JPH09108624A - Method for protecting metallic tube-connecting part from corrosion - Google Patents
Method for protecting metallic tube-connecting part from corrosionInfo
- Publication number
- JPH09108624A JPH09108624A JP27261895A JP27261895A JPH09108624A JP H09108624 A JPH09108624 A JP H09108624A JP 27261895 A JP27261895 A JP 27261895A JP 27261895 A JP27261895 A JP 27261895A JP H09108624 A JPH09108624 A JP H09108624A
- Authority
- JP
- Japan
- Prior art keywords
- connecting portion
- tubular body
- metal pipe
- heat
- anticorrosion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は金属管接続部の防食
保護方法に関し、更に詳しくは、施工現場において、金
属管を互いに溶接して形成した接続部を、防食性能が優
れ、しかも高硬度の防食保護層で短時間のうちに被覆す
ることができる金属管接続部の防食保護方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion protection method for a metal pipe connecting portion, and more specifically, a connection portion formed by welding metal pipes to each other at a construction site has excellent anticorrosion performance and high hardness. The present invention relates to an anticorrosion protection method for a metal pipe connecting portion, which can be covered with an anticorrosion protection layer in a short time.
【0002】[0002]
【従来の技術】鋼管やステンレス管などの金属管の外周
面がポリエチレンやポリウレタンなどで被覆されている
被覆金属管を施工現場で互いに接続する場合には、被覆
が管端から所望の長さだけ剥離除去された各金属管の管
端を突き合わせ、その突き合わせ個所を溶接する。2. Description of the Related Art When metal pipes such as steel pipes and stainless steel pipes are coated with polyethylene or polyurethane on the outer peripheral surface, when connecting metal pipes to each other at the construction site, the coating is the desired length from the pipe end. The pipe ends of the peeled and removed metal pipes are butted, and the butted parts are welded.
【0003】したがって、溶接後にあっては、その接続
部には、溶接部とその溶接部の両脇に所望の長さで裸出
する金属管の表面部とが存在することになるので、この
接続部に対して防食処理を施すことが必要になる。従来
上記防食処理としては、金属管相互の溶接に先立ち、い
ずれか一方の金属管に熱収縮チューブを配置しておき、
溶接後は前記熱収縮チューブをその溶接部にまで移動し
て当該溶接部とその両脇の金属管の裸出表面部とを被包
し、ついで、例えばプロパンガスバーナなどを用いて熱
収縮チューブを加熱・収縮させることにより接続部の外
周に熱収縮チューブを密着させ、接続部を被覆するとい
う方法が広く採用されている。Therefore, after welding, at the connecting portion, there is a welded portion and the surface portion of the metal pipe which is bare at a desired length on both sides of the welded portion. It is necessary to apply anticorrosion treatment to the connection part. Conventionally, as the above-mentioned anticorrosion treatment, prior to the welding of the metal tubes to each other, a heat shrinkable tube is placed on one of the metal tubes,
After welding, the heat-shrinkable tube is moved to the welded part to cover the welded part and the bare exposed surface parts of the metal pipes on both sides of the welded part, and then the heat-shrinkable tube is sealed using, for example, a propane gas burner. A method in which a heat-shrinkable tube is brought into close contact with the outer periphery of the connection portion by heating and shrinking to cover the connection portion is widely adopted.
【0004】しかしながら、一般に使用されている熱収
縮チューブは、その基材が架橋された中密度ポリエチレ
ンで構成されているので、比較的軟質であり、その強度
特性が優れているものとはいいがたく、そのため、金属
管が地中に埋設される管である場合、埋設時に加わる土
砂の衝撃などによって、防食施工後の熱収縮チューブが
損傷することがあり、極端な場合には、当該熱収縮チュ
ーブが裂けてしまい、接続部に対する防食能を喪失する
ことがある。However, the commonly used heat-shrinkable tube is relatively soft and has excellent strength characteristics because its base material is composed of cross-linked medium density polyethylene. Therefore, if the metal pipe is buried in the ground, the heat-shrinkable tube after anticorrosion work may be damaged by the impact of the earth and sand applied during burial. The tubing may tear and lose its ability to protect the connection from corrosion.
【0005】また、金属管の接続部の外側を例えば2つ
割り構造の金型で被包し、この金型と前記接続部との間
に形成されている空隙部に液状の反応性樹脂を注入し、
その反応性樹脂を熱硬化したのち金型を取り外して接続
部を被覆する所望厚みの防食保護層を形成するという工
法も採用されている。例えば、0.5〜1時間程度の時間
で硬化反応が終了する2液混合型のウレタン系樹脂を前
記した金型の空隙部に圧入して硬化するという工法が知
られている。Further, the outside of the connecting portion of the metal tube is covered with, for example, a metal mold having a split structure, and a liquid reactive resin is filled in a void portion formed between the metal mold and the connecting portion. Inject and
A method is also employed in which the reactive resin is thermoset and then the mold is removed to form an anticorrosion protective layer with a desired thickness that covers the connection portion. For example, a method is known in which a two-liquid mixed type urethane resin whose curing reaction is completed in about 0.5 to 1 hour is pressed into the cavity of the above-mentioned mold to cure.
【0006】[0006]
【発明が解決しようとする課題】後者の金型を用いる工
法では、反応性樹脂として、その硬化物が高硬度になる
ものを使用すれば、熱収縮チューブを用いた場合よりも
防食保護層の強度を高め、しかも防食能を高めることが
できる。しかしながら、この工法の場合、防食処理を施
すべき接続部の外径に合わせて、口径が異なる多種類の
金型を用意しておくことが必要になる。しかし、金型は
高価なものであるため、それを用いた施工時のコスト上
昇が引き起こされる。In the latter method using a mold, when a reactive resin whose hardened product has a high hardness is used, the anticorrosion protective layer of the anticorrosion protective layer is more than that when a heat shrinkable tube is used. The strength can be increased and the anticorrosion ability can be increased. However, in the case of this construction method, it is necessary to prepare various types of dies having different diameters according to the outer diameter of the connection portion to be subjected to anticorrosion treatment. However, since the mold is expensive, the cost at the time of construction using the mold is increased.
