JP2006207648A - Liquid hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid hose using an elastomer containing no halogen-containing compound, particularly free from odor transfer to water and colored water (black water) and superior in lighter weight, flexibility, heat resistance, durability and fitting assembling efficiency. <P>SOLUTION: The liquid hose comprises an inner layer 1 as an inside layer using an olefinic thermoplastic elastomer (TPO) consisting of polypropylene (PP) and an ethylene propylene diene rubber (EPDM), a reinforcing layer provided on the outer peripheral face of the inner layer 1 in a braided or wound manner, and an outer layer 3 as an outside layer using a dynamic cross-linked olefinic thermoplastic elastomer (TPV) that a completely or partially cross-linked ethylene propylene diene rubber (EPDM) of 5μm or shorter is dispersed into a polypropylene (PP) matrix (continuous layer). The inner layer and the outer layer are directly fused together via the reinforcing layer. The reinforcing layer preferably has a braiding or winding angle of 45-60°. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

TECHNICAL FIELD The present invention relates to a general housing hose and a liquid hose used as various industrial hoses, and more particularly to a liquid hose connecting between a hot water supply device and a bathtub or between various devices.

2. Description of the Related Art Conventionally, a hot water supply device and a bathtub are connected to a bathtub installed in a general house or the like by a hose in order to supply or recharge the bathtub. For such a hose, two hoses are used independently, or two hoses joined in parallel in advance are used as a twin pipe. These hoses are made of metal or cross-linked polyethylene.

  However, in the case of the metal hose or the cross-linked polyethylene hose, there is a problem that the flexibility is inferior, the workability is poor at the time of construction, and the assembly to the metal fitting is difficult. Accordingly, vinyl chloride hoses have been used, but vinyl chloride cannot pass hot water because of its poor heat resistance. For this reason, it has not been possible to efficiently supply hot water with hot water or catch up.

In order to solve these problems and allow hot water to pass through, an inner rubber layer made of water-resistant synthetic rubber, a reinforcing layer formed in a net shape by synthetic fibers, and an intermediate rubber layer made of oil-resistant synthetic rubber, A twin hose having a four-layer structure of outer surface layers made of a thermoplastic resin is disclosed.
JP 11-336955 A

  However, the hot water piping hose described in the above-mentioned JP-A-11-336955 is a twin pipe in which two hoses are arranged in parallel. (TPVC) is used. Vinyl chloride thermoplastic elastomer (TPVC) may affect the environment, for example, halogen may be liberated during disposal. Therefore, although the hot water piping hose described in the above publication can pass hot hot water, it cannot cope with environmental problems that have been increasing in recent years.

  In addition, since the hose for hot water piping has a vulcanized rubber layer on the inner surface, the smell of the hose itself is strong and the odor is likely to shift to hot water when it passes through hot water. There is a problem that colored water (black water) is likely to be generated by extraction.

  The present invention has been made in view of the present situation, does not include halogen-containing materials such as vinyl chloride resin, which cause environmental problems, and transfers odors to water and the like, and generation of colored water (black). In addition, an object of the present invention is to provide a liquid hose that is excellent in weight reduction, flexibility, heat resistance, durability, and metal fitting assembly.

In order to achieve the above object, the present invention is configured as follows. That is, the liquid hose according to the present invention uses an olefin-based thermoplastic elastomer (TPO) made of polypropylene (PP) and ethylene propylene diene rubber (EPDM) for the inner layer serving as the inner layer, and braided or formed on the outer peripheral surface of the inner layer. A reinforced layer by winding is provided, and an olefinic thermoplastic elastomer (TPO) is used for the outer layer serving as the outer layer, and the inner layer and the outer layer are directly fused via the reinforcing layer. The olefinic thermoplastic elastomer (TPO) of the inner layer is a dynamically cross-linked olefin in which ethylene propylene diene rubber (EPDM) of 5 μm or less is completely dispersed in a polypropylene (PP) matrix (continuous layer). A thermoplastic elastomer (TPV) is preferred.
The reinforcing layer preferably has an opening between the stitches so that the inner layer and the outer layer are directly fused. Therefore, the knitting angle or the winding angle is preferably 45 to 60 °.

