Environmentally friendly and easy-to-clean curtain wall aluminum veneer and its processing technology

Abstract

The present invention discloses an environmentally friendly and easy-to-clean curtain wall aluminum veneer and a processing technology thereof, and relates to the technical field of aluminum veneers. The present invention sprays a layer of antifouling coating on the surface of an aluminum alloy panel, thereby improving the easy-to-clean performance of the curtain wall aluminum veneer. The antifouling coating contains antifouling microcapsules, which have a core-shell microcapsule structure, with tung oil as the core material and calcium alginate as the capsule wall. Heptafluorodecyltriethoxysilane-modified nano-silica is also added to the antifouling microcapsules, which further enhances the hydrophobicity of the microcapsules, so that the curtain wall aluminum veneer has good easy-to-clean and corrosion-resistant performance. Tung oil-modified phenolic resin is also added to the coating of the present invention, and the resin is modified by using tung oil, and tung oil acid molecules are introduced into the phenolic resin. The tung oil acid molecules are polymerized to form a water-resistant surface on the surface of the aluminum veneer, which further enhances the corrosion resistance and easy-to-clean performance of the curtain wall aluminum veneer.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum veneers, in particular to an environmentally friendly and easy-to-clean curtain wall aluminum veneer and a processing technology thereof. Background Art

[0002] With the continuous advancement of urbanization, the durability, environmental protection, easy cleaning and corrosion resistance of building curtain wall materials are increasingly valued. As a new type of building exterior wall decoration material, aluminum veneer is widely used in various types of building curtain walls, interior and exterior decoration, and facades of public facilities due to its advantages such as light weight, high strength and strong plasticity. Although traditional aluminum veneer surface treatment technologies such as spraying and anodizing can provide certain protection, dust and stains are easily accumulated on its surface, and it is difficult to clean, especially in seriously polluted urban environments, and the cleaning and maintenance costs are high. Secondly, with the changes in the use environment and the continuous use of buildings, the curtain wall aluminum veneer is exposed to external environmental factors such as air pollution, ultraviolet radiation, acid rain, and sandstorms for a long time, and its surface is prone to pollution, corrosion, fading and aging, which affects its aesthetics and service life. Therefore, the development of an environmentally friendly, easy-to-clean and corrosion-resistant curtain wall aluminum veneer has become the key to improving the performance of building facade decoration materials.

[0003] In summary, in order to solve the above problems, the present invention provides an environmentally friendly and easy-to-clean curtain wall aluminum veneer and a processing technology thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a method to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A processing technology for an environmentally friendly and easy-to-clean curtain wall aluminum veneer comprises the following steps:

[0007] Step 1: Stir polyurethane, tung oil modified phenolic resin, N, N'-(4, 4'-methylenediphenyl) bismaleimide and isothiazolinone to obtain a mixture;

[0008] Step 2: Take antifouling microcapsules and N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 2-3 hours to obtain an antifouling coating;

[0009] Step three: select an aluminum alloy panel and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum veneer blank; spray antifouling paint on the surface of the aluminum veneer blank and dry it to obtain an environmentally friendly and easy-to-clean curtain wall aluminum veneer.

[0010] More optimally, the preparation method of the tung oil modified phenolic resin is: take phenol and p-toluenesulfonic acid, stir evenly, add tung oil, heat to 104-105°C, react for 2-3h, cool to 45-50°C, add formaldehyde solution, add barium hydroxide, adjust the pH value, heat to 95-98°C, react for 3-5h, and obtain tung oil modified phenolic resin.

[0011] More optimally, barium hydroxide is added to adjust the pH value to 8.5.

[0012] More optimally, the preparation method of the antifouling microcapsules is: take anhydrous calcium chloride and deionized water, stir evenly to obtain a calcium chloride solution; take sodium alginate and deionized water, stir evenly to obtain a sodium alginate solution; take tung oil and OP-10 emulsifier, add them to the sodium alginate solution, stir for 5-10 minutes, add hydrophobically modified nano-silica, stir for 5-10 minutes, and obtain an emulsion; spray the emulsion into the calcium chloride solution, filter, wash, and dry to obtain the antifouling microcapsules.

