CN116285583A - Photocatalytic self-repairing aluminum veneer and preparation method thereof - Google Patents
Photocatalytic self-repairing aluminum veneer and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a photocatalysis self-repairing aluminum veneer and a preparation method thereof, wherein the aluminum veneer comprises a substrate and a coating coated on the upper layer of the substrate, the coating comprises a primer layer, an external force repairing layer and a corrosion repairing layer from inside to outside, and the preparation method comprises the steps of (1) firstly mixing the primer layer, the external force repairing layer and the corrosion repairing layer according to a proportion for standby; (2) Polishing and flattening the surface of the aluminum veneer by using sand paper, degreasing by using a degreasing agent, cleaning by using acetone and clear water, and drying for later use; (3) The method comprises the steps of firstly adopting a high-voltage electrostatic spray gun to spray a primer layer, continuously adopting the high-voltage electrostatic spray gun to spray an external force repairing layer after being placed and volatilized at room temperature, drying and solidifying after being placed and volatilized at room temperature, and spraying a corrosion repairing layer through an electric spraying machine after cooling is finished, thus obtaining the self-repairing weather-resistant aluminum veneer after finishing spraying. The invention has the advantages that the self-repairing can be carried out in the photo-thermal environment after rust, external damage or environmental damage occurs, and the service life is longer.
Description
Technical Field
The invention relates to the technical field of aluminum veneer manufacturing, in particular to a photocatalysis self-repairing aluminum veneer and a preparation method thereof.
Background
The curtain wall aluminum veneer is a novel curtain wall material which is formed by adopting high-quality aluminum alloy plates as base materials and adopting numerical control bending and other technologies, and decorative paint is sprayed on the surface of the curtain wall aluminum veneer.
Over time, the surface coating of the building curtain wall can be subjected to phenomena of light loss, color change, pulverization and falling off in the atmospheric environment, so that the curtain wall base material is exposed, and the curtain wall base material is corroded by chemical or electrochemical reaction when contacting with corrosive media in the environment, so that the performance is degraded or even destroyed, and the corrosion prevention technology of the curtain wall base material plays an extremely important role in the safety performance and durability of the curtain wall base material. And when the aluminum veneer is damaged by external force or environment, the aluminum veneer is difficult to repair by self, and the overall attractiveness is affected.
Disclosure of Invention
The invention aims to provide a photocatalysis self-repairing aluminum veneer and a preparation method thereof, which can realize self-repairing in a photo-thermal environment after rusting, external force damage or environmental damage, and has longer service life.
The technical aim of the invention is realized by the following technical scheme:
the photocatalysis self-repairing aluminum veneer is characterized by comprising a substrate and a coating coated on the upper layer of the substrate, wherein the coating comprises a primer layer, an external force repairing layer and a corrosion repairing layer from inside to outside;
the primer layer is composed of the following components in parts by weight: 20-28 parts of waterborne epoxy resin, 2-5 parts of amino resin, 1-2 parts of epoxy phosphate, 6-8 parts of titanium dioxide and 1-2 parts of dispersing agent;
the external force repairing layer is composed of the following components in parts by weight: 3-5 pieces of nigrosine particles, 21-35 parts of ferroferric oxide nano particles, 41-48 parts of thermosetting acrylic resin and 10-16 parts of acetylacetone;
the corrosion repair layer is composed of the following components in parts by weight: 8-12 parts of self-repairing microcapsule, 30-38 parts of aqueous epoxy resin, 5-8 parts of curing agent and 3-7 parts of antioxidant.
Preferably, the dispersing agent is selected from one of N, N' -vinyl bis-stearamide, methyl phenyl polysiloxane and sodium hexametaphosphate.
Preferably, the preparation method of the ferroferric oxide nano-particles comprises the following steps: dissolving ferric chloride hexahydrate in deionized water at normal temperature, adding excessive Na under nitrogen protection 2 SO 3 And (3) magnetically stirring the solution for 20min, quickly adding concentrated ammonia water with the mass fraction of 25% -28%, quickly blackening the solution, reacting in an oil bath at 60 ℃ for 30min, then dropwise adding citric acid, adjusting the temperature to 80 ℃, reacting for 1h, cooling the room temperature, settling the magnetic balls, washing the magnetic balls with acetone and deionized water for several times, and then ultrasonically dispersing in the deionized water to obtain stable ferroferric oxide nano particles with magnetism.
