JP2002039448A - Easily sliding high pressure hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily sliding high pressure hose capable of being evenly taken up on a reel or the like with good taken-up appearance free from the unevenness, and drawn out from the reel or the like without the abrasion between hoses, and having superior storing workability and surface glossiness. SOLUTION: Aliphatic acid amide is blended into a rubber composition forming an outer tube of the high pressure hose composed of an inner tube, a reinforcement layer and the outer tube, and preferably paraffin wax is blended therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a windable, easy-to-slip, high-pressure hose.
The present invention relates to a slippery high-pressure hose which has excellent storage workability when wound on a reel or the like and has a good surface gloss.

[0002]

2. Description of the Related Art Generally, pressure is transmitted by hydraulic pressure,
The high-pressure hose for pumping high-pressure liquid has a structure in which an outer tube made of outer rubber is laminated on the outer periphery of an inner tube made of inner rubber via a reinforcing layer. Of these, civil engineering, high-pressure hoses for construction,
In particular, a tunnel excavation hose or the like is housed in a state wound on a reel, and is entirely or partially pulled out from the reel at the time of use, and wound up and housed again on the reel after use.
For this reason, it is desired that the winding shape on the reel is not uneven and average.

However, when the conventional high-pressure hose is wound on a reel again, friction occurs due to contact between the hoses.
The hose was wound up on a reel. That is, the average winding was not possible, and the workability of storage was extremely poor in order to avoid imbalance. Conversely, when the hose is pulled out from the reel, the tension of the hose due to its own weight, the bending of the hose at the bent part causes fatigue of the reinforcing steel wire, and the outer diameter due to repeated pressurization when used in the stored state There was also a problem that change, expansion and contraction occurred, and abrasion occurred due to friction between hoses.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reel and the like which can be wound up on average without any load, has excellent storage workability, has excellent durability against bending and elongation, and has low wear due to friction and the like. Another object of the present invention is to provide a slippery high-pressure hose having no surface gloss and good surface gloss.

[0005]

In order to achieve the object of the present invention, a slippery high-pressure hose according to the present invention is a high-pressure hose having a reinforcing layer provided between an inner pipe and an outer pipe, wherein the outer pipe has It is characterized by comprising a vulcanized rubber obtained by mixing 0.1 to 10 parts by mass of fatty acid amide with 100 parts by mass of rubber.

In a preferred high-slip slip hose of the present invention, the outer tube contains a fatty acid polyamide in an amount of 100 parts by mass of rubber.
1 to 10 parts by mass and 0.1 to 0.1 parts by mass of paraffin wax
It is characterized by being composed of vulcanized rubber mixed with 10 parts by mass.

A preferred slippery high-pressure hose of the present invention is characterized in that the fatty acid polyamide is a fatty acid monoalkylamide.

In a preferred slippery high-pressure hose of the present invention, the fatty acid polyamide is at least one selected from the group consisting of fatty acids stearoamide, oleylamide, erucylamide, laurylamide, palmitylamide, behenamide and methylolamide. It is characterized by.

In a preferred high-slidability high-pressure hose of the present invention, the rubber constituting the outer tube is styrene-butadiene copolymer rubber, butadiene rubber, butyl copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene copolymer rubber. −
It is characterized by containing at least one rubber selected from the group consisting of diene copolymer rubber, ethylene copolymer rubber, chloroprene rubber and acrylonitrile-butadiene copolymer rubber / vinyl chloride resin blend rubber as a main component.

Since the outer tube is made of a vulcanized rubber obtained by blending a fatty acid amide with rubber, when the hoses are wound on a reel or the like, even if the hoses come into contact with each other, the frictional resistance is small and it is easy to slip. The average winding is possible and the winding appearance is good. Also, fatty acid amides are less likely to cause bloom in rubber than internal lubricants such as other waxes,
Hose surface is not easily contaminated and surface gloss is good.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION
One example is a high-pressure hose in which a reinforcing layer is provided between an inner tube and an outer tube. One example is a tube in which the inner tube is made of a rubber composition, and a reinforcing steel wire is spirally wound around the inner tube. The first reinforcing layer is configured, the reinforcing steel wire is spirally wound in a direction opposite to the first reinforcing layer via an intermediate rubber layer on the outer periphery of the first reinforcing layer, and the second reinforcing layer is configured. The outer periphery of the second reinforcing layer is covered with an outer tube made of a cylindrical rubber composition.

