WO2018168917A1 - Composition de revêtement en poudre de matériaux, et article revêtu - Google Patents

Composition de revêtement en poudre de matériaux, et article revêtu Download PDF

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Publication number
WO2018168917A1
WO2018168917A1 PCT/JP2018/009939 JP2018009939W WO2018168917A1 WO 2018168917 A1 WO2018168917 A1 WO 2018168917A1 JP 2018009939 W JP2018009939 W JP 2018009939W WO 2018168917 A1 WO2018168917 A1 WO 2018168917A1
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WIPO (PCT)
Prior art keywords
component
composition
powder coating
powder
molecular weight
Prior art date
Application number
PCT/JP2018/009939
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English (en)
Japanese (ja)
Inventor
丹羽　真
佐藤　健史
Original Assignee
東亞合成株式会社
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
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Application filed by 東亞合成株式会社 filed Critical 東亞合成株式会社
Priority to CN201880017790.0A priority Critical patent/CN110418825B/zh
Priority to MX2019010987A priority patent/MX2019010987A/es
Priority to JP2019506072A priority patent/JP7078032B2/ja
Publication of WO2018168917A1 publication Critical patent/WO2018168917A1/fr

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Classifications

    • 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
    • B05D7/24—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 for applying particular liquids or other fluent materials
    • 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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives

Definitions

  • the present invention relates to a powder coating composition and a coated article.
  • Powder coating is a coating that does not contain volatile components such as organic solvents, and forms a coating film by coating and melting only the coating film forming component on the substrate.
  • powder paints can be applied thickly at one time, powders that have not adhered can be recovered and reused, and advantages such as less waste paint are recognized. From the point of rationalization of painting and environmental response, various fields such as construction / building materials field, electrical / communication field, automobile / vehicle field, road material field, water / gas material field, steel furniture field, construction machine / industrial machine field, etc. Widely used in the field of industrial products.
  • Epoxy-based, vinyl chloride-based, polyolefin-based, acrylic-based and polyester-based compositions are known as powder coating compositions, but they have high weather resistance especially in outdoor applications such as construction / building materials and automobile / vehicle fields. Since it is required, polyester is widely used as a paint having a balanced coating film performance.
  • polyester is widely used as a paint having a balanced coating film performance.
  • the demand for weather resistance has been increasing year by year, and there is a need for a powder coating composition that is remarkably superior in weather resistance under harsher conditions.
  • slip resistance in outdoor applications such as the construction / building materials field and the automobile / vehicle field, not only the weather resistance but also the safety of the user and passers-by, it is difficult to slip the coating (hereinafter referred to as “slip resistance”).
  • the 60 ° specular gloss of the coating film must be suppressed to 40% or less (hereinafter referred to as “matte property”), and the smoothness of the coating film from the viewpoint of design, and both physical properties must be satisfied at the same time. It has been.
  • Patent Document 1 discloses a powder coating composition containing a polyester resin having a specific structure and a blocked isocyanate.
  • Patent Document 2 discloses a powder coating composition containing a polyester resin having a specific hydroxyl value, a blocked isocyanate, and a specific surface conditioner having ultraviolet absorbing ability.
  • Patent Document 3 discloses a powder coating composition in which a fluororesin is blended with a polyester resin having a specific melt viscosity. This is because the polyester resin and the fluororesin are separated in the process of forming the coating film, and the polyester layer is placed on the substrate side and the fluororesin layer is placed on the air side. It is done.
  • Patent Document 4 discloses a powder coating composition containing a polyester resin having a specific structure and a blocked isocyanate.
  • Patent Document 5 discloses a powder coating composition containing a hydroxyl group-containing polyester resin, a polyisocyanate and a polyolefin wax.
  • composition described in Patent Document 1 is excellent in weather resistance by the sunshine carbon arc type weather meter test, it is weather resistant under severe conditions close to the spectral distribution of sunlight by the xenon type weather meter test. There was a problem of inferiority.
