KR102264912B1 - Rubber hose composition having excellent chemical resistance and heat resistance and rubber hose using the same - Google Patents

Abstract

The present invention relates to a rubber hose composition having excellent heat and chemical resistance and a rubber hose using the same, and more particularly, to a two-layer structure using fluororubber and ethylene acrylic rubber to withstand the resistance of mixed fuel. It relates to a rubber hose composition having excellent chemical properties.

Description

Rubber hose composition having excellent chemical resistance and heat resistance and rubber hose using the same

The present invention relates to a rubber hose composition having excellent heat and chemical resistance and a rubber hose using the same, and more particularly, to a two-layer structure using fluororubber and ethylene acrylic rubber to withstand the resistance of mixed fuel. It relates to a rubber hose composition having excellent chemical properties.

The conventional PCV (Positive Crankcase Ventilation) and BREATHER hose is a hose that transports and recirculates the blow-by gas (unburned gas_nitrogen oxide, hydrocarbon) of the engine to the surge tank without discharging the blow-by gas into the air. It plays a role in reducing air pollution by turning it toward the intake side and burning it.

However, recently, in order to reduce air pollution, in the United States, South America, and the Middle East, gasoline mixed with ethanol and methanol fuel is used.

In the past, when using gasoline fuel alone, a type 1 rubber hose made of AEM material with excellent heat resistance was used for unburned gas blow-by gas. However, with the use of FFV (Fuel Flexible Vehicle) mixed fuel, ethanol and methanol components in unburned gas are AEM material. As the durability of the rubber hose decreases by softening the rubber hose, it is necessary to use FKM, a polar rubber with excellent chemical resistance, and AEM, a non-polar rubber, with excellent heat resistance, on the outside.

However, there is a problem in that the inner surface FKM and outer surface AEM rubber do not adhere to each other during the manufacture of hose products because the inner surface polar rubber FKM and the non-polar rubber AEM material do not have good compatibility.

The present invention relates to a rubber hose composition having excellent heat resistance and chemical resistance, including polar rubber FKM having excellent chemical resistance and AEM having excellent heat resistance, and a rubber hose using the same.

In addition, the present invention relates to a rubber hose composition having excellent heat and chemical resistance, which has excellent adhesion between the inner layer rubber and the outer layer rubber, and a rubber hose using the same.

According to one embodiment of the present invention, the present invention is a first rubber layer comprising a fluororubber; and a second rubber layer comprising an ethylene acrylic rubber, wherein the first rubber layer includes a fluororubber, a first reinforcing agent, a second reinforcing agent, a vulcanization initiator, a by-product remover and a filler, and the second rubber layer is an ethylene acrylic rubber , a rubber hose composition having excellent heat resistance and chemical resistance including a third reinforcing agent, a fourth reinforcing agent, an adhesion aid, a crosslinking agent and an adhesion activator.

The first rubber layer is based on 100 parts by weight of the fluororubber, 12 to 18 parts by weight of the first reinforcing agent, 7 to 12 parts by weight of the second reinforcing agent, 3 to 9 parts by weight of the vulcanization initiator, 1 to 6 parts by weight of the by-product remover, and 10 parts by weight of the filler. to 20 parts by weight.

The first reinforcing agent may be carbon black N774, and the second reinforcing agent may be carbon black N330.

The vulcanization initiator may be calcium hydroxide.

The by-product remover may be magnesium oxide.

The filler may be barium sulfate.

The first rubber layer may further include a first plasticizer, an internal processing aid, and an external processing aid.

The second rubber layer includes 30 to 40 parts by weight of a third reinforcing agent, 60 to 70 parts by weight of a fourth reinforcing agent, 5 to 8 parts by weight of an adhesive agent, 1.5 to 2.5 parts by weight of a crosslinking agent, and 1.5 to 2.5 parts by weight of an adhesive activator based on 100 parts by weight of the ethylene acrylic rubber. 2.5 parts by weight.

