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WO2016047833A1 - Powder coating for steel pipe coating, coated steel pipe, and steel pipe coating method - Google Patents

Powder coating for steel pipe coating, coated steel pipe, and steel pipe coating method Download PDF

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Publication number
WO2016047833A1
WO2016047833A1 PCT/KR2014/009069 KR2014009069W WO2016047833A1 WO 2016047833 A1 WO2016047833 A1 WO 2016047833A1 KR 2014009069 W KR2014009069 W KR 2014009069W WO 2016047833 A1 WO2016047833 A1 WO 2016047833A1
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WO
WIPO (PCT)
Prior art keywords
steel pipe
coating
powder coating
powder
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.)
Ceased
Application number
PCT/KR2014/009069
Other languages
French (fr)
Korean (ko)
Inventor
정화영
김대인
노태준
황석환
윤강재
나재식
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TWO H CHEM Ltd
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TWO H CHEM Ltd
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Filing date
Publication date
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Publication of WO2016047833A1 publication Critical patent/WO2016047833A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/04—Homopolymers or copolymers of ethene
    • C09D123/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
    • C09K2200/0615—Macromolecular organic compounds, e.g. prepolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C09K2200/0632—Polystyrenes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S524/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S524/904—Powder coating compositions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S525/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S525/934—Powdered coating composition

