CN110922872A - Glass soot-resistant coating composition, soot-resistant coating dispersion and articles comprising same - Google Patents
Glass soot-resistant coating composition, soot-resistant coating dispersion and articles comprising same Download PDFInfo
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- CN110922872A CN110922872A CN201811101230.1A CN201811101230A CN110922872A CN 110922872 A CN110922872 A CN 110922872A CN 201811101230 A CN201811101230 A CN 201811101230A CN 110922872 A CN110922872 A CN 110922872A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1687—Use of special additives
Abstract
The invention relates to a glass anti-dust coating composition, which comprises 5.0-50.0 wt% of polyurethane, 40.0-95.0 wt% of nano silica with the particle size of 5-150 nm, 0.02-5.0 wt% of polyfunctional aziridine and 0-30.0 wt% of a friction-resistant agent. The invention also relates to an anti-ash coating dispersion comprising the glass anti-ash coating composition and an article having an anti-ash coating. When the glass soot-resistant coating composition or soot-resistant coating dispersion of the present invention is coated on the surface of glass, a soot-resistant coating which is durable, stain-resistant, and easy to clean can be formed. In particular, when coated on the glass surface of a solar cell applied in a sandy dust environment, the solar cell having the dustproof coating layer formed of the glass dustproof coating composition or the dustproof coating layer dispersion liquid of the present invention can not only maintain a high initial transmittance of sunlight but also improve power generation efficiency, as compared to a solar cell having no dustproof coating layer.
Description
Technical Field
The invention relates to the field of coating compositions and solar power generation, in particular to a glass dustproof coating composition, a dustproof coating dispersion liquid containing the glass dustproof coating composition and an article with a glass dustproof coating, especially a solar cell.
Background
As a renewable energy source, the solar cell has great social and economic benefits. However, surface dust collection is a serious problem in the solar cell industry, and the power generation efficiency of the solar cell is seriously affected. It has been estimated that in dusty environments, such as in catall desert areas, the average monthly efficiency loss due to ash collection is close to 15%, and the efficiency decays to 68% over 234 days without rain and without cleaning; in the chinese market, however, the loss of power generation due to cell surface contamination reaches about $ 30 billion in 2012 only. Therefore, antifouling and anti-dust coatings have a wide market prospect, and it is estimated that the installed solar capacity of China in 2020 reaches 150GW, and the demand for antifouling coatings approaches $ 1 billion.
Although the properties of stain resistance and self-cleaning on glass surfaces have been reported to be achieved with superhydrophilic or superhydrophobic coatings, there are few successful commercial applications. The known self-cleaning coating based on nano silicon oxide has better effects of preventing dust and rainwash and self-cleaning, but the high surface can easily adsorb oily dirt, so that the practical application is limited; for hydrophobic coatings with low surface energy, however, the coatings are often difficult to clean due to poor water spreadability. The photocatalytic coating can solve the problems well theoretically, but the refractive index of the coating is high, and when the photocatalytic coating is applied to the surface of an antireflection coating, the visible light transmittance can be obviously reduced, so that the application range of the photocatalytic coating is limited.
There is therefore a need in the art to develop anti-fouling coatings that are suitable for different environments, especially harsh dust environments.
Disclosure of Invention
In view of the above, as a result of intensive and extensive studies, the present inventors have found a novel soot-resistant coating composition based on a polyurethane/nano-silica composite, which is capable of forming a durable soot-resistant and easily cleaned soot-resistant coating when applied on a glass surface.
Accordingly, in one aspect, the present invention provides a glass soot coating composition comprising:
5.0 to 50.0 wt% of a polyurethane;
40.0 to 95.0 wt% of nano silica, and the particle size of the nano silica is 5 to 150 nm;
0.02 to 5.0 wt% of polyfunctional aziridine; and
0 to 30.0 wt% of a friction-resisting agent,
wherein all amounts are based on the total weight of the glass soot coating composition.
In a preferred embodiment, the polyfunctional aziridine has the structure shown by the following formula:
in a preferred embodiment, the abrasion resistant agent is an alkali metal silicate.
