JPS645811B2 - - Google Patents
Info
- Publication number
- JPS645811B2 JPS645811B2 JP16453082A JP16453082A JPS645811B2 JP S645811 B2 JPS645811 B2 JP S645811B2 JP 16453082 A JP16453082 A JP 16453082A JP 16453082 A JP16453082 A JP 16453082A JP S645811 B2 JPS645811 B2 JP S645811B2
- Authority
- JP
- Japan
- Prior art keywords
- self
- corrosion
- adhesive layer
- layer
- resistant cover
- 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.)
- Expired
Links
- 239000012790 adhesive layer Substances 0.000 claims description 21
- 230000007797 corrosion Effects 0.000 claims description 20
- 238000005260 corrosion Methods 0.000 claims description 20
- 239000010410 layer Substances 0.000 claims description 16
- 239000006260 foam Substances 0.000 claims description 14
- 229920001169 thermoplastic Polymers 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 229920002367 Polyisobutene Polymers 0.000 claims description 8
- 239000004416 thermosoftening plastic Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000002985 plastic film Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 229920005549 butyl rubber Polymers 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 1
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Landscapes
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
〔産業上の利用分野〕
この発明は防蝕カバーの製造方法に関する。
〔従来の技術〕
従来、地中埋設鋼管の継手部分の防蝕カバーと
して、例えば特開昭50−31423号公報、あるいは
実開昭49−75414号公報に記載のような防蝕カバ
ーが知られている。
これら防蝕カバーは管接続時に露出された管外
壁を簡単に被覆、防蝕でき、その防蝕信頼性も充
分に期待できるといつた利点を有する。
〔従来技術の問題点〕
しかしながら、上記防蝕カバーは、管外周に巻
き付け被覆して固定するため、カバー内面に自着
層を設けておくと非常に好都合であるが、かかる
防蝕カバーを成形するため、自着層を予め設けた
シートを用いて成形すると自着層が直接高圧を受
け層厚の均等性が乱されたり、内型表面に粘着す
るので、製造管理又は、離型手段が非常にやつか
いとなる問題が有つた。
また、上記自着層を防蝕カバー成形後に塗布形
成することも、防蝕カバーが複雑な内面形状を有
するため非常に困難となり、いずれにせよ、自着
層を内面に一体に有する防蝕カバーの成形は非常
に困難となる問題があつた。
〔発明が解決する問題点〕
この発明は、上記問題点に鑑み、自着層を内面
に有する防蝕カバーを簡単に製造し得る方法を提
供することを目的としてなされたものである。
〔問題点を解決する技術〕
即ち、この発明の防蝕カバーの製造方法は、熱
可塑性プラスチツクシートと独立気泡発泡体層と
を貼り合わせた支持体の独立気泡発泡体層表面に
ポリイソブチレン系高分子から成る自着層を少な
くとも厚さ0.10mm以上に塗布し、該自着層表面に
熱可塑性の剥離フイルムを仮着した後、これら積
層体を成形金型により、前記自着層を内面として
管接続部を包囲し得る、ヒンジ部で一体結合され
た半割型形状に成形することを特徴とするもので
ある。
〔作用〕
次に、この発明を説明する。
第１図はこの発明の方法の実施工程図、第２図
はこの発明の方法により製造された防蝕カバーの
要部拡大断面図、第３図は第２図の展開平面図、
第４図は防蝕カバーの使用状態説明図である。
この発明の防蝕カバーの製造方法は熱可塑性プ
ラスチツクシート１Ａと独立気泡発泡体層１Ｂと
を貼り合わせた支持体１の独立気泡発泡体層１Ｂ
の表面に耐水性、耐酸性、耐アルカリ性にすぐれ
たポリイソブチレン系高分子から成る自着層２を
少なくとも厚さ0.10mm以上に塗布形成し、この自
着層２表面に熱可塑性の剥離フイルム４を仮着
し、次いで、この剥離フイルム４を離型材とし
て、これら積層体を成形金型Ｂにより、前記自着
層２を内面として管接続部を包囲し得る、ヒンジ
部５で一体結合された半割型形状に形成するので
ある。
上記において、熱可塑性プラスチツクシート１
Ａは、その内層に形成される独立気泡発泡体層１
Ｂの保護殻体として機能するものであり、特に、
土中埋設管に使用する場合に保護体として機能す
る。又、プラスチツクシートを熱可塑性とするの
は成形の簡易性を実現するためである。
独立気泡発泡体層１Ｂは、接続すべき管外周に
複雑な凹凸があつても、これに隙間なくなじみ、
密着性を良くすると共に、発泡体層を通じ水分を
浸透させないようにするために設けられる。
又、自着層２として、ポリイソブチレン系高分
子体を使用するのは、前述のように、耐水性、耐
酸性、耐アルカリ性を有し、被着物に接着した
後、接着界面における種々の腐蝕原因物質の遮断
が実現されるからで、この効果の実現を確実にす
るため、少なくとも厚さ0.10mm以上とする必要が
ある。
尚、厚さ0.10mm以下であると、接着は可能であ
るが、水密性に欠けるおそれがある。
又、自着層２上に仮着される剥離フイルム４
は、自着層２の保護のほか、本発明品の製造を簡
易にするといつた機能を有し、材料を加熱し軟化
させ成形した場合、離型の際の離型材としても機
能するのである。従つて、この剥離フイルム４は
熱可塑性とすることが成形手段の都合上望まし
い。
そして、この発明の防蝕カバーは、目的とする
管接続部により種々変化されるが、一般に望まし
い構成としては、次のものがあげられる。
即ち、熱可塑性プラスチツクシート１Ａとして
は、ポリオレフイン系のプラスチツク、又、独立
気泡発泡体層１Ｂとしてはポリエチレン発泡体、
自着層２としてはブチルゴム（IIR）を主体と
し、これにポリイソブチレン低重合体を配量し、
適当量の粘着賦与剤を混合したものが望ましく、
厚さを0.2〜0.5mmに塗布形成したものが適当であ
る。又、熱可塑性剥離フイルム４はポリエチレン
