JPH0811206B2 - Tubular anticorrosion spray coating method - Google Patents
Tubular anticorrosion spray coating methodInfo
- Publication number
- JPH0811206B2 JPH0811206B2 JP3137793A JP13779391A JPH0811206B2 JP H0811206 B2 JPH0811206 B2 JP H0811206B2 JP 3137793 A JP3137793 A JP 3137793A JP 13779391 A JP13779391 A JP 13779391A JP H0811206 B2 JPH0811206 B2 JP H0811206B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- spray gun
- tubular body
- primer
- thermoplastic resin
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C7/00—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
Description
【０００１】[0001]
【産業上の利用分野】本発明は鋼管等の管体の内面又は
外面にプラスチックの防食被覆を溶射によって施す管体
防食溶射被覆方法及び装置に関するものである。上下水
道管、原子力・火力発電所の海水取排水管、石油ガスの
輸送管等には、流体による管体内面の腐食を防止するた
めに、内面にポリエチレン等のプラスチックを被覆した
鋼管が用いられる。また、土中埋設や海中敷設されるパ
イプラインでは管体外面の腐食を防止するために、外面
に内面と同様の被覆を施した鋼管が用いられる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion thermal spray coating method and apparatus for a pipe such as a steel pipe, in which an inner surface or an outer surface of a tubular body is provided with a plastic anticorrosion coating by thermal spraying. Steel pipes coated with polyethylene or other plastic on the inside are used for water and sewage pipes, seawater intake and drainage pipes for nuclear power plants, oil gas transport pipes, etc. to prevent corrosion of the inner surface of the pipe by fluid. . Further, in a pipeline buried in the soil or laid in the sea, a steel pipe having an outer surface coated with the same coating as the inner surface is used in order to prevent corrosion of the outer surface of the pipe body.
【０００２】[0002]
【従来の技術】従来より管体の内外面にプラスチックの
防食被覆を施す方法として知られているものに以下のも
のがある。まず、管体を予め加熱しておき、溶融したポ
リエチレン等のプラスチックを管体外面に押出被覆する
方法がある。次に、管体を予め加熱しておき、ポリエチ
レン等のプラスチック粉体を流動させた槽内に加熱した
管体を浸漬させて管体外面にプラスチックを融着させる
方法が特公昭４３−１２６６６号公報に開示されてい
る。更に、管体を予め加熱しておき、ポリエチレン等の
プラスチック粉体を管体内面に散布、充填或いは吹き付
けてして管体内面に融着させる方法が特公昭３８−１５
０８０号公報、特公昭４０−１５９７７号公報、特公昭
４０−１５９７８号公報及び特公平２−２６２４号公報
に開示されている。2. Description of the Related Art Conventionally, the following methods have been known as a method for applying an anticorrosive coating of plastic on the inner and outer surfaces of a tubular body. First, there is a method in which the tubular body is heated in advance and the melted plastic such as polyethylene is extrusion-coated on the outer surface of the tubular body. Next, a method in which the tubular body is preheated and the heated tubular body is immersed in a tank in which plastic powder such as polyethylene is flown to fuse the plastic to the outer surface of the tubular body is disclosed in Japanese Examined Patent Publication No. 43-12666. It is disclosed in the official gazette. Further, there is a method in which the tubular body is preheated, and a plastic powder such as polyethylene is sprayed, filled or sprayed on the inner surface of the tubular body so as to be fused to the inner surface of the tubular body.
It is disclosed in Japanese Patent Publication No. 080, Japanese Patent Publication No. 40-15977, Japanese Patent Publication No. 40-15978, and Japanese Patent Publication No. 2-2624.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の管体の
内外面にプラスチックの防食被覆を施す方法ではいずれ
も管体をプラスチックの融点以上に加熱しておき、融着
させる方法であるため、管体を加熱するための誘導加熱
等の加熱装置が不可欠である。従って、加熱装置を設備
することが必要なために被覆できる管体の外径及び長さ
寸法が制約されて大径の管体には適用され難く、管体の
敷設後には、部分的に被覆することが困難であるという
問題点があった。また、管体の加熱を行なうために加熱
時間が必要であって防食被覆に要する時間が長くなると
共に加熱装置が必要であることによって防食被覆のコス
トが高くなるという問題点もあった。更に、管体を均一
に加熱しないと防食被覆の品質が劣り易くなるために管
体を均一に加熱しようとするために加熱装置のコスト高
を招くという問題や、管の内外面に異った防食被覆を施
す場合には管体が加熱することによって先に被覆した皮
膜が劣化しないようにするために工程や材料が制約され
るという問題点も生じるものである。In any of the above-mentioned conventional methods for applying the anticorrosive coating of plastic to the inner and outer surfaces of the tubular body, the method is to heat the tubular body to a temperature above the melting point of the plastic and fuse it. A heating device such as induction heating for heating the tube is essential. Therefore, since it is necessary to install a heating device, the outer diameter and length of the pipe that can be covered are limited, and it is difficult to apply it to a large-diameter pipe. There was a problem that it was difficult to do. Further, there is a problem that heating time is required for heating the tubular body, the time required for the anticorrosion coating is long, and the cost of the anticorrosion coating is increased due to the necessity of the heating device. Furthermore, if the tube body is not heated uniformly, the quality of the anticorrosion coating tends to deteriorate, so that the heating device costs higher because the tube body is heated uniformly, and the inner and outer surfaces of the tube are different. In the case of applying the anticorrosion coating, there is a problem that the process and materials are restricted so that the coating film previously coated is not deteriorated by heating the tube.