The third reinforcing agent may be carbon black N550, and the fourth reinforcing agent may be carbon black N774.

The adhesive agent may be silicon oxide (Silicon Oxide).

The crosslinking agent may be hexamethylenediamine.

The adhesive activator may be Diazablcyclo undec salt.

The second rubber layer may further include a second plasticizer, a first processing aid, an adhesion aid, an anti-aging agent, an anti-scorch agent, an anti-adhesive agent, and a cross-linking accelerator.

According to another embodiment of the present invention, the first rubber layer; and a second rubber layer formed on the first rubber layer, wherein the first rubber layer and the second rubber layer include a rubber hose comprising the rubber hose composition according to claim 1 .

According to the inner aspect of the present invention, the present invention relates to a rubber hose composition excellent in heat resistance and chemical resistance that can withstand resistance to FFV ethanol and methanol fuel, which are mixed fuels, and a rubber hose using the same.

In addition, according to the present invention, by using a rubber hose composition excellent in resistance to mixed fuel and a rubber hose using the same, as the number of vehicles using mixed fuel increases, there is an effect of reducing air pollution caused by the use of conventional general fuel. have.

1 is a view showing the structure of a fuel hose according to an embodiment of the present invention.

The details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and in the following description, when a part is connected to another part, this is only the case where it is directly connected. However, it also includes cases in which other media are interposed in between. In addition, in the drawings, parts not related to the present invention have been omitted to clarify the description of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a view showing the structure of a fuel hose according to an embodiment of the present invention.

Referring to FIG. 1 , a rubber hose composition having excellent heat resistance and chemical resistance according to an embodiment of the present invention and a rubber hose using the same include a first rubber layer comprising fluororubber; and a second rubber layer comprising an ethylene acrylic rubber, wherein the first rubber layer includes a fluororubber, a first reinforcing agent, a second reinforcing agent, a vulcanization initiator, a by-product remover and a filler, and the second rubber layer is an ethylene acrylic rubber , a third reinforcing agent, a fourth reinforcing agent, an adhesion aid, a crosslinking agent and an adhesion activator. The first rubber layer is preferably made of fluorocarbon elastomer (FKM), and the second rubber layer is preferably ethylene arcrylic elastomer (AEM), which is ethylene acrylic rubber.

The first rubber layer is based on 100 parts by weight of the fluororubber, 12 to 18 parts by weight of the first reinforcing agent, 7 to 12 parts by weight of the second reinforcing agent, 3 to 9 parts by weight of the vulcanization initiator, 1 to 6 parts by weight of the by-product remover, and 10 parts by weight of the filler. to 20 parts by weight.

Since the first rubber layer is in direct contact with unburned gas and fuel, chemical resistance and fuel oil resistance should be excellent. In the present invention, in order to improve the fuel oil resistance of the first rubber layer, a fluorine content of 69% or more among the FKM raw rubber used as the first rubber layer is used.

Preferably, the first reinforcing agent is carbon black N774, the second reinforcing agent is carbon black N330, and the first reinforcing agent is 12 to 18 parts by weight, and the second reinforcing agent is 7 to 12 parts by weight. When the mechanical properties are the best.

In the present invention, carbon black is used as a reinforcing agent to improve the long-term durability of the rubber hose. Among carbon black, N774 Grade with a medium particle size and N330 Grade with a small particle size and excellent reinforcing effect are used. An excellent rubber hose can be provided.

The vulcanization initiator is preferably calcium hydroxide, and preferably contains 3 to 9 parts by weight. When the amount of calcium hydroxide as the vulcanization initiator is less than 3 parts by weight, there is a problem in that the vulcanization reaction is inhibited and adhesion to the second rubber layer is inhibited.

In addition, the by-product removing agent is preferably magnesium oxide (Magneslum oxide), and preferably contains 1 to 6 parts by weight. The by-product remover, magnesium oxide, serves to remove the by-product HF gas generated during fluorine vulcanization, and the vulcanization reaction occurs well and adhesion is improved only when the by-product HF gas is removed through the magnesium oxide. .