  Although the hose can be used alone, it can be used as a plurality of tubes in which two or more are arranged in parallel and at least a part of the outer peripheral surface is joined. The hose can be used as a liquid hose for ordinary houses through which water, warm water, or antifreeze liquid passes.

  The above configuration does not affect the environment because it does not contain a halogen-containing resin such as vinyl chloride resin that causes environmental problems. In addition, since a thermoplastic elastomer that does not generate odor is used for the inner layer instead of vulcanized rubber, there is no odor transfer to the liquid, and there is no generation of colored water (black water) due to extraction of the mixture. Moreover, since the material of low specific gravity (0.96-1.00) was used for the inner layer and the outer layer, the liquid hose excellent in weight reduction, a softness | flexibility, heat resistance, durability, and metal fitting | attachment property can be obtained.

  Hereinafter, embodiments of the liquid hose according to the present invention will be described in detail. As shown in FIG. 1, the hose H is a multi-layered hose in which an inner layer 1 as an inner layer and an outer layer 3 are provided on the outer side through a reinforcing layer 2. The inner layer 1 is made of an olefinic thermoplastic elastomer (TPO) made of polypropylene (PP) and ethylene propylene diene rubber (EPDM), and a braided reinforcing layer 2 is provided on the outer peripheral surface of the inner layer 1, and an outer layer The outer layer 3 is formed of an olefin-based thermoplastic elastomer (TPO), and the inner layer and the outer layer are directly fused via the mesh of the reinforcing layer.

  The olefinic thermoplastic elastomer (TPO) used for the inner layer 1 is a dynamically crosslinked olefin in which ethylene propylene diene rubber (EPDM) of 5 μm or less is dispersed in a polypropylene (PP) matrix (continuous layer). A thermoplastic elastomer (TPV) is preferred. In this way, by making the olefinic thermoplastic elastomer (TPO) a polypropylene (PP) matrix (continuous layer) having 5 μm or less completely or partially crosslinked ethylene propylene diene rubber (EPDM) dispersed therein. , Extraction resistance can be improved.

  The reinforcing layer 2 can be formed into a hose by forming the inner layer 1 and then braiding it by an arbitrary method such as a blade or a spiral, preheating the tube and then extruding the outer layer. Moreover, you may shape | mold an inner layer, a reinforcement layer, and an outer layer in one metal mold | die. The stitches are preferably open so that the inner layer 1 and the outer layer 3 can be welded, and the knitting angle is 45 to 60 °. This is because when the knitting angle is 60 ° or more, the mesh becomes small and the resin of the inner layer 1 and the outer layer 3 cannot be directly welded, and the adhesive force is reduced. On the other hand, when the knitting angle is 45 ° or less, there is no problem at normal temperature, but there is a possibility that pressure resistance cannot be maintained in an atmosphere of 80 ° C., for example.

  In the hose having the above-described configuration, the inner layer 1 and the outer layer 3 are formed of an olefin-based thermoplastic elastomer. Therefore, the inner layer 1 and the outer layer 3 can be welded, and a vulcanization step is unnecessary. Moreover, since the stitches can be opened by setting the knitting angle to 45 to 60 °, the inner layer 1 and the outer layer 3 can be welded directly. Therefore, an adhesive layer and an intermediate layer are not necessary, and the process can be simplified and an inexpensive hose can be obtained.

Of course, the hose H can be used alone, but as shown in FIG. 2, two hoses having the same length are juxtaposed and a part of the outer layers 3 are joined together by welding. It may be used as a multiple tube. In order to obtain a plurality of tubes, hot air of 200 to 400 ° C. is applied to the joint portion of the outer layer, and two or three or more hoses are crimped and then cooled. Moreover, it can be set as a several pipe | tube by arbitrary methods, such as applying a hot plate directly to a junction part and welding. Although the liquid hose according to the present invention is not shown in the drawing, it is used with connecting fittings attached to both ends. Next, examples and comparative examples will be described.
(Examples 1-3)

  Next, various tests were performed on the olefinic thermoplastic elastomer used for the inner layer 1. Example 1 uses “Amzel 7KFR059-1” manufactured by Plus Tech as an olefinic thermoplastic elastomer (TPO) made of polypropylene (PP) and ethylene propylene diene rubber (EPDM), and is thick by injection molding. A test piece molded to 2 mm was used.