【0007】また、接続部の外径が大径化すると、それ
に応じて用いる金型の口径も大きくなるが、そのような
大口径の金型はかなりの重量になるため、それを金属管
の接続部に配置するための作業も例えばクレーンを使用
するなどして大規模化し、実際の施工はかなり困難とな
る。更に、注入する反応性樹脂の種類によっては、注入
時の圧力が高くなる場合がある。そのため、金型を金属
管の接続部に配置したときに、液漏れが起こらないよう
に配置しなければならず、その作業はかなり煩雑とな
る。Further, when the outer diameter of the connecting portion is increased, the diameter of the die used is correspondingly increased. However, since such a die having a large diameter becomes a considerable weight, it can be used as a metal pipe. The work for arranging at the connection part also becomes large in scale, for example, by using a crane, and actual construction becomes considerably difficult. Further, depending on the type of reactive resin to be injected, the pressure during injection may be high. Therefore, when the mold is arranged at the connecting portion of the metal pipe, it must be arranged so that liquid leakage does not occur, and the work is considerably complicated.
【0008】本発明は、金型を用いて防食保護層を形成
する工法における上記した問題を解決し、しかも後述す
る反応液を用いることにより、金属管の接続部に、高硬
度で防食能が優れている防食保護層を短時間、低コスト
で形成することができる金属管の接続部の防食保護方法
の提供を目的とする。The present invention solves the above-mentioned problems in the method of forming an anticorrosion protective layer by using a mold, and moreover, by using the reaction solution described later, the connection portion of the metal tube has high hardness and anticorrosion ability. It is an object of the present invention to provide an anticorrosion protection method for a connecting portion of a metal pipe, which is capable of forming an excellent anticorrosion protection layer in a short time and at low cost.
【0009】[0009]
【課題を解決するための手段】上記した目的を達成する
ために、本発明においては、金属管の溶接部および前記
溶接部の両脇に位置する金属管の裸出表面部を含む金属
管の接続部を被包して熱可塑性樹脂から成る筒状体を配
置し、前記接続部と前記筒状体が形成する空隙部に、ノ
ルボルネン系単量体、メタセシス触媒、および活性剤を
含む反応液を注入したのち前記反応液を硬化して前記接
続部を被覆する防食保護層を形成することを特徴とする
金属管接続部の防食保護方法が提供される。In order to achieve the above object, in the present invention, there is provided a metal pipe including a welded portion of the metal pipe and a bare exposed surface portion of the metal pipe located on both sides of the welded portion. A tubular body made of a thermoplastic resin is disposed so as to cover the connecting portion, and a reaction liquid containing a norbornene-based monomer, a metathesis catalyst, and an activator in the void formed by the connecting portion and the tubular body. Is provided, and then the reaction solution is cured to form an anticorrosion protective layer that covers the connection portion.
【0010】[0010]
【発明の実施の形態】本発明においては、図1の部分断
面図で示したように、金属管1の管端部の防食塗装(図
示しない)を除去して金属管1の表面部1aを裸出し、
また、溶接すべき金属管2の管端部の防食塗装(同じく
図示しない)を除去して金属管の表面部2aを裸出し、
各金属管の管端を互いに突き合わせてそこを溶接する。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as shown in the partial cross-sectional view of FIG. 1, the anticorrosion coating (not shown) on the pipe end of the metal pipe 1 is removed to remove the surface portion 1a of the metal pipe 1. Naked
Further, the anticorrosion coating (also not shown) on the end of the metal pipe 2 to be welded is removed to expose the surface 2a of the metal pipe.
The ends of each metal pipe are butted against each other and welded together.
【0011】したがって、溶接終了後の金属管1,2の
接続部Aには、溶接部3とその両脇に位置する裸出表面
部1a,2aとが形成されている。ついで、図2で示し
たように、この接続部Aの外側周面を被包して熱可塑性
樹脂から成る筒状体4が配置される。この筒状体4を構
成する熱可塑性樹脂としては、例えば、ポリエチレン、
エチレン・酢酸ビニル共重合樹脂、ポリプロピレン、ポ
リスチレン、アクリロニトリル・スチレン樹脂、アクリ
ロニトリル・ブタジエン・スチレン樹脂、メタクリル樹
脂、ポリ塩化ビニル、ポリアミン、ポリカーボネート、
ポリエチレンテレフタレート、ポリブチレンテレフタレ
ート、セルロース・アセテート、ジアリルフタレート、
ポリブタジエン、塩素化ポリオレフィン、塩化ポリビニ
リデン、ポリアセタール、ポリメチルペンテン、ブタジ
エン・スチレン樹脂、熱可塑ポリウレタン、ポリ四フッ
化エチレンなどをあげることができる。Therefore, the welded portion 3 and the bare exposed surface portions 1a and 2a located on both sides of the welded portion 3 are formed at the connecting portion A of the metal pipes 1 and 2 after the welding is completed. Then, as shown in FIG. 2, the tubular body 4 made of a thermoplastic resin is arranged so as to cover the outer peripheral surface of the connection portion A. Examples of the thermoplastic resin forming the tubular body 4 include polyethylene,
Ethylene / vinyl acetate copolymer resin, polypropylene, polystyrene, acrylonitrile / styrene resin, acrylonitrile / butadiene / styrene resin, methacrylic resin, polyvinyl chloride, polyamine, polycarbonate,
Polyethylene terephthalate, polybutylene terephthalate, cellulose acetate, diallyl phthalate,
Examples thereof include polybutadiene, chlorinated polyolefin, polyvinylidene chloride, polyacetal, polymethylpentene, butadiene / styrene resin, thermoplastic polyurethane, and polytetrafluoroethylene.
【0012】筒状体4は、上記熱可塑性樹脂のいずれか
を用いて成形されるパイプやチューブなどであればどち
らも使用することができるが、それらのうち、可撓性に
富むチューブであることが好ましい。樹脂の種類によっ
ては、延伸成形して熱収縮性を付与したチューブである
ことが更に好ましい。この筒状体4には、後述する反応
液を注入するための注入口4a、空気抜きのための空気
孔4dが取りつけられている。そして、筒状体4の内径
は接続部Aの外径よりも大径であり、また筒状体4の全
長は、接続部Aよりも長く、その両端部4b,4cは、
それぞれ、金属管1の被覆層1b、金属管2の被覆層2
bの一部と確実に重なり合うような長さになっている。
なお、空気孔4dは、反応液を注入する際に空隙内の気
体が抜けやすく、反応液が洩れにくくなるように、通
常、上方に取付けられる。それに対し、注入口4aは、
空隙内に気体が残存しにくくなるためには、下方に取付
けることが好ましく、他方、現場での作業性の点では上
方に取付けられることが好ましいので、実施の状況に合
わせて注入口の取付け位置を決めればよい。The tubular body 4 may be either a pipe or a tube formed by using any of the above-mentioned thermoplastic resins, and either of them can be used. Among them, the tube is highly flexible. It is preferable. Depending on the type of resin, a tube that is stretch-molded to have heat-shrinkability is more preferable. An inlet 4a for injecting a reaction solution described later and an air hole 4d for venting air are attached to the cylindrical body 4. The inner diameter of the tubular body 4 is larger than the outer diameter of the connecting portion A, the total length of the tubular body 4 is longer than that of the connecting portion A, and both end portions 4b and 4c thereof are
Coating layer 1b of metal tube 1 and coating layer 2 of metal tube 2, respectively
It has such a length that it surely overlaps a part of b.