Therefore, in the present invention, by using a vulcanization initiator and a by-product remover in the first rubber layer, it is possible to provide a rubber hose having an excellent vulcanization reaction and excellent adhesion to the second rubber layer.

In addition, the filler preferably uses barium sulfate, and preferably contains 10 to 20 parts by weight. In general, conventional PCV hoses use ZnO (zinc oxide) as a filler to improve the extrusion surface, but when ZnO is used, adhesion with the second rubber layer is not achieved due to Zn+ ion reaction. In the present invention, by using barium sulfate instead of ZnO as a filler, it is possible to improve the FKM (first rubber layer) extrusion surface and improve adhesion with AEM (second rubber layer).

In addition, the first rubber layer may further include a first plasticizer, an internal processing aid, and an external processing aid. The first plasticizer is preferably dibutyl sebacate (dibutyl sebacate), and preferably contains 5 to 10 parts by weight.

The internal processing aid is preferably a mixture of aliphatic acid by-product (blend of aliphatic acid ramification), and preferably contains 0.5 to 2.0 parts by weight.

The external processing aid preferably uses carnauba wax (Carnauba Wax), and preferably contains 0.5 to 2.0 parts by weight.

The adhesion mechanism of the first rubber layer and the second rubber layer uses 3 to 9 parts by weight of a vulcanization initiator and 1 to 6 parts by weight of a by-product remover in the first rubber layer, so that the amine cross-linking of the first rubber layer and the amide cross-linking of the second rubber layer are interfacial. The liver reacts with the adhesion reaction. At this time, ZnO, which has been used as a filler in the prior art, plays a role in inhibiting the cross-linking reaction between the first and second rubber layers due to the generation of Zn+ ions.

The second rubber layer includes 30 to 40 parts by weight of a third reinforcing agent, 60 to 70 parts by weight of a fourth reinforcing agent, 5 to 8 parts by weight of an adhesive agent, 1.5 to 2.5 parts by weight of a crosslinking agent, and 1.5 to 2.5 parts by weight of an adhesive activator based on 100 parts by weight of the ethylene acrylic rubber. It is characterized in that it contains 2.5 parts by weight. The second rubber layer, AEM rubber, should be excellent in resistance to external heat, compression set and mechanical properties, and in particular, should have excellent adhesion to FKM rubber, which is the first rubber layer. When the Zn component is present in the second rubber layer as in the first rubber layer, the adhesive strength is greatly reduced, so it is not preferable to include the Zn component.

Preferably, the third reinforcing agent is carbon black N550, the fourth reinforcing agent is carbon black N774, and the third reinforcing agent includes 30 to 40 parts by weight, and the fourth reinforcing agent includes 60 to 70 parts by weight. When it is done, the reinforcement effect is excellent. In addition, the adhesive aid is preferably silicon oxide (Silicon Oxide), it is preferable to include 5 to 8 parts by weight.

The crosslinking agent is preferably hexamethylenediamine, and preferably includes 1.5 to 2.5 parts by weight. In the present invention, in order to satisfy the resistance to external heat of the second rubber layer, hexamethylenediamine is used as a crosslinking agent, and it is preferable to use Grade FD-10MB having a high hexamethylendiamine content. As the content of the crosslinking agent increases, heat resistance is excellent, but when it exceeds 2.5 parts by weight, other physical properties elongation and engine oil resistance are deteriorated, which is not preferable.

The adhesion activator is preferably diazablcyclo undec salt, and preferably contains 1.5 to 2.5 parts by weight. The adhesion assistant and the adhesion activator serve to improve adhesion with the first rubber layer, and when the amount exceeds the input content, there is a problem in that the adhesion is reduced.

In addition, the second rubber layer may further include a second plasticizer, a first processing aid, an adhesion aid, an anti-aging agent, an anti-scorch agent, an anti-adhesive agent, and a cross-linking accelerator.