Preferably, the mass volume ratio of the ferric chloride hexahydrate, the citric acid and the concentrated ammonia water is 21g: 0.5-0.7 g: 5-10 ml.
Preferably, the curing agent is selected from one of an aqueous epoxy curing agent LLG-119, an aqueous epoxy curing agent WG-828 and an aqueous epoxy curing agent K-19.
Preferably, the antioxidant is selected from one of tetrapentaerythritol ester, secondary diarylamines, p-phenylenediamine and ketoamine.
Preferably, the preparation method of the self-repairing microcapsule comprises the following steps: 15g of epoxy acrylate, 15g of linseed oil, 90g of methylene chloride and 3.6g of 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide are mixed to be used as an oil phase, then the mixture is poured into 300mL of a polyvinyl alcohol aqueous solution with the mass fraction of 1wt%, an emulsion is obtained after stirring the mixture for 60min at the speed of 600r/min, then stirring is carried out for 12h at the temperature of 40 ℃, methylene chloride is removed, 40mL of a sodium p-styrenesulfonate aqueous solution with the mass fraction of 10wt% is added to the emulsion, stirring is carried out for 30min, the emulsion is placed under an ultraviolet light curing oven for 20min, after the reaction is completed, washing with water and drying at room temperature are carried out to obtain sulfonated polyacrylate microcapsules, 30g of sulfonated polyacrylate microcapsules are dispersed in 2.5g of purified aniline dropwise, after stirring the mixture solution for 0.5h in an ice bath, 100mL of an ammonium persulfate aqueous solution with the mass fraction of 6wt% is added to initiate polymerization, and self-repairing microcapsules are obtained.
A preparation method of a photocatalysis self-repairing aluminum veneer is characterized by comprising the following steps: comprises the following steps:
(1) Firstly, mixing the primer layer, the external force repair layer and the corrosion repair layer according to the proportion for standby;
(2) Polishing and flattening the surface of the aluminum veneer by using sand paper, degreasing by using a degreasing agent, cleaning by using acetone and clear water, and drying for later use;
(3) The method comprises the steps of firstly spraying a primer layer by using a high-voltage electrostatic spray gun, continuously spraying an external force repair layer by using the high-voltage electrostatic spray gun after the primer layer is placed and volatilized for 5-6 minutes at room temperature, drying and solidifying for 10-15 minutes at 190-230 ℃ after the primer layer is placed and volatilized for 5-6 minutes at room temperature, spraying a corrosion repair layer by using an electric spraying machine after cooling is finished, and obtaining the self-repairing weather-resistant aluminum veneer after spraying is finished at 75-85 ℃.
In summary, the invention has the following beneficial effects:
after the corrosion repair layer of the outer layer is damaged, on one hand, linseed oil in the microcapsule is released to repair the coating, and on the other hand, the photo-thermal effect of polyaniline can rapidly improve the surface temperature of the coating to reach the glass transition temperature, so that the scratch of the coating is closed.
The ferroferric oxide nano particles in the external force repairing layer are dispersed in the thermosetting acrylic resin, natural light is absorbed through the aniline black particles, so that a photo-thermal effect is generated, and defects at damaged positions can be effectively repaired in situ.
Detailed Description
The following detailed description of the invention further illustrates, but is not to be construed as limiting, the invention.
Example 1
The preparation method of the ferroferric oxide nano-particles comprises the following steps: dissolving ferric chloride hexahydrate in deionized water at normal temperature, adding excessive Na under nitrogen protection 2 SO 3 Stirring the solution by magnetic force for 20min, and rapidly addingAdding 25-28% of concentrated ammonia water by mass percent, quickly blackening the solution, reacting for 30min in an oil bath at 60 ℃, and then dropwise adding citric acid, wherein the mass volume ratio of ferric chloride hexahydrate, citric acid and concentrated ammonia water is 21g: 0.5-0.7 g: 5-10 ml, regulating the temperature value to 80 ℃, reacting for 1h, cooling the room temperature, settling the magnetic balls, cleaning the magnetic balls for a plurality of times by using acetone and deionized water, and then performing ultrasonic dispersion in the deionized water to obtain stable magnetic ferroferric oxide nano particles.
