KR100687623B1 - Fuel hose having acrylic rubber layer for vehicle - Google Patents

Abstract

A fuel hose for a vehicle is provided to improve resistance against pressure and heat, by forming an intermediate layer and an outer surface of the fuel hose with an acrylic rubber material. A fuel hose(10) for a vehicle, includes an inner layer(11) having an internal space for delivery of fuel; an intermediate layer(13) covering an outer surface of the inner layer; an outer layer(17) covering the intermediate layer; and a reinforcement layer(15) formed between the intermediate layer and the outer layer. The inner layer is made of a fluorine rubber, and the intermediate layer has at least one acrylic rubber layer. The acrylic rubber layer is made of acrylic rubber containing at least one adhesion promoting agent of dibutyl thiourea and calcium hydrate. The reinforcement layer is a polyamide-based reinforcement layer, and the outer surface is made of acrylic rubber.

Description

Fuel Hose Having Acrylic Rubber Layer for Vehicle

1 is a partial cutaway perspective view showing an automotive fuel hose of a first embodiment according to the present invention.

2 is a partially cutaway perspective view showing a fuel hose for a vehicle of a second embodiment according to the present invention.

Explanation of symbols on the main parts of the drawings

11,51; Inner layer 13; Mezzanine

15,55; Reinforcement layer 17,57; Outer layer

53; First interlayer 54; 2nd intermediate layer

The present invention relates to an automotive fuel hose used for fuel supply of an automobile, and more particularly, to an automotive fuel hose having a plurality of rubber layer structures and including an acrylic rubber layer for extending the life.

In general, the fuel hose used for fueling a vehicle includes an inner layer made of fluorine rubber, an intermediate layer made of epichlorohydrin rubber, a reinforcement layer made of polyethylene terephthalate, and an outer layer made of epichlorohydrin rubber. Four-layer fuel hose is mainly used. The intermediate layer may be a fuel hose composed of a first intermediate layer of fluororesin and a second intermediate layer of epichlorohydrin rubber.

The fuel hose of this structure has been able to satisfy the general use condition of the automobile, for example, fuel oil resistance, general heat resistance, cold resistance, ozone resistance, and vibration durability of the vehicle itself.

However, in recent years, as the endurance warranty of automobiles is increased and the engine output is increased, the engine room temperature of the automobile itself is increased, and the durability life of each component and the heat resistance according to the temperature increase are required. However, such a fuel hose has become difficult to meet such demands. In addition, due to the high temperature heat generated in the engine, thermal damage of not only the outer layer but also the reinforcement yarn layer is generated, and as a result, the fuel hose does not support the expansion pressure of the fuel, and there is a risk of ignition due to fuel leakage.

Accordingly, an object of the present invention is to solve the problems of the conventional fuel hose for automobiles having the structure as described above, while improving the material can improve the heat resistance of the hose while being able to improve the burst resistance and durability performance The purpose is to provide a fuel hose.

In order to achieve the above object, the present invention is formed between an inner surface layer forming an inner space in which fuel is transferred, an intermediate layer surrounding the outer circumferential surface of the inner layer, an outer surface layer surrounding the intermediate layer, and the intermediate layer and the outer layer. A fuel hose for automobiles including a reinforcing yarn layer, wherein the inner surface layer is made of fluorine rubber containing fluorine, the middle layer is made of at least one layer, and includes an acrylic rubber layer made of acrylic rubber, and the reinforcing yarn layer is polyaramid. Provided is a system reinforcement yarn layer, and an outer surface layer is an automotive fuel hose made of acrylic rubber.

In the fuel hose for automobiles according to the present invention, the acrylic rubber preferably contains at least one of dibutylthiourea and calcium hydroxide as an adhesion promoter.

In the fuel hose for automobiles according to the present invention, the dibutylthiourea system is preferably 1 to 2 parts by weight based on 100 parts by weight of the acrylic rubber. And it is preferable that calcium hydroxide is 3-7 weight part with respect to 100 weight part of acrylic rubber.

In the fuel hose for automobiles according to the present invention, the intermediate layer may be composed of a fluorine resin, the first intermediate layer in contact with the inner layer, and the acrylic rubber, and the second intermediate layer in contact with the first intermediate layer.