The second plasticizer preferably uses dibutoxyethoxyethyl adipate, and preferably contains 8.0 to 12.0 parts by weight.

The first processing aid is preferably stearic acid, and preferably contains 1.0 to 2.0 parts by weight. It is preferable to use silicon dioxide as the adhesive aid, and it is preferable to include 5.0 to 10.0 parts by weight. The antifouling agent preferably uses phenylethyl aniline, and preferably contains 1.0 to 2.0 parts by weight. The anti-scorch agent preferably uses a mono amine type, and preferably contains 1.0 to 2.0 parts by weight. The anti-adhesive agent preferably uses a phosphanol type, and preferably contains 1.0 to 2.0 parts by weight. The crosslinking accelerator preferably uses diphenyl quinidine, and preferably contains 1.0 to 2.5 parts by weight.

Hereinafter, preferred examples are presented to help the understanding of the present invention. However, the following examples are only provided for easier understanding of the present invention, and the contents of the present invention are not limited by the following examples.

(Example 1) Physical properties of the first rubber layer (FKM) and adhesion strength test with the second rubber layer (AEM)

In Example 1, in order to evaluate the physical properties of the rubber hose composition excellent in heat resistance and chemical resistance according to an embodiment of the present invention, the following tests were performed. In Example 1, the contents of the materials added to the first rubber layer, FKM, used in the experiment were prepared as shown in Tables 1 and 2 below.

matter chemical name Grade Example 1 Example 2 Example 3 Example 4 Example 5 Ternary system, fluorine content: 69% Fluorocarbon Rubber Terpolymer FKM 100.0 100 100 100 100 Binary system, fluorine content: 66% Fluorocarbon Rubber Copolymer FKM adjuvant Carbon Black N774 20.0 15 15 15 15 adjuvant Carbon Black N330 10.0 5 5 5 5 vulcanization initiator Calcium hydroxide Renofit CF 6.0 6 3 6 9 by-product remover High Activity Magnesium oxide Stamag 150D 3.0 3 One 3 6 plasticizer Dibutyl sebacate DBS 5.0 5 5 10 5 filler zinc oxide ZnO filler barium sulfate BaSO4 15.0 15 15 15 15 internal processing aid Blend of Aliphatic Acid Ramification GYS 1.0 One One One One external processing aid Carnauba Wax Carnauba Wax #3 1.0 One One One One TOTAL 161.0 151.0 146.0 156.0 157.0

matter chemical name Grade Comparative Example 1 Comparative Example 2 Comparative Example 3 Ternary system, fluorine content: 69% Fluorocarbon Rubber Terpolymer FKM 100 100 Binary system, fluorine content: 66% Fluorocarbon Rubber Copolymer FKM 100 adjuvant Carbon Black N774 15 15 15 adjuvant Carbon Black N330 5 5 5 vulcanization initiator Calcium hydroxide Renofit CF 6 6 by-product remover High Activity Magnesium oxide Stamag 150D 3 3 3 plasticizer Dibutyl sebacate DBS 5 5 5 filler zinc oxide ZnO 15 15 filler barium sulfate BaSO4 15 internal processing aid Blend of Aliphatic Acid Ramification GYS One One One external processing aid Carnauba Wax Carnauba Wax #3 One One One TOTAL 151.0 151.0 145.0

State physical properties, aging properties, oil resistance, fuel oil resistance (method A), fuel oil resistance (method B), and adhesive strength with the second rubber layer, AEM rubber, using the first rubber layer prepared as shown in Tables 1 and 2 was evaluated and the results are shown in Tables 3 and 4 below. Table 3 is a table showing the evaluation results of the physical properties and adhesive strength of the first rubber layer according to Examples 1 to 5 of Example 1.