Example 2
The preparation method of the self-repairing microcapsule comprises the following steps: 15g of epoxy acrylate, 15g of linseed oil, 90g of methylene chloride and 3.6g of 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide are mixed to be used as an oil phase, then the mixture is poured into 300mL of a polyvinyl alcohol aqueous solution with the mass fraction of 1wt%, an emulsion is obtained after stirring the mixture for 60min at the speed of 600r/min, then stirring is carried out for 12h at the temperature of 40 ℃, methylene chloride is removed, 40mL of a sodium p-styrenesulfonate aqueous solution with the mass fraction of 10wt% is added to the emulsion, stirring is carried out for 30min, the emulsion is placed under an ultraviolet light curing oven for 20min, after the reaction is completed, washing with water and drying at room temperature are carried out to obtain sulfonated polyacrylate microcapsules, 30g of sulfonated polyacrylate microcapsules are dispersed in 2.5g of purified aniline dropwise, after stirring the mixture solution for 0.5h in an ice bath, 100mL of an ammonium persulfate aqueous solution with the mass fraction of 6wt% is added to initiate polymerization, and self-repairing microcapsules are obtained.
Example 3
A self-repairing photo-catalytic aluminium veneer comprises a substrate and a coating layer coated on the upper layer of the substrate, wherein the coating layer comprises a primer layer, an external force repairing layer and a corrosion repairing layer from inside to outside.
The primer layer is composed of the following components in parts by weight: 20 parts of aqueous epoxy resin, 2 parts of amino resin, 1 part of epoxy phosphate, 6 parts of titanium dioxide and 1 part of N, N' -vinyl bis stearamide.
The external force repairing layer is composed of the following components in parts by weight: 3 pieces of nigrosine particles, 21 parts of ferroferric oxide nano particles, 41 parts of thermosetting acrylic resin and 10 parts of acetylacetone.
The corrosion repair layer is composed of the following components in parts by weight: 8 parts of self-repairing microcapsule, 30 parts of aqueous epoxy resin, 5 parts of aqueous epoxy hardener LLG-119 and 3 parts of tetrapentaerythritol ester.
A preparation method of a photocatalysis self-repairing aluminum veneer comprises the following steps:
(1) Firstly, mixing the primer layer, the external force repair layer and the corrosion repair layer according to the proportion for standby.
(2) Polishing and flattening the surface of the aluminum veneer by using sand paper, degreasing by using a degreasing agent, cleaning by using acetone and clear water, and drying for later use.
(3) The primer layer is sprayed by a high-voltage electrostatic spray gun, the high-voltage electrostatic spray gun is used for continuously spraying the external force repairing layer after the high-voltage electrostatic spray gun is placed and volatilized for 5 minutes at room temperature, the high-voltage electrostatic spray gun is used for drying and solidifying for 10 minutes at 190 ℃ after the high-voltage electrostatic spray gun is placed and volatilized for 5 minutes at room temperature, the corrosion repairing layer is sprayed by an electric spraying machine after cooling is finished, the spraying temperature is 75 ℃, and the self-repairing weather-resistant aluminum veneer is obtained after the spraying is finished.
Example 4
A self-repairing photo-catalytic aluminium veneer comprises a substrate and a coating layer coated on the upper layer of the substrate, wherein the coating layer comprises a primer layer, an external force repairing layer and a corrosion repairing layer from inside to outside.
The primer layer is composed of the following components in parts by weight: 25 parts of aqueous epoxy resin, 4 parts of amino resin, 1 part of epoxy phosphate, 7 parts of titanium dioxide and 2 parts of methylphenyl polysiloxane.
The external force repairing layer is composed of the following components in parts by weight: 4 pieces of nigrosine particles, 30 parts of ferroferric oxide nano particles, 45 parts of thermosetting acrylic resin and 13 parts of acetylacetone.
The corrosion repair layer is composed of the following components in parts by weight: 10 parts of self-repairing microcapsule, 34 parts of aqueous epoxy resin and 5 parts of secondary diarylamines, wherein the aqueous epoxy hardener WG-828 is 7 parts.