The thickness of the inner tube is not particularly limited, and may be a normal thickness constituting a hose. The inner tube may be formed by appropriately selecting a suitable rubber composition from the viewpoint of oil resistance, chemical resistance, workability, and the like. As the raw rubber, butyl copolymer rubber, ethylene-propylene copolymer rubber,
Ethylene-propylene-diene copolymer rubber, chloroprene rubber, acrylonitrile-butadiene copolymer rubber (NBR), chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, hydrin rubber, ethylene-acrylate copolymer A rubber composition mainly composed of at least one kind of rubber selected from the group of synthetic rubbers such as polymerized rubber and hydrogenated acrylonitrile-butadiene copolymer rubber is exemplified. Further, if necessary, a mixture with a thermoplastic resin or a thermoplastic elastomer may be used.

[0013] The rubber composition of the present invention contains a conventional compounding agent (a reinforcing agent such as carbon black, a filler, a plasticizer, a softener,
Antioxidants, stabilizers, processing aids, vulcanizing agents such as sulfur,
Vulcanization accelerators, vulcanization retarders, etc.) and formulation.

The reinforcing layer may have a spiral structure of two or more layers in which a reinforcing steel wire is spirally wound around an inner tube, or a blade structure of one or more layers. Further, when there are a plurality of reinforcing phases made of reinforcing steel wires, it is preferable that a rubber sheet is interposed between the layers. The rubber sheet may be appropriately selected from a suitable rubber composition in consideration of adhesion to the reinforcing steel wire, sheet thickness, and the like. As the raw material rubber, for example, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene copolymer rubber, ethylene-propylene-
Examples include diene copolymer rubber, chloroprene rubber, acrylonitrile-butadiene copolymer rubber (NBR), and the like.
The reinforcing steel wire is preferably a reinforcing steel wire whose surface is plated with brass.

The thickness of the outer tube is not particularly limited, and may be a normal thickness constituting a hose. The outer tube may be appropriately selected and constructed from a suitable rubber composition from the viewpoints of weather resistance, abrasion resistance, workability, and the like. Raw material rubbers include styrene-butadiene copolymer rubber, butadiene rubber, butyl copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, ethylene copolymer rubber, chloroprene rubber, ethylene And synthetic rubbers such as acrylate copolymer rubber and acrylonitrile-butadiene copolymer rubber / vinyl chloride resin blend rubber. These may be used in combination of two or more. Further, if necessary, a mixture with a thermoplastic resin or a thermoplastic elastomer may be used.

Preferred rubbers are styrene-butadiene copolymer rubber, ethylene-propylene-diene copolymer rubber, ethylene copolymer rubber and acrylonitrile-butadiene copolymer rubber / vinyl chloride resin blend rubber. Acrylonitrile-butadiene copolymer rubber /
As the vinyl chloride resin blended rubber, a raw rubber previously blended may be used, or an acrylonitrile-butadiene copolymer rubber (NBR), a vinyl chloride resin and a compounding agent may be mixed with an appropriate mixer such as a Banbury mixer. It may be prepared.

The fatty acid amide compounded in the outer tube rubber is generally a polyalkylamide such as a monoalkylamide, monoarylamide or dialkylamide of a fatty acid, which is known as an internal mold release agent or a lubricant for rubber compounding. The fatty acid unit constituting the fatty acid amide is derived from a polycarboxylic acid having 5 to 50 carbon atoms, such as monocarboxylic acid or dicarboxylic acid. Preferred are monocarboxylic acids having 10 to 20 carbon atoms. The fatty acid may have an unsaturated group or may have a branch. The amine constituting the fatty acid amide is derived from ammonia.