Properties Kinds range Example 1 Example 2 Example 3 Example 4 Example 5 state physical properties Hardness 75±5 82 75 75 70 78 The tensile strength
(kg/cm2) 100↑ 118 117 105 95 120 Elongation (%) 250↑ 285 320 350 410 300 aging properties
(130℃×70HR) hardness change -5 to +10 +3 +4 +6 +8 +3 Tensile strength change (%) -15
Below +2 +5 +6 +12 +3 kidney change
(%) -30
Below -5 -8 -15 -20 -4 oil resistance
(120℃×70HR×
IRM 903 OIL) hardness change -10 to +5 +1 0 -One -3 +1 Tensile strength change (%) -15 or less +9 +11 +15 +20 +8 kidney change
(%) -30 or less -5 -6 -8 -10 -4 volume change
(%) -10 to +10 +2 +1 +2 +3 +4 Fuel oil resistance (Method A)
(40℃×48HR×
FUEL D) hardness change -15~0 -10 -11 -10 -12 -9 Tensile strength change (%) -45 or less -13 -15 -25 -29 -10 kidney change
(%) -40 or less +3 +4 +6 +8 +2 volume change
(%) 0~+20 +9 +10 +15 +18 +15 Fuel oil resistance (method B)
(40℃×70HR×
FUEL C: ethyl alcohol
=8:2) hardness change -25~0 -12 -13 -19 -21 -17 Tensile strength change (%) -50 or less -25 -30 -35 -40 -23 kidney change
(%) -40 or less -10 -10 -15 -20 -15 volume change
(%) 0~+30 +18 +20 +25 +28 +17 Adhesive strength with AEM rubber Adhesive strength
(N) 40N
More than 38 51 33 37 40

Properties Kinds range Comparative Example 1 Comparative Example 2 Comparative Example 3 state physical properties Hardness 75±5 73 74 63 The tensile strength
(kg/cm2) 100↑ 118 112 85 Elongation (%) 250↑ 420 340 200 aging properties
(130℃×70HR) hardness change -5 to +10 +7 +5 +18 Tensile strength change (%) -15 or less +8 +6 +3 kidney change
(%) -30 or less -20 -9 -40 oil resistance
(120℃×70HR×
IRM 903 OIL) hardness change -10 to +5 +3 +1 +6 Tensile strength change (%) -15 or less +4 +9 -20 kidney change
(%) -30 or less -18 -8 -38 volume change
(%) -10 to +10 +6 +2 +15 fuel oil resistance
(Method A)
(40℃×48HR×
FUEL D) hardness change -15~0 -16 -9 -28 Tensile strength change (%) -45 or less -30 -20 -50 kidney change
(%) -40 or less -38 +5 -60 volume change
(%) 0~+20 +23 +10 +40 fuel oil resistance
(Method B)
(40℃×70HR×
FUEL C: ethyl alcohol
=8:2) hardness change -25~0 -23 -13 -45 Tensile strength change (%) -50 or less -30 -30 -60 kidney change
(%) -40 or less -38 -10 -55 volume change
(%) 0~+30 +33 +20 +35 Adhesive strength with AEM rubber Adhesive strength
(N) 40N or more 25 29 10

Referring to Tables 3 and 4 above, Examples 1 to 5, which are rubber compositions prepared according to the formulation of the rubber composition according to the present invention, have hardness and tensile strength, aging properties, oil resistance, fuel oil resistance and AEM rubber and It can be seen that all of the adhesive strengths are excellent, and in particular, in the case of Example 2, it can be seen that the adhesive strength and physical properties are very excellent.

However, in the case of Comparative Example 1 using binary fluororubber, fuel oil resistance, oil resistance and adhesive strength were unsatisfactory compared to the standard, and in Comparative Example 2 using ZnO as the filler, adhesion with the outer AEM material was unsatisfactory. It can be seen that it appeared In Comparative Example 3, which did not use the vulcanization initiator calcium hydroxide, the crosslinking density was lowered, and mechanical properties such as hardness, tensile strength, and elongation were lowered, and the adhesiveness with the outer surface AEM material was also unsatisfactory.

