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WO2016047833A1 - Revêtement en poudre pour tuyau en acier, tuyau en acier revêtu, et procédé de revêtement de tuyau en acier - Google Patents

Revêtement en poudre pour tuyau en acier, tuyau en acier revêtu, et procédé de revêtement de tuyau en acier 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
Authority
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
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English (en)
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
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 TWO H CHEM Ltd filed Critical TWO H CHEM Ltd
Publication of WO2016047833A1 publication Critical patent/WO2016047833A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Cette invention concerne un revêtement en poudre pour tuyau en acier, un tuyau en acier revêtu, et un procédé de revêtement d'un tuyau en acier. Le revêtement en poudre pour tuyau en acier contient une résine polyéthylène modifiée, une résine à base de polyéthylène, et une résine adhésive. Le tube en acier revêtu comprend un tuyau en acier, et un film de revêtement formé sur une surface du tuyau en acier, le film de revêtement étant constitué du revêtement en poudre pour tuyau en acier. Le procédé de revêtement d'un tuyau en acier comprend les étapes suivantes : traiter la surface d'un tuyau en acier ; former un film de revêtement par dépôt du revêtement en poudre pour tuyau en acier sur la surface du tuyau en acier ; et durcir le film de revêtement.
PCT/KR2014/009069 2014-09-28 2014-09-29 Revêtement en poudre pour tuyau en acier, tuyau en acier revêtu, et procédé de revêtement de tuyau en acier Ceased WO2016047833A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0129689 2014-09-28
KR1020140129689A KR101862721B1 (ko) 2014-09-28 2014-09-28 강관 코팅용 분체 도료, 코팅 강관 및 강관 코팅 방법

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WO2016047833A1 true WO2016047833A1 (fr) 2016-03-31

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Cited By (2)

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CN115636998A (zh) * 2022-11-04 2023-01-24 山东东宏管业股份有限公司 一种大口径螺旋钢管用聚乙烯粉末及其制备方法和应用
CN115975471A (zh) * 2022-12-09 2023-04-18 浙江绿环新材料科技有限公司 一种双涂层粉末涂料及其制备方法

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KR102350805B1 (ko) * 2021-05-20 2022-01-14 주식회사 코팅코리아 수도용 강관의 내면 코팅용 개질 폴리에틸렌 분체 수지 조성물

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CN115636998A (zh) * 2022-11-04 2023-01-24 山东东宏管业股份有限公司 一种大口径螺旋钢管用聚乙烯粉末及其制备方法和应用
CN115636998B (zh) * 2022-11-04 2023-08-29 山东东宏管业股份有限公司 一种大口径螺旋钢管用聚乙烯粉末及其制备方法和应用
CN115975471A (zh) * 2022-12-09 2023-04-18 浙江绿环新材料科技有限公司 一种双涂层粉末涂料及其制备方法
CN115975471B (zh) * 2022-12-09 2023-08-08 浙江绿环新材料科技有限公司 一种双涂层粉末涂料及其制备方法

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