Environmentally friendly self-cleaning photovoltaic glass coating and method for its preparation

Abstract

The present application relates to a kind of environmentally friendly self-cleaning photovoltaic glass coating and its preparation method, the environmentally friendly self-cleaning photovoltaic glass coating includes the following mass parts of ingredients: organic resin 30-60 parts, hydrophilic modifier 5-10 parts, modified filler 10-15 parts, chitosan 1-10 parts, titanium dioxide 1-10 parts, auxiliary agent 1-10 parts, solvent 50-100 parts;Wherein, the hydrophilic modifier is silane copolymer;The modified filler is polyether polyol modified silicon dioxide.The present application uses hydrophilic organic resin, silane copolymer hydrophilic modifier compound, simultaneously uses polyether polyol modified silicon dioxide as filler, good synergistic effect is generated between multiple components, while greatly improving the hydrophilic performance of coating, effectively improve the compatibility between components, crosslinking density, so that product has stronger stability and self-cleaning effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to an environmentally friendly self-cleaning photovoltaic glass coating and a preparation method thereof. BACKGROUND

[0002] With the continuous development of science and technology and industry, the world energy structure is transforming towards diversification, ecology and low carbonization, and the photovoltaic industry is an important part of the new energy industry.

[0003] In a photovoltaic power generation system, photovoltaic panels are exposed to the outdoor environment for a long time, and dust and pollutants in the air are easily deposited on the surface of the panel, causing shading, corrosion and other phenomena, affecting the light transmittance and stability of the photovoltaic panel, damaging the panel and reducing the power generation efficiency, resulting in a significant increase in operating costs.

[0004] To ensure the long-term stable operation of the photovoltaic panel, a coating is usually applied to the surface of the panel, however, the existing coating has the problems of short service life, low adhesion, low light transmittance, negative power generation gain, poor self-cleaning ability, and large environmental pollution caused by organic diluents. The existing hydrophobic self-cleaning coating has certain protective and cleaning effect on pollutants, but it still has the defects of complex production process and high cost, so it is difficult to meet the needs of actual application and cannot be widely applied.

[0005] In view of the above, it is necessary to develop a new technical scheme to solve the problems in the prior art. SUMMARY

[0006] Based on this, the present application provides an environmentally friendly self-cleaning photovoltaic glass coating and a preparation method thereof. The present application uses a hydrophilic organic resin, a silane copolymer hydrophilic modifier, and chitosan, and simultaneously uses polyether polyol modified silica as a filler, which produces a good synergistic effect between the various components, greatly improves the hydrophilic properties of the coating, and effectively improves the compatibility and crosslinking density between the components, so that the product has stronger stability and self-cleaning effect.

[0007] One object of the present application is to provide an environmentally friendly self-cleaning photovoltaic glass coating, which comprises the following components in mass fraction:

[0008]

[0009] Among them,

[0010] The hydrophilic modifier is a silane copolymer;

[0011] The modified filler is polyether polyol modified silica.

[0012] Further, the monomer raw material of the silane copolymer is selected from one or more of methyl silicate, ethyl silicate, propyl silicate and butyl silicate.

[0013] Further, the organic resin is selected from one or more of a hydrophilic amino acrylate resin and a FEVE fluorocarbon resin.

[0014] Further, the auxiliary agent is selected from one or more of a leveling agent, a defoaming agent, an ultraviolet absorber, a dispersing agent, an antioxidant, a photoinitiator, a curing agent and an antistatic agent.

[0015] Further, the chitosan is hydroxypropyl chitosan.

[0016] The chitosan in the application is a bio-based material, which has the characteristics of green, natural and environmental friendliness. The component also has the advantages of good hydrophilicity and strong stability, and has a promoting effect on the absorption of water by the coating and the formation of a water film.

[0017] The titanium dioxide in the application has good hydrophilicity and stability, and strong photocatalytic activity, and can decompose and remove pollutants attached to the surface of the coating through sunlight and ultraviolet light irradiation, thereby achieving the technical effect of self-cleaning.

[0018] Another object of the application is to provide a preparation method of the above-mentioned environmentally friendly self-cleaning photovoltaic glass coating, which comprises the following steps:

[0019] S1, blending silica and epoxy silane coupling agent, heating and stirring to react to obtain an intermediate product, then blending the intermediate product, polyether polyol and catalyst, and heating to react under an inert gas atmosphere to obtain a modified filler;

[0020] S2, adding silane into a solvent, then adding catalyst and water, and stirring and heating to react, and then purifying to obtain a hydrophilic modifier;

[0021] S3, blending and stirring the modified filler, the hydrophilic modifier and other components uniformly to obtain a product.

