WO2015145584A1 - Transmission tower coating paint and transmission tower coating method - Google Patents

Transmission tower coating paint and transmission tower coating method Download PDF

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Publication number
WO2015145584A1
WO2015145584A1 PCT/JP2014/058379 JP2014058379W WO2015145584A1 WO 2015145584 A1 WO2015145584 A1 WO 2015145584A1 JP 2014058379 W JP2014058379 W JP 2014058379W WO 2015145584 A1 WO2015145584 A1 WO 2015145584A1
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WIPO (PCT)
Prior art keywords
paint
transmission tower
coating
power transmission
solvent
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PCT/JP2014/058379
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French (fr)
Japanese (ja)
Inventor
政司 仁木
勝男 神光
真輝 笠谷
義高 國武
佳昭 井上
勉 岩見
Original Assignee
中国電力株式会社
中電工業株式会社
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Application filed by 中国電力株式会社, 中電工業株式会社 filed Critical 中国電力株式会社
Priority to PCT/JP2014/058379 priority Critical patent/WO2015145584A1/en
Priority to JP2016509679A priority patent/JP6163605B2/en
Publication of WO2015145584A1 publication Critical patent/WO2015145584A1/en

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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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/302—Water
    • C08G18/307—Atmospheric humidity
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6275—Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6279—Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double bonds containing fluorine atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
    • 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
    • C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • 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
    • 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
    • C09D5/08—Anti-corrosive paints
    • C09D5/12—Wash primers
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/20—Diluents or solvents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers

Definitions

  • the present invention relates to a paint for painting a power transmission tower and a method for painting a power transmission tower.
  • the transmission tower is exposed to wind and rain for a long time. For this reason, galvanization is applied as a rust prevention measure. Since this galvanization deteriorates over time, the antirust effect is maintained by regularly applying antirust coating to the surface of the power transmission tower.
  • This power transmission tower has a height of 30 m or more, and is installed in places where traffic is inconvenient, such as mountainous areas. For this reason, the antirust coating is performed by brushing by an operator.
  • the first is that work is performed at a height of 30 m or higher.
  • the second point is that the work is performed on a thin frame having a width of about 10 cm.
  • the third point is that work is performed by approaching a transmission line charged with tens of thousands to hundreds of thousands of volts. That is, the specifications of the paint for coating are determined in consideration of the fact that the foot is unstable at a high place and a quick work is required.
  • the coating film is required to have long-term weather resistance.
  • it is effective to increase the number of coatings while increasing the thickness of the coating film.
  • the service life is about 5 years.
  • the service life is about 7 to 15 years
  • the service life is 20 to 25 years. It will be about a year.
  • Patent Document 1 discloses a technique in which an undercoat paint is applied to a surface of a galvanized steel structure with a thickness of 80 to 150 ⁇ m, and an overcoat paint is applied with a thickness of 15 to 60 ⁇ m.
  • Patent Document 2 discloses that as an anticorrosive coating used on the surface of a metal structure, the undercoat layer contains a moisture-curable polyurethane urea resin and mica-like iron oxide (or zinc powder), and the layer to be repeatedly applied is a fluororesin.
  • the structure containing is disclosed.
  • Patent Document 3 discloses a method for reforming an outer wall including an intermediate coating process using a urethane resin paint and an overcoating process using a hydrophilic fluororesin.
  • a coating film having a maximum film thickness of 210 ⁇ m can be formed by two coatings on the surface of a steel structure that has been galvanized.
  • this technique focuses only on the relaxation of shrinkage stress, and does not consider any weather resistance. For this reason, the influence when exposed to the outside air for a long period is unknown.
  • the thickness of the coating film per one time exceeds 60 ⁇ m, workability is significantly impaired.
  • the thickness of the undercoat layer is 80 to 150 ⁇ m, it is understood that rapid work is difficult.
  • the rust preventive coating film described in Patent Document 2 has a three-layer structure.
  • the coating film formed by the reforming method described in Patent Document 3 also has a three-layer structure. Therefore, even if the anticorrosion coating film and the remodeling method described in these patent documents are performed, it is understood that a quick operation is difficult.
  • the present invention has been made in view of such circumstances, and an object thereof is to efficiently form a coating film having weather resistance over a long period of time on the surface of a power transmission tower.
  • the present invention provides a paint for a power transmission tower, which is applied to the surface of a galvanized power transmission tower and forms a coating film having weather resistance on the surface of the power transmission tower, An undercoat paint directly applied to the surface of the steel tower; and an overcoat paint applied after the undercoat paint is applied.
  • the undercoat paint contains a moisture-curable polyurethane resin and a first solvent, and is conductive.
  • the top coat paint does not contain a material, and contains a fluororesin and a second solvent.
  • the second solvent has a solubility in the moisture-curable polyurethane resin that is not more than the first solvent.
  • the first solvent is selected from low-boiling aromatic naphtha and xylene
  • the second solvent is selected from mineral spirit and low-boiling aromatic naphtha.
  • this invention is a coating method of the power transmission tower which apply
  • the standard thickness of the coating film with the top coating and the standard thickness of the coating with the undercoating paint be 50 ⁇ m.
  • a coating film having weather resistance over a long period of time can be efficiently formed on the surface of a power transmission tower.
  • a plurality of types of paints for coating having different specifications were prepared and evaluated by combining a pigment component, a conductive material, a moisture curable polyurethane resin, an epoxy resin, and a fluorine resin.
  • the evaluation was performed by a combined cycle test, a cooling / heating cycle test, an accelerated weathering resistance test, and an accelerated weathering / corrosion combined cycle test.
  • the combined cycle test is a test for evaluating the corrosion resistance, water resistance, moisture resistance, and flexibility of the paint.
  • the thermal cycle test is a test for evaluating the flexibility and adhesion stability of the paint.
  • the accelerated weather resistance test is a test for evaluating the weather resistance of the paint.
  • the accelerated weathering / corrosion combined cycle test is a test for evaluating the overall durability. The contents of each test will be described later.
  • the pigment component has a color pigment that determines the color of the paint, and an extender that improves fluidity, strength, optical properties, and the like.
  • a color pigment titanium oxide for white, carbon black for black, ferric oxide for rust color, and yellow iron oxide for yellow were used.
  • extender pigments calcium carbonate, kaolin, diatomaceous earth, talc, barium sulfate, and barium carbonate were used.
  • moisture curable polyurethane resin As shown in FIG. 1, three types of moisture-curable polyurethane resins, A (wet urethane-A) to C (wet urethane-C), were used.
  • the resin component is 58% of the whole, and the rest is the pigment component. That is, it does not contain a conductive material.
  • a moisture curable polyurethane resin having an average molecular weight of 500 to 1500 was used.
  • the solvent low boiling point aromatic naphtha and xylene were used.
  • the paint include trade name “Pine # 8010T” manufactured by Chuden Kogyo Co., Ltd. and trade name “V Grand” manufactured by Dainippon Paint Co., Ltd.
  • Wet and hard urethane-B contains zinc dust as a conductive material.
  • the resin component is 48% of the total, and the rest is the pigment component and the conductive material.
  • As the resin a moisture curable polyurethane resin having an average molecular weight of 500 to 1500 was used.
  • As the solvent low boiling point aromatic naphtha, medium boiling point aromatic naphtha, and trimethylbenzene were used.
  • As this resin for example, trade name “V Grangeink” manufactured by Dainippon Paint Co., Ltd. can be mentioned.
  • Wet and hard urethane-C contains fine aluminum powder having an average particle size of about 35 ⁇ m as an additive. And a resin component is 55% of the whole, and the remainder is a pigment component and an additive.
  • a resin component is 55% of the whole, and the remainder is a pigment component and an additive.
  • a moisture curable polyurethane resin having an average molecular weight of 500 to 1500 was used.
  • the solvent low boiling point aromatic naphtha, medium boiling point aromatic naphtha, and trimethylbenzene were used.
  • the epoxy resin used was three types of epoxy resins A (epoxy-A) to C (epoxy-C) and four types of silicon epoxy.
  • Epoxy-A is composed of 58% of the resin component and the remaining pigment component.
  • a bisphenol A type epoxy resin was used as the main agent, and an HMDI (hexamethylene diisocyanate) type isocyanate resin was used as the curing agent.
  • HMDI hexamethylene diisocyanate
  • the solvent xylene, ethylbenzene, methyl isobutyl ketone, toluene, and ethyl acetate were used.
  • trade name “Epoall # 65-W” manufactured by Dainippon Paint Co., Ltd. can be mentioned.
  • Epoxy-B has a resin component of 54% of the total, and the rest is a pigment component.
  • the resin component a mixture of two types of epoxy resins was used as the main agent.
  • a bisphenol A type epoxy resin having a weight average molecular weight of about 900 and an epoxy equivalent of 450 to 500 was used.
  • a bisphenol A type epoxy resin having a weight average molecular weight of 640 and an epoxy equivalent of about 320 was used.
  • An amine resin made of polyamide amine having an amine value of 60 was used as the curing agent.
  • the solvent xylene, ethylbenzene, methyl isobutyl ketone, and isopropyl alcohol were used.
  • An example of this paint is trade name “Pine # 7011” manufactured by Chuden Kogyo Co., Ltd.
  • Epoxy-C has a resin component of 54% of the total, and the rest is a pigment component.
  • a bisphenol A type epoxy resin was used as the main agent, and an amine resin made of polyamidoamine was used as the curing agent.
  • the solvent toluene, xylene, ethylbenzene, and isobutyl alcohol were used.
  • An example of this paint is trade name “Pine # 9020” manufactured by Chuden Kogyo Co., Ltd.
  • the resin component is 52% of the whole, and the rest is the pigment component.
  • a bisphenol A type epoxy resin and a silicone resin were mixed and used as the main agent.