[0013] More optimally, the preparation method of the hydrophobically modified nano-silica is: take nano-silica and heptadecafluorodecyltriethoxysilane, add them to an ethanol aqueous solution, stir evenly, and then perform ball milling hydrolysis for 50-70 minutes to obtain the hydrophobically modified nano-silica.

[0014] More optimally, in step 1, the mixture includes the following components, by weight: 100-110 parts of polyurethane, 10-13 parts of tung oil modified phenolic resin, 25-30 parts of N, N'-(4, 4'-methylenediphenyl) bismaleimide, and 2-3 parts of isothiazolinone.

[0015] More optimally, the preparation method of the polyurethane is: take toluene-2,4-diisocyanate, heat it to 85-95°C, introduce nitrogen, add polytetrahydrofuran diol, react at 50-55°C for 30-40min, add hydroxypropyl silicone oil dropwise, heat it to 80-85°C, react for 2-4h, cool it to 25-30°C, and obtain a prepolymer; take the prepolymer, add 2,5-furan dimethanol and tetrahydrofuran, and react at 70-75°C for 5-7h to obtain polyurethane.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention sprays a layer of antifouling paint on the surface of the aluminum alloy panel, thereby improving the easy-to-clean performance of the curtain wall aluminum veneer. The antifouling paint contains antifouling microcapsules, which have a core-shell microcapsule structure, with tung oil as the core material and calcium alginate as the capsule wall. Modified nano-silicon dioxide is also added to the antifouling microcapsules of the present invention, and the addition of modified nano-silicon dioxide enhances the corrosion resistance of the curtain wall aluminum veneer. Heptafluorodecyl triethoxysilane is used to modify the nano-silicon dioxide, which enhances the hydrophobicity of the microcapsules, so that the curtain wall aluminum veneer has good hydrophobicity, easy cleaning, and corrosion resistance.

[0018] 2. Tung oil-modified phenolic resin is also added to the coating of the present invention. The resin is modified by tung oil, and tung oil acid molecules are introduced into the phenolic resin. The tung oil acid molecules are polymerized to form a water-resistant surface on the surface of the aluminum veneer, further enhancing the corrosion resistance and easy cleaning performance of the curtain wall aluminum veneer.

[0019] 3. The tung oil-modified phenolic resin and the antifouling microcapsules in the coating of the present invention both contain tung oil, so the antifouling microcapsules have better compatibility and dispersibility in the coating matrix, and the curtain wall aluminum veneer is easier to clean and has better corrosion resistance. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The substances and sources involved in the present invention are not specifically limited, and exemplarily include: aluminum alloy panel from Mingtai Aluminum, model 8011; nano-silicon dioxide: particle size: 200nm, model 748161, which can be purchased from Merck; polytetramethylene glycol: PTMG2000, which can be purchased from Guangzhou Haoyi New Materials Technology Co., Ltd.; hydroxypropyl silicone oil: model: YLD-WSS140, which can be purchased from Shandong Yonglida New Materials Technology Co., Ltd.; epoxy resin: model: E51.

[0022] Embodiment 1: A processing technology for an environmentally friendly and easy-to-clean curtain wall aluminum veneer comprises the following steps:

[0023] Step 1: Preparation of hydrophobically modified nano-silica:

[0024] Take 5g of nano-silica and 0.5g of heptadecafluorodecyltriethoxysilane, add them to 10mL of ethanol aqueous solution, stir evenly, and then perform ball milling hydrolysis for 60min to obtain hydrophobically modified nano-silica;

[0025] Step 2: Preparation of antifouling microcapsules:

[0026] Take 10g of anhydrous calcium chloride and 100mL of deionized water, stir evenly to obtain a calcium chloride solution; take 0.5g of sodium alginate and 100mL of deionized water, stir evenly to obtain a sodium alginate solution; take 1.2g of tung oil and 0.1g of OP-10 emulsifier, add them to the sodium alginate solution, stir for 8min, add hydrophobically modified nano-silica, stir for 8min to obtain an emulsion; spray the emulsion into the calcium chloride solution, filter, wash and dry to obtain antifouling microcapsules;

[0027] Step 3: Preparation of tung oil modified phenolic resin:

[0028] Take 500g phenol and 6g p-toluenesulfonic acid, stir evenly, add 65g tung oil, heat to 104°C, react for 2.5h, cool to 48°C, add 500g formaldehyde solution, add barium hydroxide, adjust the pH to 8.5, heat to 96°C, react for 4h, and obtain tung oil modified phenolic resin;

