JP2002188767A - Internal corrosive-resistant pipe joint - Google Patents
Internal corrosive-resistant pipe jointInfo
- Publication number
- JP2002188767A JP2002188767A JP2000393106A JP2000393106A JP2002188767A JP 2002188767 A JP2002188767 A JP 2002188767A JP 2000393106 A JP2000393106 A JP 2000393106A JP 2000393106 A JP2000393106 A JP 2000393106A JP 2002188767 A JP2002188767 A JP 2002188767A
- Authority
- JP
- Japan
- Prior art keywords
- pipe joint
- resin
- coating layer
- resin coating
- density
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は金属製管継手の内面
に樹脂被覆層を設けた内面防食管継手に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner corrosion-resistant pipe joint in which a resin coating layer is provided on the inner surface of a metal pipe joint.
【０００２】[0002]
【従来の技術】給水または給湯用の配管系に内面及び／
または外面を樹脂でライニングした鋼管を使用する場合
には、金属製管継手の内面及びライニング鋼管の管端の
鉄地露出部の腐食を防ぐために、管継手の内面に樹脂被
覆層を施すことが行われている。この種継手としては、
例えば鋳鉄製管継手の内面に射出成形によって塩化ビニ
ル樹脂被覆層を設けたものが一般的である。塩化ビニル
樹脂は成形収縮率が小さいので、単に管継手の内面に射
出成形により塩化ビニル樹脂層を形成するだけでも、管
継手の内面と塩化ビニル樹脂被覆層との密着性は実用的
には充分である。しかし近年ダイオキシン等による環境
汚染に対する配慮から、ハロゲン元素を含有する塩化ビ
ニル樹脂はその使用が制限されてきている。そのために
管継手の内面の樹脂被覆層を形成する樹脂として塩化ビ
ニル樹脂の代わりにハロゲン元素を含有しない樹脂、例
えばポリオレフィン系樹脂を使用することが試みられて
いる。2. Description of the Related Art An inner surface and / or
Or, when using a steel pipe whose outer surface is lined with resin, a resin coating layer may be applied to the inner surface of the pipe joint to prevent corrosion of the inner surface of the metal pipe joint and the exposed portion of the steel at the pipe end of the lining steel pipe. Is being done. As this kind of joint,
For example, it is common that a cast iron pipe joint is provided with a vinyl chloride resin coating layer on the inner surface by injection molding. Since vinyl chloride resin has a low molding shrinkage, simply forming the vinyl chloride resin layer by injection molding on the inner surface of the pipe joint will provide sufficient adhesion between the inner surface of the pipe joint and the vinyl chloride resin coating layer for practical use. It is. However, in recent years, the use of vinyl chloride resins containing halogen elements has been restricted in consideration of environmental pollution due to dioxins and the like. Therefore, it has been attempted to use a resin containing no halogen element, for example, a polyolefin-based resin instead of a vinyl chloride resin as the resin for forming the resin coating layer on the inner surface of the pipe joint.
【０００３】しかし、このポリオレフィン系樹脂は結晶
性樹脂であるため、従来多用されていた塩化ビニル樹脂
に比して成形収縮率が大きく、これを射出成形した後冷
却固化する間に樹脂の結晶化及び収縮によって管継手の
内面と樹脂被覆層との間に空隙が形成され密着性が低下
するという問題がある。これを解消するため、管継手内
面と樹脂被覆層との間に接着剤を介在させて、管継手内
面と樹脂被覆層との密着性を確保することが行われてい
る。However, since this polyolefin resin is a crystalline resin, its molding shrinkage is higher than that of a vinyl chloride resin which has been widely used in the past. Further, there is a problem that a gap is formed between the inner surface of the pipe joint and the resin coating layer due to the shrinkage, and the adhesion is reduced. In order to solve this problem, an adhesive is interposed between the inner surface of the pipe joint and the resin coating layer to ensure the adhesion between the inner surface of the pipe joint and the resin coating layer.