Definitions

  • the present invention relates to a steel pipe coating powder coating, a steel pipe coated with the steel pipe coating powder coating, and a steel pipe coating method using the steel pipe coating powder coating.
  • Steel pipes are widely used in various buildings, structures, and industrial facilities.
  • steel pipes are used as a pipeline for gas, oil, and the like.
  • the steel pipe is coated and used because it is easily damaged in an environment such as rust or cold due to contact with water or air.
  • a coating film was formed by painting a steel pipe using a paint containing an organic solvent or by adhering a film to the steel pipe surface.
  • the organic solvent is not only harmful to the human body and the environment, but its use is limited due to recent environmental regulations, and the film is properly formed in a section where the process is complicated and the surface gradient is severe by bolts or nuts. It's hard to be.
  • a powder coating for coating the surface of the steel pipe has been proposed, but the adhesive strength, surface hardness, and abrasion resistance to the surface of the steel pipe is weak, so that there is a problem of easily peeling or breaking from the steel pipe.
  • the present invention is coated on the surface of the steel pipe to provide a powder coating for steel pipe coating for protecting the steel pipe.
  • the present invention provides a powder coating material for steel pipe coating having excellent physical properties.
  • the present invention provides a powder coating material for steel pipe coating having excellent adhesive strength with steel pipes.
  • the present invention provides a powder coating material for steel pipe coating having excellent surface hardness.
  • the present invention provides a powder coating material for steel pipe coating excellent in wear resistance.
  • the present invention provides a coated steel pipe coated by the powder coating material for steel pipe coating.
  • the present invention provides a steel pipe coating method using the powder coating material for steel pipe coating.
  • the present invention provides a method for coating a steel pipe with a simple process.
  • the powder coating material for steel pipe coating according to the embodiments of the present invention includes a modified polyethylene resin, a polystyrene resin, and an adhesive resin.
  • Melt flow index (190 °C, 2.16kg) of the steel pipe coating powder coating may be 3 ⁇ 40g / 10 minutes.
  • the modified polyethylene resin may be formed by grafting maleic anhydride on at least one selected from polyethylene, high density polyethylene, low density polyethylene, and linear low density polyethylene.
  • the polystyrene-based resin may include at least one selected from general purpose polystyrene, high impact polystyrene, and polystyrene copolymer, and the polystyrene copolymer may include styrene-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer, and styrene.
  • the adhesive resin is selected from polyolefin rubber, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), polypropylene (PP), and butadiene rubber (BR). It may include one or more, the polyolefin rubber may include one or more selected from ethylene octene copolymer, ethylene butene copolymer, ethylene propylene copolymer, ethylene propylene diene monomer rubber, and ethylene propylene monomer rubber.
  • the modified polyethylene resin may be included in an amount of 10 to 50 parts by weight, 5 to 30 parts by weight of the polystyrene resin, and 30 to 60 parts by weight of the adhesive resin, based on 100 parts by weight of the powder coating material.
  • the coated steel pipe according to embodiments of the present invention includes a steel pipe and a coating film provided on the surface of the steel pipe, and the coating film is formed by the powder coating material for coating the steel pipe.
  • the coated steel pipe may further include a primer film provided between the steel pipe and the coating film, and the primer film may be formed by an epoxy resin.
  • Steel pipe coating method comprises the steps of treating the surface of the steel pipe, providing a powder coating for coating the steel pipe on the surface of the steel pipe to form a coating film, and curing the coating film do.
  • the surface treatment step may include a heating process and a sanding treatment process.
  • the steel pipe may be induction heated.
  • the coating film may be formed by flow deposition coating or electrostatic coating.
  • the forming of the coating film may include forming an primer film by providing an epoxy resin powder on the surface of the steel pipe before providing the powder coating material for coating the steel pipe.
  • Powder coating for steel pipe coating according to embodiments of the present invention is excellent in physical properties such as adhesive strength, surface hardness, wear resistance, impact resistance, bending resistance, coating properties, water resistance, flexibility, cold resistance.
  • the powder coating material for steel pipe coating is excellent in adhesive strength with the surface of the steel pipe can be bonded to the steel pipe for a long time to protect the steel pipe.
  • the powder coating material for steel pipe coating may have improved strength due to excellent surface hardness.
  • the powder coating material for steel pipe coating may have excellent wear resistance.
  • the coated steel pipe coated by the powder coating material for steel pipe coating can be used for a long time without being damaged in various environmental conditions.
  • the steel pipe coating powder coating may be used to coat the surface of the steel pipe in a simple process.
  • FIG. 1 shows a coated steel pipe according to an embodiment of the present invention.
  • FIG. 2 shows a coated steel pipe according to another embodiment of the present invention.
  • the powder coating material for steel pipe coating may include a modified polyethylene resin, a polystyrene resin, and an adhesive resin.
  • the powder coating may include 10 to 50 parts by weight of the modified polyethylene resin, 5 to 30 parts by weight of the polystyrene resin, and 30 to 60 parts by weight of the adhesive resin.
  • Melt flow index (190 °C, 2.16kg) of the powder coating is preferably 3 ⁇ 40g / 10 minutes. If the melt flow index is less than 3g / 10min, the flowability of the powder coating melted during coating may be too low, and the coating may not be formed properly. If the meltflow index is more than 40g / 10min, the flowability of the powder coating is too high, resulting in uneven coating. You may not.
  • the modified polyethylene resin may be formed by grafting maleic anhydride on at least one selected from polyethylene, high density polyethylene, low density polyethylene, and linear low density polyethylene.
  • the modified polyethylene may be formed by adding a maleic anhydride (MAH, maleic anhydride), peroxide, and antioxidant to the high density polyethylene, followed by reaction extrusion in a twin screw extruder at 120 to 200 ° C.
  • the peroxide breaks off the ethylene bond of the high density polyethylene to form radicals, and the maleic anhydride is grafted onto the high density polyethylene.
  • the maleic anhydride may be grafted onto the high density polyethylene to form a modified polyethylene having a polar group.
  • the maleic anhydride may be added in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of polyethylene to be modified. If the content of maleic anhydride is less than 0.1 parts by weight, the graft ratio may be low, and thus, the adhesive force may be lowered. If the content of maleic anhydride is less than 3 parts by weight, unreacted maleic anhydride may remain.
  • the peroxide is dicumyl peroxide, benzoyl peroxide, t-butylperoxy-2-ethyl hexanoate, p-chlorobenzoyl peroxide, t-butylperoxy isobutyrate, t-butylperoxy isopropyl carbonate, 2 , 5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxy acetate, di-t-butyl diperoxy phthalate, t-butylperoxy maleic acid, cyclohexanone peroxide, t-butyl At least one selected from peroxy benzoate, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, t-butyl cumyl peroxide, t-butyl hydroperoxide and di-t-butyl peroxide It may include.
  • the antioxidant may include, for example, alkylphenol, alkylene bisphenol, alkylphenol thioether, aromatic amine and the like.
  • the adhesive strength may be lowered or the durability of the coating film may be lowered. have.
  • the polystyrene-based resin may include general purpose polystyrene (GPPS), high impact polystyrene (HIPS), polystyrene copolymer, and the like.
  • the polystyrene copolymer is, for example, styrene-butadiene copolymer (SBR), acrylonitrile-butadiene-styrene copolymer (ABS), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butylene-styrene Copolymer (SEBS), styrene-ethylene-butadiene-styrene copolymer (SEBS), and the like.
  • SBR styrene-butadiene copolymer
  • ABS acrylonitrile-butadiene-styrene copolymer
  • SBS styrene-butadiene-st
  • the powder coating material may have a higher surface hardness and further improved strength.
  • the effect of surface hardness may be insignificant, and when the content of the polystyrene resin is more than 30 parts by weight, the physical properties of the powder coating may be lowered.
  • the adhesive resin is one selected from polyolefin rubber, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), polypropylene (PP), and butadiene rubber (BR). It may contain the above.
  • the polyolefin-based rubber may include ethylene octene copolymer, ethylene butene copolymer, ethylene propylene copolymer, ethylene propylene diene monomer rubber, ethylene propylene monomer rubber, and the like.
  • the adhesive strength may be lowered.
  • the content of the adhesive resin is greater than 60 parts by weight, physical properties of the powder coating material may be lowered.
  • the powder coating may further include one or more selected from antioxidants, heat stabilizers, pigments, dispersion stabilizers, ultraviolet stabilizers, and plasticizers.
  • the powder coating material is 0.1 to 3 parts by weight of the antioxidant, 0.1 to 3 parts by weight of the heat stabilizer, 1 to 3 parts by weight of the pigment, 0.5 to 3 parts by weight of the dispersion stabilizer based on 100 parts by weight of the powder paint. 0.1 to 1 part by weight of the UV stabilizer, and 0.1 to 1 part by weight of the plasticizer.
  • the antioxidant may include, for example, alkylphenol, alkylene bisphenol, alkylphenol thioether, aromatic amine and the like.
  • the thermal stabilizer may include Cd / Ba / Zn-based, Cd / Ba-based, Ba / Zn-based, Ca / Zn-based, Na / Za-based, Sn-based, Pb-based, Cd-based, Zn-based stabilizers, and the like.
  • the pigments may include, for example, iron oxide, blue wire, ultramarine blue, cadmium red, chrome yellow and the like.
  • the dispersion stabilizer may include polyamide wax, polytetrafluoroethylene, polyacrylate, and the like.
  • the powder coating composition may include various additives.
  • the dispersion stabilizer may prevent aggregation of the additives during storage or painting, and may improve smoothness of the coating film.
  • the ultraviolet stabilizer may include, for example, benzotriazole, salicylic acid ester, hydroxybenzophenol, acrylonitrile, and the like.
  • the plasticizer may include, for example, dibutyl phthalate, dioctyl phthalate, diisodecyl phthalate, trioctyl phosphate, and the like.
  • the modified polyethylene, the polystyrene-based resin, the adhesive resin, and the additives are mixed and then reacted and extruded in a twin screw extruder to form a powder coating resin in pellet form.
  • the pellet-type powder coating resin may be ground using mechanical grinding and / or freezing grinding to form a powder coating having a particle size of 250 ⁇ m or less, preferably 150 to 200 ⁇ m.
  • Powder coating material having a particle size of 150 ⁇ 200 ⁇ m was prepared in the ingredients and contents shown in Table 1 below.
  • the modified polyethylene is formed by grafting maleic anhydride on high density polyethylene.
  • Example 1 (parts by weight, kg)
  • Example 2 (parts by weight, kg)
  • Example 3 (parts by weight, kg)
  • Example 4 (parts by weight, kg)
  • Modified polyethylene 30 30 20 40 polystyrene 5 5 5 5 5 Styrene ethylene butadiene styrene copolymer 10 5 15 20 Ethylene Butene Copolymer 10 15 15 5
  • Low density polyethylene 10 10 10 5 Linear Low Density Polyethylene 5 5 5 5 5 5
  • High density polyethylene 10 10
  • Ethylene Vinyl Acetate 5 5 5 5
  • Butadien rubber 5
  • Antioxidant 0.2 0.2 0.2 0.2 0.2 0.2
  • Heat stabilizer 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Pigment 2 2 2 2
  • UV stabilizer 0.5 0.5 0.5 0.5 0.5
  • Plasticizer 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
  • a coating film was formed on the surface of the steel pipe with the powder coating material of Table 1 to evaluate the physical properties thereof, and the results are shown in Table 2 below.
  • Example 1 Example 2
  • Example 3 Example 4 Melt Flow Index (g / 10min) ASTM D 1238 30.9 31.1 33.3 29.3 Adhesive Strength (kgf / 25mm) KS F 4737 16.1 15.9 14.8 17.5 Surface hardness Shore a 97 95 98 99 Abrasion Resistance (mg) ASTM A 934 5.4 6.8 4.7 3.9 Impact resistance JIS K 5600 clear clear clear clear Flex resistance JIS K 5600 Good Good Good Good Coating Visual evaluation Good Good Good Good Good Good
  • the powder coating prepared according to the composition according to Examples 1 to 4 is excellent in physical properties such as adhesive strength, surface hardness, wear resistance, impact resistance, flex resistance, coating properties.
  • FIG. 1 shows a coated steel pipe according to an embodiment of the present invention.
  • the coated steel pipe 10 includes a steel pipe 11 and a coating film 13 formed on a surface thereof.
  • the coating film 13 may be formed using a powder coating material for steel pipe coating according to embodiments of the present invention.
  • the coating film 13 may have a thickness of 400 ⁇ 600 ⁇ m.
  • the powder coating includes a modified polyethylene resin, a polystyrene resin, and an adhesive resin, so that the coating film 13 formed by the powder coating may be formed in a single layer because of excellent adhesive strength with the surface of a steel pipe, and has a surface hardness. It can have high strength.
  • the coating film 13 has excellent properties such as adhesive strength, surface hardness, wear resistance, impact resistance, bending resistance, coating resistance, water resistance, flexibility, cold resistance, etc., so that the coated steel pipe 10 can be used for a long time without being damaged in various environmental conditions. Can be.
  • FIG. 2 shows a coated steel pipe according to another embodiment of the present invention.
  • the coated steel pipe 10 includes a steel pipe 11, a primer film 12, and a coating film 13.
  • the primer film 12 may be formed of an epoxy resin, and the coating film 13 may be formed using a powder coating material for steel pipe coating according to embodiments of the present invention.
  • the primer film 12 may have a thickness of 200 to 300 ⁇ m, and the coating film 13 may have a thickness of 400 to 600 ⁇ m.
  • Method for coating a steel pipe according to an embodiment of the present invention, the step of treating the surface of the steel pipe, providing a powder coating for steel pipe coating according to embodiments of the present invention on the surface of the steel pipe to form a coating film, the coating film It may comprise the step of curing.
  • Treat the surface of the steel pipe The steel pipe can be heated to remove foreign matter from the surface, and sanding treatment can be performed.
  • the sanding treatment may serve to help paint the steel pipe surface well.
  • a coating film is formed on the surface of the steel pipe. It provides a powder coating for steel pipe coating according to embodiments of the present invention on the surface of the steel pipe while induction heating the steel pipe using high frequency heat treatment.
  • the powder coating material is heated on the surface of the steel pipe to form a coating film.
  • an epoxy resin powder may be provided on the surface of the steel pipe to form a primer film.
  • the coating film and / or the primer film may be formed by flow deposition coating.
  • the coating film and / or the primer film may be formed by electrostatic coating by providing a high voltage when the powder paint and / or the epoxy resin powder is provided on the steel pipe surface.
  • the powder coating and / or the epoxy resin powder adhere well to the surface of the steel pipe by the flow deposition coating or the electrostatic coating to reduce the consumption of the powder coating and / or the epoxy resin powder, and the coating film and / or the primer The film can be formed quickly and smoothly so that the productivity of the coated steel pipe can be improved.
  • the coating film is cured by heating to dryness. This forms a coated steel pipe coated with the powder coating.
  • the coated steel pipe may be washed with water and then subjected to electrical inspection.
  • Steel pipe coating powder coating according to embodiments of the present invention can be used to coat the steel pipe, the steel pipe coated by the steel pipe coating powder coating can be applied to a variety of facilities, such as gas and oil pipelines under various environmental conditions have.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

Provided are a powder coating for steel pipe coating, a coated steel pipe, and a steel pipe coating method. The powder coating for steel pipe coating contains a modified polyethylene resin, a polyethylene-based resin, and an adhesive resin. The coated steel pipe comprises a steel pipe, and a coating film provided on a surface of the steel pipe, the coating film being formed of the powder coating for steel pipe coating. The steel pipe coating method comprises the steps of: treating the surface of a steel pipe; forming a coating film by providing the powder coating for steel pipe coating on the surface of the steel pipe; and curing the coating film.