In addition, in the fuel hose for automobiles according to the present invention, the intermediate layer is preferably an acrylic rubber using amine (Amine) as a vulcanizing agent. And it is preferable that the inner surface layer and the intermediate | middle layer made the direct bonding between layers by vulcanization. Here, the intermediate layer is 100 parts by weight of acrylic, 2 parts by weight of stearic acid, 1.5 parts by weight of ethylene wax, 10 parts by weight of calcium carbonate, 30 parts by weight of FEF, 50 parts by weight of SRF, 10 parts by weight of DOS, 1.4 parts by weight of triethylene tetraamine. , 1,3 diphenyl guanidine (Diphenyl Guanidine) may be composed of 4 parts by weight.

In the fuel hose for automobiles according to the present invention, the inner surface layer is preferably a fluorine rubber having a fluorine content of 68 to 71%.

Hereinafter, an automobile fuel hose according to the present invention will be described in more detail with reference to the accompanying drawings.

First embodiment

1 is a partial cutaway perspective view showing an automotive fuel hose of a first embodiment according to the present invention.

1, the automotive fuel hose 10 of the present embodiment is a fuel hose structure having an internal space in which fuel is transmitted, and has a four-layered cross-sectional structure. The inner layer 11, the intermediate layer 13, the reinforcing yarn layer 15, and the outer layer 17 are sequentially formed from the inner space. The intermediate layer 13 is formed to surround the inner layer 11, the reinforcement layer 15 is formed to surround the intermediate layer 13, and the outer layer 17 is formed to surround the reinforcement layer 15. do.

The inner layer 11 is made of fluorine rubber containing fluorine. Here, the inner layer 11 is preferably a fluorine rubber having a fluorine content of 68 to 71%. This is to improve fuel permeability due to the characteristics of the fuel hose. When fluorine rubber having a fluorine content of 68% or less is used, the fuel permeability increases, and when it exceeds 71%, the frictional force is reduced, so that it is bonded to the metal tube. This is because scratches may occur during the process, and it is difficult to maintain the bonded state after completion of the coupling.

The intermediate layer 13 is made of acrylic rubber. At this time, any kind of acrylic rubber may be used as long as it is rubber which is vulcanized by an amine vulcanization system using an amine as a vulcanizing agent. For example, the intermediate layer 13 is 100 parts by weight of acrylic, 2 parts by weight of stearic acid, 1.5 parts by weight of ethylene wax, 10 parts by weight of calcium carbonate, 30 parts by weight of FEF, 50 parts by weight of SRF, 10 parts by weight of DOS, triethylene tetraamine 1.4 parts by weight of 1,3 diphenyl guanidine (Diphenyl Guanidine) may be composed of 4 parts by weight.

The acrylic rubber contains 1 part by weight of dibutylthiourea and 5 parts by weight of calcium hydroxide with respect to 100 parts by weight of the acrylic rubber as an adhesion promoter. Here, the acrylic rubber may include any one of dibutyl thiourea and calcium hydroxide. It is preferable that dibutyl thiourea type is 1-2 weight part with respect to 100 weight part of acrylic rubber. And it is preferable that calcium hydroxide is 3-7 weight part with respect to 100 weight part of acrylic rubber. On the other hand, the intermediate layer is directly bonded to each other by vulcanization together with the inner surface layer.

The reinforcement yarn layer 15 formed between the outer surface layer 17 and the intermediate layer 13 is formed of a known polyaramid-based reinforcement yarn. Polyaramid-based reinforcing yarns are much more resistant to heat and pressure than polyvinyl alcohol-based or polyethylene terephthalate-based reinforcing yarns and are suitable for use in high temperature and high pressure conditions.

The outer layer 17 uses acrylic rubber excellent in weather resistance and heat resistance. It forms by amine vulcanization using an amine as a vulcanizing agent.

The manufacturing method of the automotive fuel hose 10 having such a structure is formed by extruding the inner surface layer 11 and the intermediate layer 13 at the same time. Forming a double or triple structure or continuous extrusion line and forming at the same time helps to improve adhesion between the layers. And it is braided by reinforcement yarn on it. When the outer layer 17 is extruded and vulcanized after braiding, the fuel hose 10 for automobiles of the present structure can be made.

Second embodiment

2 is a partially cutaway perspective view showing a fuel hose for a vehicle of a second embodiment according to the present invention.

