CN110951365A - Modified weather-resistant polyester resin powder coating and preparation method thereof - Google Patents
Modified weather-resistant polyester resin powder coating and preparation method thereof Download PDFInfo
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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
- 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
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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
- 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
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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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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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
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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
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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Abstract
The invention discloses a modified weather-resistant polyester resin powder coating and a preparation method thereof, belonging to the technical field related to polyester resin powder coatings; the modified weather-resistant polyester resin powder coating comprises the following components in parts by weight: 45-70 parts of modified polyester resin, 0.5-1.5 parts of flatting agent, 4-15 parts of modified montmorillonite, 20-40 parts of composite modified filler and 5-10 parts of hollow glass beads; the paint has the characteristics of good weather resistance, high flexibility, strong adhesive force, excellent bending resistance and salt spray resistance and the like.
Description
Technical Field
The invention relates to the technical field related to polyester resin powder coatings, in particular to a modified weather-resistant polyester resin powder coating and a preparation method thereof.
Background
The powder coating is a solid powdery synthetic resin coating composed of solid resin, pigment, filler, auxiliary agent and the like, is different from common solvent-based coatings and water-based coatings, has the characteristics of 100 percent film formation, low energy consumption, harmlessness, high efficiency, resource saving, environmental protection and the like, and is wide in application field, and the dispersion medium of the powder coating is air.
The outdoor powder coating is directly exposed in the outdoor environment and needs to be attacked by wind, rain and sunlight, so that the coating is required to have water resistance, color retention, pollution resistance, aging resistance and good adhesive force, and the performance characteristics are called weather resistance for short. In order to meet the weather resistance requirements of outdoor powder coatings, a weather resistant powder coating is needed in the prior art.
Disclosure of Invention
Aiming at the technical problem that the prior art needs a weather-resistant powder coating, the invention provides a modified weather-resistant polyester resin powder coating and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the modified weather-resistant polyester resin powder coating comprises the following components in parts by weight: 45-70 parts of modified polyester resin, 0.5-1.5 parts of flatting agent, 4-15 parts of modified montmorillonite, 20-40 parts of composite modified filler and 5-10 parts of hollow glass beads.
Furthermore, in order to reduce the curing temperature, shorten the curing time and improve the curing performance; the modified weather-resistant polyester resin powder coating also comprises the following components in parts by weight: 2-4 parts of glycidyl methacrylate, 2-4 parts of tris (2-hydroxyethyl) isocyanurate and 0.5-1.5 parts of N, N, N ', N' -tetrakis (2-hydroxyethyl) adipamide.
Further, the coating also comprises the following components in parts by weight: 0.1-0.5 part of benzotriazole, 0.3-1.2 parts of sodium fluosilicate and 0.2-0.8 part of benzoin.
Further, in order to improve the yellowing phenomenon of a coating film and further improve the weather resistance of the coating, the modified weather-resistant polyester resin powder coating also comprises 7-9 parts by weight of pigment, wherein the pigment can be one or more of titanium white, chrome yellow, iron blue and cadmium red, and can be randomly configured or selected according to needs in actual use.
In the modified weather-resistant polyester resin powder coating, the modified polyester resin is prepared by the following method under the protection of nitrogen, wherein the used materials are all calculated by weight:
s1) adding 20-30 parts of organic solvent into a reaction kettle, then adding 5-30 parts of organic silicon, 25-35 parts of organic alcohol, 0.01-0.5 part of silanol catalyst and 0.1-0.3 part of antioxidant into the organic solvent, heating to 140-180 ℃, and reacting for 2-4 hours to obtain a silanol product;
wherein: the organic solvent can be one or more of propylene glycol monobutyl ether, diethylene glycol monobutyl ether and ethylene glycol monobutyl ether;
the silicone may be polydimethylsiloxane or polyphenylsiloxane or a mixture of both;
the organic alcohol may be one or more of neopentyl glycol, trimethylolpropane, ethylene glycol and diethylene glycol;
the antioxidant can be hypophosphorous acid or triphenyl phosphite or a mixture of the two;
s2) adding 35-45 parts of organic acid and 0.1-0.3 part of esterification catalyst into the silanol product, heating the reaction kettle to 150-170 ℃, keeping the temperature for reaction for 30-40 min, heating to 220-240 ℃, and reacting for 3-5 h to obtain an esterification product; or stopping the reaction in the step when the acid value is 8-12 mgKOH/g;
wherein the organic acid is a mixture of organic acid with benzene ring and linear chain organic acid, and the raw material can be selected from phthalic acid, isophthalic acid, phthalic anhydride, adipic acid and benzoic acid;
the esterification catalyst can be one or more of dibutyl tin dilaurate, dibutyl tin diacetate and monobutyl tin oxide;
s3) adding 13-16 parts of waterborne monomers such as trimellitic anhydride and the like into the reaction kettle, and reacting for 1-2 hours to obtain the waterborne saturated polyester resin.
