WO2009090827A1 - ポリビニルアセタール系粉体塗料 - Google Patents
ポリビニルアセタール系粉体塗料 Download PDFInfo
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- WO2009090827A1 WO2009090827A1 PCT/JP2008/073009 JP2008073009W WO2009090827A1 WO 2009090827 A1 WO2009090827 A1 WO 2009090827A1 JP 2008073009 W JP2008073009 W JP 2008073009W WO 2009090827 A1 WO2009090827 A1 WO 2009090827A1
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- WIPO (PCT)
- Prior art keywords
- polyvinyl acetal
- powder coating
- powder
- acetal resin
- coating material
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
- C09D5/036—Stabilisers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
-
- 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
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/48—Stabilisers against degradation by oxygen, light or heat
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/005—Stabilisers against oxidation, heat, light, ozone
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
Definitions
- the present invention relates to a polyvinyl acetal powder coating.
- the present invention also relates to a coating film obtained by coating a polyvinyl acetal powder coating material.
- the present invention further relates to a cart coated with a polyvinyl acetal powder coating.
- resins such as polyethylene, polyamide, epoxy resin, and polyvinyl chloride have been used as powder coating resins to protect metal substrates from rust and solvents.
- organic solvent-based paints have been avoided from the viewpoint of environmental impact, and the conversion to non-solvent-based paints has been accelerated.
- Water-based painting can not make the use of organic solvents zero, and there are difficulties in painting workability, and the problem of wastewater treatment remains.
- powder coating is expected from the standpoints of not using any solvent, improving production speed, and reducing costs.
- polyamide-based powder coatings are highly evaluated for their excellent impact resistance, but their adhesion to the substrate is insufficient, and the metal surface is coated with a primer before coating. Need to be processed. There is also a drawback that the hardness of the coating film is inferior.
- a polyvinyl acetal-based powder coating has been developed as a powder coating that can form a coating film having good adhesion to a substrate and high impact resistance and hardness.
- a powder coating material comprising a hydrophobic resin (polyvinyl butyral, etc.) and a water-absorbing resin (polyacrylate, etc.).
- the polyvinyl acetal-based powder coating as described above cannot always be said to have good smoothness when the base temperature is low, and may cause coating defects such as pinholes. For this reason, heating may be performed as needed after coating, but if the heating conditions are long or high, the resin may deteriorate and cause yellowing of the coating film.
- MFR melt flow rate
- the final shape of the base material may be complicated, and in some cases, the base material after painting may be bent to assemble the base material after painting. Under the present circumstances, when the bending resistance of a coating film is inferior, a crack and peeling may arise in a bending site
- the present invention solves the above-described problems of the prior art, and forms a coating film that is excellent in the smoothness of the coating film surface, hardly yellows by heating, and suitable for processing such as bending of a coated object.
- An object of the present invention is to provide a polyvinyl acetal powder coating that can be used.
- Another object of the present invention is to provide a coating film of a polyvinyl acetal powder coating that is excellent in smoothness, hardly shows yellowing, and has excellent bending resistance.
- a further object of the present invention is to provide a cart having excellent smoothness of the coating film, almost no pinholes and yellowing, no cracks or the like in the bent portion, and a good appearance.
- the present invention which has achieved the above object, comprises a polyvinyl acetal resin containing a polyvinyl acetal resin and an antioxidant having a molecular weight of 380 to 1000 and a melting point of 80 to 230 ° C. of 0.02 to 5% by weight based on the polyvinyl acetal resin. It is a powder paint.
- the present invention is also a coating film obtained by coating the polyvinyl acetal powder coating.
- the present invention is a cart coated with the polyvinyl acetal powder coating.
- the powder coating of the present invention has excellent coating surface smoothness with few coating defects such as coating dripping and pinholes caused by high temperature coating and prolonged post-heating. Moreover, yellowing hardly occurs in the coating film in a wide coating temperature range regardless of whether the temperature is high or low. Furthermore, since the coating film is excellent in bending resistance, even if the substrate is processed after coating, cracking and peeling are unlikely to occur.
- the coating film obtained by coating with the powder coating of the present invention is excellent in smoothness, hardly yellowed, and excellent in bending resistance.
- the cart coated with the powder paint of the present invention is excellent in the smoothness of the coating film, hardly shows pinholes and yellowing, is hardly cracked or peeled off at the bent portion, and has a good appearance.
- the polyvinyl acetal resin contains an antioxidant in an amount of 0.02 to 5% by weight based on the resin.
- the content of the antioxidant is less than 0.02% by weight, the bending resistance of the coating film is lowered as is apparent from the comparative examples described later.
- the preferred content of antioxidant is 0.05 to 3% by weight.
- the antioxidant is also an antioxidant having a molecular weight of 380 to 1000 and a melting point of 80 to 230 ° C., in order to achieve the object of the present invention.
- an antioxidant having a molecular weight of 380 or more the bending resistance is further improved, the coating film is less likely to be cracked or peeled off, the fluidity at the time of melting of the resin is improved, and the smoothness is further improved. improves.
- the lower limit of the molecular weight is preferably 400 or more, and more preferably 600 or more.
- the upper limit of the molecular weight of the antioxidant used in the present invention is 1000 or less. And is preferably 800 or less. Further, by using an antioxidant having a melting point of 80 to 230 ° C., the bending resistance is further improved, the smoothness is further improved, and yellowing is less likely to occur. Moreover, it becomes possible to dry blend with polyvinyl acetal resin, and manufacture at low cost is possible compared with melt kneading.
- the melting point of the antioxidant is preferably 90 to 180 ° C.
- hexamethylene bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (IRGANOX 259 manufactured by Ciba Specialty Chemicals), 3 , 9-bis ⁇ 1,1-dimethyl-2- [ ⁇ - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl ⁇ 2,4,8,10-tetraoxaspiro [5 , 5] -Undecane (Adeka Stub AO-80 manufactured by Adeka), N, N′-hexane-1,6-diylbis [3- (3,5-di-t-butyl-4-hydroxyphenylpropionamide)] ( Ciba Specialty Chemicals IRGANOX 1098), 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-ki Rylmethyl) -1,3,5-triazine-2,4,6- (1H
- the antioxidant is preferably a compound represented by the following general formula (1) from the viewpoint of chemical structure.