  • An amine resin made of an aliphatic polyamine was used as the curing agent.
  • the solvent methyl isobutyl ketone, mineral spirit, and isobutyl alcohol were used.
  • An example of this paint is “V Silicon Super” manufactured by Dainippon Paint Co., Ltd.
  • fluororesin As shown in FIG. 3, three types of fluororesins, A (fluorine-A) to C (fluorine-C), were used.
  • Fluorine-A has 74% of the resin component and the rest is the pigment component.
  • a FEVE (fluoroethylene / vinyl ether copolymerization) type fluororesin having a weight average molecular weight of 7000 to 40,000 and an OH number / polymer of 20 to 100 was used as the main component.
  • HMDI type isocyanate resin was used as the curing agent.
  • xylene, ethylbenzene, and butyl acetate were used as the solvent.
  • Fluorine-B also has 74% of the resin component and the rest is the pigment component.
  • a FEVE type fluororesin having a weight average molecular weight of 7000 to 40,000, an OH number / polymer of 20 to 100, and a weak solvent soluble type was used as the main component.
  • HMDI type isocyanate resin was used as the curing agent.
  • mineral spirit which is a weak solvent, and low-boiling aromatic naphtha were used.
  • Examples of the paint include a trade name “Pine # 9030T” manufactured by Chuden Kogyo Co., Ltd., a trade name “Duflon 100 Fine” manufactured by Nippon Paint Co., Ltd., and a trade name “V Freon HB Clean” manufactured by Dainippon Paint Co., Ltd. “Smile”.
  • Fluorine-C has 75% of the resin component and the remaining pigment component.
  • a FEVE type fluororesin having a weight average molecular weight of 7000 to 40,000 and an OH number / polymer of 20 to 100 was used as the main component.
  • HMDI type isocyanate resin was used as the curing agent.
  • xylene, ethylbenzene, and ethyl acetate were used as the solvent.
  • An example of this paint is a trade name “Pine # 9030” manufactured by Chuden Kogyo Co., Ltd.
  • Specification 220-1 consists of three types of undercoat paint, intermediate coat paint, and top coat paint, and is a conventional specification.
  • Epoxy-B was used as the undercoat, and this epoxy-B was applied so that the standard thickness of the coating film was 30 ⁇ m to form an undercoat layer.
  • the standard thickness of a coating film means the design thickness.
  • Epoxy-C was used as the intermediate coating, and this epoxy-C was applied to the undercoat layer so that the standard thickness of the coating film was 30 ⁇ m to form an intermediate coating layer.
  • Fluorine-C was used as the top coating, and this fluorine-C was applied on the intermediate coating layer so that the standard thickness of the coating film was 30 ⁇ m to form a top coating layer.
  • a three-layer coating film having a total film thickness of 90 ⁇ m was formed on the surface of the galvanized steel sheet.
  • Specification 220-2 consists of two types of undercoat paint and topcoat paint, and is a specification of the embodiment.
  • Wet and hard urethane-A was used as the undercoat, and this wet and hard urethane-A was applied so that the standard thickness of the coating film was 50 ⁇ m to form an undercoat layer.
  • Fluorine-A was used as the top coating, and this fluorine-A was applied on the undercoat layer so that the standard thickness of the coating film was 50 ⁇ m to form a top coat layer.
  • a two-layer coating film having a total film thickness of 100 ⁇ m was formed on the surface of the galvanized steel sheet.
  • the specification 220-3 is also composed of two types of undercoat paint and topcoat paint, and is a specification of the embodiment.
  • Wet and hard urethane-A was used as the undercoat, and this wet and hard urethane-A was applied so that the standard thickness of the coating film was 50 ⁇ m to form an undercoat layer.
  • Fluorine-B was used as the top coat, and this fluorine-B was applied on the undercoat layer so that the standard thickness of the coating film was 50 ⁇ m to form a top coat layer.
  • a two-layer coating film having a total film thickness of 100 ⁇ m was formed on the surface of the galvanized steel sheet.
  • Specification 220-4 consists of two types of undercoat and topcoat, and is a comparative example.
  • Wet and hard urethane-A was used as the undercoat, and this wet and hard urethane-A was applied so that the standard thickness of the coating film was 50 ⁇ m to form an undercoat layer.
  • Silicone epoxy was used as the top coating, and this silicon epoxy was applied on top of the undercoat layer so that the standard thickness of the coating film was 80 ⁇ m to form a topcoat layer.
  • a two-layer coating film having a total film thickness of 130 ⁇ m was formed on the surface of the galvanized steel sheet.
  • Specification 220-5 consists of two types of undercoat and topcoat, and is a comparative example.
  • Wet and hard urethane-B was used as the undercoat, and this wet and hard urethane-B was applied so that the standard thickness of the coating film was 50 ⁇ m to form an undercoat layer.
  • Fluorine-B was used as the top coat, and this fluorine-B was applied on the undercoat layer so that the standard thickness of the coating film was 50 ⁇ m to form a top coat layer.
  • a two-layer coating film having a total film thickness of 100 ⁇ m was formed on the surface of the galvanized steel sheet.
  • Specification 220-6 consists of two types of undercoat and topcoat, and is a comparative example.
  • Wet and hard urethane-C was used as the undercoat, and this wet and hard urethane-C was applied so that the standard thickness of the coating film was 50 ⁇ m to form an undercoat layer.
  • Fluorine-B was used as the top coat, and this fluorine-B was applied on the undercoat layer so that the standard thickness of the coating film was 50 ⁇ m to form a top coat layer.
  • a two-layer coating film having a total film thickness of 100 ⁇ m was formed on the surface of the galvanized steel sheet.
  • Specification 220-7 consists of two types of undercoat and topcoat, and is a comparative example.
  • Epoxy-A was used as the undercoating material, and this epoxy-A was applied so that the standard thickness of the coating film was 60 ⁇ m to form an undercoating layer.
  • Fluorine-A was used as the top coating, and this fluorine-A was applied on the undercoat layer so that the standard thickness of the coating film was 50 ⁇ m to form a top coat layer.
  • a coating film having a two-layer structure having a total film thickness of 110 ⁇ m was formed on the surface of the galvanized steel sheet.
  • This combined cycle test is conducted according to JIS K 5600-7-9 “Cycle Test Method”, and an X-shaped notch reaching the substrate is made in the coating film test piece and placed in a corrosion cycle environment to generate rust. And the degree (size) of blisters were evaluated.
  • One cycle in this test is 6H, and the breakdown is as follows. “Salt spray 0.5H” ⁇ “Wet 1.5H” ⁇ “High temperature (50 ° C.) 2H” ⁇ “Dry 2H”.
  • Figure 4 shows the combined cycle test results.
  • symbols ⁇ , ⁇ , ⁇ , and x indicate superiority or inferiority of the results. That is, the symbol ⁇ indicates the best result, the symbol ⁇ indicates the second best result, ⁇ indicates the third best result, and ⁇ indicates the worst result.
  • each symbol has shown the magnitude
  • the size of the inflection of the cut portion is 10 mm (specification 220-5) and 15 mm (specification 220-6) by 1600 cycles, and the durability is insufficient As it seemed, the test after 1600 cycles was discontinued. Further, regarding the specification 220-7 of the comparative example, at the time of 3200 cycles, the size of the swelling of the cut portion was 11 mm, which was larger than the above specifications 220-1 to 220-3.
  • This thermal cycle test is conducted in accordance with JIS K5400 9.3 “Cooling Repeatability”, and the coating specimen is placed in a thermal cycle (expansion / shrinkage cycle) environment to evaluate changes in coating appearance and adhesion stability. did.
  • One cycle in this test is 6H, and the breakdown is “low temperature-20 ° C. 3H” ⁇ “high temperature 50 ° C. 3H”.
  • each symbol shows the number of peeling grids in a cross-cut adhesion test. That is, the number of peeling grids of the coating film cut into a 5 ⁇ 5 grid is shown.
  • the symbol ⁇ indicates that the number of peeling lattices is 0, and the symbol ⁇ indicates that the number of peeling lattices is 1 to 5.
  • the symbol ⁇ indicates that the number of peeling lattices is 6 to 10, and the symbol ⁇ indicates that the number of peeling lattices is 11 or more.
  • the specifications 220-1 to 3 and 5 were all good in that the number of peeling grids was 0 until 1600 cycles, and no cracks or blisters were observed.
  • the number of peeling lattices was 5 in both 200 cycles and 1600 cycles, and the adhesion stability tended to be somewhat low.
  • the number of peeling lattices is as large as 15 to 25, and it is considered that adhesion stability is lacking.
  • This accelerated weather resistance test is conducted in accordance with JIS K 5400 9.8 “Accelerated weather resistance (Sunshine carbon arc lamp type)”. Decomposition), and gloss and color change were evaluated.
  • the test results of the accelerated weather resistance test are shown in FIG. Gloss represents gloss retention (%).
  • the symbol ⁇ indicates that the gloss retention is 100 to 80%, and the symbol ⁇ indicates that the gloss retention is 79 to 60%. Similarly, the symbol ⁇ indicates that the gloss retention is 59 to 35%, and the symbol x indicates that the gloss retention is 34% or less.
  • the color difference indicates ⁇ E.
  • the symbol ⁇ indicates that the color difference is 0.0 to 1.0, and the symbol ⁇ indicates that the color difference is 1.1 to 2.0. Similarly, the symbol ⁇ indicates that the color difference is 2.1 to 3.0, and the symbol x indicates that the color difference is 3.1 or more.
  • Fig. 6 shows the results of the accelerated weathering / corrosion combined cycle test.
  • each symbol shows the number of peeling grids in a cross-cut adhesion test. That is, the number of peeling grids of the coating film cut into a 5 ⁇ 5 grid is shown.
  • the symbol ⁇ indicates that the number of peeling lattices is 0, and the symbol ⁇ indicates that the number of peeling lattices is 1 to 5.