[0029] Step 4: Preparation of antifouling coating, including the following steps:

[0030] S1: Take 175g toluene-2,4-diisocyanate, heat to 90°C, introduce nitrogen, add 122g polytetrahydrofuran diol, react at 52°C for 35min, drop 50g hydroxypropyl silicone oil, heat to 82°C, react for 3h, cool to 28°C to obtain a prepolymer; take the prepolymer, add 47g 2,5-furan dimethanol and 100mL tetrahydrofuran, react at 72°C for 6h to obtain a polyurethane;

[0031] S2: Stirring polyurethane, phenolic resin, N, N'-(4, 4'-methylenediphenyl)bismaleimide and isothiazolinone to obtain a mixture;

[0032] The mixture includes the following components, by weight: 105 parts of polyurethane, 12 parts of tung oil modified phenolic resin, 28 parts of N, N'-(4, 4'-methylenediphenyl) bismaleimide, and 2.5 parts of isothiazolinone;

[0033] S3: Take 1.5g of antifouling microcapsules and 15mL of N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 2.5h to obtain an antifouling coating;

[0034] Step 5: Select an aluminum alloy panel with a thickness of 10 mm and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum single plate blank; spray anti-fouling paint on the surface of the aluminum single plate blank with a spraying thickness of 1 mm, and then dry it at 200°C for 5 minutes to obtain an environmentally friendly and easy-to-clean curtain wall aluminum single plate.

[0035] Embodiment 2: A processing technology for an environmentally friendly and easy-to-clean curtain wall aluminum veneer comprises the following steps:

[0036] Step 1: Preparation of hydrophobically modified nano-silica:

[0037] Take 5g of nano-silica and 0.5g of heptadecafluorodecyltriethoxysilane, add them to 10mL of ethanol aqueous solution, stir evenly, and then perform ball milling and hydrolysis for 50min to obtain hydrophobically modified nano-silica;

[0038] Step 2: Preparation of antifouling microcapsules:

[0039] Take 10g of anhydrous calcium chloride and 100mL of deionized water, stir evenly to obtain a calcium chloride solution; take 0.5g of sodium alginate and 100mL of deionized water, stir evenly to obtain a sodium alginate solution; take 1.2g of tung oil and 0.1g of OP-10 emulsifier, add them to the sodium alginate solution, stir for 5min, add hydrophobically modified nano-silica, stir for 5min to obtain an emulsion; spray the emulsion into the calcium chloride solution, filter, wash and dry to obtain antifouling microcapsules;

[0040] Step 3: Preparation of tung oil modified phenolic resin:

[0041] Take 500g phenol and 6g p-toluenesulfonic acid, stir evenly, add 65g tung oil, heat to 104°C, react for 2h, cool to 45°C, add 500g formaldehyde solution, add barium hydroxide, adjust the pH to 8.5, heat to 95°C, react for 3h, and obtain tung oil modified phenolic resin;

[0042] Step 4: Preparation of antifouling coating, including the following steps:

[0043] S1: Take 175g of toluene-2,4-diisocyanate, heat it to 85°C, introduce nitrogen, add 122g of polytetrahydrofuran diol, react at 50°C for 30min, drop 50g of hydroxypropyl silicone oil, heat it to 80°C, react for 2h, cool to 25°C to obtain a prepolymer; take the prepolymer, add 47g of 2,5-furan dimethanol and 100mL of tetrahydrofuran, react at 70°C for 5h to obtain a polyurethane;

[0044] S2: Stirring polyurethane, phenolic resin, N, N'-(4, 4'-methylenediphenyl)bismaleimide and isothiazolinone to obtain a mixture;

[0045] The mixture includes the following components, by weight: 100 parts of polyurethane, 10 parts of tung oil modified phenolic resin, 25 parts of N, N'-(4, 4'-methylenediphenyl) bismaleimide, and 2 parts of isothiazolinone;

[0046] S3: Take 1.5g of antifouling microcapsules and 15mL of N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 2h to obtain an antifouling coating;

[0047] Step 5: Select an aluminum alloy panel with a thickness of 10 mm and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum single plate blank; spray anti-fouling paint on the surface of the aluminum single plate blank with a spraying thickness of 1 mm, and then dry it at 200°C for 5 minutes to obtain an environmentally friendly and easy-to-clean curtain wall aluminum single plate.

