Long-acting waterproof multifunctional coating as well as preparation method and application thereof

Abstract

The invention discloses a long-acting waterproof multifunctional coating as well as a preparation method and application thereof, and the long-acting waterproof multifunctional coating comprises the following components in parts by weight: 100-120 parts of hyperbranched epoxy resin, 3-5 parts of single-ended epoxy polydimethylsiloxane, 20-30 parts of filler, 10-15 parts of tetra-needle zinc oxide whiskers, 10-15 parts of silicon carbide whiskers, 150-300 parts of a curing agent and 25-30 parts of a catalyst. 30 to 50 parts of a solvent; wherein the filler is zeolite powder, and the zeolite powder is prepared by firstly loading nano-silver and then loading polypropylene wax and aminated cellulose nanocrystals. The long-acting waterproof multifunctional coating disclosed by the invention has relatively excellent weather resistance, and shows relatively long service life when being applied to a roof photovoltaic system.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a long-lasting waterproof and multifunctional coating, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous development of the photovoltaic industry, the continuous growth of energy demand, and the enhancement of environmental protection awareness, rooftop solar photovoltaic has become an important part of the renewable energy field, and there has been a substantial increase in rooftop solar photovoltaic power generation.

[0003] Photovoltaic panels are generally directly installed on the roof. The service life of photovoltaic panels is about 10 years. Therefore, due to the difficulty in repairing the roof caused by the installation of photovoltaic panels, it is required that the waterproof project of the roof has high weather resistance and long life. The waterproofing of the roof is mainly achieved by coating waterproof coatings. Currently, the common waterproof coatings generally have a service life of about 5 years. After the expiration of the service life, it is necessary to repair the waterproof coatings. However, due to the installation of photovoltaic panels, it is very difficult to repair the waterproof coatings on the roof.

[0004] Therefore, how to further improve the service life of waterproof coatings remains to be further solved.

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a long-lasting waterproof and multifunctional coating, a preparation method thereof, and an application thereof. The long-lasting waterproof and multifunctional coating has excellent weather resistance and a long service life.

[0007] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A long-lasting waterproof and multifunctional coating, comprising the following components in parts by weight: 100-120 parts of hyperbranched epoxy resin, 3-5 parts of mono-terminal epoxy poly(dimethylsiloxane), 20-30 parts of filler, 10-15 parts of tetrapod zinc oxide whiskers, 10-15 parts of silicon carbide whiskers, 150-300 parts of curing agent, 25-30 parts of catalyst, and 30-50 parts of solvent;

[0009] Wherein, the filler is zeolite powder, and the zeolite powder is prepared by first loading nano-silver, then loading polypropylene wax and amino-functionalized cellulose nanocrystals.

[0010] In one or more embodiments of the present invention, the preparation of the zeolite powder is as follows:

[0011] Mix polypropylene wax and amino-functionalized cellulose nanocrystals in a mass ratio of 1:(0.5 - 1), heat to melt, and stir evenly.

[0012] Mix zeolite powder loaded with silver nanoparticles with the molten liquid in a mass ratio of 1:(2 - 3), stir, filter, and cool to obtain zeolite powder.

[0013] In one or more embodiments of the present invention, the zeolite powder loaded with silver nanoparticles is prepared as follows:

[0014] Mix zeolite powder and PVP powder in a mass ratio of (0.2 - 0.5):1 and an appropriate amount of water to form a dispersion. Mix silver ammonia solution and the dispersion in a ratio of the molar amount of silver ammonia ions to the mass of PVP powder of (0.005mol - 0.015mol):1g. Under a nitrogen atmosphere, heat to 70°C - 80°C and stir for 6 - 8h, then centrifuge, wash, and dry to obtain zeolite powder loaded with silver nanoparticles.

