JP4778269B2 - Fluid transport tube - Google Patents

Description

  The present invention relates to a fluid transport tube having a special cross-sectional shape and excellent bending resistance, and more preferably, a fluid having the above-mentioned special cross-sectional shape and made of a specific material and excellent in moisture resistance and gas permeation resistance. It relates to a tube for transportation.

Tubes for fluid transportation used for gas transportation, chemicals, medical use, beverage transportation, etc. are required to be flexible so that fluid is not clogged even if the tube is bent to ensure stable fluid transportation. Yes. In order to improve the bending resistance, an improvement from a cross-sectional shape which is difficult to close is required, but the actual situation is that a satisfactory fluid transport tube has not yet been realized.
Patent Document 1 discloses a water supply / drainage hose comprising a fluid transport member having a flat closed tube shape with an arcuate cross section and a fixed member, and is expanded by water pressure during water supply / drainage to form a fluid flow path. The fluid transport member is composed of an elastomer and a fiber reinforcing layer, and the fixing member is composed of a sandwich structure in which a steel cord reinforcing layer is disposed on both sides of an elastomer-skid segment having an arcuate cross section. A fiber reinforced elastomer outer layer is integrally joined and coated on the outer peripheral surfaces of the fluid transporting member and the fixing member, but they are easily blocked when the tube is bent.
Further, in order to improve the bending resistance, it is required to use a highly flexible material, but the actual situation is that the improvement from this point of view has not been made sufficiently.

By the way, the fluid transport tube is required to have high gas permeation resistance from the viewpoints of safety and environmental problems, and is also required to have moisture resistance, gas resistance, corrosion resistance, and chemical resistance.
As materials for satisfying such required properties, vinyl chloride resin systems and silicone resin systems have been used so far, but these have some drawbacks and can be sufficiently satisfied. is not. For example, a vinyl chloride resin tube has a problem that a plasticizer bleeds and a problem that durability is low. In addition, although the silicone resin tube has excellent performance such as durability and chemical resistance, it has a problem of low mechanical strength (particularly tear strength) and high price.

In recent years, polystyrene-based heat represented by styrene-ethylene / propylene-block copolymer (SEPS), styrene-ethylene / butylene-styrene block copolymer (SEBS), and styrene-isobutylene-styrene block copolymer (SIBS). Plastic elastomers have been developed as tube materials.
However, these are excellent in mechanical strength and flexibility, but there is a problem that the water vapor permeability resistance and the gas permeability resistance are not always sufficient.
On the other hand, as a method of improving the gas permeation resistance of the rubber hose, for example, (1) a method of coating a nylon film on the inner surface of the rubber hose (see, for example, Patent Document 2), and (2) hose by covering the nylon inner tube with rubber (For example, refer patent document 3) etc. are disclosed.
However, none of these methods has sufficient gas permeation resistance, and there is a problem that it is difficult to continuously produce a rubber hose in particular with the method (1).
Further, although not a rubber hose, a method using an organosilane coating film as a gas barrier film to improve the gas permeation resistance of a plastic film is known (see, for example, Patent Documents 4 and 5).
However, it has been difficult to apply this method to a tube, a hose application or the like with a large deformation by using an organosilane coating film as a gas barrier film.

On the other hand, in the field of polymers, especially packaging film materials, methods for improving barrier properties include improvement of the molecular structure of the polymer, multi-layering such as dry lamination using an adhesive and extrusion lamination by a melt adhesion method. Known are nanocomposites in which inorganic compounds are finely dispersed in the order of nano-molecules, surface modification methods such as resin coating (emulsion method, resin method) and inorganic material coating (evaporation).
However, when this multilayering or nanocomposite technique is applied to, for example, the above-mentioned polystyrene-based thermoplastic elastomer base material, the flexibility of the thermoplastic elastomer may be impaired. It has been found that the resin is difficult to be fixed on the surface of the thermoplastic elastomer substrate.
As described above, the bending resistance is improved by improving the cross-sectional shape of the tube, and the gas permeation resistance and moisture resistance are improved by improving both the cross-sectional shape of the tube and the material used. There is a demand for further improving the flexibility.