【０００４】[0004]
【発明が解決しようとする課題】上記接着剤としては、
親水性を有する金属製管継手と親油性を有するポリオレ
フィン系樹脂の双方になじみやすい両親媒性物質である
変性ポリオレフィン系樹脂が使用される。管継手の内面
とポリオレフィン系樹脂被覆層との間に接着剤を介在さ
せると、接着剤とポリオレフィン系樹脂との間の接着力
は大きいので、短期的な密着性は確保できる。しかし、
管継手内面と接着剤との間の接着力は十分でなく、成形
後のポリオレフィン系樹脂の収縮により管継手と接着層
の間に残留応力が生じ、接着性能が経時的に低下し、ひ
いては樹脂被覆層が管継手から剥離してしまう。したが
って、樹脂被覆層が不安定な（剥離し易い）状態で形成
されていると、管継手とライニング鋼管との正常な接合
ができず、十分な防食性能が得られないという問題を招
来する。本発明は上記した課題を解決して、管継手の内
面とポリオレフィン系樹脂被覆層との間の密着性が十分
確保され、長期間に亘り樹脂被覆層の剥離が生じない内
面防食管継手を提供することを目的とする。The above-mentioned adhesives include:
A modified polyolefin-based resin that is an amphipathic substance that is easily compatible with both a metal pipe fitting having hydrophilicity and a polyolefin-based resin having lipophilicity is used. When an adhesive is interposed between the inner surface of the pipe joint and the polyolefin-based resin coating layer, short-term adhesion can be ensured because the adhesive force between the adhesive and the polyolefin-based resin is large. But,
The adhesive strength between the inner surface of the pipe joint and the adhesive is not sufficient, and a residual stress is generated between the pipe joint and the adhesive layer due to shrinkage of the molded polyolefin resin, and the adhesive performance decreases over time, and as a result, The coating layer peels off from the pipe joint. Therefore, if the resin coating layer is formed in an unstable (easily peeled) state, a normal joint between the pipe joint and the lining steel pipe cannot be performed, which causes a problem that sufficient anticorrosion performance cannot be obtained. The present invention solves the above-mentioned problems, and provides an inner corrosion-resistant pipe joint in which the adhesion between the inner surface of the pipe joint and the polyolefin-based resin coating layer is sufficiently ensured and the resin coating layer does not peel off for a long time. The purpose is to do.
【０００５】[0005]
【課題を解決するための手段】配管分野では、防食のた
めのポリオレフィン系樹脂としては、ポリエチレン樹脂
が多用されており、ポリエチレン樹脂は結晶性の熱可塑
性樹脂であって、その密度により高密度ポリエチレンと
低密度ポリエチレンとに大別される。本発明者らは、ポ
リオレフィン系樹脂の密度および結晶化度に注目し、各
種ポリエチレン樹脂を用いて金属製管継手の内面に樹脂
被覆層を形成した結果、高密度ポリエチレンでは被覆層
が剥離し易いが、低密度ポリエチレンでは被覆層の剥離
が生じないことを知見し、本発明に至った。すなわち、
本発明の内面防食管継手は、金属製管継手の内面に樹脂
被覆層を設けた内面防食管継手であって、樹脂被覆層は
９００〜９４０ｋｇ／ｍ3の範囲の密度、あるいは結晶
化度が３４〜６２％であるポリオレフィン系樹脂からな
ることを特徴とするものである。ここで、結晶化度は、
結晶相の体積比率で、密度と以下の関係がある。 結晶化度（％）＝｛1.000（d−0.856）/d(1.000-0.856)｝×100 （ｄ：密度） ただし、密度は着色顔料、充填材（一般には硫酸バリウ
ム、タルク、マイカ、ガラスファイバー等がある）など
の添加成分の種類、量により大きく変わるため、本発明
に係る密度は、樹脂成分自体の密度を意味し、さらに室
温での密度である。本発明において、樹脂被覆層の密度
が９００ｋｇ／ｍ3未満であると、結晶化度が３４％未
満となり、水道水中に含まれる塩素が非結晶部分に浸入
し樹脂の酸化劣化を引き起こし、水質に悪影響を与え
る。また、密度が９4０ｋｇ／ｍ3越えると、樹脂被覆層
が剥離し防食性能が損なわれる。以上の理由で樹脂被覆
層の密度を上記範囲とする。密度は、ＪＩＳ Ｋ ７１
１２に記載の方法に準じて測定した値である。本発明に
おいて、樹脂被覆層はポリオレフィン系樹脂のみでも形
成できるが、被覆樹脂自体の密度が上記範囲であれば、
他の材料（例えば着色顔料、酸化防止剤、充填材）を添
加することができる。但しその場合には、添加剤の含有
量は、1質量％以下とすることが望ましいが、それらの
含有量が必要以上に多いと水質に悪影響を及ぼす虞があ
る。In the field of piping, polyethylene resin is frequently used as a polyolefin resin for anticorrosion, and the polyethylene resin is a crystalline thermoplastic resin. And low-density polyethylene. The present inventors have paid attention to the density and crystallinity of the polyolefin resin, and as a result of forming a resin coating layer on the inner surface of a metal pipe joint using various polyethylene resins, the coating layer is easily peeled with high-density polyethylene. However, they have found that low-density polyethylene does not cause peeling of the coating layer, and have reached the present invention. That is,