[0015] In one or more embodiments of the present invention, the preparation of the amino-functionalized cellulose nanocrystals is as follows: Mix cellulose nanocrystals, absolute ethanol, and KH550, heat to 65°C - 75°C and stir for 3 - 5h, then centrifuge, wash, and dry to obtain amino-functionalized cellulose nanocrystals.

[0016] In one or more embodiments of the present invention, the length of the cellulose nanocrystals is 150 - 250nm, and the mesh number of the zeolite powder is 200 - 300 mesh.

[0017] In one or more embodiments of the present invention, the length of the silicon carbide whiskers is 5 - 30μm, and the length of the tetrapod zinc oxide whiskers is 10 - 50μm.

[0018] In one or more embodiments of the present invention, the tetrapod zinc oxide whiskers are grafted with low molecular weight linear polyethyleneimine, and the silicon carbide whiskers are grafted with medium molecular weight linear polyethyleneimine; the molecular weight of the low molecular weight linear polyethyleneimine is 600 - 1000, and the molecular weight of the medium molecular weight linear polyethyleneimine is 1800 - 2500.

[0019] In one or more embodiments of the present invention, the preparation of the tetrapod zinc oxide whiskers grafted with low molecular weight linear polyethyleneimine is as follows: Mix tetrapod zinc oxide whiskers with an ethanol aqueous solution of a silane coupling agent, heat and react for a certain time, filter and dry to obtain pretreated tetrapod zinc oxide whiskers; mix the pretreated tetrapod zinc oxide whiskers with an alcohol solution of low molecular weight linear polyethyleneimine, let stand for a certain time, filter and dry to obtain tetrapod zinc oxide whiskers grafted with low molecular weight linear polyethyleneimine.

[0020] And / or, the preparation of the silicon carbide whiskers grafted with medium molecular weight polyethyleneimine is as follows: Mix the silicon carbide whiskers with an ethanol aqueous solution of a silane coupling agent, heat and react for a certain period of time, filter and dry to obtain pretreated silicon carbide whiskers; Mix the pretreated silicon carbide whiskers with an alcohol solution of medium molecular weight linear polyethyleneimine, let stand for a certain period of time, filter and dry to obtain silicon carbide whiskers grafted with medium molecular weight linear polyethyleneimine.

[0021] The technical solution provided by another specific embodiment of the present invention is as follows:

[0022] A preparation method of a long-acting waterproof and multifunctional coating, accurately weigh each raw material according to the ratio, and mix to obtain the long-acting waterproof and multifunctional coating.

[0023] The technical solution provided by another specific embodiment of the present invention is as follows:

[0024] An application of a long-acting waterproof and multifunctional coating in a rooftop photovoltaic system.

[0025] Compared with the prior art, the long-acting waterproof and multifunctional coating in the present invention has excellent weather resistance, can provide long-term waterproofing, and its service life can reach 10 years. Specific Embodiments

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the scope of protection of the present invention.

[0027] A specific embodiment of the present invention provides a long-acting waterproof and multifunctional coating, which includes the following components in parts by weight: 100-120 parts of hyperbranched epoxy resin, 3-5 parts of mono-terminal epoxy poly(dimethylsiloxane), 20-30 parts of filler, 10-15 parts of tetrapod zinc oxide whiskers, 10-15 parts of silicon carbide whiskers, 150-300 parts of curing agent, 25-30 parts of catalyst, and 30-50 parts of solvent; wherein, the filler is zeolite powder, and the zeolite powder is prepared by first loading nano-silver, and then loading polypropylene wax and amino-functionalized cellulose nanocrystals.

[0028] Specifically, the hyperbranched epoxy resin can endow the coating with strength, flexibility, chemical corrosion resistance and impact resistance, and can overcome the defect that the coating loses its waterproof performance due to the deformation of the substrate during long-term use. Mono-terminal epoxy poly(dimethylsiloxane) has a low surface energy and excellent hydrophobicity, and can form an interpenetrating network structure with the hyperbranched epoxy resin in the coating, which can improve the durability of the coating and extend the service life of the coating.

