs is hardness under normal conditions of hardness after immersion. And ΔV represent the rate of change in volume after immersion. The appearance was also evaluated.

[0044]

[Table 7]

[0045]

[Table 8]

[0046]

[Table 9]

[0047]

[Table 10]

[0048]

[Table 11]

From the results of Tables 7 to 11 above, Examples 1 to 1 were obtained.
It can be seen that the 18 rubber compositions have a better balance of evaluation results of storage stability, initial physical properties, compression set and sour gazoline resistance than the rubber compositions of the comparative examples. Therefore, it is excellent for hose applications such as fuel hoses.
You can see that Among them, the rubber compositions of the products of Examples 10 to 18 further contain a hydrotalcite compound (F component) in a predetermined ratio in addition to the components A to E. It is also understood that the storage stability and the compression set are further improved than the above.

Next, a comparative evaluation was made on the adhesiveness between the rubber compositions of the above-mentioned example products and comparative example products and the binary FKM. The results are shown in Tables 12 to 16 below. The rubber composition of Example 10 was also comparatively evaluated for its adhesiveness with ternary FKM and adhesiveness with ternary THV.

[Binary FKM] A binary FKM having the following composition was used. Vinylidene fluoride-hexafluoropropene binary copolymer (Viton E430, manufactured by DuPont) 100 parts Carbon SRF 13 parts MgO # 150 3 parts Ca (OH) ₂ 6 parts

[Ternary FKM] Instead of Viton E430, a ternary copolymer of vinylidene fluoride, propylene hexafluoride and ethylene tetrafluoride (Dayer G555, manufactured by Daikin) was used. Other than that, the same composition as the binary FKM was used.

[Ternary THV] As the ternary THV, a tetrafluoroethylene-hexafluoropropene-vinylidene fluoride ternary copolymer (THV 500G, manufactured by 3M) was used.

The adhesiveness between the binary FKM (or the ternary FKM and the ternary THV) and the epichlorohydrin rubber is
Comparative evaluation was performed on the following peeling force and interface state in the initial case, after heat aging (120 ° C. × 72 hours) and after immersion (Fuel D, 40 ° C. × 48 hours).

[Peeling force] An FKM plate (or THV plate) having a thickness of 1.2 mm and an unvulcanized epichlorohydrin rubber plate having a thickness of 2.2 mm were bonded together and sandwiched in a mold having a thickness of 3 mm, and a surface pressure of 20 kg was applied.
After pressure vulcanization was performed under the conditions of f / cm ² and 160 ° C. × 45 minutes, the obtained vulcanized sheet was cut into strips with a width of 25 mm. Next, using a strograph, the strip-shaped vulcanized sheet was peeled off at a peeling speed of 50 mm / min from the FKM plate (or THV plate) and the unvulcanized epichlorohydrin rubber plate (kgf / 25 mm) was measured.

[Interfacial State] In the interfacial state, whether or not the FKM plate (or THV plate) and the unvulcanized epichlorohydrin rubber plate were adhered to each other was visually observed in the above peel strength test. And FK
In the peeling surface between the M plate (or THV plate) and the epichlorohydrin rubber plate, the state where the entire surface is rubber broken is "R break",
In the table, a state in which a part of the rubber was broken and the remaining part was interfacially separated was shown as "part R".

[0057]

[Table 12]

[0058]

[Table 13]

[0059]

[Table 14]

[0060]

[Table 15]

[0061]

[Table 16]

From the results of Tables 12 to 16 above, when the rubber compositions of the examples were used, the adhesiveness with the binary FKM (or the ternary FKM, etc.) was good, so that this rubber was used.
Using the composition, laminate with the FKM layer without using an adhesive to form a hose
An excellent hose that does not cause delamination when manufactured
It turns out that On the other hand, when the rubber composition of Comparative Example was used, the adhesiveness with the binary FKM was poor .
Therefore, when a hose is made by laminating with FKM without adhesive.
Then, it is understood that delamination is likely to occur .

[0063]

As is evident from the foregoing description, the present invention includes a layer made of either one of fluorine-based rubber and a fluorine-based resin, and directly adhered by vulcanization and a layer made of epichlorohydrin rubber
Comprising a manufacturing method of the hose, as the material for forming the layer made of the epichlorohydrin rubber, the epichlorohydrin rubber (A component), thiourea compound (B component),
Sulfur (component C), aromatic disulfide compound (component D)
A rubber composition containing DBU or its weak acid salt (E component) in a predetermined ratio is used. Therefore,
The layer made of the above-mentioned fluororubber or fluororesin and the layer made of epichlorohydrin-based rubber can be directly bonded easily and firmly without using an adhesive or the like. Further, when the above rubber composition is used, the compression set of the layer made of epichlorohydrin rubber is improved, and the secondary vulcanization becomes unnecessary.