- R1 to R8 each represent a linear or branched alkyl group having 1 to 4 carbon atoms or a hydrogen atom, and l, m, and n each represent an integer of 1 to 10.
- X represents a heteroatom of N or O.
- Examples of the linear or branched alkyl group having 1 to 4 carbon atoms include methyl, ethyl, propyl, i-propyl, n-butyl, i-butyl, t-butyl and the like.
- IRGANOX 1098 hexamethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]
- Ciba Specialty Chemicals IRGANOX 1098 hexamethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]
- Ciba Specialty Chemicals IRGANOX 1098 hexamethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]
- N, N-dioctadecylhydroxylamine (Ciba Specialty Chemicals, IRGASTAB FS 042) and other hydroxylamine processing heat stabilizers, dioctadecyl-3,3′-thiodipropionate (Ciba Specialty Chemicals) IRGANOX made S 802) and other heat-resistant stabilizers, pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (IRGANOX 1010 manufactured by Ciba Specialty Chemicals), triethylene glycol Bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate (IRGANOX 245 manufactured by Ciba Specialty Chemicals), 3,3 ', 3 ", 5,5', 5" -hexa -T-butyl- ⁇ , ⁇ ', ⁇ "-(mesitylene-2,4,6-tolyl
- the antioxidant preferably has an average particle size of 150 ⁇ m or less and a maximum particle size of 250 ⁇ m or less in order to achieve the object of the present invention.
- the average particle diameter of the antioxidant is preferably 130 ⁇ m or less, more preferably 100 ⁇ m or less.
- the antioxidant can be made into a desired particle size by, for example, pulverizing granules and pellets.
- the average particle size and the maximum particle size of the antioxidant are determined in the same manner as the average particle size and the maximum particle size of the aggregated particles of the polyvinyl acetal resin described later.
- the polyvinyl acetal resin used in the present invention is more preferably a polyvinyl acetal resin having a water content of 2.5% by weight or less and an aldehyde content of 1000 ppm by weight or less in order to more suitably achieve the object of the present invention. It is.
- the smoothness of the coating film obtained by applying the powder paint of the present invention is further improved.
- a more preferable water content is 2% by weight or less.
- the lower limit is preferably 0.1% by weight or more, and more preferably 0.5% by weight or more. Examples of the method for adjusting the water content to such a range include a method of removing the water content to a specified value or less by drying after washing with water after acetalization or a mixed solution of water / alcohol. .
- the content of the remaining aldehyde is 1000 ppm by weight or less, the occurrence of pinholes in the coating film obtained by applying the powder coating of the present invention is reduced, and further yellowing can be further prevented. it can.
- the residual aldehyde content is more preferably 500 ppm by weight or less, and still more preferably 120 ppm by weight or less.
- the lower limit is 5 ppm by weight or more, and more preferably 10 ppm by weight or more.
- Examples of a method for adjusting the aldehyde content to such a range include a method in which polyvinyl acetal is purified by a washing operation with water or a mixed solution of water / alcohol to remove the aldehyde amount to a specified value or less. Can be mentioned.
- the polyvinyl acetal resin used in the present invention is usually produced using a vinyl alcohol polymer as a raw material.
- the vinyl alcohol polymer can be obtained by a conventionally known method, that is, by polymerizing a vinyl ester monomer and saponifying the obtained polymer.
- a conventionally known method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method, and an emulsion polymerization method can be applied.
- As the polymerization initiator an azo initiator, a peroxide initiator, a redox initiator, or the like is appropriately selected depending on the polymerization method.
- a conventionally known alcoholysis or hydrolysis using an alkali catalyst or an acid catalyst can be applied.
- a saponification reaction using methanol as a solvent and a caustic soda (NaOH) catalyst is simple and most preferable.
- vinyl ester monomers examples include vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl versatate, vinyl caproate, vinyl caprylate, vinyl laurate, and palmitic acid.
- vinyl, vinyl stearate, vinyl oleate, vinyl benzoate and the like can be mentioned, with vinyl acetate being particularly preferred.
- the vinyl ester monomer when polymerized, it can be copolymerized with other monomers within a range not impairing the gist of the present invention.
- other monomers include, for example, ⁇ -olefins such as ethylene, propylene, n-butene and isobutylene; acrylic acid and its salts; methyl acrylate, ethyl acrylate, n-propyl acrylate, i-acrylate Acrylic acid esters such as propyl, n-butyl acrylate, i-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, octadecyl acrylate; methacrylic acid and salts thereof; methyl methacrylate, Methacrylic acid such as ethyl methacrylate, n-propyl methacrylate, i-propyl methacrylate, n-but
- the acid catalyst used for acetalization is not particularly limited, and any of organic acids and inorganic acids can be used. Examples thereof include acetic acid, paratoluenesulfonic acid, nitric acid, sulfuric acid, hydrochloric acid and the like. Among these, hydrochloric acid, sulfuric acid, and nitric acid are preferably used, and hydrochloric acid is particularly preferably used.
- a polyvinyl acetal resin obtained by acetalizing a vinyl alcohol polymer (particularly polyvinyl alcohol) with an aldehyde having 2 to 6 carbon atoms examples include acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde, 2-ethylbutyraldehyde, and the like. The above may be used in combination. Among these, aldehydes having 4 to 6 carbon atoms, particularly n-butyraldehyde are preferably used.
- a polyvinyl acetal resin using an aldehyde having 2 to 6 carbon atoms, particularly an aldehyde having 4 to 6 carbon atoms, particularly a polyvinyl butyral resin using n-butyraldehyde is preferable.
- the degree of acetalization of the polyvinyl acetal resin used in the present invention is preferably 40 to 85 mol%, and more preferably 50 to 85 mol%. When the degree of acetalization is within this range, a powder coating having excellent fluidity, uniform coating thickness, and excellent adhesion to the substrate can be obtained.
- the vinyl acetal resin preferably has a vinyl ester unit content of 0.1 to 30 mol% and a vinyl alcohol unit content of 10 to 50 mol%. It is.
- the value of the said acetalization degree, vinyl ester unit content, and vinyl alcohol unit content is a value with respect to the total amount of acetalization degree (vinyl acetal unit content), vinyl ester unit content, and vinyl alcohol unit content. is there.
- the polymerization degree of the vinyl alcohol polymer used as a raw material for the polyvinyl acetal resin used in the present invention is appropriately selected from the range of 150 to 2,000.