The inner corrosion-resistant pipe joint of the present invention is an inner corrosion-resistant pipe joint in which a resin coating layer is provided on the inner surface of a metal pipe joint, and the resin coating layer has a density in the range of 900 to 940 kg / m 3 or a degree of crystallinity. 34 to 62% of a polyolefin resin. Here, the crystallinity is
The volume ratio of the crystal phase has the following relationship with the density. Crystallinity (%) = {1.000 (d-0.856) / d (1.000-0.856)} x 100 (d: density) where density is the color pigment and filler (generally barium sulfate, talc, mica, glass fiber) The density according to the present invention means the density of the resin component itself, and furthermore, is the density at room temperature. In the present invention, when the density of the resin coating layer is less than 900 kg / m 3 , the degree of crystallinity becomes less than 34%, chlorine contained in tap water penetrates into the non-crystalline portion to cause oxidative deterioration of the resin, and Has a negative effect. On the other hand, when the density exceeds 9400 kg / m 3 , the resin coating layer is peeled off, and the anticorrosion performance is impaired. For the above reasons, the density of the resin coating layer is set in the above range. The density is JIS K71
This is a value measured according to the method described in No. 12. In the present invention, the resin coating layer can be formed with only a polyolefin resin, but if the density of the coating resin itself is in the above range,
Other materials (eg, color pigments, antioxidants, fillers) can be added. However, in such a case, the content of the additive is desirably 1% by mass or less. However, if the content of these additives is more than necessary, the water quality may be adversely affected.
【０００６】本発明において、ポリオレフィン系樹脂と
しては、ポリエチレンに限らず、例えばポリプロピレ
ン、ポリブテン、ポリメチルペンテンなども用い得る。
これらの樹脂のうちでは、水道水中に含まれる塩素に対
する抵抗力及び価格の点から、ポリエチレンまたはポリ
プロピレンを使用することが好ましく、特にポリエチレ
ンが好ましい。また、本発明においては、一種類のオレ
フィン系樹脂で樹脂被覆層を形成できるが、二種以上の
オレフィン系樹脂を用いて樹脂被覆層を形成することも
できる。更に本発明においては、樹脂被覆層が管継手か
ら離脱するのを確実に防止するために、樹脂被覆層と管
継手との間に接着層を有することが望ましい。In the present invention, the polyolefin resin is not limited to polyethylene, but may be, for example, polypropylene, polybutene, polymethylpentene, or the like.
Among these resins, it is preferable to use polyethylene or polypropylene from the viewpoint of resistance to chlorine contained in tap water and price, and polyethylene is particularly preferable. Further, in the present invention, the resin coating layer can be formed by one kind of olefin-based resin, but the resin coating layer can be formed by using two or more kinds of olefin-based resins. Further, in the present invention, it is desirable to have an adhesive layer between the resin coating layer and the pipe joint in order to reliably prevent the resin coating layer from separating from the pipe joint.