Description

강관 코팅용 분체 도료, 코팅 강관 및 강관 코팅 방법Powder coating, coating steel pipe and steel pipe coating method for steel pipe coating

본 발명은 강관 코팅용 분체 도료, 상기 강관 코팅용 분체 도료에 의해 코팅된 강관 및 상기 강관 코팅용 분체 도료를 이용한 강관의 코팅 방법에 관한 것이다.The present invention relates to a steel pipe coating powder coating, a steel pipe coated with the steel pipe coating powder coating, and a steel pipe coating method using the steel pipe coating powder coating.

강관은 다양한 건축물, 구조물, 산업 시설 등에 널리 사용되고 있다. 특히 강관은 가스, 오일 등의 파이프 라인으로 많이 사용된다. 상기 강관은 물이나 대기와 접촉하여 녹이 슬거나 혹한 등의 환경에서 손상되기 쉽기 때문에 도장되어 사용되고 있다. 종래에는 유기 용제가 포함된 도료를 이용하여 강관을 도장하거나 강관 표면에 필름을 접착시켜 도막을 형성하였다. 그러나, 상기 유기 용제는 인체 및 환경에 해로울 뿐만 아니라 최근 환경 규제의 심화로 그 사용이 제한되고 있고, 상기 필름에 의한 도막은 공정이 복잡하고 볼트나 너트 등에 의해 표면 구배가 심한 구간에서는 도막이 제대로 형성되기 어렵다. 최근에 강관의 표면을 코팅하기 위한 분체 도료가 제안되고 있으나 강관 표면과의 접착 강도, 표면 경도, 내마모성이 약하여 강관으로부터 쉽게 박리되거나 파손되는 문제가 있다. Steel pipes are widely used in various buildings, structures, and industrial facilities. In particular, steel pipes are used as a pipeline for gas, oil, and the like. The steel pipe is coated and used because it is easily damaged in an environment such as rust or cold due to contact with water or air. Conventionally, a coating film was formed by painting a steel pipe using a paint containing an organic solvent or by adhering a film to the steel pipe surface. However, the organic solvent is not only harmful to the human body and the environment, but its use is limited due to recent environmental regulations, and the film is properly formed in a section where the process is complicated and the surface gradient is severe by bolts or nuts. It's hard to be. Recently, a powder coating for coating the surface of the steel pipe has been proposed, but the adhesive strength, surface hardness, and abrasion resistance to the surface of the steel pipe is weak, so that there is a problem of easily peeling or breaking from the steel pipe.

상기와 같은 문제점을 해결하기 위하여, 본 발명은 강관 표면에 코팅되어 강관을 보호하기 위한 강관 코팅용 분체 도료를 제공한다.In order to solve the above problems, the present invention is coated on the surface of the steel pipe to provide a powder coating for steel pipe coating for protecting the steel pipe.

본 발명은 물성이 우수한 강관 코팅용 분체 도료를 제공한다.The present invention provides a powder coating material for steel pipe coating having excellent physical properties.

본 발명은 강관과의 접착 강도가 우수한 강관 코팅용 분체 도료를 제공한다.The present invention provides a powder coating material for steel pipe coating having excellent adhesive strength with steel pipes.

본 발명은 표면 경도가 우수한 강관 코팅용 분체 도료를 제공한다.The present invention provides a powder coating material for steel pipe coating having excellent surface hardness.

본 발명은 내마모성이 우수한 강관 코팅용 분체 도료를 제공한다.The present invention provides a powder coating material for steel pipe coating excellent in wear resistance.

본 발명은 상기 강관 코팅용 분체 도료에 의해 코팅된 코팅 강관을 제공한다.The present invention provides a coated steel pipe coated by the powder coating material for steel pipe coating.

본 발명은 상기 강관 코팅용 분체 도료를 이용한 강관 코팅 방법을 제공한다.The present invention provides a steel pipe coating method using the powder coating material for steel pipe coating.

본 발명은 공정이 간단한 강관 코팅 방법을 제공한다.The present invention provides a method for coating a steel pipe with a simple process.

본 발명의 다른 목적들은 다음의 상세한 설명과 첨부한 도면으로부터 명확해 질 것이다.Other objects of the present invention will become apparent from the following detailed description and the accompanying drawings.

본 발명의 실시예들에 따른 강관 코팅용 분체 도료는, 변성 폴리에틸렌 수지, 폴리스티렌계 수지, 및 접착성 수지를 포함한다. 상기 강관 코팅용 분체 도료의 용융흐름지수(190℃, 2.16kg)는 3 ~ 40g/10분일 수 있다.The powder coating material for steel pipe coating according to the embodiments of the present invention includes a modified polyethylene resin, a polystyrene resin, and an adhesive resin. Melt flow index (190 ℃, 2.16kg) of the steel pipe coating powder coating may be 3 ~ 40g / 10 minutes.

상기 변성 폴리에틸렌 수지는, 폴리에틸렌, 고밀도 폴리에틸렌, 저밀도 폴리에틸렌, 및 선형저밀도 폴리에틸렌 중에서 선택된 하나 이상에 무수말레인산을 그라프트시켜 형성될 수 있다.The modified polyethylene resin may be formed by grafting maleic anhydride on at least one selected from polyethylene, high density polyethylene, low density polyethylene, and linear low density polyethylene.

상기 폴리스티렌계 수지는, 범용 폴리스티렌, 고충격 폴리스티렌, 및 폴리스티렌 공중합체 중에서 선택된 하나 이상을 포함할 수 있고, 상기 폴리스티렌 공중합체는, 스티렌-부타디엔 공중합체, 아크릴로니트릴-부타디엔-스티렌 공중합체, 스티렌-부타디엔-스티렌 공중합체, 스티렌-에틸렌-부틸렌-스티렌 공중합체, 및 스티렌-에틸렌-부타디엔-스티렌 공중합체 중에서 선택된 하나 이상을 포함할 수 있다.The polystyrene-based resin may include at least one selected from general purpose polystyrene, high impact polystyrene, and polystyrene copolymer, and the polystyrene copolymer may include styrene-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer, and styrene. Butadiene-styrene copolymer, styrene-ethylene-butylene-styrene copolymer, and styrene-ethylene-butadiene-styrene copolymer.

상기 접착성 수지는, 폴리올레핀계 고무, 저밀도폴리에틸렌(LDPE), 선형저밀도폴리에틸렌(LLDPE), 고밀도 폴리에틸렌(HDPE), 에틸렌비닐아세테이트(EVA), 폴리프로필렌(PP), 및 부타디엔러버(BR) 중에서 선택된 하나 이상을 포함할 수 있고, 상기 폴리올레핀계 고무는 에틸렌 옥텐 공중합체, 에틸렌 부텐 공중합체, 에틸렌 프로필렌 공중합체, 에틸렌 프로필렌 디엔 모노머 고무, 및 에틸렌 프로필렌 모노머 고무 중에서 선택된 하나 이상을 포함할 수 있다.The adhesive resin is selected from polyolefin rubber, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), polypropylene (PP), and butadiene rubber (BR). It may include one or more, the polyolefin rubber may include one or more selected from ethylene octene copolymer, ethylene butene copolymer, ethylene propylene copolymer, ethylene propylene diene monomer rubber, and ethylene propylene monomer rubber.