The air holes 4d are usually mounted above so that the gas in the voids easily escapes when the reaction solution is injected and the reaction solution does not easily leak. On the other hand, the inlet 4a is
In order to prevent gas from remaining in the void, it is preferable to install it downward, while it is preferable to install it upward in terms of workability at the site. Just decide.
【0013】そして、配置された筒状体4の両端部4
b,4cは金属管1,2のそれぞれの被覆層1b,2b
と密着している。なお、この筒状体4は、前記した接続
部Aの形成に先立って一方の金属管の方に当該筒状体4
を寄せておき、接続部Aの形成後に接続部Aを被包する
ように移動して配置すればよい。Both ends 4 of the cylindrical body 4 arranged
b and 4c are coating layers 1b and 2b of the metal tubes 1 and 2, respectively.
It is in close contact with. It should be noted that, prior to the formation of the above-mentioned connecting portion A, the tubular body 4 is attached to one of the metal pipes.
After the connection portion A is formed, the connection portion A may be moved and arranged so as to cover the connection portion A.
【0014】かくして、筒状体4の長手方向には、その
両端部4b,4cの間に、被覆層1b,2bと接続部A
を取り囲むようにして空隙部Bが形成される。筒状体4
の両端部4b,4cと被覆層1b,2bを密着して気体
および液体が洩れない構造にするためには、被覆層1
b,2bの表面の所望個所に、例えばブチルゴム系のマ
スチックを巻回して粘着剤層5a,5bを形成し、この
粘着剤層5a,5bと筒状体4の両端部4b,4cを接
着すればよい。Thus, in the longitudinal direction of the tubular body 4, the coating layers 1b and 2b and the connecting portion A are provided between both ends 4b and 4c thereof.
A void portion B is formed so as to surround the. Tubular body 4
In order to make the structure in which gas and liquid do not leak by closely adhering both end portions 4b, 4c of the coating layer to the coating layers 1b, 2b, the coating layer 1
At a desired position on the surface of b, 2b, for example, a butyl rubber mastic is wound to form pressure-sensitive adhesive layers 5a, 5b, and the pressure-sensitive adhesive layers 5a, 5b and both ends 4b, 4c of the tubular body 4 are bonded together. Good.
【0015】その場合、筒状体4として熱収縮チューブ
を用い、その熱収縮チューブの両端部を粘着剤層に接触
させ、その接触個所を選択的に加熱すると、その加熱個
所のみが熱収縮して粘着剤層と接着するのでより確実な
液密構造を形成することができて好適である。この状態
で、筒状体4の注入口4aから反応液を空隙部Bに注入
する。In this case, a heat-shrinkable tube is used as the tubular body 4, both ends of the heat-shrinkable tube are brought into contact with the adhesive layer, and the contact point is selectively heated, so that only the heated point shrinks. Since it adheres to the pressure-sensitive adhesive layer, a more reliable liquid-tight structure can be formed, which is preferable. In this state, the reaction liquid is injected into the void B from the injection port 4a of the tubular body 4.
【0016】本発明方法で用いる反応液とは、ノルボル
ネン系単量体とメタセシス触媒と活性剤と、更に必要に
応じては後述する任意成分とを含むものであって、ノル
ボルネン系単量体が開環して塊状重合を起こすものであ
る。すなわち、1液のみではノルボルネン系単量体の塊
状重合が起こらないように、上記した各成分を2液以上
に分割して反応原液を用意しておき、金型への注入作業
の直前でこれら各反応原液が混合されたものである。The reaction liquid used in the method of the present invention contains a norbornene-based monomer, a metathesis catalyst, an activator, and, if necessary, an optional component described later, and the norbornene-based monomer is It opens the ring to cause bulk polymerization. That is, in order to prevent bulk polymerization of the norbornene-based monomer with only one liquid, the above-mentioned components are divided into two or more liquids to prepare a reaction stock solution, and these are prepared immediately before injection into the mold. Each reaction stock solution is mixed.
【0017】この反応液は、反応原液を混合した直後の
粘度が約300cpsと低く非常に流動性に富んでい
る。したがって、反応液を筒状体4の空隙部Bに注入す
るときには、反応液に大きな圧力を加えて注入すること
は不要であり、注入作業の開始とともに、反応液は迅速
に空隙部Bの隅々にまで流れ込んでいき、しかも空気を
巻き込むことなく均質な状態で注入される。The reaction solution has a low viscosity of about 300 cps immediately after mixing the reaction stock solution and has a very high fluidity. Therefore, when injecting the reaction liquid into the void B of the tubular body 4, it is not necessary to apply a large pressure to the reaction liquid, and the reaction liquid is promptly injected into the corner of the void B as the injection work is started. It flows into various parts and is injected in a homogeneous state without involving air.
【0018】そして、約60℃程度の温度に加熱される
と、急速に、発熱硬化して5分以内の時間で固化する。
この硬化反応の過程は開環重合であるため、分解ガスな
どは発生せず、しかも、圧縮硬度、伸び、曲げ弾性率な
どの機械的な強度特性は硬化反応の初期段階から確実に
発現しはじめ、硬化反応開始後、約10分以内で最終特
性値の50%以上の値にまで到達する。When it is heated to a temperature of about 60 ° C., it is rapidly exothermicly cured and solidified within 5 minutes.
Since the process of this curing reaction is ring-opening polymerization, no decomposition gas is generated, and the mechanical strength characteristics such as compression hardness, elongation, flexural modulus, etc. begin to develop reliably from the initial stage of the curing reaction. The value of 50% or more of the final characteristic value is reached within about 10 minutes after the initiation of the curing reaction.
【0019】ここで、ノルボルネン系単量体としては、
ノルボルネン環を有すものであれば何であってもよい
が、例えば、ノルボルネン、ノルボルナジエンのような
二環体;ジシクロペンタジエン、ジヒドロジシクロペン
タジエンのような三環体;テトラシクロドデセンのよう
な四環体;トリシクロペンタジエンのような五環体;テ
トラシクロペンタジエンのような七環体;これらに対
し、メチル、エチル、プロピル、ブチルなどのアルキ
ル、ビニルなどのアルケニル、エチリデンなどのアルキ
リデン、フェニル、トリル、ナフチルなどのアリールで
置換して成る置換体;更には、エステル基、エーテル
基、シアノ基、ハロゲン原子などの極性基を有する置換
体;をあげることができる。Here, as the norbornene-based monomer,
It may be anything as long as it has a norbornene ring, for example, a bicyclic compound such as norbornene or norbornadiene; a tricyclic compound such as dicyclopentadiene or dihydrodicyclopentadiene; a tetracyclododecene such as tetracyclododecene. Tetracycles; pentacycles such as tricyclopentadiene; heptcycles such as tetracyclopentadiene; alkyls such as methyl, ethyl, propyl, butyl, alkenyls such as vinyl, alkylidene such as ethylidene, phenyl. , Tolyl, naphthyl and the like substituted with an aryl; further, a substituent having a polar group such as an ester group, an ether group, a cyano group and a halogen atom.