  • the symbol ⁇ indicates that the number of peeling lattices is 6 to 10, and the symbol ⁇ indicates that the number of peeling lattices is 11 or more.
  • FIG. 7 shows an evaluation result obtained by integrating the test results described above. As shown in this figure, it was judged that the specifications 220-2 and 3 were acceptable because it was understood that the weather resistance equivalent to or higher than that of the conventional use could be realized by applying twice. For these specifications 220-2 and 3, test coating was performed in accordance with JIS 5600-7-6 “Outdoor exposure weather resistance”. And it confirmed that it had a required weather resistance by this test coating.
  • the wet urethane-A as the undercoat paint is a moisture-curable polyurethane resin (average molecular weight: 500 to 1500) as a resin component, and a solvent (low-boiling aromatic as a first solvent). Naphtha and xylene) but no conductive material.
  • fluorine-A which is a top coating, contains a fluororesin (combination of FEVE type fluororesin and HMDI type isocyanate resin) and a solvent (xylene, ethylbenzene, and ethyl acetate as the second solvent).
  • fluorine-B which is a top coating, contains a fluororesin (combination of FEVE type fluororesin and HMDI type isocyanate resin) and a solvent (mineral spirit as a second solvent and low boiling aromatic naphtha). It is out.
  • the solvent of the top coat used in the specification 220-3 is a so-called weak solvent, and the solvent power of the moisture curable polyurethane resin is equal to or less than the solvent of the top coat used in the specification 220-2. is there. For this reason, it is excellent in the work efficiency at the time of overcoating top coat.
  • the interval between overcoating of wet and hard urethane-A, which is the undercoat is a minimum time of 18 hours (1 ° C.) to 8 hours (30 ° C.).
  • specifications 220-2 and 3 it is possible to finish with two coats, so the workability is improved in each stage compared to three coats as in the conventional specifications, and the type of paint to be transported Can be reduced. As a result, workability can be greatly improved.
  • the standard thicknesses of the coating films in the undercoat layer and the overcoat layer are both 50 ⁇ m, good workability can be ensured even with a single brush application operation.
  • the specification 220-4 was rejected because the adhesion stability was slightly poor and the weather resistance was poor.
  • the specification 220-5 was rejected because the water resistance (moisture resistance) was poor and the weather resistance was slightly poor.
  • the specifications 220-6 and 7 were rejected because the water resistance (moisture resistance) and weather resistance were poor or somewhat poor.

Abstract

The purpose of the present invention is to efficiently form a coating film that has long-term weather resistance on the surface of a transmission tower. In order to achieve this objective, the present invention is a transmission tower paint that is applied to the surface of a galvanized transmission tower, that forms a weather-resistant coating film on the surface of the transmission tower, and that is characterized by: the provision of a primer paint that is directly applied to the surface of the transmission tower and a top coat paint that is applied on the primer paint after the application thereof; the primer paint comprising a moisture-curable polyurethane resin and a first solvent and not comprising a conductive material; and by the top coat paint comprising a fluorine resin and a second solvent.

Description

送電鉄塔の塗装用塗料、及び、送電鉄塔の塗装方法Paint for painting power transmission tower and method for painting power transmission tower
　本発明は、送電鉄塔の塗装用塗料、及び、送電鉄塔の塗装方法に関する。 The present invention relates to a paint for painting a power transmission tower and a method for painting a power transmission tower.
　送電鉄塔は長期に亘って風雨等に曝される。このため、防錆対策として亜鉛めっきが施されている。この亜鉛めっきが経年劣化をすることから、送電鉄塔の表面に防錆塗装を定期的に行うことで、防錆効果を維持している。この送電鉄塔は、３０ｍ以上の高さを有しており、山間部等の交通が不便な場所にも設置されている。このため、防錆塗装は、作業者による刷毛塗りで行われている。 The transmission tower is exposed to wind and rain for a long time. For this reason, galvanization is applied as a rust prevention measure. Since this galvanization deteriorates over time, the antirust effect is maintained by regularly applying antirust coating to the surface of the power transmission tower. This power transmission tower has a height of 30 m or more, and is installed in places where traffic is inconvenient, such as mountainous areas. For this reason, the antirust coating is performed by brushing by an operator.
　刷毛塗り作業であることから、塗装用塗料の仕様を決める際には、次の点が考慮されている。第１は、高さ３０ｍ以上の高所での作業を行う点である。第２は、幅が１０ｃｍ程度の細いフレームの上で作業を行う点である。第３は、数万ボルトから数十万ボルトで充電された送電線に接近して作業を行う点である。すなわち、塗装用塗料の仕様は、高所で足もとが不安定であり、迅速な作業が求められている点を考慮して決められる。 Since this is a brush painting operation, the following points are taken into consideration when determining the specifications of the paint for painting. The first is that work is performed at a height of 30 m or higher. The second point is that the work is performed on a thin frame having a width of about 10 cm. The third point is that work is performed by approaching a transmission line charged with tens of thousands to hundreds of thousands of volts. That is, the specifications of the paint for coating are determined in consideration of the fact that the foot is unstable at a high place and a quick work is required.
　塗装作業のサイクルをできるだけ長くしたい観点から、塗膜には、長期に亘る耐候性が求められる。塗膜の耐用年数を長くするためには、塗膜を厚くするとともに、塗り回数を増やすことが有効である。例えば、厚さ６０μｍの塗膜を１回塗りで形成した場合、耐用年数は５年程度となる。また、厚さ６０～６５μｍの塗膜を２回塗りで形成した場合、耐用年数は７～１５年程度となり、厚さ９０μｍの塗膜を３回塗りで形成した場合、耐用年数は２０～２５年程度となる。 From the viewpoint of making the cycle of painting work as long as possible, the coating film is required to have long-term weather resistance. In order to increase the service life of the coating film, it is effective to increase the number of coatings while increasing the thickness of the coating film. For example, when a coating film having a thickness of 60 μm is formed by a single coating, the service life is about 5 years. Further, when a coating film having a thickness of 60 to 65 μm is formed by two coatings, the service life is about 7 to 15 years, and when a coating film having a thickness of 90 μm is formed by three coatings, the service life is 20 to 25 years. It will be about a year.
　２０～２５年程度の耐用年数を確保するためには、３回塗りで膜厚が９０μｍの塗膜を形成することが望ましい。しかし、重ね塗りの回数が増えると作業期間が長くなるため、迅速な作業が困難になる。前述したように、足もとが不安定な高所作業であり、付近に送電線が設置されていることから、作業期間が長くなることは好ましくない。 In order to ensure a useful life of about 20 to 25 years, it is desirable to form a coating film having a thickness of 90 μm by three coatings. However, if the number of times of overcoating increases, the work period becomes longer, so that quick work becomes difficult. As described above, it is a work at a high place where the foot is unstable, and since a power transmission line is installed in the vicinity, it is not preferable that the work period becomes long.
　このような事情に鑑み、特許文献１には、亜鉛めっき処理された鋼構造物表面に、下塗り塗料を８０～１５０μｍの厚さで塗布し、上塗り塗料を１５～６０μｍの厚さで塗布する技術が開示されている。また、特許文献２には、金属構造物表面に用いられる防錆塗膜として、下塗り層が湿気硬化型ポリウレタンウレア樹脂、及び雲母状酸化鉄（または亜鉛末）を含み、塗り重ねる層がフッ素樹脂を含む構成が開示されている。さらに、特許文献３には、ウレタン樹脂塗料を用いる中塗り工程と、親水性のフッ素樹脂を用いる上塗り工程とを含む外壁のリフォーム方法が開示されている。 In view of such circumstances, Patent Document 1 discloses a technique in which an undercoat paint is applied to a surface of a galvanized steel structure with a thickness of 80 to 150 μm, and an overcoat paint is applied with a thickness of 15 to 60 μm. Is disclosed. Patent Document 2 discloses that as an anticorrosive coating used on the surface of a metal structure, the undercoat layer contains a moisture-curable polyurethane urea resin and mica-like iron oxide (or zinc powder), and the layer to be repeatedly applied is a fluororesin. The structure containing is disclosed. Further, Patent Document 3 discloses a method for reforming an outer wall including an intermediate coating process using a urethane resin paint and an overcoating process using a hydrophilic fluororesin.
特許第５１５５７２３号公報Japanese Patent No. 5155723 特開平１０－１５７００４号公報JP 10-157004 A 特開２００８－２２３４１７号公報JP 2008-223417 A
　特許文献１に記載された技術によれば、亜鉛めっき処理された鋼構造物表面に対し、最大膜厚が２１０μｍの塗膜を、２回塗りで形成することができる。しかしながら、この技術では、収縮応力の緩和にしか着目しておらず、耐候性について何ら考慮されていない。このため、長期間に亘って外気に曝された際の影響については未知数である。また、刷毛を用いた塗装は、１回あたりの塗膜の厚さが６０μｍを超えてしまうと作業性が著しく損なわれてしまう。この技術では、下塗り層の厚さが８０～１５０μｍであることから、迅速な作業は難しいと解される。 According to the technique described in Patent Document 1, a coating film having a maximum film thickness of 210 μm can be formed by two coatings on the surface of a steel structure that has been galvanized. However, this technique focuses only on the relaxation of shrinkage stress, and does not consider any weather resistance. For this reason, the influence when exposed to the outside air for a long period is unknown. In addition, when using a brush for coating, if the thickness of the coating film per one time exceeds 60 μm, workability is significantly impaired. With this technique, since the thickness of the undercoat layer is 80 to 150 μm, it is understood that rapid work is difficult.