  • the compositions described in Patent Documents 2 and 3 have a problem that the coating film is excellent in smoothness but inferior in weather resistance by a xenon-type weather meter test.
  • the composition described in Patent Document 4 is excellent in the smoothness and matteness of the coating film, it has a problem that it is inferior in weather resistance according to a xenon-type weather meter test and inferior in slip resistance.
  • the composition described in Patent Document 5 is excellent in the smoothness of the coating film, but does not suggest any weather resistance and is inferior in the slip resistance and matting property of the coating film. As described above, it was difficult to satisfy the weather resistance, anti-slip property, matte property and smoothness at the same time.
  • This invention is made
  • the present inventors have obtained a coating film obtained from a powder coating composition containing a hydroxyl group-containing polyester resin having a specific weight average molecular weight, molecular weight distribution and structure and a blocked isocyanate.
  • a coating film obtained from a powder coating composition containing a hydroxyl group-containing polyester resin having a specific weight average molecular weight, molecular weight distribution and structure and a blocked isocyanate.
  • a powder coating composition containing the following components (A) and (B) as essential components.
  • the cured film can be excellent in weather resistance, slip resistance, matteness and smoothness.
  • the present invention relates to a powder coating composition and a coated article containing the following components (A) and (B) as essential components.
  • Component (A) having a weight average molecular weight of 20,000 to 140,000, a molecular weight distribution of 4.0 to 26, having a dicarboxylic acid compound (hereinafter referred to as “component (a)”) and a secondary hydroxyl group.
  • component (B) component for powder coating
  • the composition, the method for producing the powder coating composition, the coated article and the use will be described.
  • the component (A) has a weight average molecular weight of 20,000 to 140,000, a molecular weight distribution of 4.0 to 26, and a hydroxyl group containing a reaction product of the components (a) and (b) Polyester resin.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • GPC gel permeation chromatography
  • the molecular weight measured by GPC in the present invention means a value measured under the following conditions.
  • ⁇ Detector Differential refractometer (RI detector)
  • Column type cross-linked polystyrene column
  • Column temperature within a range of 25 to 50 ° C.
  • Eluent tetrahydrofuran (hereinafter referred to as “THF”)
  • Mw is 20,000 to 140,000 in terms of improving the weather resistance of the coating film. Furthermore, 30,000 or more are preferable and 40,000 or more are more preferable in that the smoothness of the coating film is excellent particularly in a thick film. Moreover, 100,000 or less is preferable at the point which can make melt viscosity moderately low, and 70,000 or less is more preferable.
  • Mw / Mn is 4.0 to 26 in terms of improving the weather resistance of the coating film. Further, 6.0 or more is preferable, and 8.0 or more is more preferable in that the smoothness of the coating film is particularly excellent in a thick film. Moreover, 20 or less is preferable at the point which can make melt viscosity moderately low, and 15 or less is more preferable at the point which is excellent in the smoothness of a coating film.
  • the hydroxyl value of the component (A) is preferably 10 to 100 mgKOH / g, more preferably 20 to 70 mgKOH / g, from the viewpoint of excellent weather resistance and strength of the coating film.
  • the hydroxyl value means the number of mg of potassium hydroxide equivalent to the hydroxyl group in 1 g of a sample.
  • the acid value of the component (A) is preferably from 0.1 to 10 mgKOH / g, more preferably from 0.1 to 7.0 mgKOH / g, from the viewpoint of excellent weather resistance and strength of the coating film.
  • the acid value means the number of mg of potassium hydroxide equivalent to the carboxyl group in 1 g of the sample.
  • the melt viscosity at 200 ° C. of the component (A) is preferably 50 to 150 dPa ⁇ s, more preferably 70 to 110 dPa ⁇ s, from the viewpoint of excellent smoothness of the coating film.