[0048] Embodiment 3: A processing technology for an environmentally friendly and easy-to-clean curtain wall aluminum veneer comprises the following steps:

[0049] Step 1: Preparation of hydrophobically modified nano-silica:

[0050] Take 5g of nano-silica and 0.5g of heptadecafluorodecyltriethoxysilane, add them to 10mL of ethanol aqueous solution, stir evenly, and then perform ball milling hydrolysis for 70min to obtain hydrophobically modified nano-silica;

[0051] Step 2: Preparation of antifouling microcapsules:

[0052] Take 10g of anhydrous calcium chloride and 100mL of deionized water, stir evenly to obtain a calcium chloride solution; take 0.5g of sodium alginate and 100mL of deionized water, stir evenly to obtain a sodium alginate solution; take 1.2g of tung oil and 0.1g of OP-10 emulsifier, add them to the sodium alginate solution, stir for 10min, add hydrophobically modified nano-silica, stir for 10min to obtain an emulsion; spray the emulsion into the calcium chloride solution, filter, wash and dry to obtain antifouling microcapsules;

[0053] Step 3: Preparation of tung oil modified phenolic resin:

[0054] Take 500g phenol and 6g p-toluenesulfonic acid, stir evenly, add 65g tung oil, heat to 105°C, react for 3h, cool to 50°C, add 500g formaldehyde solution, add barium hydroxide, adjust the pH to 8.5, heat to 98°C, react for 5h, and obtain tung oil modified phenolic resin;

[0055] Step 4: Preparation of antifouling coating, including the following steps:

[0056] S1: Take 175g of toluene-2,4-diisocyanate, heat it to 95°C, introduce nitrogen, add 122g of polytetrahydrofuran diol, react at 55°C for 40min, drop 50g of hydroxypropyl silicone oil, heat it to 85°C, react for 4h, cool to 30°C to obtain a prepolymer; take the prepolymer, add 47g of 2,5-furan dimethanol and 100mL of tetrahydrofuran, react at 75°C for 7h to obtain a polyurethane;

[0057] S2: Stirring polyurethane, phenolic resin, N, N'-(4, 4'-methylenediphenyl)bismaleimide and isothiazolinone to obtain a mixture;

[0058] The mixture includes the following components, by weight: 110 parts of polyurethane, 13 parts of tung oil modified phenolic resin, 30 parts of N, N'-(4, 4'-methylenediphenyl) bismaleimide, and 3 parts of isothiazolinone;

[0059] S3: Take 1.5g of antifouling microcapsules and 15mL of N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 3h to obtain an antifouling coating;

[0060] Step 5: Select an aluminum alloy panel with a thickness of 10 mm and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum single plate blank; spray anti-fouling paint on the surface of the aluminum single plate blank with a spraying thickness of 1 mm, and then dry it at 200°C for 5 minutes to obtain an environmentally friendly and easy-to-clean curtain wall aluminum single plate.

[0061] Comparative Example 1: No nano-silicon dioxide is added, and the rest is the same as Example 1:

[0062] Step 1: Preparation of antifouling microcapsules:

[0063] Take 10g of anhydrous calcium chloride and 100mL of deionized water, stir evenly to obtain a calcium chloride solution; take 0.5g of sodium alginate and 100mL of deionized water, stir evenly to obtain a sodium alginate solution; take 1.2g of tung oil and 0.1g of OP-10 emulsifier, add them to the sodium alginate solution, stir for 8min to obtain an emulsion; spray the emulsion into the calcium chloride solution, filter, wash and dry to obtain antifouling microcapsules;

[0064] Step 2: Preparation of tung oil modified phenolic resin:

[0065] Take 500g phenol and 6g p-toluenesulfonic acid, stir evenly, add 65g tung oil, heat to 104°C, react for 2.5h, cool to 48°C, add 500g formaldehyde solution, add barium hydroxide, adjust the pH to 8.5, heat to 96°C, react for 4h, and obtain tung oil modified phenolic resin;

[0066] Step 3: Preparation of antifouling coating, comprising the following steps:

[0067] S1: Take 175g toluene-2,4-diisocyanate, heat to 90°C, introduce nitrogen, add 122g polytetrahydrofuran diol, react at 52°C for 35min, drop 50g hydroxypropyl silicone oil, heat to 82°C, react for 3h, cool to 28°C to obtain a prepolymer; take the prepolymer, add 47g 2,5-furan dimethanol and 100mL tetrahydrofuran, react at 72°C for 6h to obtain a polyurethane;

[0068] S2: Stirring polyurethane, phenolic resin, N, N'-(4, 4'-methylenediphenyl)bismaleimide and isothiazolinone to obtain a mixture;

[0069] The mixture includes the following components, by weight: 105 parts of polyurethane, 12 parts of tung oil modified phenolic resin, 28 parts of N, N'-(4, 4'-methylenediphenyl) bismaleimide, and 2.5 parts of isothiazolinone;

[0070] S3: Take 1.5g of antifouling microcapsules and 15mL of N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 2.5h to obtain an antifouling coating;

[0071] Step 4: Select an aluminum alloy panel with a thickness of 10 mm and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum single plate blank; spray anti-fouling paint on the surface of the aluminum single plate blank with a spraying thickness of 1 mm, and then dry it at 200°C for 5 minutes to obtain an environmentally friendly and easy-to-clean curtain wall aluminum single plate.

[0072] Comparative Example 2: No tung oil-modified phenolic resin was used, and the rest was the same as Example 1:

[0073] Step 1: Preparation of hydrophobically modified nano-silica:

[0074] Take 5g of nano-silica and 0.5g of heptadecafluorodecyltriethoxysilane, add them to 10mL of ethanol aqueous solution, stir evenly, and then perform ball milling hydrolysis for 60min to obtain hydrophobically modified nano-silica;

[0075] Step 2: Preparation of antifouling microcapsules:

[0076] Take 10g of anhydrous calcium chloride and 100mL of deionized water, stir evenly to obtain a calcium chloride solution; take 0.5g of sodium alginate and 100mL of deionized water, stir evenly to obtain a sodium alginate solution; take 1.2g of tung oil and 0.1g of OP-10 emulsifier, add them to the sodium alginate solution, stir for 8min, add hydrophobically modified nano-silica, stir for 8min to obtain an emulsion; spray the emulsion into the calcium chloride solution, filter, wash and dry to obtain antifouling microcapsules;

[0077] Step 3: Preparation of phenolic resin:

[0078] Take 500g of phenol and 6g of p-toluenesulfonic acid, stir evenly, heat to 104°C, react for 2.5h, cool to 48°C, add 500g of formaldehyde solution, add barium hydroxide, adjust the pH to 8.5, heat to 96°C, react for 4h, and obtain phenolic resin;

[0079] Step 4: Preparation of antifouling coating, including the following steps:

[0080] S1: Take 175g toluene-2,4-diisocyanate, heat to 90°C, introduce nitrogen, add 122g polytetrahydrofuran diol, react at 52°C for 35min, drop 50g hydroxypropyl silicone oil, heat to 82°C, react for 3h, cool to 28°C to obtain a prepolymer; take the prepolymer, add 47g 2,5-furan dimethanol and 100mL tetrahydrofuran, react at 72°C for 6h to obtain a polyurethane;

[0081] S2: Stirring polyurethane, phenolic resin, N, N'-(4, 4'-methylenediphenyl)bismaleimide and isothiazolinone to obtain a mixture;

[0082] The mixture includes the following components, by weight: 105 parts of polyurethane, 12 parts of phenolic resin, 28 parts of N, N'-(4, 4'-methylenediphenyl)bismaleimide, and 2.5 parts of isothiazolinone;

[0083] S3: Take 1.5g of antifouling microcapsules and 15mL of N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 2.5h to obtain an antifouling coating;

[0084] Step 5: Select an aluminum alloy panel with a thickness of 10 mm and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum single plate blank; spray anti-fouling paint on the surface of the aluminum single plate blank with a spraying thickness of 1 mm, and then dry it at 200°C for 5 minutes to obtain an environmentally friendly and easy-to-clean curtain wall aluminum single plate.