In a preferred embodiment, the alkali metal silicate is lithium silicate or sodium silicate.
In a preferred embodiment, the polyurethane is present in an amount of 10.0 to 40.0 wt.%.
In a preferred embodiment, the content of the nano silica is 60.0 to 90.0 wt%.
In a preferred embodiment, the polyfunctional aziridine is present in an amount of 1.0 to 3.0 wt.%.
In a preferred embodiment, the anti-abrasion agent is contained in an amount of 10.0 to 25.0 wt%.
In a preferred embodiment, the particle size of the nano-silica is 15 to 100 nm.
In another aspect, the present invention provides an anti-ash coating dispersion comprising:
0.5 to 20.0 wt% of the glass anti-dust coating composition; and
80.0 to 99.5 wt% of a solvent,
wherein all amounts are based on the total weight of the glass soot coating dispersion.
In a preferred embodiment, the solvent is water, or a blend of water with an alcohol, ketone, ether or ester.
In another aspect, the present disclosure provides an article comprising:
a glass member; and
an anti-ash coating formed by coating the above glass anti-ash coating composition or the above anti-ash coating dispersion on the outer surface of the glass member.
In a preferred embodiment, the article is a solar cell.
The novel glass soot-resistant coating composition or soot-resistant coating dispersion of the present invention is capable of forming a durable soot-resistant and easy-to-clean soot-resistant coating when applied on a glass surface. In particular, when coated on the glass surface of a solar cell applied in a sandy dust environment, the solar cell having an anti-dust coating formed from the glass anti-dust coating composition or the anti-dust coating dispersion of the present invention not only brings a high initial transmittance of sunlight, but also can maintain a gain of 1 to 6% in the transmittance of sunlight of the cell glass for at least half a year due to its excellent anti-dust easy-to-clean characteristic, thereby improving the power generation efficiency of the solar cell module and realizing a gain of power generation amount of about 1 to 6%, compared to a solar cell having no anti-dust coating or having a conventional anti-reflection coating.
Drawings
FIG. 1 shows a bar graph of the change in light transmittance (Δ T) over time for a glass part without an ash-resistant coating (blank control) and with an ash-resistant coating formed according to the present invention.
Detailed Description
The present invention is based on the following findings: when a coating composition based on polyurethane, nanosilica and polyfunctional aziridines having a specific composition is applied on a glass surface, an anti-dusting coating which is durable against soiling and easy to clean can be formed. In particular, such an anti-dust coating, when applied to solar cells, is not only able to maintain a high initial transmittance of sunlight on glass, but also long-term outdoor application experiments have shown that solar cell modules coated with the anti-dust coating improve the power generation efficiency by about 1-2% relative to modules without such a coating, which can bring about great social and economic benefits in practice.
Specifically, the present invention provides a glass soot-resistant coating composition comprising: polyurethane, nanosilica, polyfunctional aziridine, and optionally an abrasion resistance agent.
As used herein, the polyurethane may be prepared by methods well known in the art, for example, by first polymerizing a polyester diol, a polyether diol, a dimethylolpropionic acid chain extender, and a diisocyanate, such as isophorone diisocyanate, at a temperature, for example, 50-60 ℃ for a time to obtain an isocyanate-terminated polyurethane prepolymer; and dispersing the prepolymer in water to perform chain extension reaction to obtain the waterborne polyurethane emulsion, wherein the prepolymer with the required molecular weight and the final polyurethane can be obtained by controlling relevant parameters of the polymerization process such as the addition ratio of raw materials, particularly the addition amounts of a chain extender and diisocyanate, the polymerization temperature and the polymerization time. In certain embodiments of the present invention, the number average molecular weight of the polyurethane used is preferably 5000 or more, more preferably in the range of 9000 to 150000, from the viewpoint of adhesion of the formed coating layer to a glass substrate. Such polyurethane emulsions are well known in the art and may be aqueous polyurethane emulsions, wherein the polyurethane may be present in an amount of 30 to 50% by weight. One example is an aqueous polyurethane emulsion available under the trade name U9160 from Alberdingkeley GmbH (Oubardi resin, Germany).
