JPS5867435A - Forming method of synthetic resin covering layer on outer circumference of steel pipe - Google Patents

Forming method of synthetic resin covering layer on outer circumference of steel pipe

Info

Publication number
JPS5867435A
JPS5867435A JP56166144A JP16614481A JPS5867435A JP S5867435 A JPS5867435 A JP S5867435A JP 56166144 A JP56166144 A JP 56166144A JP 16614481 A JP16614481 A JP 16614481A JP S5867435 A JPS5867435 A JP S5867435A
Authority
JP
Japan
Prior art keywords
coating layer
resin coating
covering layer
steel pipe
outer circumference
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
Application number
JP56166144A
Other languages
Japanese (ja)
Inventor
Yuji Ikeda
雄二 池田
Kunio Matsuda
松田　邦男
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP56166144A priority Critical patent/JPS5867435A/en
Publication of JPS5867435A publication Critical patent/JPS5867435A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins

Abstract

PURPOSE:To positively form a cylindrical denatured polyolefine resin covering layer which is excellent in adhesive strength and free from breakage on the outer circumference of a thermosetting type epoxy resin covering layer formed on the outer circumference of a steel pipe by generating a specific negative pressure at the interface between two films. CONSTITUTION:A steel pipe 2 on which a thermosetting type epoxy resin covering layer 2a is formed around its outer circumference is supplied to a circular die 1 of which inlet side and the steel pipe 2 are sealed with a circular packing 3 and molten cylindrical denatured polyolefine resin covering layer 2b is extruded from the circular die 1 and at the same time air inside the circular die 1 is sucked by a vacuum pump 5 through a blower pipe 4 and the covering layer 2b is caused to adhere to the outer circumference of the covering layer 2a by reducing the pressure of the interface between the covering layers 2a, 2b to a negative pressure of 100-200mm.Hg.

Description

【発明の詳細な説明】 本発明は、鋼管外周面の合成樹脂被覆層の形成方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a synthetic resin coating layer on the outer peripheral surface of a steel pipe.

例えば、環中ケーブルの保護用、海底ケーブルの保護用
等に合成樹脂被覆鋼管が多用されている。For example, synthetic resin-coated steel pipes are often used to protect ring cables, submarine cables, and the like.

特に、極寒地敷設用、海底敷設用等、苛酷な環境、条件
下において用いられる合成樹脂被覆鋼管にあっては、鋼
管と合成樹脂被覆層との間に高い接着強度が要求される
。In particular, synthetic resin-coated steel pipes used in harsh environments and conditions, such as those installed in extremely cold regions or on the seabed, require high adhesive strength between the steel pipe and the synthetic resin coating layer.

従来、接着強度の高い合成樹脂被覆層を得る方法として
、例えば鋼管の外周面に、先ず熱硬化性エポキシ樹脂被
覆層を形成し、この熱硬化性エポキシ樹脂被覆層の外周
面に、無水マレイン酸のよつな不飽和カルボン酸によっ
て変性した変性ポリオレフィン樹脂被覆層を形成し、こ
の変性ポリオレフィン樹脂被覆層を中間層とするとと゛
により、その外周面に防食層としてポリエチレン樹脂を
被覆する製造方法が知られている。Conventionally, as a method for obtaining a synthetic resin coating layer with high adhesive strength, for example, a thermosetting epoxy resin coating layer is first formed on the outer circumferential surface of a steel pipe, and maleic anhydride is applied to the outer circumferential surface of this thermosetting epoxy resin coating layer. A manufacturing method is known in which a modified polyolefin resin coating layer modified with a highly unsaturated carboxylic acid is formed, and this modified polyolefin resin coating layer is used as an intermediate layer. It is being

ところで、前記の如く、熱硬化性エポキシ樹脂被覆層の
外周面に、変性ポリオレフィン樹脂被覆層を形成するに
当っては、変性ポリオレフィン樹脂の融点以上に鋼管を
加熱することと、変性ポリオレフィン樹脂被覆層を、熱
硬化性エポキシ樹脂被覆層に充分圧着させることが必要
である。By the way, as mentioned above, in forming the modified polyolefin resin coating layer on the outer peripheral surface of the thermosetting epoxy resin coating layer, it is necessary to heat the steel pipe to a temperature higher than the melting point of the modified polyolefin resin, and to form the modified polyolefin resin coating layer on the outer peripheral surface of the thermosetting epoxy resin coating layer. It is necessary to sufficiently press the thermosetting epoxy resin coating layer onto the thermosetting epoxy resin coating layer.