[0085] Comparative Example 3: The nano-silica was not modified by using heptadecafluorodecyltriethoxysilane, and the rest was the same as Example 1:

[0086] Step 1: Preparation of antifouling microcapsules:

[0087] Take 10g of anhydrous calcium chloride and 100mL of deionized water, stir evenly to obtain a calcium chloride solution; take 0.5g of sodium alginate and 100mL of deionized water, stir evenly to obtain a sodium alginate solution; take 1.2g of tung oil and 0.1g of OP-10 emulsifier, add them to the sodium alginate solution, stir for 8min, add nano-silicon dioxide, stir for 8min to obtain an emulsion; spray the emulsion into the calcium chloride solution, filter, wash and dry to obtain antifouling microcapsules;

[0088] Step 2: Preparation of tung oil modified phenolic resin:

[0089] Take 500g phenol and 6g p-toluenesulfonic acid, stir evenly, add 65g tung oil, heat to 104°C, react for 2.5h, cool to 48°C, add 500g formaldehyde solution, add barium hydroxide, adjust the pH to 8.5, heat to 96°C, react for 4h, and obtain tung oil modified phenolic resin;

[0090] Step 3: Preparation of antifouling coating, comprising the following steps:

[0091] S1: Take 175g toluene-2,4-diisocyanate, heat to 90°C, introduce nitrogen, add 122g polytetrahydrofuran diol, react at 52°C for 35min, drop 50g hydroxypropyl silicone oil, heat to 82°C, react for 3h, cool to 28°C to obtain a prepolymer; take the prepolymer, add 47g 2,5-furan dimethanol and 100mL tetrahydrofuran, react at 72°C for 6h to obtain a polyurethane;

[0092] S2: Stirring polyurethane, phenolic resin, N, N'-(4, 4'-methylenediphenyl)bismaleimide and isothiazolinone to obtain a mixture;

[0093] The mixture includes the following components, by weight: 105 parts of polyurethane, 12 parts of tung oil modified phenolic resin, 28 parts of N, N'-(4, 4'-methylenediphenyl) bismaleimide, and 2.5 parts of isothiazolinone;

[0094] S3: Take 1.5g of antifouling microcapsules and 15mL of N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 2.5h to obtain an antifouling coating;

[0095] Step 4: Select an aluminum alloy panel with a thickness of 10 mm and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum single plate blank; spray anti-fouling paint on the surface of the aluminum single plate blank with a spraying thickness of 1 mm, and then dry it at 200°C for 5 minutes to obtain an environmentally friendly and easy-to-clean curtain wall aluminum single plate.

[0096] experiment:

[0097] The environmentally friendly and easy-to-clean curtain wall aluminum veneers prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were tested for performance, and the static water contact angle of the coating film was detected using a contact angle meter, and the water droplet was about 5 μL; the environmentally friendly and easy-to-clean curtain wall aluminum veneer was cut into 150 mm × 150 mm × 1 mm specimens, and then placed in a salt spray box at 35°C, the sodium chloride concentration was 55 g / L, the pH was 7.0, and the surface corrosion resistance of the environmentally friendly and easy-to-clean curtain wall aluminum veneer was recorded. The data obtained are as follows:

[0098]

[0099] Conclusion: From the comparison of the data in the table, it can be seen that in Example 1, nano-silica is not added, the corrosion resistance of the antifouling coating is greatly reduced, the hydrophobicity of the coating is deteriorated, and the water contact angle is reduced. In Example 2, tung oil-modified phenolic resin is not used. At this time, the density of the water-resistant coating on the surface of the aluminum veneer decreases, and the corrosion resistance of the curtain wall aluminum veneer is also affected. In Example 3, nano-silica modified with heptadecafluorodecyltriethoxysilane is not used, and the corrosion resistance of the wall aluminum veneer decreases and the hydrophobicity becomes worse. In Examples 1 to 3 of the present invention, a layer of antifouling coating is sprayed on the surface of the aluminum alloy panel, which improves the easy-to-clean performance of the curtain wall aluminum veneer. The antifouling coating contains antifouling microcapsules, which have a core-shell microcapsule structure, with tung oil as the core material and calcium alginate as the capsule wall. Heptadecafluorodecyltriethoxysilane-modified nano-silica is also added to the antifouling microcapsules, which further enhances the hydrophobicity of the microcapsules, so that the curtain wall aluminum veneer has good easy-to-clean and corrosion-resistant properties. The coating of the present invention also adds tung oil-modified phenolic resin, which is modified by tung oil, and tung oil acid molecules are introduced into the phenolic resin. The tung oil acid molecules are polymerized to form a water-resistant surface on the surface of the aluminum veneer, further enhancing the corrosion resistance and easy-to-clean performance of the curtain wall aluminum veneer.