In the composition for an anti-ash coating of the present invention, the content of polyurethane is 5.0 to 50.0 wt%, because the anti-ash performance of an anti-ash coating formed from the composition for an anti-ash coating of the present invention becomes poor when the content of polyurethane is more than 50.0 wt%; when the content of the polyurethane is less than 5.0% by weight, a continuous and uniform soot-proof coating layer cannot be formed on the glass surface, and when the content of the polyurethane is too low, the content of the nano silica is inevitably increased, which results in that the haze of the soot-proof coating layer formed is high (H1.4%, and the desired initial haze is about 1.0%). Preferably, in the dustproof coating composition of the present invention, the content of the polyurethane is 10.0 to 40.0 wt%.
As used in the present invention, nanosilica is silica having a nano-scale particle size or an average particle size. In the soot-preventing coating composition of the present invention, the content of nano-silica is preferably 40.0 to 95.0 wt% and preferably 60.0 to 90.0 wt% from the viewpoint of soot-preventing performance and durability because when the content of nano-silica is less than 40.0 wt%, the soot-preventing performance is deteriorated, and when the content of nano-silica is more than 95.0 wt%, the haze of the formed soot-preventing coating is increased, so that the light transmittance of a glass part having the soot-preventing coating is decreased, resulting in a decrease in the efficiency of an article such as a solar cell. Moreover, the nano-silica used in the present invention has a particle size of 5 to 150nm because the anti-ash property of the anti-ash coating formed by the anti-ash coating composition of the present invention is deteriorated when the particle size of the nano-silica is less than 5 nm; when the particle size of the nano silica is more than 150nm, the formed soot-preventing coating is not uniform and the adhesion to the glass surface is deteriorated, failing to form a durable soot-preventing coating. Preferably, in the dust-proof coating composition, the particle size of the nano silicon dioxide is preferably 15-100 nm. In addition, the nano-silica can be provided in the form of an aqueous dispersion or a sol by stirring and mixing with water, wherein the mass content of the silica is 15-50%. As an example, aqueous silica dispersions are commercially available from Nalco company (Nalco Corp.) under the trade names Nalco 1050, Nalco 1115, and Nalco 2329.
In the anti-ash coating composition of the present invention, polyfunctional aziridine means a compound containing two or more aziridine groups, which functions as a crosslinking agent and plays a crosslinking role in forming an anti-ash coating on a glass surface. In the composition of the present invention, the polyfunctional aziridine is contained in an amount of 0.02 to 5.0% by weight, because when the content is less than 0.02% by weight, crosslinking cannot be effected; and when the content is more than 5.0% by weight, the ash preventing property of the formed ash preventing coating layer may be deteriorated. Preferably, in the composition for an anti-ash coating of the present invention, the polyfunctional aziridine is contained in an amount of 1.0 to 3.0 wt%. Such polyfunctional aziridine crosslinking agents are common in the art, and are commercially available, for example, from DSM Company (Dismana Prada synthetic resins (Foshan) Co., Ltd.) under the trade designation CX-100, having the structure shown below:
as used in the present invention, abrasion resistant agents are known in the art and function to improve the abrasion resistance of the formed ash resistant coating to resist abrasion such as during glass cleaning in certain harsh use environments. In the dustproof coating composition of the present invention, it is preferable that a friction-resistant agent is contained, but the content thereof is preferably not more than 30.0 wt% because when the content thereof exceeds 30.0 wt%, it causes the formation of a dustproof coating layer to be non-uniform and the dustproof property to be degraded. Preferably, in the dustproof coating composition of the present invention, the content of the abrasion resistant agent is 10.0 to 25.0 wt%. The friction-resisting agent used in the present invention is preferably an alkali metal silicate such as lithium silicate or sodium silicate or the like from the viewpoint of ash-proof property and improvement of wear resistance. Such a friction resistant agent is generally available as an aqueous solution thereof, such as a lithium silicate solution available under the trade name LSS75 from Nissan chemical industries Ltd.