상기 분체 도료 100중량부에 대하여, 상기 변성 폴리에틸렌 수지는 10 ~ 50중량부, 상기 폴리스티렌계 수지는 5 ~ 30중량부, 상기 접착성 수지는 30 ~ 60중량부로 포함될 수 있다.The modified polyethylene resin may be included in an amount of 10 to 50 parts by weight, 5 to 30 parts by weight of the polystyrene resin, and 30 to 60 parts by weight of the adhesive resin, based on 100 parts by weight of the powder coating material.

본 발명의 실시예들에 따른 코팅 강관은, 강관, 및 상기 강관 표면에 제공된 코팅막을 포함하고, 상기 코팅막은 상기 강관 코팅용 분체 도료에 의해 형성된다.The coated steel pipe according to embodiments of the present invention includes a steel pipe and a coating film provided on the surface of the steel pipe, and the coating film is formed by the powder coating material for coating the steel pipe.

상기 코팅 강관은, 상기 강관과 상기 코팅막 사이에 제공되는 프라이머막을 더 포함할 수 있고, 상기 프라이머막은 에폭시 수지에 의해 형성될 수 있다.The coated steel pipe may further include a primer film provided between the steel pipe and the coating film, and the primer film may be formed by an epoxy resin.

본 발명의 실시예들에 따른 강관 코팅 방법은, 강관의 표면을 처리하는 단계, 상기 강관의 표면에 상기 강관 코팅용 분체 도료를 제공하여 코팅막을 형성하는 단계, 및 상기 코팅막을 경화시키는 단계를 포함한다.Steel pipe coating method according to embodiments of the present invention comprises the steps of treating the surface of the steel pipe, providing a powder coating for coating the steel pipe on the surface of the steel pipe to form a coating film, and curing the coating film do.

상기 표면 처리 단계는 가열 공정과 샌딩 처리 공정을 포함할 수 있다.The surface treatment step may include a heating process and a sanding treatment process.

상기 코팅막 형성 단계에서, 상기 강관은 유도 가열될 수 있다. In the coating film forming step, the steel pipe may be induction heated.

상기 코팅막은 유동 침적 도장 또는 정전 도장에 의해 형성될 수 있다. 상기 코팅막 형성 단계는, 상기 강관 코팅용 분체 도료를 제공하기 전에 상기 강관 표면에 에폭시 수지 분말을 제공하여 프라이머막을 형성하는 단계를 포함할 수 있다. The coating film may be formed by flow deposition coating or electrostatic coating. The forming of the coating film may include forming an primer film by providing an epoxy resin powder on the surface of the steel pipe before providing the powder coating material for coating the steel pipe.

본 발명의 실시예들에 따른 강관 코팅용 분체 도료는 접착강도, 표면경도, 내마모성, 내충격성, 내굴곡성, 코팅성, 내수성, 유연성, 내한성 등의 물성이 우수하다. 특히, 상기 강관 코팅용 분체 도료는 강관 표면과의 접착 강도가 우수하여 오랜 기간 강관에 접착되어 강관을 보호할 수 있다. 상기 강관 코팅용 분체 도료는 표면 경도가 우수하여 향상된 강도를 가질 수 있다. 상기 강관 코팅용 분체 도료는 우수한 내마모성을 가질 수 있다. 상기 강관 코팅용 분체 도료에 의해 코팅된 코팅 강관은 다양한 환경 조건에서 손상되지 않고 장기간 사용될 수 있다. 상기 강관 코팅용 분체 도료를 이용하여 간단한 공정으로 강관 표면을 코팅할 수 있다.Powder coating for steel pipe coating according to embodiments of the present invention is excellent in physical properties such as adhesive strength, surface hardness, wear resistance, impact resistance, bending resistance, coating properties, water resistance, flexibility, cold resistance. In particular, the powder coating material for steel pipe coating is excellent in adhesive strength with the surface of the steel pipe can be bonded to the steel pipe for a long time to protect the steel pipe. The powder coating material for steel pipe coating may have improved strength due to excellent surface hardness. The powder coating material for steel pipe coating may have excellent wear resistance. The coated steel pipe coated by the powder coating material for steel pipe coating can be used for a long time without being damaged in various environmental conditions. The steel pipe coating powder coating may be used to coat the surface of the steel pipe in a simple process.

도 1은 본 발명의 일 실시예에 따른 코팅 강관을 나타낸다.1 shows a coated steel pipe according to an embodiment of the present invention.

도 2는 본 발명의 다른 실시예에 따른 코팅 강관을 나타낸다.2 shows a coated steel pipe according to another embodiment of the present invention.

이하, 실시예들을 통하여 본 발명을 상세하게 설명한다. 본 발명의 목적, 특징, 장점은 이하의 실시예들을 통해 쉽게 이해될 것이다. 본 발명은 여기서 설명되는 실시예들에 한정되지 않고, 다른 형태로 구체화될 수도 있다. 여기서 소개되는 실시예들은 개시된 내용이 철저하고 완전해질 수 있도록 그리고 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 본 발명의 사상이 충분히 전달될 수 있도록 하기 위해 제공되는 것이다. 따라서, 이하의 실시예들에 의하여 본 발명이 제한되어서는 안 된다.Hereinafter, the present invention will be described in detail through examples. The objects, features and advantages of the present invention will be readily understood through the following examples. The invention is not limited to the embodiments described herein, but may be embodied in other forms. The embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and the spirit of the present invention may be sufficiently delivered to those skilled in the art. Therefore, the present invention should not be limited by the following examples.

도면들에서 요소의 크기, 또는 요소들 사이의 상대적인 크기는 본 발명에 대한 더욱 명확한 이해를 위해서 다소 과장되게 도시될 수 있다. 또, 도면들에 도시된 요소의 형상이 제조 공정상의 변이 등에 의해서 다소 변경될 수 있을 것이다. 따라서, 본 명세서에서 개시된 실시예들은 특별한 언급이 없는 한 도면에 도시된 형상으로 한정되어서는 안 되며, 어느 정도의 변형을 포함하는 것으로 이해되어야 한다.In the drawings, the size of elements, or the relative sizes between elements, may be somewhat exaggerated for a clearer understanding of the present invention. In addition, the shape of the elements shown in the drawings may be somewhat changed by variations in the manufacturing process. Accordingly, the embodiments disclosed herein are not to be limited to the shapes shown in the drawings unless specifically stated, it should be understood to include some modification.

[강관 코팅용 분체 도료][Powder coating for steel pipe coating]

본 발명의 실시예들에 따른 강관 코팅용 분체 도료는, 변성 폴리에틸렌 수지, 폴리스티렌계 수지, 및 접착성 수지를 포함할 수 있다. 또, 상기 분체 도료는 상기 변성 폴리에틸렌 수지 10 ~ 50중량부, 상기 폴리스티렌계 수지 5 ~ 30중량부, 상기 접착성 수지 30 ~ 60중량부를 포함할 수 있다.The powder coating material for steel pipe coating according to embodiments of the present invention may include a modified polyethylene resin, a polystyrene resin, and an adhesive resin. In addition, the powder coating may include 10 to 50 parts by weight of the modified polyethylene resin, 5 to 30 parts by weight of the polystyrene resin, and 30 to 60 parts by weight of the adhesive resin.

상기 분체 도료의 용융흐름지수(190℃, 2.16kg)는 3 ~ 40g/10분인 것이 바람직하다. 용융흐름지수가 3g/10분 미만이면 도장시 용융되는 분체 도료의 흐름성이 너무 낮아 도막이 제대로 형성되지 않을 수 있고, 40g/10분 초과이면 분체 도료의 흐름성이 너무 높아 도막의 두께가 균일하지 않을 수 있다.Melt flow index (190 ℃, 2.16kg) of the powder coating is preferably 3 ~ 40g / 10 minutes. If the melt flow index is less than 3g / 10min, the flowability of the powder coating melted during coating may be too low, and the coating may not be formed properly.If the meltflow index is more than 40g / 10min, the flowability of the powder coating is too high, resulting in uneven coating. You may not.