[0029] The four-needle zinc oxide whiskers have a three-dimensional four-needle structure and can form a reinforcing network in the coating. The silicon carbide whiskers can overlap with the four-needle zinc oxide whiskers to improve the microstructure of the coating, enhance the compactness and adhesion of the coating, enable the coating to stably exist on the surface of the substrate, and continuously exhibit waterproof performance.

[0030] The zeolite powder used in the present invention, firstly, can improve the weather resistance of the coating, slow down aging, and extend the service life. Secondly, nano silver is loaded on the zeolite powder. Silver has a high reflectivity in the visible light to near-infrared region and can efficiently reflect sunlight. Therefore, when the coating is applied to a rooftop photovoltaic system, the coating can reflect sunlight onto the photovoltaic panel, thereby improving the photoelectric conversion efficiency. Additionally, the zeolite powder is treated with polypropylene wax, enabling the polypropylene wax to fill the pores of the zeolite powder and coat the surface of the zeolite powder, thus encapsulating the nano silver loaded on the zeolite powder, reducing the possibility of the nano silver falling off the zeolite powder. Moreover, the polypropylene wax can also isolate the effects of water and oxygen on the nano silver and reduce its oxidation. The transparent property of the polypropylene wax does not affect the sunlight reflection of the nano silver, enabling the nano silver to normally exhibit its light reflection performance. At the same time, the polypropylene wax can load the amino-functionalized cellulose nanocrystals on the zeolite powder. The cellulose nanocrystals can, to a certain extent, improve the water resistance of the coating, and the amino groups contained therein can also react with the curing agent to participate in the formation of the crosslinked network in the coating, thereby enhancing the compactness of the coating. Meanwhile, it can improve the stability of the zeolite powder in the coating, increase the durability of the coating, and extend the service life.

[0031] Furthermore, the preparation of the filler zeolite powder is as follows:

[0032] Mix the cellulose nanocrystals, absolute ethanol, and KH550, heat to 65°C - 75°C, stir for 3 - 5 hours, centrifuge, wash, and dry to obtain amino-functionalized cellulose nanocrystals;

[0033] Mix the zeolite powder and PVP powder in a mass ratio of (0.2 - 0.5):1 and an appropriate amount of water to form a dispersion. Mix the silver ammonia solution and the dispersion in a ratio of the molar amount of silver ammonia ions to the mass of PVP powder of (0.005 mol - 0.015 mol):1 g. Under a nitrogen atmosphere, heat to 70°C - 80°C and stir for 6 - 8 hours, then centrifuge, wash, and dry to obtain zeolite powder loaded with nano silver;

[0034] Mix the polypropylene wax and the amino-functionalized cellulose nanocrystals in a mass ratio of 1:(0.5 - 1), heat to melt, and stir evenly;

[0035] Mix the zeolite powder loaded with nano silver and the molten liquid in a mass ratio of 1:(2 - 3), stir, filter, and cool to obtain the product.

[0036] Further, the length of the cellulose nanocrystals is 150 - 250 nm, and the mesh number of the zeolite powder is 200 - 300 mesh. By controlling the specifications of the cellulose nanocrystals and the zeolite powder, it helps the cellulose nanocrystals to be better loaded on the zeolite powder and can effectively improve the durability of the coating.

[0037] Further, the length of the silicon carbide whiskers is 5 - 30 μm, and the length of the tetrapod zinc oxide whiskers is 10 - 50 μm. By controlling the specifications of the silicon carbide whiskers and the tetrapod zinc oxide whiskers, the two can effectively cooperate to form a network structure in the coating system, improving the denseness and weather resistance of the coating.

[0038] Further, the tetrapod zinc oxide whiskers are grafted with low molecular weight linear polyethyleneimine, and the silicon carbide whiskers are grafted with medium molecular weight linear polyethyleneimine; the molecular weight of the low molecular weight linear polyethyleneimine is 600 - 1000, and the molecular weight of the medium molecular weight linear polyethyleneimine is 1800 - 2500.

