JP2747861B2 - Hose for copper tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose for a copper pipe used in electric equipment such as a large-sized computer and pure water washing.

[0002]

2. Description of the Related Art In recent years, with the advance of technology, high-performance electronic devices such as large-sized computers and supercomputers for performing complicated technical calculations and enormous data processing have been developed and are being used in various industrial fields. . For these electronic devices, high-performance and high-performance devices, such as high processing speed,
There is a strong demand for compact equipment. For this reason,
As the semiconductor elements mounted on the devices, those with higher integration are used, and they tend to be mounted at high density.

[0003] When a semiconductor element is highly integrated, the current density increases and the temperature thereof rises.
Therefore, the performance of the circuit will be reduced as it is.
The heat dissipation is improved. However, in such high-performance and high-performance electronic devices, the amount of semiconductor elements used is remarkably large, and since the devices are mounted at a high density, the amount of heat generated is large. It is becoming more difficult to control. Therefore,
Recently, in order to increase the cooling capacity, devices equipped with a closed cooling system using pure water as cooling water have been developed. In this case, a conventional rubber hose is used as a piping material for transferring the cooling water in consideration of workability in piping, bending piping, and the like.

[0004]

The above rubber hose is usually used by being connected to a copper tube. And, as the cooling water, usually, in pure water, as a copper corrosion inhibitor,
A solution in which benzotriazole (hereinafter abbreviated as "BTA") is used. This BTA forms a chelate film on the copper surface to prevent corrosion due to oxidation of copper. However, the material for forming the rubber hose generally contains zinc oxide as a vulcanization aid for sulfur vulcanization, and the BTA forms a chelate film with zinc of zinc oxide before copper, so that copper is formed. The corrosion prevention effect cannot be obtained.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a copper pipe hose having an excellent anticorrosion action that does not cause corrosion of connected devices and the like.

[0006]

In order to achieve the above object, a copper pipe hose according to the present invention is provided with a zinc oxide-free rubber containing at least one of ethylene-propylene-diene rubber and ethylene-propylene rubber as a main component. It has a configuration including an innermost layer formed of a composition, a pressure-resistant reinforcing layer formed on the outer peripheral surface of the innermost layer, and a flexible outermost layer formed on the outer peripheral surface of the pressure-resistant reinforcing layer.

[0007]

The present inventors have conducted a series of studies to obtain a hose which does not cause corrosion of copper tubes. In the course of the research, they found that the BTA contained in the cooling water and the zinc oxide zinc in the rubber hose forming material formed a chelate film, which prevented the formation of a chelate film for corrosion prevention on the copper surface. Was. As a result of further research, the innermost layer of the rubber hose was formed from ethylene-propylene-diene rubber (hereinafter abbreviated as “EPDM”) or ethylene-propylene rubber (hereinafter abbreviated as “EPM”) as a main component, and sulfur added. By using a rubber composition that does not contain zinc oxide, which is a vulcanization aid for sulfur, BTA used as a corrosion inhibitor for copper does not produce zinc and a chelate film,
The present inventors have found that BTA forms a chelate film on the copper surface and that excellent corrosion resistance can be obtained, and reached the present invention.

Next, the present invention will be described in detail.

As shown in FIG. 1, the copper tube hose according to the present invention has an innermost layer 1 formed by using a rubber composition containing a specific rubber component as a main component and not containing zinc oxide. And a flexible outermost layer 3 formed on the outer peripheral surface of the pressure-resistant reinforcing layer 2.

The innermost layer 1 is formed by performing peroxide vulcanization using a zinc oxide-free rubber composition containing at least one of EPDM and EPM as a main component.

The EPDM or EPM is not particularly limited, and a conventionally known one can be used.

The vulcanizing agents for EPDM and EPM include:
Dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 1,3-bis (t
-Butylperoxyisopropyl) benzene, 1,1-
And peroxides such as di-t-butylperoxy-3,3,5-trimethylcyclohexane. These are used alone or in combination.

In addition to the above, a processing aid such as stearic acid, a reinforcing agent such as carbon black, a softening agent such as oil, and the like can be used as needed.

The pressure-resistant reinforcing layer 2 formed on the outer peripheral surface of the innermost layer 1 is formed by braiding a fiber such as polyester fiber, vinylon, rayon, or the like, or a wire such as a piano wire into a blade shape or a spiral shape. .

The outermost flexible layer 3 formed on the outer peripheral surface of the pressure-resistant reinforcing layer 2 is formed using, for example, polyethylene, chlorinated polyethylene, or the like.

The copper pipe hose of the present invention can be manufactured, for example, as follows. That is, first, the materials for forming the innermost layer and the outermost flexible layer are blended and mixed, respectively. Then, the innermost layer is extruded by an extruder using the innermost layer forming material, and a pressure-resistant reinforcing layer is braided on the outer peripheral surface of the innermost layer by a braiding machine. Then, a flexible outermost layer is extruded thereon by an extruder to be integrated, and then vulcanized and adhered to produce the outermost layer. The vulcanization conditions in this case are set to those in ordinary peroxide vulcanization, for example, a temperature of 150 to 170 ° C. and a time of 20 to 60 minutes.