　また、特許文献２に記載された防錆塗膜は３層構造である。同様に、特許文献３に記載されたリフォーム方法で形成される塗膜も３層構造である。従って、これらの特許文献に記載された防錆塗膜やリフォーム方法を行ったとしても、迅速な作業は困難であると解される。加えて、山間部等の交通不便の地に設置された送電鉄塔を塗装する場合、負担軽減の観点から、運搬する塗料の種類をできるだけ少なくすることが望ましい。すなわち、塗料の種類を３種類から２種類に減らせれば、その分だけ作業効率を向上させることができる。 Moreover, the rust preventive coating film described in Patent Document 2 has a three-layer structure. Similarly, the coating film formed by the reforming method described in Patent Document 3 also has a three-layer structure. Therefore, even if the anticorrosion coating film and the remodeling method described in these patent documents are performed, it is understood that a quick operation is difficult. In addition, when painting power transmission towers installed in inconvenient places such as mountainous areas, it is desirable to reduce the number of types of paint to be transported from the viewpoint of reducing the burden. That is, if the number of types of paint can be reduced from three types to two types, work efficiency can be improved accordingly.
　本発明は、このような事情に鑑みてなされたものであり、その目的は、長期間に亘る耐候性を有する塗膜を、送電鉄塔の表面に効率よく形成することにある。 The present invention has been made in view of such circumstances, and an object thereof is to efficiently form a coating film having weather resistance over a long period of time on the surface of a power transmission tower.
　前述の目的を達成するため、本発明は、亜鉛めっきを施した送電鉄塔の表面に塗布され、耐候性を備える塗膜を前記送電鉄塔の表面に形成する送電鉄塔用塗料であって、前記送電鉄塔の表面に直接塗布される下塗り塗料と、前記下塗り塗料の塗布後に重ねて塗布される上塗り塗料とを備え、前記下塗り塗料は、湿気硬化型ポリウレタン樹脂、及び、第１溶剤を含む一方、導電材を含まず、前記上塗り塗料は、フッ素樹脂、及び、第２溶剤を含むことを特徴とする。 In order to achieve the above-described object, the present invention provides a paint for a power transmission tower, which is applied to the surface of a galvanized power transmission tower and forms a coating film having weather resistance on the surface of the power transmission tower, An undercoat paint directly applied to the surface of the steel tower; and an overcoat paint applied after the undercoat paint is applied. The undercoat paint contains a moisture-curable polyurethane resin and a first solvent, and is conductive. The top coat paint does not contain a material, and contains a fluororesin and a second solvent.
　前述の送電鉄塔用塗料において、前記第２溶剤は、前記湿気硬化型ポリウレタン樹脂に対する溶解力が前記第１溶剤以下であることが好ましい。 In the above-mentioned paint for power transmission towers, it is preferable that the second solvent has a solubility in the moisture-curable polyurethane resin that is not more than the first solvent.
　前述の送電鉄塔用塗料において、前記第１溶剤が、低沸点芳香族ナフサ、及び、キシレンから選択され、前記第２溶剤が、ミネラルスピリット、及び、低沸点芳香族ナフサから選択されることが好ましい。 In the paint for a power transmission tower described above, it is preferable that the first solvent is selected from low-boiling aromatic naphtha and xylene, and the second solvent is selected from mineral spirit and low-boiling aromatic naphtha. .
　また、本発明は、請求項１から３の何れか１項に記載の送電鉄塔用塗料を、前記送電鉄塔の表面に塗布する送電鉄塔の塗装方法であって、前記上塗り塗料による塗膜の標準厚さを、前記下塗り塗料による塗膜の標準厚さと同じにすることを特徴とする。 Moreover, this invention is a coating method of the power transmission tower which apply | coats the coating material for power transmission towers in any one of Claim 1 to 3 on the surface of the said power transmission tower, Comprising: The standard of the coating film by the said top coat paint The thickness is the same as the standard thickness of the coating film by the undercoat paint.
　前述の送電鉄塔の塗装方法において、前記上塗り塗料による塗膜の標準厚さ、及び、前記下塗り塗料による塗膜の標準厚さを、５０μｍにすることが好ましい。 In the above-described method for coating a power transmission tower, it is preferable that the standard thickness of the coating film with the top coating and the standard thickness of the coating with the undercoating paint be 50 μm.
　本発明によれば、長期間に亘る耐候性を有する塗膜を、送電鉄塔の表面に効率よく形成することができる。 According to the present invention, a coating film having weather resistance over a long period of time can be efficiently formed on the surface of a power transmission tower.
使用材料（その１）を説明する図である。It is a figure explaining used material (the 1). 使用材料（その２）を説明する図である。It is a figure explaining used material (the 2). 使用材料（その３）を説明する図である。It is a figure explaining used material (the 3). 仕様概要及び複合サイクル試験の結果を示す図である。It is a figure which shows the result of a specification outline | summary and a combined cycle test. 冷熱サイクル試験及び促進耐侯性試験の結果を示す図である。It is a figure which shows the result of a thermal cycle test and an accelerated weathering resistance test. 促進耐侯性・腐食性複合サイクル試験の結果を示す図である。It is a figure which shows the result of an accelerated weathering-corrosion combined cycle test. 評価結果を説明する図である。It is a figure explaining an evaluation result.
　以下、本発明の実施の形態について説明する。本実施形態では、顔料成分と、導電材と、湿気硬化型ポリウレタン樹脂と、エポキシ系樹脂と、フッ素系樹脂とを組み合わせて異なる仕様の塗装用塗料を複数種類作製し、評価を行った。評価は、複合サイクル試験、冷熱サイクル試験、促進耐侯性試験、及び、促進耐侯性・腐食性複合サイクル試験によって行った。 Hereinafter, embodiments of the present invention will be described. In this embodiment, a plurality of types of paints for coating having different specifications were prepared and evaluated by combining a pigment component, a conductive material, a moisture curable polyurethane resin, an epoxy resin, and a fluorine resin. The evaluation was performed by a combined cycle test, a cooling / heating cycle test, an accelerated weathering resistance test, and an accelerated weathering / corrosion combined cycle test.
　これらの試験のうち、複合サイクル試験は、塗料の防食性、耐水性、耐湿性、及び可撓性を評価するための試験である。冷熱サイクル試験は、塗料の可撓性、及び付着安定性を評価するための試験である。促進耐侯試験は、塗料の耐候性を評価するための試験である。促進耐侯性・腐食性複合サイクル試験は、総合的な耐久性を評価するための試験である。なお、各試験の内容については後述する。 Of these tests, the combined cycle test is a test for evaluating the corrosion resistance, water resistance, moisture resistance, and flexibility of the paint. The thermal cycle test is a test for evaluating the flexibility and adhesion stability of the paint. The accelerated weather resistance test is a test for evaluating the weather resistance of the paint. The accelerated weathering / corrosion combined cycle test is a test for evaluating the overall durability. The contents of each test will be described later.
　試験の説明に先立ち、使用材料について説明する。まず、顔料成分について説明する。図１に示すように、顔料成分は、塗料の色を定める着色顔料と、流動性、強度、及び光学的性質等を改善する体質顔料とを有する。着色顔料としては、白色用の酸化チタン、黒色用のカーボンブラック、錆色用の酸化第二鉄、及び黄色用の黄色酸化鉄を用いた。体質顔料としては、炭酸カルシウム、カオリン、珪藻土、タルク、硫酸バリウム、及び炭酸バリウムを用いた。 Prior to the explanation of the test, the materials used will be explained. First, the pigment component will be described. As shown in FIG. 1, the pigment component has a color pigment that determines the color of the paint, and an extender that improves fluidity, strength, optical properties, and the like. As the color pigment, titanium oxide for white, carbon black for black, ferric oxide for rust color, and yellow iron oxide for yellow were used. As extender pigments, calcium carbonate, kaolin, diatomaceous earth, talc, barium sulfate, and barium carbonate were used.
　次に、湿気硬化型ポリウレタン樹脂について説明する。図１に示すように、湿気硬化型ポリウレタン樹脂はＡ（湿硬ウレタン－Ａ）からＣ（湿硬ウレタン－Ｃ）の３種類を用いた。 Next, the moisture curable polyurethane resin will be described. As shown in FIG. 1, three types of moisture-curable polyurethane resins, A (wet urethane-A) to C (wet urethane-C), were used.
　湿硬ウレタン－Ａは、樹脂成分が全体の５８％であり、残りが顔料成分である。すなわち、導電材を含んでいない。樹脂としては、平均分子量が５００～１５００の湿気硬化型ポリウレタン樹脂を用いた。溶剤としては、低沸点芳香族ナフサ、及びキシレンを用いた。この塗料としては、例えば中電工業株式会社製の商品名「パイネ＃８０１０Ｔ」、大日本塗料株式会社製の商品名「Ｖグラン」があげられる。 In the wet and hard urethane-A, the resin component is 58% of the whole, and the rest is the pigment component. That is, it does not contain a conductive material. As the resin, a moisture curable polyurethane resin having an average molecular weight of 500 to 1500 was used. As the solvent, low boiling point aromatic naphtha and xylene were used. Examples of the paint include trade name “Pine # 8010T” manufactured by Chuden Kogyo Co., Ltd. and trade name “V Grand” manufactured by Dainippon Paint Co., Ltd.
　湿硬ウレタン－Ｂは、導電材として亜鉛末を含んでいる。そして、樹脂成分が全体の４８％であり、残りが顔料成分と導電材である。そして、樹脂としては、平均分子量が５００～１５００の湿気硬化型ポリウレタン樹脂を用いた。溶剤としては、低沸点芳香族ナフサ、中沸点芳香族ナフサ、及びトリメチルベンゼンを用いた。この樹脂としては、例えば大日本塗料株式会社製の商品名「Ｖグランジンク」があげられる。 Wet and hard urethane-B contains zinc dust as a conductive material. The resin component is 48% of the total, and the rest is the pigment component and the conductive material. As the resin, a moisture curable polyurethane resin having an average molecular weight of 500 to 1500 was used. As the solvent, low boiling point aromatic naphtha, medium boiling point aromatic naphtha, and trimethylbenzene were used. As this resin, for example, trade name “V Grangeink” manufactured by Dainippon Paint Co., Ltd. can be mentioned.