  • the component (A) can be produced by a known production method using the components (a) and (b) as raw materials. During the reaction, if desired, a small amount of water can be added to form a slurry in order to maintain fluidity in the reaction system at the beginning of the reaction. As the reaction method, either a transesterification reaction or a direct esterification reaction can be applied, and polycondensation can be promoted by a method of reacting while introducing an inert gas under a reduced pressure method or normal pressure. In the above reaction, a known reaction catalyst such as dibutyltin oxide can be used.
  • a component may use only 1 type or may use 2 or more types together.
  • the component (a) is a dicarboxylic acid compound.
  • Specific examples of the component (a) include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, azelaic acid, 1,9-nonanedicarboxylic acid, 1,10-decanedicarboxylic acid, 1,12 -Aliphatic dicarboxylic acid compounds such as dodecanedicarboxylic acid and 1,2-octadecanedicarboxylic acid, alicyclic dicarboxylic acid compounds such as 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and hexahydrophthalic acid, phthalates
  • aromatic dicarboxylic acid compounds are preferable, and isophthalic acid is particularly preferable in terms of improving weather resistance.
  • the content of isophthalic acid is preferably 60 to 100 mol% in the total amount of the dicarboxylic acid compound from the viewpoint that the weather resistance of the coating film can be improved.
  • the content of the component ( réelle) is preferably 40 to 60 mol%, more preferably 45 to 55 mol%, in 100 mol% of the total amount of the components ( réelle) and (b). .
  • the component (b) is an aliphatic polyhydric alcohol having no secondary hydroxyl group.
  • Specific examples of the component (b) include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6 -Divalent alcohols such as hexanediol, 1,10-decanediol, 1,4-cyclohexanedimethanol, neopentyl glycol, spiroglycol and 2-butyl-2-ethyl-1,3-propanediol, trimethylolpropane, etc.
  • tetrahydric alcohols such as pentaerythritol.
  • Neopentyl glycol, trimethylolpropane and 2-butyl-2-ethyl-1,3-propanediol are particularly preferred.
  • neopentyl glycol and trimethylol propane in which the alkyl group directly connected to the quaternary carbon at the ⁇ -position of the hydroxyl group has 3 or less carbon atoms, are preferred in terms of excellent weather resistance.
  • the content of component (b) is preferably 40 to 60 mol%, more preferably 45 to 55 mol%, in a total amount of 100 mol% of component ( réelle) and component (b).
  • the content of the dihydric alcohol is preferably from 30 to 60 mol% in the total amount of 100 mol% of the component ( réelle) and the component (b) in that the melt viscosity can be appropriately lowered.
  • the content of the monohydric alcohol is preferably 0 to 10 mol% in 100 mol% of the total amount of the component ( réelle) and the component (b).
  • Component (B) is a blocked isocyanate compound and is preferably a solid at room temperature.
  • the component (B) is produced by reacting an aliphatic, aromatic and araliphatic polyisocyanate compound with a blocking agent and masking, and can be easily produced by those skilled in the art. It is.
  • polyvalent isocyanate compound examples include hexamethylene diisocyanate, 4,4′-methylenebis (cyclohexyl isocyanate), methylcyclohexane diisocyanate, bis (isocyanatemethyl) cyclohexane, isophorone diisocyanate, dimer acid diisocyanate, lysine diisocyanate, tolylene diisocyanate, Examples thereof include divalent isocyanate compounds such as 4,4′-diphenylmethane isocyanate and xylylene diisocyanate, trimer of hexamethylene diisocyanate, and trivalent isocyanate compounds such as lysine triisocyanate.
  • the blocking agent examples include alcohols such as methanol, ethanol and benzyl alcohol, phenols such as phenol and crezone, lactams such as caprolactam and butyrolactam, oximes such as cyclohexanone, oxime and methyl ethyl ketoxime.
  • alcohols such as methanol, ethanol and benzyl alcohol
  • phenols such as phenol and crezone
  • lactams such as caprolactam and butyrolactam
  • oximes such as cyclohexanone, oxime and methyl ethyl ketoxime.
  • a polyisocyanate compound obtained by reacting an aliphatic, aromatic and araliphatic polyvalent isocyanate compound with a low molecular weight compound having active hydrogen is reacted with a blocking agent for masking. It may be manufactured by this.