【０００４】本発明はかかる問題点を解決するためにな
されたもので、管体の予加熱を不要とし、大径の管体に
対しても防食被覆が行え、現地や敷設後にも施工でき、
防食被覆の品質が向上し、コストが低減できる管体防食
溶射被覆方法を提供することを目的とするものである。The present invention has been made in order to solve the above-mentioned problems, does not require preheating of the tubular body, can perform anticorrosion coating even on a large-diameter tubular body, and can be installed on site or after installation,
It is an object of the present invention to provide a tubular body anticorrosion spray coating method capable of improving the quality of the anticorrosion coating and reducing the cost.
【０００５】[0005]
【課題を解決するための手段】本発明に係る管体防食溶
射被覆方法は、管体と溶射される熱可塑性樹脂粉体の双
方に接着性を有し、溶射時に熱劣化しない変性ポリアミ
ドアミン硬化型エポキシ樹脂、又はポリクロロプレーン
フェノール樹脂の合成樹脂プライマを管体の内面又は外
面に塗布してプライマ層を形成する工程と、合成樹脂プ
ライマが塗布された管体を室温の状態で少なくとも３０
分、多くとも１２０時間経過させて自然乾燥させ、前記
プライマ層を硬化させる工程と、前記乾燥時間が経過
し、プライマ皮膜が表面乾燥した後、完全硬化するまで
の間に、管体に形成されたプライマ層上に管体を予熱し
ないで、溶射ガンから吐出した混合ガスの燃焼火炎によ
り同じく溶射ガンから吐出したポリエチレン、ポリプロ
ピレン又はエチレン酢酸ビニル共重合体の熱可塑性樹脂
粉体を加熱溶融させ、液滴状の熱可塑性樹脂粉体を管体
の内面又は外面に吹付け、付着させてなる熱可塑性樹脂
粉体の溶射を行い、溶射ガンを管体に対して回転させる
か、或いは溶射ガンを管体に近接させた状態で管体を回
転させ、それと共に溶射ガンを管体の軸方向に移動させ
ることにより、管体の内面又は外面に所望膜厚のプラス
チックの防食被膜を形成する工程とを備えてなるもので
ある。SUMMARY OF THE INVENTION A method for corrosion protection spray coating of a tubular body according to the present invention is a modified polyamidoamine cure which has adhesiveness to both the tubular body and the thermoplastic resin powder to be sprayed and does not deteriorate by heat during thermal spraying. Type epoxy resin or polychloroprene phenolic resin synthetic resin primer is applied to the inner or outer surface of the tube to form a primer layer, and the tube coated with the synthetic resin primer is kept at room temperature for at least 30%.
Minutes, at most 120 hours, to naturally dry to cure the primer layer, and after the drying time has elapsed, the primer film is formed on the tubular body until the primer film is completely cured after surface drying. Without preheating the tube on the primer layer, heat and melt the thermoplastic resin powder of polyethylene, polypropylene or ethylene vinyl acetate copolymer also discharged from the spray gun by the combustion flame of the mixed gas discharged from the spray gun, The thermoplastic resin powder in the form of liquid droplets is sprayed onto the inner surface or the outer surface of the pipe to spray the thermoplastic resin powder, and the spray gun is rotated with respect to the pipe, or the spray gun is used. By rotating the pipe in the state of being close to the pipe and moving the thermal spray gun in the axial direction of the pipe at the same time, a plastic anticorrosion coating of the desired thickness is formed on the inner or outer surface of the pipe. It is made of a step for forming.