JP-A-9-273669 JP 59-123661 A JP 60-11388 A Japanese Patent Laid-Open No. 62-112635 JP-A-2-286331

  An object of the present invention is to provide a fluid transport tube having a cross-sectional shape that is difficult to close and having excellent bending resistance, and more preferably, excellent gas permeability resistance, moisture resistance, gas resistance, It is to provide a fluid transport tube having both corrosion resistance and chemical resistance.

As a result of intensive studies to achieve the above object, the present inventor has found that the object can be achieved by improving the cross-sectional shape of the tube so as not to be blocked. In addition, a polymer composite obtained by subjecting a thermoplastic elastomer or a composition thereof as a raw material, or a polymer molded body obtained by using them to surface modification treatment such as corona discharge treatment and then attaching a metal vapor deposition film. It has been found that a more suitable object can be achieved by using the body. The present invention has been completed based on such findings.
That is, the present invention
(1) A fluid transport tube characterized by having a cross-sectional shape in which the neutral axis is located above the midpoint of the height of the cross-section of the tube.
(2) The fluid transport tube according to (1), comprising a thermoplastic elastomer or a composition containing the same.
(3) The method according to (1) above, wherein the surface of a polymer molded body comprising a thermoplastic elastomer or a composition containing the thermoplastic elastomer is subjected to a modification treatment, and the polymer composite is formed by attaching a metal vapor-deposited film to the surface. Tube for fluid transportation.
(4) The fluid transport tube according to (3), wherein the surface modification treatment is corona discharge treatment.
(5) The composition containing a thermoplastic elastomer is any one of the above (2) to (4), which is a composition in which 0.1 to 50 parts by mass of a polyolefin resin is blended with respect to 100 parts by mass of the thermoplastic elastomer. The fluid transport tube as described.
(6) The fluid transport tube according to any one of (2) to (5), wherein the thermoplastic elastomer is a polystyrene-based thermoplastic elastomer.
(7) The polystyrene-based thermoplastic elastomer is a styrene-isobutylene-styrene block copolymer (SIBS), a styrene-ethylene / butylene-styrene block copolymer (SEBS), or a styrene-ethylene / propylene-styrene block copolymer ( The fluid transport tube according to the above (6), which is at least one selected from the group consisting of SEPS.
(8) The fluid transport tube according to any one of (2) to (7), wherein the thermoplastic elastomer has a hardness of 80 degrees or less in accordance with JIS-A standards.
(9) The fluid transport tube according to any one of (3) to (8), wherein the metal deposition film is an aluminum deposition film or an aluminum alloy deposition film.
Is to provide.

  According to the present invention, a tube having excellent bending resistance can be obtained by having a cross-sectional shape that is difficult to close. Furthermore, it is possible to obtain a fluid transport tube suitable for fluid transport, which has excellent gas resistance, moisture resistance, gas resistance, corrosion resistance, chemical resistance and the like together with excellent bending resistance.

  The fluid transport tube of the present invention is characterized in that it has a cross-sectional shape in which the neutral axis is located above the midpoint of the height of the cross section of the tube, and will be described below with reference to the drawings. FIG. 1 shows a fluid transport tube 1 of the present invention having an inverted triangular shape. A neutral shaft 3 is present above the intermediate point 2 of the height 2a of the cross section of the tube 1. Here, the neutral axis refers to a horizontal axis that passes through the center of gravity 4 of the total cross-sectional area of the tube. Moreover, the high bending resistance of the tube means that the tube is not easily blocked even when the tube is bent.

Due to the above-described cross-sectional shape, even when the tensile stress is applied to the upper side (upper wall side) of the tube and the compressive stress is applied to the lower side (lower wall side), the lower wall and / or the lower side wall is curved. Since it is away from the neutral axis from the upper wall and / or the upper side wall, it is easy to bend and not to be blocked. Furthermore, since the cross-sectional shape of the lower side (lower wall side) of the tube is maintained, the lower side (lower wall side) supports the upper side (upper wall side), and it is difficult to block from this point.
Setting the neutral axis upward (upper wall side) can be achieved, for example, by inclining the side wall portion of the tube toward the lower wall in the inward direction. For example, a trapezoid with a lower wall length, a semicircular shape protruding downward, an inverted triangle, and the like can be given. The fluid transport tube of the present invention preferably has an upper wall portion, but the upper wall portion may be linear or non-linear, for example, a curved shape, such as an inverted triangle. The lower wall portion may not exist.