  • the low molecular weight compound having active hydrogen examples include water, ethylene glycol, propylene glycol, trimethylolpropane, glycerin, sorbitol, ethylenediamine, ethanolamine, diethanolamine, hexamethylenediamine, and the like, isocyanurate, Examples include uretidione, hydroxyl group-containing low molecular weight polyester, and polycaprolactone.
  • the content of the component (B) is such that the cured film has excellent hardness, heat resistance, moisture resistance and chemical resistance, and the molar ratio of isocyanate groups to hydroxyl groups in the powder coating composition is 0.5 to 1. 5 is preferable, and 0.9 to 1.2 is more preferable.
  • the powder coating composition of the present invention contains the components (A) and (B) as essential components, and various other components may be blended depending on the purpose. it can.
  • the composition for powder coatings of the present invention does not contain a fluororesin in terms of excellent adhesion to the primer layer in the coating (hereinafter, 2-coat coating) on which the primer treatment is performed on the substrate. Is preferred.
  • component (C) wax [hereinafter referred to as “component (C)”. ]
  • Curing catalyst hereinafter referred to as “component (D)”.
  • UV absorber hereinafter referred to as “component (E)”.
  • Hindered amine light stabilizer hereinafter referred to as “component (F)”.
  • Pigment hereinafter referred to as “component (G)”.
  • a leveling agent, a pinhole prevention agent, etc. are mentioned.
  • Component (C) is a wax and can be blended for the purpose of imparting matte properties to the coating film.
  • component (C) examples include synthetic waxes, animal / plant or mineral natural waxes, and the like.
  • the synthetic wax examples include hydrocarbon waxes such as polyethylene wax and polypropylene wax, aliphatic amine wax obtained by the reaction of hydrogenated castor oil and monoethanolamine, long chain alcohols such as palmityl alcohol and stearyl alcohol.
  • hydrocarbon waxes such as polyethylene wax and polypropylene wax
  • aliphatic amine wax obtained by the reaction of hydrogenated castor oil and monoethanolamine
  • long chain alcohols such as palmityl alcohol and stearyl alcohol.
  • Examples include reaction products with acids such as palmitic acid and myristic acid, fatty acid esters such as glycerides of fatty acids, and glycol esters.
  • natural waxes include Japanese wax, carnauba wax, shellac wax and paraffin wax.
  • hydrocarbon waxes are preferable because they can make the coating film excellent in matteness and weather resistance, and polypropylene waxes are more preferable because they can be balanced with anti-slip properties.
  • the melting point of the component (C) is preferably 100 ° C. or higher, more preferably 150 ° C. or higher.
  • the melting point is 100 ° C. or higher, the storage stability of the coating powder is improved, and when it is 150 ° C. or higher, the slip resistance is improved.
  • the content ratio of the component (C) is preferably 1 to 15 parts by mass, more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the total amount of the components (A) and (B).
  • the proportion of the component (C) is 1 part by mass or more, the matte property is excellent, and when it is 15 parts by mass or less, the weather resistance is excellent.
  • composition for powder coatings of this invention contains (D) component further from the point of the ease of hardening or a coating-film physical property.
  • the component (D) is preferably a tin catalyst, and specific examples include tin octylate, tributyltin laurate, dibutyltin dilaurate, and di-normal butyltin malate polymer.
  • a curing catalyst may be used individually by 1 type, and may use 2 or more types together.
  • the content ratio of the component (D) is preferably 0.001 to 10 parts by mass, more preferably 0.01 to 10 parts by mass with respect to 100 parts by mass of the total amount of the components (A) and (B).
  • the proportion of component (D) is 0.001 part by mass or more, the catalytic effect can be sufficiently obtained, and by setting it to 10 parts by mass or less, in the melting and curing process of the composition for powder coating, There is a tendency that the gas such as air entrained therein easily escapes and there is little decrease in heat resistance, weather resistance and water resistance of the cured film caused by the remaining gas.