【０００６】[0006]
【作用】本発明においては、管体と溶射される熱可塑性
樹脂粉体の双方に接着性を有し、溶射時に熱劣化しない
変性ポリアミドアミン硬化型エポキシ樹脂、又はポリク
ロロプレーンフェノール樹脂の合成樹脂プライマを管体
の内面又は外面に塗布してプライマ層を形成する工程
と、合成樹脂プライマが塗布された管体を室温の状態で
少なくとも３０分、多くとも１２０時間経過させて自然
乾燥させ、前記プライマ層を硬化させる工程と、前記乾
燥時間が経過し、プライマ皮膜が表面乾燥した後、完全
硬化するまでの間に、管体に形成されたプライマ層上に
管体を予熱しないで、溶射ガンから吐出した混合ガスの
燃焼火炎により同じく溶射ガンから吐出したポリエチレ
ン、ポリプロピレン又はエチレン酢酸ビニル共重合体の
熱可塑性樹脂粉体を加熱溶融させ、液滴状の熱可塑性樹
脂粉体を管体の内面又は外面に吹付け、付着させてなる
熱可塑性樹脂粉体の溶射を行い、溶射ガンを管体に対し
て回転させるか、或いは溶射ガンを管体に近接させた状
態で管体を回転させ、それと共に溶射ガンを管体の軸方
向に移動させることにより、管体の内面又は外面に所望
膜厚のプラスチックの防食被膜を形成する工程とによ
り、管体の内面又は外面にプラスチックの防食被膜を形
成するようにしているから、従来のように加熱装置によ
る管体の加熱を不要とし、大径の管体に対しても防食被
覆が行える。また、溶射による熱可塑性樹脂の防食被覆
を行う前に管体と熱可塑性樹脂粉体の双方に接着性のあ
る合成樹脂プライマを管体の内面又は外面に塗布してい
るから、溶射による火炎によって溶融された熱可塑性樹
脂粉体の溶融皮膜が管体に容易かつ強固に密着させら
れ、その溶融皮膜が冷却されて固化するときに剥離やク
ラックの発生の欠陥が防止される。In the present invention, a modified polyamidoamine-curable epoxy resin or a synthetic resin of polychloroprene phenol resin which has adhesiveness to both the tubular body and the thermoplastic resin powder to be sprayed and does not deteriorate by heat during spraying. A step of applying a primer to the inner surface or the outer surface of the tubular body to form a primer layer; and allowing the tubular body coated with the synthetic resin primer to naturally dry at room temperature for at least 30 minutes and at most 120 hours. The step of curing the primer layer and the thermal spray gun without preheating the tube on the primer layer formed on the tube after the drying time elapses and after the primer coating is completely dried on the surface The thermoplastic resin powder of polyethylene, polypropylene or ethylene vinyl acetate copolymer, which was also discharged from the spray gun by the combustion flame of the mixed gas discharged from Thermally melting, spraying a droplet-shaped thermoplastic resin powder onto the inner surface or outer surface of the pipe body, spraying the thermoplastic resin powder adhered, and rotating the spray gun with respect to the pipe body, Alternatively, by rotating the pipe in a state where the spray gun is close to the pipe and moving the spray gun in the axial direction of the pipe at the same time, an anticorrosive coating of a desired thickness of plastic is formed on the inner surface or the outer surface of the pipe. By the process of forming, the anticorrosive coating of plastic is formed on the inner surface or outer surface of the tubular body, so heating of the tubular body by a heating device is not required as in the conventional case, and even for large-diameter tubular bodies. Can perform anticorrosion coating. Also, before applying the anticorrosion coating of the thermoplastic resin by thermal spraying, the synthetic resin primer having adhesiveness to both the tubular body and the thermoplastic resin powder is applied to the inner surface or the outer surface of the tubular body. The molten coating of the molten thermoplastic resin powder is easily and firmly adhered to the tube body, and when the molten coating is cooled and solidified, defects such as peeling and cracking are prevented.
【０００７】[0007]
【実施例】図１は本発明方法が実施される装置の概略を
示す構成図、図２は同装置の概略を示す断面図である。
図において、１は鋼管等の管体、２は管体１の内面に塗
布された合成樹脂プライマのプライマ層、３はプライマ
層２上に施されたプラスチック防食被覆、４は管体１の
各端部を回転支承する四つのローラ４ａを有する管体支
承台、５は管体支承台４の一つのローラ４ａを回転駆動
するモータ、６は管体回転装置で、二つの管体支承台４
と１つのモータ５とで構成されている。７は熱可塑性樹
脂粉体を溶射する溶射ガン、８は溶射ガン７を先端に備
えたガン水平支持アーム、９はガン水平支持アーム８を
支持すると共に水平方向に移動させる溶射ガン駆動装
置、１０は溶射ガン７にパイプ１１を介して熱可塑性樹
脂粉体及び酸素と燃料の混合ガスを供給する溶射材供給
装置、１２は溶射材供給装置１０に酸素を送り込むコン
プレッサ、１３は溶射材供給装置１０に例えばプロパン
ガス等の燃料ガスを送り込む燃料ガスボンベである。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the outline of an apparatus for carrying out the method of the present invention, and FIG. 2 is a sectional view showing the outline of the apparatus.
In the figure, 1 is a tubular body such as a steel pipe, 2 is a primer layer of a synthetic resin primer applied to the inner surface of the tubular body 3, 3 is a plastic anticorrosive coating applied on the primer layer 2, and 4 is each of the tubular body 1. A tubular body support base having four rollers 4a for rotationally supporting the ends, 5 is a motor for rotationally driving one roller 4a of the tubular body support base 4, 6 is a tubular body rotation device, and two tubular body support bases 4 are provided.
And one motor 5. Reference numeral 7 is a spray gun for spraying thermoplastic resin powder, 8 is a gun horizontal support arm having the spray gun 7 at its tip, 9 is a spray gun driving device for supporting the gun horizontal support arm 8 and moving it horizontally. Is a spray material supplying device for supplying the thermoplastic resin powder and a mixed gas of oxygen and fuel to the spray gun 7 through a pipe 11, 12 is a compressor for sending oxygen to the spray material supplying device 10, and 13 is a spray material supplying device 10 It is a fuel gas cylinder for feeding a fuel gas such as propane gas into.