The monoalkylamide of a fatty acid is generally composed of a higher fatty acid and a lower amine. Specifically, stearoamide, oxystearoamide, oleylamide, erucylamide, laurylamide, palmitylamide, behenamide, Methylolamide and the like. Preferred are stearoamide, oleylamide, laurylamide, palmitylamide. Fatty acid amides can be used as a mixture of two or more kinds.

The fatty acid amide is used in an amount of 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the raw rubber. There is no limitation on the particle size and particle size distribution of the fatty acid amide, and general ones are used. Fatty acid amides can also be incorporated into the inner tube. Internal release agent for rubber compounding,
When higher aliphatic alcohols, higher fatty acids or metal soaps known as lubricants are used, the effect of the present invention is not sufficiently exhibited.

When a paraffin wax is added to the outer tube in addition to the fatty acid amide, the surface gloss of the outer tube of the hose is improved. As the paraffin wax, a paraffin wax usually used for rubber compounding can be used. The compounding amount of the wax is 0.1% with respect to 100 parts by mass of the raw rubber.
10 to 10 parts by mass, preferably 0.2 to 5 parts by mass. It may be more or less than the coexisting fatty acid amide. The rubber composition of the present invention includes a usual compounding agent (a reinforcing agent such as carbon black, a filler, a plasticizer, a softener, an antioxidant, Agents, processing aids, vulcanizing agents such as sulfur, vulcanization accelerators, vulcanization retarders, etc.), and compounding formulations.

In the slippery high-pressure hose of the present invention, a reinforcing steel wire is spirally wound around the outer periphery of a cylindrical inner pipe made of unvulcanized rubber to form a first reinforcing layer, and the first reinforcing layer is formed. An intermediate rubber layer made of unvulcanized rubber is provided on the outer periphery of the layer, and a reinforcing steel wire is spirally wound around the outer periphery of the intermediate rubber layer in a direction opposite to the first reinforcing layer to form a second reinforcing layer. It is manufactured by laminating an outer tube made of unvulcanized rubber on the outer periphery of the reinforcing layer, forming a hose, performing a process such as ribbon wrapping, and then putting the vulcanized can into a vulcanized can and heating under pressure. Of course, it is not limited to the above. Vulcanization is carried out under normal vulcanization conditions for rubber.

Since the hose of the present invention has excellent slipperiness,
A high-pressure hose that requires slipperiness, particularly a high-pressure hose that transmits pressure by liquid pressure or pressure-feeds a liquid, and is suitably used as a high-pressure hose for civil engineering and construction wound up and stored on a reel or the like.

The present invention will be specifically described by way of examples, but the present invention is not limited to the examples. (Examples 1 to 4, Comparative Examples 1 to 6) The hoses of Examples and Comparative Examples having a nominal diameter of 19 were manufactured by the following methods. The inner tube was composed of an NBR rubber composition for inner tube rubber, and the intermediate rubber layer was composed of an NBR rubber composition for intermediate rubber. Outer diameter 19mm
On the mandrel of the above, NBR rubber composition for inner tube rubber,
It is extruded with a rubber extruder to a thickness of 1.8 mm. A brass-plated reinforcing steel wire with a diameter of 0.3 mm is wrapped around the outer periphery in a single spiral with almost no gap, and NBR rubber for intermediate rubber is placed on it. While inserting a sheet of the composition (thickness: 0.3 mm), the same reinforcing steel wire is further wound thereon in a single spiral in a direction opposite to the previous spiral with almost no gap, and the same rubber is placed thereon. The reinforcing steel wire was repeatedly wound while inserting the sheet, and the reinforcing steel wire formed four reinforcing layers. On this layer, a rubber composition for an outer tube containing an acrylonitrile-butadiene copolymer rubber / vinyl chloride resin blend rubber shown in Table 1 as a main component was used to form an outer layer having a thickness of 1.5 mm using a rubber extruder. A tube was formed to obtain a high pressure hose.

Next, the hose was subjected to ribbon wrapping, placed in a vulcanizing can, cooled at 150 ° C. for 60 minutes, and the wrapping tape was removed to obtain a vulcanized hose. The following evaluation was performed about the obtained hose, and the evaluation result was combined with Table 1 and shown.