On the other hand, for practical use, the glass dustproof coating composition of the present invention is generally provided in the form of a dispersion thereof obtained by dispersing in a solvent, and optionally adding a surfactant and/or an emulsifier. To this end, the present invention provides an anti-ash coating dispersion comprising the glass anti-ash coating composition of the present invention and a solvent.
In the dispersion for an anti-ash coating of the present invention, the content of the glass anti-ash coating composition is 0.5 to 20.0 wt%, because when the content is less than 0.5 wt% or more than 20.0 wt%, the anti-ash coating formed using the dispersion is not uniform and the thickness of the formed anti-ash coating is insufficient or too thick. The thickness of the coating depends on the requirements for the grey protection, appearance and coating bonding of the article, e.g. a solar cell, and a person skilled in the art can select a suitable thickness according to the actual need on the basis of the present invention. The coating is too thin, and the required dust-proof and stain-resistant effects can not be achieved; the coating is too thick, tends to be unevenly coated and to have poor adhesion to glass. In the present invention, when the content of the glass soot-preventing coating composition is in the above-mentioned range of 0.5 to 20.0 wt%, an ideal soot-preventing coating thickness of 20 to 2000nm can be obtained. Further, the thickness of the formed anti-dust coating layer is preferably 100 to 500nm from the viewpoints of anti-dust performance, haze and light transmittance.
In the graying-resistant coating dispersion of the present invention, the solvent used is preferably water, or a blend of water and an alcohol, ketone, ether or ester, examples of which are methanol or ethanol, acetone, diethyl ether or ethyl acetate, preferably an alcohol, ketone, ether or ester miscible with water. The content of the solvent in the dispersion is not particularly limited, and depends on the content of the glass soot coating composition in the dispersion. Preferably, the content of the solvent is preferably 80.0 to 99.5% by weight in view of the content of the glass soot coating composition in the dispersion being 0.5 to 20.0% by weight.
In the dispersion for an anti-ash coating of the present invention, suitable conventional additives such as a surfactant, an emulsifier, a wetting agent, a thickener and the like may be further included as necessary to further improve the convenience of forming an anti-ash coating using the dispersion and to improve the anti-ash property and adhesion of the formed anti-ash coating. Conventional additives which can be used in the present invention are well known to those skilled in the art, and the content thereof is preferably in the range of 0 to 15.0 wt% in general.
The glass anti-ash coating composition or the anti-ash coating dispersion of the present invention is mainly applied to articles or devices having glass members requiring anti-fouling, anti-ash, wherein the anti-ash coating composition or the coating dispersion of the present invention is coated on the outer surface of the glass member by a suitable means such as brushing to form an anti-ash coating layer, thereby achieving anti-ash and anti-fouling of the articles while not significantly affecting light transmittance. Accordingly, in another aspect, the present invention provides an article comprising a glass part and an anti-ash coating formed by applying the glass anti-ash coating composition or the anti-ash coating dispersion of the present invention on an outer surface of the glass part. Preferably, the article is preferably a solar cell or solar cell module.
Prior to application of the composition or dispersion of the present invention, the glass surface to be coated is preferably suitably pretreated to remove dust or other contaminants on the surface that may affect the adhesion or uniformity between the dust-resistant coating and the glass surface. It is to be noted here that the glass surface to be coated with the soot-preventing coating composition or dispersion according to the invention may be a completely blank or new glass surface (i.e. without any further coating or cladding prior to coating) or may be a glass surface already provided with some kind of existing or conventional coating or cladding, e.g. the glass part may be a glass part already provided with a antireflective coating or an existing soot-preventing coating, and the soot-preventing coating composition or dispersion according to the invention may be directly applied to a new glass surface or directly onto an existing coating or cladding of the glass part, as well as being able to achieve the soot-preventing and stain-preventing effects according to the invention. From the viewpoint of durability and cost, it is preferable to apply the dustproof coating composition or dispersion of the present invention directly to the surface of a bare glass member which is not coated with any coating layer.
The coating method of the present invention is not particularly limited, and can be carried out by various conventional methods including wire bar coating, roll coating, curtain coating, mesh roll coating, spray coating, dip coating, etc., and then dried and cured at room temperature or under heating to form a coating layer. For example, the desired coating may be formed on the glass surface by roll coating and oven drying at about 120 ℃ to cure.