A hose is prepared by directly vulcanizing and adhering the two layers by using a rubber composition in which the above-mentioned hydrotalcite compound (F component) is blended in the above-mentioned specific proportions in addition to the above-mentioned A-E components. if prepared, while maintaining adhesion of the two layers, with compression set of the layer consisting of epichlorohydrin rubber is further improved, even improved storage stability and sour gasoline resistance, yet as acid acceptor Since lead compounds are not used, problems such as toxicity due to lead compounds can be solved.

[0065] Accordingly, the present invention is, for example, can be applied to the molding method of the multi-layer hose of the fuel hose and air hose system and the like, particularly for air hose system, can be used the rubber composition as the inner surface rubber forming material is there. Furthermore, in the present invention, vulcanization and bonding can be directly performed without using an adhesive or the like, which is very advantageous in terms of manufacturing cost.

[Brief description of drawings]

1 is a configuration diagram of a hose with a two-layer structure obtained by manufacturing methods of the hose of the present invention.

[Explanation of symbols]

1 Tubular Inner Layer Made of Fluorine Rubber (or Fluorine Resin) 2 Tubular Outer Layer Made of Epichlorohydrin Rubber

Continuation of front page (51) Int.Cl. ⁷ identification code FI C08K 5/405 C08K 5/405 C08L 19/00 C08L 19/00 71/03 71/03 (56) Reference JP-A-55-29547 (JP , A) JP 54-157158 (JP, A) JP 53-69254 (JP, A) JP 2-191644 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB) Name) C09J 4/00-201/10 C08K 3/00-13/04 C08L 7/00-101/16 B32B 1/00-35/00

Claims (4)

(57) [Claims] 1. A fluorine-based rubber and fluorine-based and either a layer of resin, manufacturing method of the hose obtained by direct vulcanization bonding a layer consisting of epichlorohydrin rubber, consisting of the epichlorohydrin rubber It contains the following components (A) to (E) as a layer forming material, and
The blending ratio of the components (B) to (E) is 0.3 to 3 parts by weight of the component (B) and 0.01 to 100 parts by weight of the component (C) with respect to 100 parts by weight of the component (A). A hose characterized by using a rubber composition in which 0.3 parts by weight of the component (D) is set to 0.1 parts by weight or more, and the component (E) is set to 0.1 to 5 parts by weight. Law Made in. (A) Epichlorohydrin type rubber. (B) Thiourea compound. (C) Sulfur. (D) Aromatic disulfide compound. (E) 1,8-diazabicyclo [5.4.0] undecene-7 or its weak acid salt. 2. As a material for forming a layer made of the epichlorohydrin-based rubber, in addition to the components (A) to (E), the following component (F) is further contained, and the component (F) is blended. ratio, the per 100 weight parts component (a), (F) above manufacturing method of a hose according to claim 1, wherein the component uses a rubber composition which is set to 1 to 10 parts by weight. (F) Hydrotalcite compound. 3. A fluorine-containing rubber or a fluorine-containing resin
A rubber composition for a hose, which is directly vulcanized and bonded to a layer composed of either one of the layers , containing the following components (A) to (E):
One, the (B) ~ (E) blending ratio of components, (A) above
The component (B) is 0.3 to 3 with respect to 100 parts by weight of the component.
0.01 to 0.3 parts by weight of the component (C), 0.1 parts by weight or more of the component (D), and (E)
A rubber composition for a hose , wherein each of the components is set to 0.1 to 5 parts by weight. (A) Epichlorohydrin type rubber. (B) Thiourea compound. (C) Sulfur. (D) Aromatic disulfide compound. (E) 1,8-diazabicyclo [5.4.0] undecene-7 or its weak acid salt. 4. In addition to the above components (A) to (E), the following component (F) is further contained, and the mixing ratio of the above component (F) is 100 parts by weight of the above component (A). On the other hand, the component (F) is set to 1 to 10 parts by weight.
The rubber composition for a hose described. (F) Hydrotalcite compound.