JP2003012865A - Styrene-based thermoplastic elastomer composition and weather-resistant flexible hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hose having both flexibility and weather resistance, and suitably applicable especially to a use for cold- and hot-water supply piping of a systematically equipped kitchen, wash toilet stand, toilet, toilet washing stool sheet, water storage tank for a heating use, and the like. SOLUTION: The objective styrene-based thermoplastic elastomer composition contains a styrene-based thermoplastic elastomer consisting of a vinyl-isoprene phase hydrogenated product of a styrene-vinyl-isoprene triblock copolymer (hereinafter referred to as a hydrogenated styrene-butadiene rubber) as a soft segment and a polypropylene as a hard segment, and a light-resistant agent. The mixed ratio, by mass, of the hydrogenated styrene butadiene rubber to polypropylene is 60-80:20-40, and the weather-resistant flexible hose is obtained by using the elastomer composition for the outer layer thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a styrene-based thermoplastic elastomer composition having both flexibility and weather resistance and a weather resistant flexible hose, and particularly to a system kitchen exposed to sunlight, a vanity, a toilet, a cleansing toilet seat, The present invention relates to a styrene-based thermoplastic elastomer composition and a weather resistant flexible hose suitable as a pipe for supplying hot and cold water such as a water tank for heating.

[0002]

2. Description of the Related Art Conventionally, a system kitchen, a vanity,
Water tank for toilet, water tank for heating, other water supply
Copper pipes and stainless steel bellows pipes are widely used at the final connection part between hot water supply and tap water supply pipes for hot water or tap water It has been commonly used.

However, in the case of these pipes, there is a problem that they are poor in flexibility and inferior in pipe workability, which deteriorates the workability of the pipe work at the time of installing a sink or a sink. There is.

Therefore, recently, for the purpose of improving piping workability, a reinforcing layer made of stainless steel wire or the like is provided on an elastic inner tube made of rubber or a thermoplastic elastomer, and the reinforcing layer is made of various thermoplastic elastomers. Flexible hoses coated with an outer layer have been proposed. However, in the case of this flexible hose, it is inferior in weather resistance, and cracks when used in a system kitchen exposed to sunlight, a vanity, a toilet, etc. As a result, the durability and pressure resistance of the flexible hose deteriorate. However, there is a problem that there is a risk of corrosion rupture.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the various problems in the prior art and achieve the following objects. That is, the present invention has both flexibility and weather resistance, and particularly a system kitchen exposed to sunlight, a vanity,
An object of the present invention is to provide a styrene-based thermoplastic elastomer composition and a weather resistant flexible hose suitable as a pipe for hot and cold water supply such as a toilet, a cleansing toilet seat, and a water storage tank for heating.

[0006]

To solve the above problems, the present invention provides the following styrene-based thermoplastic elastomer composition and weather resistant flexible hose.

According to the invention of claim 1, a hydrogenated product of a vinyl-isoprene phase of a styrene-vinyl-isoprene-triblock copolymer (hereinafter abbreviated as water-added styrene butadiene rubber) as a soft segment and polypropylene as a hard segment. A styrene-based thermoplastic elastomer containing, and a styrene-based thermoplastic elastomer composition containing a light-proofing agent, wherein the mixing ratio of water-added styrene-butadiene rubber and polypropylene in the styrene-based thermoplastic elastomer is in a mass ratio. Water-added styrene butadiene rubber: polypropylene = 60-8
It is 0: 20-40, It is a styrene-type thermoplastic elastomer composition characterized by the above-mentioned.

According to a second aspect of the present invention, the mixing ratio of water-added styrene-butadiene rubber and polypropylene in the styrene-based thermoplastic elastomer is water-added styrene-butadiene rubber: polypropylene = 65-75: 2.
The styrene-based thermoplastic elastomer composition according to claim 1, which is 5 to 35.

According to a third aspect of the present invention, the amount of the light-proofing agent is 0.5 to 0.5 based on the total amount of the styrene-based thermoplastic elastomer composition.
The styrene-based thermoplastic elastomer composition according to claim 1, which is 4% by mass.