前記変性ポリオレフィン樹脂被覆層を形成するポリオレ
フィン樹脂を、熱硬化性エポキン樹脂被覆層の外周面へ
巻付けながら、加圧ロールにより熱硬化性エポキシ樹脂
被覆層へ圧着しているが、ロール疵、シーム重層部のズ
レ、接着力不足等を生ずる問題があった。The polyolefin resin forming the modified polyolefin resin coating layer is wrapped around the outer circumferential surface of the thermosetting epoxy resin coating layer and pressed onto the thermosetting epoxy resin coating layer using a pressure roll, but roll flaws and seams may occur. There were problems such as misalignment of the layered parts and insufficient adhesive strength.

丸タ′イ方式の場合は、丸ダイからの２００℃前後の溶
融円筒状変性ポリオレフィン樹脂を、熱硬化性エポキシ
樹脂被覆層の外周面へ被覆するのであるが、この場合、
前記Ｔダイ方式の如く加圧ロールにより溶融円筒状変性
ポリオレフィン樹脂被覆層を、熱硬化性エポキシ樹脂被
覆層に均一に圧着することは困難であり、接着不良およ
び空気の巻込み等を来たすことから、図に示す如く、丸
ダイ１の入側と、外周面に熱硬化性エポキシ樹脂被覆層
２ａが形成されている鋼管２とを、例えば硬質ゴムから
なる環状バッキング３によってシールし、丸ダイ１の出
側から押出され、かつ熱硬化性エポキシ樹脂被覆層’２
ａの外周面に被覆されている溶融円筒状変性ポリオレフ
ィン樹脂被覆層２ｂと、熱硬化性エポキシ樹脂被覆層２
ａとの界面を、丸ダイ１０入側から丸ダイ１内に連通さ
せたプロアパイプ４を介し、真空ポンプ５により丸ダイ
１内の空気を吸引することによって負圧化し、それによ
り空気の巻込みを防止しながら、変性ポリオレフィン樹
脂被覆層２ｂを、熱硬化性エボキン樹脂被覆層２ａの外
周面に密着させることが試みられている。なお、図中６
は吸引調整弁である。In the case of the round tie method, molten cylindrical modified polyolefin resin at around 200°C from a round die is coated on the outer peripheral surface of the thermosetting epoxy resin coating layer, but in this case,
It is difficult to uniformly press the molten cylindrical modified polyolefin resin coating layer onto the thermosetting epoxy resin coating layer using a pressure roll as in the T-die method, which may result in poor adhesion and air entrainment. As shown in the figure, the entrance side of the round die 1 and the steel pipe 2 having the thermosetting epoxy resin coating layer 2a formed on the outer peripheral surface are sealed with an annular backing 3 made of, for example, hard rubber. The thermosetting epoxy resin coating layer '2 is extruded from the exit side of the
A molten cylindrical modified polyolefin resin coating layer 2b coated on the outer peripheral surface of a, and a thermosetting epoxy resin coating layer 2
The interface with a is made negative pressure by suctioning the air inside the round die 1 with the vacuum pump 5 through the proa pipe 4 which communicates with the inside of the round die 1 from the entrance side of the round die 10, thereby causing the air to be entrained. Attempts have been made to bring the modified polyolefin resin coating layer 2b into close contact with the outer peripheral surface of the thermosetting Evoquin resin coating layer 2a while preventing this. In addition, 6 in the figure
is a suction regulating valve.

この方法は、従来、接着強度の比較的低い通常のポリオ
レフィン樹脂の被覆層形成において採用されており、こ
の場合の熱硬化性エポキシ樹脂被覆層との界面負圧値は
、３５（１＋ｘＡｙ±２０ｍｍＡ＃である。This method has conventionally been used to form a coating layer of ordinary polyolefin resin with relatively low adhesive strength, and in this case, the interfacial negative pressure value with the thermosetting epoxy resin coating layer is 35 (1+xAy±20mmA# It is.

ところが、接着強度の高い変性ポリオレフィン樹脂の軟
化点は、通常のポリオレフィン樹脂の軟化点が１１０〜
１２０℃であるのに対し、９０’Ｃ程度と低く、かつ粘
性も小さい、。However, the softening point of modified polyolefin resin with high adhesive strength is 110~
Compared to 120°C, it is as low as 90'C, and its viscosity is also low.