[0100] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A processing technology for environmentally friendly and easy-to-clean curtain wall aluminum veneer, characterized by: The following steps are involved: Step 1: Stir polyurethane, tung oil modified phenolic resin, N, N'-(4, 4'-methylenediphenyl) bismaleimide and isothiazolinone to obtain a mixture; Step 2: Take antifouling microcapsules and N, N-dimethylformamide, and perform ultrasonic dispersion to obtain an antifouling microcapsule solution; add the antifouling microcapsule solution to the mixture, and stir for 2-3 hours to obtain an antifouling coating; Step 3: Select an aluminum alloy panel and perform sheet metal processing on it. After the processing is completed, perform surface degreasing and pickling passivation treatment processes to obtain an aluminum single plate blank; spray an antifouling coating on the surface of the aluminum single plate blank, dry it, and obtain an environmentally friendly and easy-to-clean curtain wall aluminum single plate; The preparation method of the antifouling microcapsule comprises the following steps: taking anhydrous calcium chloride and deionized water, stirring evenly to obtain a calcium chloride solution; taking sodium alginate and deionized water, stirring evenly to obtain a sodium alginate solution; taking tung oil and OP-10 emulsifier, adding them to the sodium alginate solution, stirring for 5-10 minutes, adding hydrophobically modified nano-silicon dioxide, stirring for 5-10 minutes, and obtaining an emulsion; spraying the emulsion into the calcium chloride solution, filtering, washing, and drying to obtain the antifouling microcapsule; The preparation method of the hydrophobically modified nano-silica is as follows: nano-silica and heptadecafluorodecyltriethoxysilane are added into an ethanol aqueous solution, stirred evenly, and then ball-milled and hydrolyzed for 50-70 minutes to obtain the hydrophobically modified nano-silica.

2. The processing technology of the environmentally friendly and easy-to-clean curtain wall aluminum veneer according to claim 1 is characterized by: The preparation method of the tung oil modified phenolic resin is as follows: phenol and p-toluenesulfonic acid are taken, stirred evenly, tung oil is added, the temperature is raised to 104-105° C., reacted for 2-3 hours, cooled to 45-50° C., formaldehyde solution is added, barium hydroxide is added, the pH value is adjusted, the temperature is raised to 95-98° C., reacted for 3-5 hours, and the tung oil modified phenolic resin is obtained.

3. The processing technology of the environmentally friendly and easy-to-clean curtain wall aluminum veneer according to claim 2 is characterized by: Add barium hydroxide and adjust the pH to 8.

5.

4. The processing technology of the environmentally friendly and easy-to-clean curtain wall aluminum veneer according to claim 1 is characterized by: In step 1, the mixture includes the following components, by weight: 100-110 parts of polyurethane, 10-13 parts of tung oil modified phenolic resin, 25-30 parts of N, N'-(4, 4'-methylenediphenyl) bismaleimide, and 2-3 parts of isothiazolinone.

5. The processing technology of the environmentally friendly and easy-to-clean curtain wall aluminum veneer according to claim 4 is characterized by: The preparation method of the polyurethane comprises the following steps: taking toluene-2,4-diisocyanate, heating to 85-95° C., introducing nitrogen, adding polytetrahydrofuran diol, reacting at 50-55° C. for 30-40 min, dropping hydroxypropyl silicone oil, heating to 80-85° C., reacting for 2-4 h, cooling to 25-30° C., and obtaining a prepolymer; taking the prepolymer, adding 2,5-furan dimethanol and tetrahydrofuran, and reacting at 70-75° C. for 5-7 h to obtain the polyurethane.

6. An environmentally friendly and easy-to-clean curtain wall aluminum veneer obtained by processing according to the processing technology of an environmentally friendly and easy-to-clean curtain wall aluminum veneer according to any one of claims 1 to 5.

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