フイルムが適当である。
なお、熱可塑性剥離フイルム４には図示のよう
に剥離を容易にするための把手３，３を一体成形
しておいても良い。
〔実施例〕
次にこの発明の実施例について説明する。
実施例 １
0.5mm厚さのポリエチレンシートにポリエチレ
ン独立気泡発泡体（20倍発泡）で10mm厚さの発泡
体層を熱融着により貼合わせて支持体とし、これ
にポリイソブチレン高分子100重量部、ポリイソ
ブチレン低分子30重量部、重炭酸カルシウム50重
量部、石油系樹脂25重量部を配合して成るポリイ
ソブチレン系自着層を0.3mmに塗布形成し、さら
にポリエチレンの熱可塑性プラスチツクフイルム
を貼合わせた後、熱成形により第２図、第３図に
示すような半割型の防蝕カバーを成形した。
実施例 ２
0.5mmの厚さのポリエチレンシートにブチルゴ
ムの独立気泡発泡体（10倍発泡）10mm厚のものを
熱融着により貼合わせ支持体とし、これに実施例
１と同様に自着層を形成し、剥離フイルムを貼合
わせ試験品を作成した。
次に第４図に示すように、でき上つた試験品の
剥離フイルムを剥がし、管接続部Ｂに被せて防蝕
施工し、従来のテープ巻工法の場合と比較した。
[Industrial Field of Application] This invention relates to a method of manufacturing a corrosion-resistant cover. [Prior Art] Corrosion-proof covers such as those described in Japanese Patent Application Laid-Open No. 50-31423 or Japanese Utility Model Application Publication No. 49-75414 are conventionally known as corrosion-proof covers for joints of underground steel pipes. . These corrosion-resistant covers have the advantage that they can easily cover and protect the outer walls of the pipes that are exposed when the pipes are connected, and that their corrosion-proof reliability can be fully expected. [Problems with the prior art] However, since the above-mentioned corrosion-resistant cover is wrapped and fixed around the outer circumference of the pipe, it is very convenient to provide a self-adhesive layer on the inner surface of the cover. When molding using a sheet with a self-adhesive layer provided in advance, the self-adhesive layer is directly subjected to high pressure, which disturbs the uniformity of the layer thickness and causes it to stick to the inner mold surface, making manufacturing control and mold release methods extremely difficult. I had a problem with my friend. Furthermore, it is extremely difficult to apply and form the self-adhesive layer after molding the corrosion-resistant cover because the corrosion-resistant cover has a complicated inner surface shape. A very difficult problem arose. [Problems to be Solved by the Invention] In view of the above-mentioned problems, the present invention has been made for the purpose of providing a method for easily manufacturing a corrosion-resistant cover having a self-adhesive layer on the inner surface. [Technology for Solving the Problems] That is, the method for producing a corrosion-resistant cover of the present invention involves applying a polyisobutylene polymer on the surface of the closed-cell foam layer of a support in which a thermoplastic plastic sheet and a closed-cell foam layer are bonded together. After applying a self-adhesive layer consisting of at least 0.10 mm thick and temporarily adhering a thermoplastic release film to the surface of the self-adhesive layer, the laminate is molded into a tube with the self-adhesive layer as the inner surface. It is characterized by being molded into a half-split shape integrally joined by a hinge part that can surround the connecting part. [Operation] Next, the present invention will be explained. FIG. 1 is an implementation process diagram of the method of the present invention, FIG. 2 is an enlarged sectional view of the main part of a corrosion-resistant cover manufactured by the method of the present invention, and FIG. 3 is a developed plan view of FIG.
