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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/61—Additives non-macromolecular inorganic
• • 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
  • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
• • 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
  • C09D201/00—Coating compositions based on unspecified macromolecular compounds
• • 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
  • C09D5/10—Anti-corrosive paints containing metal dust
• • 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
  • C09D7/40—Additives
  • C09D7/45—Anti-settling agents
• • 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
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/63—Additives non-macromolecular organic
• • 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
  • C09D7/40—Additives
  • C09D7/65—Additives macromolecular

Definitions

• the present invention relates to a paint used to protect a metal surface such as a steel material.
• Zinc rich paint is one of the anticorrosive paints that protects metal materials (mainly steel) from corrosion.
• Zinc rich paint is a paint in which zinc powder is blended in a high concentration (70 wt% or more after the coating film is dried), and is widely used.
• Zinc rich paint has a sacrificial anticorrosion effect on metals nobler than zinc even when the coating film is scratched and the metal of the base material is exposed due to the zinc powder blended in a high concentration.
• zinc ions eluted from the zinc powder in the zinc rich paint form a corrosion product of zinc in the exposed portion to form a protective film.
• the zinc rich paint can form a coating film having an excellent anticorrosion effect due to the sacrificial anticorrosion effect of zinc and the protective film action.
• zinc rich paint has excellent performances such as sacrificial anticorrosion action and protective film action, but after the zinc in the formed coating film is corroded and consumed, the sacrificial anticorrosion action and protective film action The action does not work.
• Non-patent Document 2 discloses that when zinc powder in a coating film corrodes, the voids in the coating film are filled with zinc corrosion products, and the blocking property of corrosion factors such as water, oxygen, and salt is improved.
• this conventional finding is considered to be an event limited to the inorganic zinc rich paint having voids in the initial coating film.
• organic zinc rich paint there are no voids in the initial coating film, and when zinc in the coating film corrodes and changes to a corrosion product, this part becomes a path for corrosion factors such as water, oxygen, and salt, and corrosion. It was confirmed by the research of the inventors that the blocking property of the factor was reduced.
• the zinc rich paint coating film is exposed to the atmosphere, the zinc in the coating film is corroded from the coating film surface toward the inside of the coating film, and the thickness of the healthy part where zinc is not corroded. Is getting thinner.
• the rate of zinc corrosion can be reduced, the progress of zinc corrosion from the surface of the coating film exposed to the atmosphere to the inside of the coating film will be slowed down. It is also possible to reduce the rate at which the zinc inside corrodes and the film thickness of the healthy part of the coating film becomes thinner.
• zinc rich paint containing aluminum or aluminum-magnesium alloy is commercially available.
• zinc-based alloy plating having a lower corrosion rate than zinc plating
• these technologies have problems such as an increase in cost and difficulty in processing (manufacturing) into a particle shape and particle size suitable for zinc rich paint.
• Patent Document 1 describes that when the weight ratio of calcium sulfate to the heating residue of zinc rich paint is 100: 16 or more, the anticorrosion property is lower than that when the weight ratio is 100: 8. .. Further, when the same weight ratio described above is 100: 8, the corrosion resistance is good, but the paint is difficult to apply and the workability is poor.
• the present invention has been made to solve the above problems, and even if a large amount of calcium sulfate is added, calcium sulfate is uniformly dispersed, and a coating material having good corrosion resistance and good workability can be obtained.
• the purpose is to realize it.
• the coating material according to the present invention contains zinc powder, a binder composed of an organic resin, calcium sulfate, and a dispersant, and the content of calcium sulfate is the heating residue of the coating film (the sulfate salt to be added). (Excluding) 0.046 to 0.186 mol with respect to 100 g, the weight ratio of zinc to the dry coating film excluding calcium sulfate is 70 wt%, and the weight ratio of the dispersant to calcium sulfate is 0.05 to 0. It is 5 wt%, and the dispersant is composed of at least one of a block copolymer having a basic group having pigment affinity, an oil-soluble nonionic activator, and a polyether-modified silicone type.
• a dispersant composed of at least one of a block copolymer having a basic group having pigment affinity, an oil-soluble nonionic activator, and a polyether-modified silicone type. Therefore, even if a large amount of calcium sulfate is added, calcium sulfate is uniformly dispersed, and a coating material having good corrosion resistance and good workability can be realized.
• the coating material according to the embodiment is composed of a binder composed of zinc powder and an organic resin as a basic composition, as is well known as a zinc rich coating material.