  Example 2 is an olefinic thermoplastic elastomer (TPO) made of polypropylene (PP) and ethylene propylene diene rubber (EPDM), and is completely or partially crosslinked to a polypropylene (PP) matrix (continuous layer) of 5 μm or less. A dynamically crosslinked olefin-based thermoplastic elastomer (TPV) in which ethylene propylene diene rubber (EPDM) was dispersed was used. As the TPV, a product name “Santoprene 101-73” manufactured by AES was used, and a test piece molded to a thickness of 2 mm by injection molding was used.

  In Example 3, a dynamically crosslinked olefin-based thermoplastic elastomer (TPV) in which ethylene propylene diene rubber (EPDM) was dispersed in the same polypropylene (PP) as in Example 2 was used. For the TPV, a test piece obtained by molding a product name “Sirlink 4175” manufactured by DSM to a thickness of 2 mm by injection molding was used.

  In Comparative Example 1 and Comparative Example 2, a material actually used as a hot water piping hose was used. In Comparative Example 1, a test piece obtained by vulcanizing ethylene propylene diene rubber (EPDM) as appropriate and molded to a thickness of 2 mm was used. In Comparative Example 2, a vinyl chloride thermoplastic elastomer (TPVC) was made to a thickness of 2 mm. A molded test piece was used.

About the said Examples 1-3 and Comparative Examples 1-2, the following various tests were done.
<Water resistance>
According to JISK6258 (a vulcanized rubber immersion test method), the test piece was immersed in purified water and subjected to accelerated aging at 70 ° C. for 300 h to 1000 h, and then the volume change rate was measured.
<Chlorine resistant water>
According to JISK6258 (Method of immersion test for vulcanized rubber), the test piece was immersed in 200 ppm of chlorine water (0.3% chlorine water diluted with water) and accelerated aging at 70 ° C. for 300 h to 1000 h, followed by volume change. The rate was measured.
<Antifreeze resistance>
According to JISK6258 (vulcanized rubber immersion test method), the test piece was immersed in an adjusted antifreeze KT brine P-34 (propylene glycol 29-33%) and accelerated aging at 100 ° C. for 300 h to 1000 h, and then volume. The rate of change was measured.
<Heat resistance>
According to JISK6257 (vulcanized rubber aging test method), the test piece was aged at 80 ° C. and 100 ° C. for 100 h to 1000 h, and then the change in hardness, change in tensile strength, and change in elongation were measured.
<Hot physical properties>
Hardness, tensile strength and elongation were measured according to JISK6251 and JISK6253 at an atmospheric temperature of 80 ° C and 100 ° C.
<Extraction resistance>
According to JISK6258 (Method of immersion test for vulcanized rubber), the test piece was purified water, chlorinated water (0.3% chlorinated water diluted with water) 200 ppm and adjusted antifreeze KT brine P-34 (propylene glycol 29-33) %), Purified water and chlorine water were subjected to accelerated aging at 80 ° C. and antifreeze solution at 100 ° C. for 300 to 1000 hours, and then the discoloration of the test solution was confirmed.
The measurement results are shown in Table 1.

The said test result has shown that Example 1, 2, 3 is suitable as a hose material for hot water piping.
Although Example 1 can be used as a hose material for hot water piping, the hot physical properties at 80 ° C. or higher are superior to those in Examples 2 and 3, and hot water supply or reheating is efficiently performed with hot water in recent years. The olefinic thermoplastic elastomer (TPO) composed of polypropylene (PP) and ethylene propylene diene rubber (EPDM) can be used as a hot water pipe hose, but a polypropylene (PP) matrix (continuous layer) It is more preferable to use a dynamically crosslinked olefin-based thermoplastic elastomer (TPV) in which a completely crosslinked or partially crosslinked ethylene propylene diene rubber (EPDM) is dispersed.