In any one of the modified weather-resistant polyester resin powder coatings, the modified montmorillonite is prepared by immersing 5-6 parts by weight of montmorillonite in 5-10% dilute hydrochloric acid by mass concentration, heating to 50-90 ℃, stirring for 3-5 hours, filtering, washing to neutrality, dispersing in an ethanol water solution, adding 2-4 parts by weight of humic acid and 3-4 parts by weight of 2-hydroxy-4-methoxybenzophenone, then placing in a 50-70 ℃ water bath, stirring for 2-4 hours, ultrasonically dispersing for 20-30 minutes, and finally performing suction filtration, washing, drying and grinding.
In any one of the modified weather-resistant polyester resin powder coating, the composite modified filler is prepared by drying and grinding 26-32 parts by weight of thyme, adding 26-32 parts by weight of fluorocarbon resin emulsion and 35-40 parts by weight of fly ash, stirring, mixing uniformly, standing for 12-14 h, sintering at 800-1000 ℃ for 20-30 min under the protection of nitrogen, and finally adding 5-7 parts by weight of phenyltriethoxysilane and grinding for 20-30 min.
The preparation method of the modified weather-resistant polyester resin powder coating comprises the steps of accurately weighing raw materials, uniformly stirring, heating to 130-150 ℃, reacting for 2-4 hours, cooling and grinding to 250-300 meshes.
The invention has the advantages of good weather resistance, high flexibility, strong adhesive force, excellent bending resistance and excellent salt mist resistance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the preparation process of modified weather-resistant polyester resin powder coating of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in FIG. 1, the modified weather-resistant polyester resin powder coating was prepared as follows:
examples A1 to 3: preparation of modified polyester resin
The following operations are carried out under the protection of nitrogen, wherein the dosage of the materials is calculated by weight:
example A1
S1) adding 20 parts of propylene glycol monobutyl ether into a reaction kettle to serve as an organic solvent, then adding 5 parts of polydimethylsiloxane, 25 parts of neopentyl glycol, 0.01 part of silanol catalyst and 0.1 part of hypophosphorous acid into the organic solvent, and heating to 140 ℃ to react for 2 hours to obtain a silanol product;
s2) adding 35 parts of phthalic acid and 0.1 part of dibutyl tin dilaurate into the silanol product, heating the reaction kettle to 150 ℃, keeping the temperature for reaction for 30min, heating to 220 ℃ for reaction for 3h to obtain an esterified product, or stopping the reaction when the acid value is 8 mgKOH/g;
s3) adding 13 parts of trimellitic anhydride into the reaction kettle, and reacting for 1 hour to obtain the waterborne saturated polyester resin.
Example A2
S1) adding 25 parts of diethylene glycol monobutyl ether into a reaction kettle to serve as an organic solvent, then adding 15 parts of polyphenylsiloxane, 30 parts of trimethylolpropane, 0.25 part of silanol catalyst and 0.2 part of triphenyl phosphite into the organic solvent, heating to 160 ℃, and reacting for 3 hours to obtain a silanol product;
s2) adding 40 parts of isophthalic acid and 0.1 part of dibutyltin diacetate into the silanol product, heating the reaction kettle to 160 ℃, keeping the temperature for reaction for 35min, heating to 230 ℃ for reaction for 4h to obtain an esterified product, or stopping the reaction in the step when the acid value is 10 mgKOH/g;
s3) adding 15 parts of trimellitic anhydride into the reaction kettle, and reacting for 1.5h to obtain the waterborne saturated polyester resin.