[0039] Specifically, the amino groups contained in the polyethyleneimine can react with the curing agent, thereby improving the adhesion and durability of the coating to the substrate. The tetrapod zinc oxide whiskers have a three-dimensional four-needle-like stereostructure, and the silicon carbide whiskers are in the shape of single crystal fibers. Compared with the medium molecular weight linear polyethyleneimine, the low molecular weight linear polyethyleneimine has a shorter molecular chain, more advantageous reaction activity, and smaller steric hindrance. Using the low molecular weight linear polyethyleneimine to treat the tetrapod zinc oxide whiskers, with the help of the stereostructure of the tetrapod zinc oxide whiskers, the silicon carbide whiskers can effectively overlap with the tetrapod zinc oxide whiskers. The stereostructure of the tetrapod zinc oxide whiskers enables more low molecular weight linear polyethyleneimine to be loaded on its surface. Thus, during the curing process, the tetrapod zinc oxide whiskers can further improve the denseness of the coating with the help of the low molecular weight linear polyethyleneimine, while the medium molecular weight linear polyethyleneimine on the single crystal fibers interpenetrates into the network structure formed by the low molecular weight linear polyethyleneimine. Therefore, with the help of the network formed by the stereostructure between the tetrapod zinc oxide whiskers and the silicon carbide whiskers and the network formed by the chemical reaction between the low molecular weight linear polyethyleneimine and the medium molecular weight linear polyethyleneimine, the cured coating has high denseness, waterproofness and weather resistance, and the service life is greatly extended.

[0040] Further, the curing agent is hexamethylene diisocyanate, the catalyst is organic bismuth or dibutyltin dilaurate, and the solvent is ethyl acetate.

[0041] Another specific embodiment of the present invention provides a preparation method of a long-lasting waterproof and multifunctional coating. According to the ratio, accurately weigh each raw material and mix them to obtain the long-lasting waterproof and multifunctional coating.

[0042] Another specific embodiment of the present invention provides an application of the long-lasting waterproof and multifunctional coating in a rooftop photovoltaic system.

[0043] The present invention will be further described in detail below in conjunction with specific embodiments.

[0044] The raw materials used in the present invention, hyperbranched epoxy resin is purchased from Wuhan Hyperbranched Resin, model HyPer E102; mono-terminal epoxy group polydimethylsiloxane is purchased from Wuhan Lanabai, model lnb-1723; cellulose nanocrystals are purchased from Macklin; silicon carbide whiskers are purchased from Qinghe County Chaotai Metal Materials, model D500B; zinc oxide whiskers are purchased from Wuhan Kemike; polypropylene wax is purchased from Jining Fangyu Chemical Industry, melting point 160 °C; polyethyleneimine is purchased from Macklin; zeolite powder is purchased from Hebei Jiyan Mineral Products.

[0045] Preparation Example 1

[0046] Mix absolute ethanol and KH550 to prepare a treatment solution with a volume concentration of 5%. Based on adding 6 mg of cellulose nanocrystals to 100 ml of the treatment solution, mix the treatment solution and cellulose nanocrystals, heat to 70 °C, continuously stir for 3 h for reaction, then centrifuge, wash the cellulose nanocrystals with absolute ethanol, and dry at 65 °C for 3 h to obtain amino-functionalized cellulose nanocrystals.