By the way, there is no restriction | limiting in particular as a thermoplastic elastomer used for the tube for fluid transportation of this invention, It selects suitably according to the use of a polymer composite_body | complex from conventionally well-known thermoplastic elastomers, From this viewpoint, a highly flexible material is preferable. Examples of the thermoplastic elastomer include polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, polydiene-based thermoplastic elastomers, polyvinyl chloride-based thermoplastic elastomers, chlorinated polyethylene-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, and polyesters. Based thermoplastic elastomers, polyamide based thermoplastic elastomers, fluororesin based thermoplastic elastomers, and the like.
In the present invention, these thermoplastic elastomers may be used singly or in combination of two or more, but particularly from the viewpoint of balance between physical properties and processability, etc. A plastic elastomer is preferred.

A polystyrene-based thermoplastic elastomer has an aromatic vinyl polymer block (hard segment) and a rubber block (soft segment), and the aromatic vinyl polymer portion forms a physical cross-link and serves as a crosslinking point. The rubber block gives elasticity.
Examples of the aromatic vinyl-based compound forming the aromatic vinyl-based polymer block include styrene; α-alkyl-substituted styrene such as α-methylstyrene, α-ethylstyrene, α-methyl-p-methylstyrene; o- Methyl styrene, m-methyl styrene, p-methyl styrene, 2,4-dimethyl styrene, ethyl styrene, 2,4,6-trimethyl styrene, ot-butyl styrene, pt-butyl styrene, p-cyclohexyl styrene Nuclear alkyl-substituted styrene such as o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, p-bromostyrene, 2-methyl-4-chlorostyrene and the like halogenated styrene; 1-vinylnaphthalene and the like vinylnaphthalene Derivatives; indene derivatives; divinylbenzene and the like.
Among these, styrene, α-methylstyrene, and p-methylstyrene are preferable, and styrene is particularly preferable.
These aromatic vinyl compounds may be used individually by 1 type, and may be used in combination of 2 or more type.

This polystyrene-based thermoplastic elastomer has a styrene-butadiene-styrene block copolymer (SBS), a styrene-isoprene-styrene block copolymer (SIS), and a styrene-isobutylene-styrene block depending on the arrangement pattern of the soft segments therein. Copolymer (SIBS), Styrene-ethylene / butylene-styrene block copolymer (SEBS), Styrene-ethylene / propylene-block copolymer (SEPS), Block copolymer of polybutadiene and butadiene-styrene random copolymer A block copolymer of crystalline polyethylene and ethylene / butylene-styrene random copolymer obtained by hydrogenating the polymer, or a block copolymer of polybutadiene or ethylene-butadiene random copolymer and polystyrene are hydrogenated. Is, for example, there is such diblock copolymer of crystalline polyethylene and polystyrene.
Among these, styrene-isobutylene-styrene block copolymer (SIBS), styrene-, in terms of mechanical strength, gas permeation resistance, heat stability, weather resistance, chemical resistance, flexibility, workability, and the like. Ethylene / butylene-styrene block copolymers (SEBS) and styrene-ethylene / propylene-block copolymers (SEPS) are preferred. The content of the styrene block in these styrene elastomers is preferably 10 to 70% by mass, and more preferably in the range of 20 to 40% by mass.

The thermoplastic elastomer preferably has a hardness of 80 degrees or less in accordance with JIS-A standards. When the hardness is 80 degrees or less, sufficient flexibility as a molded body can be obtained. In view of the above, the hardness is more preferably 70 degrees or less and particularly preferably 60 degrees or less in the JIS-A standard.
The weight average molecular weight of the thermoplastic elastomer is not particularly limited, but from the viewpoint of gas permeation resistance, mechanical properties, moldability, etc., it is preferably in the range of 40,000 to 120,000, Furthermore, the range of 60,000-100,000 is preferable.