(Example 2) Physical properties of the second rubber layer (AEM) and adhesion strength test with the first rubber layer (FKM)

In Example 2, in order to evaluate the physical properties of the rubber hose composition excellent in heat resistance and chemical resistance according to an embodiment of the present invention, the following tests were performed. In Example 2, the contents of the materials added to the AEM, which is the second rubber layer used in the experiment, were prepared as shown in Tables 5 and 6 below.

function chemical name Grade Example 1 Example 2 Example 3 Example 4 Example 5 ternary system, viscosity 20 Polyethylene Acrylate Rubber VAMAC-G 100 100 100 100 100 adjuvant Carbon Black N550 30 40 30 30 30 adjuvant Carbon Black N774 60 70 60 60 60 plasticizer Dibutoxyethoxyethyl adipate TP-95 8 8 8 8 12 processing aid Stearic acid PH-100 2 2 2 2 2 Adhesion aid Silicon dioxide Nipsil VN3 5 5 5 5 10 filler zinc oxide ZnO KS#2 salvage Phenylethyl aniline AO445 2 2 2 2 2 anti-scorch agent Mono amine type 18D One One One One One anti-adhesive agent Phosphanol type EPA One One One One One crosslinking agent Hexamethylenediamine+amorphous Silica ADVANCURE crosslinking accelerator diphenyl quanidine DPG 2.5 1.5 1.5 1.0 1.5 crosslinking agent Hexamethylenediamine Blend FD-10 MB 3.0 2 2.0 1.0 2.0 Crosslinking promotion and adhesion activator Diazabicyclo undec salt+silica ACT-55 3.0 2 2.0 1.0 2.0 217.0 234.0 214.0 211.5 223.0

function chemical name Grade Comparative Example 1 Comparative Example 2 Comparative Example 3 ternary system, viscosity 20 Polyethylene Acrylate Rubber VAMAC-G 100 100 100 adjuvant Carbon Black N550 30 30 30 adjuvant Carbon Black N774 60 60 60 plasticizer Dibutoxyethoxyethyl adipate TP-95 8 8 8 processing aid Stearic acid PH-100 2 2 2 Adhesion aid Silicon dioxide Nipsil VN3 5 5 filler zinc oxide ZnO KS#2 0.5 salvage Phenylethyl aniline AO445 2 2 2 anti-scorch agent Mono amine type 18D One One One anti-adhesive agent Phosphanol type EPA One One One crosslinking agent Hexamethylenediamine+amorphous Silica ADVANCURE 2 crosslinking accelerator diphenyl quanidine DPG 1.5 1.5 1.5 crosslinking agent Hexamethylenediamine Blend FD-10 MB 2.0 2.0 Crosslinking promotion and adhesion activator Diazabicyclo undec salt+silica ACT-55 2 2.0 2.0 Total 214.0 209.0 214.5

State physical properties, aging properties, engine oil resistance, compression set and adhesion strength with FKM rubber were evaluated using the second rubber layer prepared as shown in Tables 5 and 6, and the results are shown in Tables 7 and 8 below. indicated.

Properties Kinds range Example 1 Example 2 Example 3 Example 4 Example 5 state physical properties Hardness 73±5 78 80 74 72 71 The tensile strength
(kg/cm2) 100↑ 145 145 132 115 108 Elongation (%) 250↑ 200 200 328 380 385 aging properties
(150℃×70HR) hardness change 0 to +10 +4 +4 +5 +8 +9 Tensile strength change (%) -below 10 -5 -5 +8 +10 +13 kidney change
(%) -50 or less -20 -15 -7 -20 -28 engine oil resistance
(100℃×70HR×
ENGINE OIL (90v%):
GASOLINE (10v%) hardness change -10 to 0 -5 -5 -7 -9 -9 Tensile strength change (%) -40 or less -6 -6 -8 -15 -19 kidney change
(%) -40 or less -8 -8 -12 -25 -30 volume change
(%) 0 to +20 +3 +3 +5 +10 +13 Compression permanent reduction rate (150℃×70HR×25% compression) 40 or less 22 22 22 30 35 Adhesive strength with FKM rubber Adhesive strength
(N) 40N or more 38 42 51 37 40