[0047] Take zeolite powder and PVP powder (polyvinylpyrrolidone), the mass ratio of zeolite powder to PVP powder is 0.5:1. Based on using 40 ml of deionized water for 1 g of PVP powder, mix zeolite powder, PVP powder and deionized water, and stir to obtain a dispersion. Take silver nitrate powder. Based on using 15 ml of deionized water for 0.005 mol of silver nitrate, mix silver nitrate powder and deionized water powder, then dropwise add ammonia water until the formed grey precipitate just disappears to obtain a silver ammonia solution. Based on 1 g of PVP powder requiring 0.005 mol of silver ammonia ions, mix the dispersion and the silver ammonia solution, first remove air for 1 h under a nitrogen atmosphere, then heat to 75 °C, stir at 250 r / min for 6 h, then centrifuge and wash with water, and vacuum dry at 55 °C for 20 h to obtain zeolite powder loaded with silver nanoparticles.

[0048] Take polypropylene wax and amino-functionalized cellulose nanocrystals, mix them according to the mass ratio of polypropylene wax to amino-functionalized cellulose nanocrystals of 1:0.5, heat to 165 °C, stir at 200 r / min for 20 min to obtain a molten liquid. Mix the zeolite powder loaded with silver nanoparticles and the molten liquid according to the mass ratio of 1:2, stir at 200 r / min for 20 min, filter, and cool to room temperature to obtain zeolite powder.

[0049] Preparation Example 2

[0050] The difference between this preparation example and Preparation Example 1 is only that the mass ratio of polypropylene wax to amino-functionalized cellulose nanocrystals is 1:1, and the mass ratio of the zeolite powder loaded with silver nanoparticles to the molten liquid is 1:3.

[0051] Preparation Example 3

[0052] Mix the silane coupling agent KH550, absolute ethanol, and water in a volume ratio of 20:72:8 to prepare the first treatment solution. Based on 100 ml of ethanol mixed with 30 g of polyethyleneimine with a molecular weight of 600, mix ethanol and polyethyleneimine to prepare the second treatment solution.

[0053] Based on 100 ml of the first treatment solution added with 5 mg of tetrapod zinc oxide whiskers, mix the first treatment solution and tetrapod zinc oxide whiskers, heat to 65 °C and react for 3 h, take out the tetrapod zinc oxide whiskers, and dry at 60 °C for 2 h. Then, based on 100 ml of the second treatment solution added with 5 mg of tetrapod zinc oxide whiskers, add the tetrapod zinc oxide whiskers to the second treatment solution and soak for 30 min. Take out the tetrapod zinc oxide whiskers and dry at 50 °C for 30 min to obtain tetrapod zinc oxide whiskers grafted with low-molecular-weight linear polyethyleneimine.

[0054] Preparation Example 4

[0055] Mix the silane coupling agent KH550, absolute ethanol, and water in a volume ratio of 20:72:8 to prepare the first treatment solution. Based on 100 ml of ethanol mixed with 30 g of polyethyleneimine with a molecular weight of 1800, mix ethanol and polyethyleneimine to prepare the second treatment solution.

[0056] Based on 100 ml of the first treatment solution added with 5 mg of silicon carbide whiskers, mix the first treatment solution and silicon carbide whiskers, heat to 65 °C and react for 3 h, take out the silicon carbide whiskers, and dry at 60 °C for 2 h. Then, based on 100 ml of the second treatment solution added with 5 mg of silicon carbide whiskers, add the silicon carbide whiskers to the second treatment solution and soak for 30 min. Take out the silicon carbide whiskers and dry at 50 °C for 30 min to obtain silicon carbide whiskers grafted with medium-molecular-weight linear polyethyleneimine.

[0057] Preparation Example 5

[0058] Mix the silane coupling agent KH550, absolute ethanol, and water in a volume ratio of 20:72:8 to prepare the first treatment solution. Based on 100 ml of ethanol mixed with 30 g of polyethyleneimine with a molecular weight of 600, mix ethanol and polyethyleneimine to prepare the second treatment solution.