2, the automotive fuel hose 50 of this embodiment has a five-layered cross-sectional structure. The inner surface layer 51, the first intermediate layer 53, the second intermediate layer 54, the reinforcing yarn layer 55, and the outer surface layer 57 are sequentially formed from the inner space. Unlike the first embodiment described above, there is a feature in the structure consisting of a plurality of intermediate layers (53, 54).

The first intermediate layer 53 is made of fluorine resin and surrounds the inner layer 53. The second intermediate layer 54 is composed of acrylic rubber and surrounds the first intermediate layer 53. The inner surface layer 51, the reinforcement yarn layer 55, and the outer surface layer 57 are made of the same material as in the above-described first embodiment.

The experimental results carried out by the applicant for the fuel hose for automobiles according to the present invention as described above are as follows.

Table 1 shows the composition of the rubber used in the intermediate layer, Table 2 shows the physical properties of the adhesive rubber prepared according to Table 1 and the adhesion between the fluorine rubber or fluorine resin and acrylic rubber. Adhesion between the two layers was measured on a specimen subjected to vulcanization at 150 ° C. for 30 minutes in a heat transfer press for preparing rubber specimens.

Experimental Comparative Example in Table 1 is an acrylic intermediate layer having the configuration of the hose used in the oil, Experimental Examples 1, 2, 3 are the changes in the type and content of the adhesion promoter in the fuel hose according to the first embodiment of the present invention The example of the intermediate | middle layer which follows is shown. Oil-based hoses typically do not contain adhesion promoters. In contrast, the experimental examples of Table 1 include at least one of dibutylthiourea and calcium hydroxide.

Interlayer Ingredients Content (parts by weight) Experimental Comparative Example Experimental Example One 2 3 Polymer Acrylic rubber 100 100 100 100 Processing aid Stearic acid 2 2 2 2 Ethylene wax 1.5 1.5 1.5 1.5 Adhesion promoter FX-5166 ⁽¹⁾ - 5 - - DBU ⁽²⁾ - - 1.5 One Calcium hydroxide - - - 5 Filler Calcium carbonate 10 10 10 10 FEF 30 30 30 30 SRF 50 50 50 50 Plasticizer DOS 10 10 10 10 Vulcanizing agent Amine ⁽³⁾ 1.4 1.4 1.4 1.4 Vulcanization accelerator D ⁽⁴⁾ 4 4 4 4  (1) FX-5166: Organophosphonium + Silicon dioxide (2) DBU: Dibutylthiourea (3) Amine: Triethylene Tetraamine (4) D: 1,3 Diphenyl Guanidine

Test Items unit Experimental Comparative Example Experimental Example One 2 3 100 ° C (1 + 4) ML MU 36.6 30.7 33.4 34.0 125 ℃ Vm MU 22.5 20.0 20.3 20.4 T5 minute 5.9 4.4 5.1 5.3 150 ℃ vulcanization degree T10 minute 2.6 2.0 2.6 2.6 T90 minute 30.8 31.6 31.7 31.7 ML kgf, cm 0.7 0.5 0.6 0.6 MH kgf, cm 17.5 16.5 15.8 16.6 Basic properties Hardness hs 73 70 69 70 The tensile strength kgf / cm ² 98 95 96 99 Elongation % 314 329 342 331 Fluorine Rubber / Acrylic Rubber Adhesion kgf / in 1.2 2.2 5.7 8.2 Fluoropolymer / Acrylic Rubber Adhesion kgf / in 1.0 1.8 4.6 7.8

As shown in Table 1 and Table 2, the combination of dibutylthiourea and calcium hydroxide as a metal oxide used to improve the adhesion between fluororubber or fluororesin and acrylic rubber is the best in physical properties and adhesion compared to other formulation examples. It can be seen that this can be achieved by the rubber vulcanization conditions without the use of adhesive when manufacturing fuel hose.

On the other hand, the automotive fuel hose according to the present invention as described above, the heat resistance does not generate a crack (Crack) on the outer layer for 1000 hours at 150 ℃, the hose burst pressure is 100kgf / cm ² or more. The durability of the fuel hose also results in a significantly improved result compared to conventional fuel hoses.