Examples
The present invention will be described in more detail with reference to the following examples and drawings, but it should be noted that the present invention is not limited to these examples. Unless otherwise indicated, all parts, ratios, and percentages in the following examples and comparative examples are by weight, the experimental methods used are conventional in the art, and the reaction equipment, materials, and reagents used are commercially available.
Some of the raw materials and sources used in the examples and comparative examples are listed below:
preparation of coating liquid: the polyurethane emulsion, the aqueous silica dispersion and the polyfunctional aziridine crosslinking agent, and optionally the anti-friction agent (such as an aqueous lithium silicate solution) are uniformly stirred in deionized water according to a certain proportion by using a stirring rod or a magnetic stirring device, so that the coating liquid with a certain solid content (namely the content of the dustproof coating composition) can be obtained.
Preparation of a test sample: a portion of the glass sample was uniformly coated with the coating liquid on one half surface of the blank glass using a 6 μm wire bar, while the other half surface of the glass was left uncoated blank glass for use as a control. Another part of the glass sample was double coated by dip coating (pull rate 100 mm/min). All prepared glass samples were left at ambient temperature for 24 hours before testing.
Test method
Light transmittance and haze test
The anti-fouling performance of the dried coatings was evaluated by measuring the light transmittance and haze of the test samples before and after the dry dust test. Light transmittance and HAZE measurements were made according to ASTM D1003-13 using a transparence meter (BYK HAZE-GARD PLUS, available from BYK-Gardner). Five measurements were taken for different areas of each sample surface and the average of these five measurements was recorded.
Dry dust test
Samples (uncoated, half-coated or fully coated glass panels) were exposed to Arizona Test Dust (0 to 70 μm, available from Powder Technology corporation) maintained at 10% relative humidity.
The sample is placed in a horizontal position with the side to be tested facing up into a polypropylene container (Ultra-Seal) with a snap-on topTM23.2cm in length, 16.8cm in width, 6.4cm in height, 1.4 liter capacity, available from steralite) into which 1000g of fresh arizona has been previously placedThat tests for dust. The container was buckled and then gently shaken back and forth at a fixed frequency of 1 time per second for 1 minute to allow the dust to move across the surface of the sample. The cap was then removed and the sample removed from the dust and shaken gently once.
For transparent substrates such as glass, the stain resistance of the coating is typically characterized by an increase in haze Δ H and a decrease in light transmission Δ T after testing:
ΔH＝H1-H0in which H is1For haze after test, H0Is haze before testing. If Δ H<3% of the total amount of the coating, the coating is considered to have good stain resistance (bare glass Δ H)>10％)；
ΔT＝T0-T1Wherein T1 is the transmittance after the test, and T0 is the transmittance before the test. If Δ T<1%, the coating is considered to have better stain resistance.
Abrasion resistance test
Using a cockcloth of cockcloth1000, a load of 750g, 100 cycles of rubbing on a cockmeter CM-5(SDL Atlas Linear Friction Meter), the surface was rinsed of debris with deionized water and visually inspected for abrasion.
Surface wetting Performance test
The surface wetting properties of the coatings were characterized by the contact angle. The instrument for testing surface wettability was a KrussDSA100 automatic contact angle tester, available from Kruss corporation. 5 microliter drops of water were dropped onto the substrate surface and the contact angle was tested until the drop shape no longer changed. The contact angles were measured in any of three different areas of the surface, and the average value was taken.
Site testing
The coating solution was sprayed onto 3 solar glass samples of 300mm by 300mm, all samples were dried at ambient temperature for at least 24 hours. The field test was performed in Turpan, Xinjiang, with the samples washed once a month with water, the transmittance was measured before each wash, and the average value of the transmittance drop Δ T was recorded and compared to the blank glass Δ T.