【０００７】上記構成によれば、管継手の内面とポリオ
レフィン系樹脂被覆層との間の密着性が確保され、長期
間に亘り樹脂被覆層の剥離が生じない内面防食管継手を
得ることができる。これは、ポリオレフィン系樹脂とし
てポリエチレンを用いかつ管継手内面に接着層を形成し
てから被覆層を形成する場合について説明すると、次の
理由によるものと推察される。射出成形時の溶融状態で
は、高密度ポリエチレンと低密度ポリエチレンはいずれ
も、一定圧力下の比容積はほぼ同じである。しかし、冷
却固化後の密度は、低密度ポリエチレンでは９１０ｋｇ
／ｍ3程度で、高密度ポリエチレンでは９５０ｋｇ／ｍ3
程度となる。この密度を支配するのは、比容積が小さい
結晶相と比容積が大きい非結晶相の体積分率で表される
結晶化度である。したがって、射出成形後の冷却固化過
程での収縮率は、高密度ポリエチレンは大きいが、低密
度ポリエチレンは小さくなる。すなわち、ポリエチレン
の密度が小さい程、冷却終了時の収縮量と冷却開始時の
収縮量との差は小さく、管継手とその内面に形成された
接着層の間の残留応力は小さくなる。その結果、低密度
ポリエチレンを使用することにより、長期間に亘って継
手と樹脂被覆層間の密着性が確保される。[0007] According to the above configuration, the adhesion between the inner surface of the pipe joint and the polyolefin-based resin coating layer is ensured, and an inner corrosion-resistant pipe joint that does not cause peeling of the resin coating layer for a long period of time can be obtained. . This is presumed to be due to the following reason when the case where polyethylene is used as the polyolefin resin and an adhesive layer is formed on the inner surface of the pipe joint before forming the coating layer. In the molten state during injection molding, both high-density polyethylene and low-density polyethylene have substantially the same specific volume under a constant pressure. However, the density after cooling and solidification is 910 kg for low density polyethylene.
/ M 3 , and 950 kg / m 3 for high density polyethylene
About. What governs this density is the crystallinity expressed by the volume fraction of the crystalline phase having a small specific volume and the amorphous phase having a large specific volume. Accordingly, the high-density polyethylene has a large shrinkage during the cooling and solidification process after injection molding, but has a small shrinkage in the low-density polyethylene. That is, the smaller the density of polyethylene, the smaller the difference between the amount of shrinkage at the end of cooling and the amount of shrinkage at the start of cooling, and the smaller the residual stress between the pipe joint and the adhesive layer formed on its inner surface. As a result, by using low-density polyethylene, the adhesion between the joint and the resin coating layer is ensured for a long period of time.
【０００８】[0008]
【発明の実施の形態】次に本発明の実施の形態を添付図
面を参照して説明する。図１は本発明の内面防食管継手
を形成する射出成形時の状態を示す断面図であり、図２
は本発明の内面防食管継手を示す断面図である。図１に
おいて、１は金属製管継手であり、その中に互いの先端
部が密着するようにマンドレル２、３が挿入されてい
る。マンドレル２には、図示しない射出成形機の出口に
連通するランナ４とその先端部にゲート５が設けられて
いる。射出成形機から供給された溶融樹脂は、ランナ４
及びゲート５から管継手１とマンドレル２、３とで形成
された成形空間６内に充填され、溶融樹脂が冷却・固化
したときにマンドレル２、３を後退させることにより、
図２に示す管継手１の内面に樹脂被覆層７を有する内面
防食管継手が形成される。この内面防食管継手において
は、樹脂被覆層７が管継手１の内面と接触する部分に接
着層８が設けられ、樹脂被覆層７と管継手１との密着性
が向上するように構成されている。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing a state at the time of injection molding for forming the inner corrosion-resistant pipe joint of the present invention, and FIG.
1 is a cross-sectional view showing an inner corrosion-resistant pipe joint of the present invention. In FIG. 1, reference numeral 1 denotes a metal pipe joint, into which mandrels 2 and 3 are inserted so that their tips are in close contact with each other. The mandrel 2 is provided with a runner 4 communicating with an outlet of an injection molding machine (not shown) and a gate 5 at a tip end thereof. The molten resin supplied from the injection molding machine
By filling the molding space 6 formed by the pipe joint 1 and the mandrels 2 and 3 from the gate 5 and retreating the mandrels 2 and 3 when the molten resin is cooled and solidified,
An inner corrosion-resistant pipe joint having a resin coating layer 7 on the inner surface of the pipe joint 1 shown in FIG. 2 is formed. In this internal corrosion protection pipe joint, an adhesive layer 8 is provided at a portion where the resin coating layer 7 comes into contact with the inner surface of the pipe joint 1, so that the adhesion between the resin coating layer 7 and the pipe joint 1 is improved. I have.