According to a fourth aspect of the present invention, an inner tube formed of rubber or a thermoplastic elastomer, a reinforcing layer formed by braiding one or more layers of reinforcing fiber on the outer peripheral surface of the inner tube, and the reinforcing layer are covered. A weather-resistant flexible hose having an outer surface layer, wherein the outer surface layer is formed of the styrene-based thermoplastic elastomer composition according to any one of claims 1 to 3. is there.

The invention of claim 5 is used as a pipe for hot and cold water supply, such as a system kitchen, a vanity, a toilet, a toilet seat, a water storage tank for heating, etc. It is a flexible hose.

According to the present invention, a hydrogenated product of a vinyl-isoprene phase of a styrene-vinyl-isoprene-triblock copolymer (hereinafter abbreviated as water-added styrene-butadiene rubber) is used as a soft segment and polypropylene is used as a hard segment. By using a styrene-based thermoplastic elastomer composition containing a styrene-based thermoplastic elastomer containing a light-proofing agent in the outer surface layer of a hose having an inner tube, a reinforcing layer and an outer surface layer, excellent flexibility and weather resistance can be obtained. In particular, it can be suitably used as a pipe for hot and cold water supply, such as a system kitchen exposed to sunlight, a vanity, a toilet, a toilet seat, a water storage tank for heating, and the like.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. [Styrene-based thermoplastic elastomer composition] The styrene-based thermoplastic elastomer composition of the present invention comprises a vinyl-isoprene phase hydrogenated product of a styrene / vinyl-isoprene / triblock copolymer as a soft segment (hereinafter referred to as water-added styrene. (Abbreviated as butadiene rubber) and polypropylene as a hard segment.

The mixing ratio of water-added styrene-butadiene rubber and polypropylene in the styrene-based thermoplastic elastomer is water-added styrene-butadiene rubber: polypropylene = 60-80: 20-40, and preferably water-added styrene-butadiene. Rubber: polypropylene = 65-75: 25-35, most preferably water-added styrene butadiene rubber: polypropylene = 7
It is 0:30. When the amount of the water-added styrene-butadiene rubber is less than 60% by mass in the mixing ratio of the water-added styrene-butadiene rubber and polypropylene, the flexibility is impaired. On the other hand, if it exceeds 80% by mass, the cost will increase.

As such a water-added styrene-butadiene rubber, commercially available products can be used, and for example, Dynaron 1320P, Dynaron 2324P and the like are suitable.

The light stabilizer is not particularly limited as long as it can impart light resistance and improve weather resistance. For example, UVA (Tinuvin 326), HAS.
(LA52) and the like.

The amount of the light stabilizer added is preferably 0.5 to 4 with respect to the entire styrene thermoplastic elastomer composition.
%, More preferably 0.5 to 2% by weight, most preferably 1% by weight. If the amount of the light-resistant agent is less than 0.5% by mass, the effect of improving the weather resistance may not be sufficiently exhibited, while if it exceeds 4% by mass, the cost may increase.

In addition to the water-added styrene-butadiene rubber and the light-proofing agent, the styrene-based thermoplastic elastomer composition of the present invention may optionally contain an antioxidant, an antioxidant, etc. within a range not impairing the object of the present invention. Additives such as a deterioration agent can be added.

[Flexible weather resistant hose] As an example, the flexible weather resistant hose of the present invention includes an inner tube 2 formed of rubber or a thermoplastic elastomer and an outer peripheral surface of the inner tube, as shown in FIG. And a reinforcing layer 3 braided with one or more layers of reinforcing fibers (stainless steel wire or reinforcing yarn (polyester yarn, etc.)), and an outer surface layer 4 covering the reinforcing layer.

The material of the inner tube is not particularly limited as long as it has elasticity and can be appropriately selected according to the purpose, but a high molecular polymer is preferable. Examples of the high-molecular polymer include rubber and thermoplastic resin, and among these, rubber is preferable. The materials may be used alone or in combination of two or more. The thickness of the inner tube is not particularly limited and can be appropriately selected depending on the purpose.