　湿硬ウレタン－Ｃは、添加材として平均粒子径が約３５μｍのアルミニウム微粉末を含んでいる。そして、樹脂成分が全体の５５％であり、残りが顔料成分と添加材である。そして、樹脂としては、平均分子量が５００～１５００の湿気硬化型ポリウレタン樹脂を用いた。溶剤としては、低沸点芳香族ナフサ、中沸点芳香族ナフサ、及びトリメチルベンゼンを用いた。 Wet and hard urethane-C contains fine aluminum powder having an average particle size of about 35 μm as an additive. And a resin component is 55% of the whole, and the remainder is a pigment component and an additive. As the resin, a moisture curable polyurethane resin having an average molecular weight of 500 to 1500 was used. As the solvent, low boiling point aromatic naphtha, medium boiling point aromatic naphtha, and trimethylbenzene were used.
　次に、エポキシ系樹脂について説明する。図２に示すように、エポキシ系樹脂はエポキシ樹脂Ａ（エポキシ－Ａ）からＣ（エポキシ－Ｃ）の３種類とシリコンエポキシの４種類を用いた。 Next, the epoxy resin will be described. As shown in FIG. 2, the epoxy resin used was three types of epoxy resins A (epoxy-A) to C (epoxy-C) and four types of silicon epoxy.
　エポキシ－Ａは、樹脂成分が全体の５８％であり、残りが顔料成分である。樹脂成分に関し、主剤にビスフェノールＡ型のエポキシ樹脂を用い、硬化剤にＨＭＤＩ（ヘキサメチレンジイソシアネート）型のイソシアネート樹脂を用いた。溶剤としては、キシレン、エチルベンゼン、メチルイソブチルケトン、トルエン、及び酢酸エチルを用いた。この塗料としては、例えば大日本塗料株式会社製の商品名「エポオール＃６５－Ｗ」があげられる。 Epoxy-A is composed of 58% of the resin component and the remaining pigment component. Regarding the resin component, a bisphenol A type epoxy resin was used as the main agent, and an HMDI (hexamethylene diisocyanate) type isocyanate resin was used as the curing agent. As the solvent, xylene, ethylbenzene, methyl isobutyl ketone, toluene, and ethyl acetate were used. As this paint, for example, trade name “Epoall # 65-W” manufactured by Dainippon Paint Co., Ltd. can be mentioned.
　エポキシ－Ｂは、樹脂成分が全体の５４％であり、残りが顔料成分である。樹脂成分に関し、主剤には２種類のエポキシ樹脂を混合して用いた。１つ目の樹脂としては、重量平均分子量が約９００であってエポキシ当量が４５０～５００であるビスフェノールＡ型のエポキシ樹脂を用いた。２つ目の樹脂としては、重量平均分子量が６４０でありエポキシ当量が約３２０であるビスフェノールＡ型のエポキシ樹脂を用いた。硬化剤にはアミン価６０のポリアミドアミンからなるアミン樹脂を用いた。溶剤としては、キシレン、エチルベンゼン、メチルイソブチルケトン、及びイソプロピルアルコールを用いた。この塗料としては、例えば中電工業株式会社製の商品名「パイネ＃７０１１」があげられる。 Epoxy-B has a resin component of 54% of the total, and the rest is a pigment component. Regarding the resin component, a mixture of two types of epoxy resins was used as the main agent. As the first resin, a bisphenol A type epoxy resin having a weight average molecular weight of about 900 and an epoxy equivalent of 450 to 500 was used. As the second resin, a bisphenol A type epoxy resin having a weight average molecular weight of 640 and an epoxy equivalent of about 320 was used. An amine resin made of polyamide amine having an amine value of 60 was used as the curing agent. As the solvent, xylene, ethylbenzene, methyl isobutyl ketone, and isopropyl alcohol were used. An example of this paint is trade name “Pine # 7011” manufactured by Chuden Kogyo Co., Ltd.
　エポキシ－Ｃは、樹脂成分が全体の５４％であり、残りが顔料成分である。樹脂成分に関し、主剤にビスフェノールＡ型のエポキシ樹脂を用い、硬化剤にポリアミドアミンからなるアミン樹脂を用いた。溶剤としては、トルエン、キシレン、エチルベンゼン、及びイソブチルアルコールを用いた。この塗料としては、例えば中電工業株式会社製の商品名「パイネ＃９０２０」があげられる。 Epoxy-C has a resin component of 54% of the total, and the rest is a pigment component. Regarding the resin component, a bisphenol A type epoxy resin was used as the main agent, and an amine resin made of polyamidoamine was used as the curing agent. As the solvent, toluene, xylene, ethylbenzene, and isobutyl alcohol were used. An example of this paint is trade name “Pine # 9020” manufactured by Chuden Kogyo Co., Ltd.
　シリコンエポキシは、樹脂成分が全体の５２％であり、残りが顔料成分である。樹脂成分に関し、主剤にはビスフェノールＡ型のエポキシ樹脂とシリコーン樹脂とを混合して用いた。硬化剤には脂肪族ポリアミンからなるアミン樹脂を用いた。溶剤としては、メチルイソブチルケトン、ミネラルスピリット、及びイソブチルアルコールを用いた。この塗料としては、例えば大日本塗料株式会社製の商品名「Ｖシリコンスーパー」があげられる。 In silicon epoxy, the resin component is 52% of the whole, and the rest is the pigment component. Regarding the resin component, a bisphenol A type epoxy resin and a silicone resin were mixed and used as the main agent. An amine resin made of an aliphatic polyamine was used as the curing agent. As the solvent, methyl isobutyl ketone, mineral spirit, and isobutyl alcohol were used. An example of this paint is “V Silicon Super” manufactured by Dainippon Paint Co., Ltd.
　次に、フッ素樹脂について説明する。図３に示すように、フッ素樹脂はＡ（フッ素－Ａ）からＣ（フッ素－Ｃ）の３種類を用いた。 Next, the fluororesin will be described. As shown in FIG. 3, three types of fluororesins, A (fluorine-A) to C (fluorine-C), were used.
　フッ素－Ａは、樹脂成分が全体の７４％であり、残りが顔料成分である。樹脂成分に関し、主剤に重量平均分子量７０００～４００００であってＯＨ価／ポリマーが２０～１００であるＦＥＶＥ（フルオロエチレン／ビニルエーテル共重合）型のフッ素樹脂を用いた。硬化剤にＨＭＤＩ型のイソシアネート樹脂を用いた。溶剤としては、キシレン、エチルベンゼン、及び酢酸ブチルを用いた。 Fluorine-A has 74% of the resin component and the rest is the pigment component. Regarding the resin component, a FEVE (fluoroethylene / vinyl ether copolymerization) type fluororesin having a weight average molecular weight of 7000 to 40,000 and an OH number / polymer of 20 to 100 was used as the main component. HMDI type isocyanate resin was used as the curing agent. As the solvent, xylene, ethylbenzene, and butyl acetate were used.
　フッ素－Ｂもまた、樹脂成分が全体の７４％であり、残りが顔料成分である。樹脂成分に関し、主剤に重量平均分子量７０００～４００００であってＯＨ価／ポリマーが２０～１００であり、かつ、弱溶剤可溶型であるＦＥＶＥ型のフッ素樹脂を用いた。硬化剤にＨＭＤＩ型のイソシアネート樹脂を用いた。溶剤としては、弱溶剤であるミネラルスピリット、及び低沸点芳香族ナフサを用いた。この塗料としては、例えば中電工業株式会社製の商品名「パイネ＃９０３０Ｔ」、日本ペイント株式会社製の商品名「デュフロン１００ファイン」、及び大日本塗料株式会社製の商品名「ＶフロンＨＢクリーンスマイル」があげられる。 Fluorine-B also has 74% of the resin component and the rest is the pigment component. Regarding the resin component, a FEVE type fluororesin having a weight average molecular weight of 7000 to 40,000, an OH number / polymer of 20 to 100, and a weak solvent soluble type was used as the main component. HMDI type isocyanate resin was used as the curing agent. As the solvent, mineral spirit, which is a weak solvent, and low-boiling aromatic naphtha were used. Examples of the paint include a trade name “Pine # 9030T” manufactured by Chuden Kogyo Co., Ltd., a trade name “Duflon 100 Fine” manufactured by Nippon Paint Co., Ltd., and a trade name “V Freon HB Clean” manufactured by Dainippon Paint Co., Ltd. “Smile”.
　フッ素－Ｃは、樹脂成分が全体の７５％であり、残りが顔料成分である。樹脂成分に関し、主剤に重量平均分子量７０００～４００００であってＯＨ価／ポリマーが２０～１００であるＦＥＶＥ型のフッ素樹脂を用いた。硬化剤にＨＭＤＩ型のイソシアネート樹脂を用いた。溶剤としては、キシレン、エチルベンゼン、及び酢酸エチルを用いた。この塗料としては、例えば中電工業株式会社製の商品名「パイネ＃９０３０」があげられる。 Fluorine-C has 75% of the resin component and the remaining pigment component. Regarding the resin component, a FEVE type fluororesin having a weight average molecular weight of 7000 to 40,000 and an OH number / polymer of 20 to 100 was used as the main component. HMDI type isocyanate resin was used as the curing agent. As the solvent, xylene, ethylbenzene, and ethyl acetate were used. An example of this paint is a trade name “Pine # 9030” manufactured by Chuden Kogyo Co., Ltd.
