JP3749527B2 - Toxic substance penetration prevention sleeve - Google Patents

Toxic substance penetration prevention sleeve Download PDF

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Publication number
JP3749527B2
JP3749527B2 JP2003111213A JP2003111213A JP3749527B2 JP 3749527 B2 JP3749527 B2 JP 3749527B2 JP 2003111213 A JP2003111213 A JP 2003111213A JP 2003111213 A JP2003111213 A JP 2003111213A JP 3749527 B2 JP3749527 B2 JP 3749527B2
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layer
polyethylene
penetration
sleeve
permeation
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Japanese (ja)
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JP2004316770A (en
Inventor
嘉宏 岡野
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Nippon Chutetsukan KK
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Nippon Chutetsukan KK
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Description

【0001】
【発明の属する技術分野】
この発明は、有害物質浸透防止スリーブ、特に、ポリエチレン製埋設水道管内に、地中の有機溶剤や油類等の有害物質が浸透することを確実に防止する有害物質浸透防止スリーブに関するものである。
【0002】
【従来の技術】
例えば、水道管が、有機溶剤や油類等の有害物質により汚染された地中に埋設されている場合、有害物質が水道管内に浸透して、飲料水を汚染する恐れがあった。このような有害物質の水道管内への浸透現象は、水道管がポリエチレン製の場合、特に、問題となっていた。しかしながら、ポリエチレン管は、鋳鉄ダクタイル管等に比べて、耐震性、柔軟性、耐食性等に富むといった特徴を有するので、水道管として広く使用されている。
【0003】
上述したポリエチレン管への有害物質の浸透を防止するために、特開2001−208286号公報(特許文献1)には、線状低密度ポリエチレン、ポリエチレン、ナイロン、ポリエチレン、線状低密度ポリエチレンの順に5層に積層された積層体からなるスリーブが開示されている。以下、この技術を従来技術という。
【0004】
上記従来技術によれば、5層に積層された積層体からなるスリーブによりポリエチレン管を覆うことによって、有機溶剤や油類等の有害物質が地中に埋設された水道管内に浸透することをある程度防止できる。
【0005】
【特許文献1】
特開2001−208286号公報
【0006】
【発明が解決しようとする課題】
しかしながら、埋設管へのさらなる有害物質の浸透防止効果の向上が望まれていた。
【0007】
従って、この発明の目的は、有機溶剤や油類等の有害物質の埋設管への浸透量を大幅に減少させることができる有害物質浸透防止スリーブを提供することにある。
【0008】
【課題を解決するための手段】
請求項1記載の発明は、有害物質の浸透防止のためのエチレン−ビニルアルコール共重合体樹脂もしくはエチレン−ビニルアルコール共重合体樹脂を主体とする樹脂からなる浸透防止層を含む、管の周囲を覆う有害物質浸透防止スリーブにおいて、前記管は、ポリエチレンからなり、前記浸透防止層の保護のために、前記浸透防止層の両側に浸透防止層以外の樹脂からなる保護層が積層され、前記浸透防止層と前記保護層との間には、前記浸透防止層と前記保護層とを融着するための融着層が形成され、前記保護層は、ポリエチレンからなり、前記融着層は、変性ポリエチレンからなることに特徴を有するものである。
【0013】
【発明の実施の形態】
次に、この発明の有害物質浸透防止スリーブの一実施態様を、図面を参照しながら説明する。
【0014】
図1は、この発明の有害物質浸透防止スリーブを示す部分断面図である。
【0015】
図1において、1は、エチレン−ビニルアルコール共重合体樹脂もしくはエチレン−ビニルアルコール共重合体樹脂を主体とする樹脂からなる浸透防止層、2は、浸透防止層1の両側に積層されたポリエチレンからなる保護層であり、埋設に生じる浸透防止層1の損傷を防止する。3は、浸透防止層1と保護層2とを融着させるための、マレイン酸変性ポリエチレンからなる融着層である。
【0016】
浸透防止層1を構成するエチレン−ビニルアルコール共重合体樹脂中のポリビニルアルコール成分は、有機溶剤や油類等の有害物質のポリエチレン管内への優れた浸透防止効果を有する。この理由は、ポリビニルアルコールのOH基が分子間水素結合を生成して、分子間隔が狭くなることにある。また、エチレン−ビニルアルコール共重合体樹脂中のポリエチレン成分は、優れた成形性を有する。従って、スリーブは、共押出しで筒状に容易に成形可能であり、このスリーブをポリエチレン製水道管に被せれば、有機溶剤や油類等の有害物質の水道管内への浸透を確実に防止することができる。
【0017】
次に、この発明のスリーブによる有害物質浸透防止効果を実証するために、以下の試験を実施した。
【0018】
図1に示すように、この発明のスリーブ(実施例)として、エチレン−ビニルアルコール共重合体樹脂からなる浸透防止層1の両側に、マレイン酸変性ポリエチレンからなる融着層3を介してポリエチレンからなる保護層2を積層した厚さ100μmのフィルムを用意し、比較例1として、浸透防止層1のみをナイロンとした厚さ100μmのフィルムを用意し、比較例2として、低密度ポリエチレン樹脂からなる厚さ100μmのフィルムを用意した。そして、各フィルムについて有機溶剤の浸透速度を調べた。その結果を、表1に示す。
【0019】
【表1】