【０００８】次に、図１に示す装置を用いて本発明方法
を実施した場合について説明する。まず、管体回転装置
６に回転可能に支承されている直径２ｍの鋼管である管
体１の内面に変性ポリアミドアミン硬化型エポキシ樹脂
系の合成樹脂プライマを塗布する。この合成樹脂プライ
マは管体１と防食被覆樹脂の双方に良好な接着性を有
し、溶射時の温度上昇により熱劣化しないものが条件と
される。かかる合成樹脂プライマの塗布はスプレーや刷
毛、ローラ等の塗装具を用いて行い、その塗布条件はプ
ラスチック溶射皮膜との密着性を最適にするためと溶射
皮膜の品質を最適にするために、塗布量を１００〜３０
０ｇ／ｍ2 、乾燥膜厚５０〜１５０μｍの範囲とする。
なお、合成樹脂プライマを塗布した後、次に行われるプ
ラスチック溶射を施すまでの間隔は、合成樹脂プライマ
が乾燥するまでの時間からプライマと溶射皮膜の密着性
を最適にする時間までの範囲が望ましく、例えば環境温
度が２０℃程度の場合には３０分から４８時間の範囲と
する。また、合成樹脂プライマにポリクロロプレーンフ
ェノール樹脂系のものを用いたときには３０分から１２
０時間の範囲が望ましい。Next, the case where the method of the present invention is carried out by using the apparatus shown in FIG. 1 will be described. First, a modified polyamidoamine-curable epoxy resin-based synthetic resin primer is applied to the inner surface of the tube body 1 which is a steel tube having a diameter of 2 m rotatably supported by the tube body rotation device 6. This synthetic resin primer is required to have good adhesiveness to both the tubular body 1 and the anticorrosion coating resin and not be thermally deteriorated due to a temperature rise during thermal spraying. The application of such synthetic resin primer is carried out by using a coating tool such as a spray, a brush or a roller, and the application conditions are for the purpose of optimizing the adhesion with the plastic spray coating and the quality of the spray coating. 100 to 30
The range is 0 g / m 2 and the dry film thickness is 50 to 150 μm.
The interval between the application of the synthetic resin primer and the subsequent plastic spraying is preferably in the range from the time until the synthetic resin primer dries to the time when the adhesion between the primer and the sprayed coating is optimized. For example, when the environmental temperature is about 20 ° C., the range is from 30 minutes to 48 hours. When a synthetic resin primer of polychloroprene phenol resin type is used, it takes 30 minutes to 12 minutes.
A range of 0 hours is desirable.
【０００９】次に、管体１の内面に熱可塑性樹脂粉体を
溶射して管体１の内面にプラスチック防食被覆を形成す
るが、それには管体回転装置６を駆動させて管体１を回
転させながら、管体１の内面側に配置させられている溶
射ガン７を溶射ガン駆動装置９によってガン水平支持ア
ーム８を水平方向に駆動させて、管体１の内面と平行に
管軸方向に移動させる。そして、かかる移動中に溶射ガ
ン７から溶射材供給装置１０から供給された熱可塑性樹
脂であるポリエチレン粉体を酸素とプロパンガスの混合
ガスの火炎によって溶融して溶射し、ポリエチレン防食
被覆を管体１の内面に連続的に形成させる。尚、このと
き図示しないがガン水平支持アーム８に２つの溶射ガン
７が設けられており、熱可塑性樹脂粉体であるポリエチ
レン粉体の粒径は２５０μｍ以下のものを使用してい
る。そして、管体１の回転速度が２ｒｐｍ、溶射ガン７
の移動速度が６０mm／min ，溶射ガン７からの粉体吐出
量が２００ｇ／min （溶射ガン１基につき）で、膜厚１
mmのポリエチレン防食被覆が１時間当り、１８ｍ2 の効
率で得られた。Next, a thermoplastic resin powder is sprayed on the inner surface of the tube body 1 to form a plastic anticorrosion coating on the inner surface of the tube body 1, and the tube body rotating device 6 is driven to fix the tube body 1 thereon. While rotating, the gun horizontal support arm 8 is horizontally driven by the spray gun driving device 9 to move the spray gun 7 arranged on the inner surface side of the tube body 1 in the tube axial direction in parallel with the inner surface of the tube body 1. Move to. Then, during such movement, polyethylene powder, which is a thermoplastic resin supplied from the thermal spray material supply device 10 from the thermal spray gun 7, is melted and sprayed by a flame of a mixed gas of oxygen and propane gas, and a polyethylene anticorrosive coating is formed on the tubular body. It is formed continuously on the inner surface of 1. At this time, although not shown, two spray guns 7 are provided on the gun horizontal support arm 8, and the polyethylene powder, which is a thermoplastic resin powder, has a particle size of 250 μm or less. The rotational speed of the tube body 1 is 2 rpm, and the spray gun 7
At a moving speed of 60 mm / min, a discharge rate of powder from the spray gun 7 of 200 g / min (per spray gun), and a film thickness of 1
A polyethylene anticorrosion coating of mm was obtained with an efficiency of 18 m 2 per hour.