  • component (E) component is an ultraviolet absorber and can be mix
  • the compound having a molecular weight of 200 to 1,000 is preferable.
  • the molecular weight is 200 or more, it is difficult to volatilize during the melting and curing process of the powder coating composition, and can remain in the cured film.
  • the molecular weight is 1,000 or less, the compatibility with the molten paint is good and the smoothness of the cured film is impaired. Absent.
  • a compound having a melting point of 50 to 150 ° C. is preferable.
  • the melting point is 50 ° C. or more, the smoothness of the coating film is improved, and when the melting point is 150 ° C. or less, the film is easily melted in the melting and curing process and can be present uniformly in the coating film.
  • TINUVIN 326 molecular weight: 315.8, melting point: 139 ° C.
  • TINUVIN 405 molecular weight: 583.8, melting point: 74 to 77 ° C.
  • BASF TINUVIN 460 molecular weight: 629.8, melting point: 93 to 102 ° C.
  • TINUVIN 900 molecular weight: 447.6, melting point: 137 to 141 ° C.
  • TINUVIN 928 molecular weight: 441.6, melting point: 109 to 113 ° C.
  • the content ratio of the component (E) may be appropriately set according to the purpose, and is preferably 0.01 to 5 parts by mass, more preferably 100 parts by mass of the total amount of the components (A) and (B). Is 0.1 to 5 parts by mass.
  • the content ratio is 0.01 parts by mass or more, the light resistance of the cured film can be improved, and when it is 5 parts by mass or less, the strength of the cured film can be improved.
  • Component (F) is a hindered amine light stabilizer and can be blended for the purpose of improving the light resistance of the cured film.
  • the molecular weight of (F) is preferably 300 to 3,000.
  • the molecular weight is 300 or more, it is difficult to volatilize during the melting and curing process of the powder coating composition and can remain in the cured film.
  • the molecular weight is 5,000 or less, the compatibility with the molten paint is good and the smoothness of the cured film is impaired. Absent.
  • the compound having a melting point of 50 to 250 ° C. is preferable.
  • the melting point is 50 ° C. or more, the smoothness of the coating film is improved.
  • the melting point is 250 ° C. or less, the coating film is easily melted during the melting and curing process, and can be present uniformly in the coating film.
  • a commercially available product may be used as the component (F).
  • Examples of commercially available products include ADEKA Corporation ADK STAB LA-52 (molecular weight: 847, melting point:> 65 ° C.), ADK STAB LA-57 (molecular weight: 791, melting point: 125 to 135 ° C.), ADK STAB LA-63P (molecular weight: about 2,000, melting point: 85 to 105 ° C.), ADK STAB LA-68 (molecular weight: 1,900, melting point: 80 to 110 ° C.), TINUVIN 144 (BASF) Molecular weight: 685, melting point: 146-150 ° C.), TINUVIN 152 (molecular weight: 756.6, melting point: 83-90 ° C.), Clariant's Sanduvor 3051 powder (molecular weight: 364.0, melting point: 225 ° C.), Clariant's “Sanduvor 3070 powder” (Molecular weight: 1,500, melting point: 148 °
  • the content ratio of the component (F) may be appropriately set according to the purpose, and is preferably 0.01 to 5 parts by mass, more preferably 100 parts by mass with respect to the total amount of the component (A) and the component (B). Is 0.1 to 5 parts by mass.
  • the content ratio is 0.01 parts by mass or more, the light resistance of the cured film can be improved, and when it is 5 parts by mass or less, the strength of the cured film can be improved.
  • Component (G) The component (G) is a pigment and can be blended for various purposes.
  • component (G) examples include coloring pigments, extender pigments, rust preventive pigments, and bright pigments.
  • the color pigment is a pigment for coloring the coating film.
  • Specific examples of the color pigment include carbon black, titanium oxide, iron oxide, bengara, phthalocyanine blue, phthalocyanine green, quinacridone, isoindolinone, benzimidazolone and dioxazine.