Figure 0003749527
【0020】
表1から明らかなように、この発明のスリーブによれば、比較例1および2に比べて、有機溶剤の浸透が極めて小さいことが分かった。
【0021】
【発明の効果】
以上説明したように、この発明によれば、エチレン−ビニルアルコール共重合体樹脂もしくはエチレン−ビニルアルコール共重合体樹脂を主体とする樹脂からなる浸透防止層を有するスリーブによって、例えば、ポリエチレン製水道管を被覆することによって、有機溶剤や油類等の有害物質の水道管内への浸透量を著しく軽減することができるといった有用な効果がもたらされる。
【図面の簡単な説明】
【図1】この発明の有害物質浸透防止スリーブを示す部分断面図である。
【符号の説明】
1:浸透防止層
2:保護層
3:融着層[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a harmful substance permeation prevention sleeve, and more particularly to a harmful substance permeation prevention sleeve that reliably prevents penetration of harmful substances such as organic solvents and oils underground into a polyethylene buried water pipe.
[0002]
[Prior art]
For example, when a water pipe is buried in the ground contaminated with harmful substances such as organic solvents and oils, the harmful substances may permeate into the water pipe and contaminate drinking water. Such penetration of harmful substances into water pipes has been a problem especially when the water pipes are made of polyethylene. However, polyethylene pipes are widely used as water pipes because they have characteristics such as earthquake resistance, flexibility, corrosion resistance, and the like as compared with cast iron ductile pipes.
[0003]
In order to prevent the penetration of harmful substances into the polyethylene pipe described above, JP 2001-208286 A (Patent Document 1) describes linear low density polyethylene, polyethylene, nylon, polyethylene, linear low density polyethylene in this order. A sleeve made of a laminate of five layers is disclosed. Hereinafter, this technique is referred to as a conventional technique.
[0004]
According to the above prior art, by covering a polyethylene pipe with a sleeve made of a laminate of five layers, organic solvents, oils and other harmful substances can penetrate into the water pipe buried underground. Can be prevented.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-208286
[Problems to be solved by the invention]
However, further improvement in the effect of preventing the penetration of harmful substances into the buried pipe has been desired.
[0007]
Accordingly, an object of the present invention is to provide a harmful substance permeation prevention sleeve that can greatly reduce the amount of penetration of harmful substances such as organic solvents and oils into the buried pipe.
[0008]
[Means for Solving the Problems]
The invention of claim 1, wherein the ethylene for preventing penetration of toxic substances - vinyl alcohol copolymer resin or ethylene - containing permeation prevention layer composed of a resin mainly composed of vinyl alcohol copolymer resin, the periphery of the tube In the covering sleeve for preventing penetration of harmful substances, the tube is made of polyethylene, and a protective layer made of a resin other than the penetration preventing layer is laminated on both sides of the penetration preventing layer to protect the penetration preventing layer. A fusion layer for fusing the permeation prevention layer and the protection layer is formed between the layer and the protection layer, the protection layer is made of polyethylene, and the fusion layer is made of modified polyethylene. those having a particular characteristic consisting.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the harmful substance permeation prevention sleeve of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a partial cross-sectional view showing a harmful substance permeation prevention sleeve of the present invention.
[0015]
In FIG. 1, 1 is a penetration preventing layer made of ethylene-vinyl alcohol copolymer resin or a resin mainly composed of ethylene-vinyl alcohol copolymer resin, 2 is made of polyethylene laminated on both sides of the penetration preventing layer 1. It is a protective layer and prevents damage to the permeation preventive layer 1 that occurs during embedment. Reference numeral 3 denotes a fusion layer made of maleic acid-modified polyethylene for fusing the penetration preventing layer 1 and the protective layer 2 together.
[0016]
The polyvinyl alcohol component in the ethylene-vinyl alcohol copolymer resin constituting the permeation preventive layer 1 has an excellent permeation preventive effect for harmful substances such as organic solvents and oils into the polyethylene pipe. The reason for this is that the OH group of polyvinyl alcohol generates intermolecular hydrogen bonds, resulting in a narrow molecular spacing. Moreover, the polyethylene component in the ethylene-vinyl alcohol copolymer resin has excellent moldability. Therefore, the sleeve can be easily formed into a cylindrical shape by co-extrusion, and if this sleeve is put on a polyethylene water pipe, penetration of harmful substances such as organic solvents and oils into the water pipe is surely prevented. be able to.
[0017]
Next, in order to demonstrate the effect of preventing penetration of harmful substances by the sleeve of the present invention, the following test was conducted.
[0018]
As shown in FIG. 1, as a sleeve (Example) of the present invention, polyethylene is formed on both sides of a permeation preventive layer 1 made of ethylene-vinyl alcohol copolymer resin via a fusion layer 3 made of maleic acid-modified polyethylene. A film having a thickness of 100 μm obtained by laminating a protective layer 2 is prepared. As Comparative Example 1, a film having a thickness of 100 μm in which only the permeation preventing layer 1 is nylon is prepared, and as Comparative Example 2, a low-density polyethylene resin is used. A film having a thickness of 100 μm was prepared. And the penetration rate of the organic solvent was investigated about each film. The results are shown in Table 1.
[0019]
[Table 1]
Figure 0003749527
[0020]
As is apparent from Table 1, according to the sleeve of the present invention, it was found that the penetration of the organic solvent was extremely small as compared with Comparative Examples 1 and 2.
[0021]
【The invention's effect】
As described above, according to the present invention, for example, a polyethylene water pipe is formed by a sleeve having a penetration preventing layer made of an ethylene-vinyl alcohol copolymer resin or a resin mainly composed of an ethylene-vinyl alcohol copolymer resin. By coating the, a useful effect is achieved that the amount of penetration of harmful substances such as organic solvents and oils into the water pipe can be significantly reduced.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a hazardous substance permeation preventive sleeve according to the present invention.
[Explanation of symbols]
1: Penetration prevention layer 2: Protective layer 3: Fusion layer