【００１０】上記実施例では管体１の内面に合成樹脂プ
ライマを塗布した後、管体回転装置６によって管体１を
回転させながら、管体１の内面側に配置された溶射ガン
７を溶射ガン駆動装置９によって管体１の内面と管軸方
向に移動させて溶射ガン７からポリエチレン粉体を溶射
し、ポリエチレン防食被覆を管体１の内面に連続的に形
成されるようにしているから、管体１を従来のように加
熱装置によって加熱をしないために大径の管体に対して
プラスチック防食被覆を施すことができ、管体１の長さ
寸法の制約もなくなり、防食被覆のコストが低減できる
と共に品質が向上する。また、予め管体１を加熱してお
かないことによって、先に、管体１の外面に被覆した皮
膜を劣化しないようにする防食施工工程や材料の制約も
なくなった。なお、この実施例ではプラスチック防食被
覆の材料としてポリエチレン粉体を用いているが、ポリ
プロピレン，ナイロン，エチレン−酢酸ビニル共重合体
等の熱可塑性樹脂粉体であればよいことは勿論である。In the above embodiment, after the synthetic resin primer is applied to the inner surface of the tubular body 1, the thermal spray gun 7 disposed on the inner surface side of the tubular body 1 is sprayed while the tubular body 1 is rotated by the tubular body rotating device 6. Since the gun driving device 9 moves the inner surface of the tube 1 in the tube axial direction to spray the polyethylene powder from the spray gun 7, the polyethylene anticorrosion coating is continuously formed on the inner surface of the tube 1. Since the tube 1 is not heated by a heating device as in the conventional case, a plastic anticorrosion coating can be applied to a large-diameter tube, the length of the tube 1 is not restricted, and the cost of anticorrosion coating can be reduced. Can be reduced and the quality can be improved. Further, by not heating the tubular body 1 in advance, there is no restriction on the anticorrosion construction process and the material that prevent the coating of the outer surface of the tubular body 1 from being deteriorated. Although polyethylene powder is used as the material for the anticorrosion coating of plastic in this embodiment, it is needless to say that it may be thermoplastic resin powder such as polypropylene, nylon, ethylene-vinyl acetate copolymer and the like.
【００１１】更に、上記実施例では溶射ガン７を管体１
の内面側に配置して管体１の内面にプラスチック防食被
覆を施すようにしているが、溶射ガン７を管体の外面側
に配置して管体１の外面にプラスチック防止食被覆を施
すことができることはいうまでもない。また、管体１の
内面にプラスチック防食皮膜を連続的に形成するため
に、管体１を管体回転装置６によって回転させながら、
溶射ガン７を溶射ガン駆動装置９によって管体１の内面
と管軸方向に移動させているが、溶射ガン７を固定と
し、管体１を回転させると共に管体を管軸方向に移動さ
せる移動装置を用いることによっても管体１の内面にプ
ラスチック防食被覆を連続的に形成することができる。Further, in the above embodiment, the spray gun 7 is connected to the tube body 1.
The inner surface of the tube body 1 is coated with a plastic anticorrosion coating, but the thermal spray gun 7 is arranged on the outer surface side of the tube body to apply a plastic anticorrosion coating to the outer surface of the tube body 1. It goes without saying that you can do it. Further, in order to continuously form the plastic anticorrosive film on the inner surface of the pipe body 1, while rotating the pipe body 1 by the pipe body rotating device 6,
Although the thermal spray gun 7 is moved in the axial direction with the inner surface of the tubular body 1 by the thermal spray gun drive device 9, the thermal spray gun 7 is fixed and the tubular body 1 is rotated and the tubular body is moved in the axial direction. The plastic anticorrosion coating can be continuously formed on the inner surface of the tubular body 1 by using the apparatus.
【００１２】図３は本発明方法が実施される別の装置の
概略を示す構成図である。図において、図１に示す実施
例と同一の構成は同一符号を付して重複した構成の説明
を省略する。１４は管体１の内面に近接させた状態で溶
射ガン７を管周方向に回転させる溶射ガン回転装置で、
駆動源と回転機構とを内蔵している。１５は溶射ガン回
転装置１４を搭載して管体１の内面上を管軸方向に走行
する溶射ガン走行装置で、内蔵する駆動源によって走行
する。１５ａは溶射ガン走行装置１５の走行輪である。FIG. 3 is a block diagram showing the outline of another apparatus for carrying out the method of the present invention. In the figure, the same configurations as those of the embodiment shown in FIG. Reference numeral 14 is a spray gun rotating device for rotating the spray gun 7 in the pipe circumferential direction in a state of being brought close to the inner surface of the pipe body 1,
It has a built-in drive source and rotation mechanism. Reference numeral 15 denotes a thermal spray gun traveling device which mounts the thermal spray gun rotating device 14 and travels on the inner surface of the tubular body 1 in the axial direction of the tubular body. Reference numeral 15a is a traveling wheel of the spray gun traveling device 15.