FIG. 4 is an explanatory diagram of the usage state of the corrosion-resistant cover. The method for producing a corrosion-resistant cover of the present invention includes a closed-cell foam layer 1B of a support 1 in which a thermoplastic plastic sheet 1A and a closed-cell foam layer 1B are bonded together.
A self-adhesive layer 2 made of a polyisobutylene polymer with excellent water resistance, acid resistance, and alkali resistance is coated on the surface of the self-adhesive layer 2 to a thickness of at least 0.10 mm, and a thermoplastic release film 4 is applied to the surface of the self-adhesive layer 2. Then, using this release film 4 as a mold release material, these laminates were integrally joined by a mold B at a hinge part 5 that could surround the pipe connection part with the self-adhering layer 2 as the inner surface. It is formed into a half-split shape. In the above, thermoplastic sheet 1
A is a closed-cell foam layer 1 formed in its inner layer.
It functions as a protective shell for B, and in particular,
Functions as a protector when used for underground pipes. Furthermore, the reason why the plastic sheet is made of thermoplastic material is to realize easy molding. The closed cell foam layer 1B conforms to the complicated irregularities on the outer periphery of the pipe to be connected without any gaps.
It is provided to improve adhesion and to prevent moisture from penetrating through the foam layer. In addition, the use of polyisobutylene polymer as the self-adhesive layer 2 has water resistance, acid resistance, and alkali resistance, as described above, and after adhering to the adherend, it is resistant to various types of corrosion at the adhesion interface. This is because it achieves blocking of causative substances, and in order to ensure that this effect is realized, it is necessary to have a thickness of at least 0.10 mm or more. In addition, if the thickness is 0.10 mm or less, adhesion is possible, but watertightness may be lacking. Further, a release film 4 temporarily attached on the self-adhesive layer 2
In addition to protecting the self-adhesive layer 2, it has the function of simplifying the production of the product of the present invention, and also functions as a mold release agent when releasing the mold when the material is heated and softened and molded. . Therefore, it is desirable that the release film 4 be made of thermoplastic material for convenience of molding means. The corrosion-resistant cover of the present invention may vary depending on the intended pipe connection part, but generally preferred configurations include the following. That is, the thermoplastic sheet 1A is made of polyolefin plastic, and the closed cell foam layer 1B is made of polyethylene foam.
The self-adhesive layer 2 is mainly made of butyl rubber (IIR), to which polyisobutylene low polymer is added,
It is preferable to mix an appropriate amount of tackifying agent.
A coating with a thickness of 0.2 to 0.5 mm is suitable. Further, the thermoplastic release film 4 is suitably a polyethylene film. Note that the thermoplastic release film 4 may be integrally molded with handles 3, 3 for facilitating release as shown in the figure. [Example] Next, an example of the present invention will be described. Example 1 A 10 mm thick foam layer of polyethylene closed cell foam (20 times foamed) was bonded to a 0.5 mm thick polyethylene sheet by heat fusion to form a support, and 100 parts by weight of polyisobutylene polymer was added to this. A polyisobutylene self-adhesive layer consisting of 30 parts by weight of low molecular weight polyisobutylene, 50 parts by weight of calcium bicarbonate, and 25 parts by weight of petroleum resin was applied and formed to a thickness of 0.3 mm, and a thermoplastic film of polyethylene was further pasted. After combining them, a half-split corrosion-resistant cover as shown in FIGS. 2 and 3 was formed by thermoforming. Example 2 A 10 mm thick butyl rubber closed cell foam (10 times foamed) was bonded to a 0.5 mm thick polyethylene sheet by heat fusion to form a support, and a self-adhesive layer was applied to this in the same manner as in Example 1. A test product was prepared by laminating a release film. Next, as shown in FIG. 4, the release film of the completed test product was peeled off and placed over the pipe connection part B for corrosion protection, and compared with the conventional tape wrapping method.