Properties Kinds range Comparative Example 1 Comparative Example 2 Comparative Example 3 state physical properties Hardness 73±5 78 80 74 The tensile strength
(kg/cm2) 100↑ 145 145 132 Elongation (%) 250↑ 200 200 328 aging properties
(150℃×70HR) hardness change 0 to +10 +4 +4 +5 Tensile strength change (%) -below 10 -5 -5 +8 Elongation change (%) -50 or less -20 -15 -7 engine oil resistance
(100℃×70HR×
ENGINE OIL (90v%):
GASOLINE (10v%) hardness change -10 to 0 -5 -5 -7 Tensile strength change (%) -40 or less -6 -6 -8 Elongation change (%) -40 or less -8 -8 -12 Volume change (%) 0 to +20 +3 +3 +5 Compression permanent reduction rate (150℃×70HR×25% compression) 40 or less 22 22 30 Adhesive strength with FKM rubber Adhesive strength (N) 40N or more 38 42 51

Referring to Tables 7 and 8, Examples 1 to 5, which are rubber compositions prepared according to the formulation of the rubber composition according to the present invention, have hardness and tensile strength, aging properties, engine oil resistance, compression set and FKM rubber. It can be seen that both and the adhesive strength are excellent, and in particular, in the case of Example 3, it can be seen that the adhesive strength and the physical properties are very excellent.

However, in the case of Comparative Example 1 prepared using another crosslinking agent, it can be seen that the adhesion strength with FKM rubber was very low, and even in the case of Comparative Example 2 in which silicon dioxide, an adhesion aid, was not used, FKM The adhesive strength with rubber was very low. In addition, it can be seen that even in the case of Comparative Example 3 using ZnO as a filler, the adhesive strength was very low.

The description of the present invention stated above is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. There will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (14)

a first rubber layer comprising fluororubber; and
Including; a second rubber layer comprising an ethylene acrylic rubber;
The first rubber layer and the second rubber layer do not contain zinc oxide,
The first reinforcing agent is carbon black N774, the second reinforcing agent is carbon black N330, the third reinforcing agent is carbon black N550, the fourth reinforcing agent is carbon black N774,
The first rubber layer is based on 100 parts by weight of the fluororubber, 15 parts by weight of the first reinforcing agent, 5 parts by weight of the second reinforcing agent, 3 parts by weight of the vulcanization initiator, 1 part by weight of the by-product remover, and 15 parts by weight of the filler,
The second rubber layer contains 30 parts by weight of a third reinforcing agent, 60 parts by weight of a fourth reinforcing agent, 5 parts by weight of an adhesive aid, 2 parts by weight of a crosslinking agent, and 2 parts by weight of an adhesive activator based on 100 parts by weight of an ethylene acrylic rubber,
The vulcanization initiator is calcium hydroxide, the by-product remover is magnesium oxide, the filler is barium sulfate, and the adhesion aid is silicon oxide. delete delete delete delete delete The method of claim 1,
The first rubber layer is a rubber hose composition excellent in heat resistance and chemical resistance, characterized in that it further comprises a first plasticizer, an internal processing aid and an external processing aid. delete delete delete delete According to claim 1,
The adhesive activator is a rubber hose composition excellent in heat resistance and chemical resistance, characterized in that the diazabicyclo undec salt (Diazablcyclo undec salt). The method of claim 1,
The second rubber layer is a rubber hose composition excellent in heat resistance and chemical resistance, characterized in that it further comprises a second plasticizer, a first processing aid, an adhesive aid, an anti-aging agent, an anti-scorch agent, an anti-adhesive agent and a cross-linking accelerator. a first rubber layer; and
Including; a second rubber layer formed on the first rubber layer;
The first rubber layer and the second rubber layer is a rubber hose, characterized in that it comprises the rubber hose composition according to claim 1.

Images