[0022] Further, in step S1, the heating and stirring reaction is carried out at a temperature of 30-80℃ for 3-6h.

[0023] Further, in step S1, the heating reaction is carried out at a temperature of 80-100℃ for 24-72h.

[0024] Further, in step S1, the catalyst is an alkali catalyst.

[0025] Further, in step S2, the stirring and heating reaction is carried out at a temperature of 50-70℃ for 2-5h.

[0026] Further, in step S2, the catalyst is an acid catalyst.

[0027] Further, the polyether polyol is polyether 330.

[0028] The present application has the following beneficial effects:

[0029] The environment-friendly self-cleaning photovoltaic glass coating provided by the present application does not contain organic diluents such as acetone, thereby avoiding pollution to the environment, and the specific hydrophilic organic resin is used as the base resin, and the hydrophilicity is good. The present application also modifies the silica filler. First, the epoxy silane coupling agent is used to treat the intermediate product, and the epoxy group is introduced on the surface of the silica. Then, the intermediate product and the polyether polyol are reacted under the catalysis of alkali, so that the branched structure of the alkoxy chain segment and a large number of hydroxyl groups are grafted on the surface of the silica, which not only further improves the hydrophilicity of the silica, but also enhances the dispersibility and stability of the modified filler. Moreover, the small molecule silane is subjected to a polycondensation reaction to obtain a hydrophilic modifier, thereby increasing the density and content of the silane group, improving the hydrophilic function, promoting the coating to absorb water to form a water film, and enhancing the anti-staining and self-cleaning effects.

[0030] In addition, the modified filler and the hydrophilic modifier in the present application contain a large number of hydroxyl groups, ether bonds and branched chain segments, and have good compatibility with the organic resin, hydroxypropyl chitosan and other components, and the active groups can be chemically crosslinked, and intermolecular forces can also be generated, thereby forming a more three-dimensional network structure, which further improves the stability and weather resistance of the coating, and the coating can be used for a long time under various conditions, and has good application prospects. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions of the present application, the following examples are listed. The raw materials, reactions and post-treatment methods in the examples are all common raw materials on the market and technical means well known to those skilled in the art, unless otherwise stated.

[0032] The words "preferred", "preferably", "more preferred", etc. in the present application refer to the embodiments of the present application which can provide certain beneficial effects in certain cases. However, other embodiments can also be preferred in the same or other cases. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the present application.

[0033] It should be understood, that, except in any operating example, or otherwise indicated herein, such as amounts or all numbers expressing quantities of ingredients, reaction times and the like used herein and in the following examples express, unless otherwise indicated, amounts in all cases to be used in the preparation of the compositions and methods of the present application are to be understood as modified by the term ''about''. It is also understood that the word "comprising" is used herein to mean "including but not limited to" and, therefore, should not be interpreted as being restricted or limited in some way. Thus, for example, a composition or method that "comprises" a list of elements can consist of those elements, or can further comprise other elements.

[0034] The organic resin in the embodiment of the present application is methyl etherified amino acrylic resin, and the brand is Jiangsu Sanmu 6121.

[0035] The auxiliary in the embodiment of the present application is a mass ratio of 1:1 of the photoinitiator Irgacure 2959 and the curing agent M HG-80B.

[0036] The chitosan in the embodiment of the present application is hydroxypropyl chitosan, which is purchased from Jingmen Dongxin Biological Technology Co., Ltd.

[0037] The titanium dioxide in the embodiment of the present application is nano titanium dioxide, which is purchased from Hangzhou Hengna New Material Co., Ltd.

[0038] The particle size of the silicon dioxide in the embodiment of the present application is 10-20 nm.

[0039] The solvent in the embodiment of the present application is butyl acetate.

[0040] The concentration of hydrochloric acid in the embodiment of the present application is 15wt%.

[0041] The "parts" in the embodiment of the present application all refer to mass parts.