【0020】これらの単量体は、それぞれ単独で用いて
もよく、また2種以上を適宜に混合して用いてもよい。
これらのうち、入手が容易であり、反応性が優れ、反応
終了後の硬化物の耐熱性が優れているという点で、三環
体、四環体または五環体を好適なものとしてあげること
ができる。このノルボルネン系単量体は開環重合して樹
脂化し、固化していくが、そのときに、生成させる開環
重合体を熱硬化型にすることが好ましい。そのために
は、用いるノルボルネン系単量体のうち、10重量%以
上、好ましくは30重量%以上が架橋可能である単量体
を使用すればよい。この架橋可能な単量体は、反応性2
重結合を1分子内に2個以上有する多環ノルボルネン系
単量体であって、具体的には、ジシクロペンタジエン、
トリシクロペンタジエン、テトラシクロペンタジエンな
どをあげることができる。These monomers may be used alone or in a suitable mixture of two or more kinds.
Among these, tricyclic, tetracyclic or pentacyclic are preferred because they are easily available, have excellent reactivity, and have excellent heat resistance of the cured product after the reaction. You can The norbornene-based monomer is ring-opening polymerized to be resinified and solidified. At this time, the ring-opening polymer to be formed is preferably thermosetting. For that purpose, 10% by weight or more, preferably 30% by weight or more, of the norbornene-based monomer to be used may be a crosslinkable monomer. This crosslinkable monomer has a reactivity of 2
A polycyclic norbornene-based monomer having two or more heavy bonds in one molecule, specifically, dicyclopentadiene,
Examples thereof include tricyclopentadiene and tetracyclopentadiene.
【0021】メタセシス触媒は、上記したノルボルネン
系単量体の開環重合を進めるための触媒であって、その
種類は格別限定されるものではなく複分解してノルボル
ネン系単量体を開環重合させるものであれば何であって
もよく、例えば、タングステン、モリブデン、タンタル
などのハロゲン化物、オキシハロゲン化物、酸化物また
はアンモニウム塩などをあげることができる。The metathesis catalyst is a catalyst for promoting the ring-opening polymerization of the norbornene-based monomer, and the kind thereof is not particularly limited, and metathesis is carried out to cause the ring-opening polymerization of the norbornene-based monomer. Any material may be used, and examples thereof include halides such as tungsten, molybdenum and tantalum, oxyhalides, oxides and ammonium salts.
【0022】このメタセシス触媒の使用量は、用いる反
応液におけるノルボルネン系単量体1モルに対し、通
常、0.01〜50ミリモル、好ましくは、0.1〜20ミ
リモルに設定される。この使用量が少なすぎると、ノル
ボルネン系単量体を開環重合させるための活性が低すぎ
て開環重合に多大な時間がかかるため、筒状体内での硬
化が迅速に進行しなくなり、また、使用量が多すぎると
開環重合が激しく進んでしまい、反応液が筒状体の空隙
部に注入されている過程で硬化してしまったり、またメ
タセシス触媒が析出して反応液を均質な状態で保存する
ことが困難になる。The amount of the metathesis catalyst used is usually set to 0.01 to 50 mmol, preferably 0.1 to 20 mmol, per 1 mol of the norbornene-based monomer in the reaction solution used. If the amount used is too small, the activity for ring-opening polymerization of the norbornene-based monomer is too low and the ring-opening polymerization takes a lot of time, so that curing in the tubular body does not proceed rapidly, and However, if the amount used is too large, the ring-opening polymerization will proceed rapidly, and the reaction solution will cure in the process of being injected into the voids of the tubular body, or the metathesis catalyst will precipitate and the reaction solution will be homogeneous. It becomes difficult to save in the state.
【0023】このような反応液には、更に、メタセシス
触媒の触媒活性を高めることができる活性剤が配合され
ている。活性剤としては、メタセシス触媒を活性化でき
るものであれば何であってもよく、例えば、アルキルア
ルミニウム、アルキルアルミニウムハライド、アルコキ
シアルキルアルミニウムハライド、アリールオキシアル
キルアルミニウムハライド、有機すず化合物などをあげ
ることができる。An activator capable of enhancing the catalytic activity of the metathesis catalyst is further added to such a reaction solution. Any activator may be used as long as it can activate the metathesis catalyst, and examples thereof include alkylaluminum, alkylaluminum halides, alkoxyalkylaluminum halides, aryloxyalkylaluminum halides and organic tin compounds. .
【0024】この活性剤の使用量は、格別限定されるも
のではないが、通常、反応液におけるメタセシス触媒1
モルに対し、1〜10モルに設定される。この使用量が
少なすぎたり、また多すぎたりすると、メタセシス触媒
の場合と同じような不都合を生ずるからである。更に、
反応液には、公知の酸化防止剤、充填剤、顔料、着色
剤、発泡剤、難燃化剤、黒鉛のような固体潤滑剤など他
の任意成分が配合されていてもよい。The amount of the activator used is not particularly limited, but it is usually the metathesis catalyst 1 in the reaction solution.
It is set to 1 to 10 moles per mole. This is because if the amount used is too small or too large, the same disadvantages as in the case of the metathesis catalyst occur. Furthermore,
Other optional components such as known antioxidants, fillers, pigments, colorants, foaming agents, flame retardants, and solid lubricants such as graphite may be added to the reaction liquid.