상기 변성 폴리에틸렌 수지는, 폴리에틸렌, 고밀도 폴리에틸렌, 저밀도 폴리에틸렌, 및 선형저밀도 폴리에틸렌 중에서 선택된 하나 이상에 무수말레인산을 그라프트시켜 형성될 수 있다. 예를 들어, 상기 변성 폴리에틸렌은, 고밀도 폴리에틸렌에 무수말레인산(MAH, maleic anhydride), 과산화물(peroxide), 및 산화방지제를 첨가한 후 120 ~ 200℃의 2축 압출기에서 반응 압출하여 형성될 수 있다. 상기 과산화물에 의해 상기 고밀도 폴리에틸렌의 에틸렌 결합이 끊어져서 라디칼이 형성되고, 상기 무수말레인산이 상기 고밀도 폴리에틸렌에 그라프트된다. 상기 그라프트 반응에 의해 상기 무수말레인산이 상기 고밀도 폴리에틸렌에 그라프트되어 극성기를 갖는 변성 폴리에틸렌이 형성될 수 있다. The modified polyethylene resin may be formed by grafting maleic anhydride on at least one selected from polyethylene, high density polyethylene, low density polyethylene, and linear low density polyethylene. For example, the modified polyethylene may be formed by adding a maleic anhydride (MAH, maleic anhydride), peroxide, and antioxidant to the high density polyethylene, followed by reaction extrusion in a twin screw extruder at 120 to 200 ° C. The peroxide breaks off the ethylene bond of the high density polyethylene to form radicals, and the maleic anhydride is grafted onto the high density polyethylene. By the graft reaction, the maleic anhydride may be grafted onto the high density polyethylene to form a modified polyethylene having a polar group.

상기 무수말레인산은 변성할 폴리에틸렌 100중량부에 대하여 0.1 ~ 3중량부로 첨가될 수 있다. 상기 무수말레인산의 함량이 0.1중량부 미만이면 그라프트율이 낮아 접착력이 저하될 수 있고, 3중량부 초과이면 미반응된 무수말레인산이 잔존할 수 있다.The maleic anhydride may be added in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of polyethylene to be modified. If the content of maleic anhydride is less than 0.1 parts by weight, the graft ratio may be low, and thus, the adhesive force may be lowered. If the content of maleic anhydride is less than 3 parts by weight, unreacted maleic anhydride may remain.

상기 과산화물은 디큐밀 퍼옥사이드, 벤조일 퍼옥사이드, t-부틸퍼옥시-2-에틸 헥사노에이트, p-클로로벤조일 퍼옥사이드, t-부틸퍼옥시 이소부티레이트, t-부틸퍼옥시 이소프로필 카보네이트, 2,5-디메틸-2,5-디(벤조일퍼옥시)헥산, t-부틸퍼옥시 아세테이트, 디-t-부틸 디퍼옥시 프탈레이트, t-부틸퍼옥시 말레산, 사이클로헥사논 퍼옥사이드, t-부틸퍼옥시 벤조에이트, 2,5-디메틸-2,5-디(t-부틸퍼옥시)헥산, t-부틸큐밀퍼옥사이드, t-부틸 하이드로퍼옥사이드 및 디-t-부틸 퍼옥사이드 중에서 선택된 하나 이상을 포함할 수 있다.The peroxide is dicumyl peroxide, benzoyl peroxide, t-butylperoxy-2-ethyl hexanoate, p-chlorobenzoyl peroxide, t-butylperoxy isobutyrate, t-butylperoxy isopropyl carbonate, 2 , 5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxy acetate, di-t-butyl diperoxy phthalate, t-butylperoxy maleic acid, cyclohexanone peroxide, t-butyl At least one selected from peroxy benzoate, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, t-butyl cumyl peroxide, t-butyl hydroperoxide and di-t-butyl peroxide It may include.

상기 산화방지제는 예를 들어, 알킬페놀, 알킬렌비스페놀, 알킬페놀티오에테르, 방향족 아민 등을 포함할 수 있다.The antioxidant may include, for example, alkylphenol, alkylene bisphenol, alkylphenol thioether, aromatic amine and the like.

상기 변성 폴리에틸렌의 함량이 상기 분체 도료 100중량부에 대하여 10중량부 미만이면 접착력이 떨어지거나 도막의 내구성이 저하될 수 있고, 50중량부 초과이면 용융 흐름성이 낮아 도막의 두께가 균일하지 않을 수 있다.When the content of the modified polyethylene is less than 10 parts by weight based on 100 parts by weight of the powder coating material, the adhesive strength may be lowered or the durability of the coating film may be lowered. have.

상기 폴리스티렌계 수지는 범용 폴리스티렌(GPPS), 고충격 폴리스티렌(HIPS), 폴리스티렌 공중합체 등을 포함할 수 있다. 상기 폴리스티렌 공중합체는 예를 들어, 스티렌-부타디엔 공중합체(SBR), 아크릴로니트릴-부타디엔-스티렌 공중합체(ABS), 스티렌-부타디엔-스티렌 공중합체(SBS), 스티렌-에틸렌-부틸렌-스티렌 공중합체(SEBS), 스티렌-에틸렌-부타디엔-스티렌 공중합체(SEBS) 등을 포함할 수 있다.The polystyrene-based resin may include general purpose polystyrene (GPPS), high impact polystyrene (HIPS), polystyrene copolymer, and the like. The polystyrene copolymer is, for example, styrene-butadiene copolymer (SBR), acrylonitrile-butadiene-styrene copolymer (ABS), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butylene-styrene Copolymer (SEBS), styrene-ethylene-butadiene-styrene copolymer (SEBS), and the like.

상기 폴리스티렌계 수지를 포함하는 것에 의해 상기 분체 도료는 표면 경도가 높아져 더욱 향상된 강도를 가질 수 있다.By including the polystyrene-based resin, the powder coating material may have a higher surface hardness and further improved strength.

상기 폴리스티렌계 수지의 함량이 상기 분체 도료 100중량부에 대하여 5중량부 미만이면 표면 경도의 효과가 미미할 수 있고, 30중량부 초과이면 분체 도료의 물성이 저하될 수 있다.When the content of the polystyrene resin is less than 5 parts by weight based on 100 parts by weight of the powder coating, the effect of surface hardness may be insignificant, and when the content of the polystyrene resin is more than 30 parts by weight, the physical properties of the powder coating may be lowered.

상기 접착성 수지는 폴리올레핀계 고무, 저밀도폴리에틸렌(LDPE), 선형저밀도폴리에틸렌(LLDPE), 고밀도 폴리에틸렌(HDPE), 에틸렌비닐아세테이트(EVA), 폴리프로필렌(PP), 및 부타디엔러버(BR) 중에서 선택된 하나 이상을 포함할 수 있다. 상기 폴리올레핀계 고무는 에틸렌 옥텐 공중합체, 에틸렌 부텐 공중합체, 에틸렌 프로필렌 공중합체, 에틸렌 프로필렌 디엔 모노머 고무, 에틸렌 프로필렌 모노머 고무 등을 포함할 수 있다.The adhesive resin is one selected from polyolefin rubber, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), polypropylene (PP), and butadiene rubber (BR). It may contain the above. The polyolefin-based rubber may include ethylene octene copolymer, ethylene butene copolymer, ethylene propylene copolymer, ethylene propylene diene monomer rubber, ethylene propylene monomer rubber, and the like.

상기 접착성 수지의 함량이 상기 분체 도료 100중량부에 대하여 30중량부 미만이면 접착 강도가 저하될 수 있고, 60중량부 초과이면 분체 도료의 물성이 저하될 수 있다.When the content of the adhesive resin is less than 30 parts by weight based on 100 parts by weight of the powder coating material, the adhesive strength may be lowered. When the content of the adhesive resin is greater than 60 parts by weight, physical properties of the powder coating material may be lowered.