[0042] Example 1

[0043] An environmentally friendly self-cleaning photovoltaic glass coating, comprising the following components in mass parts:

[0044]

[0045] The preparation method of the above-mentioned environmentally friendly self-cleaning photovoltaic glass coating comprises the following steps:

[0046] S1, with ethanol as a solvent, the mass ratio of 1:0.5 of silicon dioxide and KH560 is blended, 60℃ stirring reaction 3h, after filtration, washing with solvent, drying to obtain intermediate product;

[0047] Under the atmosphere of nitrogen, 1, 4-dioxane is used as a solvent, the mass ratio of 1:1 of the intermediate product and polyether 330 is blended, then triethylamine (1wt% of the reaction system) is added, 90℃ stirring reaction 72h, after filtration, washing with solvent, drying to obtain modified filler;

[0048] S2, adding ethyl silicate as solvent, then stirring to add deionized water (ethyl silicate: deionized water = 1:1, n / n), adjusting pH to 4 with hydrochloric acid, stirring at 60°C for 4h, removing the solvent by distillation under reduced pressure, and obtaining a hydrophilic modifier;

[0049] S3, blending the modified filler, the hydrophilic modifier and other ingredients according to the above mass fractions, and stirring uniformly to obtain a product.

[0050] Example 2

[0051] An environmentally friendly self-cleaning photovoltaic glass coating includes the following ingredients in mass fractions:

[0052]

[0053] The preparation method of the above-mentioned environmentally friendly self-cleaning photovoltaic glass coating includes the following steps:

[0054] S1, blending silica and KH560 in a mass ratio of 1:0.5 with ethanol as solvent, stirring at 60°C for 3h, washing with solvent after filtration, drying to obtain an intermediate product;

[0055] Blending the intermediate product and polyether 330 in a mass ratio of 1:1 with 1,4-dioxane as solvent under nitrogen atmosphere, then adding triethylamine (1wt% of the reaction system), stirring at 90°C for 72h, washing with solvent after filtration, and drying to obtain a modified filler;

[0056] S2, adding ethyl silicate as solvent, then stirring to add deionized water (ethyl silicate: deionized water = 1:1, n / n), adjusting pH to 4 with hydrochloric acid, stirring at 60°C for 4h, removing the solvent by distillation under reduced pressure, and obtaining a hydrophilic modifier;

[0057] S3, blending the modified filler, the hydrophilic modifier and other ingredients according to the above mass fractions, and stirring uniformly to obtain a product.

[0058] Example 3

[0059] An environmentally friendly self-cleaning photovoltaic glass coating includes the following ingredients in mass fractions:

[0060]

[0061] The preparation method of the above-mentioned environmentally friendly self-cleaning photovoltaic glass coating includes the following steps:

[0062] S1, blending silica and KH560 in a mass ratio of 1:0.5 with ethanol as solvent, stirring at 60°C for 3h, washing with solvent after filtration, drying to obtain an intermediate product;

[0063] The intermediate product and polyether 330 were blended in a mass ratio of 1:1 in 1,4-dioxane as a solvent, then triethylamine (1 wt% of the reaction system) was added, and the mixture was stirred at 90°C for 72h. After filtration, washing with solvent and drying, the modified filler was obtained.

[0064] S2, ethanol was added as a solvent, then ethyl silicate was added, followed by stirring and adding deionized water (ethyl silicate: deionized water = 1:1, n / n), and the pH was adjusted to 4 with hydrochloric acid. The mixture was stirred at 60°C for 4h. After removing the solvent by distillation under reduced pressure, the hydrophilic modifier was obtained.

[0065] S3, the modified filler, the hydrophilic modifier and other ingredients were blended and stirred uniformly according to the above mass fractions to obtain the product.

[0066] Comparative Example 1

[0067] A photovoltaic glass coating, the difference between this comparative example and Example 1 is that the hydrophilic modifier is replaced with an equal amount of ethyl silicate, and the other ingredients and preparation method are the same as those of Example 1.

[0068] Comparative Example 2

[0069] A photovoltaic glass coating, the difference between this comparative example and Example 1 is that the modified filler is replaced with an equal amount of unmodified silica, and the other ingredients and preparation method are the same as those of Example 1.

[0070] Test Example

[0071] The photovoltaic glass coatings prepared in Examples 1-3 and Comparative Examples 1-2 were tested for performance.

[0072] The test method is as follows:

[0073] The photovoltaic glass coatings prepared in Examples or Comparative Examples were respectively coated on the surface of photovoltaic glass, and then cured at 60°C for 5h. Then, the coatings were irradiated with 395nm, 400mJ / cm 2 of ultraviolet light to obtain a 3-5μm thick coating.