- a suitable degree of polymerization of the vinyl alcohol polymer is 200 to 1700, and more preferably 250 to 1000.
- the polyvinyl acetal resin used in the present invention may contain a functional group such as a carboxyl group, a primary hydroxyl group, an epoxy group, an amino group, or an isocyanate group in the molecule.
- a functional group such as a carboxyl group, a primary hydroxyl group, an epoxy group, an amino group, or an isocyanate group in the molecule.
- numerator For example, (1) ethylenically unsaturated monomer which has carboxyl groups or primary hydroxyl groups, such as (meth) acrylic acid and hydroxyethyl (meth) acrylate
- carboxyl group-containing vinyl alcohol polymer or amino group-containing vinyl alcohol polymer examples thereof include a method for acetalizing a coalescence, and (3) a method for acetalizing a vinyl alcohol polymer with an aldehyde compound having a carboxyl group such as glyoxylic acid.
- the polyvinyl acetal resin used in the present invention is preferably in the form of aggregated particles of primary particles, and the primary particles have an average particle size of 5 ⁇ m or less and a maximum particle size of 10 ⁇ m or less. Is preferred.
- the aggregated particles preferably have an average particle size of 150 ⁇ m or less and a maximum particle size of 250 ⁇ m or less.
- the average particle diameter of the aggregated particles is preferably 130 ⁇ m or less, and more preferably 100 ⁇ m or less.
- the primary particles are particles that are first generated in the acetalization reaction of the vinyl alcohol polymer.
- the powder coating obtained can be provided with excellent adhesion to the substrate and high coating film hardness, Further, it is preferable because it can provide further excellent fluidity and a more uniform coating thickness.
- the average particle diameter of the aggregated particles of the polyvinyl acetal resin can be determined by measurement by a laser diffraction method, and examples of an apparatus that can be used for the measurement include a particle size distribution measuring apparatus SALD2200 manufactured by Shimadzu Corporation. Further, the maximum particle size of the aggregated particles can be obtained from the end point value of the particle size distribution obtained by the same measurement.
- the average particle diameter of the primary particles was measured with a scanning electron microscope (SEM) at a magnification of 1000 at three (three) polyvinyl acetal resin photographs, and the primary particle diameter that could be determined from each photograph was measured. (50 points or more per photograph) and the average value may be obtained.
- the diameter of each primary particle measures a major axis.
- the maximum primary particle size is the maximum primary particle size observed from the SEM photograph.
- the polyvinyl acetal resin having such a specific primary particle size and aggregate particle size can be obtained, for example, by the following method.
- an aqueous solution of vinyl alcohol polymer having a concentration of 3 to 15% by weight was adjusted to 80 to 100 ° C., and gradually decreased in temperature to ⁇ 10 to 30 ° C. over 10 to 60 minutes.
- the catalyst was added and the reaction was continued for 30 to 200 minutes while keeping the temperature constant.
- the temperature was further raised to 40 to 80 ° C. over 30 to 200 minutes, held for 1 to 3 hours, cooled, and further washed with water.
- the target polyvinyl acetal resin is obtained by adding a neutralizer (alkali etc.) and drying.
- a neutralizer alkali etc.
- the powder coating material of the present invention can be obtained by dry blending an antioxidant with the polyvinyl acetal resin, or by mixing and melting an antioxidant with the polyvinyl acetal resin and then pulverizing it. From the viewpoint of production cost, the powder coating material of the present invention is preferably one in which a polyvinyl acetal resin and an antioxidant are dry blended.
- the powder coating of the present invention may further contain inorganic fine particles, improve the fluidity of the powder coating, improve the flowability into details, the adhesion to the substrate, and the coating film hardness. Therefore, this is a preferred embodiment.
- inorganic fine particles include silica and aluminum oxide.
- the inorganic fine particles preferably have an average particle size of 1 ⁇ m or less in order to achieve the object of the present invention.
- the average particle size of the inorganic fine particles is preferably 0.5 ⁇ m or less, more preferably 0.1 ⁇ m or less.
- the inorganic fine particles can be pulverized into a desired particle diameter.
- the average particle diameter of the inorganic fine particles is determined by the same method as the average particle diameter of the aggregated particles of the polyvinyl acetal resin.
- the inorganic fine particles are preferably added in an amount of 0.0001 to 2% by weight, more preferably 0.001 to 1% by weight, based on the polyvinyl acetal resin.
- a leveling agent and a surface conditioner such as an antifoaming agent may be blended into the fine powder coating, the adhesion to the substrate, and the occurrence of pinholes and defects.
- a surface conditioner include polymer additives such as acrylic, vinyl, silicone, and fluorine, and benzoin.
- the surface conditioner preferably has an average particle size of 150 ⁇ m or less and a maximum particle size of 250 ⁇ m or less.
- the average particle diameter is preferably 130 ⁇ m or less, and more preferably 100 ⁇ m or less, in order to achieve the object of the present invention.
- the surface conditioner can, for example, pulverize granules to obtain a desired particle size.
- the average particle size and the maximum particle size of the surface modifier are determined by the same method as the average particle size and the maximum particle size of the aggregated particles of the polyvinyl acetal resin.
- the surface conditioner is preferably added in an amount of 0.001 to 10% by weight, more preferably 0.01 to 5% by weight, based on the polyvinyl acetal resin.
- an ultraviolet absorber and the like can be appropriately blended.
- the powder coating material of the present invention may contain a curing agent such as an isocyanate compound, an epoxy compound, a hydroxyalkylamide, an amino compound, an aliphatic dibasic acid, or an acid anhydride.
- a curing agent such as an isocyanate compound, an epoxy compound, a hydroxyalkylamide, an amino compound, an aliphatic dibasic acid, or an acid anhydride.
- the amount of the curing agent used is usually 20% by weight or less, preferably 15% by weight or less, more preferably 10% by weight or less based on the polyvinyl acetal resin.
- the isocyanate compound is not particularly limited, but a blocked isophorone diisocyanate compound is preferably used.
- ⁇ -caprolactam blocked isophorone diisocyanate blocked with a blocking agent such as ⁇ -caprolactam, or a self-blocking type is used.
- Uretodione-bonded isocyanate is preferred.