Δ T-T1-T0 (T0: initial light transmittance before field test;% T1: light transmittance after field test)
In the following examples 1 to 4, nanosilica having a particle size of 20nm was used, and in example 5, nanosilica having a particle size of 75nm was used. The coating composition of comparative example 1 contained too much (about 58%) of polyurethane, the coating composition of comparative example 2 used nano silica having a small particle size (4 nm), and the coating composition of comparative example 3 used polyurethane having too little (about 3.3%).
Example 1
A250 ml glass bottle was charged with 7.1g U9160 polyurethane emulsion, 5g of aqueous Nalco 1050 silica dispersion, 188g of deionized water, and 0.1g of CX-100 polyfunctional aziridine crosslinking agent, and stirred for 30 minutes to obtain a coating solution having a solid content of 5%.
Example 2
A250 ml glass bottle was charged with 4.3g U9160 polyurethane emulsion, 7g aqueous Nalco 1050 silica dispersion, 189g deionized water and 0.06g CX-100 polyfunctional aziridine crosslinking agent, and stirred for 30 minutes to obtain a coating solution having a solid content of 5%.
Example 3
A2000 ml glass bottle was charged with 14.5g U9160 polyurethane emulsion, 22.4g aqueous Nalco 1050 silica dispersion, 14.5g aqueous LSS-75 lithium silicate solution, 946.3g deionized water and 0.64g CX-100 polyfunctional aziridine crosslinking agent, and stirred for 30 minutes to obtain a coating solution having a solid content of 2%.
Example 4
A20 ml glass bottle was charged with 0.1g U9160 polyurethane emulsion, 0.26g of aqueous Nalco 1050 silica dispersion, 0.15g of aqueous LSS-75 lithium silicate solution, 9.5g of deionized water, and 0.06g of aqueous 10% CX-100 polyfunctional aziridine crosslinking agent dispersion, and stirred for 30 minutes to obtain a coating solution having a solid content of 2%.
Example 5
A20 ml glass bottle was charged with 0.15g U9160 polyurethane emulsion, 0.29g of aqueous dispersion of Nalco 2329 silica, 0.15g of aqueous solution of LSS-75 lithium silicate, 9.4g of deionized water, and 0.06g of aqueous dispersion of 10% CX-100 polyfunctional aziridine crosslinking agent, and stirred for 30 minutes to give a coating solution having a solid content of 2%.
Comparative example 1
A250 ml glass bottle was charged with 10g U9160 polyurethane emulsion, 3g of aqueous Nalco 1050 silica dispersion, 187g of deionized water, and 0.14g of CX-100 polyfunctional aziridine crosslinking agent, and stirred for 30 minutes to obtain a coating solution having a solid content of 5%.
Comparative example 2
A20 ml glass bottle was charged with 0.15g U9160 polyurethane emulsion, 0.72g of Nalco 1115 silica aqueous dispersion, 0.15g of LSS-75 lithium silicate aqueous solution, 8.6g of deionized water, and 0.06g of 10% CX-100 polyfunctional aziridine crosslinking agent aqueous dispersion, and stirred for 30 minutes to obtain a coating solution having a solid content of 2%.
Comparative example 3
A20 ml glass bottle was charged with 0.05g U9160 polyurethane emulsion, 0.98g aqueous dispersion of Nalco 1050 silica, 8.98g deionized water, and 0.03g aqueous dispersion of 10% CX-100 polyfunctional aziridine crosslinking agent, and stirred for 30 minutes to obtain a coating solution having a solid content of 5%.
The coating liquids prepared in each of examples 1 to 5 and comparative examples 1 to 3 described above were used to prepare test samples according to the test sample preparation process (in which examples 1 to 2 were double-side dip-coated and examples 3 to 5 and comparative examples 1 to 3 were single-side coated) and initial haze, haze increase value Δ H after gray exposure and reduction value Δ T of light transmittance, dry friction property test and water contact angle test were performed. Further, the test samples prepared using the coating liquids of example 3 were subjected to field tests in the region of Turpan, Xinjiang, and the results are shown in Table 1 and FIG. 1, respectively.