Example A3
S1) adding 30 parts of ethylene glycol monobutyl ether into a reaction kettle to serve as an organic solvent, then adding 30 parts of polyphenylsiloxane, 35 parts of ethylene glycol, 0.5 part of silanol catalyst and 0.3 part of triphenyl phosphite into the organic solvent, heating to 180 ℃, and reacting for 4 hours to obtain a silanol product; in specific implementation, the ethylene glycol can be replaced by diethylene glycol;
s2) adding 45 parts of phthalic anhydride and 0.3 part of monobutyl tin oxide into the silanol product, heating the reaction kettle to 170 ℃, keeping the temperature for reaction for 40min, heating to 240 ℃ for reaction for 5h to obtain an esterified product, or stopping the reaction when the acid value is 12 mgKOH/g; in specific implementation, the phthalic anhydride can be replaced by adipic acid or benzoic acid;
s3) adding 16 parts of water-based monomer into the reaction kettle to react for 2 hours to obtain the water-based saturated polyester resin.
Examples B1 to 3: preparation of modified montmorillonite
Example B1
Immersing 5 parts by weight of montmorillonite in 5% dilute hydrochloric acid, heating to 50 ℃, stirring for 3 hours, filtering, washing to be neutral, dispersing in an ethanol water solution, adding 2 parts by weight of humic acid and 3 parts by weight of 2-hydroxy-4-methoxybenzophenone, then placing in a 50 ℃ water bath, stirring for 2-4 hours, ultrasonically dispersing for 20-30 min, and finally carrying out suction filtration, washing, drying and grinding to obtain the montmorillonite-containing aqueous solution.
Example B2
Immersing 5.5 parts by weight of montmorillonite in dilute hydrochloric acid with the mass concentration of 8%, heating to 70 ℃, stirring for 4 hours, filtering, washing to be neutral, dispersing in an ethanol water solution, adding 3 parts by weight of humic acid and 3.5 parts by weight of 2-hydroxy-4-methoxybenzophenone, then placing in a water bath with the temperature of 60 ℃, stirring for 3 hours, ultrasonically dispersing for 25 minutes, and finally carrying out suction filtration, washing, drying and grinding to obtain the montmorillonite-modified humic acid.
Example B3
Immersing 6 parts by weight of montmorillonite in 10% dilute hydrochloric acid, heating to 90 ℃, stirring for 5 hours, filtering, washing to be neutral, dispersing in an ethanol water solution, adding 4 parts by weight of humic acid and 4 parts by weight of 2-hydroxy-4-methoxybenzophenone, then placing in a 70 ℃ water bath, stirring for 4 hours, ultrasonically dispersing for 30 minutes, and finally carrying out suction filtration, washing, drying and grinding to obtain the montmorillonite-containing aqueous solution.
Examples C1 to 3: preparation of composite modified filler
Example C1
Drying and grinding 26 parts by weight of thyme, adding 26 parts by weight of fluorocarbon resin emulsion and 35 parts by weight of fly ash, uniformly stirring, uniformly mixing, standing for 12 hours, sintering at 800 ℃ for 20 minutes under the protection of nitrogen, and finally adding 5 parts by weight of phenyltriethoxysilane, and grinding for 20 minutes to obtain the thyme powder.
Example C2
Drying and grinding 29 parts by weight of thyme, adding 29 parts by weight of fluorocarbon resin emulsion and 38 parts by weight of fly ash, uniformly stirring, uniformly mixing, standing for 13 hours, sintering at 900 ℃ for 25 minutes under the protection of nitrogen, and finally adding 6 parts by weight of phenyltriethoxysilane and grinding for 25 minutes to obtain the thyme powder.
Example C3
Drying and grinding 32 parts by weight of thyme, adding 32 parts by weight of fluorocarbon resin emulsion and 40 parts by weight of fly ash, uniformly stirring, uniformly mixing, standing for 14 hours, sintering at 1000 ℃ for 30 minutes under the protection of nitrogen, and finally adding 7 parts by weight of phenyltriethoxysilane, and grinding for 30 minutes.
Examples D1 to 3: preparation of modified weather-resistant polyester resin powder coating
Example D1
Accurately weighing 45 parts of the modified polyester resin prepared in any one of examples A1-3, 0.5 part of a leveling agent, 4 parts of the modified montmorillonite prepared in any one of examples B1-3, 20 parts of the composite modified filler prepared in any one of examples C1-3 and 5 parts of hollow glass microspheres, uniformly stirring, heating to 130 ℃, reacting for 2 hours, cooling and grinding to 250-300 meshes to obtain the modified montmorillonite-silica composite material.