また変性ポリオレフィン樹脂のメルトインデックス値は
、通常のポリオレフィン樹脂のメルトインデックス値が
０．５であるのに対し、はぼ３．０と大きいため、溶融
状態の変性ポリオレフィン樹脂は極めて扱いにくい問題
があり、従って従来の負圧条件では、変性ポリオレフィ
ン樹脂被覆層に破れが発生し、良好な被覆層の形成がで
きなかった。In addition, the melt index value of modified polyolefin resin is as large as 3.0, compared to 0.5 for ordinary polyolefin resin, so modified polyolefin resin in a molten state is extremely difficult to handle. Therefore, under conventional negative pressure conditions, the modified polyolefin resin coating layer would break, making it impossible to form a good coating layer.

と、変性ポリオレフィン樹脂被覆層との界面の負圧範囲
を種々変えて、形成された変性ポリオレフィン樹脂被覆
層の性状および熱硬化性エポキシ樹脂被覆層に対する接
着強度を調査したところ、下記第１表に示す結果が得ら
れた。The properties of the formed modified polyolefin resin coating layer and the adhesive strength to the thermosetting epoxy resin coating layer were investigated by varying the range of negative pressure at the interface with the modified polyolefin resin coating layer, and the results are shown in Table 1 below. The following results were obtained.

第１表 上記第１表にて明らかな如く、熱硬化性エポキシ樹脂被
覆層と、変性ポリオレフィン樹脂被覆層との界面の負圧
は、１００　＝　２００１１１１ＡＩの範囲が最適であ
ることが判った。Table 1 As is clear from Table 1 above, it was found that the optimal negative pressure at the interface between the thermosetting epoxy resin coating layer and the modified polyolefin resin coating layer was in the range of 100 = 2001111AI.

なお、通常のポリオレフィン樹脂被覆層と熱硬化性エポ
キシ樹脂被覆層との接着強度（負圧３５０１１＃　−ｆ
　２０醍Ｍ）は、３〜５　ＫｐＷｆ／ｍ幅である。In addition, the adhesive strength between the normal polyolefin resin coating layer and the thermosetting epoxy resin coating layer (negative pressure 35011# -f
20 M) has a width of 3 to 5 KpWf/m.

実施例１ 外径６Ｓ／８′、肉厚０．３７５’の鋼管の外周面に、
ｌＯ〜３０μの熱硬化性エポキノ樹脂被覆層を形成し、
この鋼管を１３０℃に予熱すると共に、ラインスピード
４ｍ／ｆ＋にて熱硬化性エポキシ樹脂被覆層の外周面に
、丸ダイからの溶融円筒状変性ポリオレフィン樹脂を被
覆するに当り、熱硬化性エポキシ樹脂被覆層と、変性ポ
リオレフィン樹脂被覆層（０，５ｍｍ）との界面の負圧
をｌ♂２にしたところ、形成された変性ポリオレフィン
樹脂被覆層には、何等破れおよび気泡の発生はなく、シ
かも熱硬化性エポキシ樹脂被覆層との接着強度も＋ＯＫ
ｑＷＶｃｍ幅と良好であった。Example 1 On the outer peripheral surface of a steel pipe with an outer diameter of 6S/8' and a wall thickness of 0.375',
Form a thermosetting epochino resin coating layer of lO ~ 30μ,
This steel pipe was preheated to 130°C, and the outer peripheral surface of the thermosetting epoxy resin coating layer was coated with molten cylindrical modified polyolefin resin from a round die at a line speed of 4 m/f+. When the negative pressure at the interface between the coating layer and the modified polyolefin resin coating layer (0.5 mm) was set to 1♂2, the formed modified polyolefin resin coating layer did not have any ruptures or bubbles, and it was confirmed that there were no cracks or bubbles. Adhesive strength with thermosetting epoxy resin coating layer is also good
The width was qWVcm, which was good.