As can be seen from the results shown in Table 1, examples 1 to 5, in which the coating composition using 5.0 to 50.0 wt% of Polyurethane (PU), 40.0 to 95.0 wt% of nano-silica having a particle size of 5 to 150nm, and 0.02 to 5.0 wt% of polyfunctional aziridine, all exhibited excellent gray resistance, and, after gray contact based on a single-sided coating, the light transmittance decreased by less than 0.5% while the haze increased by less than 1.5% (note: in Table 1, examples 1 to 2 are data obtained by double-sided dip coating, and examples 3 to 5 are data obtained by single-sided coating). However, when the content of the polyurethane component is too high (comparative example 1), the content of the polyurethane is too low (comparative example 3), or the nanometerSiO2When the particle diameter of the particles is too small (comparative example 2), the ash preventing properties such as Δ H and Δ T may be deteriorated, failing to achieve the desired effects.
In addition, compared to examples 1-2 and comparative examples 1 and 3, in which no friction resistance agent such as lithium silicate was used, lithium silicate added as a friction resistance agent in a proper amount can resist abrasion of the clean-in-place glass, i.e., the abrasion resistance of the coating can be significantly improved.
Furthermore, as presented in table 1, the contact angle of the water drop of example 3 is 31.3 °, indicating that the anti-dust coating of the present invention has a certain hydrophilicity.
In addition, fig. 1 shows the results of field measurements for five months (Δ T is a decrease in light transmittance compared to an initial value) performed at a solar power station in the Turpan area of Xinjiang. It is well known that the Turpan area in Xinjiang represents a typical windy, dusty climate environment in the desert area in the northwest of China. However, as can be seen from the results shown in FIG. 1, the glass having the anti-soot coating according to the present invention has a light transmittance gain of 1-6% per month, compared to the uncoated blank glass, and thus a corresponding power generation output gain can also be achieved.
Although specific embodiments of the invention have been described in detail, those skilled in the art will appreciate. Various modifications and substitutions of those details may be made in light of the overall teachings of the disclosure, and such changes are intended to be within the scope of the present invention. The full scope of the invention is given by the appended claims and any equivalents thereof.
Claims (13)
1. A glass soot-resistant coating composition comprising:
5.0 to 50.0 wt% of a polyurethane;
40.0 to 95.0 wt% of nano silica, and the particle size of the nano silica is 5 to 150 nm;
0.02 to 5.0 wt% of polyfunctional aziridine; and
0 to 30.0 wt% of a friction-resisting agent,
wherein all amounts are based on the total weight of the glass soot coating composition.
2. The glass soot coating composition of claim 1, wherein said polyfunctional aziridine has a structure according to the following formula:
3. the glass soot coating composition of claim 1, wherein said abrasion resistant agent is an alkali metal silicate.
4. The glass soot coating composition of claim 3, wherein said alkali metal silicate is lithium silicate or sodium silicate.
5. The glass soot coating composition of claim 1, wherein said polyurethane is present in an amount of 10.0 to 40.0 wt.%.
6. The glass soot coating composition of claim 1, wherein said nano silica is present in an amount of 60.0 to 90.0 wt.%.
7. The glass anti-ash coating composition of claim 1, wherein the polyfunctional aziridine is present in an amount of 1.0 to 3.0 wt.%.
8. The glass soot coating composition of claim 1, wherein said abrasion resistant agent is present in an amount of 10.0 to 25.0 wt.%.
9. The glass soot coating composition of claim 1, wherein said nano silica has a particle size of 15 to 100 nm.
10. An anti-ash coating dispersion comprising:
0.5 to 20.0 wt% of the glass anti-ash coating composition according to any one of claims 1 to 9; and
80.0 to 99.5 wt% of a solvent,
wherein all amounts are based on the total weight of the glass soot coating dispersion.
11. The ash control coating dispersion of claim 10 wherein the solvent is water or a blend of water with an alcohol, ketone, ether or ester.
12. An article of manufacture, comprising:
a glass member; and
an anti-ash coating formed by coating the glass anti-ash coating composition according to any one of claims 1 to 9 or the anti-ash coating dispersion according to any one of claims 10 to 11 on the outer surface of the glass member.
13. The article of claim 12, wherein the article is a solar cell.
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