• the binder can be composed of an epoxy resin.
• this paint contains calcium sulfate and a dispersant.
• the content of calcium sulfate in this coating material is 0.046 to 0.186 mol with respect to 100 g of the heating residue (excluding the sulfate to be added) of the coating film.
• the weight ratio of zinc to the dry coating film excluding calcium sulfate in this paint is 70 wt%.
• the weight ratio of the dispersant to calcium sulfate is 0.05 to 0.5 wt%.
• the dispersant is composed of at least one of a block copolymer having a basic group having pigment affinity, an oil-soluble nonionic surfactant, and a polyether-modified silicone type.
• a block copolymer having a basic group having pigment affinity for example, DISPERBYK-2155 manufactured by BYK, Floren D-90 manufactured by Kyoei Kagaku Co., Ltd., Polyflow KL-401 and the like are preferably used.
• the dispersant is for uniformly dispersing calcium sulfate in the paint.
• Calcium sulfate dihydrate was added to the heating residue of the coating film so as to have a weight ratio of 100: 8, 100: 16, 100: 32, and further, with respect to the weight of calcium sulfate.
• a coating material to which various dispersants were weighed and added so as to be 0.05 to 0.5 wt% of calcium sulfate was applied to a steel plate to prepare a sample.
• the dispersants used in the experiment were DISPERBYK-145, DISPERBYK-180, DISPERBYK-2155 manufactured by BYK, Floren D-90, Polyflow KL-100, Polyflow KL-401, and Polyflow KL-403 manufactured by Kyoeisha Chemical Co., Ltd. Kind.
• the SD zinc 500 mild used in the experiment is an organic zinc rich paint that complies with "JIS K 5533 thick film type zinc rich paint 2 types", so the amount of metallic zinc in the heating residue should be at least 70 wt% or more. be. Generally, the zinc content of the organic zinc rich paint is about 70 to 90 wt%.
• a composite cycle test was conducted in which salt spray, wetting, and drying were repeated for each paint that formed the damaged part of the paint film.
• the NTT type combined cycle test described in Reference 1 was carried out for 2000 hours.
• the sodium chloride aqueous solution used in the technique of Reference 1 does not contain sulfate ions. Therefore, here, in order to accurately evaluate the performance of each coating material, the "new corrosion test solution (pH 5)" described in Reference 3 was used as the test solution instead of the solution described in Reference 1.
• the coating film on the edge of the coating (painting sample) prepared as a sample is thinner than the other parts. Therefore, when calcium sulfate is added to the coating film of the sample portion, the calcium sulfate in the coating film is gradually eluted, and the portion where the calcium sulfate is present becomes a void. Therefore, if there is a portion where calcium sulfate is unevenly present at the edge portion of the coating sample having a thin coating film, red rust is likely to occur. Therefore, it is considered that better results were obtained even with the same amount of calcium sulfate added by uniformly dispersing calcium sulfate by adding the dispersant.
• a dispersant is effective for uniformly dispersing calcium sulfate, but the type (type) of a dispersant that is specifically effective for dispersing calcium sulfate has not been clarified, and it is easy to do so. Cannot be inferred.
• a dispersant highly effective for sulfate dispersion in zinc rich paint was found for the first time.
• the amount of calcium sulfate dihydrate added was 8 to 32 wt% of the weight of the heated residue of the coating film, but this is the amount of the heated residue of the coating film (in terms of molar amount). 0.046 to 0.186 mol of calcium sulfate is added to 100 g of the weight (excluding the sulfate to be added). Therefore, when a sulfate other than calcium sulfate is added to a solvent-based zinc rich paint, the amount added is 0.046 to 0.186 mol with respect to 100 g of the heating residue of the coating film. do.
• DISPERBYK-2155 manufactured by BYK is a block copolymer type having a basic group having pigment affinity
• Floren D-90 manufactured by Kyoeisha Chemical Co., Ltd. is an oil-soluble nonionic surfactant type
• Polyflow KL-401 is a polyether-modified silicone type. As long as it is a dispersant of these types, other products can be preferably used.
• a zinc alloy (zinc alloy) powder in which a small amount of aluminum or magnesium is added to zinc may be used for the purpose of improving corrosion resistance.
• zinc ions are released by corrosion of the zinc alloy in the same way as normal zinc rich paint. Similar effects can be obtained by using the invention.
• a dispersion composed of at least one of a block copolymer having a basic group having pigment affinity, an oil-soluble nonionic activator, and a polyether-modified silicone system. Since the agent is used, even if a large amount of calcium sulfate is added, the calcium sulfate is uniformly dispersed, and a coating material having good corrosion resistance and good workability can be realized.

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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)
• Inorganic Chemistry (AREA)
• Paints Or Removers (AREA)

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Citations (6)

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• 2020
  • 2020-04-06 US US17/913,344 patent/US20230142112A1/en not_active Abandoned
  • 2020-04-06 WO PCT/JP2020/015499 patent/WO2021205504A1/ja not_active Ceased
  • 2020-04-06 JP JP2022513712A patent/JP7447991B2/ja active Active

Patent Citations (6)

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