[0025]

[Table 1]

The manufacturers and brands (trademarks) of the components constituting the rubber composition for outer tubes in Table 1 are described below. NBR (acrylonitrile-butadiene copolymer rubber) "Nipol 1043" manufactured by Zeon Corporation PVC (vinyl chloride resin) "103EP" manufactured by Zeon Corporation SRF grade carbon black "Asahi # 50" manufactured by Asahi Carbon Co., Ltd. Paraffin wax manufactured by Seiko Chemical Co., Ltd. "Sunite R" OD-3 (Anti-aging agent) "Seiko Chemical Co., Ltd.""NonflexOC" DOA (Dioctyladipate) Chisso Co., Ltd. "DOA" TS (Vulcanization Accelerator) Sanshin Chemical Co., Ltd. "Suncellar TS"

In the examples, the hose was evaluated as follows. (Slipperiness) Two fixed hoses each having a length of 400 mm were fixed in parallel to the support table in a state where they were in contact with each other. One movable hose having a length of 200 mm was placed at the center of the contact portion between the two fixed hoses, and was arranged so as to contact each fixed hose at two places. In this state, one end of the support was used as a fulcrum, and the other end was gradually lifted, and the angle of inclination (α) between the horizontal axis and the support when the movable hose began to slide was measured, and used as a measure of slipperiness. α is less than 10 ° ◎, more than 10 ° ○, 30
More than ° was marked as ×.

(Surface Gloss) The appearance of the hose surface is visually checked. The case where the surface is glossy is indicated by ◎, the case of matte (bleed) is indicated by ○, and the case where there is attached matter (bloom) is indicated.
Δ, when the bloom was severe, ×.

As shown in Table 1, the hose of the present invention certainly has excellent slipperiness as compared with a hose containing no fatty acid amide. Further, a hose further blended with paraffin wax has a good surface gloss.

[0030]

The hose of the present invention is a high-pressure hose in which a reinforcing layer is provided between the inner tube and the outer tube. Improved, no winding failure on reels due to stacking of hoses, good storage workability, less friction between hoses when pulled out from reels, less wear, durable, and surface gloss Is good.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08L 91/08 C08L 91/08 (72) Inventor Nasao Aoyagi 2-1 Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber F-term in Hiratsuka Factory (reference) 3H111 AA02 BA12 BA13 BA31 BA34 CC01 DA26 DB12 DB19 DB27 4J002 AC031 AC071 AC081 AC091 AE042 BB071 BB081 BB151 BB181 EP016 EP026 GT00

Claims (5)

[Claims] 1. A high pressure hose having a reinforcing layer provided between an inner tube and an outer tube, wherein the outer tube is made of vulcanized rubber obtained by mixing 0.1 to 10 parts by mass of fatty acid amide with 100 parts by mass of rubber. An easy-slip high-pressure hose characterized by the following: 2. The outer tube contains 0.1 to 10 parts by weight of a fatty acid amide and 0.1 to 10 parts by weight of a paraffin wax in 100 parts by weight of rubber.
2. The easy-slip high-pressure hose according to claim 1, comprising a vulcanized rubber blended with 1 to 10 parts by mass. 3. The slippery high-pressure hose according to claim 1, wherein the fatty acid amide is a fatty acid monoalkylamide. 4. The slippery skid according to claim 3, wherein the fatty acid amide is at least one selected from the group consisting of stearoamide, oleylamide, erucylamide, laurylamide, palmitylamide, behenamide and methylolamide. High pressure hose. 5. The rubber constituting the outer tube is composed of styrene-butadiene copolymer rubber, butadiene rubber, butyl copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, ethylene copolymer. 5. The method according to claim 1, wherein at least one kind of rubber selected from the group consisting of polymerized rubber, chloroprene rubber and acrylonitrile-butadiene copolymer rubber / vinyl chloride resin blend rubber is used as a main component. 2. A slippery high-pressure hose according to claim 1.