Example D2
The preparation method comprises the steps of accurately weighing 60 parts of the modified polyester resin prepared in any one of examples A1-3, 1 part of a leveling agent, 10 parts of the modified montmorillonite prepared in any one of examples B1-3, 30 parts of the composite modified filler prepared in any one of examples C1-3 and 8 parts of hollow glass beads, uniformly stirring, heating to 140 ℃, reacting for 3 hours, cooling and grinding to 250-300 meshes to obtain the modified montmorillonite-based composite material.
Example D3
Accurately weighing 70 parts of the modified polyester resin prepared in any one of examples A1-3, 1.5 parts of a leveling agent, 15 parts of the modified montmorillonite prepared in any one of examples B1-3, 40 parts of the composite modified filler prepared in any one of examples C1-3 and 10 parts of hollow glass microspheres, uniformly stirring, heating to 150 ℃, reacting for 4 hours, cooling and grinding to 250-300 meshes to obtain the modified montmorillonite-silica composite material.
Examples E1 to 3: preparation of modified weather-resistant polyester resin powder coating with higher curing property
Example E1
In addition to any one of examples D1 to 3, the following components were added in parts by weight based on the original raw materials: 2 parts of glycidyl methacrylate, 2 parts of tris (2-hydroxyethyl) isocyanurate and 0.5 part of N, N, N ', N' -tetrakis (2-hydroxyethyl) adipamide; other conditions and operation steps are the same as those of the original embodiment.
Example E2
In addition to any one of examples D1 to 3, the following components were added in parts by weight based on the original raw materials: 3 parts of glycidyl methacrylate, 3 parts of tris (2-hydroxyethyl) isocyanurate and 1 part of N, N, N ', N' -tetrakis (2-hydroxyethyl) adipamide; other conditions and operation steps are the same as those of the original embodiment.
Example E3
In addition to any one of examples D1 to 3, the following components were added in parts by weight based on the original raw materials: 4 parts of glycidyl methacrylate, 4 parts of tris (2-hydroxyethyl) isocyanurate and 1.5 parts of N, N, N ', N' -tetrakis (2-hydroxyethyl) adipamide; other conditions and operation steps are the same as those of the original embodiment.
Examples F1 to 3: preparation of modified weather-resistant polyester resin powder coating with higher weather resistance
Example F1
In addition to any one of examples D1 to 3 and/or E1 to 3, the following components are added in parts by weight based on the original raw materials: 0.1 part of benzotriazole, 0.3 part of sodium fluosilicate and 0.2 part of benzoin; other conditions and operation steps are the same as those of the original embodiment.
Example F2
In addition to any one of examples D1 to 3 and/or E1 to 3, the following components are added in parts by weight based on the original raw materials: 0.3 part of benzotriazole, 0.8 part of sodium fluosilicate and 0.5 part of benzoin; other conditions and operation steps are the same as those of the original embodiment.
Example F3
In addition to any one of examples D1 to 3 and/or E1 to 3, the following components are added in parts by weight based on the original raw materials: 0.5 part of benzotriazole, 1.2 parts of sodium fluosilicate and 0.8 part of benzoin; other conditions and operation steps are the same as those of the original embodiment.
Examples G1 to 3: preparation of color modified weather-resistant polyester resin powder coating
Example G1
7 parts by weight of a pigment was added to the raw materials used in examples D1 to 3, E1 to 3 and/or F1 to 3; other conditions and operation steps are the same as those of the original embodiment; wherein, the pigment can be any industrial pigment such as titanium white, chrome yellow, iron blue, cadmium red and the like.
Example G2
Adding 8 parts by weight of pigment to the original raw materials on the basis of any one of examples D1-3, E1-3 and/or F1-3; other conditions and operation steps are the same as those of the original embodiment; wherein, the pigment can be any industrial pigment such as titanium white, chrome yellow, iron blue, cadmium red and the like.
Example G3
9 parts by weight of a pigment was added to the raw materials used in examples D1 to 3, E1 to 3 and/or F1 to 3; other conditions and operation steps are the same as those of the original embodiment; wherein, the pigment can be any industrial pigment such as titanium white, chrome yellow, iron blue, cadmium red and the like.