- Examples of such ⁇ -caprolactam blocked isophorone diisocyanate include “Vestagon B1530” manufactured by Huls, “Clelan (registered trademark) U-1” manufactured by Bayer.
- uretdione-bonded isocyanate include “Vestagon BF1540” manufactured by Huls.
- the epoxy compound is not particularly limited as long as it is an epoxy group-containing compound, but triglycidyl isocyanurate or the like is used.
- Hydroxyalkylamide can be obtained, for example, by reacting a carboxylic acid and / or a carboxylic acid ester with ⁇ -hydroxyalkylamine in the presence of an alkoxide such as sodium or potassium.
- carboxylic acid and carboxylic acid ester include succinic acid, adipic acid, glutaric acid, dimethyl succinate, diethyl succinate, dimethyl adipate, and the like.
- the ⁇ -hydroxyalkylamine include N-methylethanolamine, diethanolamine, N-methylpropanolamine and the like.
- the hydroxyalkylamide include “Primid” series manufactured by EMS-PRIMD.
- the amino compound is not particularly limited as long as it is a compound containing an amino group, but urea, melamine, urea resin and the like are generally used.
- the aliphatic dibasic acid is not particularly limited, but dodecanedioic acid is generally used.
- the acid anhydride is not particularly limited, but trimellitic anhydride, pyromellitic anhydride, etc. are generally used.
- the powder coating of the present invention has excellent coating surface smoothness with few coating defects such as coating dripping and pinholes caused by high temperature coating and prolonged post-heating. Moreover, yellowing hardly occurs in the coating film in a wide coating temperature range regardless of whether the temperature is high or low. Furthermore, since the coating film is excellent in bending resistance, even if the substrate is processed after coating, cracking and peeling are unlikely to occur.
- the powder coating of the present invention also has the original properties of polyvinyl acetal powder coating, that is, good adhesion to the substrate, high hardness and impact resistance of the coating film, and pretreatment with a primer or the like. do not need.
- the powder paint of the present invention can be used in various powder coating methods.
- the powder coating method include a fluid dipping method, an electrostatic coating method, and a thermal spraying method.
- the coating temperature condition varies depending on the coating method and the degree of polymerization of the polyvinyl acetal used, but is preferably about 100 to 400 ° C.
- the coating film obtained by applying the powder paint of the present invention is excellent in smoothness, hardly yellowed, and excellent in bending resistance. Moreover, it has high hardness and impact resistance.
- Examples of the base material to be coated with the polyvinyl acetal powder coating of the present invention include metals such as steel pipes and steel plates. In general, when powder coating is applied to these metals, pretreatment such as degreasing, phosphate treatment, plating, and epoxy resin is applied to improve adhesion to the coating film, corrosion resistance, appearance, etc. Implemented as needed.
- the powder coating of the present invention can also be used for painting ceramics, ceramics, glass, plastics and the like.
- coated by powder coating on the base material represented by a metal as mentioned above a coating film can also be made into a multilayered structure. At this time, it is also possible to perform multilayering with other resin layers as necessary.
- the method of multilayering is not particularly limited, but a method of performing powder coating a plurality of times, a mixture of the powder coating of the present invention and another resin is melted and phase-separated by a difference in affinity, and can be applied by a single coating. Examples thereof include a method of obtaining two or more resin layers. Among these, the method of performing powder coating a plurality of times is preferable because it is not necessary to consider the affinity between resins.
- the final products to be coated with the polyvinyl acetal powder coating of the present invention include carts (eg, shopping carts, basket stands, carts, airport carts, etc., especially shopping carts), water pipes, metal baskets. , Tanks for chemicals, overcoats for home appliances, and automobile parts. Of these, carts are preferred.
- the cart coated with the polyvinyl acetal powder coating of the present invention has excellent coating smoothness, almost no pinholes and yellowing, and is hardly cracked or peeled off at the bent part, and has a good appearance. is there. In addition, the hardness and impact resistance of the coating film on the cart are excellent.
- the cart may be assembled using a steel pipe coated with the powder coating material, and the cart is dipped on the powder coating material to coat the coating film. May be formed.
- the particle diameters of the polyvinyl acetal resin and the antioxidant were measured according to the following method.
- the particle size distribution was measured with a particle size distribution analyzer SALD2200 manufactured by Shimadzu Corporation.
- SALD2200 particle size distribution analyzer
- the particle size distribution was measured with a particle size distribution analyzer SALD2200 manufactured by Shimadzu Corporation.
- SALD2200 Average particle diameter of primary particles of polyvinyl acetal resin
- SALD2200 scanning electron microscope
- three photographs (three sheets) of polyvinyl acetal resin were taken at a magnification of 1000, and the primary particle diameter that could be determined from each photograph was measured (50 or more photographs per photograph). The average value was obtained.
- the diameter of each primary particle measured the major axis.
- Maximum particle size of primary particles of polyvinyl acetal resin The largest primary particle observed from the SEM photograph was measured.
- Example 1 Preparation of polyvinyl acetal resin
- a glass container having an internal volume of 2 liters equipped with a reflux condenser, a thermometer, and a squid type stirring blade
- 1295 g of ion-exchanged water and 105 g of polyvinyl alcohol PVA-1: polymerization degree 600, saponification degree 98 mol%) are placed.
- the whole was heated to 95 ° C. to completely dissolve the polyvinyl alcohol, thereby forming an aqueous polyvinyl alcohol solution (concentration 7.5% by weight).
- the formed polyvinyl alcohol aqueous solution was gradually cooled to 10 ° C. over about 30 minutes while continuing to stir at a rotational speed of 120 rpm.
- butyraldehyde and a concentration of 20 as an acid catalyst as a butyralization catalyst were added to the aqueous solution.
- the butyralization of polyvinyl alcohol was started by adding 90 ml of hydrochloric acid of weight%. After butyralization was performed for 150 minutes, the whole was heated to 50 ° C. over 60 minutes, held at 50 ° C. for 120 minutes, and then cooled to room temperature. After filtering the resin precipitated by cooling, it was washed with ion exchange water (100 times the amount of ion exchange water with respect to the resin), then added with 0.3 wt% sodium hydroxide solution for neutralization, and at 40 ° C.
- the resulting polyvinyl butyral resin (PVB-1) had a butyralization degree of 68 mol%, a vinyl ester unit content of 2 mol%, and a vinyl alcohol unit content of 30 mol%.