The method for forming the inner tube is not particularly limited, and a known method can be adopted.
Examples thereof include a method of coating and forming an inner tube having a desired wall thickness using an extruder or the like.

Reinforcing fibers are braided on the inner pipe to form a reinforcing layer. The reinforcing fiber is not particularly limited and may be appropriately selected depending on the purpose, for example, iron,
Examples include simple metals such as copper and aluminum, alloys such as stainless steel, and reinforcing threads such as polyester threads.
These may be used alone or in combination of two or more.

The diameter of the reinforcing fiber is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably small, specifically 0.2 to 0.8 mm.
A degree is preferable. When the diameter is less than 0.2 mm,
When braiding the inner tube, the reinforcing fibers easily bite into the inner tube, and the reinforcing fiber itself may be broken due to a large tension during braiding, and when it exceeds 0.8 mm, It may be difficult to braid the inner tube.

The material of the adhesive layer is not particularly limited and may be appropriately selected depending on the type of material of the inner tube, the type of material of the reinforcing fiber, and the like. For example, rubber or thermoplastic resin. And the like, and the thermoplastic resin includes, for example, vinyl chloride resin, urethane resin, olefin resin, and the like. The materials may be used alone or in combination of two or more. The thickness of the adhesive layer is not particularly limited,
It can be appropriately selected according to the purpose.

The method for providing the adhesive layer is not particularly limited, and known methods can be adopted.
A method of providing the adhesive layer by winding the material in the form of a thin sheet having a thickness of about 0.3 to 0.5 mm and the like can be mentioned.

The obtained reinforcing layer is preferably subjected to high frequency irradiation for the purpose of surely vaporizing and removing the dew condensation or water adhering to the reinforcing fiber in a short time.

Next, an outer surface layer that covers the reinforcing layer is formed. In this case, the outer surface layer is formed of the styrene-based thermoplastic elastomer composition of the present invention.

The method for forming the outer surface layer is not particularly limited, and a known method can be adopted. For example, a known extruder can be used to coat the reinforcing layer. The thickness of the outer surface layer is not particularly limited and can be appropriately selected depending on the purpose.
It is 0.1 to 2.0 mm, preferably 0.3 to 1.5 mm.

The resulting hose of the present invention varies depending on the size and cannot be specified in a general manner, but R = 30
The bending force at that time is 6.8 N or less, particularly 5.0 to 6.5 N, and the quality is excellent in weather resistance.

The weather-resistant flexible hose of the present invention can be used in various fields, but in particular, a system kitchen exposed to sunlight, a vanity, a toilet, a toilet bowl, a water tank for heating, etc. Is preferably used as.

The present invention has been described in detail above.
The present invention is not limited to the above embodiments, and various modifications may be made without departing from the scope of the present invention.

[0032]

EXAMPLES The present invention will be described in more detail below by showing Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Examples 1 to 3, Comparative Examples 1 and 2] A rubber (or thermoplastic elastomer) inner tube (outer diameter =
The outer surface of the compounding composition shown in Table 1 was obtained by using an extrusion molding machine for a composite body in which reinforcing fibers (made of stainless steel wire, diameter = 0.3 mm) are braided on the outer peripheral surface of 13.0 mm, thickness = 1.4 mm). The layer composition was extruded to prepare a φ8 mm hose.

The flexibility of each obtained hose was evaluated by the following method. The results are shown in Table 1. <Evaluation of Flexibility> The bending force of each hose at R = 30 was measured for the reaction force when the hose was wound around the cylinder of R30. The smaller the bending force, the more flexible it is.

[0035]

[Table 1] * Water-added styrene butadiene rubber (Dynaron 232
4P) * Lightproofing agent (UVA (Tinuvin 326))

Examples 4 to 7 and Comparative Example 3 A rubber (or thermoplastic elastomer) inner tube (outer diameter = 1) was prepared by a conventional method.
The outer surface of the compounding composition shown in Table 2 was obtained by using an extrusion molding machine for a composite body in which reinforcing fibers (made of stainless steel wire, diameter = 0.3 mm) are braided on the outer peripheral surface of 3.0 mm, thickness = 1.4 mm). The layer composition was extruded to prepare a φ8 mm hose.