この発明は以上説明したように、自着層を予め
有したシートであつても、該自着層を損傷したり
あるいは金型を汚すことなくスムーズに複雑な内
面形状を有した防蝕カバーが成形でき、しかも、
防蝕カバーを構成する各層も、成形前に一体的に
積層されているので層間剥離を生じるおそれも少
なく、耐衝撃性、水密性に優れた防蝕カバーが簡
単に成形可能となるのである。
As explained above, the present invention allows a corrosion-resistant cover with a complex inner shape to be molded smoothly without damaging the self-adhesive layer or staining the mold, even if the sheet already has a self-adhesive layer. It is possible, and
Since each layer constituting the corrosion-resistant cover is integrally laminated before molding, there is little risk of delamination, and a corrosion-resistant cover with excellent impact resistance and watertightness can be easily molded.
第１図はこの発明の方法を示す説明図、第２図
はこの発明の方法により製造した防蝕カバーの側
面図、第３図は第２図の展開平面図、第４図は防
蝕カバーの使用状態説明図である。
Figure 1 is an explanatory diagram showing the method of the present invention, Figure 2 is a side view of a corrosion-resistant cover manufactured by the method of the present invention, Figure 3 is a developed plan view of Figure 2, and Figure 4 is the use of the corrosion-resistant cover. It is a state explanatory diagram.
Claims (1)
体層とを貼り合わせた支持体の独立気泡発泡体層
表面にポリイソブチレン系高分子から成る自着層
を少なくとも厚さ0.10mm以上に塗布し、該自着層
表面に熱可塑性の剥離フイルムを仮着した後、こ
れら積層体を成形金型により、前記自着層を内面
として管接続部を包囲し得る、ヒンジ部で一体結
合された半割型形状に成形することを特徴とする
防蝕カバーの製造方法。1. A self-adhesive layer made of a polyisobutylene polymer is applied to a thickness of at least 0.10 mm on the surface of the closed-cell foam layer of a support in which a thermoplastic plastic sheet and a closed-cell foam layer are bonded together. After temporarily adhering a thermoplastic release film to the surface of the layer, the laminate is molded into a half-split shape integrally joined at a hinge part, which can surround the pipe connection part with the self-adhesive layer as the inner surface. A method for manufacturing a corrosion-resistant cover, which is characterized by molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16453082A JPS5954892A (en) | 1982-09-20 | 1982-09-20 | Corrosion protective cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16453082A JPS5954892A (en) | 1982-09-20 | 1982-09-20 | Corrosion protective cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5954892A JPS5954892A (en) | 1984-03-29 |
| JPS645811B2 true JPS645811B2 (en) | 1989-02-01 |
Family
ID=15794913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16453082A Granted JPS5954892A (en) | 1982-09-20 | 1982-09-20 | Corrosion protective cover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5954892A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6271498U (en) * | 1985-10-24 | 1987-05-07 | ||
| JPH0313035Y2 (en) * | 1985-10-24 | 1991-03-26 | ||
| JPS62184290U (en) * | 1986-05-16 | 1987-11-24 | ||
| JPS62184287U (en) * | 1986-05-16 | 1987-11-24 | ||
| JPH01121798U (en) * | 1988-02-10 | 1989-08-17 | ||
| JPH01146093U (en) * | 1988-03-30 | 1989-10-06 | ||
| JPH03144194A (en) * | 1990-09-19 | 1991-06-19 | Osaka Gas Co Ltd | Execution method for corrosion resistant cover for pipe joint |
-
1982
- 1982-09-20 JP JP16453082A patent/JPS5954892A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5954892A (en) | 1984-03-29 |
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