[0059] Based on 100 ml of the first treatment solution added with 5 mg of silicon carbide whiskers, mix the first treatment solution and tetrapod zinc oxide whiskers, heat to 65 °C and react for 3 h, take out the silicon carbide whiskers, and dry at 60 °C for 2 h. Then, based on 100 ml of the second treatment solution added with 5 mg of silicon carbide whiskers, add the silicon carbide whiskers to the second treatment solution and soak for 30 min. Take out the silicon carbide whiskers and dry at 50 °C for 30 min to obtain silicon carbide whiskers grafted with low-molecular-weight linear polyethyleneimine.

[0060] Preparation Example 6

[0061] Mix silane coupling agent KH550, absolute ethanol and water according to a volume ratio of 20:72:8 to prepare the first treatment liquid. Based on 100 ml of ethanol mixed with 30 g of polyethyleneimine with a molecular weight of 1800, mix ethanol and polyethyleneimine to prepare the second treatment liquid.

[0062] Based on adding 5 mg of tetrapod zinc oxide whiskers to 100 ml of the first treatment liquid, mix the first treatment liquid and tetrapod zinc oxide whiskers, heat to 65 °C and react for 3 h, take out the tetrapod zinc oxide whiskers, and dry at 60 °C for 2 h. Then, based on adding 5 mg of tetrapod zinc oxide whiskers to 100 ml of the second treatment liquid, add the tetrapod zinc oxide whiskers to the second treatment liquid and soak for 30 min. Take out the tetrapod zinc oxide whiskers and dry at 50 °C for 30 min to obtain tetrapod zinc oxide whiskers grafted with medium molecular weight linear polyethyleneimine.

[0063] Example 1

[0064] A long-lasting waterproof and multifunctional coating, by weight, includes 100 parts of hyperbranched epoxy resin, 4 parts of mono-terminal epoxy poly(dimethylsiloxane), 20 parts of zeolite powder in Preparation Example 1, 12 parts of tetrapod zinc oxide whiskers, 10 parts of silicon carbide whiskers, 150 parts of hexamethylene diisocyanate, 25 parts of dibutyltin dilaurate, and 30 parts of ethyl acetate. Mix the above raw materials evenly to obtain the long-lasting waterproof and multifunctional coating.

[0065] Example 2

[0066] A long-lasting waterproof and multifunctional coating, by weight, includes 120 parts of hyperbranched epoxy resin, 5 parts of mono-terminal epoxy poly(dimethylsiloxane), 25 parts of zeolite powder in Preparation Example 1, 10 parts of tetrapod zinc oxide whiskers, 13 parts of silicon carbide whiskers, 300 parts of hexamethylene diisocyanate, 28 parts of dibutyltin dilaurate, and 50 parts of ethyl acetate. Mix the above raw materials evenly to obtain the long-lasting waterproof and multifunctional coating.

[0067] Example 3

[0068] A long-lasting waterproof and multifunctional coating, by weight, includes 110 parts of hyperbranched epoxy resin, 3 parts of mono-terminal epoxy poly(dimethylsiloxane), 30 parts of zeolite powder in Preparation Example 1, 15 parts of tetrapod zinc oxide whiskers, 15 parts of silicon carbide whiskers, 200 parts of hexamethylene diisocyanate, 30 parts of dibutyltin dilaurate, and 40 parts of ethyl acetate. Mix the above raw materials evenly to obtain the long-lasting waterproof and multifunctional coating.

[0069] Example 4

[0070] A long - acting waterproof and multifunctional coating, by weight, includes 100 parts of hyperbranched epoxy resin, 4 parts of mono - terminal epoxy - based polydimethylsiloxane, 20 parts of zeolite powder in Preparation Example 1, 12 parts of tetrapod - shaped zinc oxide whiskers in Preparation Example 3, 10 parts of silicon carbide whiskers, 150 parts of hexamethylene diisocyanate, 25 parts of dibutyltin dilaurate, and 30 parts of ethyl acetate. Mix the above raw materials to obtain the long - acting waterproof and multifunctional coating.