【００１３】次に、図３に示す装置を用いて本発明方法
を実施した場合について説明する。まず、直径２ｍの鋼
管である管体１の内面に変性ポリアミドアミン硬化型エ
ポキシ樹脂系の合成樹脂プライマを塗布する。合成樹脂
プライマの塗布条件は図１に示す実施例の装置を用いて
本発明を実施した場合と同様である。次に、管体１の内
面に熱可塑性樹脂粉体を溶射して管体１の内面にプラス
チック防食被覆を形成するが、それには溶射ガン７を溶
射ガン回転装置１４により管体１の内面に近接して管周
方向に移動させ、かつ溶射ガン走行装置１５により管体
１の内面と平行に管軸方向に移動させる。そして、かか
る移動中に溶射ガン７から溶射材供給装置１０から供給
されたポリエチレン粉体を酸素とプロパンガスり混合ガ
スの火炎によって溶融して溶射し、ポリエチレン防被覆
を管体１の内面に連続的に形成させる。Next, the case where the method of the present invention is carried out using the apparatus shown in FIG. 3 will be described. First, a modified polyamidoamine-curable epoxy resin-based synthetic resin primer is applied to the inner surface of the tubular body 1 which is a steel pipe having a diameter of 2 m. The conditions for applying the synthetic resin primer are the same as in the case of carrying out the present invention using the apparatus of the embodiment shown in FIG. Next, a thermoplastic resin powder is sprayed on the inner surface of the tube body 1 to form a plastic anticorrosion coating on the inner surface of the tube body 1. The spray gun 7 is formed on the inner surface of the tube body 1 by the spray gun rotating device 14. The pipes are moved close to each other in the pipe circumferential direction, and are moved in the pipe axial direction in parallel with the inner surface of the pipe body 1 by the spray gun traveling device 15. Then, during such movement, the polyethylene powder supplied from the thermal spray material supply device 10 from the thermal spray gun 7 is melted and sprayed by the flame of a mixed gas of oxygen and propane gas, and the polyethylene protective coating is continuously applied to the inner surface of the tubular body 1. Form.
【００１４】このときの熱可塑性樹脂粉体であるポリエ
チレン粉体の粒径は２５０μｍ以下のものを使用してい
る。そして、溶射ガン７の回転速度が２ｒｐｍ、溶射ガ
ン７の移動速度が３０mm／min 、溶射ガン７からの粉体
吐出量が２００ｇ／min で、膜厚１mmのポレエチレン防
食被覆が１時間当り９ｍ2 の効率で得られた。この実施
例では管体１の内面に合成樹脂プライマを塗布した後、
溶射ガン回転装置１４によって管周方向に回転させなが
ら溶射ガン走行装置１５によって管体１の内面と平行に
移動させ、溶射ガン７からポリエチレン粉体を溶射し、
ポリエチレン防食被覆を管体１の内面に連続的に形成さ
れるようにしているから、管体１の寸法の制約がなくな
り、防食被覆のコストが低減できると共に品質が向上
し、防食施工工程や材料の制約もなくなるだけでなく。
管体１の内部を溶射ガン７が回転しながら移動するため
に現地での施工や敷設後の施工も可能としている。な
お、この実施例ではプラスチック防食被覆の材料として
ポリエチレン粉体を用いているが、前記実施例と同様熱
可塑性樹脂粉体であればよく、また合成樹脂プライマも
変性ポリアミドアミン硬化型エポキシ樹脂系のもの以外
にポリクロロプレーンフェノール樹脂系のものを用いて
もよいことは勿論である。At this time, the polyethylene powder which is the thermoplastic resin powder has a particle size of 250 μm or less. The rotation speed of the spray gun 7 was 2 rpm, the moving speed of the spray gun 7 was 30 mm / min, the amount of powder discharged from the spray gun 7 was 200 g / min, and the polyethylene anticorrosion coating with a thickness of 1 mm was 9 m 2 per hour. It was obtained with the efficiency of. In this embodiment, after applying a synthetic resin primer to the inner surface of the tubular body 1,
While rotating the spray gun rotating device 14 in the circumferential direction of the pipe, the spray gun traveling device 15 moves the pipe parallel to the inner surface of the pipe 1 to spray polyethylene powder from the spray gun 7.
Since the polyethylene anticorrosion coating is formed continuously on the inner surface of the pipe body 1, there are no restrictions on the dimensions of the pipe body 1, the cost of the anticorrosion coating can be reduced, and the quality can be improved. Not only is the restriction of no.
Since the spray gun 7 moves inside the tube body 1 while rotating, it can be installed locally or after installation. In this embodiment, polyethylene powder is used as the material for the plastic anticorrosion coating, but any thermoplastic resin powder may be used as in the above embodiment, and the synthetic resin primer is also a modified polyamidoamine-curable epoxy resin type. Needless to say, a polychloroprene phenolic resin-based material may be used instead of the above-mentioned materials.