The thickness of each layer of the copper pipe hose thus obtained is 1.0 mm for the innermost layer 1 and the outermost flexible layer 3.
It is preferable to set it to 3.0 mm. The pressure-resistant reinforcing layer may be braided into a single layer or a plurality of layers depending on the working pressure.

[0018]

As described above, the innermost layer of the copper pipe hose of the present invention is formed of a rubber composition containing EPDM or EPM as a main component and not containing zinc oxide. Therefore, when this is used as a transfer hose for pure water containing BTA, the BTA does not form a chelate film with zinc oxide, which is a vulcanization aid for sulfur vulcanization, as in the prior art, but on the copper surface. Excellent corrosion resistance can be obtained by forming a chelate film for corrosion prevention. Therefore, the copper pipe hose of the present invention is most suitable as a device provided with a cooling system using pure water as cooling water, for example, a copper pipe hose for transferring pure water to a large computer or the like.

Next, examples will be described together with comparative examples.

[0020]

Examples 1 and 2 First, the respective components shown in Table 1 below were blended in the proportions shown in the same table to prepare a rubber composition as a material for forming the innermost layer. Then, using the rubber composition, first, an innermost layer having a thickness of 1.5 mm is extruded by an extruder, and a polyester fiber is braided into a braided shape on the outer peripheral surface to form a pressure-resistant reinforcing layer. A 1.5 mm thick outermost flexible layer made of the same material as the innermost layer was formed. Then, peroxide vulcanization (condition: 160 ° C. × 30)
1) to obtain a copper pipe hose having a three-layer structure shown in FIG.

[0021]

[Table 1]

* 1: Esprene 514F, manufactured by Sumitomo Chemical Co., Ltd. * 2: JSR EP11, manufactured by Nippon Synthetic Rubber Co., Ltd.

[0023]

Comparative Examples 1 and 2 First, the respective components shown in Table 2 below were blended in the proportions shown in the same table to prepare a rubber composition as a material for forming the innermost layer. Then, using the rubber composition, first, an innermost layer having a thickness of 1.5 mm is extruded by an extruder, and a polyester fiber is braided into a braided shape on the outer peripheral surface to form a pressure-resistant reinforcing layer. A 1.5 mm thick outermost flexible layer made of the same material as the innermost layer was formed. Next, sulfur vulcanization (condition: 160 ° C x 30 minutes)
By performing the above, a copper tube hose having a three-layer structure was obtained.

[0024]

[Table 2]

Next, a test piece having a surface area of 450 cm ² was taken from the thus-obtained example product and comparative example product and immersed in 500 ml of a 1000 ppm BTA solution at 70 ° C. for 20 days, after which the concentration of the BTA solution was measured. Was measured. The results are shown in Table 3 below. In addition, a test product punched out from the inner layer of the rubber hose with a JIS No. 3 dumbbell,
It was immersed in a 1000 ppm BTA solution at 80 ° C. for 14 days, taken out, and allowed to stand at room temperature for 30 minutes. Then, the attached matter on the surface of the test article was analyzed by an infrared absorption spectrum analyzer (IR). The results are shown in Table 3 below.

[0026]

[Table 3]

From the results shown in Table 3 above, all of the comparative examples have a low immersed BTA concentration, and the surface has B
TA was detected. From this, it can be seen that in the comparative example product, a chelate film was formed on the hose surface with BTA and zinc of zinc oxide in the material. On the other hand, in the example product, the BTA concentration in which the hose of the example product was immersed was high, and no adhering substance was detected on the surface, indicating that it did not react with the substance in the hose material. Therefore, when this is used as a copper tube hose, it can be seen that BTA forms a chelating film on the surface of the copper tube, exhibits a sufficient anticorrosion effect, and prevents corrosion of equipment. As a result of using this as a cooling hose for a large-sized computer connected to a copper tube, it exhibited an excellent anticorrosion effect on copper and was able to cope sufficiently without causing corrosion of equipment and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a copper pipe hose of the present invention.

[Explanation of symbols]

 1 innermost layer 2 pressure-resistant reinforcing layer 3 outermost layer of flexibility

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16L 11/08 F16L 11/08 A

Claims (2)

(57) [Claims] 1. An innermost layer formed of a rubber composition containing no zinc oxide and containing at least one of ethylene-propylene-diene rubber and ethylene-propylene rubber as a main component, and a pressure resistance formed on the outer peripheral surface of the innermost layer. A copper pipe hose comprising: a reinforcing layer; and a flexible outermost layer formed on an outer peripheral surface of the pressure-resistant reinforcing layer. 2. The copper pipe hose according to claim 1, wherein the innermost layer is formed by peroxide vulcanization.