　そして、図４に示すように、これらの塗料を組み合わせることで、仕様の異なる複数種類の塗料を作成し、亜鉛溶融めっき鋼板の表面に順次塗布して試験片を作成した。以下、各仕様について説明する。 Then, as shown in FIG. 4, by combining these paints, a plurality of types of paints having different specifications were created and applied sequentially to the surface of the galvanized steel sheet to create test pieces. Each specification will be described below.
　仕様２２０－１は、下塗り塗料と中塗り塗料と上塗り塗料の３種類からなり、従来仕様である。下塗り塗料としてはエポキシ－Ｂを用い、このエポキシ－Ｂを塗膜の標準厚さが３０μｍとなるように塗布して下塗り層を形成した。なお、塗膜の標準厚さとは、設計上の厚さを意味する。中塗り塗料としてはエポキシ－Ｃを用い、このエポキシ－Ｃを塗膜の標準厚さが３０μｍとなるように下塗り層に重ねて塗布して中塗り層を形成した。上塗り塗料としてはフッ素－Ｃを用い、このフッ素－Ｃを塗膜の標準厚さが３０μｍとなるように中塗り層に重ねて塗布して上塗り層を形成した。これにより、合計膜厚が９０μｍとなる３層構造の塗膜を、亜鉛溶融めっき鋼板の表面に形成した。 Specification 220-1 consists of three types of undercoat paint, intermediate coat paint, and top coat paint, and is a conventional specification. Epoxy-B was used as the undercoat, and this epoxy-B was applied so that the standard thickness of the coating film was 30 μm to form an undercoat layer. In addition, the standard thickness of a coating film means the design thickness. Epoxy-C was used as the intermediate coating, and this epoxy-C was applied to the undercoat layer so that the standard thickness of the coating film was 30 μm to form an intermediate coating layer. Fluorine-C was used as the top coating, and this fluorine-C was applied on the intermediate coating layer so that the standard thickness of the coating film was 30 μm to form a top coating layer. As a result, a three-layer coating film having a total film thickness of 90 μm was formed on the surface of the galvanized steel sheet.
　仕様２２０－２は、下塗り塗料と上塗り塗料の２種類からなり、実施例の仕様である。下塗り塗料としては湿硬ウレタン－Ａを用い、この湿硬ウレタン－Ａを塗膜の標準厚さが５０μｍとなるように塗布して下塗り層を形成した。上塗り塗料としてはフッ素－Ａを用い、このフッ素－Ａを塗膜の標準厚さが５０μｍとなるように下塗り層に重ねて塗布して上塗り層を形成した。これにより、合計膜厚が１００μｍとなる２層構造の塗膜を、亜鉛溶融めっき鋼板の表面に形成した。 Specification 220-2 consists of two types of undercoat paint and topcoat paint, and is a specification of the embodiment. Wet and hard urethane-A was used as the undercoat, and this wet and hard urethane-A was applied so that the standard thickness of the coating film was 50 μm to form an undercoat layer. Fluorine-A was used as the top coating, and this fluorine-A was applied on the undercoat layer so that the standard thickness of the coating film was 50 μm to form a top coat layer. As a result, a two-layer coating film having a total film thickness of 100 μm was formed on the surface of the galvanized steel sheet.
　仕様２２０－３もまた、下塗り塗料と上塗り塗料の２種類からなり、実施例の仕様である。下塗り塗料としては湿硬ウレタン－Ａを用い、この湿硬ウレタン－Ａを塗膜の標準厚さが５０μｍとなるように塗布して下塗り層を形成した。上塗り塗料としてはフッ素－Ｂを用い、このフッ素－Ｂを塗膜の標準厚さが５０μｍとなるように下塗り層に重ねて塗布して上塗り層を形成した。これにより、合計膜厚が１００μｍとなる２層構造の塗膜を、亜鉛溶融めっき鋼板の表面に形成した。 The specification 220-3 is also composed of two types of undercoat paint and topcoat paint, and is a specification of the embodiment. Wet and hard urethane-A was used as the undercoat, and this wet and hard urethane-A was applied so that the standard thickness of the coating film was 50 μm to form an undercoat layer. Fluorine-B was used as the top coat, and this fluorine-B was applied on the undercoat layer so that the standard thickness of the coating film was 50 μm to form a top coat layer. As a result, a two-layer coating film having a total film thickness of 100 μm was formed on the surface of the galvanized steel sheet.
　仕様２２０－４は、下塗り塗料と上塗り塗料の２種類からなり、比較例の仕様である。下塗り塗料としては湿硬ウレタン－Ａを用い、この湿硬ウレタン－Ａを塗膜の標準厚さが５０μｍとなるように塗布して下塗り層を形成した。上塗り塗料としてはシリコンエポキシを用い、このシリコンエポキシを塗膜の標準厚さが８０μｍとなるように下塗り層に重ねて塗布して上塗り層を形成した。これにより、合計膜厚が１３０μｍとなる２層構造の塗膜を、亜鉛溶融めっき鋼板の表面に形成した。 Specification 220-4 consists of two types of undercoat and topcoat, and is a comparative example. Wet and hard urethane-A was used as the undercoat, and this wet and hard urethane-A was applied so that the standard thickness of the coating film was 50 μm to form an undercoat layer. Silicone epoxy was used as the top coating, and this silicon epoxy was applied on top of the undercoat layer so that the standard thickness of the coating film was 80 μm to form a topcoat layer. As a result, a two-layer coating film having a total film thickness of 130 μm was formed on the surface of the galvanized steel sheet.
　仕様２２０－５は、下塗り塗料と上塗り塗料の２種類からなり、比較例の仕様である。下塗り塗料としては湿硬ウレタン－Ｂを用い、この湿硬ウレタン－Ｂを塗膜の標準厚さが５０μｍとなるように塗布して下塗り層を形成した。上塗り塗料としてはフッ素－Ｂを用い、このフッ素－Ｂを塗膜の標準厚さが５０μｍとなるように下塗り層に重ねて塗布して上塗り層を形成した。これにより、合計膜厚が１００μｍとなる２層構造の塗膜を、亜鉛溶融めっき鋼板の表面に形成した。 Specification 220-5 consists of two types of undercoat and topcoat, and is a comparative example. Wet and hard urethane-B was used as the undercoat, and this wet and hard urethane-B was applied so that the standard thickness of the coating film was 50 μm to form an undercoat layer. Fluorine-B was used as the top coat, and this fluorine-B was applied on the undercoat layer so that the standard thickness of the coating film was 50 μm to form a top coat layer. As a result, a two-layer coating film having a total film thickness of 100 μm was formed on the surface of the galvanized steel sheet.
　仕様２２０－６は、下塗り塗料と上塗り塗料の２種類からなり、比較例の仕様である。下塗り塗料としては湿硬ウレタン－Ｃを用い、この湿硬ウレタン－Ｃを塗膜の標準厚さが５０μｍとなるように塗布して下塗り層を形成した。上塗り塗料としてはフッ素－Ｂを用い、このフッ素－Ｂを塗膜の標準厚さが５０μｍとなるように下塗り層に重ねて塗布して上塗り層を形成した。これにより、合計膜厚が１００μｍとなる２層構造の塗膜を、亜鉛溶融めっき鋼板の表面に形成した。 Specification 220-6 consists of two types of undercoat and topcoat, and is a comparative example. Wet and hard urethane-C was used as the undercoat, and this wet and hard urethane-C was applied so that the standard thickness of the coating film was 50 μm to form an undercoat layer. Fluorine-B was used as the top coat, and this fluorine-B was applied on the undercoat layer so that the standard thickness of the coating film was 50 μm to form a top coat layer. As a result, a two-layer coating film having a total film thickness of 100 μm was formed on the surface of the galvanized steel sheet.
　仕様２２０－７は、下塗り塗料と上塗り塗料の２種類からなり、比較例の仕様である。下塗り塗料としてはエポキシ－Ａを用い、このエポキシ－Ａを塗膜の標準厚さが６０μｍとなるように塗布して下塗り層を形成した。上塗り塗料としてはフッ素－Ａを用い、このフッ素－Ａを塗膜の標準厚さが５０μｍとなるように下塗り層に重ねて塗布して上塗り層を形成した。これにより、合計膜厚が１１０μｍとなる２層構造の塗膜を、亜鉛溶融めっき鋼板の表面に形成した。 Specification 220-7 consists of two types of undercoat and topcoat, and is a comparative example. Epoxy-A was used as the undercoating material, and this epoxy-A was applied so that the standard thickness of the coating film was 60 μm to form an undercoating layer. Fluorine-A was used as the top coating, and this fluorine-A was applied on the undercoat layer so that the standard thickness of the coating film was 50 μm to form a top coat layer. Thereby, a coating film having a two-layer structure having a total film thickness of 110 μm was formed on the surface of the galvanized steel sheet.
　次に、各仕様の試験片による複合サイクル試験について説明する。この複合サイクル試験は、JIS K 5600-7-9「サイクル試験方法」に準拠して行い、塗膜試験片に素地に達するＸ字状の切り込みを入れて、腐食サイクル環境に置き、発生する錆やフクレの程度（大きさ）を評価した。なお、この試験における１サイクルは６Ｈであり、その内訳は次の通りである。「塩水噴霧０．５Ｈ」→「湿潤１．５Ｈ」→「高温（５０℃）２Ｈ」→「乾燥２Ｈ」。 Next, the combined cycle test using test pieces of each specification will be described. This combined cycle test is conducted according to JIS K 5600-7-9 “Cycle Test Method”, and an X-shaped notch reaching the substrate is made in the coating film test piece and placed in a corrosion cycle environment to generate rust. And the degree (size) of blisters were evaluated. One cycle in this test is 6H, and the breakdown is as follows. “Salt spray 0.5H” → “Wet 1.5H” → “High temperature (50 ° C.) 2H” → “Dry 2H”.