【0025】また、この反応液に、ポリブタジエン、ス
チレン−ブタジエン共重合体、スチレン−ブタジエン−
スチレン共重合体、スチレン−イソプレン−スチレン共
重合体のようなジエン系エラストマーや、天然ゴム、ポ
リイソプレン、エチレン−プロピレン−ジエンターポリ
マーなどを配合すると、得られた硬化物の耐衝撃性が向
上するので好適である。上記ジエン系エラストマーを配
合する場合、その配合量は、反応液におけるノルボルネ
ン系単量体の重量に対し、15重量%以下、好ましくは
10重量%以下に設定される。配合量が多くなりすぎる
と、反応液は高粘性になって筒状体内への注入が困難に
なるとともに、硬化物の耐熱性や剛性の低下が起こりは
じめるからである。In addition, polybutadiene, styrene-butadiene copolymer, styrene-butadiene-
When a diene elastomer such as a styrene copolymer or a styrene-isoprene-styrene copolymer, natural rubber, polyisoprene, or ethylene-propylene-diene terpolymer is blended, the impact resistance of the obtained cured product is improved. Therefore, it is preferable. When the diene-based elastomer is blended, the blending amount is set to 15% by weight or less, preferably 10% by weight or less, based on the weight of the norbornene-based monomer in the reaction solution. This is because if the blending amount becomes too large, the reaction liquid becomes highly viscous, and it becomes difficult to inject it into the tubular body, and at the same time, the heat resistance and rigidity of the cured product begin to decrease.
【0026】上記したような成分から成る反応液は、前
記したように、1液のみではノルボルネン系単量体の開
環重合反応が起こらないように、2液以上に分割した状
態で反応原液を調製しておき、筒状体への注入作業の直
前で混合されるものであって、そのときはじめてノルボ
ルネン系単量体の開環重合反応が起こって硬化反応が進
行する。As described above, the reaction solution comprising the above components is prepared by dividing the reaction solution into two or more solutions so that the ring-opening polymerization reaction of the norbornene-based monomer does not occur with only one solution. It is prepared and mixed immediately before the injection work into the tubular body, at which time the ring-opening polymerization reaction of the norbornene-based monomer occurs and the curing reaction proceeds.
【0027】例えば、ノルボルネン系単量体とメタセシ
ス触媒と他の任意成分とから成る反応原液A、またノル
ボルネン系単量体と活性剤と他の任意成分とから成る反
応原液Bは、それぞれは単独で硬化反応を起こすことは
ない。しかし、反応原液Aと反応原液Bを混合すると、
そのときには、開環重合反応に必要な成分、すなわち、
ノルボルネン系単量体、メタセシス触媒および活性剤の
全てがそろっている反応液になり、ノルボルネン系単量
体の開環重合反応が開始する。本発明においては、反応
原液を混合して反応液とし、これを直ちに筒状体の空隙
部に注入して硬化させる。For example, a reaction stock solution A containing a norbornene-based monomer, a metathesis catalyst, and other optional components, and a reaction stock solution B containing a norbornene-based monomer, an activator, and other optional components are each used alone. Does not cause a curing reaction. However, when the reaction stock solution A and the reaction stock solution B are mixed,
At that time, a component necessary for the ring-opening polymerization reaction, that is,
A reaction solution in which all of the norbornene-based monomer, the metathesis catalyst, and the activator are prepared, and the ring-opening polymerization reaction of the norbornene-based monomer starts. In the present invention, the reaction stock solution is mixed to form a reaction solution, which is immediately poured into the void portion of the cylindrical body to be cured.
【0028】通常、筒状体の注入口に反応射出成形機の
ミキシング・ヘッドを装着し、このミキシング・ヘッド
内に前記した2種以上の反応原液を同時に射出すること
により衝突混合させて反応液を調製し、そのまま筒状体
の空隙部へと注入する。本発明方法は、施工現場で適用
されるので、その作業性のことを考えると、2種類の反
応原液を用いて反応液を調製することが好ましいが、3
種類以上の反応原液を用いて反応液を調製してもよい。Usually, a mixing head of a reaction injection molding machine is attached to the injection port of a tubular body, and two or more kinds of the above-mentioned reaction stock solutions are simultaneously injected into the mixing head to cause collision and mixing, thereby producing a reaction solution. Is prepared and poured into the void portion of the tubular body as it is. Since the method of the present invention is applied at a construction site, considering the workability thereof, it is preferable to prepare a reaction solution using two types of reaction stock solutions.
The reaction solution may be prepared using more than one kind of reaction stock solution.
【0029】なお、この場合、反応原液を混合したのち
にノルボルネン系単量体と各成分が互いに充分混合して
開環重合が進行するために、混合前の各反応原液には、
いずれも、ノルボルネン系単量体を含有させておくこと
が好ましい。しかし、混合前の反応原液に、ノルボルネ
ン系単量体、メタセシス触媒および活性剤の3者を含有
させておくと、混合前にノルボルネン系単量体の開環重
合が開始するので、通常は、メタセシス触媒と活性剤を
1つの反応原液に共存させることはしない。In this case, since the norbornene-based monomer and the respective components are sufficiently mixed with each other after the reaction stock solutions are mixed and the ring-opening polymerization proceeds, the reaction stock solutions before mixing are
In both cases, it is preferable to contain a norbornene-based monomer. However, when the norbornene-based monomer, the metathesis catalyst, and the activator are contained in the reaction stock solution before mixing, ring-opening polymerization of the norbornene-based monomer starts before mixing, and therefore, normally, The metathesis catalyst and the activator do not coexist in one reaction stock solution.
【0030】用いる反応原液の粘度は格別限定されるも
のではないが、粘度が高すぎても低すぎても、反応原液
間の混合や筒状体内への注入作業が困難になるので、そ
の粘度は、通常50〜2000cps、好ましくは10
0〜1000cpsの範囲内に設定される。図2で示し
た筒状体5の空隙部Bに、上記した反応原液を混合して
成る反応液を注入すると、空隙部Bで、ノルボルネン系
単量体の開環重合反応が進行して発熱し、注入された反
応液は硬化物になる。The viscosity of the reaction stock solution to be used is not particularly limited, but if the viscosity is too high or too low, it becomes difficult to mix the reaction stock solutions and inject it into the cylindrical body. Is usually 50 to 2000 cps, preferably 10
It is set within the range of 0 to 1000 cps. When the reaction solution prepared by mixing the above-mentioned reaction stock solution is injected into the void B of the tubular body 5 shown in FIG. 2, the ring-opening polymerization reaction of the norbornene-based monomer proceeds in the void B to generate heat. Then, the injected reaction liquid becomes a cured product.
【0031】その結果、図3で示したように、接続部A
の外側周面には、接続部Aと被覆層1b,2bを被覆し
て防食保護層6が形成される。その後、最外層の筒状体
4は、剥離除去してもよい。またそのままの状態にして
おいても防食保護層の防食能にとって何の不都合も引き
起こさない。なお、筒状体4の構成樹脂として、反応液
の開環重合に伴って発生する反応熱で融解するような熱
可塑性樹脂、例えば、ポリエチレンをはじめとするポリ
オレフィンやポリスチレンなどを用いると、前記した反
応液の熱硬化過程で筒状体の内表面は融解して反応液と
混合し、冷却後には、形成された防食保護層と密着一体
化するようになり、そのことによって防食能の更なる向
上が図られるので好適である。As a result, as shown in FIG.