Hereinafter, the product configurations of Comparative Example 1 and Comparative Example 2, which are examples of the fuel hose for automobiles according to the present invention and examples according to the prior art, and their performance evaluation results are shown in detail in Table 3 below. Here, in Example 1, the intermediate layer is composed of a single layer as an acrylic rubber material, and Example 2 is composed of a first intermediate layer made of a fluororesin and a second intermediate layer of acrylic rubber material.

division Comparative Example Example One 2 One 2 rescue Inner layer FKM ⁽¹⁾ FKM FKM FKM Middle first floor ECO ⁽²⁾ Fluoropolymer ⁽³⁾ Acrylic rubber Fluorine Resin Middle 2F - ECO - Acrylic rubber Bo River Floor PVA OR PET PVA OR PET Aramid Aramid Exterior layer ECO ECO Acrylic rubber Acrylic rubber Performance Burst Pressure (kgf / cm ² ) 80 95 120 130 Heat Resistance (℃) ⁽⁴⁾ 120 120 150 150 Vibration Durability ⁽⁵⁾ 300hr crack 300hr crack No cracks No cracks Pressure resistance (20kgf / cm ² ) No leakage No leakage No leakage No leakage Fuel Permeability ⁽⁶⁾ (g / m ² / day) 15.7 1.5 15.4 1.4  Note) (1) FKM: Fluorine rubber with a fluorine content of 68% or more (2) ECO: Epichlorohydrin rubber (3) Fluorine resin: Resin with a fluorine content of 70% or more (4) Heat resistance: Temperature without cracking during 1000hr evaluation (5) Vibration durability: 1000hr evaluation under the condition of pressure 3bar, ambient temperature 100 ℃, amplitude 30mm, frequency 35cpm (6) Fuel permeability: sealed fuel C inside the fuel hose and stored for 14 days at 40 ℃

The heat resistance of Table 3 was evaluated based on 1000 hours, and the burst pressure is the result of evaluation based on KSM 6540. The durability evaluation was carried out in the vibration durability tester to reproduce the condition similar to the interior of the vehicle. As a result of the experiment, it can be seen that the automotive fuel hose according to the present invention shows superior pressure resistance, heat resistance, and durability compared with conventional fuel hose products.

As described above, the automotive fuel hose according to the present invention has an intermediate layer and an outer surface layer composed of acrylic rubber, especially an acrylic rubber including at least one of dibutylthiourea and calcium hydroxide as an adhesion promoter. With excellent pressure resistance, heat resistance and durability, it is possible to extend the warranty life of fuel hose life and can be applied under various environmental conditions.

Claims (9)

An automotive fuel hose including an inner surface layer forming an inner space in which fuel is transferred, an intermediate layer surrounding an outer circumferential surface of the inner surface layer, an outer surface layer surrounding the intermediate layer, and a reinforcement yarn layer formed between the intermediate layer and the outer surface layer. as, The inner layer is made of fluorine rubber containing fluorine, the middle layer has at least one acrylic rubber layer made of acrylic rubber, and the acrylic rubber contains at least one of adhesion promoters of dibutylthiourea and calcium hydroxide. An automotive fuel hose comprising an acrylic rubber, wherein the reinforcing yarn layer is a polyamide-based reinforcing yarn layer, and the outer layer is made of acrylic rubber. delete According to claim 1, The dibutyl thiourea-based fuel hose for automobile, characterized in that 1 to 2 parts by weight based on 100 parts by weight of the acrylic rubber. According to claim 1, The calcium hydroxide is an automotive fuel hose, characterized in that 3 to 7 parts by weight based on 100 parts by weight of acrylic rubber. According to claim 1, The intermediate layer is composed of a fluorine resin, the first intermediate layer and the acrylic rubber in contact with the inner surface layer and the automotive fuel hose, characterized in that composed of a second intermediate layer in contact with the first intermediate layer. According to claim 1, The intermediate layer is an automotive fuel hose, characterized in that the acrylic rubber using an amine as a vulcanizing agent. According to claim 1, And said inner layer and said intermediate layer are attached by interlayer bonding by vulcanization. According to claim 1, The intermediate layer is 100 parts by weight of acrylic, 2 parts by weight of stearic acid, 1.5 parts by weight of ethylene wax, 10 parts by weight of calcium carbonate, 30 parts by weight of FEF, 50 parts by weight of SRF, 10 parts by weight of DOS, 1.4 parts by weight of triethylene tetraamine, 1,3 Diphenyl Guanidine (Diphenyl Guanidine) Automotive fuel hose, characterized in that consisting of 4 parts by weight. According to claim 1, The inner layer is a vehicle fuel hose, characterized in that the fluorine rubber of 68 to 71% fluorine content.

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