JPH0999504A - High pressure resin hose and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a high pressure resin hose excellent in abrasion resistance. SOLUTION: A reinforcing layer 3 is provided between an inner pipe 2 and an outer pipe 1 and the outer pipe 1 is composed of a high pressure resin hose composed of a thermoplastic resin containing silicone and the wt. content of silicone to the thermoplastic resin is set to 0.5-10%. The thermoplastic resin containing silicone is used in the production of a high pressure resin hose by kneading both of the outer and inner tubes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure resin hose having an outer tube made of a thermoplastic resin such as urethane and a method for producing the same, which is used for construction machinery and the like, and more particularly, to a surface of the hose outer tube. The present invention relates to a high pressure resin hose having a reduced friction coefficient and improved wear resistance, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, the outer tube of a high pressure resin hose has been
Thermoplastic resins such as ether-based polyurethane, which are well balanced in weather resistance, flexibility, abrasion resistance and economy, are used.

[0003]

By the way, since the high-pressure resin hose used in the conventional construction machine or the like is subjected to vibration or swing, the outer pipe surface of the hose is easily rubbed by an adjacent member. There is. Conventional high-pressure resin hoses using an outer tube made of a thermoplastic resin such as ether polyurethane have abrasion resistance, but they have not always been sufficient for long-term use.

Therefore, a method of reducing the soft segment in the molecule to improve the abrasion resistance was tried, but in this case, the flexibility of the hose was impaired, which was not preferable. The present invention has been devised in view of such conventional problems, and an object thereof is to provide a high-pressure resin hose having a hose outer tube having a smaller friction coefficient and excellent hose surface abrasion resistance. It is what Another object of the present invention is to provide a method for producing a high-pressure resin hose which allows the hose of the present invention to be produced easily and at low cost.

[0005]

In order to achieve the above object, the present invention is a high-pressure resin hose in which one or more reinforcing layers are provided between an inner pipe and an outer pipe, the outer pipe of which is made of silicone. It is composed of a thermoplastic resin contained therein. The weight content of silicone, which exerts a greater effect, with respect to the thermoplastic resin is 0.5% to 10%.

The thermoplastic resin used for the outer tube has the following properties:
Ether-based polyurethanes that are well-balanced in processability and cost are preferable, but in addition to these, ester-based polyurethanes, polyamides, polyesters, polyolefins and the like can also be used. The present invention is configured as described above,
As a method for producing a high-pressure resin hose, a thermoplastic resin and a pellet-shaped, granular, or powder-like silicone mixed resin are inserted into a tuber, and the thermoplastic resin and the silicone mixed resin are kneaded in the tuber to form a silicone. A thermoplastic resin to be contained is produced, and the silicone-containing thermoplastic resin is extruded onto the reinforcing layer to form an outer tube.

The silicone mixed resin to be inserted into the tuber is preferably granular or powdery. Further, as the silicone mixed resin, one in which an ethylene methyl methacrylate copolymer or an ethylene vinyl acetate copolymer contains silicone is preferable, and the weight content of the silicone is preferably 30% to 80%. Is.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a partially cutaway perspective view of a high-pressure resin hose embodying the present invention. The outer tube 1 is made of a thermoplastic resin containing silicone, and the inner tube 2 is made of a flexible material such as rubber or resin. , Outer tube 1 and inner tube 2
A reinforcing layer 3 made of steel wire or fiber having a braided or spiral structure is provided between and.

When the reinforcing layer 3 is composed of a plurality of layers, the intermediate layer 4 may be interposed for adhesion between the reinforcing layers.
The weight content of silicone is preferably 0.5% to 10% with respect to the thermoplastic resin, and ether polyurethane is used as the thermoplastic resin. The abrasion resistance is good even if the silicone content exceeds 10%, but in that case, the cost increases, so the silicone content is 10%.
% Or less is preferable.

Next, a method of manufacturing the high pressure resin hose will be described with reference to FIG. Incidentally, except for the step of producing a thermoplastic resin containing silicone, for example, JP-A-56-44
Since it is manufactured by a conventional method such as 642, it will be briefly described. First, the inner tube 2 is extruded using the tuber 5, and the reinforcing layers 3 and 3 are braided on the inner tube 2 by the braiders 6 and 7 with the intermediate layer 4 interposed.