【０００９】上記の内面防食管継手において、樹脂被覆
層７には円環状の突出部７１が設けられ、この突出部７
１の外周面と管継手１の内面とでリセス７２が形成され
ている。樹脂ライニング鋼管１０と管継手１とを接続す
るときは、リセス７２内に樹脂ライニング鋼管１０の先
端部をねじ込み、樹脂ライニング鋼管１０の樹脂被覆層
１１を管継手１の樹脂被覆層７の突出部７１に押し当て
ることにより、樹脂ライニング鋼管１０及び管継手１の
樹脂被覆層同士によるシールが行なわれる。In the above-described inner surface corrosion-resistant pipe joint, the resin coating layer 7 is provided with an annular projection 71.
1 and an inner surface of the pipe joint 1 form a recess 72. When connecting the resin-lined steel pipe 10 and the pipe joint 1, the tip of the resin-lined steel pipe 10 is screwed into the recess 72, and the resin coating layer 11 of the resin-lined steel pipe 10 is connected to the protrusion of the resin coating layer 7 of the pipe joint 1. By pressing against the resin 71, sealing between the resin coating layers of the resin-lined steel pipe 10 and the pipe joint 1 is performed.
【００１０】[0010]
【実施例】呼び径２５Ａの可鍛鋳鉄製ソケットの内面に
変性ポリエチレンを約０．１ｍｍの厚さに塗布して接着
層を形成した後、密度が９００、９１０、９２０、９３
０、９３６ｋｇ／ｍ3（結晶化度はそれぞれ３４％、４
１％、４８％、５５％、５９％）である5種類のポリエ
チレン樹脂、および密度９１０ｋｇ／ｍ3（結晶化度４
１％）のポリプロピレン樹脂をそれぞれ射出成形して図
２に示す内面防食管継手を作製した。上記各樹脂ごとに
５０個の内面防食管継手を準備し、これらを用いてヒー
トサイクル試験機により−１０℃⇔６０℃を１００サイ
クル繰り返す試験を行った。ヒートサイクル試験後の内
面防食管継手を切断して、金属継手と樹脂被覆層との密
着状態を調査した。さらに、ヒートサイクル試験後の内
面防食継手５個の両側にパイプ（樹脂ライニング鋼管）
を接合し、これらの内部に濃度３質量％の食塩水を封入
し、４週間放置した。４週間後、封入試験水中の鉄量の
定量分析を誘導結合高周波プラズマ発光分光分析（ＩＣ
Ｐ）により行った。これらの試験結果をまとめて表１に
示す。比較例として、密度が９５０ｋｇ／ｍ3（結晶化
度６９％）の高密度ポリエチレンを用いて樹脂被覆層を
形成した以外は上記と同様の条件で内面防食管継手を作
製し、上記と同様の試験を行った。その試験結果は同じ
く表１に示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS Modified polyethylene was applied to the inner surface of a malleable cast iron socket having a nominal diameter of 25 A to a thickness of about 0.1 mm to form an adhesive layer, and the density was 900, 910, 920, 93
0, 936 kg / m 3 (crystallinity is 34%, 4
1%, 48%, 55%, and 59%), and a density of 910 kg / m 3 (crystallinity 4
1%) of a polypropylene resin was injection molded to produce an inner corrosion-resistant pipe joint shown in FIG. Fifty inner corrosion-resistant pipe joints were prepared for each of the above resins, and a test in which -10 ° C / 60 ° C was repeated 100 times using a heat cycle tester was performed using these. The inner anticorrosion pipe joint after the heat cycle test was cut, and the state of adhesion between the metal joint and the resin coating layer was investigated. Furthermore, pipes (resin-lined steel pipes) on both sides of the five inner corrosion-resistant joints after the heat cycle test
Were sealed, and a saline solution having a concentration of 3% by mass was sealed therein, and left for 4 weeks. Four weeks later, quantitative analysis of the amount of iron in the test water was performed by inductively coupled high-frequency plasma emission spectroscopy (IC
P). Table 1 summarizes the test results. As a comparative example, an inner anticorrosion pipe joint was produced under the same conditions as above except that a resin coating layer was formed using high-density polyethylene having a density of 950 kg / m 3 (crystallinity 69%). The test was performed. The test results are also shown in Table 1.