[0074] The hardness, adhesion, light transmittance, stain resistance and artificial climate resistance were tested according to GB / T 6739, GB / T 9286, GB / T 2410, GB / T 9780 and GB / T 14522 standards.

[0075] The test results are shown in Table 1.

[0076] Table 1 Performance Test Results

[0077] Item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Hardness H H H H H Adhesion 0 rank 0 rank 0 rank 0 rank 1 rank Transmittance / % 88 89 88 87 84 Stain resistance 0.8 0.8 0.9 0.6 0.7 Weather resistance / 4000h No bubble, cracking No bubble, cracking No bubble, cracking No bubble, cracking Few bubbles

[0078] According to Table 1, it can be concluded that the environment-friendly self-cleaning photovoltaic glass coating prepared by the embodiment of the present application has excellent performance, and the adhesion, light transmittance, stain resistance and weather resistance are good, while the adhesion, light transmittance, stain resistance and other performances of Comparative Example 1 in which the hydrophilic modifier is replaced and Comparative Example 2 in which the conventional silica filler is used are obviously decreased, proving that the specific components used in the present application can effectively improve the performance of the coating, and the various components can form a synergistic effect to achieve more ideal performance improvement. In summary, the present application solves the problems existing in the prior art and has good application prospect.

[0079] It will be obvious to a person skilled in the art that, as the application is not limited to the details of the exemplary embodiments described above, the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application.

[0080] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An environmentally friendly self-cleaning photovoltaic glass coating, characterized by, The environmentally friendly self-cleaning photovoltaic glass coating comprises the following components in parts by weight: 30-60 parts of organic resin 5-10 parts of hydrophilic modifier 10-15 parts of modified filler 1-10 parts chitosan 1-10 parts of titanium dioxide 1-10 parts of auxiliary agent Solvent 50-100 parts; in, The hydrophilic modifier is a silane copolymer; The modified filler is polyether polyol modified silica; The organic resin is a hydrophilic amino acrylic resin; The preparation method of the hydrophilic modifier includes the following steps: The monomer is added to the solvent, then the catalyst and water are added, and the reaction is stirred and heated. After purification, the hydrophilic modifier is obtained. The monomer raw material of the silane copolymer is selected from one or more of methyl silicate, ethyl silicate, propyl silicate, and butyl silicate; The preparation method of the modified filler includes the following steps: Silica and epoxy silane coupling agent are blended and heated and stirred to obtain an intermediate product. Then, the intermediate product, polyether polyol, and catalyst are blended and heated under an inert gas atmosphere to obtain a modified filler.

2. The environmentally friendly self-cleaning photovoltaic glass coating according to claim 1, wherein, The additives are selected from one or more of the following: leveling agents, defoamers, ultraviolet absorbers, dispersants, antioxidants, photoinitiators, curing agents, and antistatic agents.

3. The process for the production of the environmentally friendly self-cleaning photovoltaic glass coating according to any one of claims 1-2, characterized in that, The method for preparing the environmentally friendly self-cleaning photovoltaic glass coating includes the following steps: S1. Silica and epoxy silane coupling agent are mixed and heated and stirred to obtain an intermediate product. Then, the intermediate product, polyether polyol and catalyst are mixed and heated under an inert gas atmosphere to obtain a modified filler. S2. Add the monomer to the solvent, then add the catalyst and water, stir and heat to react, and then purify to obtain the hydrophilic modifier; S3. The modified filler, hydrophilic modifier and other components are mixed and stirred evenly to obtain the product.

4. A process for the preparation of an environmentally friendly self-cleaning photovoltaic glass coating according to claim 3, characterized in that, In step S1, the heating and stirring reaction is carried out at a temperature of 30-80°C for 3-6 hours.

5. A process for the preparation of an environmentally friendly self-cleaning photovoltaic glass coating according to claim 3, characterized in that, In step S1, the heating reaction is carried out at a temperature of 80-100℃ for 24-72 hours.

6. A process for the preparation of an environmentally friendly self-cleaning photovoltaic glass coating according to claim 3, characterized in that, In step S1, the catalyst is an alkaline catalyst.

7. A process for the preparation of an environmentally friendly self-cleaning photovoltaic glass coating according to claim 3, characterized in that, In step S2, the temperature of the stirring and heating reaction is 50-70℃, and the time is 2-5 h.

8. A process for the preparation of an environmentally friendly self-cleaning photovoltaic glass coating according to claim 3, characterized in that, In step S2, the catalyst is an acid catalyst.

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