Claims (1)

有害物質の浸透防止のためのエチレン−ビニルアルコール共重合体樹脂もしくはエチレン−ビニルアルコール共重合体樹脂を主体とする樹脂からなる浸透防止層を含む、管の周囲を覆う有害物質浸透防止スリーブにおいて、
前記管は、ポリエチレンからなり、前記浸透防止層の保護のために、前記浸透防止層の両側に浸透防止層以外の樹脂からなる保護層が積層され、前記浸透防止層と前記保護層との間には、前記浸透防止層と前記保護層とを融着するための融着層が形成され、前記保護層は、ポリエチレンからなり、前記融着層は、変性ポリエチレンからなることを特徴とする有害物質浸透防止スリーブ。
In a harmful substance permeation prevention sleeve covering the periphery of a pipe, including a permeation prevention layer made of ethylene-vinyl alcohol copolymer resin or a resin mainly composed of ethylene-vinyl alcohol copolymer resin for prevention of harmful substance penetration,
The tube is made of polyethylene, and a protective layer made of a resin other than the permeation preventive layer is laminated on both sides of the permeation preventive layer to protect the permeation preventive layer, and between the permeation preventive layer and the protective layer. Is formed with a fusion layer for fusing the penetration preventing layer and the protective layer, the protective layer is made of polyethylene, and the fusion layer is made of modified polyethylene. Substance penetration prevention sleeve.
JP2003111213A 2003-04-16 2003-04-16 Toxic substance penetration prevention sleeve Expired - Fee Related JP3749527B2 (en)

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JP4653589B2 (en) * 2005-08-16 2011-03-16 積水化学工業株式会社 Piping connection structure and piping connection method

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