　複合サイクル試験の試験結果を図４に示す。同図、及び後述する他の図において、記号◎、○、△、×はそれぞれ結果の優劣を示す。すなわち、記号◎は最もよい結果を、記号○は２番目によい結果を、△は３番目によい結果を、×は最も悪い結果を示している。なお、フクレについて、各記号はフクレの大きさ（幅，直径）を示している。すなわち、記号◎はフクレの大きさが０～４ｍｍであることを、記号○はフクレの大きさが５～８ｍｍあることをそれぞれ示している。同様に、記号△はフクレの大きさが９～１２ｍｍであることを、記号×はフクレの大きさが１３ｍｍ以上であることをそれぞれ示している。 Figure 4 shows the combined cycle test results. In the figure and other figures described later, symbols ◎, ○, Δ, and x indicate superiority or inferiority of the results. That is, the symbol ◎ indicates the best result, the symbol ◯ indicates the second best result, Δ indicates the third best result, and × indicates the worst result. In addition, about a swelling, each symbol has shown the magnitude | size (width | variety, diameter) of a swelling. That is, the symbol ◎ indicates that the size of the bulge is 0 to 4 mm, and the symbol ◯ indicates that the size of the bulge is 5 to 8 mm. Similarly, the symbol Δ indicates that the size of the swelling is 9 to 12 mm, and the symbol × indicates that the size of the swelling is 13 mm or more.
　この複合サイクル試験では、仕様２２０－２～４に関し、１６００サイクルまでの耐久性が従来仕様の仕様２２０－１よりも良好であった。また、２４００サイクル及び３２００サイクルについては、仕様２２０－２～４と仕様２２０－１との間で大きな違いは見られなかった。なお、比較例の仕様２２０－４では、３２００サイクル時点において、切り込み部のフクレの大きさが８ｍｍと他の仕様２２０－１～３よりも僅かに大きかった。 In this combined cycle test, regarding the specifications 220-2 to 4, the durability up to 1600 cycles was better than the specification 220-1 of the conventional specification. In addition, for 2400 cycles and 3200 cycles, there was no significant difference between the specifications 220-2 to 4 and the specifications 220-1. Incidentally, in the specification 220-4 of the comparative example, at the time of 3200 cycles, the size of the swelling of the cut portion was 8 mm, slightly larger than the other specifications 220-1 to 220-3.
　一方、比較例の仕様２２０－５～６については、１６００サイクルまでに切り込み部のフクレの大きさが１０ｍｍ（仕様２２０－５），１５ｍｍ（仕様２２０－６）であり、耐久性が不十分と思われたので、１６００サイクルよりも後の試験は中止した。また、比較例の仕様２２０－７については、３２００サイクル時点において、切り込み部のフクレの大きさが１１ｍｍと前述の仕様２２０－１～３よりも大きかった。 On the other hand, with respect to the specifications 220-5 to 6 of the comparative example, the size of the inflection of the cut portion is 10 mm (specification 220-5) and 15 mm (specification 220-6) by 1600 cycles, and the durability is insufficient As it seemed, the test after 1600 cycles was discontinued. Further, regarding the specification 220-7 of the comparative example, at the time of 3200 cycles, the size of the swelling of the cut portion was 11 mm, which was larger than the above specifications 220-1 to 220-3.
　次に、冷熱サイクル試験について説明する。この冷熱サイクル試験は、JIS K 5400 9.3「耐冷熱繰り返し性」に準拠して行い、塗膜試験片を冷熱サイクル（膨張・収縮サイクル）環境に置き、塗膜外観、付着安定性の変化を評価した。なお、この試験における１サイクルは６Ｈであり、その内訳は「低温－２０℃　３Ｈ」→「高温５０℃　３Ｈ」である。 Next, the thermal cycle test will be described. This thermal cycle test is conducted in accordance with JIS K5400 9.3 “Cooling Repeatability”, and the coating specimen is placed in a thermal cycle (expansion / shrinkage cycle) environment to evaluate changes in coating appearance and adhesion stability. did. One cycle in this test is 6H, and the breakdown is “low temperature-20 ° C. 3H” → “high temperature 50 ° C. 3H”.
　冷熱サイクル試験の試験結果を図５に示す。なお、付着性について、各記号は、クロスカット付着性試験での剥離格子数を示す。すなわち、５×５の格子状にカットされた塗膜の剥離格子数を示している。そして、記号◎は剥離格子数が０個であることを、記号○は剥離格子数が１～５個であることをそれぞれ示している。同様に、記号△は剥離格子数が６～１０個であることを、記号×は剥離格子数が１１個以上であることをそれぞれ示している。 The test result of the thermal cycle test is shown in FIG. In addition, about adhesion, each symbol shows the number of peeling grids in a cross-cut adhesion test. That is, the number of peeling grids of the coating film cut into a 5 × 5 grid is shown. The symbol ◎ indicates that the number of peeling lattices is 0, and the symbol ◯ indicates that the number of peeling lattices is 1 to 5. Similarly, the symbol Δ indicates that the number of peeling lattices is 6 to 10, and the symbol × indicates that the number of peeling lattices is 11 or more.
　この冷熱サイクル試験において、仕様２２０－１～３，５は何れも、１６００サイクルまで剥離格子数が０個であり、かつ、ワレもフクレも確認されず、良好な結果であった。一方、仕様２２０－４は、２００サイクルと１６００サイクルの何れも剥離格子数が５個であり、付着安定性が多少低い傾向が見られた。また、仕様２２０－６，７は何れも、剥離格子数が１５～２５と多く、付着安定性に欠けると考えられる。 In this cooling / heating cycle test, the specifications 220-1 to 3 and 5 were all good in that the number of peeling grids was 0 until 1600 cycles, and no cracks or blisters were observed. On the other hand, in specification 220-4, the number of peeling lattices was 5 in both 200 cycles and 1600 cycles, and the adhesion stability tended to be somewhat low. In addition, in each of the specifications 220-6 and 7, the number of peeling lattices is as large as 15 to 25, and it is considered that adhesion stability is lacking.
　次に、促進耐候性試験について説明する。この促進耐候性試験は、JIS K 5400 9.8「促進耐候性（サンシャインカーボンアーク灯式）」に準拠して行い、塗膜試験片に強力な紫外線を照射し、紫外線による劣化（樹脂・顔料分の分解）を促進し、光沢、色彩変化を評価した。 Next, the accelerated weather resistance test will be described. This accelerated weather resistance test is conducted in accordance with JIS K 5400 9.8 “Accelerated weather resistance (Sunshine carbon arc lamp type)”. Decomposition), and gloss and color change were evaluated.
　促進耐候性試験の試験結果を図５に示す。なお、光沢は光沢保持率（％）を示す。そして、記号◎は光沢保持率が１００～８０％であることを、記号○は光沢保持率が７９～６０％であることをそれぞれ示している。同様に、記号△は光沢保持率が５９～３５％であることを、記号×は光沢保持率が３４％以下であることをそれぞれ示している。また、色差は△Ｅを示す。そして、記号◎は色差が０．０～１．０であることを、記号○は色差が１．１～２．０であることをそれぞれ示している。同様に、記号△は色差が２．１～３．０であることを、記号×は色差が３．１以上であることをそれぞれ示している。 The test results of the accelerated weather resistance test are shown in FIG. Gloss represents gloss retention (%). The symbol ◎ indicates that the gloss retention is 100 to 80%, and the symbol ◯ indicates that the gloss retention is 79 to 60%. Similarly, the symbol Δ indicates that the gloss retention is 59 to 35%, and the symbol x indicates that the gloss retention is 34% or less. Further, the color difference indicates ΔE. The symbol ◎ indicates that the color difference is 0.0 to 1.0, and the symbol ◯ indicates that the color difference is 1.1 to 2.0. Similarly, the symbol Δ indicates that the color difference is 2.1 to 3.0, and the symbol x indicates that the color difference is 3.1 or more.
　この促進耐候性試験において、９０００Ｈまで耐える仕様はなかった。このため、６０００Ｈまでの結果で比較すると、仕様２２０－４については、６０００Ｈでの光沢が低く、紫外線に対する耐性が他の仕様よりも低かった。反対に、仕様２２０－２については、６０００Ｈにおける光沢や色差が他の仕様よりも良好であった。そして、残りの仕様については、大きな違いは見られなかった。 In this accelerated weathering test, there was no specification that could withstand up to 9000H. Therefore, when compared with the results up to 6000H, the spec 220-4 had a low gloss at 6000H and a lower resistance to ultraviolet rays than the other specs. On the contrary, for the specification 220-2, the gloss and color difference at 6000H were better than other specifications. And for the rest of the specification, there were no significant differences.
　次に、促進耐侯性・腐食性複合サイクル試験について説明する。この促進耐侯性・腐食性複合サイクル試験は、実環境を想定した腐食試験環境に塗膜試験片を置き、塗膜外観、付着安定性の変化を評価した。この促進耐侯性・腐食性複合サイクル試験において、１サイクルは２４０Ｈであり、その内訳は、「促進耐候性試験が１２０Ｈ」→「複合サイクル試験が１２０Ｈ（２０サイクル）」である。 Next, the accelerated weathering / corrosion combined cycle test will be described. In this accelerated weathering / corrosion combined cycle test, a coating film specimen was placed in a corrosion test environment assuming an actual environment, and changes in coating film appearance and adhesion stability were evaluated. In this accelerated weathering / corrosive combined cycle test, one cycle is 240H, and the breakdown is “accelerated weather resistance test is 120H” → “combined cycle test is 120H (20 cycles)”.