Moreover, as a composition containing a thermoplastic elastomer (hereinafter sometimes referred to as “elastomer composition”), various components other than the thermoplastic elastomer can be blended. From the viewpoint of improving processability and heat resistance, resin components such as polyolefin resins and polystyrene resins (hereinafter sometimes simply referred to as “resin components”) can be preferably mentioned, and polyolefin resins are particularly preferable.
The polyolefin resin is not particularly limited. For example, polyethylene, isotactic polypropylene, a copolymer of propylene and a small amount of other α-olefin (for example, propylene-ethylene copolymer, propylene / 4-methyl-1- Pentene copolymer), poly (4-methyl-1-pentene), polybutene-1, and the like. When isotactic polypropylene or a copolymer thereof is used as the polyolefin resin, those having an MFR (JIS K7210) of 0.1 to 50 g / 10 min, particularly 0.5 to 30 g / 10 min can be preferably used. .
In addition, the thermoplastic elastomer contained in an elastomer composition can be used individually by 1 type and in combination of 2 or more types.

Next, as a polystyrene resin, what was obtained by the conventionally well-known manufacturing method, for example, what was obtained by any of the radical polymerization method and the ionic polymerization method, can be used conveniently.
The number average molecular weight of the polystyrene resin used here is preferably selected from the range of 5,000 to 500,000, more preferably 10,000 to 200,000, and the molecular weight distribution is preferably 5 or less.
Examples of the polystyrene resin include polystyrene, a styrene-butadiene block copolymer having a styrene unit content of 60% by mass or more, rubber-reinforced polystyrene, poly α-methylstyrene, poly pt-butylstyrene, and the like. You may use together 1 type, or 2 or more types.
Furthermore, a copolymer obtained by polymerizing a mixture of monomers constituting these polymers can also be used.
Moreover, the said polyolefin resin and polystyrene resin can also be used together.
For example, when these resins are added to the elastomer composition, when a polystyrene resin is used in combination as compared with the case where a polyolefin resin alone is added, the hardness of the resulting molded product tends to increase.
Therefore, the hardness of the obtained molded body can be adjusted by selecting these blending ratios.
In this case, the ratio of polyolefin resin / polystyrene resin is preferably selected from the range of 95/5 to 5/95 (mass ratio).

The compounding amount of the resin component in the elastomer composition is preferably about 0 to 100 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer. For example, in the case of a polyolefin resin, 0.1 to 50 parts by mass is particularly preferable. Is more preferable.
When the blending amount of the resin component is 100 parts by mass or less, it is preferable that the hardness of the obtained molded body does not become too high.

A softening agent can be further added to the elastomer composition. As the softening agent, usually a liquid or liquid one is suitably used at room temperature.
The softener having such properties can be appropriately selected from, for example, various rubber or resin softeners such as mineral oil and synthetic.
Here, examples of mineral oils include process oils such as naphthenic and paraffinic oils. Among them, non-aromatic oils, particularly mineral oil-based paraffinic oils, naphthenic oils, or synthetic polyisobutylene-based oils. One or two or more selected from oils having a number average molecular weight of 450 to 5,000 is preferable.
In addition, these softeners may be used individually by 1 type, and may mix and use 2 or more types if mutual compatibility is favorable.
Although the compounding quantity of a softener does not have a restriction | limiting in particular, It is 1-1000 mass parts normally with respect to 100 mass parts of thermoplastic elastomers, Preferably it is chosen in the range of 1-500 mass parts.
When the blending amount is 1 part by mass or more, the hardness can be reduced, and sufficient flexibility can be obtained when a molded body such as a tube is formed. On the other hand, if it is 1,000 parts by mass or less, bleeding of the softening agent can be suppressed, and sufficient mechanical strength of the molded product can be obtained.
In addition, the compounding quantity of this softening agent can be suitably selected in the said range according to the molecular weight of a thermoplastic elastomer, and the kind of other component added to this thermoplastic elastomer.