【００１５】[0015]
【発明の効果】本発明においては、管体と溶射される熱
可塑性樹脂粉体の双方に接着性を有し、溶射時に熱劣化
しない変性ポリアミドアミン硬化型エポキシ樹脂、又は
ポリクロロプレーンフェノール樹脂の合成樹脂プライマ
を管体の内面又は外面に塗布してプライマ層を形成する
工程と、合成樹脂プライマが塗布された管体を室温の状
態で少なくとも３０分、多くとも１２０時間経過させて
自然乾燥させ、前記プライマ層を硬化させる工程と、前
記乾燥時間が経過し、プライマ皮膜が表面乾燥した後、
完全硬化するまでの間に、管体に形成されたプライマ層
上に管体を予熱しないで、溶射ガンから吐出した混合ガ
スの燃焼火炎により同じく溶射ガンから吐出したポリエ
チレン、ポリプロピレン又はエチレン酢酸ビニル共重合
体の熱可塑性樹脂粉体を加熱溶融させ、液滴状の熱可塑
性樹脂粉体を管体の内面又は外面に吹付け、付着させて
なる熱可塑性樹脂粉体の溶射を行い、溶射ガンを管体に
対して回転させるか、或いは溶射ガンを管体に近接させ
た状態で管体を回転させ、それと共に溶射ガンを管体の
軸方向に移動させることにより、管体の内面又は外面に
所望膜厚のプラスチックの防食被膜を形成する工程とに
より、管体の内面又は外面にプラスチックの防食被膜を
形成するようにしているので、従来のように加熱装置に
よる管体の加熱を不要となり、プラスチック防食被覆を
行う管体の外径及び長さ寸法の制約がなくなり、防食被
覆のコストが低減できると共に品質が向上し、防食施工
工程や材料の制約がなくなるという効果がある。また、
溶射による熱可塑性樹脂の防食被覆を行う前に管体と熱
可塑性樹脂粉体の双方に接着性のある合成樹脂プライマ
を管体の内面又は外面に塗布しているので、溶射による
火炎によって溶融された熱可塑性樹脂粉体の溶融皮膜が
容易かつ強固に密着させられ、その溶融皮膜の冷却固化
時に剥離やクラックの発生等の欠陥が防止されるという
効果も有する。According to the present invention, a modified polyamidoamine-curable epoxy resin or polychloroprene phenolic resin which has adhesiveness to both the tubular body and the thermoplastic resin powder to be sprayed and does not deteriorate by heat during spraying. A step of applying a synthetic resin primer to the inner surface or the outer surface of the tube to form a primer layer, and allowing the tube coated with the synthetic resin primer to stand at room temperature for at least 30 minutes and at most 120 hours to naturally dry. , A step of curing the primer layer, and after the drying time has elapsed and the primer film is surface dried,
Until the tube completely cures, the tube is not preheated on the primer layer formed on the tube, and the polyethylene, polypropylene or ethylene vinyl acetate mixture discharged from the spray gun is also discharged by the combustion flame of the mixed gas discharged from the spray gun. The thermoplastic resin powder of the polymer is heated and melted, and the droplet-shaped thermoplastic resin powder is sprayed onto the inner surface or the outer surface of the pipe body to spray the thermoplastic resin powder, and the spray gun is used. By rotating the tube with respect to the tube or by rotating the tube with the spray gun in the vicinity of the tube and moving the spray gun in the axial direction of the tube, the inner surface or the outer surface of the tube is changed. Since the plastic anticorrosive coating is formed on the inner surface or the outer surface of the pipe by the step of forming the plastic anticorrosive coating of the desired film thickness, it is possible to heat the pipe by a heating device as in the conventional case. Needed next, there is no restriction of the outer diameter and the length of the tube to perform plastic anticorrosive coating, improved quality can be reduced the cost of anticorrosion coating, there is an effect that restriction of corrosion construction processes and materials is eliminated. Also,
Before the anti-corrosion coating of the thermoplastic resin by thermal spraying, the synthetic resin primer, which has adhesiveness to both the tubular body and the thermoplastic resin powder, is applied to the inner or outer surface of the tubular body, so that it is melted by the flame due to thermal spraying. In addition, the molten coating of the thermoplastic resin powder can be easily and firmly adhered to it, and defects such as peeling and cracking can be prevented when the molten coating is cooled and solidified.
【図１】本発明方法が実施される装置の概略を示す構成
図である。FIG. 1 is a schematic diagram showing an outline of an apparatus in which a method of the present invention is implemented.
【図２】同装置の概略を示す断面図である。FIG. 2 is a cross-sectional view showing an outline of the same device.
【図３】本発明方法が実施される別の装置の概略を示す
構成図である。FIG. 3 is a schematic diagram showing another apparatus in which the method of the present invention is carried out.