In addition, Examples 1, 2, and 3 are excellent in extraction resistance in water, chlorinated water, and antifreeze, and the inventors investigated polypropylene and polypropylene (PP) and ethylene propylene diene rubber ( It has been discovered that an olefinic thermoplastic elastomer (TPO) made of EPDM has excellent extraction resistance in water, chlorinated water and antifreeze. Moreover, it turns out that extraction resistance can be improved further by using the said dynamically crosslinked olefin type thermoplastic elastomer (TPV). Furthermore, considering the deterioration of the appearance and mechanical properties, the above dynamically crosslinked olefin thermoplastic elastomer (TPV) is an ethylene propylene diene rubber (TPM) that is 5 μm or less fully or partially crosslinked ethylene propylene diene rubber (TP). It is more preferable to use a dynamically crosslinked olefin-based thermoplastic elastomer (TPV) in which EPDM) is dispersed. Moreover, it is more preferable to use a dynamically crosslinked olefinic thermoplastic elastomer (TPV) that is completely crosslinked, because the extraction resistance is affected by the degree of crosslinking.
(Examples 4 to 8)

Next, a hose was actually made and various tests were performed. As in Examples 2 and 3, the hose is a dynamically crosslinked olefin-based thermoplastic in which a polypropylene (PP) matrix (continuous layer) is dispersed with 5 μm or less of completely or partially crosslinked ethylene propylene diene rubber (EPDM). The product name “Santoprene 101-73” manufactured by AES is used as an elastomer (TPV), polyester fiber 2200 dex is knitted at a knitting angle of 40 to 65 ° as a reinforcing layer, and a dynamically crosslinked olefin-based thermoplastic elastomer (TPV) is formed in an outer layer. ) As a product name “Santoprene 8221-70” manufactured by AES. The knitting angle and the braid center outer diameter were calculated by the following equations.
Knitting angle = tan ⁻¹ (braid center outer diameter × π (circumferential ratio) / braid pitch)
Braid center outer diameter = (braid outer diameter + tube outer diameter) / 2

  The knitting angles were 40 ° in Example 4, 45 ° in Example 5, 50 ° in Example 6, 60 ° in Example 7, and 65 ° in Example 8.

About the said Examples 4-8, the following various tests were done.
<Adhesion test>
The adhesive force between the inner layer and the outer layer was measured according to JIS K6330-6 (Part 6: Adhesion test).
<Pressure resistance>
According to JIS K6330-2 (Part 2: pressure resistance test) Section 7.1 (pressure resistance test), the test pressure was 0.3 MPa and the test time was 5 minutes. The test was conducted at RT (room temperature) and 80 ° C.
The measurement results are shown in Table 2.

From the above results, by forming the outer layer from an olefin-based thermoplastic elastomer, the vulcanization process is unnecessary, and the adhesive layer and the intermediate layer are unnecessary, thereby simplifying the process. Further, from the above results, the adhesive force between the inner layer and the outer layer is preferably 1.2 kN / m or more, and when the knitting angle is 60 ° or more, the mesh becomes smaller, and the welding area of the inner layer and the outer layer becomes smaller. Adhesive strength decreases. In addition, when used as a hot water piping hose, the pressure resistance is preferably 0.3 Mpa or more, and when the knitting angle is 45 ° or less, there is no problem at room temperature, but metal fittings occur in an 80 ° C atmosphere. When hot water at 80 ° C. is flowed, pressure resistance may not be maintained. Accordingly, the knitting angle is more preferably 45 ° to 60 °.
(Examples 9 and 10)

  Next, the hose was created similarly to Examples 4-8, and various tests were done. In the inner layer of Example 9, as in Examples 4 to 8, dynamic crosslinking in which ethylene propylene diene rubber (EPDM) of 5 μm or less was completely or partially crosslinked in a polypropylene (PP) matrix (continuous layer) was dispersed. The product name “Santoprene 101-73” manufactured by AES is used as the olefinic thermoplastic elastomer (TPV), polyester fiber 2200dex is knitted at a knitting angle of 53 ° as a reinforcing layer, and the dynamically crosslinked olefinic thermoplastic elastomer is formed in the outer layer. As (TPV), a hose was created using a trade name “Santoprene 8221-70” manufactured by AES.

  The inner layer of Example 10 is a dynamically crosslinked olefin-based thermoplastic elastomer (TPV) in which ethylene propylene diene rubber (EPDM) of 5 μm or less is dispersed in a polypropylene (PP) matrix (continuous layer). As a reinforcing layer, polyester fiber 2200 dex is knitted at a knitting angle of 53 °, and a dynamically crosslinked olefin-based thermoplastic elastomer (TPV) is used as an outer layer by DSM. A hose was created using the trade name “Cirlink 4165”. A hot water piping hose using ethylene propylene diene rubber (EPDM) for the inner layer of Comparative Example 3 and a vinyl chloride thermoplastic elastomer (TPVC) for the inner layer of Comparative Example 4 was prepared. Comparative Examples 3 and 4 are made of the same material as a commercially available hot water piping hose.