The elastomer composition can be blended with a polyphenylene ether resin as desired for the purpose of improving the compression set of the resulting molded article.
As the polyphenylene ether resin, known ones can be used. Specifically, poly (2,6-dimethyl-1,4-phenylene ether), poly (2-methyl-6-ethyl-1,4- Phenylene ether), poly (2,6-diphenyl-1,4-phenylene ether), poly (2-methyl-6-phenyl-1,4-phenylene ether), poly (2,6-dichloro-1,4-phenylene ether) And a polyphenylene such as a copolymer of 2,6-dimethylphenol and a monovalent phenol (for example, 2,3,6-trimethylphenol or 2-methyl-6-butylphenol). Ether copolymers can also be used.
Of these, poly (2,6-dimethyl-1,4-phenylene ether) and a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferable. Dimethyl-1,4-phenylene ether) is preferred.
The compounding quantity of polyphenylene ether resin can be suitably selected in the range of 10-250 mass parts with respect to 100 mass parts of thermoplastic elastomers.
When the blending amount is 250 parts by mass or less, the hardness of the obtained molded article does not become too high and becomes moderate, and when it is 10 parts by mass or more, the effect of improving the compression set of the obtained molded article is sufficient.

Further, the elastomer composition used in the fluid transport tube of the present invention includes clay, diatomaceous earth, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxide, mica, graphite, aluminum hydroxide, etc. Inorganic inorganic additives, various metal powders, glass powders, ceramic powders, granular or powdered solid fillers such as granular or powder polymers, other various natural or artificial short fibers, long fibers (various polymer fibers, etc. Etc.) can be blended.
Moreover, weight reduction can be achieved by mix | blending the hollow filler, for example, organic hollow fillers, such as inorganic hollow fillers, such as a glass balloon and a silica balloon, a polyvinylidene fluoride, a polyvinylidene fluoride copolymer.
Furthermore, in order to improve various physical properties such as weight reduction, it is possible to mix various foaming agents, and it is also possible to mix gas mechanically during mixing.

  In addition, the elastomer composition used in the fluid transportation tube of the present invention may include other additives such as a flame retardant, an antibacterial agent, a hindered amine light stabilizer, an ultraviolet absorber, an antioxidant, and a coloring agent. Agents, silicone oil, silicone polymer, coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, rosin derivatives, etc. Adhesive elastomers such as HIBLER (trade name: manufactured by Kuraray Co., Ltd., block copolymer in which polystyrene blocks are connected to both ends of a vinyl-polyisoprene block), Norex (trade name: manufactured by Nippon Zeon Co., Ltd.) , Polynorbornene obtained by ring-opening polymerization of norbornene) and other thermoplastic resins Etc. may be used in combination Sutoma or resin.

The silicone polymer has a weight average molecular weight of 10,000 or more, preferably 100,000 or more. The said silicone polymer improves the surface adhesiveness of the molded object using the said elastomer composition.
As the silicone polymer, a general-purpose thermoplastic polymer such as polyethylene, polypropylene, or polystyrene blended at a high concentration can be used in order to improve the handleability.
In particular, a blended product with polypropylene has good workability and physical properties.
As such a material, for example, a material readily available as a silicone concentrate BY27 series general-purpose type commercially available from Toray Dow Corning Silicone Co., Ltd. may be used.

The manufacturing method of the said elastomer composition is not specifically limited, A well-known method is applicable.
For example, each of the above components and optional additive components are melt-kneaded using a heating kneader, for example, a single screw extruder, twin screw extruder, roll, Banbury mixer, plastic bender, kneader, high shear mixer, etc. Furthermore, it can be easily produced by adding a crosslinking agent such as an organic peroxide, a crosslinking aid or the like, if necessary, or mixing these necessary components at the same time, followed by heating, melt-kneading.
In addition, a thermoplastic material prepared by kneading a polymer organic material and a softener is prepared in advance, and this material is further mixed with one or more types of polymer organic materials that are the same type or different from those used here. You can also
Furthermore, the elastomer composition can be crosslinked by adding a crosslinking agent such as an organic peroxide, a crosslinking aid or the like.

The polymer composite used in the fluid transport tube of the present invention uses the above-described thermoplastic elastomer or a composition containing the same, and is formed into a tube or sheet by a conventionally known method such as extrusion molding, injection molding, or inflation. It can be obtained by preparing a polymer molded body such as a shape and subjecting the surface thereof to a modification treatment, and then attaching a metal vapor deposition film to the surface.
Examples of the surface modification treatment applied to the polymer molded body include corona discharge treatment, plasma treatment, hot air treatment, flame treatment, ozone-ultraviolet irradiation treatment, chromic acid treatment and solvent treatment (wet), and primer treatment. In view of operability and effects, corona discharge treatment and plasma treatment are preferable, and corona discharge treatment is particularly preferable. By these surface modification treatments, adhesion with a metal vapor deposition film provided on the surface is improved.