１ 管体 ２ プライマ層 ３ プラスチック防食被覆 ６ 管体回転装置 ７ 溶射ガン ９ 溶射ガン駆動装置 １０ 溶射材供給装置 DESCRIPTION OF SYMBOLS 1 Pipe 2 Primer layer 3 Plastic anticorrosion coating 6 Pipe rotating device 7 Thermal spray gun 9 Thermal spray gun drive 10 Thermal spray material supply device
Claims (1)
食被覆を施す方法において、 管体と溶射される熱可塑性樹脂粉体の双方に接着性を有
し、溶射時に熱劣化しない変性ポリアミドアミン硬化型
エポキシ樹脂、又はポリクロロプレーンフェノール樹脂
の合成樹脂プライマを管体の内面又は外面に塗布してプ
ライマ層を形成する工程と、 合成樹脂プライマが塗布された管体を室温の状態で少な
くとも３０分、多くとも１２０時間経過させて自然乾燥
させ、前記プライマ層を硬化させる工程と、 前記乾燥時間が経過し、プライマ皮膜が表面乾燥した
後、完全硬化するまでの間に、管体に形成されたプライ
マ層上に管体を予熱しないで、溶射ガンから吐出した混
合ガスの燃焼火炎により同じく溶射ガンから吐出したポ
リエチレン、ポリプロピレン又はエチレン酢酸ビニル共
重合体の熱可塑性樹脂粉体を加熱溶融させ、液滴状の熱
可塑性樹脂粉体を管体の内面又は外面に吹付け、付着さ
せてなる熱可塑性樹脂粉体の溶射を行い、溶射ガンを管
体に対して回転させるか、或いは溶射ガンを管体に近接
させた状態で管体を回転させ、それと共に溶射ガンを管
体の軸方向に移動させることにより、管体の内面又は外
面に所望膜厚のプラスチックの防食被膜を形成する工程
とを、 備えたことを特徴とする管体防食溶射被覆方法。1. A method for applying an anticorrosive coating of plastic to the inner surface or outer surface of a tubular body, which comprises a modified polyamidoamine cure which has adhesiveness to both the tubular body and the thermoplastic resin powder to be sprayed and does not deteriorate by heat during thermal spraying. Type
Epoxy resin or polychloroprene phenolic resin
The step of applying the synthetic resin primer of 1. to the inner surface or the outer surface of the tubular body to form the primer layer, and the tubular body coated with the synthetic resin primer is allowed to stand at room temperature for at least 30 minutes and at most 120 hours, and then naturally dried. Then, the step of curing the primer layer, and after the drying time has elapsed, after the surface of the primer film is dry, until the tube is completely cured, do not preheat the tube on the primer layer formed on the tube. , Po was also discharged from the spray gun by the combustion flame of the gas mixture discharged from the spray gun
Polyethylene, polypropylene or ethylene vinyl acetate
The thermoplastic resin powder of the polymer is heated and melted, and the droplet-shaped thermoplastic resin powder is sprayed onto the inner surface or the outer surface of the pipe body to spray the thermoplastic resin powder, and the spray gun is used. By rotating the tube with respect to the tube or by rotating the tube with the spray gun in the vicinity of the tube and moving the spray gun in the axial direction of the tube, the inner surface or the outer surface of the tube is changed. And a step of forming a plastic anticorrosion coating having a desired film thickness.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3137793A JPH0811206B2 (en) | 1991-06-10 | 1991-06-10 | Tubular anticorrosion spray coating method |
| TW081103880A TW228481B (en) | 1991-06-10 | 1992-05-19 | |
| KR1019920009136A KR930000166A (en) | 1991-06-10 | 1992-05-28 | Pipe spray coating method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3137793A JPH0811206B2 (en) | 1991-06-10 | 1991-06-10 | Tubular anticorrosion spray coating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04363163A JPH04363163A (en) | 1992-12-16 |
| JPH0811206B2 true JPH0811206B2 (en) | 1996-02-07 |
Family
ID=15206985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3137793A Expired - Fee Related JPH0811206B2 (en) | 1991-06-10 | 1991-06-10 | Tubular anticorrosion spray coating method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0811206B2 (en) |
| KR (1) | KR930000166A (en) |
| TW (1) | TW228481B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2367264C (en) * | 2001-01-19 | 2006-03-14 | Illinois Tool Works Inc. | Coated film forming method and apparatus therefor |
| US7163584B1 (en) * | 2004-08-25 | 2007-01-16 | The United States Of America As Represented By The Secretary Of The Navy | Apparatus for applying liquid liner to rocket tube |
| JP5286971B2 (en) * | 2008-06-25 | 2013-09-11 | 株式会社Ｉｈｉ | Cylindrical painting device and painting method |
| US10336482B2 (en) * | 2016-10-21 | 2019-07-02 | General Electric Technology Gmbh | System, method and apparatus for preserving and capping tubes |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572498B2 (en) * | 1971-08-12 | 1982-01-16 | ||
| JPS5844031B2 (en) * | 1978-05-23 | 1983-09-30 | 文三 平野 | paint spraying equipment |
| JPS5827813Y2 (en) * | 1978-07-24 | 1983-06-16 | 新日本製鐵株式会社 | Pressure conversion type steel pipe inner surface automatic coating machine |
| JPH0722385B2 (en) * | 1988-08-26 | 1995-03-08 | 日本放送協会 | Narrow-band multiplex subsample transmitter and transmitter / receiver |
| JPH0342078A (en) * | 1989-07-11 | 1991-02-22 | Nippon Steel Corp | Method for heavy corrosion protective coating of steel products and product thereof |
-
1991
- 1991-06-10 JP JP3137793A patent/JPH0811206B2/en not_active Expired - Fee Related
-
1992
- 1992-05-19 TW TW081103880A patent/TW228481B/zh active
- 1992-05-28 KR KR1019920009136A patent/KR930000166A/en not_active Application Discontinuation
Non-Patent Citations (1)
| Title |
|---|
| 「溶射便覧」、日本溶射協会編（昭和３９年５月３１日発行）、日刊工業新聞社、Ｐ．８０４−８１８ |
Also Published As
| Publication number | Publication date |
|---|---|
| TW228481B (en) | 1994-08-21 |
| KR930000166A (en) | 1993-01-15 |
| JPH04363163A (en) | 1992-12-16 |
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