The following various tests were performed on Examples 9 and 10 and Comparative Examples 3 and 4.
<Odor>
Purified water is sealed in a 10m hose, left in an atmosphere at 80 ° C for 24 hours, and then the liquid is collected and compared in three points according to the Manual for Odor Measurement Method (Air Discharge Data) edited by the Air Quality Environment Office of the Environment Agency. The odor concentration was measured by the formula flask method.
<Contamination>
200 ppm of chlorinated water (0.3% chlorinated water diluted with water) was sealed in the hose, and after being left in an atmosphere at 80 ° C. for 200 hours, discoloration of the sealed solution was observed. Further, the hose was divided into two, and the inner surface of the hose was wiped off with a cotton swab to observe the color of the deposit.
<Minimum bending radius>
The bending radius at which the rate of change in outer diameter was 10% when the hose was bent was determined as the minimum bending radius. The outer diameter change rate (%) was obtained by the following formula.
Rate of change in outer diameter (%) = (initial hose outer diameter−hose outer diameter after bending) / initial hose outer diameter × 100
<Acceleration test>
The hose was assembled to the fitting and pressurized at 0.3 MPa with air in an atmosphere of 80 ° C. or 100 ° C., and the time for occurrence of abnormality such as leakage was determined.
<Twin adhesion>
Two hoses were arranged in parallel to form a twin pipe by welding, and a load (adhesive force) necessary to tear the two hoses was determined.
Table 3 shows the measurement results.

  Examples 9 and 10 are much more excellent in odor (odor concentration) than Comparative Examples 3 and 4. Therefore, the obtained hose has little transfer of odor to water or hot water, and when it is actually used as a hose for hot water piping, the odor hardly transfers to water or hot water. In addition, Examples 9 and 10 were superior in contamination compared to Comparative Examples 3 and 4, and when used for water containing chlorine such as tap water or warm water, water stayed in the hose and the chlorine concentration increased. There is no generation of colored water (black water) even when considering the case. Furthermore, Examples 9 and 10 showed good results in the minimum bending radius and acceleration test, and the material used for the inner layer and the outer layer had a low specific gravity (0.96 to 1.00). It is a hose excellent in flexibility, heat resistance, durability, and metal fitting assembly.

  In addition, from the above results, Examples 9 and 10 have sufficient twin adhesive strength to be used as a twin tube, and by using a dynamically crosslinked olefin-based thermoplastic elastomer (TPV) as an outer layer, It is possible to join two or more hoses by welding.

It is the perspective view which notched a part of hose for liquids concerning this invention. It is a perspective view of the twin pipe concerning this invention.

Explanation of symbols

1: Inner layer 2: Reinforcement yarn layer 3: Outer layer

Claims (5)

  An olefinic thermoplastic elastomer (TPO) made of polypropylene (PP) and ethylene propylene diene rubber (EPDM) is used for the inner layer, which is the inner layer, and a reinforcing layer by braiding or winding is provided on the outer peripheral surface of the inner layer to become the outer layer A liquid hose characterized in that an olefinic thermoplastic elastomer (TPO) is used for an outer layer, and the inner layer and the outer layer are directly fused via a reinforcing layer.   Dynamically cross-linked olefin-based thermoplastic in which olefin-based thermoplastic elastomer (TPO) in the inner layer is dispersed in polypropylene (PP) matrix (continuous layer) with 5 μm or less fully or partially cross-linked ethylene propylene diene rubber (EPDM) The liquid hose according to claim 1, wherein the liquid hose is an elastomer (TPV).   The liquid hose according to claim 1, wherein the reinforcing layer has a knitting angle or a winding angle of 45 to 60 °.   The liquid hose according to any one of claims 1 to 3, wherein two or more pipes are arranged in parallel and are a plurality of pipes formed by joining at least a part of the outer peripheral surface.   The liquid hose according to any one of claims 1 to 4, wherein the liquid hose is piped to a general house for water, hot water, or antifreeze.

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