As the plasma processing method, for example, a low-temperature plasma processing method described in “HV Boening, Fundamentals of Plasma Chemistry and Technology, Technology Publishing” or the like can be used.
In this case, the low temperature plasma treatment is performed at a pressure of 0.133 Pa (1 mTorr) or more, preferably a pressure of 1.33 to 133.3 Pa (10 to 1000 mTorr), a frequency of 100 kHz to 10 GHz, preferably 200 kHz to 100 MHz and a power of 0.01 to 100 MHz. 100W / cm ^2, preferably 0.05~5W / cm ² of RF power, plasma irradiation time of 1 second to 10 minutes, preferably at a condition of 3 seconds to 5 minutes.
Further, as the atmospheric gas, argon, oxygen, nitrogen, air, helium, CF _{4 and the} like are preferable.

In the case of corona discharge treatment, as long as corona discharge occurs, direct current or alternating current may be used. In the case of alternating current, any frequency up to a high frequency may be used, but preferably 1 kHz to 500 kHz, power is 0.5 W / cm ² or more, Preferably, it can be carried out under conditions of 5 to 500 W / cm ² , a treatment speed of 0.05 to 100 m / min, preferably 0.1 to 5 m / min, and is usually carried out in air at atmospheric pressure. Although it is preferable, it is not limited to this.

Various types of metal vapor deposition films to be bonded to the surface-treated polymer molded body are used. In the present invention, a film on which aluminum or an aluminum alloy is vapor-deposited is preferably used.
Although it does not specifically limit as a base film which vapor-deposits aluminum etc., A thermoplastic resin film etc. are generally used. As the thermoplastic resin film, conventionally known film materials can be used. For example, polyethylene, polypropylene, a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and (meth) acrylic acid, Examples thereof include a copolymer of ethylene and (meth) acrylic acid ester. Here, (meth) acrylic acid means acrylic acid or methacrylic acid.
The thickness of the base film is appropriately selected depending on the application, but is usually in the range of 10 nm to 100 μm.

  Moreover, in this invention, an aluminum alloy is an alloy of aluminum and another metal, Comprising: The metal which forms an alloy with aluminum will not be specifically limited if an alloy can be formed. Specific examples include an aluminum-copper alloy, an aluminum-manganese alloy, an aluminum-silicon alloy, an aluminum-magnesium alloy, an aluminum-magnesium-silicon alloy, and an aluminum-zinc-magnesium alloy.

  The method for depositing aluminum or an aluminum alloy on the substrate film is not particularly limited, and for example, vacuum deposition, sputtering, ion plating, or the like can be used. About the thickness of a vapor deposition film, although it can select suitably according to a use, it is the range of 400-600A normally.

Various methods can be used as a method of attaching a metal vapor-deposited film to a polymer molded body to obtain a polymer composite used in the fluid transport tube of the present invention. For example, a method in which a metal vapor-deposited film is pasted on the modified surface of the polymer molded body that has been subjected to surface modification treatment such as corona discharge treatment, and is attached by applying a temperature of about 200 ° C. through a hot roll machine. It is mentioned in.
Moreover, when a metal vapor deposition film is affixed to a tube-shaped polymer molded body, it can be affixed either on the outside or on the inside of the tube.