- the moisture content of PVB-1 was 0.7%, and the remaining butyraldehyde content was 80 ppm by weight.
- the polyvinyl butyral resin (PVB-1) produced as described above is sieved using a wire mesh of 60 mesh (aperture 250 ⁇ m) to remove powder having a particle diameter of 250 ⁇ m or more, and polyvinyl butyral powder ( A-1) was obtained.
- the average particle diameter of primary particles in the powder (A-1) was 3.5 ⁇ m, and the average particle diameter (aggregated particles) of the powder (A-1) was 80 ⁇ m.
- Antioxidant “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; hexamethylenebis [3- (3,5) with respect to 100 parts of the powder (A-1) obtained above 0.5 parts of (di-t-butyl-4-hydroxyphenyl) propionate] (melting point: 104 ° C.-108 ° C., molecular weight: 639) was added and mixed by a drive render to obtain powder coating material 1.
- the substrate made of the iron plate is preheated (temperature 300 ° C., 10 minutes), suspended in the fluidized layer of the powder coating 1, taken out after 10 seconds, and heated at 230 ° C. for 10 minutes. A painted product was obtained.
- Evaluation of the coating film of the obtained paint was performed according to the following method. The results are shown in Table 1. Regarding the yellowing and smoothness of the coating film, the adhesion state of the powder coating applied to the 0.2 mm (thickness) x 50 mm x 100 mm iron plate is visually observed, and the bending resistance is 5 mm in diameter x 20 cm in length to the iron bar. After coating in the same manner as above, the substrate was bent using a vise after confirming that it was sufficiently cooled, and the coating film at the bent portion was visually evaluated according to the following criteria.
- Example 2 A polyvinyl butyral resin (PVB-2) was obtained in the same manner as in Example 1 except that polyvinyl alcohol (PVA-2: polymerization degree 300, saponification degree 95 mol%) was used instead of PVA-1.
- the degree of butyralization of PVB-2 was 75 mol%, the content of vinyl ester units was 5 mol%, and the content of vinyl alcohol units was 20 mol%.
- the moisture content of PVB-2 was 0.8%, and the residual butyraldehyde content was 100 ppm by weight.
- Example 2 the obtained PVB-2 was sieved in the same manner as in Example 1 to remove the powder having a particle size of 250 ⁇ m or more to obtain a polyvinyl butyral powder (A-2).
- the average particle diameter of primary particles in the powder (A-2) was 3.2 ⁇ m, and the average particle diameter (aggregate particles) of the powder (A-2) was 60 ⁇ m.
- a powder coating material 2 was obtained in the same manner as in Example 1 except that the powder (A-2) prepared above was used instead of the powder (A-1). Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 3 A polyvinyl butyral resin (PVB-3) was obtained in the same manner as in Example 1 except that polyvinyl alcohol (PVA-3: polymerization degree 1000, saponification degree 98 mol%) was used instead of PVA-1.
- the degree of butyralization of PVB-3 was 78 mol%, the content of vinyl ester units was 2 mol%, and the content of vinyl alcohol units was 20 mol%.
- the moisture content of PVB-3 was 0.9%, and the residual butyraldehyde content was 100 ppm by weight.
- Example 3 the obtained PVB-3 was sieved in the same manner as in Example 1 to remove the powder having a particle size of 250 ⁇ m or more to obtain a polyvinyl butyral powder (A-3).
- the average particle size of primary particles in the powder (A-3) was 3.0 ⁇ m, and the average particle size (aggregated particles) of the powder (A-3) was 80 ⁇ m.
- a powder coating material 3 was obtained in the same manner as in Example 1 except that the powder (A-3) prepared above was used instead of the powder (A-1). Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 4 A polyvinyl butyral resin (PVB-4) was obtained in the same manner as in Example 1 except that polyvinyl alcohol (PVA-4: polymerization degree 200, saponification degree 98 mol%) was used instead of PVA-1.
- the degree of butyralization of PVB-4 was 78 mol%, the content of vinyl ester units was 2 mol%, and the content of vinyl alcohol units was 20 mol%.
- the moisture content of PVB-4 was 0.7%, and the residual butyraldehyde content was 90 ppm by weight.
- Example 2 the obtained PVB-4 was sieved in the same manner as in Example 1 to remove the powder having a particle size of 250 ⁇ m or more to obtain a polyvinyl butyral powder (A-4).
- the average particle diameter of primary particles in the powder (A-4) was 3.0 ⁇ m, and the average particle diameter (aggregated particles) of the powder (A-4) was 80 ⁇ m.