상기 분체 도료는 산화 방지제, 열 안정제, 안료, 분산 안정제, 자외선 안정제, 및 가소제 중에서 선택된 하나 이상을 더 포함할 수 있다. 예를 들어, 상기 분체 도료는 상기 분체 도료 100중량부에 대하여 상기 산화방지제 0.1 ~ 3중량부, 상기 열 안정제 0.1 ~ 3중량부, 상기 안료 1 ~ 3중량부, 상기 분산 안정제 0.5 ~ 3중량부, 상기 자외선 안정제 0.1 ~ 1중량부, 및 상기 가소제 0.1 ~ 1중량부를 더 포함할 수 있다.The powder coating may further include one or more selected from antioxidants, heat stabilizers, pigments, dispersion stabilizers, ultraviolet stabilizers, and plasticizers. For example, the powder coating material is 0.1 to 3 parts by weight of the antioxidant, 0.1 to 3 parts by weight of the heat stabilizer, 1 to 3 parts by weight of the pigment, 0.5 to 3 parts by weight of the dispersion stabilizer based on 100 parts by weight of the powder paint. 0.1 to 1 part by weight of the UV stabilizer, and 0.1 to 1 part by weight of the plasticizer.

상기 산화방지제는 예를 들어, 알킬페놀, 알킬렌비스페놀, 알킬페놀티오에테르, 방향족 아민 등을 포함할 수 있다. 상기 열 안정제는 Cd/Ba/Zn계, Cd/Ba계, Ba/Zn계, Ca/Zn계, Na/Za계, Sn계, Pb계, Cd계, Zn계 안정제 등을 포함할 수 있다. 상기 안료는 예를 들어, 산화철, 감청, 울트라마린블루, 카드뮴레드, 크롬옐로우 등을 포함할 수 있다. 상기 분산 안정제는, 폴리아미드 왁스, 폴리테트라 플로오로에틸렌, 폴리아크릴레이트 등을 포함할 수 있다. 상기 분체 도료 조성물은 다양한 첨가제를 포함할 수 있는데 상기 분산 안정제는 보관 또는 도장 작업시 상기 첨가제의 응집을 방지할 수 있고, 도막의 평활도를 향상시킬 수 있다. 상기 분산 안정제의 함량이 분체 도료 조성물 100중량부에 대하여 0.5중량부 미만이면 도막의 평활도 개선 효과가 저하될 수 있고, 3중량부 초과이면 도장면이 뿌옇거나 탁해질 수 있다. 상기 자외선 안정제는 예를 들어, 벤조트리아졸, 살리실산에스테르, 히드록시벤조페놀, 아크릴로니트릴 등을 포함할 수 있다. 상기 가소제는 예를 들어, 디부틸프탈레이트, 디옥틸프탈레이트, 디이소데실프탈레이트, 트리옥틸포스페이트 등을 포함할 수 있다.The antioxidant may include, for example, alkylphenol, alkylene bisphenol, alkylphenol thioether, aromatic amine and the like. The thermal stabilizer may include Cd / Ba / Zn-based, Cd / Ba-based, Ba / Zn-based, Ca / Zn-based, Na / Za-based, Sn-based, Pb-based, Cd-based, Zn-based stabilizers, and the like. The pigments may include, for example, iron oxide, blue wire, ultramarine blue, cadmium red, chrome yellow and the like. The dispersion stabilizer may include polyamide wax, polytetrafluoroethylene, polyacrylate, and the like. The powder coating composition may include various additives. The dispersion stabilizer may prevent aggregation of the additives during storage or painting, and may improve smoothness of the coating film. When the content of the dispersion stabilizer is less than 0.5 parts by weight with respect to 100 parts by weight of the powder coating composition, the effect of improving the smoothness of the coating film may be lowered. The ultraviolet stabilizer may include, for example, benzotriazole, salicylic acid ester, hydroxybenzophenol, acrylonitrile, and the like. The plasticizer may include, for example, dibutyl phthalate, dioctyl phthalate, diisodecyl phthalate, trioctyl phosphate, and the like.

상기 변성 폴리에틸렌, 상기 폴리스티렌계 수지, 상기 접착성 수지, 및 상기 첨가제들을 혼합한 후 2축 압출기에서 반응 압출하여 펠렛 형태의 분체 도료용 수지가 형성될 수 있다. The modified polyethylene, the polystyrene-based resin, the adhesive resin, and the additives are mixed and then reacted and extruded in a twin screw extruder to form a powder coating resin in pellet form.

상기 펠렛 형태의 분체 도료용 수지를 기계적 분쇄 및/또는 냉동 분쇄 등을 이용하여 분쇄하여 250㎛ 이하, 바람직하게는 150 ~ 200㎛의 입자 크기를 갖는 분말 형태의 분체 도료가 형성될 수 있다.The pellet-type powder coating resin may be ground using mechanical grinding and / or freezing grinding to form a powder coating having a particle size of 250 μm or less, preferably 150 to 200 μm.

[실시예]EXAMPLE

아래 표 1과 같은 성분과 함량으로 150 ~ 200㎛의 입자 크기를 갖는 분체 도료를 제조하였다. 변성 폴리에틸렌은 고밀도 폴리에틸렌에 무수말레인산을 그라프트시켜 형성된 것이다.Powder coating material having a particle size of 150 ~ 200㎛ was prepared in the ingredients and contents shown in Table 1 below. The modified polyethylene is formed by grafting maleic anhydride on high density polyethylene.

표 1 성분 실시예 1(중량부, kg) 실시예 2(중량부, kg) 실시예 3(중량부, kg) 실시예 4(중량부, kg) 변성 폴리에틸렌 30 30 20 40 폴리스티렌 5 5 5 5 스티렌에틸렌부타디엔스티렌공중합체 10 5 15 20 에틸렌 부텐 공중합체 10 15 15 5 저밀도 폴리에틸렌 10 10 10 5 선형저밀도 폴리에틸렌 5 5 5 5 고밀도 폴리에틸렌 10 10 10 10 에틸렌비닐아세테이트 5 5 5 5 부타디엔러버 5 5 5 5 산화방지제 0.2 0.2 0.2 0.2 열안정제 0.2 0.2 0.2 0.2 안료 2 2 2 2 분산 안정제 1.5 1.5 1.5 1.5 자외선 안정제 0.5 0.5 0.5 0.5 가소제 0.5 0.5 0.5 0.5 Table 1 ingredient Example 1 (parts by weight, kg) Example 2 (parts by weight, kg) Example 3 (parts by weight, kg) Example 4 (parts by weight, kg) Modified polyethylene 30 30 20 40 polystyrene 5 5 5 5 Styrene ethylene butadiene styrene copolymer 10 5 15 20 Ethylene Butene Copolymer 10 15 15 5 Low density polyethylene 10 10 10 5 Linear Low Density Polyethylene 5 5 5 5 High density polyethylene 10 10 10 10 Ethylene Vinyl Acetate 5 5 5 5 Butadien rubber 5 5 5 5 Antioxidant 0.2 0.2 0.2 0.2 Heat stabilizer 0.2 0.2 0.2 0.2 Pigment 2 2 2 2 Dispersion stabilizer 1.5 1.5 1.5 1.5 UV stabilizer 0.5 0.5 0.5 0.5 Plasticizer 0.5 0.5 0.5 0.5

상기 표 1의 분체 도료로 강관의 표면에 코팅막을 형성하여 그 물성을 평가하여 그 결과를 아래 표 2에 나타내었다.A coating film was formed on the surface of the steel pipe with the powder coating material of Table 1 to evaluate the physical properties thereof, and the results are shown in Table 2 below.

표 2 구분 평가방법 실시예 1 실시예 2 실시예 3 실시예 4 용융흐름지수(g/10분) ASTM D 1238 30.9 31.1 33.3 29.3 접착강도(kgf/25mm) KS F 4737 16.1 15.9 14.8 17.5 표면경도 Shore A 97 95 98 99 내마모성(mg) ASTM A 934 5.4 6.8 4.7 3.9 내충격성 JIS K 5600 이상없음 이상없음 이상없음 이상없음 내굴곡성 JIS K 5600 양호 양호 양호 양호 코팅성 육안평가 양호 양호 양호 양호 TABLE 2 division Assessment Methods Example 1 Example 2 Example 3 Example 4 Melt Flow Index (g / 10min) ASTM D 1238 30.9 31.1 33.3 29.3 Adhesive Strength (kgf / 25mm) KS F 4737 16.1 15.9 14.8 17.5 Surface hardness Shore a 97 95 98 99 Abrasion Resistance (mg) ASTM A 934 5.4 6.8 4.7 3.9 Impact resistance JIS K 5600 clear clear clear clear Flex resistance JIS K 5600 Good Good Good Good Coating Visual evaluation Good Good Good Good

상기 표 2를 참조하면, 변성 폴리에틸렌의 함량이 증가할수록 용융흐름지수는 작아지고 접착강도가 커지는 것을 알 수 있다. 또, 폴리스티렌계 수지의 함량이 증가할수록 표면 경도가 커지는 것을 알 수 있다. 상기와 같이, 실시예 1 내지 4에 따른 조성에 따라 제조된 분체 도료는 접착강도, 표면경도, 내마모성, 내충격성, 내굴곡성, 코팅성 등의 물성이 우수함을 알 수 있다.Referring to Table 2, it can be seen that as the content of the modified polyethylene is increased, the melt flow index is decreased and the adhesive strength is increased. In addition, it can be seen that the surface hardness increases as the content of the polystyrene resin increases. As described above, it can be seen that the powder coating prepared according to the composition according to Examples 1 to 4 is excellent in physical properties such as adhesive strength, surface hardness, wear resistance, impact resistance, flex resistance, coating properties.