The polymer composite used for the fluid transport tube of the present invention thus obtained has an air permeability measured using a 0.5 mm thick sheet [JIS K7126; method A (differential pressure method), 40 [° C.] is usually 200 × 10 ⁻⁵ cm ³ / m ² · 24 hr · Pa or less, and has excellent gas permeation resistance. The air permeability is preferably 100 × 10 ⁻⁵ cm ³ / m ³ · 24 hr · Pa or less, more preferably 5 × 10 ⁻⁵ cm ³ / m ² · 24 hr · Pa or less, and further preferably 1 × 10 ^{− 5} cm ³ / m ² · 24 hr · Pa or less.
Furthermore, the water vapor permeability measured using a 0.5 mm thick sheet [JIS Z0208; 40 ° C., 90% RH] is usually 2.0 g / m ² · 24 hr or less, and also has a barrier property against water vapor. Are better. The water vapor permeability is preferably 1.5 g / m ² · 24 hr or less, more preferably 1.2 g / m ² · 24 hr or less, and still more preferably 1.0 g / m ² · 24 hr.
Moreover, although the cross-sectional area of the hollow part of the tube for fluid transportation of this invention is suitably selected by a use, it is about 0.01-40 mm < ² > normally, Preferably it is 0.5-15 mm < ² >. The wall thickness is usually about 0.1 to 2 mm, preferably 0.5 to 1.5 mm, although it depends on the cross-sectional area of the hollow portion.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
(Evaluation methods)
(1) Peelability of metal vapor deposition film: Evaluation was made by the behavior when the resin layer and metal vapor deposition film were pulled by hand at an angle of approximately 180 degrees. Evaluation was performed according to the following criteria.
○: The metal vapor-deposited film did not peel ×: The metal vapor-deposited film was peeled off with little force applied (2) Moisture resistance: 40 ° C. and 90% RH for a sheet having a thickness of 0.5 mm according to JIS Z0208 Measured under conditions.
(3) Gas permeation resistance: Measured for a sheet having a thickness of 0.5 mm according to JIS K7126 A method (differential pressure method) 40 ° C.
(4) Bending resistance: Evaluation was made by the behavior when a tube (length 30 cm) with a deposited film was bent repeatedly. Evaluation was performed according to the following criteria.
A: The tube was not clogged and the metal vapor deposited film was not peeled off.
○: The tube was partially blocked, and a part of the metal deposited film was slightly peeled off.
X: Clogging of the tube occurred over a wide range, and the metal vapor deposited film peeled over a wide range.

Production Example 1
Using styrene-isobutylene-styrene block copolymer [SIBS: weight average molecular weight Mw = about 70,000, styrene block content 30 mass%], injection molding is carried out at a mold temperature of 80 ° C. and a resin temperature of 170 ° C. And the sheet | seat of thickness 0.5mm was produced. The sheet surface was subjected to corona discharge treatment in air at atmospheric pressure under conditions of a frequency of 50 kHz, a power of 2 W / cm ² , and a treatment speed of 1 m / min.
Next, an aluminum vapor-deposited film ("Eval Film VM-XL" manufactured by Kuraray Co., Ltd., thickness 12 μm) is thermocompression bonded to the surface of the surface-modified sheet at about 200 ° C using a hot roll machine, A polymer composite was produced. About the obtained polymer composite, the peelability, moisture resistance, and gas permeability resistance of the metal vapor deposition film were implemented based on the said evaluation method. The results are shown in Table 1.

Production Example 2
Instead of SIBS, a styrene-ethylene / propylene block copolymer [SEPS: weight average molecular weight Mw = about 70,000, styrene block content 30 mass%] was used in the same manner as in Production Example 1. A polymer composite was produced. About the obtained polymer composite, the peelability, moisture resistance, and gas permeability resistance of the metal vapor deposition film were implemented based on the said evaluation method. The results are shown in Table 1.

Production Example 3
It replaced with SIBS and it carried out similarly to manufacture example 1 except having used the elastomer composition which mixed SIBS and polypropylene ("Novatec BC05B" by Nippon Polyolefin Co., Ltd.) in the ratio of 9: 1 (mass ratio). A polymer composite was produced. About the obtained polymer composite, the peelability, moisture resistance, and gas permeability resistance of the metal vapor deposition film were implemented based on the said evaluation method. The results are shown in Table 1.

Production Example 4
In Production Example 1, a polymer composite was produced in the same manner as Production Example 1 except that the corona discharge treatment was not performed. About the obtained polymer composite, the peelability, moisture resistance, and gas permeability resistance of the metal vapor deposition film were implemented based on the said evaluation method. The results are shown in Table 1.

Production Example 5
In Production Example 2, a polymer composite was produced in the same manner as in Production Example 2 except that the corona discharge treatment was not performed. About the obtained polymer composite, the peelability, moisture resistance, and gas permeability resistance of the metal vapor deposition film were implemented based on the said evaluation method. The results are shown in Table 1.