- a powder coating material 4 was obtained in the same manner as in Example 1 except that the powder (A-4) prepared above was used instead of the powder (A-1). Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 5 “IRGANOX 1098” (average particle size 59 ⁇ m) manufactured by Ciba Specialty Chemicals; N, N′-hexane-1,6-diylbis with respect to 100 parts of the powder (A-1) obtained in Example 1 Example 3 was repeated except that 0.5 part of [3- (3,5-di-t-butyl-4-hydroxyphenylpropionamide)] (melting point: 156 ° C.-161 ° C., molecular weight: 637) was added. A powder coating 5 was obtained. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 6 For 100 parts of the powder (A-1) obtained in Example 1, “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; Powder coating 6 was obtained in the same manner as in Example 1 except that 0.05 part of (t-butyl-4-hydroxyphenyl) propionate] (melting point: 104 ° C.-108 ° C., molecular weight: 639) was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 7 For 100 parts of the powder (A-1) obtained in Example 1, “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; Powder coating 7 was obtained in the same manner as in Example 1 except that 0.2 part of (t-butyl-4-hydroxyphenyl) propionate] (melting point: 104 ° C.-108 ° C., molecular weight: 639) was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 8 For 100 parts of the powder (A-1) obtained in Example 1, “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; Powder coating 8 was obtained in the same manner as in Example 1 except that 1.0 part of (t-butyl-4-hydroxyphenyl) propionate] (melting point: 104 ° C.-108 ° C., molecular weight: 639) was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 9 For 100 parts of the powder (A-1) obtained in Example 1, “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; Powder coating material 9 was obtained in the same manner as in Example 1 except that 3.0 parts of (t-butyl-4-hydroxyphenyl) propionate] (melting point: 104 ° C.-108 ° C., molecular weight: 639) was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 10 For 100 parts of the powder (A-1) obtained in Example 1, “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; Powder paint 10 was obtained in the same manner as in Example 1 except that 4.8 parts of (t-butyl-4-hydroxyphenyl) propionate] (melting point: 104 ° C.-108 ° C., molecular weight: 639) were added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 11 For 100 parts of the powder (A-1) obtained in Example 1, “Sumilizer BBM-S” (average particle size 63 ⁇ m) manufactured by Sumitomo Chemical Co., Ltd .; 4,4′-butylidenebis (6-t-butyl- A powder coating material 11 was obtained in the same manner as in Example 1 except that 1.0 part of 3-methylphenol) melting point 209 ° C. and molecular weight 383) was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Example 12 With respect to 100 parts of the powder (A-1) obtained in Example 1, “ADEKA STAB AO-80” (average particle diameter 74 ⁇ m) manufactured by Adeka Company; 3,9-bis ⁇ 1,1-dimethyl-2- [ ⁇ - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl ⁇ 2,4,8,10-tetraoxaspiro [5,5] -undecane (melting point 110-120 ° C., molecular weight 741 ) was added in the same manner as in Example 1 except that 1.0 part was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Comparative Example 1 The powder (A-1) obtained in Example 1 was used as the powder coating 13 as it was. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Comparative Example 2 “BHT” (average particle diameter 77 ⁇ m); 3,5-di-t-butyl-4-hydroxytoluene (melting point: 71 ° C., based on 100 parts by weight of the powder (A-1) obtained in Example 1
- a powder coating material 14 was obtained in the same manner as in Example 1 except that 0.5 part of molecular weight 220) was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Comparative Example 3 “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; hexamethylenebis [3- (3,5) with respect to 100 parts by weight of the powder (A-1) obtained in Example 1 -Di-t-butyl-4-hydroxyphenyl) propionate] was added in the same manner as in Example 1 except that 7 parts were added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Comparative Example 4 “IRGANOX 259” (average particle size 83 ⁇ m) manufactured by Ciba Specialty Chemicals; hexamethylenebis [3- (3,5) with respect to 100 parts by weight of the powder (A-1) obtained in Example 1 -Di-t-butyl-4-hydroxyphenyl) propionate] was added in the same manner as in Example 1 except that 0.015 part was added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Comparative Example 5 “IRGAMOD 295” (average particle size 89 ⁇ m) manufactured by Ciba Specialty Chemicals; diethyl ⁇ [3,5-bis (1) with respect to 100 parts by weight of the powder (A-1) obtained in Example 1 , 1-dimethylethyl) -4-hydroxylphenyl] methyl ⁇ phosphonate (melting point 116 ° C.-121 ° C., molecular weight 356) was added in the same manner as in Example 1 except that 0.5 parts of powder coating material 17 was prepared. Obtained. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Comparative Example 6 “IRGANOX 1076” (average particle size 81 ⁇ m) manufactured by Ciba Specialty Chemicals; n-octadecyl- ⁇ - (4′-) with respect to 100 parts by weight of the powder (A-1) obtained in Example 1 In the same manner as in Example 1 except that 0.5 part of hydroxy-3 ′, 5′-di-t-butylphenyl) propionate (melting point: 50 ° C.-53 ° C., molecular weight: 531) was added, Obtained. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Comparative Example 7 “IRGANOX 1330” (average particle size 78 ⁇ m) manufactured by Ciba Specialty Chemicals; 3, 3 ′, 3 ′′, 5, based on 100 parts by weight of the powder (A-1) obtained in Example 1 5 ′, 5 ′′ -hexa-t-butyl- ⁇ , ⁇ ′, ⁇ ′′-(mesitylene-2,4,6-tolyl) tri-p-cresol (melting point 240 ° C.-245 ° C., molecular weight 775)
- a powder coating material 19 was obtained in the same manner as in Example 1 except that 5 parts were added. Further, in the same manner as in Example 1, a coated product coated with a powder coating material was prepared, and the coating film was evaluated. The results are shown in Table 1.
- Examples 1 to 12 are good paints that do not yellow, are smooth and do not sag, and do not crack or peel even when bent. It turns out that you can get.
- the powder coating of the present invention is suitable for coating metal substrates such as steel pipes and steel plates, and the final products to be coated include carts (eg, shopping carts, basket stands, carts, airport carts, etc.) Shopping carts), water pipes, metal baskets, chemical tanks, overcoats for home appliances, and automotive parts.
- carts eg, shopping carts, basket stands, carts, airport carts, etc.
- the powder coating material of the present invention can also be used in molding methods such as rotational molding and compression molding.