On the outer peripheral surface of, the anticorrosion protective layer 6 is formed by covering the connection portion A and the coating layers 1b and 2b. Thereafter, the outermost tubular body 4 may be peeled and removed. Even if it is left as it is, it does not cause any inconvenience to the anticorrosion ability of the anticorrosion protective layer. As the constituent resin of the tubular body 4, a thermoplastic resin that melts by the reaction heat generated by the ring-opening polymerization of the reaction solution, for example, polyolefin such as polyethylene or polystyrene is used. During the thermosetting process of the reaction solution, the inner surface of the tubular body melts and mixes with the reaction solution, and after cooling, it comes into close contact with the formed anticorrosion protective layer, thereby further improving the anticorrosion ability. This is preferable because it can be improved.
【0032】また、本発明方法においては、接続部の外
側に筒状体を配置するに先立ち、当該接続部に、次のよ
うな処置を施すと防食保護効果を一層高めることができ
るので好適である。すなわち、図2で示した接続部Aに
おいて、溶接部3、裸出表面部1a,2a、更に被覆層
1b,2bの外周面に、常用の防食ブライマーを塗布し
たのちその外側に、例えば、ブチル系ゴムを主成分と
し、粘着付与剤(タッキファイヤー)、軟化剤、架橋剤
が配合されている接着性ゴム混和物から成る粘着剤シー
トやテープを巻回したり、または、直接、常用の防食テ
ープを巻回したり、更には従来と同じように熱収縮チュ
ーブを密着被覆したのち、その外側に筒状体を配置し、
ノルボルネン系単量体の重合体から成る防食保護層を形
成すると、反応液の硬化反応時に発熱する熱でこれらホ
ットメルト接着剤が軟化して接続部に強固に接着すると
ともに、形成された硬化層の内面にも強固に接着して、
一層優れた防食保護層が形成される。Further, in the method of the present invention, prior to disposing the tubular body on the outside of the connecting portion, the following treatment may be applied to the connecting portion because the anticorrosion protection effect can be further enhanced. is there. That is, in the connection portion A shown in FIG. 2, after applying a conventional anticorrosion brimer to the outer peripheral surfaces of the welded portion 3, the bare surface portions 1a and 2a, and the coating layers 1b and 2b, for example, butyl Adhesive sheet or tape consisting of adhesive rubber mixture containing tackifier (tackifier), softening agent, and cross-linking agent as main component of system rubber, or wound directly, or directly used anticorrosion tape After winding, or after closely covering the heat-shrinkable tube in the same manner as in the past, place a tubular body on the outside,
When the anticorrosion protective layer made of a polymer of norbornene-based monomer is formed, the hot melt adhesive is softened by the heat generated during the curing reaction of the reaction liquid and firmly adheres to the connection portion, and the formed cured layer is formed. Firmly adhere to the inner surface of
A more excellent anticorrosion protective layer is formed.
【0033】[0033]
実施例1 図1で示した被覆鋼管1,2の接続部(外径216.3m
m,長さ450mm)の外側に、内径265mm、長さ
600mmの熱収縮チューブ4を配置した。したがっ
て、この熱収縮チューブ4の両端部4b,4cは、厚み
2.5mmの被覆層1b,2bと長さ75mmで重なり合
っている。Example 1 The connection portion of the coated steel pipes 1 and 2 shown in FIG. 1 (outer diameter 216.3 m)
m, length 450 mm), a heat-shrinkable tube 4 having an inner diameter of 265 mm and a length of 600 mm was arranged. Therefore, the both ends 4b and 4c of the heat-shrinkable tube 4 have a thickness
It overlaps with the coating layers 1b and 2b of 2.5 mm with a length of 75 mm.
【0034】なお、熱収縮チューブ4の配置に先立ち、
接続部Aの表面にディスクサンダでSIS St−3程
度の下地処理を施し、また被覆層1b,2bの表面を粒
度80番程度のサンドペーパで粗面化しておいた。この
熱収縮チューブ4は、架橋ポリエチレンから成り、50
%の加熱収縮をするチューブであった。Prior to the arrangement of the heat shrink tube 4,
The surface of the connection portion A was subjected to a surface treatment of about SIS St-3 with a disk sander, and the surfaces of the coating layers 1b and 2b were roughened with sandpaper having a grain size of about 80. This heat-shrinkable tube 4 is made of cross-linked polyethylene,
It was a tube having a heat shrinkage of%.
【0035】ついで、熱収縮チューブ4の両端部4b,
4cの位置に相当するプラスチック被覆1a,1bの表
面にブチルゴム系マスチック5a,5bを巻回してそこ
を両端部4b,4bで被包したのち、プロパンガスバー
ナで加熱して当該両端部4b,4cを熱収縮させてマス
チック5a,5bと接着させ、熱収縮チューブ4内に、
図2で示したように、空隙部Bを形成した。Then, both ends 4b of the heat shrinkable tube 4 are
Butyl rubber mastics 5a and 5b are wound around the surfaces of the plastic coatings 1a and 1b corresponding to the position 4c, and the ends 4b and 4b are wrapped with the butyl rubber mastics 5a and 5b, and then the ends 4b and 4c are heated by a propane gas burner. Heat-shrink and adhere to the mastics 5a and 5b, and then heat-shrink tube 4
As shown in FIG. 2, the void B was formed.
【0036】一方、ジシクロペンタジエン75重量部と
非対称型シクロペンタジエン三量体25重量を混合し、
ここにスチレン−イソプレン−スチレンブロック共重合
体(商品名、クレイトン1170、シエル社製)5重量
部、およびフェノール系酸化防止剤(商品名、イルガノ
ックス1010、チバガイギー社製)2重量部を溶解
し、得られた溶液を2つの液に分割し、一方の液には、
1リットル当り、ジエチレンアルミニウムクロリド(活
性剤)40ミリモル、n−プロパノール44ミリモル、
四ケイ素20ミリモルを配合して反応現役Aを調製し、
他方の液には、1リットル当り、トリ(トリデシル)ア
ンモニウムモリブデート(メタセシス触媒)10ミリモ
ルを配合して反応現役Bを調製した。反応現役A,Bは
いずれも温度30℃で待機させた。On the other hand, 75 parts by weight of dicyclopentadiene and 25 parts by weight of asymmetric cyclopentadiene trimer were mixed,
Here, 5 parts by weight of a styrene-isoprene-styrene block copolymer (trade name, Kraton 1170, manufactured by Ciel) and 2 parts by weight of a phenolic antioxidant (trade name, Irganox 1010, manufactured by Ciba Geigy) are dissolved. , The obtained solution is divided into two liquids, one of which is
40 millimoles of diethylene aluminum chloride (activator), 44 millimoles of n-propanol per liter,
Reaction active ingredient A was prepared by blending 20 mmol of tetrasilicon.