A preparation method of a photocatalysis self-repairing aluminum veneer comprises the following steps:
(1) Firstly, mixing the primer layer, the external force repair layer and the corrosion repair layer according to the proportion for standby.
(2) Polishing and flattening the surface of the aluminum veneer by using sand paper, degreasing by using a degreasing agent, cleaning by using acetone and clear water, and drying for later use.
(3) The primer layer is sprayed by a high-voltage electrostatic spray gun, the high-voltage electrostatic spray gun is used for continuously spraying the external force repairing layer after the high-voltage electrostatic spray gun is placed and volatilized for 6 minutes at room temperature, the high-voltage electrostatic spray gun is used for drying and solidifying for 12 minutes at 210 ℃ after the high-voltage electrostatic spray gun is placed and volatilized for 5 minutes at room temperature, the corrosion repairing layer is sprayed by an electric spraying machine after cooling is finished, the spraying temperature is 80 ℃, and the self-repairing weather-resistant aluminum veneer is obtained after the spraying is finished.
Example 5
A self-repairing photo-catalytic aluminium veneer comprises a substrate and a coating layer coated on the upper layer of the substrate, wherein the coating layer comprises a primer layer, an external force repairing layer and a corrosion repairing layer from inside to outside.
The primer layer is composed of the following components in parts by weight: 28 parts of waterborne epoxy resin, 5 parts of amino resin, 2 parts of epoxy phosphate, 8 parts of titanium dioxide and 2 parts of sodium hexametaphosphate.
The external force repairing layer is composed of the following components in parts by weight: 5 pieces of nigrosine particles, 35 parts of ferroferric oxide nano particles, 48 parts of thermosetting acrylic resin and 16 parts of acetylacetone.
The corrosion repair layer is composed of the following components in parts by weight: 12 parts of self-repairing microcapsule, 38 parts of aqueous epoxy resin, 8 parts of aqueous epoxy curing agent K-19 and 7 parts of p-phenylenediamine.
A preparation method of a photocatalysis self-repairing aluminum veneer comprises the following steps:
(1) Firstly, mixing the primer layer, the external force repair layer and the corrosion repair layer according to the proportion for standby.
(2) Polishing and flattening the surface of the aluminum veneer by using sand paper, degreasing by using a degreasing agent, cleaning by using acetone and clear water, and drying for later use.
(3) The primer layer is sprayed by a high-voltage electrostatic spray gun, the high-voltage electrostatic spray gun is used for continuously spraying the external force repairing layer after the high-voltage electrostatic spray gun is placed and volatilized for 6 minutes at room temperature, the high-voltage electrostatic spray gun is used for drying and solidifying for 15 minutes at 230 ℃ after the high-voltage electrostatic spray gun is placed and volatilized for 6 minutes at room temperature, the corrosion repairing layer is sprayed by an electric spraying machine after cooling is finished, the self-repairing weather-resistant aluminum veneer is obtained after the spraying is finished at 85 ℃.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention, and those skilled in the art may make various modifications and equivalents within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the technical solution of the present invention.
Claims (8)
1. The photocatalysis self-repairing aluminum veneer is characterized by comprising a substrate and a coating coated on the upper layer of the substrate, wherein the coating comprises a primer layer, an external force repairing layer and a corrosion repairing layer from inside to outside;
the primer layer is composed of the following components in parts by weight: 20-28 parts of waterborne epoxy resin, 2-5 parts of amino resin, 1-2 parts of epoxy phosphate, 6-8 parts of titanium dioxide and 1-2 parts of dispersing agent;
the external force repairing layer is composed of the following components in parts by weight: 3-5 pieces of nigrosine particles, 21-35 parts of ferroferric oxide nano particles, 41-48 parts of thermosetting acrylic resin and 10-16 parts of acetylacetone;
the corrosion repair layer is composed of the following components in parts by weight: 8-12 parts of self-repairing microcapsule, 30-38 parts of aqueous epoxy resin, 5-8 parts of curing agent and 3-7 parts of antioxidant.
2. The photocatalytic self-repairing aluminum veneer according to claim 1, characterized in that: the dispersing agent is selected from one of N, N' -vinyl bis-stearamide, methyl phenyl polysiloxane and sodium hexametaphosphate.