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Abstract
Description
(ポリビニルアセタール樹脂のビニルエステル単位含有量)
JIS K6728に記載の方法に基づき測定した。
(ポリビニルアセタール樹脂のビニルアルコール単位含有量)
JIS K6728に記載の方法に基づき測定した。
(ポリビニルアセタール樹脂の水分量)
ポリビニルアセタール樹脂を、乾燥機により105℃で3時間乾燥させ、式{(乾燥前の樹脂の重量)-(乾燥後の樹脂の重量)}/{乾燥前の樹脂の重量}×100(%)により算出した。
(ポリビニルアセタール樹脂のアルデヒド残存量)
本体に島津製作所製ヘッドスペースガスクロマトグラフィーGC-14B、カラムにGL Science Inc製TC-1(内径0.25mm.長さ30m)を用いて測定した。
(ポリビニルアセタール樹脂の集合粒子および酸化防止剤の平均粒子径)
(株)島津製作所製の粒度分布測定装置SALD2200により測定した。
(ポリビニルアセタール樹脂の1次粒子の平均粒子径)
走査型電子顕微鏡(SEM)により、倍率1000で、ポリビニルアセタール樹脂の写真を3箇所(3枚)撮影し、それぞれの写真より判定可能な1次粒子径を測定(写真1枚につき50点以上)し、その平均値を求めた。なお、それぞれの1次粒子の径は長径を測定した。
(ポリビニルアセタール樹脂の1次粒子の最大粒子径)
上記SEM写真から観察される1次粒子の最大粒子を測定した。
(ポリビニルアセタール樹脂の調製)
還流冷却器、温度計およびイカリ型攪拌翼を備えた内容積2リットルのガラス製容器に、イオン交換水1295gと、ポリビニルアルコール(PVA-1:重合度600、けん化度98モル%)105gとを仕込み、全体を95℃に昇温してポリビニルアルコールを完全に溶解させ、ポリビニルアルコール水溶液(濃度7.5重量%)を形成した。形成したポリビニルアルコール水溶液を、回転速度120rpmにて攪拌し続けながら、約30分かけて10℃まで徐々に冷却した後、当該水溶液に、ブチルアルデヒド66gと、ブチラール化触媒である酸触媒として濃度20重量%の塩酸90mlとを添加して、ポリビニルアルコールのブチラール化を開始した。ブチラール化を150分間行った後、60分かけて全体を50℃まで昇温し、50℃にて120分間保持した後に、室温まで冷却した。冷却によって析出した樹脂をろ過後、イオン交換水(樹脂に対して100倍量のイオン交換水)で洗浄した後、中和のために0.3重量%水酸化ナトリウム溶液を加え、40℃で10時間保持した後、さらに100倍量のイオン交換水で再洗浄し、脱水したのち、40℃、減圧下で18時間乾燥し、ポリビニルブチラール樹脂(PVB-1:水分含有量0.7%)を得た。
上記のようにして作製したポリビニルブチラール樹脂(PVB-1)を、60メッシュ(目開き250μm)の金網を用いて篩にかけ、粒子径が250μm以上の粉体を除去して、ポリビニルブチラール粉体(A-1)を得た。粉体(A-1)における1次粒子の平均粒子径は3.5μm、粉体(A-1)の平均粒子径(集合粒子)は80μmであった。
(粉体塗料の調製)
上記で得られた粉体(A-1)100部に対し、酸化防止剤:チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート](融点104℃-108℃、分子量639)を0.5部添加し、ドライブレンダーにより混合し、粉体塗料1を得た。
作製した粉体塗料1を用いて、以下のようにして塗装と評価を行った。
(粉体塗料を用いた鉄板の塗装)
0.2mm(厚)×50mm×100mm鉄板の表面を洗剤を用いて洗浄して脱脂した後、イオン交換水で十分に洗浄して基材とした。この基材表面に、粉体塗料1を用い、流動浸漬法により塗装を行った。具体的には、微細多孔板を低部に有する円筒状の塗装室(流動室)(高さ50cm、直径30cm)を備えた容器に粉体塗料1を投入し、上記微細多孔板の下部から、当該多孔板を通じて塗装室に空気を吹き込み、粉体塗料1を流動させた。前記鉄板からなる基材を予熱し(温度300℃、10分間)、これを粉体塗料1の流動層中に懸垂し、10秒経過した後に取り出し、230℃の温度条件で10分間加熱して、塗装物を得た。
A:黄色味がなく透明。
B:僅かに黄変が見られるが実用上問題なし。
C:黄色に変色してしまい外観不良。
A:平滑性に優れ、垂れ、ピンホールなどが全くみられない。
B:塗膜にわずかな垂れが見られるが、ピンホールは全く見られない。
C:粉体塗料の大きな垂れ、ピンホールが見られる。
A:基材を折り曲げた際に、塗膜の剥離やヒビが全く見られない。
B:基材を折り曲げた際に、塗膜表面に素地が露出しない範囲で軽微なヒビが見られる。
C:基材を折り曲げた際に、一部に塗膜の剥離やヒビが見られる。
D:基材を折り曲げた際に、大きな塗膜の剥離やヒビが見られる。
PVA-1に代わって、ポリビニルアルコール(PVA-2:重合度300、けん化度95モル%)を用いた以外は実施例1と同様にして、ポリビニルブチラール樹脂(PVB-2)を得た。PVB-2のブチラール化度は75モル%、ビニルエステル単位の含有量は5モル%、ビニルアルコール単位の含有量は20モル%であった。PVB-2の水分量は0.8%、残存ブチルアルデヒド含有量は100重量ppmであった。
次に、粉体(A-1)の代わりに上記作製した粉体(A-2)を用いた以外は実施例1と同様にして、粉体塗料2を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
PVA-1に代わって、ポリビニルアルコール(PVA-3:重合度1000、けん化度98モル%)を用いた以外は実施例1と同様にして、ポリビニルブチラール樹脂(PVB-3)を得た。PVB-3のブチラール化度は78モル%、ビニルエステル単位の含有量は2モル%、ビニルアルコール単位の含有量は20モル%であった。PVB-3の水分量は0.9%、残存ブチルアルデヒド含有量は100重量ppmであった。
次に、粉体(A-1)の代わりに上記作製した粉体(A-3)を用いた以外は実施例1と同様にして、粉体塗料3を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
PVA-1に代わって、ポリビニルアルコール(PVA-4:重合度200、けん化度98モル%)を用いた以外は実施例1と同様にして、ポリビニルブチラール樹脂(PVB-4)を得た。PVB-4のブチラール化度は78モル%、ビニルエステル単位の含有量は2モル%、ビニルアルコール単位の含有量は20モル%であった。PVB-4の水分量は0.7%、残存ブチルアルデヒド含有量は90重量ppmであった。
次に、粉体(A-1)の代わりに上記作製した粉体(A-4)を用いた以外は実施例1と同様にして、粉体塗料4を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 1098」(平均粒子径59μm);N,N’-ヘキサン-1,6-ジイルビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニルプロピオンアミド)](融点156℃-161℃、分子量637)を0.5部添加した以外は、実施例1と同様にして、粉体塗料5を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート](融点104℃-108℃、分子量639)を0.05部添加した以外は実施例1と同様にして、粉体塗料6を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート](融点104℃-108℃、分子量639)を0.2部添加した以外は実施例1と同様にして、粉体塗料7を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート](融点104℃-108℃、分子量639)を1.0部添加した以外は実施例1と同様にして、粉体塗料8を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート](融点104℃-108℃、分子量639)を3.0部添加した以外は実施例1と同様にして、粉体塗料9を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート](融点104℃-108℃、分子量639)を4.8部添加した以外は実施例1と同様にして、粉体塗料10を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、住友化学社製の「Sumilizer BBM-S」(平均粒子径63μm);4,4’-ブチリデンビス(6-t-ブチル-3-メチルフェノール)融点209℃、分子量383)を1.0部添加した以外は、実施例1と同様にして、粉体塗料11を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100部に対し、アデカ社製「アデカスタブAO-80」(平均粒子径74μm);3,9-ビス{1,1-ジメチル-2-[β-(3-t-ブチル-4-ヒドロキシ-5-メチルフェニル)プロピオニルオキシ]エチル}2,4,8,10-テトラオキサスピロ[5,5]-ウンデカン(融点110-120℃、分子量741)を1.0部添加した以外は、実施例1と同様にして、粉体塗料12を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す