  • the extender pigment is a pigment for improving the hardness of the coating film and increasing the thickness of the coating film. Moreover, it is preferable to mix
  • Specific examples of the extender include silica powder, mica, calcium carbonate, barium sulfate, barium carbonate, calcium carbonate, clay, diatomaceous earth, talc, basic magnesium carbonate, and alumina.
  • the rust preventive pigment is a pigment for preventing the base material from corroding or deteriorating with respect to the base material that requires rust prevention.
  • Specific examples of rust preventive pigments include condensed calcium phosphate, aluminum phosphate, condensed aluminum phosphate, zinc phosphate, aluminum phosphite, zinc phosphite, calcium phosphite, zinc molybdate, calcium molybdate, and manganese molybdate. Is mentioned.
  • the bright pigment is a pigment for brightening the coating film.
  • Specific examples of bright pigments include aluminum powder, nickel powder, stainless steel powder, copper powder, bronze powder, gold powder, silver powder, mica powder, graphite powder, glass flakes, scaly iron oxide powder, and flaky plastic pigment. Can be mentioned.
  • These pigments can be contained alone or in combination of two or more.
  • the content ratio of the component (G) may be appropriately set according to the purpose, and is preferably 0 to 200 parts by mass, more preferably 0 with respect to 100 parts by mass of the total amount of the components (A) and (B). ⁇ 100 parts by mass.
  • the powder coating composition of the present invention can be produced by a known method.
  • Method (3) is preferable in that each component is uniformly distributed in the obtained powder, and thus the resulting cured film is excellent in homogeneity.
  • Mixing of raw materials in a solid state can be performed using a mixer such as a high-speed mixer, a V-type mixer, and an inversion mixer.
  • a mixer such as a high-speed mixer, a V-type mixer, and an inversion mixer.
  • Melt-kneading can be performed using various types of extruders such as single-shaft, twin-shaft, and planetary gears.
  • the mixture of each component is kneaded in a heated and melted state, and each component is made uniform. It is preferable to cool the extruded melt-kneaded product to pellets.
  • the pulverization of the pellets can be performed using a pulverizer such as a pin mill, a hammer mill and a jet mill. After pulverization, it is preferable to use a cyclone and a classifier (vibrating sieve, etc.) to make the particle size range uniform (hereinafter referred to as “classification”). When performing classification, it is preferable to remove at least one of particles having a diameter of less than 10 ⁇ m and particles having a diameter of more than 100 ⁇ m.
  • Coated Article The coated article of the present invention has a cured film formed from the composition for powder coating on the surface of the substrate.
  • Examples of the material of the base material include metal plates such as iron plates, steel plates and aluminum plates, and those obtained by surface treatment.
  • the shape and size of the substrate are not particularly limited.
  • the base material In order to improve the adhesion between the base material and the cured film, or to improve the corrosion resistance, it may be a two-coat coating having a primer layer between the base material and the coating film.
  • a primer layer As the primer, various kinds of paints mainly composed of at least one selected from an acrylic resin, a polyester resin, and an epoxy resin can be used as appropriate.
  • the thickness of the primer layer is preferably 1 to 60 ⁇ m, and more preferably 5 to 30 ⁇ m.
  • the coated article of the present invention is obtained by coating the powder coating composition of the present invention on a base material to form a coating film made of a melt of the composition on the base material. It is preferable to produce by reacting, and then cooling and solidifying the molten coating film to room temperature.
  • a melt film composed of a melt of the composition for powder coating may be formed simultaneously with the coating of the composition on the base material, and after the powder of the composition is adhered to the base material, The powder may be formed by heating and melting.
  • the composition Since the curing reaction of the reactive components in the composition starts almost simultaneously with the composition for powder coating being heated and melted, the composition is heated and melted and adhered to the substrate almost simultaneously, or the composition It is necessary to heat and melt the composition after adhesion of the product to the substrate.