3. The photocatalytic self-repairing aluminum veneer according to claim 1, characterized in that: the preparation method of the ferroferric oxide nano-particles comprises the following steps: dissolving ferric chloride hexahydrate in deionized water at normal temperature, adding excessive Na under nitrogen protection 2 SO 3 Magnetically stirring the solution for 20min, quickly adding 25-28% of concentrated ammonia water, quickly blackening the solution, reacting in an oil bath at 60 ℃ for 30min, then dropwise adding citric acid, adjusting the temperature to 80 ℃ for 1h, cooling the room temperature, settling the magnetic balls, washing the magnetic balls with acetone and deionized water for several times, and then removing the magnetic ballsAnd carrying out ultrasonic dispersion in the sub-water to obtain stable ferroferric oxide nano particles with magnetism.
4. The photocatalytic self-repairing aluminum veneer according to claim 1, characterized in that: the mass volume ratio of the ferric chloride hexahydrate, the citric acid and the concentrated ammonia water is 21g: 0.5-0.7 g: 5-10 ml.
5. The photocatalytic self-repairing aluminum veneer according to claim 1, characterized in that: the curing agent is one of aqueous epoxy curing agent LLG-119, aqueous epoxy curing agent WG-828 and aqueous epoxy curing agent K-19.
6. The photocatalytic self-repairing aluminum veneer according to claim 1, characterized in that: the antioxidant is selected from one of tetrapentaerythritol ester, secondary diarylamines, p-phenylenediamine and ketoamine.
7. The photocatalytic self-repairing aluminum veneer according to claim 1, characterized in that: the preparation method of the self-repairing microcapsule comprises the following steps: 15g of epoxy acrylate, 15g of linseed oil, 90g of methylene chloride and 3.6g of 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide are mixed to be used as an oil phase, then the mixture is poured into 300mL of a polyvinyl alcohol aqueous solution with the mass fraction of 1wt%, an emulsion is obtained after stirring the mixture for 60min at the speed of 600r/min, then stirring is carried out for 12h at the temperature of 40 ℃, methylene chloride is removed, 40mL of a sodium p-styrenesulfonate aqueous solution with the mass fraction of 10wt% is added to the emulsion, stirring is carried out for 30min, the emulsion is placed under an ultraviolet light curing oven for 20min, after the reaction is completed, washing with water and drying at room temperature are carried out to obtain sulfonated polyacrylate microcapsules, 30g of sulfonated polyacrylate microcapsules are dispersed in 2.5g of purified aniline dropwise, after stirring the mixture solution for 0.5h in an ice bath, 100mL of an ammonium persulfate aqueous solution with the mass fraction of 6wt% is added to initiate polymerization, and self-repairing microcapsules are obtained.
8. A preparation method of a photocatalysis self-repairing aluminum veneer is characterized by comprising the following steps: comprises the following steps:
(1) Firstly, mixing the primer layer, the external force repair layer and the corrosion repair layer according to the proportion for standby;
(2) Polishing and flattening the surface of the aluminum veneer by using sand paper, degreasing by using a degreasing agent, cleaning by using acetone and clear water, and drying for later use;
(3) The method comprises the steps of firstly spraying a primer layer by using a high-voltage electrostatic spray gun, continuously spraying an external force repair layer by using the high-voltage electrostatic spray gun after the primer layer is placed and volatilized for 5-6 minutes at room temperature, drying and solidifying for 10-15 minutes at 190-230 ℃ after the primer layer is placed and volatilized for 5-6 minutes at room temperature, spraying a corrosion repair layer by using an electric spraying machine after cooling is finished, and obtaining the self-repairing weather-resistant aluminum veneer after spraying is finished at 75-85 ℃.
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| CN102391736A (en) * | 2011-07-25 | 2012-03-28 | 苏州金近幕墙有限公司 | Self-cleaning coating used for building curtain wall aluminum veneer and preparation method thereof |
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| CN115505332A (en) * | 2022-08-30 | 2022-12-23 | 江南大学 | A self-healing anticorrosion coating containing polyaniline double-layer microcapsules |
| CN115678357A (en) * | 2022-11-23 | 2023-02-03 | 江苏美诺斯建材科技有限公司 | Self-repairing weather-resistant aluminum veneer and preparation method thereof |
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