Next, an adhesive is applied to the outer surface of the reinforcing layer 3 in the adhesive tank 8, and a tuber 6 is coated with a thermoplastic resin containing silicone to form the outer tube 1.
The hose thus formed is wound around the drum 10. In the manufacturing process of the present invention, in addition to the conventional manufacturing method described above, a thermoplastic resin such as polyurethane and an ethylene-methyl methacrylate copolymer or ethylene-containing resin are formed on the tuber 9 before the outer tube 1 is molded by the tuber. A pellet-shaped silicone mixed resin containing silicone in a weight ratio of 60% to the vinyl acetate copolymer is inserted, and the thermoplastic resin and the silicone mixed resin are mixed in a tuber 9 to obtain silicone. The contained thermoplastic resin is produced.

Then, the thermoplastic resin thus produced is extruded from the tuber 9 to form the outer tube 1. It should be noted that the silicone mixed resin includes the product number SP100 or SP1 manufactured by Dow Corning Co., Ltd.
Although 10 is used, the present invention is not limited to this, and other silicone additives can be used.

[0013]

EXAMPLES The measured values of dynamic friction coefficient and abrasion resistance of Examples and Comparative Examples are shown in Table 1 below.

[0014]

[Table 1] Example 1 is a hose with a pressure resistance of 210 k and an inner diameter of 9 mm.
The outer tube is a high-pressure resin hose made of thermoplastic ether polyurethane and silicone having a weight ratio of 0.5% with respect to the polyurethane.
%, Similarly in Example 3 is 2%, in Example 4 is 5%, and in Example 5 is 10%. The comparative example is a high-pressure resin hose whose outer tube does not contain silicone and is made of only thermoplastic ether polyurethane.

Abrasion resistance is measured at the corners 13 of the tester shown in FIG.
The number of reciprocations of the corner portion 13 until the outer tube is worn and the reinforcing layer is exposed by rubbing the outer tube surface of the hose with the reciprocating motion of 10000 times. In this testing machine, the hose under test 11 is fixed through the shaft core 12,
The corner portion 13 comes into contact with the surface of the outer tube of the hose 11 to be pushed so as to be pushed by the weight 14, and the corner portion 13 is reciprocated by the cylinder 15 and the piston 16 via the arm 17, and the arm 17 is attached to the piston 16 by the pin 18. It is rotatably stopped by. The corner portion 13 forms an angle of 90 °, and the tip is an arc having a radius of 0.4 mm. Corner 13 is 1500g
The surface of the outer tube of the hose 11 to be tested is pressed with rf.

As is clear from Table 1, the examples have improved the abrasion resistance, that is, the abrasion resistance more than twice as compared with the comparative example of the prior art, and the abrasion resistance is almost constant when the silicon content is 2% or more. Becomes

[0017]

As described above, according to the present invention, since the thermoplastic resin containing silicone is used for the outer pipe to make it slippery, the coefficient of friction of the outer pipe becomes small and the wear resistance of the surface of the hose becomes remarkable. Improved. As a result, there is an effect that it can be used for a long period of time even in an environment where vibrations and vibrations are severe.

Further, since the thermoplastic resin such as ether polyurethane and the silicone mixed resin such as pellets are kneaded in the tuber and extruded by the tuber to form the outer tube, the high-pressure resin hose of the present invention can be easily manufactured. Moreover, there is an effect that it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a high-pressure resin hose of the present invention.

FIG. 2 is a schematic view of a manufacturing apparatus according to the manufacturing method of the present invention.

FIG. 3 is a schematic view of a testing machine used for a wear test of the high-pressure resin hose of the present invention.

[Explanation of symbols]

1 Outer pipe 5,9 Tuber 2 Inner pipe 6,7 Brader 3 Reinforcing layer 11 Tested hose 4 Middle layer 14 Corner

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C08L 75/08 NGJ C08L 75/08 NGJ F16L 11/08 F16L 11/08 B // B29K 75:00 105: 08 B29L 9:00 23:00

Claims (4)

[Claims] 1. A high-pressure resin hose having a reinforcing layer between an inner pipe and an outer pipe, wherein the outer pipe is made of a thermoplastic resin containing silicone. 2. The high-pressure resin hose according to claim 1, wherein the weight content of silicone is 0.5% to 10% with respect to the thermoplastic resin. 3. The high-pressure resin hose according to claim 1, wherein the thermoplastic resin is ether polyurethane. 4. A method for producing a high-pressure resin hose, comprising the steps of forming an inner pipe, forming a reinforcing layer on the inner pipe, and forming an outer pipe on the reinforcing layer with a tuber. In the tuber, thermoplastic resin and pellets,
Granular or powdery silicone mixed resin is inserted, the thermoplastic resin and the silicone mixed resin are kneaded in the tuber to produce a thermoplastic resin containing silicone, and the thermoplastic resin containing silicone is A method for producing a high-pressure resin hose, which comprises extruding the outer tube onto a reinforcing layer and molding the outer tube.