  • the composition for powder coating is heated and melted, and the heating temperature (hereinafter also referred to as “baking temperature”) for maintaining the molten state for a predetermined time and the heating maintenance time (hereinafter referred to as “baking time”) are also described. ) Is appropriately set according to the type and composition of the raw material components of the powder coating composition, the desired thickness of the cured film, and the like.
  • the baking temperature is preferably about 170 to 210 ° C.
  • the baking time is preferably 1 to 120 minutes, more preferably 5 to 60 minutes.
  • Examples of the coating method include electrostatic coating, electrostatic spraying, electrostatic dipping, spraying, fluidized dipping, spraying, spraying, spraying, and plasma spraying.
  • the electrostatic coating method using a powder coating gun is preferable from the viewpoint of excellent surface smoothness of the molten film and excellent concealability of the coating film.
  • ⁇ Powder coating guns include corona charging type coating gun and friction charging type coating gun.
  • the corona electrification type coating gun sprays powder paint after corona discharge treatment.
  • the friction charging type coating gun sprays a powder coating after friction charging.
  • the discharge rate of the powder paint from the powder coating gun is preferably 50 to 200 g / min.
  • the distance from the tip of the gun portion of the powder coating gun to the substrate is preferably 100 to 400 mm from the viewpoint of coating efficiency.
  • the load voltage applied to the components constituting the powder coating by corona discharge treatment is preferably ⁇ 20 to ⁇ 100 kV, and the coating efficiency (the ratio at which the powder coating adheres to the substrate) From the viewpoint of excellent appearance of the coating film, ⁇ 50 to ⁇ 80 kV is preferable.
  • the internally generated current value of the powder coating by the frictional charging treatment is preferably 1 to 8 ⁇ A from the viewpoint of excellent coating efficiency and appearance of the coating film.
  • an uncoated base material is installed and a grounded conductive horizontal belt conveyor for grounding is laid in the coating room, Install a gun at the top of the painting chamber.
  • the coating pattern width is preferably 50 to 500 mm
  • the operation speed of the gun is preferably 1 to 30 m / min
  • the conveyor speed is preferably 1 to 50 m / min, and conditions suitable for the purpose may be selected from the above range.
  • Painted articles formed from the composition for powder coatings of the present invention are used in the construction / building materials field, electrical / communication field, automobile / vehicle field, road material field, water / gas material field, steel furniture field and construction machinery. -It can be used in various industrial product fields such as the industrial machinery field. In particular, examples of preferable applications include outdoor applications such as the construction / building materials field and the automobile / vehicle field.
  • Examples of applications in the construction and building materials field include roofs, fences, gates, handrails, face grids, residential steel frames, shutters, curtain walls, partitions, gutter fittings, and reinforcing bars.
  • Examples of applications in the electrical / communication field include solar cell backsheets, solar power collector mirror backside paint wind power blades, range, range hood, air conditioner, refrigerator, washing machine, heater, sewing machine, refrigeration showcase Lighting fixtures, switchboards, generators, motors and telephones.
  • Examples of applications in the automobile / vehicle field include bodies, wipers, bumpers, springs, wheels, brake drums, brake pads, oil filters, engine blocks, roof rails, drive shafts, truck bed parts, and train interior poles.
  • Examples of applications in the road material field include guard rails, guard pipes, bridge railings, balustrades, sign poles and traffic lights.
  • Examples of applications in the water and gas materials field include steel pipes, cast iron pipes, deformed pipes, nipples, gate valves, joints, gas water heaters and faucet fittings.
  • Examples of applications in the steel furniture field include desks, chairs, display shelves, bookshelves, lockers, commercial wagons and beds.
  • Examples of applications in the construction machinery and industrial machinery fields include power shovels, forklifts, FA equipment, machine tools, cylinders, and agricultural machinery.
  • Examples of applications in other fields include medical equipment, developing machines, precision equipment, IT equipment, office equipment, fire extinguishers, gardening supplies, etc.