【００１１】 [0011]
【００１２】表1から明らかなように、密度が９００〜
９３６ｋｇ／ｍ3のポリエチレン樹脂および密度が９１
０ｋｇ／ｍ3のポリプロピレン樹脂を用いて樹脂被覆樹
脂層を形成した場合（実施例１〜６）には、継手と樹脂
被覆層との密着性が良好で、防食性能に優れた内面防食
継手が得られることがわかる。一方高密度ポリエチレン
樹脂を用いて被覆樹脂層を形成した場合（比較例）に
は、継手と被覆樹脂層との密着性が弱く、そのため食塩
水が金属継手内面と被覆樹脂層の間に浸入し、防食性能
を低下させていることがわかる。As is apparent from Table 1, the density is 900 to
936 kg / m 3 polyethylene resin and density 91
When the resin-coated resin layer was formed using 0 kg / m 3 of polypropylene resin (Examples 1 to 6), an inner corrosion-resistant joint having good adhesion between the joint and the resin coating layer and excellent in anticorrosion performance was obtained. It can be seen that it can be obtained. On the other hand, when the coating resin layer is formed using a high-density polyethylene resin (Comparative Example), the adhesion between the joint and the coating resin layer is weak, so that the saline solution enters between the inner surface of the metal joint and the coating resin layer. It can be seen that the anticorrosion performance was reduced.
【００１３】[0013]
【発明の効果】以上に記述の如く、本発明によれば、金
属製管継手の内面に特定の密度（結晶化度）を有するポ
リオレフィン系樹脂を被覆するので、管継手の内面と樹
脂被覆層との密着性が確保され、長期に亘って樹脂被覆
層の剥離が生じない内面防食管継手を得ることができ
る。その結果、環境汚染を伴わずに、防食性能に優れる
配管を実現することができる。As described above, according to the present invention, since the inner surface of a metal pipe joint is coated with a polyolefin resin having a specific density (crystallinity), the inner surface of the pipe joint and the resin coating layer are coated. And an inner corrosion-resistant pipe joint in which the resin coating layer does not peel off for a long period of time can be obtained. As a result, it is possible to realize a pipe having excellent anticorrosion performance without causing environmental pollution.
【図１】本発明に係わる内面防食管継手とマンドレルの
関連を示す断面図である。FIG. 1 is a cross-sectional view showing the relationship between an inner corrosion-resistant pipe joint and a mandrel according to the present invention.
【図２】本発明に係わる内面防食管継手と被接続管の関
連を示す断面図である。FIG. 2 is a cross-sectional view showing a relation between an inner corrosion-resistant pipe joint and a connected pipe according to the present invention.
１ 管継手、２、３ マンドレル、７ 樹脂被覆層、８
接着層、７１ 突出部、1 pipe joint, 2, 3 mandrel, 7 resin coating layer, 8
Adhesive layer, 71 protrusion,
フロントページの続き Ｆターム(参考） 3H013 JB05 4F100 AB01A AK03B AK06B AK07B BA02 BA03 BA07 BA10A BA10B CB00C DA17 DD31 GB90 JA05B JA13B JB02 YY00B Continued on the front page F term (reference) 3H013 JB05 4F100 AB01A AK03B AK06B AK07B BA02 BA03 BA07 BA10A BA10B CB00C DA17 DD31 GB90 JA05B JA13B JB02 YY00B
Claims (6)
た内面防食管継手であって、樹脂被覆層は９００〜９４
０ｋｇ／ｍ3の範囲の密度を有し、ポリオレフィン系樹
脂からなることを特徴とする内面防食管継手。An inner corrosion-resistant pipe joint in which a resin coating layer is provided on an inner surface of a metal pipe joint, wherein the resin coating layer is 900 to 94.
An inner corrosion-resistant pipe joint having a density in the range of 0 kg / m 3 and made of a polyolefin resin.
た内面防食管継手であって、樹脂被覆層は３４〜６２％
の範囲の結晶化度を有し、ポリオレフィン系樹脂からな
ることを特徴とする内面防食管継手。2. An inner corrosion-resistant pipe joint in which a resin coating layer is provided on an inner surface of a metal pipe joint, wherein the resin coating layer is 34 to 62%.