The weather resistance of each of the obtained hoses was evaluated by the following method. The results are shown in Table 2. <Evaluation of weather resistance> Using a sunshine weather meter for each hose, the ambient temperature was 63 ° C. for 180 hours, and the
The presence or absence of cracks was measured after standing for 300 hours.

[0038]

[Table 2] * Water-added styrene butadiene rubber (Dynaron 232
4P) * Lightproofing agent (UVA (Tinuvin 326))

From the results of Tables 1 and 2, the mixing ratio of the water-added styrene-butadiene rubber and the polypropylene in the styrene-based thermoplastic elastomer is water-added styrene-butadiene rubber: polypropylene = 60 to 80:
The hose of each of Examples 1 to 7 according to the present invention, which has a light resistance of 20 to 40 and a light resistance of 0.5 to 4.0% by mass with respect to the whole styrene-based thermoplastic elastomer composition, has flexibility and weather resistance. It is recognized that they have both.

[0040]

EFFECTS OF THE INVENTION According to the present invention, the above-mentioned problems in the prior art are solved, and flexibility and weather resistance are combined, especially in a system kitchen exposed to sunlight, a vanity, a toilet, a toilet bowl, and a water storage for heating. A styrene-based thermoplastic elastomer composition and a weather resistant flexible hose suitable for water supply and hot water supply piping such as a tank can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a hose of the present invention.

[Explanation of symbols]

1 hose 2 inner tube 3 Reinforcing layer 4 outer layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // (C08L 15/00 C08L 23:12 23:12) F term (reference) 3H111 AA02 BA15 BA25 BA29 BA31 BA34 CA53 CB04 CC01 CC18 CC19 DA12 DA26 DB03 DB05 EA04 4F100 AB04 AH03 AK73A AL01A AL05A AL09A AL09C AN00C AN02A BA03 BA06 BA10A BA10C CA07A DA11 DB13B DG12B DH00B EH17 EH51 JK17 JL09 AK08BP01 YY00A 4J002

Claims (5)

[Claims] 1. A styrene-based material containing a hydrogenated product of a vinyl-isoprene phase of a styrene-vinyl-isoprene-triblock copolymer (hereinafter abbreviated as water-added styrene-butadiene rubber) as a soft segment and polypropylene as a hard segment. A thermoplastic elastomer,
A styrene-based thermoplastic elastomer composition containing a light-resistant agent, wherein the mixing ratio of water-added styrene-butadiene rubber and polypropylene in the styrene-based thermoplastic elastomer is water-added styrene-butadiene rubber: polypropylene = 60 to 80: 20-40, The styrene type thermoplastic elastomer composition characterized by the above-mentioned. 2. The styrene according to claim 1, wherein the mixing ratio of the water-added styrene-butadiene rubber and the polypropylene in the styrene-based thermoplastic elastomer is water-added styrene-butadiene rubber: polypropylene = 65-75: 25-35. -Based thermoplastic elastomer composition. 3. The styrene-based thermoplastic elastomer composition according to claim 1, wherein the amount of the light-proofing agent is 0.5 to 4% by mass based on the whole styrene-based thermoplastic elastomer composition. 4. An inner pipe made of rubber or a thermoplastic elastomer, a reinforcing layer formed by braiding one or more layers of reinforcing fibers on the outer peripheral surface of the inner pipe, and an outer surface layer covering the reinforcing layer. A weather-resistant flexible hose having the outer surface layer formed of the styrene-based thermoplastic elastomer composition according to any one of claims 1 to 3. 5. The weather resistant flexible hose according to any one of claims 1 to 4, which is used as a pipe for hot and cold water supply such as a system kitchen, a vanity, a toilet, a cleansing toilet seat, and a water tank for heating.