To the other solution, 10 mmol of tri (tridecyl) ammonium molybdate (metathesis catalyst) was added per liter to prepare a reaction active material B. Both reaction actives A and B were kept on standby at a temperature of 30 ° C.
【0037】ついで、前記した反応原液Aと反応原液B
の同容量を反応射出成形機を用いて混合して反応液と
し、それをただちに、熱収縮チューブ4の注入口4aか
ら空隙部Bに注入した。5分経過後には、接続部Aとポ
リエチレン被覆層1b,2bの外側に、アイゾット衝撃
強さが40kg・cm/cmである非常に硬い防食保護
層が形成された。Then, the above-mentioned reaction stock solution A and reaction stock solution B were prepared.
The same volume was mixed using a reaction injection molding machine to form a reaction liquid, which was immediately injected into the void B from the injection port 4a of the heat shrinkable tube 4. After 5 minutes, a very hard anticorrosion protective layer having an Izod impact strength of 40 kg · cm / cm was formed on the outside of the connection portion A and the polyethylene coating layers 1b and 2b.
【0038】ついで、防食保護層が形成されている個所
を屋外の水槽中に1ヵ月間浸漬したのち取り出し、メガ
オームメータを用いて防食保護層の絶縁抵抗を測定し、
ついで防食保護層を剥離して接続部Aを表出させ、その
表出面における発錆の有無を目視観察した。絶縁抵抗は
1010Ω・m2 と非常に大きく、また発錆は全く認めら
れなかった。Then, the place where the anticorrosion protective layer is formed is immersed in an outdoor water tank for one month and then taken out, and the insulation resistance of the anticorrosion protective layer is measured using a mega ohm meter.
Then, the anticorrosion protective layer was peeled off to expose the connection part A, and the presence or absence of rust on the exposed surface was visually observed. The insulation resistance was very large at 10 10 Ω · m 2, and no rusting was observed.
【0039】実施例2 接続部Aとポリエチレン被覆層1b,2bの外側を、長
さ450mm、内径が265mmで内面に厚み0.6mm
のブチルゴム系粘着層が形成されているポリエチレン系
熱収縮チューブ(厚み1.2mm)で密着被覆したことを
除いては、実施例1と同様にして防食保護層を形成し
た。Example 2 The outside of the connecting portion A and the polyethylene coating layers 1b and 2b was 450 mm in length, 265 mm in inner diameter, and 0.6 mm in thickness on the inner surface.
The anticorrosion protective layer was formed in the same manner as in Example 1 except that the polyethylene heat-shrinkable tube (thickness: 1.2 mm) on which the butyl rubber-based pressure-sensitive adhesive layer was adhered was coated.
【0040】この場合、実施例1と同様の使用で絶縁抵
抗と発錆状況を調べた。絶縁抵抗は約1010Ω・m2 で
あり、発錆は全く認められなかった。In this case, the insulation resistance and the rusting condition were examined by the same use as in Example 1. The insulation resistance was about 10 10 Ω · m 2 , and no rusting was observed.
【0041】[0041]
【発明の効果】請求項1の方法では、金属管の接続部に
防食保護層を形成するに際し、従来の金型に代えて熱可
塑性樹脂の筒状体で金属管の接続部を配置するので、従
来のように、重い金型の輸送、配置、取り外し、また清
掃などの作業は不要になり、現場での施工能率は非常に
高くなる。また、反応液がノルボルネン系単量体とメタ
セシス触媒と活性剤とから成るので、非常に短時間で、
防食能が優れている防食保護層を形成することができ
る。According to the method of the present invention, when the anticorrosion protective layer is formed on the connection portion of the metal pipe, the connection portion of the metal pipe is arranged by the tubular body of thermoplastic resin instead of the conventional mold. The work of transporting, arranging, removing, and cleaning heavy dies is no longer required as in the prior art, and the construction efficiency at the site is extremely high. Further, since the reaction liquid is composed of the norbornene-based monomer, the metathesis catalyst and the activator, it takes a very short time,
It is possible to form an anticorrosion protective layer having excellent anticorrosion ability.
【0042】請求項2、請求項6の方法の場合は、形成
される防食保護層が互いに密着する複数層になっている
ので全体としての防食能は更に向上する。請求項3の方
法では筒状体として熱収縮チューブを用いるので、反応
液の硬化過程では形成されつつある防食保護層を常時緊
締する力が作用し続けるので、注入される反応液の液漏
れを防止するとともに防食保護層と接続部との密着性を
高めることができる。In the case of the methods of claims 2 and 6, since the formed anticorrosion protective layers are a plurality of layers in close contact with each other, the overall anticorrosion ability is further improved. In the method of claim 3, since the heat-shrinkable tube is used as the cylindrical body, the force for constantly tightening the anticorrosion protective layer that is being formed continues to act during the curing process of the reaction solution, so that the leakage of the injected reaction solution is prevented. It is possible to prevent it and improve the adhesion between the anticorrosion protective layer and the connecting portion.
【0043】請求項4の方法では、熱収縮チューブの両
端部のみが収縮して金属管の接続部と密着するので、筒
状体に反応液を注入したときに液洩れは起こらないよう
になる。請求項5の方法の場合には、筒状体の両端部と
粘着剤層とが液密に接着するので、反応液の液洩れを確
実に防止することができる。In the method of the fourth aspect, only the both ends of the heat-shrinkable tube shrink and come into close contact with the connecting portion of the metal tube, so that liquid leakage does not occur when the reaction solution is injected into the tubular body. . In the case of the method of claim 5, since both ends of the tubular body and the adhesive layer are liquid-tightly adhered to each other, liquid leakage of the reaction liquid can be reliably prevented.
【図1】被覆金属管を互いの管端で溶接した状態を示す
部分断面図である。FIG. 1 is a partial cross-sectional view showing a state in which coated metal pipes are welded to each other at their pipe ends.
【図2】図1の接続部の外側に筒状体を配置した状態を
示す部分断面図である。FIG. 2 is a partial cross-sectional view showing a state in which a tubular body is arranged outside the connection portion of FIG.
【図3】接続部に防食保護層を形成した状態を示す部分
断面図である。FIG. 3 is a partial cross-sectional view showing a state in which an anticorrosion protective layer is formed on a connection portion.