　促進耐侯性・腐食性複合サイクル試験の試験結果を図６に示す。なお、付着性について、各記号は、クロスカット付着性試験での剥離格子数を示す。すなわち、５×５の格子状にカットされた塗膜の剥離格子数を示している。そして、記号◎は剥離格子数が０個であることを、記号○は剥離格子数が１～５個であることをそれぞれ示している。同様に、記号△は剥離格子数が６～１０個であることを、記号×は剥離格子数が１１個以上であることをそれぞれ示している。 Fig. 6 shows the results of the accelerated weathering / corrosion combined cycle test. In addition, about adhesion, each symbol shows the number of peeling grids in a cross-cut adhesion test. That is, the number of peeling grids of the coating film cut into a 5 × 5 grid is shown. The symbol ◎ indicates that the number of peeling lattices is 0, and the symbol ◯ indicates that the number of peeling lattices is 1 to 5. Similarly, the symbol Δ indicates that the number of peeling lattices is 6 to 10, and the symbol × indicates that the number of peeling lattices is 11 or more.
　この促進耐侯性・腐食性複合サイクル試験において、錆、ワレ、フクレの３項目については、各仕様で優劣はつかなかった。付着安定性については、仕様２２０－２，５が最もよく、仕様２２０－１，３が次によかった。一方、仕様２２０－４については、仕様２２０－１～３，５に比べてやや劣っていた。また、仕様２２０－６，７については、付着安定性が最も悪かった。 In this accelerated weathering / corrosion cycle test, the specifications of the three items of rust, crack, and swelling were not superior or inferior. Regarding adhesion stability, specifications 220-2 and 5 were the best, and specifications 220-1 and 3 were the following. On the other hand, the specification 220-4 was slightly inferior to the specifications 220-1 to 3,5. For specifications 220-6 and 7, adhesion stability was the worst.
　図７は、前述した試験結果を総合した評価結果である。この図に示すように、仕様２２０－２，３については、従来使用と同等以上の耐候性を２回塗りで実現できると解されたので合格と判定した。そして、これらの仕様２２０－２，３については、JIS 5600-7-6「屋外暴露耐候性」に準拠した試験塗装を行った。そして、この試験塗装により、必要な耐候性を有していることを確認した。 FIG. 7 shows an evaluation result obtained by integrating the test results described above. As shown in this figure, it was judged that the specifications 220-2 and 3 were acceptable because it was understood that the weather resistance equivalent to or higher than that of the conventional use could be realized by applying twice. For these specifications 220-2 and 3, test coating was performed in accordance with JIS 5600-7-6 “Outdoor exposure weather resistance”. And it confirmed that it had a required weather resistance by this test coating.
　合格判定の仕様２２０－２において、下塗り塗料である湿硬ウレタン－Ａは、樹脂成分として湿気硬化型ポリウレタン樹脂（平均分子量：５００～１５００）、及び、溶剤（第１溶剤としての低沸点芳香族ナフサ、及びキシレン）を含む一方、導電材は含んでいない。一方、上塗り塗料であるフッ素－Ａは、フッ素樹脂（ＦＥＶＥ型のフッ素樹脂とＨＭＤＩ型のイソシアネート樹脂の組み合わせ）、及び、溶剤（第２溶剤としてのキシレン、エチルベンゼン、及び酢酸エチル）を含んでいる。 In the pass determination specification 220-2, the wet urethane-A as the undercoat paint is a moisture-curable polyurethane resin (average molecular weight: 500 to 1500) as a resin component, and a solvent (low-boiling aromatic as a first solvent). Naphtha and xylene) but no conductive material. On the other hand, fluorine-A, which is a top coating, contains a fluororesin (combination of FEVE type fluororesin and HMDI type isocyanate resin) and a solvent (xylene, ethylbenzene, and ethyl acetate as the second solvent). .
　同じく合格判定の仕様２２０－３において、下塗り塗料である湿硬ウレタン－Ａは、仕様２２０－２と同じである。一方、上塗り塗料であるフッ素－Ｂは、フッ素樹脂（ＦＥＶＥ型のフッ素樹脂とＨＭＤＩ型のイソシアネート樹脂の組み合わせ）、及び、溶剤（第２溶剤としてのミネラルスピリット、及び低沸点芳香族ナフサ）を含んでいる。 Similarly, in the specification 220-3 for the pass judgment, the wet and hard urethane-A as the undercoat is the same as the specification 220-2. On the other hand, fluorine-B, which is a top coating, contains a fluororesin (combination of FEVE type fluororesin and HMDI type isocyanate resin) and a solvent (mineral spirit as a second solvent and low boiling aromatic naphtha). It is out.
　さらに、仕様２２０－３に用いられている上塗り塗料の溶剤はいわゆる弱溶剤であり、仕様２２０－２に用いられている上塗り塗料の溶剤よりも、湿気硬化型ポリウレタン樹脂に対する溶解力が同等以下である。このため、上塗り塗料を重ね塗りする際の作業効率に優れている。 Furthermore, the solvent of the top coat used in the specification 220-3 is a so-called weak solvent, and the solvent power of the moisture curable polyurethane resin is equal to or less than the solvent of the top coat used in the specification 220-2. is there. For this reason, it is excellent in the work efficiency at the time of overcoating top coat.
　加えて、下塗り塗料である湿硬ウレタン－Ａの重ね塗り間隔は、最小時間で１８時間（１℃）～８時間（３０℃）である。そして、仕様２２０－２，３では、２回塗りで仕上げか可能になることから、従来仕様のような３回塗りに比べて作業性が各段に向上するし、運搬対象の塗料の種類を減らすことができる。その結果、作業性の大幅な向上が図れる。加えて、下塗り層と上塗り層における塗膜の標準厚さが、共に５０μｍであることから、１回の刷毛塗り作業であっても良好な作業性を確保できる。 In addition, the interval between overcoating of wet and hard urethane-A, which is the undercoat, is a minimum time of 18 hours (1 ° C.) to 8 hours (30 ° C.). And in specifications 220-2 and 3, it is possible to finish with two coats, so the workability is improved in each stage compared to three coats as in the conventional specifications, and the type of paint to be transported Can be reduced. As a result, workability can be greatly improved. In addition, since the standard thicknesses of the coating films in the undercoat layer and the overcoat layer are both 50 μm, good workability can be ensured even with a single brush application operation.
　一方、仕様２２０－４については、付着安定性がやや不良であったこと、耐候性が不良であったことから不合格となった。同様に、仕様２２０－５については、耐水性（耐湿性）が不良であったこと、耐候性がやや不良であったことから不合格となった。また、仕様２２０－６，７については、耐水性（耐湿性）や耐候性が不良若しくはやや不良であったことから不合格となった。 On the other hand, the specification 220-4 was rejected because the adhesion stability was slightly poor and the weather resistance was poor. Similarly, the specification 220-5 was rejected because the water resistance (moisture resistance) was poor and the weather resistance was slightly poor. The specifications 220-6 and 7 were rejected because the water resistance (moisture resistance) and weather resistance were poor or somewhat poor.
　以上の実施形態の説明は、本発明の理解を容易にするためのものであり、本発明を限定するものではない。本発明はその趣旨を逸脱することなく、変更、改良され得ると共に本発明にはその等価物が含まれる。 The above description of the embodiment is intended to facilitate understanding of the present invention and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

Claims (5)

  1. 　亜鉛めっきを施した送電鉄塔の表面に塗布され、耐候性を備える塗膜を前記送電鉄塔の表面に形成する送電鉄塔用塗料であって、
    　前記送電鉄塔の表面に直接塗布される下塗り塗料と、前記下塗り塗料の塗布後に重ねて塗布される上塗り塗料とを備え、
    　前記下塗り塗料は、湿気硬化型ポリウレタン樹脂、及び、第１溶剤を含む一方、導電材を含まず、
    　前記上塗り塗料は、フッ素樹脂、及び、第２溶剤を含むことを特徴とする送電鉄塔塗料。     A coating for a power transmission tower that is applied to the surface of a power transmission tower that has been galvanized, and that forms a coating with weather resistance on the surface of the power transmission tower.
    An undercoat paint directly applied to the surface of the power transmission tower, and an overcoat paint applied repeatedly after application of the undercoat paint,
    The undercoat paint contains a moisture curable polyurethane resin and a first solvent, but does not contain a conductive material,
    The top coat paint includes a fluororesin and a second solvent.
  2. 　前記第２溶剤は、前記湿気硬化型ポリウレタン樹脂に対する溶解力が前記第１溶剤以下であることを特徴とする請求項１に記載の送電鉄塔用塗料。 The power transmission tower paint according to claim 1, wherein the second solvent has a solubility in the moisture-curable polyurethane resin equal to or less than that of the first solvent.
  3. 　前記第１溶剤が、低沸点芳香族ナフサ、及び、キシレンから選択され、
    　前記第２溶剤が、ミネラルスピリット、及び、低沸点芳香族ナフサから選択されることを特徴とする請求項２に記載の送電鉄塔用塗料。     The first solvent is selected from low boiling aromatic naphtha and xylene;
    The paint for power transmission towers according to claim 2, wherein the second solvent is selected from mineral spirit and low-boiling aromatic naphtha.
  4. 　請求項１から３の何れか１項に記載の送電鉄塔用塗料を、前記送電鉄塔の表面に塗布する送電鉄塔の塗装方法であって、
    　前記上塗り塗料による塗膜の標準厚さを、前記下塗り塗料による塗膜の標準厚さと同じにすることを特徴とする送電鉄塔の塗装方法。     A coating method for a power transmission tower, wherein the paint for a power transmission tower according to any one of claims 1 to 3 is applied to a surface of the power transmission tower,
    A method for coating a power transmission tower, characterized in that a standard thickness of the coating film by the top coating is the same as a standard thickness of the coating by the undercoating.
  5. 　前記上塗り塗料による塗膜の標準厚さ、及び、前記下塗り塗料による塗膜の標準厚さを、５０μｍにすることを特徴とする請求項４に記載の送電鉄塔の塗装方法。 5. The method for coating a power transmission tower according to claim 4, wherein the standard thickness of the coating film by the top coating and the standard thickness of the coating by the base coating are 50 μm.
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