実施例1で得られた粉体(A-1)をそのまま粉体塗料13として使用した。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100重量部に対して、「BHT」(平均粒子径77μm);3,5-ジ-t-ブチル-4-ヒドロキシトルエン(融点71℃、分子量220)を0.5部添加した以外は、実施例1と同様にして、粉体塗料14を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100重量部に対して、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]を7部添加した以外は、実施例1と同様にして、粉体塗料15を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100重量部に対して、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 259」(平均粒子径83μm);ヘキサメチレンビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]を0.015部添加した以外は、実施例1と同様にして、粉体塗料16を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100重量部に対して、チバ・スペシャルティ・ケミカルズ社製の「IRGAMOD 295」(平均粒子径89μm);ジエチル{[3,5-ビス(1,1-ジメチルエチル)-4-ヒドロキシルフエニル]メチル}ホスホネート(融点116℃-121℃、分子量356)を0.5部添加した以外は、実施例1と同様にして、粉体塗料17を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100重量部に対して、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 1076」(平均粒子径81μm);n-オクタデシル-β-(4’-ヒドロキシ-3’,5’-ジ-t-ブチルフェニル)プロピオネート(融点50℃-53℃、分子量531)を0.5部添加した以外は、実施例1と同様にして、粉体塗料18を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
実施例1で得られた粉体(A-1)100重量部に対して、チバ・スペシャルティ・ケミカルズ社製の「IRGANOX 1330」(平均粒子径78μm);3,3’,3”,5,5’,5”-ヘキサ-t-ブチル-α,α’,α”-(メシチレン-2,4,6-トリル)トリ-p-クレゾール(融点240℃-245℃、分子量775)を0.5部添加した以外は、実施例1と同様にして、粉体塗料19を得た。
さらに実施例1と同様にして、粉体塗料を塗装した塗装物を作製し、その塗膜の評価を行った。結果を表1に示す。
Claims (9)
- ポリビニルアセタール樹脂と、
当該ポリビニルアセタール樹脂に対し0.02~5重量%の、分子量380~1000かつ融点80~230℃の酸化防止剤とを含有するポリビニルアセタール系粉体塗料。 - 前記酸化防止剤の分子量が、400~1000である請求項1に記載のポリビニルアセタール系粉体塗料。
- 前記ポリビニルアセタール樹脂が、水分量2.5重量%以下、かつ残存アルデヒド含有量1000重量ppm以下のポリビニルアセタール樹脂である請求項1に記載のポリビニルアセタール系粉体塗料。
- 前記ポリビニルアセタール樹脂が、ビニルアルコール系重合体を炭素数2~6のアルデヒドでアセタール化することにより得られるポリビニルアセタール樹脂である請求項1に記載のポリビニルアセタール系粉体塗料。
- 前記ポリビニルアセタール樹脂が、ポリビニルブチラール樹脂である請求項1に記載のポリビニルアセタール系粉体塗料。
- 前記ポリビニルアセタール樹脂と前記酸化防止剤が、ドライブレンドされている請求項1に記載のポリビニルアセタール系粉体塗料。
- 請求項1に記載のポリビニルアセタール系粉体塗料を塗装して得られる塗膜。
- 請求項1に記載のポリビニルアセタール系粉体塗料を塗装したカート。
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JP2009549972A JP5473611B2 (ja) | 2008-01-16 | 2008-12-17 | ポリビニルアセタール系粉体塗料 |
US12/863,378 US8188173B2 (en) | 2008-01-16 | 2008-12-17 | Polyvinyl acetal powder coating material |
CN2008801250007A CN101910333B (zh) | 2008-01-16 | 2008-12-17 | 聚乙烯醇缩醛系粉体涂料 |
EP08870809.4A EP2236572B1 (en) | 2008-01-16 | 2008-12-17 | Polyvinyl acetal powder coating material |
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EP (1) | EP2236572B1 (ja) |
JP (1) | JP5473611B2 (ja) |
CN (1) | CN101910333B (ja) |
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Cited By (5)
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JP2011147845A (ja) * | 2010-01-19 | 2011-08-04 | Kawanetsu Co Ltd | 高耐久性防食鋼材とその製造方法ならびに製造装置 |
WO2011141384A1 (de) * | 2010-05-11 | 2011-11-17 | Kuraray Europe Gmbh | Pvb-folie mit phenolischen antioxidantien der teilstruktur 3-t-butyl-4-hydroxy-5-methylphenylproprionat |
JP2012031533A (ja) * | 2010-07-29 | 2012-02-16 | Kawanetsu Co Ltd | 撚り線 |
JP2012158705A (ja) * | 2011-02-02 | 2012-08-23 | Nippon Telegr & Teleph Corp <Ntt> | 粉体塗料 |
WO2014027639A1 (ja) * | 2012-08-16 | 2014-02-20 | 株式会社クレハ | 樹脂組成物およびその用途 |
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KR102097205B1 (ko) * | 2018-05-08 | 2020-04-03 | 에스케이씨 주식회사 | 폴리비닐아세탈 수지 조성물 및 이를 포함하는 접합용 중간막 |
JP2022049585A (ja) * | 2020-09-16 | 2022-03-29 | パナソニックIpマネジメント株式会社 | 粉体層複合体、塗膜、粉体塗工方法、及び粉体塗工装置 |
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Also Published As
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EP2236572A4 (en) | 2011-03-02 |
US8188173B2 (en) | 2012-05-29 |
US20100311881A1 (en) | 2010-12-09 |
EP2236572B1 (en) | 2013-07-03 |
EP2236572A1 (en) | 2010-10-06 |
CN101910333A (zh) | 2010-12-08 |
CN101910333B (zh) | 2013-10-16 |
TW200934840A (en) | 2009-08-16 |
JPWO2009090827A1 (ja) | 2011-05-26 |
TWI453262B (zh) | 2014-09-21 |
JP5473611B2 (ja) | 2014-04-16 |
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