Characterized in that it has a crystallinity within the range described above and is made of a polyolefin resin.
フィン系樹脂からなることを特徴とする請求項1に記載
の内面防食管継手。3. The internal corrosion protection pipe joint according to claim 1, wherein the resin coating layer is made of one or more olefin-based resins.
主体とすることを特徴とする請求項１に記載の内面防食
管継手。4. The internal corrosion protection pipe joint according to claim 1, wherein the resin coating layer is mainly composed of a low density polyethylene resin.
とすることを特徴とする請求項1に記載の内面防食管継
手。5. The internal corrosion protection pipe joint according to claim 1, wherein the resin coating layer is mainly composed of a polypropylene resin.
を有することを特徴とする請求項１に記載の内面防食管
継手。6. The internal corrosion protection pipe joint according to claim 1, further comprising an adhesive layer between the resin coating layer and the metal joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000393106A JP2002188767A (en) | 2000-12-25 | 2000-12-25 | Internal corrosive-resistant pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000393106A JP2002188767A (en) | 2000-12-25 | 2000-12-25 | Internal corrosive-resistant pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002188767A true JP2002188767A (en) | 2002-07-05 |
Family
ID=18858979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000393106A Pending JP2002188767A (en) | 2000-12-25 | 2000-12-25 | Internal corrosive-resistant pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002188767A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6440788A (en) * | 1987-08-03 | 1989-02-13 | Sumitomo Metal Ind | Corrosionproof repair method of line pipe welded joint section |
| JPH03180124A (en) * | 1989-12-07 | 1991-08-06 | Mitsubishi Kasei Corp | Bag for fruit cultivation |
| JPH04107397A (en) * | 1990-08-23 | 1992-04-08 | Sekisui Chem Co Ltd | Specials and manufacture thereof |
| JPH0519778U (en) * | 1991-08-26 | 1993-03-12 | 積水化学工業株式会社 | Pipe fitting |
| JPH0639954A (en) * | 1992-07-22 | 1994-02-15 | Nippon Petrochem Co Ltd | Joint for pipe with foamed layer |
| JPH07217778A (en) * | 1994-02-07 | 1995-08-15 | Sekisui Chem Co Ltd | Corrosion resistant pipe joint |
| JPH08267638A (en) * | 1995-03-31 | 1996-10-15 | Toppan Printing Co Ltd | Packaging material provided with printing layer with excellent barrier property |
| WO1998030649A1 (en) * | 1997-01-14 | 1998-07-16 | Asahi Glass Company Ltd. | Adhesive for glass |
| JP2000173951A (en) * | 1998-12-02 | 2000-06-23 | Okura Ind Co Ltd | Base material film for dicing |
-
2000
- 2000-12-25 JP JP2000393106A patent/JP2002188767A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6440788A (en) * | 1987-08-03 | 1989-02-13 | Sumitomo Metal Ind | Corrosionproof repair method of line pipe welded joint section |
| JPH03180124A (en) * | 1989-12-07 | 1991-08-06 | Mitsubishi Kasei Corp | Bag for fruit cultivation |
| JPH04107397A (en) * | 1990-08-23 | 1992-04-08 | Sekisui Chem Co Ltd | Specials and manufacture thereof |
| JPH0519778U (en) * | 1991-08-26 | 1993-03-12 | 積水化学工業株式会社 | Pipe fitting |
| JPH0639954A (en) * | 1992-07-22 | 1994-02-15 | Nippon Petrochem Co Ltd | Joint for pipe with foamed layer |
| JPH07217778A (en) * | 1994-02-07 | 1995-08-15 | Sekisui Chem Co Ltd | Corrosion resistant pipe joint |
| JPH08267638A (en) * | 1995-03-31 | 1996-10-15 | Toppan Printing Co Ltd | Packaging material provided with printing layer with excellent barrier property |
| WO1998030649A1 (en) * | 1997-01-14 | 1998-07-16 | Asahi Glass Company Ltd. | Adhesive for glass |
| JP2000173951A (en) * | 1998-12-02 | 2000-06-23 | Okura Ind Co Ltd | Base material film for dicing |
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