Detecting the performance of the modified weather-resistant polyester resin powder coating (baking conditions are 150 ℃, 30 min):
according to detection data, the modified weather-resistant polyester resin powder coating disclosed by the invention is good in flexibility, strong in adhesive force, and good in bending resistance and salt spray resistance after being baked at 150 ℃ for 30 min.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are within the scope of the invention.
Claims (8)
1. A modified weather-resistant polyester resin powder coating is characterized in that: comprises the following components in parts by weight: 45-70 parts of modified polyester resin, 0.5-1.5 parts of flatting agent, 4-15 parts of modified montmorillonite, 20-40 parts of composite modified filler and 5-10 parts of hollow glass beads.
2. The modified weather-resistant polyester resin powder coating of claim 1, wherein: the coating also comprises the following components in parts by weight: 2-4 parts of glycidyl methacrylate, 2-4 parts of tris (2-hydroxyethyl) isocyanurate and 0.5-1.5 parts of N, N, N ', N' -tetrakis (2-hydroxyethyl) adipamide.
3. The modified weather-resistant polyester resin powder coating of claim 1, wherein: the coating also comprises the following components in parts by weight: 0.1-0.5 part of benzotriazole, 0.3-1.2 parts of sodium fluosilicate and 0.2-0.8 part of benzoin.
4. The modified weather-resistant polyester resin powder coating of claim 1, wherein: also comprises 7-9 parts by weight of pigment.
5. The modified weather-resistant polyester resin powder coating as claimed in any one of claims 1 to 4, wherein: the modified polyester resin is prepared by the following method under the protection of nitrogen, wherein the dosage of the related materials is calculated by weight parts:
s1) adding 20-30 parts of organic solvent into a reaction kettle, then adding 5-30 parts of organic silicon, 25-35 parts of organic alcohol, 0.01-0.5 part of silanol catalyst and 0.1-0.3 part of antioxidant into the organic solvent, heating to 140-180 ℃, and reacting for 2-4 hours to obtain a silanol product;
s2) adding 35-45 parts of organic acid and 0.1-0.3 part of esterification catalyst into the silanol product, heating the reaction kettle to 150-170 ℃, keeping the temperature for reaction for 30-40 min, heating to 220-240 ℃, and reacting for 3-5 h to obtain an esterification product;
s3) adding 13-16 parts of water-based monomer into the reaction kettle, and reacting for 1-2 hours to obtain the water-based saturated polyester resin.
6. The modified weather-resistant polyester resin powder coating as claimed in any one of claims 1 to 4, wherein: the modified montmorillonite is prepared by immersing 5-6 parts by weight of montmorillonite in dilute hydrochloric acid with the mass concentration of 5-10% and heating to 50-90 ℃, stirring for 3-5 hours, filtering, washing to be neutral, dispersing in an ethanol water solution, adding 2-4 parts by weight of humic acid and 3-4 parts by weight of 2-hydroxy-4-methoxybenzophenone, stirring for 2-4 hours in a water bath with the temperature of 50-70 ℃, ultrasonically dispersing for 20-30 minutes, and finally performing suction filtration, washing, drying and grinding.
7. The modified weather-resistant polyester resin powder coating as claimed in any one of claims 1 to 4, wherein: the composite modified filler is prepared by drying and grinding 26-32 parts by weight of thyme, adding 26-32 parts by weight of fluorocarbon resin emulsion and 35-40 parts by weight of fly ash, stirring, mixing uniformly, standing for 12-14 h, sintering at 800-1000 ℃ for 20-30 min under the protection of nitrogen, and finally adding 5-7 parts by weight of phenyltriethoxysilane and grinding for 20-30 min.
8. A method for preparing the modified weather-resistant polyester resin powder coating as claimed in any one of claims 1 to 7, wherein: accurately weighing the raw materials, stirring and uniformly mixing the raw materials, heating the mixture to 130-150 ℃, reacting for 2-4 h, cooling and grinding.
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| CN112063273A (en) * | 2020-09-01 | 2020-12-11 | 阜南县腾博工艺品有限公司 | Preparation method of low-temperature curing powder coating for surface of wicker-woven handicraft |
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