[0071] Example 5

[0072] A long - acting waterproof and multifunctional coating, by weight, includes 100 parts of hyperbranched epoxy resin, 4 parts of mono - terminal epoxy - based polydimethylsiloxane, 20 parts of zeolite powder in Preparation Example 1, 12 parts of tetrapod - shaped zinc oxide whiskers, 10 parts of silicon carbide whiskers in Preparation Example 4, 150 parts of hexamethylene diisocyanate, 25 parts of dibutyltin dilaurate, and 30 parts of ethyl acetate. Mix the above raw materials to obtain the long - acting waterproof and multifunctional coating.

[0073] Example 6

[0074] A long - acting waterproof and multifunctional coating, by weight, includes 100 parts of hyperbranched epoxy resin, 4 parts of mono - terminal epoxy - based polydimethylsiloxane, 20 parts of zeolite powder in Preparation Example 1, 12 parts of tetrapod - shaped zinc oxide whiskers in Preparation Example 3, 10 parts of silicon carbide whiskers in Preparation Example 4, 150 parts of hexamethylene diisocyanate, 25 parts of dibutyltin dilaurate, and 30 parts of ethyl acetate. Mix the above raw materials to obtain the long - acting waterproof and multifunctional coating.

[0075] Example 7

[0076] A long - acting waterproof and multifunctional coating, by weight, includes 100 parts of hyperbranched epoxy resin, 4 parts of mono - terminal epoxy - based polydimethylsiloxane, 20 parts of zeolite powder in Preparation Example 1, 12 parts of tetrapod - shaped zinc oxide whiskers in Preparation Example 6, 10 parts of silicon carbide whiskers in Preparation Example 5, 150 parts of hexamethylene diisocyanate, 25 parts of dibutyltin dilaurate, and 30 parts of ethyl acetate. Mix the above raw materials to obtain the long - acting waterproof and multifunctional coating.

[0077] Comparative Example 1

[0078] A long - acting waterproof and multifunctional coating, by weight, includes 100 parts of hyperbranched epoxy resin, 4 parts of mono - terminal epoxy - based polydimethylsiloxane, 20 parts of zeolite powder, 12 parts of tetrapod - shaped zinc oxide whiskers, 10 parts of silicon carbide whiskers, 150 parts of hexamethylene diisocyanate, 25 parts of dibutyltin dilaurate, and 30 parts of ethyl acetate. Mix the above raw materials to obtain the long - acting waterproof and multifunctional coating.

[0079] Performance test:

[0080] Coat the glass test panel with the coating, with a coating thickness of 5 μm, and cure it at 140 °C for 2 h to prepare a sample.

[0081] Refer to GB / T 9286-2021 "Cross-Cut Test for Paints and Varnishes" to test the adhesion of the sample coating. Then place the sample in a PCT aging chamber (121 °C, 100% relative humidity, 211.6 kPa) for 48 h of aging treatment, and test the adhesion of the sample coating again, and record the appearance of the coating.

[0082] Table 1 Performance Test Results

[0083]

[0084]

[0085] As can be seen from Table 1, compared with Comparative Example 1, the coating in the embodiment of the present invention has better weather resistance, excellent adhesion, and a longer service life.

[0086] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0087] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A long-acting waterproof multi-functional coating, characterized in that, It comprises the following components in parts by weight: 100 - 120 parts of hyperbranched epoxy resin, 3 - 5 parts of mono - terminal epoxy - based polydimethylsiloxane, 20 - 30 parts of filler, 10 - 15 parts of tetrapod - shaped zinc oxide whiskers, 10 - 15 parts of silicon carbide whiskers, 150 - 300 parts of curing agent, 25 - 30 parts of catalyst, and 30 - 50 parts of solvent; Among them, the filler is zeolite powder, and the zeolite powder is prepared by first loading nano - silver, and then loading polypropylene wax and amino - functionalized cellulose nanocrystals.