  • (b ′) component aliphatic polyhydric alcohols (hereinafter referred to as “(b ′) component”) other than the ( réelle) component, (b) component, and (b) component of the used hydroxyl-containing polyester resin. ), Mw, Mw / Mn, hydroxyl value, acid value and melt viscosity.
  • acetic anhydride is added to the sample as an acetylating reagent, and the sample is heated in a warm bath at 92 ° C for 1 hour. After standing to cool, a small amount of water is added and heat-treated in a warm bath at 92 ° C. for 10 minutes. After cooling, acetic acid was back titrated with a potassium hydroxide ethanol solution using a phenolphthalein solution as an indicator to determine the hydroxyl value.
  • brackets in Table 1 mean mol%.
  • the numbers in the components (A) to (G) in Table 2 mean parts by mass. Moreover, the symbol in Table 2 means the following.
  • B1530 isophorone diisocyanate adduct ⁇ -caprolactam block body
  • VESTAGON B1530 manufactured by Evonik Degussa Japan CF970 Polypropylene wax (melting point: 160 ° C.)
  • BYK CERAFLOUR970 AH3 high-density polyethylene wax (melting point 114 ° C.)
  • TI460 2,4-bis (2-hydroxy-4-butoxyphenyl) -6- (2,4-dibutoxyphenyl) -1,3,5-triazine (molecular weight 629.8, melting point: 93 to 102 ° C. ), TINUVIN460 manufactured by BASF LA63P: high molecular weight hindered amine light stabilizer (molecular weight of about 2,000, melting point: 85-105 ° C.), ADEKA ADK STAB LA-63P -Heavy coal A: Heavy calcium carbonate, Maruo calcium Co., Ltd. heavy calcium carbonate A ⁇ 20L: Carbon Black, Orion Engineered Carbons High Black 20L
  • composition for powder coating of the present invention is excellent in all of the physical properties of the cured film such as weather resistance, anti-slip property, matte property and smoothness. It was a thing.
  • compositions of Comparative Examples 1 and 2 are compositions containing a hydroxyl group-containing polyester resin composed of an aliphatic polyhydric alcohol other than the component (b), compared with the compositions of the examples. The weather resistance of the cured film was very poor.
  • the present invention relates to a composition for powder coating and a coated article, and relates to a building / building material field, an electric / communication field, an automobile / vehicle field, a road material field, a water / gas material field, a steel furniture field, and a construction machine / industrial machine. It can be used in various industrial product fields such as fields, and can be preferably used particularly for outdoor applications such as the construction / building materials field and the automobile / vehicle field.

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

Abstract

La présente invention concerne une composition de revêtement en poudre de matériaux, qui permet d'atteindre un film durci présentant d'excellentes résistance aux intempéries, propriétés anti-glissement, propriétés de matification et lissé. La présente invention concerne une composition de revêtement en poudre de matériaux, qui contient les constituants (A) et (B) décrits ci-dessous comme ingrédients essentiels. Constituant (A) : une résine de polyester contenant le groupe hydroxyle qui présente un poids moléculaire moyen en poids de 20 000 à 140 000 et une distribution de poids moléculaires de 4,0 à 26, tout en contenant un produit réactionnel d'un constituant composé acide dicarboxylique (a) et d'un constituant alcool polyhydrique aliphatique (b) qui ne présente pas de groupe hydroxyle secondaire constituant (B) : un composé isocyanate bloqué
PCT/JP2018/009939 2017-03-14 2018-03-14 Composition de revêtement en poudre de matériaux, et article revêtu WO2018168917A1 (fr)

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CN201880017790.0A CN110418825B (zh) 2017-03-14 2018-03-14 粉体涂料用组合物和涂装物品
MX2019010987A MX2019010987A (es) 2017-03-14 2018-03-14 Composicion para materiales de recubrimiento en polvo y articulo recubierto.
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CN112708322B (zh) * 2020-12-11 2021-12-07 广东西敦千江粉漆科学研究有限公司 一种防滑粉末涂料及其制备方法和喷涂工艺

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MX2019010987A (es) 2019-12-09

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