実施例２ 外径８％′、肉厚０．３７４）’の鋼管の外周面に、１
０〜３０μの熱硬化性エポキシ樹脂被覆層を形成し、こ
の鋼管を１５０℃に予熱すると共に、ラインスピード３
．５ｍ、％にて熱硬化性エポキシ樹脂被覆層の外周面に
、丸ダイからの溶融円筒状変性ポリオレフィン樹脂を被
覆するに当り、熱硬化性エボキ／樹脂被覆層ポリオレフ
ィン樹脂被覆層には、何等破れおよび気泡の発生はなく
、シかも熱硬化性エポキシ樹脂被覆層との接着強度も１
０　ｂｗｔ以−レー幅と良好であった。Example 2 On the outer peripheral surface of a steel pipe with an outer diameter of 8%' and a wall thickness of 0.374)
A thermosetting epoxy resin coating layer of 0 to 30 μm is formed, and the steel pipe is preheated to 150°C, and the line speed is set to 3.
．． When coating the outer peripheral surface of the thermosetting epoxy resin coating layer with molten cylindrical modified polyolefin resin from a round die at 5 m, %, there was no tearing in the thermosetting epoxy/resin coating layer polyolefin resin coating layer. There is no generation of bubbles, and the adhesive strength with the thermosetting epoxy resin coating layer is 1.
It was good with a lay width of 0 bwt or more.

【図面の簡単な説明】[Brief explanation of drawings]

図は丸ダイからの溶融円筒状変性ポリオレフィン樹脂被
覆層と、鋼管外周面の熱硬化性エポキシ樹脂被覆層との
界面負圧化の概略説明図である。 出願人　　　川崎製鉄株式会社The figure is a schematic explanatory diagram of creating a negative pressure at the interface between the molten cylindrical modified polyolefin resin coating layer from the round die and the thermosetting epoxy resin coating layer on the outer peripheral surface of the steel pipe. Applicant: Kawasaki Steel Corporation

Claims (1)

【特許請求の範囲】[Claims] 鋼管の外周面に形成された熱硬化性エポキシ樹脂被覆層
の外周面に、丸ダイからの溶融円筒状変性ポリオレフィ
ン樹脂を被覆するに当り、熱硬化性エポキシ樹脂被覆層
と、変性ポリオレフィン樹脂被覆層との界面を、１００
〜２００ｍ＋＋１Ａ＃の負圧にすることを特徴とする鋼
管外周面の合成樹脂被覆層の形成方法。When coating the outer circumferential surface of the thermosetting epoxy resin coating layer formed on the outer circumferential surface of the steel pipe with the molten cylindrical modified polyolefin resin from the round die, the thermosetting epoxy resin coating layer and the modified polyolefin resin coating layer are coated. The interface with 100
A method for forming a synthetic resin coating layer on the outer circumferential surface of a steel pipe, the method comprising creating a negative pressure of ~200m++1A#.
JP56166144A 1981-10-17 1981-10-17 Forming method of synthetic resin covering layer on outer circumference of steel pipe Pending JPS5867435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56166144A JPS5867435A (en) 1981-10-17 1981-10-17 Forming method of synthetic resin covering layer on outer circumference of steel pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56166144A JPS5867435A (en) 1981-10-17 1981-10-17 Forming method of synthetic resin covering layer on outer circumference of steel pipe

Publications (1)

Publication Number Publication Date
JPS5867435A true JPS5867435A (en) 1983-04-22

Family

ID=15825857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56166144A Pending JPS5867435A (en) 1981-10-17 1981-10-17 Forming method of synthetic resin covering layer on outer circumference of steel pipe

Country Status (1)

Country Link
JP (1) JPS5867435A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04272822A (en) * 1991-02-28 1992-09-29 Gifu Plast Ind Co Ltd Manufacture of steel tube coated with synthetic resin, and die extrusion molding machine
JPH08244093A (en) * 1995-02-13 1996-09-24 Wilhelm Hegler Method and equipment to manufacture multilayered tube that consists of thermoplastics, especially polyolefin

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5559933A (en) * 1978-10-30 1980-05-06 Idemitsu Kosan Co Ltd Coating of member

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5559933A (en) * 1978-10-30 1980-05-06 Idemitsu Kosan Co Ltd Coating of member

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04272822A (en) * 1991-02-28 1992-09-29 Gifu Plast Ind Co Ltd Manufacture of steel tube coated with synthetic resin, and die extrusion molding machine
JPH08244093A (en) * 1995-02-13 1996-09-24 Wilhelm Hegler Method and equipment to manufacture multilayered tube that consists of thermoplastics, especially polyolefin

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