2. The long-acting waterproof multi-functional coating according to claim 1, characterized in that, The preparation of the zeolite powder is as follows: Mix polypropylene wax and amino - functionalized cellulose nanocrystals according to a mass ratio of 1:(0.5 - 1), heat to melt, and stir and mix evenly; Mix the zeolite powder loaded with nano - silver with the molten liquid according to a mass ratio of 1:(2 - 3), stir, filter, and cool to obtain zeolite powder.

3. The long-acting waterproof multi-functional coating according to claim 2, wherein, The preparation of the zeolite powder loaded with nano - silver is as follows: Mix zeolite powder and PVP powder in a mass ratio of (0.2 - 0.5):1 and an appropriate amount of water to form a dispersion liquid. Mix the silver ammonia solution and the dispersion liquid with a ratio of the molar amount of silver ammonia ions to the mass of PVP powder of (0.005mol - 0.015mol):1g. Under a nitrogen atmosphere, heat to 70℃ - 80℃ and stir for 6 - 8h, then centrifuge, wash, and dry to obtain the zeolite powder loaded with nano - silver.

4. The long-acting waterproof multi-functional coating according to claim 2, characterized in that, The preparation of the amino - functionalized cellulose nanocrystals is as follows: Mix cellulose nanocrystals, absolute ethanol, and KH550, heat to 65℃ - 75℃ and stir for 3 - 5h, centrifuge, wash, and dry to obtain amino - functionalized cellulose nanocrystals.

5. The long-acting waterproof multi-functional coating according to claim 2, characterized in that, The length of the cellulose nanocrystals is 150 - 250nm, and the mesh number of the zeolite powder is 200 - 300 mesh.

6. The long-acting waterproof multi-functional coating according to claim 1, wherein The length of the silicon carbide whiskers is 5 - 30μm, and the length of the tetrapod - shaped zinc oxide whiskers is 10 - 50μm.

7. The long-acting waterproof multi-functional coating according to claim 1, characterized in that, The tetrapod - shaped zinc oxide whiskers are grafted with low - molecular - weight linear polyethyleneimine, and the silicon carbide whiskers are grafted with medium - molecular - weight linear polyethyleneimine; the molecular weight of the low - molecular - weight linear polyethyleneimine is 600 - 1000, and the molecular weight of the medium - molecular - weight linear polyethyleneimine is 1800 - 2500.

8. The long-acting waterproof multi-functional coating according to claim 7, characterized in that, The preparation of the tetrapod - shaped zinc oxide whiskers grafted with low - molecular - weight linear polyethyleneimine is as follows: Mix the tetrapod - shaped zinc oxide whiskers with an ethanol aqueous solution of a silane coupling agent, heat and react for a certain time, filter and dry to obtain pretreated tetrapod - shaped zinc oxide whiskers; mix the pretreated tetrapod - shaped zinc oxide whiskers with an alcohol solution of low - molecular - weight linear polyethyleneimine, let stand for a certain time, filter and dry to obtain the tetrapod - shaped zinc oxide whiskers grafted with low - molecular - weight linear polyethyleneimine; And / or, the preparation of the silicon carbide whiskers grafted with medium - molecular - weight polyethyleneimine is as follows: Mix the silicon carbide whiskers with an ethanol aqueous solution of a silane coupling agent, heat and react for a certain time, filter and dry to obtain pretreated silicon carbide whiskers; mix the pretreated silicon carbide whiskers with an alcohol solution of medium - molecular - weight linear polyethyleneimine, let stand for a certain time, filter and dry to obtain the silicon carbide whiskers grafted with medium - molecular - weight linear polyethyleneimine.

9. A method for preparing the long-acting waterproof multi-functional coating according to any one of claims 1-8, characterized in that, Weigh each raw material accurately according to the ratio, mix them to obtain a long - acting waterproof multi - functional coating.

10. Application of the long-acting waterproof multi-functional coating according to any one of claims 1-8 in a rooftop photovoltaic system.

Images