[코팅 강관][Coated steel pipe]

도 1은 본 발명의 일 실시예에 따른 코팅 강관을 나타낸다.1 shows a coated steel pipe according to an embodiment of the present invention.

도 1을 참조하면, 코팅 강관(10)은 강관(11) 및 그 표면에 형성된 코팅막(13)을 포함한다. 코팅막(13)은 본 발명의 실시예들에 따른 강관 코팅용 분체 도료를 이용하여 형성될 수 있다. 코팅막(13)은 400 ~ 600㎛의 두께를 가질 수 있다.Referring to FIG. 1, the coated steel pipe 10 includes a steel pipe 11 and a coating film 13 formed on a surface thereof. The coating film 13 may be formed using a powder coating material for steel pipe coating according to embodiments of the present invention. The coating film 13 may have a thickness of 400 ~ 600㎛.

상기 분체 도료는 변성 폴리에틸렌 수지, 폴리스티렌계 수지, 및 접착성 수지를 포함하고 있어 상기 분체 도료에 의해 형성된 코팅막(13)은 강관 표면과의 접착 강도가 우수하여 단층으로 형성될 수 있고, 표면 경도가 높아 우수한 강도를 가질 수 있다. 또, 코팅막(13)은 접착강도, 표면경도, 내마모성, 내충격성, 내굴곡성, 코팅성, 내수성, 유연성, 내한성 등의 물성이 우수하여 코팅 강관(10)은 다양한 환경 조건에서 손상되지 않고 장기간 사용될 수 있다.The powder coating includes a modified polyethylene resin, a polystyrene resin, and an adhesive resin, so that the coating film 13 formed by the powder coating may be formed in a single layer because of excellent adhesive strength with the surface of a steel pipe, and has a surface hardness. It can have high strength. In addition, the coating film 13 has excellent properties such as adhesive strength, surface hardness, wear resistance, impact resistance, bending resistance, coating resistance, water resistance, flexibility, cold resistance, etc., so that the coated steel pipe 10 can be used for a long time without being damaged in various environmental conditions. Can be.

도 2는 본 발명의 다른 실시예에 따른 코팅 강관을 나타낸다.2 shows a coated steel pipe according to another embodiment of the present invention.

도 2를 참조하면, 코팅 강관(10)은 강관(11), 프라이머막(12), 및 코팅막(13)을 포함한다. 프라이머막(12)은 에폭시 수지로 형성될 수 있고, 코팅막(13)은 본 발명의 실시예들에 따른 강관 코팅용 분체 도료를 이용하여 형성될 수 있다. 프라이머막(12)은 200 ~ 300㎛의 두께를 가질 수 있고, 코팅막(13)은 400 ~ 600㎛의 두께를 가질 수 있다.Referring to FIG. 2, the coated steel pipe 10 includes a steel pipe 11, a primer film 12, and a coating film 13. The primer film 12 may be formed of an epoxy resin, and the coating film 13 may be formed using a powder coating material for steel pipe coating according to embodiments of the present invention. The primer film 12 may have a thickness of 200 to 300 μm, and the coating film 13 may have a thickness of 400 to 600 μm.

[강관의 코팅 방법][Coating method of steel pipe]

본 발명의 일 실시예에 따른 강관의 코팅 방법은, 강관의 표면을 처리하는 단계, 강관의 표면에 본 발명의 실시예들에 따른 강관 코팅용 분체 도료를 제공하여 코팅막을 형성하는 단계, 상기 코팅막을 경화시키는 단계를 포함할 수 있다.Method for coating a steel pipe according to an embodiment of the present invention, the step of treating the surface of the steel pipe, providing a powder coating for steel pipe coating according to embodiments of the present invention on the surface of the steel pipe to form a coating film, the coating film It may comprise the step of curing.

강관의 표면을 처리한다. 강관을 가열하여 표면의 이물질을 제거할 수 있고, 샌딩 처리(sanding treatment)를 할 수 있다. 상기 샌딩 처리는 강관 표면에 도장이 잘 될 수 있도록 도와주는 역할을 할 수 있다.Treat the surface of the steel pipe. The steel pipe can be heated to remove foreign matter from the surface, and sanding treatment can be performed. The sanding treatment may serve to help paint the steel pipe surface well.

강관의 표면에 코팅막을 형성한다. 고주파 열처리 등을 이용하여 강관을 유도 가열하면서 강관 표면에 본 발명의 실시예들에 따른 강관 코팅용 분체 도료를 제공한다. 상기 분체 도료는 강관 표면에서 가열되어 코팅막을 형성한다. 상기 분체 도료를 제공하기 전에 에폭시 수지 분말을 강관 표면에 제공하여 프라이머막을 형성할 수 있다. 예를 들어, 상기 코팅막 및/또는 상기 프라이머막은 유동 침적 도장에 의해 형성될 수 있다. 또는, 상기 코팅막 및/또는 상기 프라이머막은 상기 분체 도료 및/또는 상기 에폭시 수지 분말이 강관 표면에 제공될 때 고전압을 제공하여 정전 도장에 의해 형성될 수 있다. 상기 유동 침적 도장 또는 상기 정전 도장 의해 상기 분체 도료 및/또는 상기 에폭시 수지 분말이 강관 표면에 잘 부착되어 분체 도료 및/또는 상기 에폭시 수지 분말의 소비량을 절감할 수 있고, 상기 코팅막 및/또는 상기 프라이머막이 빠르고 원활하게 형성될 수 있어 코팅 강관의 생산성이 향상될 수 있다.A coating film is formed on the surface of the steel pipe. It provides a powder coating for steel pipe coating according to embodiments of the present invention on the surface of the steel pipe while induction heating the steel pipe using high frequency heat treatment. The powder coating material is heated on the surface of the steel pipe to form a coating film. Prior to providing the powder coating material, an epoxy resin powder may be provided on the surface of the steel pipe to form a primer film. For example, the coating film and / or the primer film may be formed by flow deposition coating. Alternatively, the coating film and / or the primer film may be formed by electrostatic coating by providing a high voltage when the powder paint and / or the epoxy resin powder is provided on the steel pipe surface. The powder coating and / or the epoxy resin powder adhere well to the surface of the steel pipe by the flow deposition coating or the electrostatic coating to reduce the consumption of the powder coating and / or the epoxy resin powder, and the coating film and / or the primer The film can be formed quickly and smoothly so that the productivity of the coated steel pipe can be improved.

상기 코팅막을 가열 건조시켜 경화시킨다. 이에 의해 상기 분체 도료에 의해 코팅된 코팅 강관이 형성된다. 상기 코팅 강관은 물로 세정된 후 전기 검사 등이 수행될 수 있다.The coating film is cured by heating to dryness. This forms a coated steel pipe coated with the powder coating. The coated steel pipe may be washed with water and then subjected to electrical inspection.