Production Example 6
In Production Example 3, a polymer composite was produced in the same manner as Production Example 3 except that the corona discharge treatment was not performed. About the obtained polymer composite, the peelability, moisture resistance, and gas permeability resistance of the metal vapor deposition film were implemented based on the said evaluation method. The results are shown in Table 1.

  The polymer composites of Production Examples 1 to 6 were all excellent in gas resistance, corrosion resistance, chemical resistance, and the like.

Examples 1-24 and Comparative Examples 1-18
The tubes of Examples 1 to 4 and Comparative Examples 1 to 3 were produced using the 30 cm long tubes having the shape numbers 1 to 7 shown in Table 2 using the polymer composite of Production Example 1. Similarly, the tubes of Examples 5 to 8 and Comparative Examples 4 to 6 were used in the shapes of the shape numbers 1 to 7 using the polymer composite of Production Example 2, and the polymer composite of Production Example 3 was used. The tubes of Examples 9 to 12 and Comparative Examples 7 to 9, the polymer composite of Production Example 4 were used, and the tubes of Examples 13 to 16 and Comparative Examples 10 to 12 were made of the polymer composite of Production Example 5. The tubes of Examples 17 to 20 and Comparative Examples 13 to 15 were prepared using the polymer, and the tubes of Examples 21 to 24 and Comparative Examples 16 to 18 were prepared using the polymer composite of Production Example 6. All tubes were prepared so that the mass per unit length was equal.
In addition, the sizes of the tubes having the shape numbers 1 to 7 (represented by the cross-sectional area mm ² × average wall thickness mm of the hollow portion) are 1: 1.5 × 1.2 and 2: 2.0 × 1.2, respectively. 3: 2.0 × 1.5, 4: 2.0 × 1.5, 5: 2.0 × 1.2, 6: 2.0 × 1.5, 7: 2.5 × 1.2 Met.

  The bending resistance of the obtained tube was evaluated based on the above evaluation method. The results are shown in Table 3. None of the tubes of Examples 1 to 12 were clogged, and the metal deposited film was not peeled off. In all the tubes of Examples 13 to 24, the tube was partially clogged, and a part of the metal vapor deposited film was slightly peeled off. In the tubes of Comparative Examples 1 to 18, blockage of the tube occurred over a wide range, and the metal vapor deposited film peeled over a wide range.

  Since the fluid transportation tube of the present invention has excellent bending resistance, it is suitably used as a fluid transportation tube for refrigerant transportation, gas transportation, chemicals, medical use, beverage transportation, and the like.

It is a cross-sectional schematic diagram of the tube for fluid transportation of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid transport tube 2 of the present invention Intermediate point of cross section height 3 Neutral shaft 4 Center of gravity

Claims (6)

A fluid transport tube comprising a polystyrene-based thermoplastic elastomer having a hardness of 60 degrees or less according to JIS-A standards or a composition containing the same, wherein the polystyrene-based thermoplastic elastomer is a styrene-isobutylene-styrene block copolymer ( SIBS), at least one selected from the group consisting of styrene-ethylene / butylene-styrene block copolymer (SEBS) and styrene-ethylene / propylene-styrene block copolymer (SEPS),
A fluid transporting tube, characterized in that the neutral axis has a cross-sectional shape (excluding an oval cross-sectional shape) located above the midpoint of the tube cross-section height.   The fluid according to claim 1, comprising a polymer composite in which a surface of a polymer molded body made of the polystyrene-based thermoplastic elastomer or a composition containing the same is subjected to a modification treatment, and a metal vapor deposition film is adhered to the surface. Transport tube.   The fluid transport tube according to claim 2, wherein the surface modification treatment is corona discharge treatment.   The composition for transportation of fluid according to claim 2 or 3, wherein the composition containing the polystyrene-based thermoplastic elastomer is a composition in which 0.1 to 50 parts by mass of a polyolefin resin is blended with 100 parts by mass of the polystyrene-based thermoplastic elastomer. tube.   The fluid transport tube according to any one of claims 2 to 4, wherein the metal deposition film is an aluminum deposition film or an aluminum alloy deposition film.   The fluid transport tube according to any one of claims 1 to 5, wherein the polystyrene-based thermoplastic elastomer has a weight average molecular weight of 60,000 to 100,000.

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