1,2 被覆金属管 1a,2a 被覆金属管1,2の裸出表面部 1b,2b 被覆層 3 溶接部 4 熱可塑性樹脂の筒状体 4a 反応液の注入口 4b,4c 筒状体4の両端部 4d 空気孔 5a,5b 粘着剤層 6 防食保護層 A 接続部 B 空隙部 1, 2 Coated metal pipe 1a, 2a Bare metal surface 1b, 2b Coated metal pipe 1, 2b Coating layer 3 Welded portion 4 Thermoplastic resin cylinder 4a Reactant injection port 4b, 4c Cylindrical body 4 Both ends 4d Air holes 5a, 5b Adhesive layer 6 Corrosion protection layer A Connection part B Void part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 東保 和男 東京都千代田区丸の内2丁目6番1号 日 本ゼオン株式会社内 (72)発明者 山本 誠 神奈川県川崎市川崎区夜光1丁目2番1号 日本ゼオン株式会社総合開発センター内 (72)発明者 谷本 博利 神奈川県川崎市川崎区夜光1丁目2番1号 日本ゼオン株式会社総合開発センター内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuo Toho 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Zeon Co., Ltd. (72) Inventor Makoto Yamamoto 1-2-1, Yokou, Kawasaki-ku, Kanagawa No. ZEON Corporation, R & D Center (72) Inventor Hirotoshi Tanimoto 1-2-1, Yokou, Kawasaki-ku, Kawasaki-shi, Kanagawa ZEON Corporation, R & D Center
Claims (6)
に位置する金属管の裸出表面部を含む金属管の接続部を
被包して熱可塑性樹脂から成る筒状体を配置し、前記接
続部と前記筒状体が形成する空隙部に、ノルボルネン系
単量体、メタセシス触媒、および活性剤を含む反応液を
注入したのち前記反応液を硬化して前記接続部を被覆す
る防食保護層を形成することを特徴とする金属管接続部
の防食保護方法。1. A tubular body made of a thermoplastic resin is disposed so as to cover a welded portion of a metal pipe and a connecting portion of the metal pipe including a bare exposed surface portion of the metal pipe located on both sides of the welded portion. , An anticorrosion coating the connection portion by injecting a reaction liquid containing a norbornene-based monomer, a metathesis catalyst, and an activator into the void formed by the connection portion and the tubular body, and then curing the reaction liquid. A method for protecting a metal pipe connecting portion from corrosion by forming a protective layer.
の層とその表面に融着する前記筒状体の層とから成る請
求項1の金属管接続部の防食保護方法。2. The anticorrosion protection method for a metal pipe connecting portion according to claim 1, wherein the anticorrosion protection layer comprises a layer of a cured product of the reaction solution and a layer of the tubular body fused to the surface thereof.
項1の金属管接続部の防食保護方法。3. The anticorrosion protection method for a metal pipe connecting portion according to claim 1, wherein the tubular body is a heat-shrinkable tube.
い、前記熱収縮チューブを前記接続部に配置したのち、
前記熱収縮チューブの両端部のみを選択的に加熱して熱
収縮させ、前記熱収縮チューブの両端部のみを前記接続
部に密着させる請求項1の金属管接続部の防食保護方
法。4. A heat-shrinkable tube is used as the tubular body, and the heat-shrinkable tube is arranged at the connection portion,
The anticorrosion protection method for a metal pipe connecting portion according to claim 1, wherein only both end portions of the heat shrinkable tube are selectively heated to cause heat shrinkage, and only both end portions of the heat shrinkable tube are brought into close contact with the connecting portion.
し、前記筒状体の両端部が接触する前記接続部の個所
に、粘着剤層を設けておく請求項1の金属管接続部の防
食保護方法。5. The metal pipe connecting portion according to claim 1, wherein an adhesive layer is provided at a portion of the connecting portion where both ends of the tubular body come into contact when the tubular body is arranged in the connecting portion. Anticorrosion protection method.
を配置するに先立ち、少なくとも前記接続部の外周に
は、防食プライマーを施したのちに行われる粘着剤シー
トの巻回処理、防食テープの巻回処理、または熱収縮チ
ューブの密着被覆処理のいずれか1つの処理が施されて
いることを特徴とする金属管接続部の防食保護方法。6. The winding treatment of the pressure-sensitive adhesive sheet, which is performed after applying an anticorrosive primer to at least the outer periphery of the connecting portion prior to disposing the tubular body on the connecting portion of the metal tube according to claim 1. 1. A method for preventing corrosion of a metal pipe connecting portion, wherein any one of a winding treatment of an anticorrosion tape and an adhesion coating treatment of a heat-shrinkable tube is performed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27261895A JP3779756B2 (en) | 1995-10-20 | 1995-10-20 | Anticorrosion protection method for metal pipe connections |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27261895A JP3779756B2 (en) | 1995-10-20 | 1995-10-20 | Anticorrosion protection method for metal pipe connections |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09108624A true JPH09108624A (en) | 1997-04-28 |
JP3779756B2 JP3779756B2 (en) | 2006-05-31 |
Family
ID=17516449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27261895A Expired - Lifetime JP3779756B2 (en) | 1995-10-20 | 1995-10-20 | Anticorrosion protection method for metal pipe connections |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3779756B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006194368A (en) * | 2005-01-14 | 2006-07-27 | Nippon Steel Corp | Anticorrosive coating structure for site welded part |
JP2013204789A (en) * | 2012-03-29 | 2013-10-07 | Chugoku Electric Power Co Inc:The | Leak prevention cover for piping |
CN111089203A (en) * | 2019-03-29 | 2020-05-01 | 青岛海尔电冰箱有限公司 | Sealing method for refrigerating system pipeline |
WO2023070869A1 (en) * | 2021-10-29 | 2023-05-04 | 临海伟星新型建材有限公司 | Steel wire mesh reinforced composite pipe high-voltage connector, and manufacturing method therefor |
-
1995
- 1995-10-20 JP JP27261895A patent/JP3779756B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006194368A (en) * | 2005-01-14 | 2006-07-27 | Nippon Steel Corp | Anticorrosive coating structure for site welded part |
JP2013204789A (en) * | 2012-03-29 | 2013-10-07 | Chugoku Electric Power Co Inc:The | Leak prevention cover for piping |
CN111089203A (en) * | 2019-03-29 | 2020-05-01 | 青岛海尔电冰箱有限公司 | Sealing method for refrigerating system pipeline |
WO2023070869A1 (en) * | 2021-10-29 | 2023-05-04 | 临海伟星新型建材有限公司 | Steel wire mesh reinforced composite pipe high-voltage connector, and manufacturing method therefor |
Also Published As
Publication number | Publication date |
---|---|
JP3779756B2 (en) | 2006-05-31 |
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