이제까지 본 발명에 대한 구체적인 실시예들을 살펴보았다. 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자는 본 발명이 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 변형된 형태로 구현될 수 있음을 이해할 수 있을 것이다. 그러므로 개시된 실시예들은 한정적인 관점이 아니라 설명적인 관심에서 고려 되어야 한다. 본 발명의 범위는 전술한 설명이 아니라 특허청구범위에 나타나 있으며, 그와 동등한 범위 내에 있는 모든 차이점은 본 발명에 포함된 것으로 해석되어야 할 것이다.So far, specific embodiments of the present invention have been described. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive attention rather than in a limiting sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

본 발명의 실시예들에 따른 강관 코팅용 분체 도료는 강관을 코팅하는데 사용될 수 있고, 상기 강관 코팅용 분체 도료에 의해 코팅된 강관은 다양한 환경 조건에서 가스 및 오일의 파이프 라인 등 다양한 설비에 적용될 수 있다.Steel pipe coating powder coating according to embodiments of the present invention can be used to coat the steel pipe, the steel pipe coated by the steel pipe coating powder coating can be applied to a variety of facilities, such as gas and oil pipelines under various environmental conditions have.

Claims (15)

변성 폴리에틸렌 수지; Modified polyethylene resins; 폴리스티렌계 수지; 및 Polystyrene resin; And 접착성 수지를 포함하는 강관 코팅용 분체 도료.Powder coating material for steel pipe coating containing adhesive resin. 제 1 항에 있어서,The method of claim 1, 상기 강관 코팅용 분체 도료의 용융흐름지수(190℃, 2.16kg)는 3 ~ 40g/10분인 것을 특징으로 하는 강관 코팅용 분체 도료.Melt flow index (190 ℃, 2.16kg) of the powder coating material for steel pipe coating powder coating material for steel pipe coating, characterized in that 3 ~ 40g / 10 minutes. 제 1 항에 있어서,The method of claim 1, 상기 변성 폴리에틸렌 수지는, 폴리에틸렌, 고밀도 폴리에틸렌, 저밀도 폴리에틸렌, 및 선형저밀도 폴리에틸렌 중에서 선택된 하나 이상에 무수말레인산을 그라프트시켜 형성된 것을 특징으로 하는 강관 코팅용 분체 도료.The modified polyethylene resin is powder coating for steel pipe coating, characterized in that formed by grafting maleic anhydride to at least one selected from polyethylene, high density polyethylene, low density polyethylene, and linear low density polyethylene. 제 1 항에 있어서,The method of claim 1, 상기 폴리스티렌계 수지는, 범용 폴리스티렌, 고충격 폴리스티렌, 및 폴리스티렌 공중합체 중에서 선택된 하나 이상을 포함하는 것을 특징으로 하는 강관 코팅용 분체 도료.The polystyrene resin is a powder coating material for steel pipe coating, characterized in that it comprises at least one selected from general-purpose polystyrene, high impact polystyrene, and polystyrene copolymer. 제 4 항에 있어서,The method of claim 4, wherein 상기 폴리스티렌 공중합체는, 스티렌-부타디엔 공중합체, 아크릴로니트릴-부타디엔-스티렌 공중합체, 스티렌-부타디엔-스티렌 공중합체, 스티렌-에틸렌-부틸렌-스티렌 공중합체, 및 스티렌-에틸렌-부타디엔-스티렌 공중합체 중에서 선택된 하나 이상을 포함하는 것을 특징으로 하는 강관 코팅용 분체 도료.The polystyrene copolymer is a styrene-butadiene copolymer, an acrylonitrile-butadiene-styrene copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butylene-styrene copolymer, and a styrene-ethylene-butadiene-styrene air Powder coating for steel pipe coating, characterized in that it comprises at least one selected from coalescing. 제 1 항에 있어서,The method of claim 1, 상기 접착성 수지는, 폴리올레핀계 고무, 저밀도폴리에틸렌(LDPE), 선형저밀도폴리에틸렌(LLDPE), 고밀도 폴리에틸렌(HDPE), 에틸렌비닐아세테이트(EVA), 폴리프로필렌(PP), 및 부타디엔러버(BR) 중에서 선택된 하나 이상을 포함하는 것을 특징으로 하는 강관 코팅용 분체 도료.The adhesive resin is selected from polyolefin rubber, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), polypropylene (PP), and butadiene rubber (BR). Powder coating for steel pipe coating, characterized in that it comprises one or more. 제 6 항에 있어서,The method of claim 6, 상기 폴리올레핀계 고무는 에틸렌 옥텐 공중합체, 에틸렌 부텐 공중합체, 에틸렌 프로필렌 공중합체, 에틸렌 프로필렌 디엔 모노머 고무, 및 에틸렌 프로필렌 모노머 고무 중에서 선택된 하나 이상을 포함하는 것을 특징으로 하는 강관 코팅용 분체 도료.The polyolefin rubber is powder coating for steel pipe coating, characterized in that it comprises at least one selected from ethylene octene copolymer, ethylene butene copolymer, ethylene propylene copolymer, ethylene propylene diene monomer rubber, and ethylene propylene monomer rubber. 제 1 항에 있어서,The method of claim 1, 상기 분체 도료 100중량부에 대하여, 상기 변성 폴리에틸렌 수지는 10 ~ 50중량부, 상기 폴리스티렌계 수지는 5 ~ 30중량부, 상기 접착성 수지는 30 ~ 60중량부로 포함되는 것을 특징으로 하는 강관 코팅용 분체 도료. For 100 parts by weight of the powder coating material, the modified polyethylene resin is 10 to 50 parts by weight, the polystyrene-based resin is 5 to 30 parts by weight, the adhesive resin for steel pipe coating, characterized in that it comprises 30 to 60 parts by weight Powder coating. 강관; 및Steel pipe; And 상기 강관 표면에 제공된 코팅막을 포함하고,It includes a coating film provided on the surface of the steel pipe, 상기 코팅막은 제 1 항 내지 제 8 항 중 어느 한 항의 강관 코팅용 분체 도료에 의해 형성된 것을 특징으로 하는 코팅 강관. The coating film is coated steel pipe, characterized in that formed by the powder coating material for steel pipe coating of any one of claims 1 to 8. 제 9 항에 있어서,The method of claim 9, 상기 강관과 상기 코팅막 사이에 제공되는 프라이머막을 더 포함하고,Further comprising a primer film provided between the steel pipe and the coating film, 상기 프라이머막은 에폭시 수지에 의해 형성된 것을 특징으로 하는 코팅 강관.The primer film is coated steel pipe, characterized in that formed by epoxy resin. 강관의 표면을 처리하는 단계;Treating the surface of the steel pipe; 상기 강관의 표면에 제 1 항 내지 제 8 항 중 어느 한 항의 강관 코팅용 분체 도료를 제공하여 코팅막을 형성하는 단계; 및 Forming a coating film by providing a powder coating material for coating the steel pipe of any one of claims 1 to 8 on the surface of the steel pipe; And 상기 코팅막을 경화시키는 단계를 포함하는 강관 코팅 방법.Steel pipe coating method comprising the step of curing the coating film. 제 11 항에 있어서,The method of claim 11, 상기 표면 처리 단계는 가열 공정과 샌딩 처리 공정을 포함하는 것을 특징으로 하는 강관 코팅 방법.The surface treatment step comprises a heating process and a sanding treatment process. 제 11 항에 있어서,The method of claim 11, 상기 코팅막 형성 단계에서, 상기 강관은 유도 가열되는 것을 특징으로 하는 강관 코팅 방법.In the coating film forming step, the steel pipe is a steel pipe coating method characterized in that the induction heating. 제 11 항에 있어서,The method of claim 11, 상기 코팅막은 유동 침적 도장 또는 정전 도장에 의해 형성되는 것을 특징으로 하는 강관 코팅 방법. The coating film is a steel pipe coating method, characterized in that formed by flow deposition coating or electrostatic coating. 제 11 항에 있어서,The method of claim 11, 상기 코팅막 형성 단계는, 상기 강관 코팅용 분체 도료를 제공하기 전에 상기 강관 표면에 에폭시 수지 분말을 제공하여 프라이머막을 형성하는 단계를 포함하는 것을 특징으로 하는 강관 코팅 방법. The coating film forming step, the steel pipe coating method comprising the step of providing a primer film by providing an epoxy resin powder on the surface of the steel pipe before providing the powder coating material for steel pipe coating.
PCT/KR2014/009069 2014-09-28 2014-09-29 Powder coating for steel pipe coating, coated steel pipe, and steel pipe coating method Ceased WO2016047833A1 (en)

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